Patent application number | Description | Published |
20090161395 | HIGH OUTPUT CURRENT SPLIT PACKAGE A/C ADAPTER - A power adapter, including an AC input terminal, an AC-DC power converter, a DC-DC power converter, and an output terminal, wherein the AC-DC power converter and the DC-DC power converter are separate components, and wherein the power AC input terminal, AC-DC power converter, DC-DC power converter and the output terminal are connected sequentially via a plurality of cords. | 06-25-2009 |
20090262560 | Current Controlled Synchronous Rectifying Drive Circuit - A current controlled synchronous rectifying drive circuit including a current transducer ST having a primary winding connected in series with a synchronous rectifier SR and having a secondary winding to detect a current signal of a synchronous rectifier SR, a signal shaping and reset circuit connected to the secondary winding of the current transducer ST to convert the synchronous rectifier SR's current signal into a voltage signal and shapes it into a pulse signal, a push-pull power amplifying circuit having an input end connected to the signal shaping and reset circuit and an output end connected to a gate of the synchronous rectifier SR to amplify a drive signal generated by the signal shaping and reset circuit to drive the synchronous rectifier SR, and a drive self-bias drive circuit having an input end connected to the secondary winding of the current transducer ST and an output end connected to the push-pull power amplifying circuit to store energy from the current transducer ST to generate a voltage source. | 10-22-2009 |
20090290397 | Primary Sampling Current Controlled Synchronous Rectifying Drive Circuit - A primary winding current controlled synchronous rectifying drive circuit including a current sampling circuit that detects a current signal in a primary winding of a transformer and forwards it to a signal shaping and reset circuit, and a current compensation signal circuit that compensates a magnetizing current in the primary winding of the transformer, wherein the signal shaping and reset circuit converts a sample of the current signal into a voltage signal and shapes it into a pulse signal, and then forwards the current signal to a logic control and power drive circuit that converts the pulse signal into one or more drive signal(s) through logic control, then the drive signal(s) are amplified to drive a corresponding synchronous rectifier. | 11-26-2009 |
20100182117 | High Frequency Magnetic Current Transducer - A pulse current transducer including at least one open core, an armature, together with the at least one open core form a closed magnetic circuit, a winding wound around the at least one open core, at least one signal output pin connected to the at least one open core, and a conducting strip between the armature and the at least one open core. | 07-22-2010 |
20100225219 | LED Lamp System Utilizing A Hollow Liquid-Cooled Device - A LED lamp system including an electric linker, a heat conducting liquid, a hollow cooling system with an outer surface, a hollow chamber through which a heat dissipation liquid is located, and a hollow cavity separate from the hollow chamber, at least one LED, an interface connected to the hollow cooling system and to the at least one LED, and a power supply connected between the electric linker and the interface. | 09-09-2010 |
20100309701 | SYNCHRONOUS RECTIFYING DRIVE CIRCUIT WITH ENERGY FEEDBACK FOR VOLTAGE DOUBLER RECTIFER - A current-driven synchronous rectifying drive circuit designed for a T-type voltage doubler rectifier with an energy feedback circuit including a clamp and energy feedback circuit, a high frequency transformer, a current transducer, an energy storage capacitor, an output capacitor, a first and a second synchronous rectifier, and a first drive circuit connected to the first synchronous rectifier and a second drive circuit connected to the second synchronous rectifier. | 12-09-2010 |
20110001766 | LED Drive Circuit For SCR Dimming - A LED drive circuit for SCR dimming including an external controller configured to receive AC voltage from a power network to convert the AC voltage to an AC voltage with a lacked phase by phase controlling the voltage through a thyristor, and a LED driver that includes a bridge rectifier configured to shape the AC voltage with the lacked phase output into a unidirectional pulse DC voltage, and a phase angle detecting circuit configured to shape the AC voltage signal output with lacked phase from the external controller into a saw-tooth wave pulse signal. | 01-06-2011 |
20110043115 | PWM DIMMING CIRCUIT FOR LED - A PWM dimming circuit for a LED load including a LED load connected to the main LED drive circuit, a current loop configured to measure output current from the LED load, a current loop regulation circuit connected to the current loop, a main control circuit configured to receive a signal from the current loop when the LED load produces an output current, and a PWM dimming controller configured to provide a signal to control the current loop regulation circuit and to make the current loop operate in a closed-loop mode when the LED load produces the output current and to provide a shutdown signal to the main control circuit when the LED load does not produce the output current. When the output current is detected, the main control circuit controls the main LED drive circuit to set its output current at a predetermined load current. | 02-24-2011 |
20110080102 | HIGH EFFICIENCY CONSTANT CURRENT LED DRIVER - The present invention discloses a high efficiency constant current LED driver, which comprises a rectification bridge, a PFC main circuit, an isolated DC/DC converter, a PFC controller and a PFC bus control circuit. Since the input voltage is an intermediate PFC bus voltage, which varies with the output voltage of the DC/DC converter. When the isolated DC/DC converter is an LLC resonant circuit, the operating frequency of the LLC circuit is close to the resonant frequency within a wide output voltage range. Thus, the gain range and the operating frequency is narrow, and can enable the constant current module to work with a high efficiency at a wide output voltage range. When the isolated DC/DC converter is a symmetric half bridge, or an asymmetric half bridge or a full bridge circuit, the duty cycle of DC/DC circuit is close to 50% within a wide output voltage range. Thus, the changing range of the duty cycle of the DC/DC converter will be narrow and can improve the efficiency dramatically. | 04-07-2011 |
20110080115 | CONSTANT CURRENT CONTROL CIRCUIT WITH MULTIPLE OUTPUTS FOR LED DRIVER - A constant current control circuit with multiple outputs for a LED driver, the circuit including a single-output constant current power supply, and multiple output circuits, each output circuit comprising a current sharing circuit, a current sharing control circuit and a LED load. The LED load and the current sharing circuit are in series and form a series loop with a first terminal and a second terminal of the series loop connected to a first output terminal and a second output terminal of the constant current power supply. | 04-07-2011 |
20110080144 | CIRCUIT TO IMPROVE LIGHT LOAD POWER FACTOR OF POWER SUPPLY - A circuit to improve the power factor of a power supply at light load, the circuit including a rectifier bridge, a filter positioned before or after the rectifier bridge, a logic control and power drive circuit, a switching transistor, a light load detecting circuit configured to output a control signal to the logic control and power drive circuit which controls the switching transistor to conduct when a heavy load is experienced and to cut off when a light load is experienced, in order to control the working status of the filter capacitor, and a power factor correction circuit. | 04-07-2011 |
20120274136 | MULTI-PATH CONSTANT CURRENT DRIVING CIRCUIT - A multi-path constant current driving circuit. In the multi-path constant current driving circuit, a current sharing transformer (T | 11-01-2012 |
20120274291 | MULTI-PATH CONSTANT CURRENT DRIVING CIRCUIT - A multi-path constant current drive circuit includes a DC/AC converter, a main transformer and at least two rectifying and filtering units. The main transformer includes at least one assistant side winding with a tap; together with the assistant side winding of the main transformer, each of the at least two rectifying and filtering units respectively forms a power supply loop; each power supply loop includes a first rectifying loop and a second rectifying loop, which are relatively used for the rectification of the positive and the negative half-cycle alternating voltage; a current-equalizing transformer is arranged between the adjacent first power supply loop and second power supply loop, the windings of the current-equalizing transformer are respectively in the rectifying loops contained in the first power supply loop and the second power supply loop, thus realizing the current equalization between the different rectifying loops in which the adjacent rectifying and filtering units are contained. The multi-path constant current drive circuit performs a good current equalization, and can reduce the volume of the current-equalizing transformer and decrease the cost. | 11-01-2012 |
20130088169 | CONSTANT-CURRENT LED DRIVER CIRCUIT AND OUTPUT VOLTAGE ADJUSTABLE CIRCUIT AND METHOD THEREOF - A constant-current Light Emitting Diode (LED) driver circuit is provided, and the circuit includes: an output voltage adjustable circuit and at least one path of LED load, wherein the output voltage adjustable circuit comprises: a switch converting main circuit, an output characteristic parameter sampling circuit, and an output voltage controller. The output voltage controller is used to adjust the output voltage of the switch converting main circuit according to the variation relationship between the sampling signal output by the output characteristic parameter sampling circuit and the output voltage, determine the adjustive direction of the output voltage magnitude of the switch converting main circuit according to the change of the sampling signal, adjust the magnitude of the output voltage of the switch converting main circuit according to the preset step, and finally make the output voltage equal to the voltage of one path of LED load with the highest voltage or the difference between the output voltage and the voltage of one path of LED load voltage with the highest voltage within the predetermined range. The present solution implements reducing the connection complexity and power dissipation on the base of controlling the multi-path constant-current LED. | 04-11-2013 |
20130093348 | METHOD, APPARATUS AND SYSTEM FOR CONTROLLING LIGHT SOURCE - A method, an apparatus and a system for controlling a light source are disclosed. The method comprises: receiving a dimming command, determining the dimming item specified by the dimming command ( | 04-18-2013 |
20130099686 | LIGHT EMITTING DIODE (LED) DIMMING SYSTEM - A Light emitting diode (LED) dimming system comprises a voltage regulating converter, an input of which is connected to a power supply; a constant current module, an output of which is connected to an LED load constituted by one LED light or multiple serial LED lights; the output of the voltage regulating converter is connected with the input of the constant current module via a switch, and the switch is controlled to be on-off by an adjustable pulse signal. The invention has the advantages of high power factor and low electromagnetic interference, and easy implementation, etc. | 04-25-2013 |
20130241433 | METHOD, APPARATUS AND SYSTEM FOR CONTROLLING LIGHT SOURCE - Provided are a method, apparatus and system for controlling a light source. The method comprises: acquiring an adjustment signal and determining a dimming item according to the adjustment signal; the dimming item being composed of the value and/or value range of at least one characteristics parameter of a pulse drive signal; converting the adjustment signal into the pulse drive signal indicated by the dimming item; controlling an adjustment switch by means of the pulse drive signal, so as to output a voltage including a chopped wave voltage corresponding to the dimming item, thereby transmitting adjustment information about the colour and/or brightness of the light source by means of the voltage including the chopped wave voltage. The method, apparatus and system can achieve the function of adjusting the colour and/or brightness of the light source. | 09-19-2013 |
20130271032 | DEVICE AND SYSTEM FOR LOAD DRIVING - A device and system for load driving. The device includes: an electric energy supplying unit including at least two units with output voltage adjustable; a sampling unit, with the input thereof connected to either end of a load unit for sampling the current of that end and sending the sampled current to an output voltage controller; the output voltage controller, with the input thereof connected to the output of the sampling unit for outputting voltage control signal to each unit with output voltage adjustable, according to the sampled current, so as to control the difference between the output voltage of each unit with output voltage adjustable and the maximum load voltage in a load branch to be not greater than a preset difference threshold, with the difference threshold being greater than or equal to zero. The device and system for load driving can improve the reliability of the driving device and can reduce the complexity of the circuit. | 10-17-2013 |
20130285625 | LOAD DRIVING DEVICE AND SYSTEM, LIMITING POINT CONTROL METHOD AND DEVICE - A load driving device and system, and a limiting point control method and device. The load driving device comprising: a voltage/current regulative main circuit placed under the control of an output current controller, for use in conducting a voltage conversion on an input voltage, and in supplying electric power to a subsequent load unit; a sampling unit connected to an output terminal of the main circuit, for use in sampling an output feature parameter of the main circuit; the output current controller, for use in controlling a limiting point of the main circuit, and on the basis of the adjustment direction of the limiting point and on changes of the output feature parameters of the main circuit before and after an adjustment, determining a steady working point for the main circuit, and controlling the main circuit to work at the steady working point. The load driving device and system enable an increase in driver reliability and a reduction in circuit complexity. | 10-31-2013 |
20130320871 | HIGH EFFICIENCY CONSTANT CURRENT LED DRIVER - The present invention discloses a high efficiency constant current LED driver, which comprises a rectification bridge, a PFC main circuit, an isolated DC/DC converter, a PFC controller and a PFC bus control circuit. Since the input voltage is an intermediate PFC bus voltage, which varies with the output voltage of the DC/DC converter. When the isolated DC/DC converter is an LLC resonant circuit, the operating frequency of the LLC circuit is close to the resonant frequency within a wide output voltage range. Thus, the gain range and the operating frequency is narrow, and can enable the constant current module to work with a high efficiency at a wide output voltage range. When the isolated DC/DC converter is a symmetric half bridge, or an asymmetric half bridge or a full bridge circuit, the duty cycle of DC/DC circuit is close to 50% within a wide output voltage range. Thus, the changing range of the duty cycle of the DC/DC converter will be narrow and can improve the efficiency dramatically. | 12-05-2013 |
20140021875 | AUXILIARY POWER SUPPLY CIRCUIT OF TWO WIRE DIMMER - An auxiliary power supply circuit of a two wire dimmer, comprising: an auxiliary source capacitor ( | 01-23-2014 |
20140246987 | CONSTANT CURRENT DRIVE FOR LED LIGHT SOURCE - Disclosed is a constant current drive for an LED light source, including a main power supply loop and at least one backup power supply loop. The main power supply loop at least includes a power conversion circuit. The power conversion circuit outputs a constant current to an LED light source. The backup power supply loop at least includes a power conversion backup circuit. The power conversion backup circuit outputs a constant current to the LED light source. When the power conversion circuit and the power conversion backup circuit operate normally, any one thereof operates in a nominal state or a derating state, and the output ends thereof are connected in parallel and then supply power to the LED light source simultaneously. When any one of the power conversion circuit and the power conversion backup circuit is invalid, the invalid circuit will not affect the normal operation of the remaining circuit. The constant current drive for an LED light source in the present invention can improve the reliability of the constant current drive for an LED light source due to having a backup power supply loop. | 09-04-2014 |