Inventronics (hangzhou), Inc.

Bel Fuse, Inc.

Inventronics (hangzhou) Co., Ltd.

Thinklux (zhejiang) Lighting Technology Co., Ltd.

Bel Power (hangzhou) Co., Ltd.

Inventronics, Inc.

Guichao Hua

Xiaoli Yao

Xinke Wu

Liang'an Ge

Lijun Ren

Liangan Ge

Delai Jiang

Congfeng Zhang

Yi Jiang

Wu Xinke

Luo Changchun

Hao Zhang

Yang Liu

Xiaojun Guo

Ning Zhai

Daifu Xiong

Ya Liu

Hangdong Yu

Wanyu Tang

Kun Lang

Jianhua Zou

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.

Constant current drive for LED light source

An auxiliary power supply circuit of a two wire dimmer, comprising: an auxiliary source capacitor () and a cutoff switch () constituting a series branch, a chopper switch () parallel-connected to the series branch, and a control device () connected to the chopper switch () and to the cutoff switch (). The control device () measures an auxiliary source voltage and receives a chopper voltage control signal (Vg), and outputs signals (Vand V), on the basis of the result of a comparison between the auxiliary source voltage and a preset voltage and of the state of the chopper voltage control signal (Vg), to control the on and off of the chopper switch () and of the cutoff switch () for controlling the charging of the auxiliary source capacitor (). The auxiliary power supply circuit has low losses, high efficiency, and is not limited by minimum chopper angle, and has low electromagnetic interference.

Auxiliary power supply circuit of two wire dimmer

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.

Device and system for load driving

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.

Load driving device and system, limiting point control method and device

A multi-path constant current driving circuit. In the multi-path constant current driving circuit, a current sharing transformer (T, T, T, T(n&#x2212;1)) is provided in power supply circuits which are provided with adjacent rectifier and filter units (Z, Z, Z, Zn). A first winding of the current sharing transformer (T, T, T, T(n&#x2212;1)) is connected between a first terminal of a secondary winding of a first power supply circuit and the rectifier and filter unit (Z, Z, Z, Zn) of the first power supply circuit. A second winding of the current sharing transformer (T, T, T, T(n&#x2212;1)) is connected between a first terminal of a secondary winding of a second power supply circuit and the rectifier and filter unit (Z, Z, Z, Zn) of the second power supply circuit. In-phase current flows through the dotted terminal of the first winding and the synonym terminal of the second winding of the current sharing transformer (T, T, T, T(n&#x2212;1)). The current sharing transformer (T, T, T, T(n&#x2212;1)) is used for sharing the current between the power supply circuits which are provided with the adjacent rectifier and filter units (Z, Z, Z, Zn ). The driving circuit is provided with high current sharing efficiency, a small size and a low cost.

Multi-path constant current driving circuit

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.

Constant-current LED driver circuit and output voltage adjustable circuit and method thereof

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.

High output current split package A/C adapter

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.

High efficiency constant current LED driver

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 conducting 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.

LED lamp system utilizing a hollow liquid-cooled device

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.

Constant current control circuit with multiple outputs for LED driver

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.

Circuit to improve light load power factor of power supply

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.

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.

LED drive circuit for SCR dimming

The invention discloses a hollow, liquid cooling and strip-shaped LED lamp, comprising an LED driver, an LED light source, and LED substrate, a light distributing lampshade, electrical connectors at two ends and a lamp socket. The invention is characterized in that a hollow inner container is set in the light distributing lampshade. The hollow chamber between the hollow inner container and the light distributing lampshade is filled with heat conducting liquid. The LED substrate is immersed in the heat conducting liquid. The invention conducts heat by conduction and convection of the heat conducting liquid, which can obtain good heat radiating effect. Meanwhile, the inner container and the light distributing lampshade form a hollow radiating shell filled with high performance heat conducting liquid, and the hollow radiating shell can be made of light weight materials. Therefore, the radiating shell is light in weight, environmental friendly, durable and low cost. Especially, since the heat conducting liquid fills in the hollow chamber of the hollow radiating shell directly in the invention, the heat radiating effect will be improved and at the same time the volume of the product will not increase.

Hollow, liquid cooling and strip-shaped LED lamp

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.

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Zhejiang, China

Guichao Hua