公开(公告)号：US20090187925A1

公开(公告)日：2009-07-23

申请号：US12007968

申请日：2008-01-17

申请人： Yuequan Hu ,  Milan M. Jovanovic ,  Colin Weng

发明人： Yuequan Hu ,  Milan M. Jovanovic ,  Colin Weng

IPC分类号： G09G3/36

CPC分类号： H05B33/0827 ,  H05B33/0815 ,  H05B33/0818 ,  Y02B20/347

摘要： A light-emitting diode (LED) driver according to the present invention consists of a voltage pre-regulator and multiple linear current regulators with an adaptively-controlled drive voltage. In this LED driver, the efficiency maximization is achieved by eliminating the sensing of the voltage drops across the linear regulators, i.e., by removing the external voltage feedback for the adjustment of the output voltage of the pre-regulator. In the LED driver of the present invention, the self-adjustment of drive voltage is achieved by relying on a relatively strong dependence between the gate-to-source and drain-to-source voltages of a current-regulating transistor, e.g., a MOSFET, operating in the linear region. The driver powers all LEDs in a string with a constant current and provides consistent illumination and optimum operating efficiency at low cost over a wide range of input/output voltage and temperature.

摘要翻译： 根据本发明的发光二极管（LED）驱动器由电压预调节器和具有自适应控制的驱动电压的多个线性电流调节器组成。 在该LED驱动器中，通过消除对线性调节器两端的电压降的感测，即通过去除用于调节预调节器的输出电压的外部电压反馈来实现效率最大化。 在本发明的LED驱动器中，驱动电压的自调节是通过依赖于电流调节晶体管的栅极至源极和漏极至源极之间的相对较强的依赖性来实现的，例如MOSFET ，在线性区域中运行。 驱动器为恒定电流的串中的所有LED供电，并在宽范围的输入/输出电压和温度下以低成本提供一致的照明和最佳的工作效率。

公开(公告)号：US20100253234A1

公开(公告)日：2010-10-07

申请号：US12416687

申请日：2009-04-01

申请人： Yuequan Hu ,  Milan M. Jovanovic

发明人： Yuequan Hu ,  Milan M. Jovanovic

IPC分类号： H05B41/04

CPC分类号： H05B41/2881 ,  H05B41/388

摘要： The current invention provides a power supply that includes an igniter that generates an ignition voltage for igniting a DC lamp; an auxiliary power stage that outputs an auxiliary voltage for sustaining sufficient current in the DC lamp after the DC lamp is ignited; a voltage conversion stage coupled to the auxiliary power stage and generating a voltage at a level that is higher than the auxiliary voltage; and a switch that couples the auxiliary voltage to the DC lamp and the voltage conversion stage for a predefined period of time.

摘要翻译： 本发明提供了一种电源，其包括产生用于点燃DC灯的点火电压的点火器; 辅助功率级，其在DC灯点燃之后输出用于在DC灯中维持足够电流的辅助电压; 电压转换级，耦合到辅助功率级，并产生高于辅助电压的电平; 以及将辅助电压耦合到DC灯和电压转换级一段预定时间段的开关。

公开(公告)号：US07271545B2

公开(公告)日：2007-09-18

申请号：US11245445

申请日：2005-10-07

申请人： Yuequan Hu ,  Milan M. Jovanović ,  Yuan Chao Niu ,  Colin Weng

发明人： Yuequan Hu ,  Milan M. Jovanović ,  Yuan Chao Niu ,  Colin Weng

IPC分类号： H05B37/02 ,  H03L7/06

CPC分类号： H05B41/2881

摘要： A ballast according to the present invention operates in an ignition state, a warm-up state, and a steady state for igniting and powering a lamp. The ballast comprises an igniter that ignites the lamp during the ignition state and a switching power inverter, for example, a full bridge DC-AC inverter implemented with MOSFET switching transistors, that powers the lamp during the warm-up and steady states. The switching power inverter, which drives the igniter, operates at a first switching frequency during the ignition state and operates at a second switching frequency during the steady state. Preferably, the first switching frequency, which in one exemplary embodiment is in the kHz range, is higher than the second switching frequency.

公开(公告)号：US06714428B2

公开(公告)日：2004-03-30

申请号：US10107733

申请日：2002-03-26

申请人： Guisong Huang ,  Yilei Gu ,  Yuequan Hu ,  Alpha J. Zhang ,  Jack Hsiao

发明人： Guisong Huang ,  Yilei Gu ,  Yuequan Hu ,  Alpha J. Zhang ,  Jack Hsiao

IPC分类号： H02M542

CPC分类号： H02M3/33592 ,  Y02B70/1475

摘要： An active clamped-mode DC-to-DC converter with synchronous rectifiers and a combined transformer-inductor device is provided. The power converter includes a combined transformer-inductor device having a primary winding, a secondary winding, and an auxiliary winding where the primary and the secondary windings perform a transformer function and the auxiliary winding performs an output filter function, a switching circuit for periodically providing a positive voltage to the primary winding and a negative voltage to reset the primary winding, and a synchronous rectification circuit connected for enabling conduction from the secondary winding to an output port in which the auxiliary winding is coupled between the output port and the synchronous rectification circuit for providing an inductance to filter an output signal.

摘要翻译： 提供具有同步整流器和组合变压器 - 电感器装置的有源钳位模式DC-DC转换器。 功率转换器包括具有初级绕组，次级绕组和辅助绕组的组合变压器 - 电感器装置，其中初级绕组和次级绕组执行变压器功能，并且辅助绕组执行输出滤波器功能，用于周期性地提供 对初级绕组施加正电压和负电压以复位初级绕组;以及同步整流电路，其连接用于使得能够从次级绕组传导到输出端口，其中辅助绕组耦合在输出端口和同步整流电路之间 用于提供电感以对输出信号进行滤波。

公开(公告)号：US20130300310A1

公开(公告)日：2013-11-14

申请号：US13596696

申请日：2012-08-28

申请人： Yuequan Hu

发明人： Yuequan Hu

IPC分类号： H05B37/02

CPC分类号： H05B33/0854 ,  H05B33/0815

摘要： A light emitting diode (LED) driver circuit that generates current for driving an LED load includes a voltage converter circuit configured to supply a drive current to the LED load in response to a control signal, a control circuit that generates the control signal, and a bias voltage generating circuit that generates the bias voltage for the control circuit. The bias voltage generating circuit is galvanically isolated from a power supply voltage and from the LED load. The voltage converter circuit regulates a level of the drive current supplied to the LED load in response to the control signal.

摘要翻译： 产生用于驱动LED负载的电流的发光二极管（LED）驱动电路包括电压转换器电路，其被配置为响应于控制信号向LED负载提供驱动电流，产生控制信号的控制电路和 产生用于控制电路的偏置电压的偏置电压产生电路。 偏置电压产生电路与电源电压和LED负载电隔离。 电压转换器电路响应于控制信号调节提供给LED负载的驱动电流的电平。

公开(公告)号：US08975825B2

公开(公告)日：2015-03-10

申请号：US13596696

申请日：2012-08-28

申请人： Yuequan Hu

发明人： Yuequan Hu

IPC分类号： H05B37/02

CPC分类号： H05B33/0854 ,  H05B33/0815

摘要： A light emitting diode (LED) driver circuit that generates current for driving an LED load includes a voltage converter circuit configured to supply a drive current to the LED load in response to a control signal, a control circuit that generates the control signal, and a bias voltage generating circuit that generates the bias voltage for the control circuit. The bias voltage generating circuit is galvanically isolated from a power supply voltage and from the LED load. The voltage converter circuit regulates a level of the drive current supplied to the LED load in response to the control signal.

摘要翻译： 产生用于驱动LED负载的电流的发光二极管（LED）驱动电路包括电压转换器电路，其被配置为响应于控制信号向LED负载提供驱动电流，产生控制信号的控制电路和 产生用于控制电路的偏置电压的偏置电压产生电路。 偏置电压产生电路与电源电压和LED负载电隔离。 电压转换器电路响应于控制信号调节提供给LED负载的驱动电流的电平。

公开(公告)号：US08432104B2

公开(公告)日：2013-04-30

申请号：US12964075

申请日：2010-12-09

申请人： Yuequan Hu ,  Milan Jovanovic

发明人： Yuequan Hu ,  Milan Jovanovic

IPC分类号： H05B41/16

CPC分类号： H05B33/0818 ,  H05B33/0827

摘要： A load current balancing circuit that operates with a direct current (DC) power supply includes at least one transformer having a first inductive element adapted to couple in series with a first load and a second inductive element adapted to couple in series with a second load. The first load is parallel to the second load. The load balancing circuit further includes at least one switch adapted to operate at one or more switching frequencies associated with at least one driving signal. The switch is configured to periodically interrupt respective current flows through the first inductive element and second inductive element substantially simultaneously.

摘要翻译： 用直流（DC）电源工作的负载电流平衡电路包括至少一个变压器，其具有适于与第一负载串联耦合的第一电感元件和适于与第二负载串联耦合的第二电感元件。 第一个负载平行于第二个负载。 负载平衡电路还包括适于在与至少一个驱动信号相关联的一个或多个开关频率下操作的至少一个开关。 该开关被配置为周期性地基本上同时地中断穿过第一电感元件和第二电感元件的相应电流。

公开(公告)号：US08274236B2

公开(公告)日：2012-09-25

申请号：US12416687

申请日：2009-04-01

申请人： Yuequan Hu ,  Milan M. Jovanović

发明人： Yuequan Hu ,  Milan M. Jovanović

IPC分类号： H03B41/04

CPC分类号： H05B41/2881 ,  H05B41/388

摘要： The current invention provides a power supply that includes an igniter that generates an ignition voltage for igniting a DC lamp; an auxiliary power stage that outputs an auxiliary voltage for sustaining sufficient current in the DC lamp after the DC lamp is ignited; a voltage conversion stage coupled to the auxiliary power stage and generating a voltage at a level that is higher than the auxiliary voltage; and a switch that couples the auxiliary voltage to the DC lamp and the voltage conversion stage for a predefined period of time.

摘要翻译： 本发明提供了一种电源，其包括产生用于点燃DC灯的点火电压的点火器; 辅助功率级，其在DC灯点燃之后输出用于在DC灯中维持足够电流的辅助电压; 电压转换级，耦合到辅助功率级，并产生高于辅助电压的电平; 以及将辅助电压耦合到DC灯和电压转换级一段预定时间段的开关。

公开(公告)号：US08120457B2

公开(公告)日：2012-02-21

申请号：US12757296

申请日：2010-04-09

申请人： Yuequan Hu ,  Laszlo Huber ,  Milan Jovanović

发明人： Yuequan Hu ,  Laszlo Huber ,  Milan Jovanović

IPC分类号： H01F17/06

CPC分类号： H01F29/14 ,  H01F2029/143

摘要： A variable inductor comprises one or more magnetic cores providing magnetic flux paths. An inductor coil is wound around one or more inductor sections of the one or more magnetic cores. An inductor magnetic flux flows through one or more closed flux paths along the inductor sections of the magnetic core. A control coil is wound around one or more control sections of the one or more magnetic cores. A control magnetic flux flows through one or more closed flux paths along the control sections of the magnetic core. Under this arrangement, the inductor magnetic flux substantially does not flow through the control sections of the magnetic core and the control magnetic flux substantially does not flow through the inductor sections of the magnetic core. The closed flux paths associated with the inductor magnetic flux and the closed flux paths associated with the control magnetic flux share one or more common sections of the magnetic core not including the control sections and inductor sections. The inductance of said variable inductor is varied by varying said control magnetic flux.

摘要翻译： 可变电感器包括提供磁通路径的一个或多个磁芯。 电感线圈缠绕在一个或多个磁芯的一个或多个电感器部分上。 电感器磁通量沿着磁芯的电感器部分流过一个或多个闭合磁通路径。 控制线圈缠绕在一个或多个磁芯的一个或多个控制部分上。 控制磁通量沿着磁芯的控制部分流过一个或多个闭合磁通路径。 在这种布置下，电感磁通量基本上不流过磁芯的控制部分，并且控制磁通量基本上不会流过磁芯的电感器部分。 与电感器磁通相关联的封闭磁通路径和与控制磁通相关联的闭合磁通路径共享磁芯的一个或多个公共部分，不包括控制部分和电感器部分。 通过改变所述控制磁通来改变所述可变电感器的电感。

公开(公告)号：US20070159116A1

公开(公告)日：2007-07-12

申请号：US11713602

申请日：2007-03-05

申请人： Yuequan Hu ,  Milan Jovanovic ,  Yuan Niu ,  Colin Weng

发明人： Yuequan Hu ,  Milan Jovanovic ,  Yuan Niu ,  Colin Weng

IPC分类号： H05B41/16

CPC分类号： H05B41/2881

摘要： A ballast according to the present invention operates in an ignition state, a warm-up state, and a steady state for igniting and powering a lamp. The ballast comprises an igniter that ignites the lamp during the ignition state and a switching power inverter, for example, a full bridge DC-AC inverter implemented with MOSFET switching transistors, that powers the lamp during the warm-up and steady states. The switching power inverter, which drives the igniter, operates at a first switching frequency during the ignition state and operates at a second switching frequency during the steady state. Preferably, the first switching frequency, which in one exemplary embodiment is in the kHz range, is higher than the second switching frequency.