公开(公告)号：US20120139422A1

公开(公告)日：2012-06-07

申请号：US13371375

申请日：2012-02-10

申请人： Zhimou REN ,  Ching-Chuan KUO ,  Tiesheng YAN ,  Yunning XIE ,  Jun REN

发明人： Zhimou REN ,  Ching-Chuan KUO ,  Tiesheng YAN ,  Yunning XIE ,  Jun REN

IPC分类号： H05B37/02

CPC分类号： H05B33/0815

摘要： Embodiments of the invention provided a driving circuit for powering a light-emitting diode (LED) light source. The driving circuit includes a rectifier, a s filter capacitor, and a control circuit. The rectifier converts an AC voltage from an AC power source to a rectified AC voltage. The filter capacitor coupled to the rectifier filters the rectified AC voltage to provide a DC voltage. The control circuit controls power supplied to the LED light source. The control circuit enables a discharging current periodically to discharge the filter capacitor if a switch coupled between an AC power source and a rectifier is turned off and disables the discharging current if the control circuit determines that the switch is turned on.

摘要翻译： 本发明的实施例提供了一种用于为发光二极管（LED）光源供电的驱动电路。 驱动电路包括整流器，滤波电容器和控制电路。 整流器将AC电压从AC电源转换为整流的AC电压。 耦合到整流器的滤波电容器对整流的AC电压进行滤波以提供DC电压。 控制电路控制提供给LED光源的电力。 如果连接在AC电源和整流器之间的开关被断开并且如果控制电路确定开关导通而禁止放电电流，则控制电路使能放电电流周期性地对滤波电容器放电。

公开(公告)号：US20130300307A1

公开(公告)日：2013-11-14

申请号：US13608273

申请日：2012-09-10

申请人： Zhimou REN ,  Yunning XIE ,  Jun REN ,  Ching-Chuan KUO

发明人： Zhimou REN ,  Yunning XIE ,  Jun REN ,  Ching-Chuan KUO

IPC分类号： H05B37/02

CPC分类号： H05B33/0815 ,  H02M1/4258 ,  Y02B70/126

摘要： A controller for controlling a power converter includes a signal generator and a driver. The power converter receives an input voltage and provides an output voltage to power a load. The signal generator receives a sense signal indicating a current flowing through the power converter, receives a detection signal indicating whether the power converter operates in a predetermined state, and generates a square wave signal according to the sense signal and the detection signal. The square wave signal has a first voltage level proportional to a peak level of the current when the power converter operates in the predetermined state; otherwise, the square wave signal has a second voltage level. The driver generates a driving signal based on the square wave signal to control a current flowing through the load.

摘要翻译： 用于控制功率转换器的控制器包括信号发生器和驱动器。 功率转换器接收输入电压并提供输出电压来为负载供电。 信号发生器接收指示流过功率转换器的电流的感测信号，接收指示功率转换器是否以预定状态工作的检测信号，并根据感测信号和检测信号产生方波信号。 当功率转换器在预定状态下工作时，方波信号具有与电流的峰值电平成比例的第一电压电平; 否则，方波信号具有第二电压电平。 驱动器基于方波信号产生驱动信号，以控制流过负载的电流。

公开(公告)号：US20110133661A1

公开(公告)日：2011-06-09

申请号：US12718210

申请日：2010-03-05

申请人： Zhimou REN ,  Jun REN ,  Yunning XIE ,  Tiesheng YAN ,  Feng LIN

发明人： Zhimou REN ,  Jun REN ,  Yunning XIE ,  Tiesheng YAN ,  Feng LIN

IPC分类号： H05B37/02 ,  H02M3/156

CPC分类号： H05B33/0884 ,  H05B33/0815 ,  H05B33/0851 ,  Y02B20/346

摘要： A power supply system includes a power converter, a switch, and a controller. The power converter is operable for providing power to a load. The switch is coupled to the power converter and is operable for adjusting the power to the load. The switch has a gate, a source and a drain. The controller is coupled to the switch and is operable for controlling a state of the switch. The controller has a first control terminal for providing a gate voltage to the gate of the switch, a second control terminal for providing a source voltage to the source of the switch, and an input terminal for receiving a supply voltage via the source of the switch. The controller is also operable for limiting the supply voltage within a predetermined maximum level by regulating the gate voltage to a preset level.

摘要翻译： 电源系统包括功率转换器，开关和控制器。 功率转换器可操作以向负载提供电力。 开关耦合到功率转换器，并且可操作用于调节负载的功率。 开关有一个门，一个源和一个漏极。 控制器耦合到开关并且可操作用于控制开关的状态。 控制器具有用于向开关的栅极提供栅极电压的第一控制端子，用于向开关源提供源极电压的第二控制端子以及用于经由开关源接收电源电压的输入端子 。 控制器还可操作用于通过将栅极电压调节到预设电平来将电源电压限制在预定最大电平内。

公开(公告)号：US20110140616A1

公开(公告)日：2011-06-16

申请号：US12823269

申请日：2010-06-25

申请人： Tiesheng YAN ,  Zhimou REN ,  Jun REN ,  Ching-Chuan KUO

发明人： Tiesheng YAN ,  Zhimou REN ,  Jun REN ,  Ching-Chuan KUO

IPC分类号： H05B37/00 ,  H05B37/02

CPC分类号： H05B33/0815 ,  H05B33/0821 ,  H05B33/0842 ,  Y02B20/347

摘要： A driving circuit for driving a light source includes a power converter, a controller and a voltage-controlled current source. The power converter is coupled to the light source, and receives an input voltage from a power source and provides an output voltage to the light source. The power converter includes a switch coupled in series with the light source. The controller is coupled to the power converter and controls a power of the light source by controlling the switch. The voltage-controlled current source is coupled to the controller and provides a first current. The controller controls the switch based on the first current.

摘要翻译： 用于驱动光源的驱动电路包括功率转换器，控制器和压控电流源。 功率转换器耦合到光源，并且从电源接收输入电压并向光源提供输出电压。 功率转换器包括与光源串联耦合的开关。 控制器耦合到功率转换器，并通过控制开关来控制光源的功率。 电压控制电流源耦合到控制器并提供第一电流。 控制器根据第一个电流控制开关。

公开(公告)号：US20110080119A1

公开(公告)日：2011-04-07

申请号：US12967933

申请日：2010-12-14

申请人： Tiesheng YAN ,  Ching-Chuan KUO ,  Zhimou REN ,  Jun REN

发明人： Tiesheng YAN ,  Ching-Chuan KUO ,  Zhimou REN ,  Jun REN

IPC分类号： H05B41/36

CPC分类号： H05B33/0815

摘要： A circuit for driving a light source, e.g., an LED light source, includes a converter, a sensor, and a controller. The converter converts an input voltage to an output voltage across the LED light source based upon a driving signal. A duty cycle of the driving signal determines an average current flowing through the LED light source. The sensor is selectively coupled to and decoupled from the converter based upon the driving signal. The sensor generates a sense voltage indicative of a current flowing through the LED light source when the sensor is coupled to the converter. The controller is coupled to the converter and sensor. The controller compares the sense voltage to a reference voltage indicative of a predetermined average current through the LED light source to generate a compensation signal and generates the driving signal based upon the compensation signal. The duty cycle of the driving signal is adjusted based upon the compensation signal to adjust the average current flowing through the LED light source to the predetermined average current.

摘要翻译： 用于驱动例如LED光源的光源的电路包括转换器，传感器和控制器。 转换器基于驱动信号将输入电压转换成LED光源两端的输出电压。 驱动信号的占空比确定流过LED光源的平均电流。 基于驱动信号，传感器选择性地耦合到转换器并从转换器去耦。 当传感器耦合到转换器时，传感器产生指示流过LED光源的电流的感测电压。 控制器耦合到转换器和传感器。 控制器将感测电压与表示通过LED光源的预定平均电流的参考电压进行比较，以产生补偿信号，并基于补偿信号产生驱动信号。 基于补偿信号调整驱动信号的占空比，以将流过LED光源的平均电流调整到预定的平均电流。

公开(公告)号：US20110157923A1

公开(公告)日：2011-06-30

申请号：US12712407

申请日：2010-02-25

申请人： Zhimou REN ,  Jun REN ,  Yunning XIE

发明人： Zhimou REN ,  Jun REN ,  Yunning XIE

IPC分类号： H02M3/335

CPC分类号： H02M3/33507

摘要： A power converter includes a transformer operated in multiple switching cycles. At least one switching cycle includes a charging period, a discharging period, and an adjusting period. The transformer has a primary winding coupled to a power source and a secondary winding coupled to a load. During the charging period the transformer is powered by the power source and a current flowing through the primary winding increases. During the discharging period the transformer discharges to power the load and a current flowing through the secondary winding decreases. A ratio of a duration of the discharging period to a total duration of the charging period, the discharging period and the adjusting period is constant.

摘要翻译： 功率转换器包括在多个开关周期中工作的变压器。 至少一个开关周期包括充电周期，放电周期和调整周期。 变压器具有耦合到电源的初级绕组和耦合到负载的次级绕组。 在充电期间，变压器由电源供电，流过初级绕组的电流增加。 在放电期间，变压器放电给负载供电，流过次级绕组的电流减小。 放电期间的持续时间与充电期间的总持续时间，放电期间和调整期间的比率恒定。