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    Smart driving method for synchronous rectifier and its apparatus thereof
    6.
    发明授权
    Smart driving method for synchronous rectifier and its apparatus thereof 有权
    同步整流器的智能驱动方法及其装置

    公开(公告)号：US08102680B2

    公开(公告)日：2012-01-24

    申请号：US12429099

    申请日：2009-04-23

    申请人： Yuancheng Ren ,  Junming Zhang ,  Lei Miao ,  Zhaoqi Mao

    发明人： Yuancheng Ren ,  Junming Zhang ,  Lei Miao ,  Zhaoqi Mao

    IPC分类号： H02M3/335

    CPC分类号： H02M3/33592 ,  Y02B70/1475

    摘要： The present invention discloses a smart driving method for a secondary synchronous rectifier of an isolated converter and its apparatus thereof. The apparatus comprises: a main circuit having a secondary synchronous rectifier Q1; a differentiation filter circuit, filtering the drain-source voltage Vds of the secondary synchronous rectifier, comprising a capacitor and at least one resistor connected in series and outputting a filtered voltage Vf from either between said capacitor and said at least one resistor or between said at least one resistor; a smart driver, receiving Vf and Vds and putting out a driving signal to the gate of the secondary synchronous rectifier. The control approach is fulfilled by comparing Vds to a reference voltage Vthr2 and comparing the absolute value of Vf to another reference voltage Vthr3. When Vds Vthr3, Q1 is turned on. When Vds>Vthr1, Q1 is turned off, where Vthr1 is a predetermined reference voltage. The driving is reliable with an additional differentiation filter circuit to eliminate error trigger.

    摘要翻译： 本发明公开了一种用于隔离变换器的次级同步整流器的智能驱动方法及其装置。 该装置包括：具有次级同步整流器Q1的主电路; 微分滤波器电路，对次级同步整流器的漏源电压Vds进行滤波，包括电容器和串联连接的至少一个电阻器，并从所述电容器和所述至少一个电阻器之间或在所述至少一个电阻器之间输出滤波电压Vf 最少一个电阻; 智能驱动器，接收Vf和Vds，并向第二同步整流器的门输出驱动信号。 通过将Vds与参考电压Vthr2进行比较并将Vf的绝对值与另一参考电压Vthr3进行比较来实现控制方法。 当Vds Vthr3时，Q1导通。 当Vds> Vthr1时，Q1截止，其中Vthr1是预定的参考电压。 驱动是可靠的，附加的微分滤波电路可以消除错误触发。

    SMART DRIVING METHOD FOR SYNCHRONOUS RECTIFIER AND ITS APPARATUS THEREOF
    7.
    发明申请
    SMART DRIVING METHOD FOR SYNCHRONOUS RECTIFIER AND ITS APPARATUS THEREOF 有权
    同步整流器的智能驱动方法及其设备

    公开(公告)号：US20090273951A1

    公开(公告)日：2009-11-05

    申请号：US12429099

    申请日：2009-04-23

    申请人： Yuancheng Ren ,  Junming Zhang ,  Lei Miao ,  Zhaoqi Mao

    发明人： Yuancheng Ren ,  Junming Zhang ,  Lei Miao ,  Zhaoqi Mao

    IPC分类号： H02M3/335

    CPC分类号： H02M3/33592 ,  Y02B70/1475

    摘要： The present invention discloses a smart driving method for a secondary synchronous rectifier of an isolated converter and its apparatus thereof. The apparatus comprises: a main circuit having a secondary synchronous rectifier Q1; a differentiation filter circuit, filtering the drain-source voltage Vds of the secondary synchronous rectifier, comprising a capacitor and at least one resistor connected in series and outputting a filtered voltage Vf from either between said capacitor and said at least one resistor or between said at least one resistor; a smart driver, receiving Vf and Vds and putting out a driving signal to the gate of the secondary synchronous rectifier. The control approach is fulfilled by comparing Vds to a reference voltage Vthr2 and comparing the absolute value of Vf to another reference voltage Vthr3. When Vds Vthr3, Q1 is turned on. When Vds>Vthr1, Q1 is turned off, where Vthr1 is a predetermined reference voltage. The driving is reliable with an additional differentiation filter circuit to eliminate error trigger.

    摘要翻译： 本发明公开了一种用于隔离变换器的次级同步整流器的智能驱动方法及其装置。 该装置包括：具有次级同步整流器Q1的主电路; 微分滤波器电路，对次级同步整流器的漏源电压Vds进行滤波，包括电容器和串联连接的至少一个电阻器，并从所述电容器和所述至少一个电阻器之间或在所述至少一个电阻器之间输出滤波电压Vf 最少一个电阻; 智能驱动器，接收Vf和Vds，并向第二同步整流器的门输出驱动信号。 通过将Vds与参考电压Vthr2进行比较并将Vf的绝对值与另一参考电压Vthr3进行比较来实现控制方法。 当Vds Vthr3时，Q1导通。 当Vds> Vthr1时，Q1截止，其中Vthr1是预定的参考电压。 驱动是可靠的，附加的微分滤波电路可以消除错误触发。

    BRIDGELESS PFC CONVERTER AND THE METHOD THEREOF
    8.
    发明申请
    BRIDGELESS PFC CONVERTER AND THE METHOD THEREOF 审中-公开
    无桥PFC转换器及其方法

    公开(公告)号：US20120293141A1

    公开(公告)日：2012-11-22

    申请号：US13474545

    申请日：2012-05-17

    申请人： Bo Zhang ,  Yuancheng Ren ,  Junming Zhang ,  James C. Moyer ,  Eric Yang

    发明人： Bo Zhang ,  Yuancheng Ren ,  Junming Zhang ,  James C. Moyer ,  Eric Yang

    IPC分类号： G05F1/70

    CPC分类号： H02M1/4233 ,  H02M1/083 ,  H02M2001/0054 ,  Y02B70/126 ,  Y02B70/1491

    摘要： A bridgeless PFC (power factor correction) converter with improved efficiency is disclosed. The bridgeless PFC converter comprises: input terminals configured to receive an input AC power supply; an output terminal configured to provide power supply; a high frequency bridge arm comprising a first switch and a third switch coupled between the output terminal and a ground node; a low frequency bridge arm comprising a second switch and a fourth switch coupled between the output terminal and the ground node; an inductor coupled between the input AC power supply and the high frequency bridge arm; and a control circuit configured to control the switching of switches in the high frequency bridge arm and the low frequency bridge arm.

    摘要翻译： 公开了一种提高效率的无桥PFC（功率因数校正）转换器。 所述无桥PFC转换器包括：被配置为接收输入AC电源的输入端; 输出端子，被配置为提供电源; 高频桥臂，包括耦合在输出端和接地节点之间的第一开关和第三开关; 低频桥臂，包括耦合在所述输出端子和所述接地节点之间的第二开关和第四开关; 耦合在输入交流电源和高频桥臂之间的电感器; 以及控制电路，被配置为控制高频桥臂和低频桥臂中的开关的切换。

    Simple protection circuit and adaptive frequency sweeping method for CCFL inverter
    9.
    发明授权
    Simple protection circuit and adaptive frequency sweeping method for CCFL inverter 失效
    CCFL逆变器简单保护电路和自适应扫频方法

    公开(公告)号：US08063570B2

    公开(公告)日：2011-11-22

    申请号：US12166140

    申请日：2008-07-01

    申请人： Junming Zhang ,  Yuancheng Ren ,  Kaiwei Yao ,  Eric Yang

    发明人： Junming Zhang ,  Yuancheng Ren ,  Kaiwei Yao ,  Eric Yang

    IPC分类号： H05B37/02 ,  H05B41/36

    CPC分类号： H05B41/2855

    摘要： A CCFL inverter circuit integrates a feedback circuit and protection circuit together. For both in-phase and out-of-phase applications, sensed lamp voltages can be used for open lamp and short lamp detection and sensed currents can be used for open lamp detection. The driving circuit adjusts the open lamp frequency by using a duty cycle control signal so that the driving circuit can always achieve the desired lamp voltage gain.

    摘要翻译： CCFL逆变电路将反馈电路和保护电路集成在一起。 对于同相和异相应用，感测的灯电压可用于开灯和短灯检测，并且感测电流可用于开灯检测。 驱动电路通过使用占空比控制信号来调节开路频率，使得驱动电路总能达到期望的灯电压增益。

    DUAL ENDED DRIVER CIRCUIT FOR LCD BACKLIGHT AND THE METHOD THEREOF
    10.
    发明申请
    DUAL ENDED DRIVER CIRCUIT FOR LCD BACKLIGHT AND THE METHOD THEREOF 审中-公开
    用于LCD背光的双端驱动电路及其方法

    公开(公告)号：US20100302288A1

    公开(公告)日：2010-12-02

    申请号：US12787974

    申请日：2010-05-26

    申请人： Yuancheng Ren ,  Jiali Cai ,  Lei Du ,  Junming Zhang ,  Eric Yang

    发明人： Yuancheng Ren ,  Jiali Cai ,  Lei Du ,  Junming Zhang ,  Eric Yang

    IPC分类号： G09G5/10

    CPC分类号： H05B41/2825

    摘要： A dual ended driver circuit for a LCD backlight is disclosed. The circuit comprises a master board and a slave board, which provides a first output drive signal and a second output drive signal to either end of a lamp set, respectively. The circuit only uses one control chip to synchronize and make symmetrical the first output drive signal and the second output drive signal.

    摘要翻译： 公开了一种用于LCD背光的双端驱动电路。 该电路包括主板和从属板，其分别向灯组的任一端提供第一输出驱动信号和第二输出驱动信号。 该电路仅使用一个控制芯片来同步和对准第一个输出驱动信号和第二个输出驱动信号。