Patent application number | Description | Published |
20090185780 | Fluorine-Doped Optical Fiber - A single mode optical transmission fiber comprises a depressed core having at least 0.41 weight percent fluorine and an index difference (|Δn | 07-23-2009 |
20100021117 | Single-Mode Optical Fiber - Disclosed is an optical transmission fiber having reduced bending and microbending losses that is commercially usable in FTTH or FTTC transmission systems. | 01-28-2010 |
20100067859 | Single Mode Optical Fiber - An optical transmission fiber comprises a central core having an index difference Δn | 03-18-2010 |
20100189398 | Optical Fiber Preform - An optical fiber preform comprises a primary preform that includes at least one inner cladding and a central core deposited inside a fluorine doped silica tube. The fluorine doped silica tube has a cross section area that is no more than about 15 percent smaller than the cross section area of the primary preform. The optical fiber preform has a large capacity, may be manufactured at reduced cost, and may be drawn to produce an optical fiber having reduced transmission losses. | 07-29-2010 |
20100189928 | Method for Manufacturing an Optical Fiber Preform - A method for manufacturing an optical fiber preform includes the steps of depositing an inner cladding and a central core inside a fluorine doped silica tube and thereafter collapsing the silica tube to form a primary preform. The fluorine doped silica tube has a cross section area that is no more than about 15 percent smaller than the cross section area of the resulting primary preform. The present method facilitates reduced-cost manufacturing of a high-capacity optical fiber preform, which may be drawn to produce an optical fiber having reduced transmission losses. | 07-29-2010 |
20100251775 | DEUTERIUM TREATMENT METHOD FOR OPTICAL FIBRES - A treatment method for an optical fibre including the steps of exposing the fibre to an atmosphere containing deuterium at a given temperature, concentration and pressure, measuring the attenuation in the fibre as a function of time at least one wavelength, during the exposure of the fibre to an atmosphere containing deuterium, identifying an attenuation maximum after an exposure duration, and stopping the exposure of the fibre to the atmosphere containing deuterium when said duration has elapsed. | 10-07-2010 |
20110164852 | Single-Mode Optical Fiber - Disclosed is an optical transmission fiber having reduced bending and microbending losses that is commercially usable in FTTH or FTTC transmission systems. | 07-07-2011 |
20110286710 | Single Mode Optical Fiber - An optical transmission fiber comprises a central core having an index difference Δn | 11-24-2011 |
20120036896 | Method of Manufacturing an Optical Fibre Preform - The present invention relates to a method for manufacturing a preform for optical fibres, wherein deposition of glass-forming compounds on the substrate takes place. The present invention furthermore relates to a method for manufacturing optical fibres, wherein one end of a solid preform is heated, after which an optical fibre is drawn from said heated end. | 02-16-2012 |
20120039361 | DEPRESSED GRADED INDEX MULTI-MODE OPTICAL FIBER - A multi-mode optical waveguide fiber including a central core region having an outer radius surrounded by an inner cladding region having an outer radius, the inner cladding region having a lower index of refraction than the central core region, wherein both the central core and inner cladding regions are doped with fluorine, wherein the refractive index profile of the central core region is of the gradient index type and the central core region in the range of rε[0-r | 02-16-2012 |
20120040184 | Method of Fabricating an Optical Fiber Preform - A method of manufacturing an optical fiber preform includes preparing from a first deposition tube a first rod that includes a central core and preparing from a second deposition tube a second rod that includes a buried trench. The method further includes fitting the second rod as a sleeve over the first rod. This disclosed method facilitates the manufacture of large-capacity fiber preforms using deposition benches having small and/or medium deposition capacity. | 02-16-2012 |
20120195549 | Broad-Bandwidth Optical Fiber - The present invention embraces an optical fiber that includes a central core having an alpha refractive index profile with respect to an outer optical cladding. The optical fiber also includes an inner cladding and a buried trench. The central core includes a core matrix doped with at least fluorine and a dopant element that increases refractive index. The optical fiber typically has reduced bending losses and cladding effect as well as a high bandwidth at the wavelengths of 850 nanometers and 1300 nanometers for high-data-rate applications. | 08-02-2012 |
20120243843 | Bend-Resistant Multimode Optical Fiber - A multimode optical fiber includes a central core surrounded by an outer cladding. The central core has a graded-index profile with respect to the outer cladding and an outer radius r | 09-27-2012 |
20120275751 | High-Bandwidth, Radiation-Resistant Multimode Optical Fiber - A multimode optical fiber includes a central core and an outer cladding (e.g., an outer optical cladding). Typically, the optical fiber's central core is a depressed, central core having an alpha-index profile (i.e., a graded-index profile), an outer radius r | 11-01-2012 |
Patent application number | Description | Published |
20120182833 | ULTRASONIC ID READER - A method for identifying a warhead in an aircraft launch tube includes providing a pattern of grooves on the surface of a warhead, with the pattern of grooves being associated with an identification code identifying the warhead or a characteristic of it, providing the warhead in an aircraft launch tube, providing a piezoelectric transducer on the launch tube, emitting an ultrasonic wave from the piezoelectric transducer to the pattern of grooves, where the wave encounters the pattern of grooves at an angle of less than 90° so that waves striking the interior of a groove are reflected back to the transducer as echo waves, while waves not striking the interior of a groove are reflected away from the transducer, and reading the pattern of returning echo waves to determine the identification code indicated by the pattern of grooves on the warhead. | 07-19-2012 |
20130147316 | ENHANCED BANDWIDTH TRANSDUCER FOR WELL INTEGRITY MEASUREMENT - A single critically damped acoustic stack yields a wide frequency range as an acoustic transmitter or as an acoustic transducer having particular use in well integrity determination. The critically damped present acoustic stack utilizes a plurality of stacked acoustic elements such as piezoelectric ceramics that are energized in two manners, providing different center frequencies; each producing a respective center frequency of 100% bandwidth to yield an acoustic stack having a total bandwidth exceeding the bandwidth of an acoustic element or the bandwidth of the plurality of acoustic elements. One manner of energizing is to pulse only one of the acoustic elements. The other manner is to pulse a first acoustic element the pulse a second acoustic element after a delay equal to the amount of time it takes for the first pulse to reach the face of the second acoustic element. The acoustic elements are bonded together and onto a critically damped backing of tungsten. The assembly is retained in a housing that is preferably made of PEEK. The acoustic stack is primarily used in pulse-echo analysis of metal casing wall thickness and cement bond quality detection of wells. | 06-13-2013 |
20130279722 | TEMPERATURE COMPENSATED PIEZOELECTRIC BUZZER - A buzzer includes a piezoelectric diaphragm and a housing enclosing the diaphragm and defining a resonating chamber. The chamber includes a sound port and has an optimal resonating frequency f | 10-24-2013 |
20130327827 | ULTRASONIC IDENTIFICATION OF REPLACEABLE COMPONENT FOR HOST SYSTEM - A system, method and device are provided for detecting the presence of, and/or obtain information about, a replaceable component for a host system. A host system has an ultrasonic transducer pair that detects the presence of, and/or obtains information about, a replaceable component for a host system through receipt or non-receipt of an ultrasonic signal. The replaceable component includes a key or other feature that either allows the transmission of a transmitted ultrasonic signal, or which does not allow the reception of the transmitted ultrasonic signal, depending on the host configuration. | 12-12-2013 |
20130342077 | LOW FREQUENCY BROAD BAND ULTRASONIC TRANSDUCERS - Low frequency pulse-echo ultrasonic transducers are provided especially suited for use in downhole cement bond evaluation, but usable for various applications. One frequency pulse-echo ultrasonic transducer comprises a transducer stack having alternating layers of a piezoceramic element and an ultrasonic attenuating element that is preferably acoustic impedance matched to the piezoceramic elements in order to reduce the Q of the transducer stack. Another low frequency pulse-echo ultrasonic transducer comprises an assembly having the present transducer stack disposed on an acoustic attenuating backing and a front face. Yet another low frequency pulse-echo ultrasonic transducer comprises a transducer composite made from a lead metaniobate. Still another frequency pulse-echo ultrasonic transducer comprises a composite stack. A further low frequency pulse-echo ultrasonic transducer comprises a composite stack, wherein multiple drive elements allow driving individual elements at different times. The transducers may be driven in a multiple-pulse time delayed manner. | 12-26-2013 |
20140062259 | PULSE-ECHO ACOUSTIC TRANSDUCER - A piezoceramic pulse-echo acoustic transducer includes protection layers for the piezoceramic that are tuned to the piezoceramic so as to optimize pulse-echo signal response (i.e. greater output signal bandwidth and increased return signal sensitivity). The protection layers are tuned to the piezoceramic via material selection and thickness. The acoustic transducer has a backing, a piezoceramic adjacent the backing, an intermediate protection layer adjacent the piezoceramic, and a front protection layer adjacent the intermediate protection layer and opposite the piezoceramic. The front and intermediate protection layers are tuned to the piezoceramic via their acoustic impedance such that the acoustic impedance of the intermediate layer is greater than the acoustic impedance of the piezoceramic and of the front protection layer. The acoustic impedance of the front protection layer is less than the acoustic impedance of the piezoceramic. | 03-06-2014 |
20140219057 | SYSTEM AND DEVICE FOR ACOUSTIC MEASURING IN A MEDIUM - A device for acoustic measuring in a medium in a borehole such as velocity of sound in the medium or velocity of the medium, includes at least a first acoustic array situated in a first, slanted sidewall of a measuring area and operating to emit a series of acoustic waveforms across a measuring area. In one form, the device includes a second acoustic array situated in a second, slanted sidewall of the measuring area and operating to receive an acoustic signal resulting from the emitted series of acoustic waveforms or to receive said acoustic signal and emit a second series of acoustic waveforms. A the processor measures a time between when a predefined portion of one of the series of acoustic waveforms was emitted and when a predefined portion of the received acoustic signal corresponding to the predefined portion of one of the series of acoustic waveforms is received by the acoustic receiver, and correlates the measured time to a reference time, then outputs a correlation factor for determining the velocity of sound in the medium in the measuring area. The processor may also calculate transit time for the two emitted acoustic signals or echoes from the first emitted acoustic signals to determine medium flow velocity. | 08-07-2014 |
20140265732 | PRESSURE-COMPENSATED TRANSDUCER ASSEMBLY - A pressure-compensated transducer assembly has an inner housing with a closed transducer end and an outer housing with an open transducer end. A piezoelectric assembly is in the closed transducer end of the inner housing. A liquid-filled inter-housing space is between the outer housing and the inner housing, and has a transducer end open to the environment and a connection end open to the piezo assembly space. A blocking member separates the transducer end of the inter-housing space from the connection end, and prevents fluids from flowing between the two ends. The blocking member is movable within the inter-housing space in response to pressure differences the environment and the interior space. | 09-18-2014 |
20140270277 | SOUNDER ASSEMBLY FOR EXPLOSIVE ENVIRONMENT - An insulated sounder assembly may include: a) a sounder cup having a bottom and a sidewall; b) a piezoelectric element positioned in the bottom of the cup; c) a potting layer within the sounder cup and spaced apart from the piezoelectric element so that the potting layer contacts the cup sidewall for a distance of at least 3 mm around the entire circumference of the cup, and so that a gap exists between the piezoelectric element and the potting layer, with the gap being sufficient to allow vibration of the piezoelectric element in the sounder cup without restriction by the potting layer; and d) an electrical contact wire attached to the piezoelectric element to provide a voltage to the piezoelectric element, wherein the electrical contact wire passes through the potting layer so that at least 3 mm of bare wire is completely embedded in said potting layer. | 09-18-2014 |
20150322768 | ENHANCED BANDWIDTH TRANSDUCER METHOD FOR WELL INTEGRITY MEASUREMENT - A single critically damped acoustic stack yields a wide frequency range as an acoustic transmitter or as an acoustic transducer having particular use in well integrity determination. The critically damped present acoustic stack utilizes a plurality of stacked acoustic elements such as piezoelectric ceramics that are energized in two manners, providing different center frequencies, each producing a respective center frequency of 100% bandwidth to yield an acoustic stack having a total bandwidth exceeding the bandwidth of an acoustic element or the bandwidth of the plurality of acoustic elements. One manner of energizing is to pulse only one of the acoustic elements. The other manner is to pulse a first acoustic element then pulse a second acoustic element after a delay equal to the amount of time it takes for the first pulse to reach the face of the second acoustic element. The acoustic stack is primarily used in pulse-echo analysis of metal casing wall thickness and cement bond quality detection of wells. | 11-12-2015 |
20150379311 | ULTRASONIC IDENTIFICATION OF REPLACEABLE COMPONENT FOR HOST SYSTEM - A system, method and device are provided for detecting the presence of, and/or obtain information about, a replaceable component for a host system. A host system has an ultrasonic transducer or transducer pair that detects the presence of, and/or obtains information about, a replaceable component for a host system through receipt or non-receipt of an ultrasonic signal. The replaceable component includes a key or other feature that either allows the transmission or reflection of a transmitted ultrasonic signal, or which does not allow the reception or reflection of the transmitted ultrasonic signal, depending on the host configuration. | 12-31-2015 |
Patent application number | Description | Published |
20100052569 | ELECTRONIC DEVICE FOR DRIVING LIGHT EMITTING DIODES - The present invention relates to an electronic device for driving a light emitting diode, which includes a switch (Ts) being adapted to switch a switch-mode power converter, and controlling means (CNTL) being adapted for controlling the switch (Ts) in response to a sensing value (Vs) indicative of a current of the switch-mode power converter and for controlling by the switch (Ts) the output voltage of the switched power converter and a current (Iout) through the light emitting diode. | 03-04-2010 |
20110068713 | METHOD AND CIRCUIT ARRANGEMENT FOR CYCLE-BY-CYCLE CONTROL OF A LED CURRENT FLOWING THROUGH A LED CIRCUIT ARRANGEMENT, AND ASSOCIATED CIRCUIT COMPOSITION AND LIGHTING SYSTEM - The invention provides a method for cycle-by-cycle control of a LED current (ILED) flowing through a LED circuit arrangement (LEDCIRC) at a mean LED current level. The method comprises a) establishing a converter current (IL), b) establishing an oscillation of the converter current (IL) between substantially a valley current level and substantially a peak current level, c) feeding the LED circuit arrangement (LEDCIRC) with the converter current (IL) as the LED current during a part of an oscillation cycle of the oscillation of the converter current, d) determining a current level correction for compensating a current level error between an integral over an oscillation cycle of the LED current and a reference, the reference being representative of the mean LED current level, and e) adjusting at least one of the valley current level and the peak current level with the current level correction for use in a successive cycle of the oscillation of the converter current. The invention also provides a circuit arrangement operable for using the method, a LED driver IC using the circuit arrangement, a circuit composition with at least one LED and the circuit arrangement, and a lighting system with the circuit composition. | 03-24-2011 |
20110164339 | SURGE PROTECTION CIRCUIT - A surge protection circuit for a circuit having a rectification module. The surge protection circuit includes a first diode, a second diode, a capacitor and a discharge device. The anode of the first diode is connected to a first input of the rectification module, and the anode of the second diode is connected to a second input of the rectification module. The cathodes of the first and second diodes are both connected to the first plate of the capacitor. The second plate of the capacitor is connected to the negative output of the rectification module. The capacitor is configured such that it is consistently charged to substantially the peak value of a supply voltage during normal operation between surge events. The discharge device is connected to the first plate of the capacitor and is configured to discharge the capacitor when the voltage across the capacitor is in excess of the peak of the maximum value of the normal supply voltage and not discharge the capacitor when the voltage across the capacitor is not in excess of the peak of the maximum value of the normal supply voltage. | 07-07-2011 |
20110187335 | CONTROL OF A HALF RESONANT CONVERTER FOR AVOIDING CAPACITIVE MODE - This invention relates to improved methods of preventing MOSFET damage in a resonant switched mode power converter ( | 08-04-2011 |
20110188270 | CIRCUIT - A circuit comprising a power factor correction stage having a DC input, a ground input, a DC output and a ground output; a capacitor; a diode; and discharge means. A first terminal of the diode is connected to an input of the power factor correction stage, a second terminal of the diode is connected to the first plate of the capacitor; and the second plate of the capacitor is connected to the other input of the PFC stage. The discharge means is connected to the capacitor and is configured to discharge the capacitor such that it contributes to the output of the PFC stage when the level of a signal at the input of the PFC stage falls below a threshold value. | 08-04-2011 |
20110188273 | POWER FACTOR CORRECTION STAGE - A power factor correction stage comprising: an input terminal configured to receive an input signal; an output terminal configured to provide an output signal; a first converter stage and one or more further converter stages, wherein each of the converter stages is connected to the input terminal and the output terminal, and each converter stage comprises a switch; and a controller configured to operate the switches of the converter stages. The controller is configured to operate the switch of the one or more further converter stages at a period of time after operation of the switch of the first converter stage for a current switching cycle, wherein the period of time corresponds to a proportion of the switching frequency for an earlier switching cycle that does not correspond to substantially the period of the earlier switching cycle divided by the number of converter stages. | 08-04-2011 |
20110193612 | METHODS OF CONTROLLING A SYNCHRONOUS RECTIFIER - Consistent with an example embodiment, there is a method of controlling a synchronous rectifier having an input signal having oscillations therein and a switch which is switchable between an open state and a closed state. The method comprises filtering the input signal to produce a filtered signal, comparing the filtered signal with a reference value, and opening the switch in response to the comparison, in which the filtering is active filtering. | 08-11-2011 |
20110261599 | CONTROLLER FOR A POWER CONVERSION CIRCUIT - A power conversion controller for controlling the operation of a switch in a power conversion circuit, wherein the power conversion controller is configured to operate the switch according to: a variable frequency mode of operation for switching frequencies greater than a minimum threshold value; and a fixed frequency mode of operation at a switching frequency equal to the minimum threshold value. | 10-27-2011 |
20110267856 | PFC WITH HIGH EFFICIENCY AT LOW LOAD - A Power Factor Corrector (PFC), typically used as the first stage of switched mode power supplies, particularly suited for Universal Mains inputs, is disclosed, along with methods for controlling a switched mode power supply having power factor correction. In order to increase efficiency, particularly under low load conditions, without undue degradation of the Power Factor, the switching of the PFC circuit is confined to one or more operating windows within each half-cycle. In embodiments, the operating window comprises a small time window centred around the peak of the mains voltage. The higher the power level, the wider the switching window. | 11-03-2011 |
20110280050 | POWER CONVERTER - The invention refers to a power converter and to a method for power conversion. The power converter includes a primary winding adapted to receive a primary alternating voltage. The converter further includes a first secondary circuit magnetically coupled to the primary winding, the first secondary circuit generating a first secondary output signal, the power converter further includes a second secondary circuit magnetically coupled to the primary winding. The power converter includes a post regulator adapted to be coupled to the second secondary circuit, the post regulator having a switch which is opened at every zero-crossing of the first output signal. | 11-17-2011 |
20120014146 | POWER-DEPENDANT MAINS UNDER-VOLTAGE PROTECTION - A method and controller for power dependant mains under-voltage (“brown-out”) protection is disclosed. Brown-out protection is meant for protection against overheating due to low mains voltage and associated high mains current. Usually this is coupled to the absolute value of the mains voltage, but for devices operating at low power this is not necessary, as overheating will not occur. The disclosed method and controller allow for lower mains voltages at low load by comparing the mains voltage with a signal indicating the actual power level of the power supply. | 01-19-2012 |
20120112711 | POWER FACTOR CONTROLLER WITH ERROR FEEDBACK, AND A METHOD OF OPERATING SUCH A POWER FACTOR CONTROLLER - A power factor controller is disclosed, in which error feedback is provided my means of a parallel combination of at least two error feedback channels. By providing at least two error feedback channels, the stability associated with, for instance, a continuously integrated feedback loop with relatively long time constant, may be combined with a fast transient response associated with, for instance, a sample-and-hold error feedback. | 05-10-2012 |
20120127761 | CIRCUIT FOR A RESONANT CONVERTER - A circuit ( | 05-24-2012 |
20120217898 | ELECTRICAL LOAD DRIVING CIRCUIT - Circuits and methods for driving electrical loads, where each is driven according to a desired current. A circuit comprising a switch mode converter comprising a transformer with primary and secondary windings, the primary connected to a voltage supply via one or more input control switches; output circuits, each comprising a switch connecting a load to an output of the secondary, each load series connected with a respective switch and in parallel with a capacitor; and a switching control circuit for control of each of the output circuit switches and for sensing a current through the loads. The switching control circuit operates the output circuit switches to maintain set current through the loads, the switching control circuit configured in successive output cycles of the switch mode converter to operate each output circuit switch in an order dependent on a forward voltage of each of the respective loads. | 08-30-2012 |
20130154494 | ELECTRONIC DEVICE FOR DRIVING LIGHT EMITTING DIODES - The present invention relates to an electronic device for driving a light emitting diode, which includes a switch (Ts) being adapted to switch a switch-mode power converter, and controlling means (CNTL) being adapted for controlling the switch (Ts) in response to a sensing value (Vs) indicative of a current of the switch-mode power converter and for controlling by the switch (Ts) the output voltage of the switched power converter and a current (Tout) through the light emitting diode. | 06-20-2013 |
20130301176 | PROTECTION CIRCUIT FOR A CASCODE SWITCH, AND A METHOD OF PROTECTING A CASCODE SWITCH - A circuit arrangement is disclosed comprising: a normally-on transistor (such as a HEMT) having first and second transistor main terminals and a non-insulated control terminal, the non-insulated control terminal being electrically coupled to a ground; a normally-off switch having first and second switch main terminals and a switch control terminal, the normally-off switch being arranged in a cascode configuration with the normally-on transistor, the first switch main terminal being electrically coupled to the second transistor main terminal, the switch control terminal being electrically coupled to the second switch main terminal and to the ground; and a control circuit configured to switch on the normally-off switch in response to the voltage at the first switch main terminal being negative relative to the ground. | 11-14-2013 |
20140071719 | NOISE FILTERING - A noise filter circuit uses open loop signal processing to process the signal that causes the noise and generate a signal to be fed back into the system to cancel noise currents. | 03-13-2014 |
20140146428 | CASCODED SEMICONDUCTOR DEVICES - The invention provides a cascode transistor circuit with a main power transistor and a cascode MOSFET formed as an integrated circuit, packaged to form the cascode transistor circuit. A control and protection circuit is integrated into the integrated circuit together and a storage capacitor provides an energy source to drive the control and protection circuit. A charging circuit is also integrated into the integrated circuit for charging the storage capacitor. | 05-29-2014 |
20140210370 | RESONANT CONVERTER CONTROL - The invention relates to methods of controlling operation of a resonant power converter and to controllers configured to operate according to such methods. Embodiments disclosed include a method of controlling a power output of a resonant power converter comprising first and second switches (S | 07-31-2014 |
20140218048 | NOISE SENSOR - The present invention relates to a noise sensor for an alternating or direct current power supply. The sensor comprises a noise sensing unit and a noise separator. The noise separator is configured to receive first, second and third input signals and provide a first output signal representative of the common mode noise and a second output signal representative of the differential mode noise. The noise sensing unit comprises a first capacitive element, a second capacitive element, a first resistive element and a second resistive element. | 08-07-2014 |
20140320096 | Voltage Generator - The disclosure relates to a voltage generator for providing an output voltage in accordance with a received target signal, the voltage generator comprising: a resonant converter configured to receive an input voltage, the resonant converter comprising: a first switch; a second switch connected in series with the first switch between the input voltage and ground (GND); a resonant tank associated with the second switch; an output capacitor coupled to the resonant tank and configured to provide an output voltage; and a rectifier configured to allow charge to flow in a single direction between the resonant tank and the output capacitor; and a controller configured to receive the target signal and to set an operating parameter of the resonant converter in accordance with a difference between an output value which is related to the output voltage and the target signal. | 10-30-2014 |
20150015155 | ELECTRONIC DEVICE FOR DRIVING LIGHT EMITTING DIODES - The present invention relates to an electronic device for driving a light emitting diode, which includes a switch (Ts) being adapted to switch a switch-mode power converter, and controlling means (CNTL) being adapted for controlling the switch (Ts) in response to a sensing value (Vs) indicative of a current of the switch-mode power converter and for controlling by the switch (Ts) the output voltage of the switched power converter and a current (Tout) through the light emitting diode. | 01-15-2015 |
20150117066 | SWITCHED MODE CONVERTER AND METHODS OF CONTROLLING SWITCHED MODE CONVERTERS - A method is disclosed of controlling a switched mode converter comprising a switch and for providing power to device having a load, comprising: in response to the load exceeding a first threshold, operating in a first mode, being a CCM; in response to the load exceeding a second threshold and not exceeding the first threshold, operating in second mode, being a BCM without valley skipping wherein the switching frequency increases with decreasing load; in response to the load exceeding a third threshold and not exceeding the second threshold, operating in a third mode, being a BCM with valley skipping, wherein the switching frequency depends on the load and the number of valleys skipped and is between a fixed upper and a lower switching frequency limit; and in response to the load not exceeding the third threshold, operating in a fourth mode, being a BCM with valley skipping, wherein the switching frequency depends on at least the load, and is between an upper and a lower switching frequency limit wherein the upper switching frequency limit decreases with decreasing load. A switched mode converter controlled by such a method is also disclosed. | 04-30-2015 |
20160061871 | NOISE DETECTION CIRCUIT - A noise detection circuit | 03-03-2016 |