公开(公告)号：US20090322235A1

公开(公告)日：2009-12-31

申请号：US12494832

申请日：2009-06-30

Applicant: Shian-Sung Shiu ,  Chung-Che Yu ,  JuanJuan Liu

Inventor： Shian-Sung Shiu ,  Chung-Che Yu ,  JuanJuan Liu

IPC: H05B37/02

CPC classification number: H05B33/0845

Abstract: An LED driving circuit is used for dimming by switching between an operating current and a maintaining current or by voltage clamping of a source/drain of MOSFET that is coupled to the LED module. When the LED module is dimmed off, the voltage across the LED module can be kept at a value around a lighting threshold voltage of the LED module that is a minimum voltage for lighting the LED module. Therefore, a voltage difference between the drain and the source of MOSFET coupled to the LED module is smaller than that in the conventional arts. Hence, a withstand voltage of MOSFET can be reduced, and cost of the LED driving circuit as well as the power consumption of MOSFET can be lessened, thereby improving integral efficiency of the circuit.

Abstract translation: LED驱动电路用于通过在工作电流和维持电流之间进行调光，或通过耦合到LED模块的MOSFET的源极/漏极的电压钳位来进行调光。 当LED模块变暗时，LED模块上的电压可以保持在LED模块的照明阈值电压附近的值，LED模块的亮度阈值电压是用于点亮LED模块的最小电压。 因此，耦合到LED模块的MOSFET的漏极和源极之间的电压差小于常规技术中的电压差。 因此，可以降低MOSFET的耐压，并且可以降低LED驱动电路的成本以及MOSFET的功耗，从而提高电路的积分效率。

公开(公告)号：US07531970B2

公开(公告)日：2009-05-12

申请号：US11385536

申请日：2006-03-20

Applicant: Chung-Che Yu ,  Chien-Pang Hung ,  Chih-Shun Lee ,  Chin-Fa Kao

Inventor： Chung-Che Yu ,  Chien-Pang Hung ,  Chih-Shun Lee ,  Chin-Fa Kao

IPC: G05F1/00

CPC classification number: H05B41/2828 ,  H05B41/2824 ,  H05B41/2855 ,  H05B41/2856 ,  Y02B20/186 ,  Y10S315/07

Abstract: A controller for a driving circuit of power source comprises a frequency generator, a pulse width modulator, and a driving device. The frequency generator comprises a latch circuit. The frequency generator provides a pulse signal at a first frequency after the controller is started. After the frequency generator receives an indicating signal, the frequency generator changes the frequency of pulse signal from the first frequency to a second frequency and locks the frequency of pulse signal at the second frequency. The pulse width modulator provides a PWM signal according to the pulse signal and a feedback signal which indicates a status of electric power supply of the driving circuit. The driving device controls semiconductor switches according to the PWM signal.

Abstract translation: 用于电源驱动电路的控制器包括频率发生器，脉宽调制器和驱动装置。 频率发生器包括一个锁存电路。 频率发生器在控制器启动后以第一个频率提供脉冲信号。 在频率发生器接收到指示信号之后，频率发生器将脉冲信号的频率从第一频率改变到第二频率，并将脉冲信号的频率锁定在第二频率。 脉冲宽度调制器根据脉冲信号提供PWM信号，并提供指示驱动电路的电力供应状态的反馈信号。 驱动装置根据PWM信号控制半导体开关。

公开(公告)号：US07397195B2

公开(公告)日：2008-07-08

申请号：US11164316

申请日：2005-11-17

Applicant: Chung-Che Yu ,  Li-Min Lee

Inventor： Chung-Che Yu ,  Li-Min Lee

IPC: G05F1/00

CPC classification number: H05B33/0857 ,  H05B33/0818

Abstract: A control circuit for LEDs is adapted for controlling brightness of a plurality of LEDs as light source in an LCD. The control circuit comprises a control pulse generator and a plurality of LED direct current supplies. The control pulse generator is used for receiving a brightness adjusting signal and generating a plurality of brightness control pulse signals having the same frequency but different phases according to the brightness control signals. The work cycle of the brightness control pulse signal varies in a predetermined range according to the brightness control signal. The LED direct current provider is coupled to the control pulse generator to drive the corresponding LED according to the brightness pulse signal.

Abstract translation: 用于LED的控制电路适于控制作为LCD中的光源的多个LED的亮度。 控制电路包括控制脉冲发生器和多个LED直流电源。 控制脉冲发生器用于接收亮度调节信号，并根据亮度控制信号产生具有相同频率但不同相位的多个亮度控制脉冲信号。 亮度控制脉冲信号的工作周期根据亮度控制信号在预定范围内变化。 LED直流提供器耦合到控制脉冲发生器，以根据亮度脉冲信号驱动相应的LED。

公开(公告)号：US20080122551A1

公开(公告)日：2008-05-29

申请号：US11609908

申请日：2006-12-13

Applicant: Li-Min Lee ,  Chung-Che Yu ,  Chih-Shun Lee

Inventor： Li-Min Lee ,  Chung-Che Yu ,  Chih-Shun Lee

IPC: H03K7/08

CPC classification number: H03K7/08 ,  H02M3/156 ,  H03F2200/351

Abstract: An apparatus for generating a pulse width modulated (PWM) signal to control a transforming circuit to drive a loading is provided. The apparatus includes an error signal generator, a control circuit and a comparator. The error signal generator includes a first input terminal for receiving a reference voltage, a second input terminal for receiving a feedback signal generated based on an operating state of the loading respectively, and an output terminal for outputting an error status signal. The comparator includes a first input terminal for receiving the error status signal, a second input terminal for receiving a compare signal, and an output terminal for generating the PWM signal. The control circuit determines whether to provide a setting signal coupled to the output terminal of the error signal generator based on at least one control signal.

Abstract translation: 提供一种用于产生脉宽调制（PWM）信号以控制变换电路以驱动负载的装置。 该装置包括误差信号发生器，控制电路和比较器。 误差信号发生器包括用于接收参考电压的第一输入端子，用于分别接收基于负载运行状态产生的反馈信号的第二输入端子和用于输出错误状态信号的输出端子。 比较器包括用于接收误差状态信号的第一输入端子，用于接收比较信号的第二输入端子和用于产生PWM信号的输出端子。 控制电路基于至少一个控制信号来确定是否提供耦合到误差信号发生器的输出端的设置信号。

公开(公告)号：US20070222739A1

公开(公告)日：2007-09-27

申请号：US11309019

申请日：2006-06-09

Applicant: Chung-Che Yu ,  Li-Min Lee ,  Chin-Fa Kao

Inventor： Chung-Che Yu ,  Li-Min Lee ,  Chin-Fa Kao

IPC: G09G3/36

CPC classification number: G09G3/3406 ,  G09G2320/064 ,  G09G2330/04 ,  H05B33/0818 ,  H05B33/0851 ,  H05B33/0887 ,  Y02B20/341 ,  Y02B20/346

Abstract: A driving circuit for a plurality of light-emitting diodes (LEDs) comprises a transformer, a driving module, and a protection module. The transformer has a primary coil and a secondary coil, wherein a first end of the primary coil is coupled to a voltage source. Furthermore, a second end of the primary coil of the transformer is coupled to the driving module. The driving module determines whether to deliver electrical power to the transformer according to a pulse-width modulation (PWM) signal and an error signal. The protection module is coupled to the secondary coil. When a driving voltage output by the transformer to the LEDs is less than a first preset voltage or greater than a second preset voltage, the protection module generates the error signal to the driving module.

Abstract translation: 用于多个发光二极管（LED）的驱动电路包括变压器，驱动模块和保护模块。 变压器具有初级线圈和次级线圈，其中初级线圈的第一端耦合到电压源。 此外，变压器的初级线圈的第二端耦合到驱动模块。 驱动模块根据脉冲宽度调制（PWM）信号和误差信号来确定是否向变压器传送电力。 保护模块耦合到次级线圈。 当变压器向LED输出的驱动电压小于第一预设电压或大于第二预置电压时，保护模块产生到驱动模块的误差信号。

公开(公告)号：US20070126373A1

公开(公告)日：2007-06-07

申请号：US11385536

申请日：2006-03-20

Applicant: Chung-Che Yu ,  Chien-Pang Hung ,  Chih-Shun Lee ,  Chin-Fa Kao

Inventor： Chung-Che Yu ,  Chien-Pang Hung ,  Chih-Shun Lee ,  Chin-Fa Kao

IPC: H05B41/36

CPC classification number: H05B41/2828 ,  H05B41/2824 ,  H05B41/2855 ,  H05B41/2856 ,  Y02B20/186 ,  Y10S315/07

Abstract: A controller for a driving circuit of power source comprises a frequency generator, a pulse width modulator, and a driving device. The frequency generator comprises a latch circuit. The frequency generator provides a pulse signal at a first frequency after the controller is started. After the frequency generator receives an indicating signal, the frequency generator changes the frequency of pulse signal from the first frequency to a second frequency and locks the frequency of pulse signal at the second frequency. The pulse width modulator provides a PWM signal according to the pulse signal and a feedback signal which indicates a status of electric power supply of the driving circuit. The driving device controls semiconductor switches according to the PWM signal.

Abstract translation: 用于电源驱动电路的控制器包括频率发生器，脉宽调制器和驱动装置。 频率发生器包括一个锁存电路。 频率发生器在控制器启动后以第一个频率提供脉冲信号。 在频率发生器接收到指示信号之后，频率发生器将脉冲信号的频率从第一频率改变到第二频率，并将脉冲信号的频率锁定在第二频率。 脉冲宽度调制器根据脉冲信号提供PWM信号，并提供指示驱动电路的电力供应状态的反馈信号。 驱动装置根据PWM信号控制半导体开关。

公开(公告)号：US20070029946A1

公开(公告)日：2007-02-08

申请号：US11164316

申请日：2005-11-17

Applicant: Chung-Che Yu ,  Li Lee

Inventor： Chung-Che Yu ,  Li Lee

IPC: H05B41/36

CPC classification number: H05B33/0857 ,  H05B33/0818

Abstract: A control circuit for LEDs is adapted for controlling brightness of a plurality of LEDs as light source in an LCD. The control circuit comprises a control pulse generator and a plurality of LED direct current supplies. The control pulse generator is used for receiving a brightness adjusting signal and generating a plurality of brightness control pulse signals having the same frequency but different phases according to the brightness control signals. The work cycle of the brightness control pulse signal varies in a predetermined range according to the brightness control signal. The LED direct current provider is coupled to the control pulse generator to drive the corresponding LED according to the brightness pulse signal.

Abstract translation: 用于LED的控制电路适于控制作为LCD中的光源的多个LED的亮度。 控制电路包括控制脉冲发生器和多个LED直流电源。 控制脉冲发生器用于接收亮度调节信号，并根据亮度控制信号产生具有相同频率但不同相位的多个亮度控制脉冲信号。 亮度控制脉冲信号的工作周期根据亮度控制信号在预定范围内变化。 LED直流提供器耦合到控制脉冲发生器，以根据亮度脉冲信号驱动相应的LED。

公开(公告)号：US07148633B2

公开(公告)日：2006-12-12

申请号：US10968857

申请日：2004-10-18

Applicant: Chung-che Yu ,  Shih-chung Huang ,  Chien-pang Hung ,  Chih-shun Lee

Inventor： Chung-che Yu ,  Shih-chung Huang ,  Chien-pang Hung ,  Chih-shun Lee

IPC: H05B37/02

CPC classification number: H02M7/53871 ,  H05B41/2825 ,  H05B41/2828 ,  Y02B20/186 ,  Y02B70/1441

Abstract: A DC/AC inverter provided for transforming a DC voltage source into an AC power source, wherein the AC signal is used for driving a fluorescent lamp. The inverter comprises a half-bridge switch circuitry electrically connected to the DC voltage source for outputting an AC signal, a resonant tank electrically connected between the half-bridge switch circuitry and the fluorescent lamp, for stepping up and filtering the AC signal into a high-voltage AC power source which is supplied to a load, and a controller feeding back an output of the fluorescent lamp, providing a pulse width modulation signal for turning on and off the half-bridge switch circuitry, such that the fluorescent lamp can operate consistently and provide a consistent brightness.

Abstract translation: 一种DC / AC逆变器，用于将DC电压源变换为AC电源，其中AC信号用于驱动荧光灯。 逆变器包括电连接到DC电压源的半桥开关电路，用于输出AC信号，电连接在半桥开关电路和荧光灯之间的谐振槽，用于将AC信号升压和滤波成高电平 提供给负载的电压AC电源，以及控制器反馈荧光灯的输出的控制器，提供用于打开和关闭半桥开关电路的脉宽调制信号，使得荧光灯可以一致地操作 并提供一致的亮度。