公开(公告)号：US06771521B1

公开(公告)日：2004-08-03

申请号：US10371449

申请日：2003-02-20

申请人： Yahong Xiong ,  Zhongwei Ke ,  Alpha J. Zhang

发明人： Yahong Xiong ,  Zhongwei Ke ,  Alpha J. Zhang

IPC分类号： H02H7125

CPC分类号： H02M1/34 ,  H02M3/33592 ,  H02M2001/342 ,  Y02B70/1475 ,  Y02B70/1491

摘要： The invention relates to an active snubber for synchronous rectifier. The active snubber is coupled across a synchronous rectifier having a first synchronous MOSFET and a second synchronous MOSFET coupled to a transformer in a power converter. The active snubber includes a series-coupled active switch and first snubber capacitor which is coupled between a drain terminal and a source terminal of the first synchronous MOSFET, a gate driver operative to keep the active switch conducting a specified period of time during a non-conduction interval of the first synchronous MOSFET. The gate driver is composed of an auxiliary winding, a capacitor, and a resistor, wherein the auxiliary winding and the capacitor are connected in series and then coupled across the resistor in parallel, which is coupled between a gate and a source of the active switch.

摘要翻译： 本发明涉及用于同步整流器的有源缓冲器。 有源缓冲器耦合在同步整流器上，该同步整流器具有耦合到功率转换器中的变压器的第一同步MOSFET和第二同步MOSFET。 有源缓冲器包括耦合在第一同步MOSFET的漏极端子和源极端子之间的串联耦合的有源开关和第一缓冲电容器，栅极驱动器可操作以使有源开关在非易失性存储器中保持特定的时间段， 第一同步MOSFET的导通间隔。 栅极驱动器由辅助绕组，电容器和电阻器组成，其中辅助绕组和电容器串联连接，然后并联耦合在电阻器两端，耦合在有源开关的栅极和源极之间 。

公开(公告)号：US06947297B2

公开(公告)日：2005-09-20

申请号：US10679721

申请日：2003-10-04

申请人： Zhongwei Ke ,  Yahong Xiong ,  Bin Jin ,  Alpha J. Zhang

发明人： Zhongwei Ke ,  Yahong Xiong ,  Bin Jin ,  Alpha J. Zhang

IPC分类号： H02M1/34 ,  H02M3/335

CPC分类号： H02M1/34 ,  H02M3/33569 ,  H02M2001/342 ,  Y02B70/1433 ,  Y02B70/1491

摘要： The present invention proposes an improved circuit design and configuration of a DC-DC converter with resonant reset. In this present invention, the active resonant snubber in parallel to a primary winding of a transformer of a DC-DC converter for resetting the transformer includes a resonant capacitor, an active switch connected to the resonant capacitor in series, an auxiliary diode coupled across the active switch in parallel, and an auxiliary winding coupled with the transformer. When a main switch of the DC-DC converter is turned off, the auxiliary winding turns on the active switch, and then the transformer is reset by a resonance between a magnetizing inductor of the transformer and the resonant capacitor.

摘要翻译： 本发明提出了具有谐振复位的DC-DC转换器的改进的电路设计和配置。 在本发明中，与用于复位变压器的DC-DC转换器的变压器的初级绕组并联的有源谐振缓冲器包括谐振电容器，串联连接到谐振电容器的有源开关，辅助二极管 有源开关并联，以及与变压器耦合的辅助绕组。 当DC-DC转换器的主开关关闭时，辅助绕组接通有源开关，然后变压器由变压器的励磁电感器和谐振电容器之间的谐振复位。

公开(公告)号：US07006364B2

公开(公告)日：2006-02-28

申请号：US10801899

申请日：2004-03-15

申请人： Bin Jin ,  Zhongwei Ke ,  Yahong Xiong ,  Alpha J. Zhang

发明人： Bin Jin ,  Zhongwei Ke ,  Yahong Xiong ,  Alpha J. Zhang

IPC分类号： H02M3/335

CPC分类号： H02M1/34 ,  H02M1/08 ,  H02M3/335 ,  H02M2001/342 ,  Y02B70/1491

摘要： A driving circuit comprises an input terminal receiving an input of a PWM signal, a first output terminal connected to a main switch for outputting a low-side driving signal, a second output terminal connected to an active switch for outputting a high-side driving signal, a first branch having a voltage level shifting capacitor and a first buffer connected in series between the input terminal and the second output terminal; and a second branch having a delay circuit and a second buffer connected in series between the input terminal and the first output terminal. When the input of the PWM signal turns from a low level to a high level, the voltage level shifting capacitor transmits the input of PWM signal to the first buffer for turning off the active switch and then triggering the second buffer to turn on the main switch with a short time delay.

摘要翻译： 驱动电路包括接收PWM信号的输入的输入端子，连接到用于输出低侧驱动信号的主开关的第一输出端子，连接到用于输出高侧驱动信号的有源开关的第二输出端子 ，具有电压电平移位电容器和在所述输入端子和所述第二输出端子之间串联连接的第一缓冲器的第一分支; 以及第二分支，具有在输入端子和第一输出端子之间串联连接的延迟电路和第二缓冲器。 当PWM信号的输入从低电平变为高电平时，电压电平移位电容器将PWM信号的输入发送到第一缓冲器，用于关断有源开关，然后触发第二缓冲器以接通主开关 短时间延迟。

公开(公告)号：US20050201128A1

公开(公告)日：2005-09-15

申请号：US10801899

申请日：2004-03-15

申请人： Bin Jin ,  Zhongwei Ke ,  Yahong Xiong ,  Alpha Zhang

发明人： Bin Jin ,  Zhongwei Ke ,  Yahong Xiong ,  Alpha Zhang

IPC分类号： H02H7/122

CPC分类号： H02M1/34 ,  H02M1/08 ,  H02M3/335 ,  H02M2001/342 ,  Y02B70/1491

摘要： A driving circuit comprises an input terminal receiving an input of a PWM signal, a first output terminal connected to a main switch for outputting a low-side driving signal, a second output terminal connected to an active switch for outputting a high-side driving signal, a first branch having a voltage level shifting capacitor and a first buffer connected in series between the input terminal and the second output terminal; and a second branch having a delay circuit and a second buffer connected in series between the input terminal and the first output terminal. When the input of the PWM signal turns from a low level to a high level, the voltage level shifting capacitor transmits the input of PWM signal to the first buffer for turning off the active switch and then triggering the second buffer to turn on the main switch with a short time delay.

摘要翻译： 驱动电路包括接收PWM信号的输入的输入端子，连接到用于输出低侧驱动信号的主开关的第一输出端子，连接到用于输出高侧驱动信号的有源开关的第二输出端子 ，具有电压电平移位电容器和在所述输入端子和所述第二输出端子之间串联连接的第一缓冲器的第一分支; 以及第二分支，具有在输入端子和第一输出端子之间串联连接的延迟电路和第二缓冲器。 当PWM信号的输入从低电平变为高电平时，电压电平移位电容器将PWM信号的输入发送到第一缓冲器，用于关断有源开关，然后触发第二缓冲器以接通主开关 短时间延迟。

公开(公告)号：US20050073861A1

公开(公告)日：2005-04-07

申请号：US10679721

申请日：2003-10-04

申请人： Zhongwei Ke ,  Yahong Xiong ,  Bin Jin ,  Alpha Zhang

发明人： Zhongwei Ke ,  Yahong Xiong ,  Bin Jin ,  Alpha Zhang

IPC分类号： H02M1/34 ,  H02M3/335

CPC分类号： H02M1/34 ,  H02M3/33569 ,  H02M2001/342 ,  Y02B70/1433 ,  Y02B70/1491

摘要： The present invention proposes an improved circuit design and configuration of a DC-DC converter with resonant reset. In this present invention, the active resonant snubber in parallel to a primary winding of a transformer of a DC-DC converter for resetting the transformer includes a resonant capacitor, an active switch connected to the resonant capacitor in series, an auxiliary diode coupled across the active switch in parallel, and an auxiliary winding coupled with the transformer. When a main switch of the DC-DC converter is turned off, the auxiliary winding turns on the active switch, and then the transformer is reset by a resonance between a magnetizing inductor of the transformer and the resonant capacitor.

摘要翻译： 本发明提出了具有谐振复位的DC-DC转换器的改进的电路设计和配置。 在本发明中，与用于复位变压器的DC-DC转换器的变压器的初级绕组并联的有源谐振缓冲器包括谐振电容器，串联连接到谐振电容器的有源开关，辅助二极管 有源开关并联，以及与变压器耦合的辅助绕组。 当DC-DC转换器的主开关关闭时，辅助绕组接通有源开关，然后变压器由变压器的励磁电感器和谐振电容器之间的谐振复位。

公开(公告)号：US06853568B2

公开(公告)日：2005-02-08

申请号：US10441620

申请日：2003-05-20

申请人： Wenhua Li ,  Zhongwei Ke ,  Guisong Huang ,  Alpha J. Zhang

发明人： Wenhua Li ,  Zhongwei Ke ,  Guisong Huang ,  Alpha J. Zhang

IPC分类号： H02M3/335

CPC分类号： H02M3/33592 ,  Y02B70/1475

摘要： The present invention proposes a new structure for a high input VRM. This structure is similar to a simple buck converter and can simplify the 48V input VRM design. In this present invention, the interleaved voltage regulator is provided. The interleaved voltage regulator includes an integrated magnetic device for performing both transformer and output choke filter function, a first switch, a second switch, a third switch, and a fourth switch, wherein the integrated magnetic device includes a transformer having a first primary winding, a second primary winding, a first secondary winding, and a second secondary winding, a first choke filter having one end coupled to a first terminal of the first secondary winding, and a second choke filter having one end coupled to a first terminal of the second secondary winding, and the other end of the second choke filter coupled to the other end of the first choke filter to form the output terminal of the isolated voltage regulator. The first switch, the second switch, the first choke filter, and the first secondary winding form a synchronous rectifier circuit. The third switch, the fourth switch, the second choke filter, and the second secondary winding form another synchronous rectifier circuit.

摘要翻译： 本发明提出了一种高输入VRM的新结构。 这种结构类似于简单的降压转换器，可以简化48V输入VRM设计。 在本发明中，提供了交错式电压调节器。 交错式电压调节器包括用于执行变压器和输出扼流圈滤波器功能的集成磁性装置，第一开关，第二开关，第三开关和第四开关，其中所述集成磁性装置包括具有第一初级绕组的变压器， 第二初级绕组，第一次级绕组和第二次级绕组，第一扼流器滤波器，其一端耦合到第一次级绕组的第一端子，以及第二扼流器滤波器，其一端耦合到第二次级绕组的第一端子 次级绕组，并且第二扼流圈滤波器的另一端耦合到第一扼流圈滤波器的另一端，以形成隔离稳压器的输出端。 第一开关，第二开关，第一扼流圈滤波器和第一次级绕组形成同步整流电路。 第三开关，第四开关，第二扼流圈滤波器和第二次级绕组形成另一同步整流电路。

公开(公告)号：US06639814B2

公开(公告)日：2003-10-28

申请号：US10011541

申请日：2001-12-03

申请人： Hongjian Gan ,  Zhongwei Ke ,  Chaoqun Sun ,  Alpha J. Zhang

发明人： Hongjian Gan ,  Zhongwei Ke ,  Chaoqun Sun ,  Alpha J. Zhang

IPC分类号： H02M3335

CPC分类号： H02M3/33538

摘要： A constant voltage reset circuit used in a forward converter for the holdup time requirement or the wide input voltage range is disclosed. In one embodiment, the constant voltage reset circuit comprises a reset capacitor, a parallel-coupled switch, and a diode coupled in series with the reset capacitor which is configured to cooperate therewith to reset an energy from the transformer. The forward converter employing the reset circuit or the method achieves a higher efficiency with a larger turn ratio and without the 50% limitation of maximum duty cycle.

摘要翻译： 公开了一种用于正向转换器中用于保持时间要求或宽输入电压范围的恒压复位电路。 在一个实施例中，恒压复位电路包括复位电容器，并联耦合开关和与复位电容器串联耦合的二极管，其被配置为与其配合以复位来自变压器的能量。 使用复位电路的正激转换器或该方法以更大的匝数比实现更高的效率，而没有最大占空比的50％的限制。

公开(公告)号：US06538906B1

公开(公告)日：2003-03-25

申请号：US10074074

申请日：2002-02-11

申请人： Zhongwei Ke ,  Alpha J. Zhang ,  Bin Jin

发明人： Zhongwei Ke ,  Alpha J. Zhang ,  Bin Jin

IPC分类号： H02M3335

CPC分类号： H02M3/33569 ,  H02J9/061

摘要： An energy storage circuit for a wide input voltage range DC-DC converter with holdup time requirement. The energy storage circuit comprises (1) an energy storage capacitor, (2) a charging path including a diode connected in series with a current limiting resistor coupled in series with the energy storage capacitor, (3) a discharging path including a parallel-coupled switch and a diode coupled in series with a filtering inductor which is coupled in series with the energy storage capacitor, and (4) a logic control unit coupled to the switch for turning the switch of the discharge path on and off.

摘要翻译： 一种用于宽输入电压范围DC-DC转换器的储能电路，具有保持时间要求。 能量存储电路包括（1）储能电容器，（2）充电路径，其包括与与所述储能电容器串联耦合的限流电阻器串联的二极管，（3）放电路径，包括并联耦合 开关和与与能量存储电容器串联耦合的滤波电感器串联耦合的二极管，以及（4）耦合到开关的逻辑控制单元，用于打开和关闭放电路径的开关。