53rd week of 2009 patent applcation highlights part 21 |
Patent application number | Title | Published |
20090322177 | ELECTROMAGNETIC ACTUATOR - An electromagnetic actuator for generating rotary motion, the actuator comprising an armature assembly and a stator assembly, the armature assembly having a plurality of magnets arranged in a ring shape, and a stator assembly comprising an electromagnet and at least on currently carrying conductor preferably arranged in a coiled configuration such that energisation of the coil causes the electromagnet to become active, and further comprising a shaft rotatable relative to the stator housing and with the armature assembly when the coil is energised. | 2009-12-31 |
20090322178 | COIL WIRE FOR COIL ASSEMBLY FOR ROTARY ELECTRICAL MACHINE - A coil wire for a coil assembly of a rotating electrical machine is provided such that sufficient space in braiding is secured when coil-wire-bundles bundling a plurality of the coil wires are braided. | 2009-12-31 |
20090322179 | STATOR FOR AN ELECTRICAL MACHINE - The invention describes a stator for an electrical machine, in particular a universal motor, comprising a stator core ( | 2009-12-31 |
20090322180 | ROTARY ELECTRIC MOTOR - A rotary electric motor includes a cylindrical rotor having an outer peripheral side, a stator provided to surround the outer peripheral side of the rotor with a gap between the stator and the rotor, and a load side bracket having a recess and provided on a load side of the stator. The stator includes stator coils and a stator core having teeth portions around which the stator coils are wound. A load side coil end of each of the stator coils protrudes from a load side end face of the stator core. At least two of an inner peripheral surface, an outer peripheral surface, and an end face of the load side coil end contact an inner surface of the recess via an insulator. | 2009-12-31 |
20090322181 | ULTRASONIC TRANSDUCER AND METHOD OF MANUFACTURING THE SAME - A technique for a capacitive micromachined ultrasonic transducer (CMUT) for achieving high transmitted sound pressure and high receiver sensitivity is provided. An opening portion ( | 2009-12-31 |
20090322182 | Electromechanical Actuators - Apparatus including layer of polarizable material located between first and second electrodes. Polarizable material has block copolymeric composition including elastomeric domain blocks and conductive domain blocks. Method that includes providing layer of polarizable material having block copolymeric composition including elastomeric domain blocks and conductive domain blocks, first and second electrodes being on opposite surfaces of the layer. Method also includes applying voltage differential between electrodes, causing dimension of layer to change. | 2009-12-31 |
20090322183 | INERTIAL SENSOR AND INERTIAL DETECTING DEVICE - An inertial sensor includes a first beam, a first proof mass section and a first upper surface stopper section. The first beam extends in a first direction in a plane parallel to a major surface of a substrate and is held with a spacing from the major surface of the substrate. The first beam has a first detecting section including a first upper side electrode, a first lower side electrode, and a first upper side piezoelectric film provided between the first upper side electrode and the first lower side electrode. The first beam has one end connected to the major surface of the substrate. The first proof mass section is connected to the other end of the first beam and held with a spacing from the major surface of the substrate. The first upper surface stopper section is provided on the opposite side of the first proof mass section from the substrate with a spacing from the first proof mass section. | 2009-12-31 |
20090322184 | Energy Harvesting Using Frequency Rectification - An energy harvesting apparatus includes an inverse frequency rectifier structured to receive mechanical energy at a first frequency, and a solid state electromechanical transducer coupled to the inverse frequency rectifier t receive a force provided by the inverse frequency rectifier. The force, when provided by the inverse frequency rectifier, causes the solid state transducer to be subjected to a second frequency that is higher than the first frequency to thereby generate electrical power. | 2009-12-31 |
20090322185 | PIEZOELECTRIC RESONANT POWER GENERATOR - A method for generating power in a wellbore includes moving an actuator; inducing an oscillating stress on a piezoelectric component with the actuator; and generating a voltage with the piezoelectric component in response to the induced stress on the piezoelectric component. | 2009-12-31 |
20090322186 | THIN FILM PIEZOELECTRIC RESONATOR AND METHOD FOR MANUFACTURING THE SAME - A thin film piezoelectric resonator suppresses deterioration of impedance at antiresonant frequency and has a high Q value. The thin film piezoelectric resonator is provided with a semiconductor substrate ( | 2009-12-31 |
20090322187 | Piezoelectric Actuators - Microelectromechanical systems with structures having piezoelectric actuators are described. The structures each have a body that supports piezoelectric islands. The piezoelectric islands have a first surface and a second opposite surface. The piezoelectric islands can be formed, in part, by forming cuts into a thick layer of piezoelectric material, attaching the cut piezoelectric layer to a body having etched features and grinding the piezoelectric layer to a thickness that is less than the depths of the cuts. Conductive material can be formed on the piezoelectric layer to form electrodes. | 2009-12-31 |
20090322188 | SMALL-SIZED MOTOR - The present invention is used with a stopper mechanism for mechanically stopping the rotation of a motor. A pair of brushes is disposed such that a line which passes through the center of a rotor and connects the centers of the paired brushes is offset by a predetermined angle from a line which connects the centers of paired magnets. A commutator is disposed in such a manner as to be offset from a reference position by the same angle as the predetermined angle by which the paired brushes are offset. The predetermined angle falls within a range between an angle obtained by dividing 70° by the number of pairs of stator poles and an angle obtained by dividing 290° by the number of pairs of stator poles. Specifically, in the case of two stator poles, the predetermined angle falls within a range of 70° to 290° inclusive. In the case of four stator poles, the predetermined angle falls within a range of 35° to 145° inclusive. | 2009-12-31 |
20090322189 | System for collecting stray energy - A converter system for generating electrical signal from an optical signal utilizes a collector for collecting an energy source as an optical signal. The collected optical signal is transmitted to a receiver which is associated with a converter for converting the optical signal to an electric signal. In one embodiment the converter system is incorporated in an electric motor of the type having a housing, a rotating shaft mounted in the housing, a commutator on the shaft, and a pair of permanent magnets, whereby the shaft is rotated in response to electrical power being applied to the commutator. The system includes an optical collector mounted in the housing in non-interfering relationship with the commutator and the shaft, whereby the optical collector is adapted for generating an optical signal from the stray energy in the motor housing when power is applied to the motor and the shaft is rotating. The optical signal thus generated is transmitted to the receiver. | 2009-12-31 |
20090322190 | TOOTHBRUSH STERILIZER - A toothbrush sterilizer includes a housing having an opening. A door opens and closes the opening. A sterilization element sterilizes a toothbrush. A toothbrush holding portion holds the toothbrush. The sterilization element and the toothbrush holding portion are accommodated in the housing. The toothbrush holding portion moves out of the housing through the opening in cooperation with an opening operation of the door. Further, the toothbrush holding portion moves into the housing through the opening in cooperation with a closing operation of the door. | 2009-12-31 |
20090322191 | COVER LATCHING MECHANISM FOR ELECTRONIC DEVICE - A cover latching mechanism for an electronic device includes a housing and a cover slidably mounted with the housing. The housing has a latching member and at least one limiting member. The cover has a cover body and a guiding rail formed on the cover body. The guiding rail is slidably mounted with the latching member. The limiting member is for preventing the guiding rail sliding apart from the housing. | 2009-12-31 |
20090322192 | AERODYNAMIC STRUCTURAL SAFETY BARRIER DESIGN - A barrier disposed within a computer housing includes a frame adapted to be secured to the computer housing; and a plurality of elongated members attached to the frame. The plurality of elongated members are disposed across the frame such that the plurality of elongated members are attached to an inner surface of the frame. The barrier defines separate compartments within the computer housing and at least one fan is disposed in a compartment separated by the barrier from another compartment in which at least one electronic component is disposed. A method of manufacturing a barrier includes providing a frame; attaching a plurality of elongated members to the frame; disposing the frame within the housing such that the frame defines separate compartments within the housing; disposing at least one fan in a compartment separated by the barrier from another compartment; and disposing at least one electronic component in the another compartment. | 2009-12-31 |
20090322193 | Electronic apparatus - An electronic apparatus includes a first housing that has a shape of a rectangle a second housing, and a connecting section that movably connects the first housing to the second housing. The first housing is formed of at least a first part that is attached to the second housing by the connecting section and forms one side of the rectangle and a second part that is bonded to the first part at a position closer to the one side, and an attaching surface of the first part and the second part has an attaching area that changes from both ends of the one side to the center thereof. | 2009-12-31 |
20090322194 | SAFETY CABINET WITH DRAWER - A safety cabinet has a sturdy box having an open front side and a door hinged to the box and movable between a closed position fitting against the box and closing the front side and an open position pivoted out from the box and exposing the open front side. A shelf can slide in the open position of the door between an in position wholly contained in the box behind the open front side and an out position projecting forward at least partially from the open front side. An arm connected between the door and the shelf moves the shelf into the out position when the door is moved respectively into the open position and into the in position when the door is moved into the closed position. | 2009-12-31 |
20090322195 | Additive Dispenser Drawer Assembly - An additive dispenser drawer includes roller assemblies located on opposite sides near a rear portion of the dispenser drawer. Each roller assembly moves within a guide rail attached to a side of a housing. Bearing fixtures are attached to the housing near the front and act upon surfaces of the dispenser drawer. | 2009-12-31 |
20090322196 | REFRIGERATOR AND RAIL ASSEMBLY THEREOF - In a rail assembly structure according to an embodiment of the present invention, a shaking prevention member preventing the shaking of a storage container is provided at a position lower than a rail member so that the upper volume and the lower volume of the storage container received in the storage space of the refrigerator is increased as compared to the conventional refrigerator. | 2009-12-31 |
20090322197 | LIGHT EMITTING DEVICE HAVING A TRANSPARENT THERMALLY CONDUCTIVE LAYER - A light emitting device and method of producing the same is disclosed. The light emitting device includes a transparent thermally conductive layer, a phosphor layer provided on the transparent thermally conductive layer, and at least one light emitting semiconductor arranged to emit light toward the transparent thermally conductive layer and the phosphor layer. | 2009-12-31 |
20090322198 | METHOD OF PRODUCING SPARK PLUG AND SPARK PLUG PRODUCED BY THE METHOD - For producing a spark plug that has a high dimensional accuracy in the spark gap, a method is disclosed which comprises (a) preparing a semi-finished spark plug unit ( | 2009-12-31 |
20090322199 | BACKSIDE MOUNTED ELECTRODE CARRIERS AND ASSEMBLIES INCORPORATING THE SAME - A carrier assembly is provided comprising a backside mounted electrode carrier and electrode mounting hardware. The backside mounted electrode carrier comprises an electrode accommodating aperture, which in turn comprises a sidewall structure that is configured to limit lateral movement of an electrode positioned in the aperture. The electrode accommodating aperture further comprises one or more sidewall projections that support the weight of an electrode positioned in the aperture. The electrode mounting hardware is configured to engage an electrode positioned in the electrode accommodating aperture from the backside of the carrier and urge the electrode against the sidewall projections so as to limit axial movement of the electrode in the electrode accommodating aperture. Additional embodiments of broader and narrower scope are contemplated. | 2009-12-31 |
20090322200 | Nano Filament Structure and Methods of Forming the Same - Provided are a nano filament structure and a method of forming the nano filament structure. The nano filament structure includes a first layer disposed on a substrate, a second layer having a gap of nanometer size disposed on the first layer, a catalyst layer interposed between the first layer and the second layer, and a nano filament. One end of the nano filament is in contact with the catalyst layer and grows by penetrating the gap of the second layer | 2009-12-31 |
20090322201 | UV GENERATED VISIBLE LIGHT SOURCE - A device and method for an ultraviolet light (UV) light based visible light generator is disclosed. The UV light source emits a beam of UV light that may be scattered onto surfaces including UV light reactive materials that produces visible light when excited by the scattered UV light. The UV light may be coherent or non-coherent light. | 2009-12-31 |
20090322202 | SUBSTANTIALLY FLAT LUMINOUS AND/OR UV STRUCTURE - A flat or substantially flat light-emitting and/or UV (ultraviolet)-emitting structure including first and second dielectric walls facing each other and defining an internal space containing a light source, first and second electrodes for the light source, which generate electric field lines with at least one component perpendicular to the first and second electrodes, the first electrode being supplied or capable of being supplied by a high-frequency electromagnetic signal f | 2009-12-31 |
20090322203 | PLASMA DISPLAY PANEL - A plasma display panel (PDP) is made of front panel ( | 2009-12-31 |
20090322204 | COLD CATHODE FLUORESCENT LAMP AND MANUFACTURING METHOD THEREOF - A method for manufacturing a cold cathode fluorescent lamp (CCFL) is disclosed. The CCFL includes a light transmitting shell and an electrode disposed at one end of the light transmitting shell. The method includes the steps of exhausting a gas existing inside the light transmitting shell via a vent of the light transmitting shell, charging at least one inert gas into the light transmitting shell, and removing an amalgam, which is initially disposed in a gas adjusting instrument, into a temporal region of the light transmitting shell after the step of exhausting. | 2009-12-31 |
20090322205 | METHODS AND APPARATUSES FOR ENHANCING HEAT DISSIPATION FROM A LIGHT EMITTING DEVICE - A light emitting device and method of producing the same is disclosed. The light emitting device includes a phosphor layer and a wire mesh thermally coupled to the phosphor layer and configured to dissipate heat from the phosphor layer. | 2009-12-31 |
20090322206 | ELECTRON-EMITTING DEVICE, METHOD OF MANUFACTURING THE SAME, ELECTRON SOURCE, AND IMAGE DISPLAY APPARATUS - Provided is an electron-emitting device which is excellent in electron-emitting efficiency, and may obtain a large electron-emitting amount and stable electron-emitting characteristics. The electron-emitting device includes: a first conductive film and a second conductive film which are provided through a first gap; first carbon films connected to the first conductive film; and second carbon films which are connected to the second conductive film, and are opposed to the first carbon films through second and third gaps. Continuous concave portions are provided in the second and third gaps. | 2009-12-31 |
20090322207 | LIGHT-EMITTING SCREEN AND IMAGE DISPLAYING APPARATUS - To prevent deterioration of an image based on a halation phenomenon due to secondary reflected electrons at the top of a rib member provided between light-emitting members for interrupting reflected electrons, an aperture portion for capturing the secondary reflected electrons is provided at a portion, positioned between the light-emitting members, on the rib member for separating the light-emitting members. | 2009-12-31 |
20090322208 | LIGHT EMITTING DEVICE HAVING A REFRACTORY PHOSPHOR LAYER - A light emitting device and method of producing the same is disclosed. The light emitting device includes a transparent thermal conductor layer, a refractory phosphor layer provided on the transparent thermal conductor layer, and a light emitting semiconductor arranged to emit light toward the transparent thermal conductor layer and the refractory phosphor layer. | 2009-12-31 |
20090322209 | Luminescent Substance of the Class of Nitride Silicates and Light Source Having such a Luminescent Substance - A phosphor from the class of nitridosilicates from the M-Al—Si—N system, comprising a cation M, wherein M is represented by Ca alone or is represented by a mixture of Ca with at least one further element from the group Ba, Sr, Mg, Zn, Cd, Li, Na, Cu, wherein the phosphor is activated with at least one element from the group Eu, Ce which partly replaces M, characterized in that the phosphor forms a phase that is to be assigned to the system M3N2-AlN-Si3N4, wherein the atomic ratio of the constituents M:Al ≧0.375 and the atomic ratio Si/Al ≧1.4. | 2009-12-31 |
20090322210 | Organic electroluminescent element substrate, and organic electroluminescent element and the manufacturing method - The present invention is directed to an organic electroluminescent element of good display characteristic without being contaminated with air in the case that a sealing substrate is affixed to an entire surface of the effective pixels of an organic electroluminescent element substrate by an adhesive. An organic electroluminescent element substrate includes a substrate, pixel electrodes formed over the substrate, an organic luminescence medium layer including an organic luminescent layer on the pixel electrodes which emits different color light, and opposed electrodes wherein the organic luminescence medium layer is between the pixel electrodes and the opposed electrodes, wherein the organic electroluminescent element substrate has partition wall(s), and wherein difference of height in effective pixels of the organic electroluminescent element substrate is less than 1 μm. | 2009-12-31 |
20090322211 | Light-Emitting Material, Light-Emitting Device, and Electronic Apparatus - It is an object to provide a light-emitting material that does not easily deteriorate. It is another object to provide a light-emitting device having superiority in reliability. It is found that a light-emitting material that has superiority in a carrier-transporting property and does not easily deteriorate can be obtained by introducing a substituent that makes oxygen to be not easily added to an anthracene derivative. By using such a light-emitting material, a light-emitting device having superiority in reliability can be obtained. | 2009-12-31 |
20090322212 | SYNTHESIS OF NEW ORGANIC MATERIAL FOR POLYMERIC LIGHT EMITTING DIODE - New, highly photoluminescent compounds are described having structural formula (I) | 2009-12-31 |
20090322213 | Opto-Electrical Polymers and Devices - A polymer for use in an opto-electrical device comprising aromatically conjugated repeat units of optionally substituted 9,9-dimethylfluorene. | 2009-12-31 |
20090322214 | Organic light emitting diode display and method of manufacturing the same - An organic light emitting diode (OLED) display and a method of manufacturing the same are provided. The OLED display includes: a display panel assembly including a first substrate having a display area and a mounting area, a second substrate coupled to the display area of the first substrate, and an integrated circuit chip mounted in the mounting area of the first substrate; a cover window disposed opposite the second substrate and the integrated circuit chip and covering the display panel assembly; and an adhesive layer which fills up a space between the second substrate and the cover window, and a space between the mounting area of the first substrate and the cover window. | 2009-12-31 |
20090322215 | ORGANIC LIGHT EMITTING DEVICE, METHOD OF MANUFACTURING THE SAME, AND SHADOW MASK THEREFOR - The present invention relates to an organic light emitting device, and the organic light emitting device according to an exemplary embodiment of the present invention includes a blue subpixel that is larger than a red subpixel and a green subpixel. The red subpixel and the green subpixel have the same layered structure such that the red subpixel and the green subpixel are formed by using the same shadow mask. | 2009-12-31 |
20090322216 | DISPLAY DEVICE, DISPLAY DEVICE MANUFACTURING METHOD AND DISPLAY METHOD - A display device includes: a plurality of first pixel electrodes which are arranged in a first direction and a second direction intersecting the first direction; a plurality of second pixel electrodes which are arranged in the first and second directions; a counter electrode which is formed to be opposed to the plurality of first pixel electrodes and the plurality of second pixel electrodes; a first power supply line which electrically connects the plurality of first pixel electrodes; and a second power supply line which electrically connects the plurality of second pixel electrodes. One or more pixels are formed to correspond to the respective pixel electrodes of the plurality of first pixel electrodes and the plurality of second pixel electrodes. A light-emitting layer made of an organic light-emitting material or an insulating layer made of an organic compound is disposed between a first electrode which is one of the plurality of first pixel electrodes and the counter electrode and between a second electrode which is one of the plurality of second pixel electrodes and the counter electrode. Power is supplied to the plurality of first pixel electrodes via the first power supply line upon displaying a first image and power is supplied to the plurality of second pixel electrodes via the second power supply line upon displaying a second image. | 2009-12-31 |
20090322217 | ORGANOMETALLIC COMPLEX, AND LIGHTING APPARATUS, AND ELECTRONIC DEVICE USING THE ORGANOMETALLIC COMPLEX - Disclosed are an organometallic complex emitting red light with high color purity. An organometallic complex having a structure represented by the following general formula (G1) is provided. | 2009-12-31 |
20090322218 | One-Step Synthesis and Patterning of Aligned Polymer Nanowires on a Substrate - In a method of making a polymer structure on a substrate a layer of a first polymer, having a horizontal top surface, is applied to a surface of the substrate. An area of the top surface of the polymer is manipulated to create an uneven feature that is plasma etched to remove a first portion from the layer of the first polymer thereby leaving the polymer structure extending therefrom. A light emitting structure includes a conductive substrate from which an elongated nanostructure of a first polymer extends. A second polymer coating is disposed about the nanostructure and includes a second polymer, which includes a material such that a band gap exists between the second polymer coating and the elongated nanostructure. A conductive material coats the second polymer coating. The light emitting structure emits light when a voltage is applied between the conductive substrate and the conductive coating. | 2009-12-31 |
20090322219 | DONOR FILMS IWTH PATTERN-DIRECTING LAYERS - Laser induced thermal imaging (LITI) donor films, and methods of preparing them, having a substrate, a light-to-heat conversion layer, and a pattern-directing layer. The pattern-directing layer can include patterns of self-assembled monolayer regions, hydrophilic and hydrophobic regions, positively or negatively charged regions, or a series of raised or recessed features. It can also be used to generate charge patterns and magnetic patterns. The pattern-directing layer causes patterning of a transfer layer applied to it, resulting in a templated transfer layer. When imaged, the LITI donor film transfers at least a portion of the templated transfer layer to a permanent receptor while maintaining the pattern substantially intact in the transferred portion. | 2009-12-31 |
20090322220 | ELECTRO-OPTIC DEVICE AND ELECTRONIC INSTRUMENT - An electro-optic device includes spaced apart pixel electrodes in respective unit areas arranged in a plane defined by dividing the plane into common shapes without gaps, and an electro-optic layer facing the pixel electrodes. In response to an applied first electric potential to the pixel electrodes, the electro-optic layer expresses a first grayscale, and in response to an applied second electric potential, it expresses a second grayscale. The distance between adjacent pixel electrodes is selected so that a boundary between an area expressing the first grayscale and an area expressing the second grayscale is substantially identical to a boundary between the unit area provided with one of the adjacent pixel electrodes and the unit area provided with another of the adjacent pixel electrodes. | 2009-12-31 |
20090322221 | Closely Spaced Electrodes with a Uniform Gap - An improved design for maintaining separation between electrodes in tunneling, resonant tunneling, diode, thermionic, thermo-photovoltaic and other devices is disclosed. At least one electrode | 2009-12-31 |
20090322222 | Robust activation method for negative electron affinity photocathodes - A method by which photocathodes ( | 2009-12-31 |
20090322223 | STARTER MEMBER FOR A LOW-PRESSURE DISCHARGE LAMP - Disclosed is a starter member to which a mercury-absorbing layer is applied and which can be used in low-pressure mercury discharge lamps. A starter member for a low-pressure amalgam discharge lamp comprises a mercury-absorbing layer on a base. A coating layer which is provided on the mercury-absorbing layer has a getter effect and prevents the material of the mercury-absorbing layer from coming off. | 2009-12-31 |
20090322224 | STARTING AID FOR HID LAMP - An arc discharge light source ( | 2009-12-31 |
20090322225 | Starting Aid for HID Lamp - A high-intensity discharge lamp includes a discharge vessel made of an insulator, and a cathode and anode. A V-shaped gap is provided between the anode and a first region of the vessel directly adjacent to where the anode separates from an interior surface of the vessel. A secondary cathode is provided on an exterior surface of the vessel at the first region, where the secondary cathode is positioned so that the V-shaped gap and the first region are between the secondary cathode and the anode. An electric field at the first region produces a dielectric barrier discharge (DBD) which generates ultraviolet (UV) and vacuum ultraviolet VUV photons that impinge on the cathode and initiate a breakdown between the cathode and anode. | 2009-12-31 |
20090322226 | High-pressure discharge lamp - High-pressure discharge lamp, with an outer bulb ( | 2009-12-31 |
20090322227 | IMPROVED LED ARRAY - An LED array and a method for controlling such an array is described. The array includes one or more LED-optical sensor pairs in which the optical sensor measures the light output of the associated LED. In some forms of the invention, the optical sensors are provided with filters to attenuate light at a wavelength different to that of the LED associated with that optical sensor. In some forms of the invention, the LED-optical sensor pairs are at least partially shielded from extraneous light. In one form of the invention a plurality of sets of LEDs is provided, each set outputting light having a different frequency and each set being controllable to provide a desired light output. | 2009-12-31 |
20090322228 | False Failure Prevention Circuit In Emergency Ballast - A backup ballast used with a primary ballast for providing power to one or more lamps. The backup ballast includes an output switch and a delay circuit. The output switch has a first operating mode for connecting a primary power source via the primary ballast to a first set of the lamps and second operating mode for connecting a backup power source with a second set of the lamps. The output switch operates in the first operating mode when it is energized and in the second operating mode when said it is not energized. The delay circuit is adapted for connecting to the primary power source for receiving power therefrom. The delay circuit is connected to the output switch for energizing it while the power is being received and for a delay period thereafter. The delay circuit includes an energy-storage component for storing energy while the power is being received and discharging the stored energy when the power is not being received in order to energize the output switch for the delay period. | 2009-12-31 |
20090322229 | LED Lighting Fixture - An LED lighting fixture compatible with existing incandescent lamp lighting fixtures. The heat produced by the LED light source is dissipated through a heat pipe into a ground hole to maintain an optimum operation temperature of the LED light source. | 2009-12-31 |
20090322230 | BUTTON ASSEMBLY - A button assembly includes a button, an indicating lamp, a rheostat and a switch. The button includes a transparent pressing portion. The indicating lamp is positioned in the pressing portion. The rheostat includes a base and an adjuster rotatably attached to the base. The adjuster is rotated by rotation of the button. The switch is capable of being triggered by downwardly movement of the button. | 2009-12-31 |
20090322231 | LAMP-HOLDING DEVICE AND SYSTEM COMPRISING LAMP-HOLDING DEVICES AND WIRELESS CONTROLLER - The invention relates to a lamp-holding device ( | 2009-12-31 |
20090322232 | BRIGHTNESS-AJUSTABLE ILLUMINATION DEVICE AND ILLUMINATION SYSTEM USING THE SAME - A brightness-adjustable illumination device includes at least two electric lamps and a control module electronically connected to the at least two electric lamps for controlling the lamps on and off. The control module obtains brightness of local environment of the lamps, and controls the number of the lamps turned on according to the brightness of the local environment. A brightness-adjustable illumination system is also disclosed. | 2009-12-31 |
20090322233 | LIght detecting apparatus and output light intensity controller - A light detecting apparatus receives input light branched and output by a branching device, to calculate transmittance and reflectivity from the input light, acquires a wavelength corresponding to the calculated transmittance and reflectivity to calculate a gain value corresponding to input light intensity, acquires a driving current value corresponding to a calculated gain value and an acquired wavelength, and outputs an acquired driving current value. | 2009-12-31 |
20090322234 | LED DRIVER WITH MULTIPLE FEEDBACK LOOPS - An LED driver includes at least two interlocked closed feedback loops. One feedback loop controls the duty cycle of the on/off times of a switch connected in series to the LED string, and the other feedback loop controls the duty cycle of the on/off times of a power switch in the switching power converter that provides a DC voltage applied to the LED string. The LED driver of the present invention achieves fast control of the LED brightness and current sharing among multiple LED strings simultaneously in a power-efficient and cost-efficient manner. | 2009-12-31 |
20090322235 | LED DRIVING CIRCUIT, LED DRIVING CONTROL UNIT AND TRANSISTOR SWITCH MODULE THEREOF - An LED driving circuit is used for dimming by switching between an operating current and a maintaining current or by voltage clamping of a source/drain of MOSFET that is coupled to the LED module. When the LED module is dimmed off, the voltage across the LED module can be kept at a value around a lighting threshold voltage of the LED module that is a minimum voltage for lighting the LED module. Therefore, a voltage difference between the drain and the source of MOSFET coupled to the LED module is smaller than that in the conventional arts. Hence, a withstand voltage of MOSFET can be reduced, and cost of the LED driving circuit as well as the power consumption of MOSFET can be lessened, thereby improving integral efficiency of the circuit. | 2009-12-31 |
20090322236 | Christmas light string with LED bulb loop and incandescent light bulb loop - A Christmas light string includes a plug; a first negative wire together with a first positive wire and the plug forming a circuit; incandescent light bulbs connected together along the first positive and negative wires to form a first loop; a rectifier having a positive input connected to the first incandescent light bulb via a second positive wire and a negative input connected to the last incandescent light bulb via a second negative wire; an end enlargement connected to the positive input of the rectifier via the second positive wire and the negative input of the rectifier via the second negative wire; and LED bulbs forming a second loop between the positive output and the negative output of the rectifier. An optimum illumination is rendered by mixing cold light with warm light. Moreover, mating sockets are adapted to receive the incandescent light bulbs only. | 2009-12-31 |
20090322237 | APPARATUS AND METHOD ENABLING FULLY DIMMABLE OPERATION OF A COMPACT FLUORESCENT LAMP - An electronic ballast circuit and related method for enabling full range dimming of a gas discharge load such as a compact fluorescent lamp. | 2009-12-31 |
20090322238 | Internal Power Supply for a Ballast - A ballast used with an input power source for energizing a lamp. The ballast includes a power stage, a controller, an internal power supply for the power stage and the controller, and an input switch. The power stage energizes the lamp with power supplied by the input power source. The internal power supply is connected to the power stage for receiving power from the power stage and is connected to the input power source via the input switch for receiving power from the input power supply when the input switch operates in a closed mode. When the input switch operates in an open mode it electrically disconnects the internal power supply from the input power source. The controller selectively operates the input switch in the open mode and the closed mode as a function of the voltage of the internal power supply while the lamp is energized. | 2009-12-31 |
20090322239 | Induction lamp lighting device and illumination apparatus - An induction lamp lighting device includes an induction coil arranged adjacent to an induction lamp; a direct current power supply circuit for outputting a direct current voltage; a high-frequency power supply circuit for converting the direct current voltage to an alternating current voltage and supplying the alternating current voltage to the induction coil; and a control circuit for controlling the direct current power supply circuit and the high-frequency power supply circuit. The control circuit performs a startup preparation operation by which to control the high-frequency power supply circuit so that, immediately after the alternating current voltage begins to be outputted from the high-frequency power supply circuit to the induction coil, the alternating current voltage is gradually increased to such a voltage value as not to generate arc discharge in the induction lamp and then kept at the voltage value for a specified time. | 2009-12-31 |
20090322240 | ELECTRODELESS LAMPS WITH EXTERNALLY-GROUNDED PROBES AND IMPROVED BULB ASSEMBLIES - An electrode-less plasma lamps, comprising generally of a bulb containing a gas-fill that is excited to produce light using radio-frequency (RF) energy. In specific embodiments, the use of grounded coupling-elements with integrated bulb assemblies simplifies manufacturability, improves resonant frequency control, and enables the use of solid, partially filled, and hollow lamp bodies. | 2009-12-31 |
20090322241 | AC DRIVEN LIGHT EMITTING DEVICE - An alternating current (AC) driven light emitting device includes a substrate, K number of first light emitting diode (LED) cells arranged in a row on a top surface of the substrate, where K is an integer satisfying K≧3, K number of second LED cells arranged in a row parallel to the row of the first LED cells on the top surface of the substrate, and (K−1) number of third LED cells arranged in a row between the respective rows of the first and second LED cells on the top surface of the substrate. The AC driven light emitting device has a connection structure between LED cells to be operable at an AC. | 2009-12-31 |
20090322242 | Starting circuit of starting device for high-pressure discharge lamp including auxiliary light source, starting device including the starting circuit, and lighting system including the starting device - A starting circuit of a starting device for a high-pressure discharge lamp including an auxiliary light source has a diode placed in a forward direction in one of a pair of output lines which connect a main lighting circuit for generating AC voltage to the high-pressure discharge lamp and the auxiliary light source; a capacitor having one end connected to a cathode side of the diode; a boosting transformer including a primary winding, and a secondary winding having one end connected to an anode side of the diode or to the other output line and also having the other end connected to the other end of the capacitor; a high-frequency voltage generation circuit for continuously generating high-frequency voltage in combination with the primary winding; and a short-circuit switch for maintaining a short-circuit condition at both ends of the diode after the high-pressure discharge lamp is started. | 2009-12-31 |
20090322243 | DRIVING CIRCUIT AND METHOD OF BACKLIGHT MODULE - A driving circuit includes a signal generator, a resonant circuit, a control circuit and an adjusting circuit. The signal generator is utilized for generating an alternating current (AC) signal having a fixed frequency. The resonant circuit is coupled to the signal generator, and is utilized for generating an oscillation signal to drive a backlight source according to the alternating current signal. The control circuit is utilized for providing a control signal. The adjusting circuit is coupled to the control circuit, the resonant circuit and the backlight source, and is utilized for providing an impedance according to the control signal to thereby adjust a current value of the backlight source. | 2009-12-31 |
20090322244 | PIEZOELECTRIC TRANSFORMER LIGHT ADJUSTING NOISE REDUCTION CIRCUIT - Provided is a light adjusting noise reduction circuit in which the vibration noise accompanying turning ON/OFF of a piezoelectric transformer. A full bridge circuit is controlled by a full bridge drive circuit so as to switch an input voltage (VB | 2009-12-31 |
20090322245 | DISCHARGE LAMP LIGHTING APPARATUS - A discharge lamp lighting apparatus includes a DC/AC converter for converting a supplied direct voltage to an alternating voltage and then outputting the alternating voltage, a high-voltage generator for superposing a pulse voltage on the alternating voltage supplied from the DC/AC converter and then outputting the alternating voltage, and a microprocessor for providing a timing to control the high-voltage generator in such a manner that the pulse voltage is superposed on the alternating voltage in synchronism with the alternating voltage. | 2009-12-31 |
20090322246 | Discharge Lamp Ballast and Fixture with Controlled Preheating - Electrical characteristics associated with a filament resistance are detected to control a preheating amount so as to heat a filament into an optimum state for emission in accordance with determined preheating time. | 2009-12-31 |
20090322247 | Dimming buck type LED driving apparatus - A dimming buck type light emitting diode (LED) driving apparatus includes a main switch controlling a driving current flowing into an LED; a current detector detecting a driving current flowing into the LED; a power level determination unit determining a level of the driving power; a dimming capacitor for dimming control; a dimming control unit controlling charging and discharging of the dimming capacitor according to a power level determination signal and an enable signal; a reset circuit unit generating a reset signal according to a detection voltage from the current detector and a voltage of the dimming capacitor; a pulse generation unit generating a pulse signal; and a latch set by the pulse signal of the pulse generation unit and reset by the reset signal of the reset circuit unit to generate a switching signal, and turning on and off the main switch using the switching signal. | 2009-12-31 |
20090322248 | LED DRIVING CIRCUIT AND LIGHT EMITTING DIODE ARRAY DEVICE - There is provided an LED driving circuit. The LED driving circuit according to an aspect of the invention may include: at least one ladder circuit including: (n−1) number (here, n is a positive integer satisfying n≧2) of first branches provided between first and second junction points, and connected in-line with each other by n number of first middle junction points, (n−1) number of second branches arranged in parallel with the first branches, and connected in-line with each other by n number of second middle junction points between the first and second junction points, and n number of middle branches connecting m-th first and second middle junction points to each other, wherein at least one LED device is disposed on each of the first, second, and middle branches. Here, the number of LED devices included in each of the first and second branches is greater than the number of LED devices included in each of the middle branches. | 2009-12-31 |
20090322249 | METHOD FOR CONTROLLING A HIGH-FREQUENCY TRANSFORMER - A method for controlling a high-frequency transformer by which the acoustic transformer noises occurring during intermittent operation (burst operation) are reduced. This is achieved according to the invention by halving a length of the first and the last pulse of an AC voltage pulse train or the first and the last half-wave in the ON interval (Tn). This goes to avoid magnetizing peaks in the core that cause a major part of the background noise. | 2009-12-31 |
20090322250 | NETWORKED ARCHITECTURAL LIGHTING WITH CUSTOMIZABLE COLOR ACCENTS - The present invention provides systems and apparatuses for dynamically controlling the operational modes of a single luminaire or a group of networked luminaires configured to deliver an illumination pattern having a decorative colored glow surrounding a central region of substantially uniform brightness. A control module for the luminaire is configured to drive three dimmable fluorescent ballasts, as well as a LED module. A variety of operational modes including different schemes for color mixing and color cycle control can be selected by a user and implemented by a microcontroller. A group of luminaires is connected in a standard communication protocol-based master-slave configuration, where the slave units respond to commands received from the master unit, and the last slave unit automatically engages terminating and biasing resistors for proper operation of the network. | 2009-12-31 |
20090322251 | LARGE AREA LIGHTING - Within lighting tiles ( | 2009-12-31 |
20090322252 | LED DRIVING CIRCUIT AND A MOSFET SWITCH MODULE THEREOF - An LED driving circuit and a MOSFET switch module thereof is disclosed, and the MOSFET switch module which is used to control a current of the LED driving circuit. The present invention employs a voltage clamping device to clamp the voltage level of the drain of transistor in the MOSFET switch module when being turned off. Via this way, the requirement for the withstand voltage of the transistor is lowered, and so the cost and power consumption thereof is reduced. | 2009-12-31 |
20090322253 | LED Lighting System having a Reduced-Power Usage Mode - An LED lighting system, with first and second types of LEDs of different efficacies, has a reduced-power usage mode. A control system independently controls first and second control groups of first and second types of LEDs, respectively. The control system has one or more modes including a reduced-power usage mode for decreasing the overall power consumption of the lighting system while maintaining a light level of at least a predetermined percentage of the level present when the first control group of LEDs operates at a power level between less-than-full power and full power and the second control group is off. The predetermined percentage is 50. The control system decreases the overall power consumption of the lighting system in the reduced-power usage mode by turning off or dimming the first control group and turning on the second control group to at least some extent. | 2009-12-31 |
20090322254 | Apparatus and method for driving and adjusting light - An apparatus and method for driving and adjusting light is provided, applicable to the LED lighting environment. Without the necessity to change the existing wiring and lighting devices, the apparatus and method for driving and light adjusting apparatus of the present invention can enable the LED driver to adjust light so that the LED lighting device is capable of light adjustment. The apparatus and method for driving and adjusting light of the present invention lets the LED driver output stably to drive LED when the input voltage to the LED driver changes so that the LED brightness can maintain stable without flickering regardless of the unstable input voltage as well as with high efficiency and low variation of LED color temperature. In this manner, in addition to the lighting capability, the LED lighting device also has the light adjustment capability because the LED driver has the light adjustment capability. | 2009-12-31 |
20090322255 | Apparatus and method for driving and adjusting light - An apparatus and method for driving and adjusting light is provided, applicable to the LED lighting environment. Without the necessity to change the existing wiring and lighting devices, the driving and light adjusting apparatus of the present invention can cooperate with LED driver, by counting the number of switch ON/OFF times, to enable the LED driver to adjust light so that the LED lighting device is capable of light adjustment in addition to lighting. | 2009-12-31 |
20090322256 | DRIVE CIRCUIT - Provided is a drive circuit for a light emitting device, which compensates for a decrease in luminance of the light emitting device and reduces a burn-in phenomenon. The drive circuit includes: a first capacitor connected to a gate of a drive transistor; and a second capacitor formed between the first capacitor on a side to which the gate of the drive transistor is not connected, and one end of a light emitting device. The drive circuit corrects an amount of charge of the first capacitor according to a change in potential of the node when the light emitting device starts illumination, and then, causes the light emitting device to illuminate according to the corrected amount of charge. | 2009-12-31 |
20090322257 | SWITCHING MODE POWER SUPPLY FOR PLASMA DISPLAY PANEL - In accordance with the present invention, the SMPS circuit for PDP includes first and second transformers inducing voltages supplied to primary sides to secondary sides; a plurality of DC/DC converters connected to secondary sides of the first and second transformers and supplying voltages of different sizes; a clamp circuit connected to the secondary side of the first transformer and outputting an address voltage of a predetermined size by receiving a voltage supplied from the first transformer; and a linear regulator unit connected to the DC/DC converter for supplying a low voltage among the DC/DC converters connected to the secondary side of the first transformer and outputting a gate voltage of a predetermined size by receiving the low voltage supplied from the DC/DC converter. | 2009-12-31 |
20090322258 | Carbon nanotube electron source - A method of producing an electron source, a carbon nanotube (CNT) electron source, and a method of field emission using an electron source are disclosed. Embodiments provide convenient and effective mechanisms for improving thermal and mechanical performance of CNT electron sources, in one example, by heating a polymer-based matrix (e.g., PDMS) beyond its curing point until the polymer decomposes to form a cross linked and rigid matrix comprising silicon dioxide (SiO | 2009-12-31 |
20090322259 | Visual Marker for Hunters and Outdoorsmen - A lighted visual marker or beacon for use primarily by outdoorsmen is disclosed. The device utilizes LED bulbs that emit a green light that is inoffensive to nocturnal wildlife so as not to alarm them. The device may be mounted to or suspended from a tree or mounted in the ground to provide guidance to paths, campsites, tree-stands and the like. The device is battery powered and capable of being controlled from a control panel beneath a weatherproof cover or can be remotely controlled. The device may be controlled in a simple on/off mode of operation or can be controlled by a timer. | 2009-12-31 |
20090322260 | ELECTROSTATIC MICROACTUATOR - Electrostatic microactuators are described in which stationary electrodes ( | 2009-12-31 |
20090322261 | Microcomputer for controlling ultrasonic motor, and method for controlling ultrasonic motor - A microcomputer that controls an ultrasonic motor includes a storage unit that stores a compare register value, and a digital/analog (D/A) conversion set value, a D/A converter that generates an amplitude control signal with an amplitude value corresponding to the D/A conversion set value, a timer that generates a pulse width modulation (PWM) signal with a frequency corresponding to the compare register value, a central processing unit (CPU) that reads the D/A conversion set value, and the compare register value from the storage unit, and that sets the D/A conversion set value and the compare register value to the D/A converter and the timer, respectively, and an output circuit that generates the control signal with the amplitude of the amplitude control signal, and the frequency of the PWM signal, in response to the amplitude control signal and the PWM signal. The compare register value allows for determining a frequency of the control signal corresponding to a target rotation speed that is targeted by the ultrasonic motor. The D/A conversion set value allows for determining an amplitude of the control signal corresponding to the target rotation speed that is targeted by the ultrasonic motor. | 2009-12-31 |
20090322262 | Controller For Permanent Magnet Synchronous Motor and Motor Control System - A motor control system includes a power converter, a vector controller for controlling the power converter, an axial error estimating operation for estimating an axial error which is a deviation between the phase estimation value and phase value of the motor, and a rotational speed estimating computing unit | 2009-12-31 |
20090322263 | DRIVE AND METHOD - A drive, including an electric motor, which is supplied by a rectifier, the rectifier including a time-discrete closed-loop control structure, which regulates the stator current of the electric motor by setting the voltage applied at the motor, the current of the motor being acquired in time-discrete fashion, the closed-loop control structure including a first closed-loop controller whose setpoint is the output value of a first non-linear transfer member, and whose actual value is the output value of a second non-linear transfer member, the input value of the first non-linear transfer member being the setpoint of a first current component of the current, the input value of the second non-linear transfer member being the actual value of a first current component of the current. | 2009-12-31 |
20090322264 | APPARATUS FOR CARRYING OUT IMPROVED CONTROL OF ROTARY MACHINE - In an apparatus, a first drive unit drives, in a first range of a voltage utilization factor, a switching member to thereby control an output voltage of the power converter to be matched with a command voltage. A second drive unit drives, in a second range of the voltage utilization factor, the switching member to thereby generate a value of a controlled variable of a rotary machine. The second range of the voltage utilization factor is higher than the first range thereof. An estimating unit estimates, during the switching member being driven by the second drive unit, a value of a parameter associated with the output voltage of the power converter. The estimated value is required for the first drive unit to generate the value of the controlled variable generated by the second drive unit. | 2009-12-31 |
20090322265 | AC MOTOR DRIVING APPARATUS AND CONTROL METHOD - Provided is an AC motor driving apparatus and an AC motor control method capable of utilizing the conventional PWM system as-is even in an ultra-compact AC motor having an extremely few turns of exciting coil and preventing occurring of vibration and noise. | 2009-12-31 |
20090322266 | Systems and Methods for Controlling a DC Motor - Various systems and methods for controlling DC motors are disclosed herein. For example, one method provides for controlling a polyphase, brushless DC motor. The method includes providing a DC motor that has a plurality of phases. Such a DC motor operates by inducing a current in the plurality of phases in accordance with a plurality of commutation states. In the example, six commutation states are discussed, but fewer than or more than six commutation states may exist. The method further includes initializing a count, inducing a current in the plurality of phases in accordance with a first commutation state, and incrementing the count until the current achieves a threshold in the first commutation state. Then, a current is induced in the plurality of phases in accordance with a second commutation state, and the count is decremented until the current achieves the threshold in the second commutation state. The sign bit of the count is stored, and a desired initial commutation state is determined based at least in part on the sign bit of the count. | 2009-12-31 |
20090322267 | MOTOR CONTROLLER WITH HALL SENSOR OUTPUT MISALIGNMENT COMPENSATION USING DELAYED OR SHIFTED COMMUTATION - In a normal operating mode, a motor controller provides motor drive current to windings of a motor based on sensor signals to drive the windings in a normal commutation sequence, and monitors for occurrence of a motor stall condition. Upon detecting the motor stall condition in a given commutation state, then in a first driving step, the windings are momentarily driven according to an advanced commutation state, and during the first driving step, a reverse transition of the sensor signals to a state corresponding to a preceding commutation state is detected. Upon completion of the first driving step when such a reverse transition of the sensor signals is detected, then in a second driving step the windings are driven according to the preceding commutation state until a forward transition of the sensor signals is detected, and in a third driving step the windings are momentarily continued to be driven according to the same commutation state notwithstanding the forward transition of the sensor signals before normal operation is resumed. | 2009-12-31 |
20090322268 | ELECTRIC POWER STEERING APPARATUS - There is provided a three-phase brushless motor | 2009-12-31 |
20090322269 | MOTOR CONTROL APPARATUS FOR CONTROLLING MOTOR IN ACCORDANCE WITH ROTATIONAL POSITION OF ROTOR THEREOF - The motor control apparatus includes a power supply function of supplying electric power from a power supply to a motor, a rotational position detecting function of performing detection of a rotational position of a rotor of the motor for respective phases of the motor, and outputting first rotational position data indicative of result of the detection, a control function of controlling a power supply operation of the power supply function in accordance with the first rotational position data, and an induced voltage detecting function of performing detection of induced voltages of the respective phases of the motor. The control function controls the power supply operation of the power supply function in accordance with result of the detection performed by the induced voltage detecting function when the first rotational position data are abnormal. | 2009-12-31 |
20090322270 | VEHICLE MOTOR CONTROL APPARATUS - There is provided a vehicle motor control apparatus that alternately switches a first ON state in which one of the stator winding terminals is energized through an upper switch element group and another stator winding terminal is energized through a lower switch element group and a second ON state in which one of the stator winding terminals is energized through one of the upper switch element group and the lower switch element group and two other stator winding terminals are energized through the other switch element group, in one cycle period of an electric angle that changes as the rotor rotates. | 2009-12-31 |
20090322271 | Device and a Method For Providing Electrical Energy to an Actuator, and an Actuator System - A method for providing electrical energy to an actuator is disclosed. In at least one embodiment, the method includes having a first voltage (UBUS) from a data bus; ii) converting the electric current to a current having a second voltage that is higher than the first voltage; iii) storing electrical energy of the second electric current; and discharging the stored electrical energy to an actuator. A device is also disclosed for providing electrical energy to an actuator. | 2009-12-31 |
20090322272 | MOTOR CONTROL DEVICE - A motor control device includes a motor, a control portion controlling the motor, estimating a heating temperature of the motor on the basis of an electric current value and an energizing time period or a stopping time period of the motor, and restricting an electrification of the motor in a case where the estimated heating temperature becomes equal to or greater than a limit value, and a temperature sensing device for detecting a temperature of a predetermined portion of a vehicle, wherein the control portion estimates an initial temperature of the motor when an engine is started on the basis of a temperature signal outputted from the temperature sensing device and determines the limit value on the basis of the estimated initial temperature. | 2009-12-31 |
20090322273 | METHOD AND APPARATUS FOR CONTROLLING A MOTOR - The invention concerns a method and an apparatus for controlling a three-or-more-phase motor driven by a frequency converter. In the method, a change-over switch of the frequency converter is controlled to a continuously conducting state and at the same time the phase voltages or phase currents of the other phases are controlled by switching the change-over switches in those motor phases at a switching frequency substantially higher than the frequency of the fundamental wave of the phase voltage or phase current. The apparatus comprises in conjunction with the frequency converter a number of change-over switches, at least one change-over switch for each motor phase. The change-over switches comprise controllable change-over contacts. The apparatus further comprises in conjunction with the frequency converter means for determining the motor phase currents and means for controlling the change-over contacts. | 2009-12-31 |
20090322274 | MOTOR CONTROL SYSTEM - A motor control system includes an MMI (man machine interface), an upper-controller, and a motor driver connected in that order. The upper-controller includes a motherboard, a communication control module, and a servo driven control card connected in that order. The motherboard is connected to the MMI and includes a processor. The communication control module includes a plurality of control cards. A control signal is inputted into the MMI and sequentially processed by the processor, the communication control module, and the servo driven control card. A driven signal is outputted from the servo driven control card to the motor driver to drive a motor. | 2009-12-31 |
20090322275 | METHOD AND APPARATUS FOR IMPROVING THE POSITION ACCURACY OF A SERVO MOTOR - A method of operating a motor controlled by a closed loop servo control system is provided. The closed loop servo control system employs a digital filter, such as a PID filter, that employs one or more gain coefficients. The method includes temporarily increasing one or more of the gain coefficients by a corresponding first predetermined amount when the motor reaches a coefficient boost motor position that is a predetermined distance before a commanded motor rest position, and decreasing the one or more of the gain coefficients by a corresponding second predetermined amount a predetermined time after the motor reaches the commanded motor rest position. | 2009-12-31 |
20090322276 | POWER CONVERSION DEVICE - A power conversion device includes a main circuit that has switches connecting each phase of a three-phase AC power supply to each output phase, an LC filter having a reactor and a capacitor connected between the three-phase AC power supply and each bidirectional switch, and a current detector detecting an input current or a load current, and a four-step commutation device generating four steps on the basis of the polarity of the load current. The four-step commutation device sets times between the steps to a value more than zero so as to inhibit open circuit between output phases and short circuit between power supply phases, and sets the times between the steps in accordance with the polarity of the load current so as to cancel a distortion of an output voltage due to four-step commutation during a PWM cycle. | 2009-12-31 |