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：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。

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：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：US07518263B2

公开(公告)日：2009-04-14

申请号：US10823489

申请日：2004-04-12

申请人： Hongjian Gan ,  Huijie Xue ,  Chaoqun Sun ,  Alpha J. Zhang

发明人： Hongjian Gan ,  Huijie Xue ,  Chaoqun Sun ,  Alpha J. Zhang

IPC分类号： H02J3/14 ,  H02J3/12

CPC分类号： H02M3/33561 ,  H02M2001/007 ,  H02M2001/008 ,  Y02B70/1433 ,  Y10T307/406 ,  Y10T307/414

摘要： A time delay synchronous control scheme for a power supply, which has multiple outputs and tight output regulations, is provided. The switching mode power supply includes (1) a front-end DC/DC converter with current mode output, which can be a LLC Series Resonant converter (SRC) or a flyback converter; (2) one or several post buck converters directly cascaded from the output capacitor of the front-end DC/DC converter; (3) a new scheme of time delay synchronous control used to make the post buck synchronize and modulate from the front-end LLC-SRC or flyback converter. The proposed time delay synchronous control circuit can eliminate the conventional input filter of the post buck converters, as well as reduce the ripple current on the output capacitor of the front-end DC/DC converter, as a result of which, a high efficiency for the overall architecture can be obtained.

摘要翻译： 提供了具有多个输出和严格的输出规定的电源的延时同步控制方案。 开关电源包括（1）具有电流模式输出的前端DC / DC转换器，可以是LLC系列谐振转换器（SRC）或反激式转换器; （2）从前端DC / DC转换器的输出电容器直接级联的一个或多个后降压转换器; （3）用于使前置放大器同步并从前端LLC-SRC或反激转换器调制的时间延迟同步控制的新方案。 所提出的延时同步控制电路可以消除后降压转换器的常规输入滤波器，并减少前端DC / DC转换器的输出电容上的纹波电流，结果是高效率 可以获得整体架构。

公开(公告)号：US06469915B2

公开(公告)日：2002-10-22

申请号：US09845686

申请日：2001-04-30

申请人： Guisong Huang ,  Yilei Gu ,  Zhizheng Liu ,  Alpha J. Zhang

发明人： Guisong Huang ,  Yilei Gu ,  Zhizheng Liu ,  Alpha J. Zhang

IPC分类号： H02M3335

CPC分类号： H02M3/33569 ,  Y02B70/1433

摘要： A resonant reset dual switch forward converter is disclosed. The resonant reset dual switch forward converter includes an input for accepting a DC voltage; a transformer having a primary winding and a secondary winding; a first and a second switch connected in series with the primary winding of the transformer for periodically connecting the input to the primary winding; a resonant capacitor for resetting the transformer during the OFF time of the first and second switches; and an auxiliary switch remaining OFF during the ON time of the first and second switches, and connecting the primary winding to the resonant capacitor during the OFF time of the first and second switches. The resonant reset dual switch forward converter provides a switching duty cycle greater than 50%, obtains a zero-voltage-switching condition for the first and second switches, and maintains the voltage stress of the f first and second switches around the input voltage.

摘要翻译： 公开了一种谐振复位双开关正激变换器。 谐振复位双开关正激转换器包括用于接受直流电压的输入; 具有初级绕组和次级绕组的变压器; 与变压器的初级绕组串联连接的第一和第二开关，用于周期性地将输入连接到初级绕组; 用于在所述第一和第二开关的断开时间期间复位所述变压器的谐振电容器; 并且辅助开关在第一和第二开关的接通时间期间保持OFF，并且在第一和第二开关的OFF时间期间将初级绕组连接到谐振电容器。 谐振复位双开关正激转换器提供大于50％的开关占空比，获得第一和第二开关的零电压切换条件，并保持第一和第二开关周围的输入电压的电压应力。

公开(公告)号：US06724631B2

公开(公告)日：2004-04-20

申请号：US10127896

申请日：2002-04-22

申请人： Runqing Ye ,  Alpha J. Zhang

发明人： Runqing Ye ,  Alpha J. Zhang

IPC分类号： H05K720

CPC分类号： H05K7/20418 ,  H01L23/36 ,  H01L23/42 ,  H01L24/48 ,  H01L2224/48247 ,  H01L2924/00014 ,  H01L2924/15311 ,  H01L2924/1532 ,  H01L2924/181 ,  H01L2924/3011 ,  H05K1/0203 ,  H05K1/141 ,  H05K3/0061 ,  H05K3/3421 ,  H05K7/209 ,  H05K2201/10477 ,  Y10T29/4935 ,  H01L2924/00012 ,  H01L2224/45099 ,  H01L2224/45015 ,  H01L2924/207

摘要： A package for power converters in which all parts are electrically connected with one multi-layer circuit board. A sub-package with at least a power-dissipating chip, having a bare top up-facing heat-slug is electrically connected with the board by a plurality of symmetric leads. A heat spreader is directly attached onto the bare top heat-slug of the sub-packages, planar magnetic parts and top surfaces of other components with thermally conductive insulator. The heat dissipated by the sub-packages is transferred to the attached heat spreader by the bare top heat-slug, and further transferred to the ambient. The assembly features compact and inexpensive power converter package with improved electrical performance and enhanced thermal management.

摘要翻译： 用于电源转换器的封装，其中所有部件与一个多层电路板电连接。 具有至少具有功率耗散芯片的子封装，具有裸露的顶部向上的热插块，通过多个对称引线与板电连接。 散热器直接连接到具有导热绝缘体的其他部件的子封装，平面磁性部件和顶表面的裸顶部热塞上。 由子封装消散的热量通过裸顶部散热片传递到附着的散热器，并进一步转移到环境中。 该组件具有紧凑且廉价的功率转换器封装，具有改进的电气性能和增强的热管理。

公开(公告)号：US06424543B1

公开(公告)日：2002-07-23

申请号：US09811757

申请日：2001-03-19

申请人： Alpha J. Zhang ,  Guisong Huang ,  Yilei Gu

发明人： Alpha J. Zhang ,  Guisong Huang ,  Yilei Gu

IPC分类号： H02M3335

CPC分类号： H02M1/10 ,  H02M3/33569

摘要： An integral DC to DC converter includes an input capacitor, a DC to AC circuit, a transformer, a rectifying circuit, a filtering capacitor and a control signal generator. The DC to AC circuit is connected with the input capacitor for converting the input DC voltage to a high frequency first AC voltage and the DC to AC circuit includes four full-bridge switching devices. The transformer is used for converting the first AC voltage into a second AC voltage. The rectifying circuit is connected to the secondary winding of the transformer for rectifying the second AC voltage to the output DC voltage. The filtering capacitor is connected to the rectifying circuit for filtering the output DC voltage. The control signal generator is used for providing a control signal to control the full-bridge switching device.