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：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.

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：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：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：US06714428B2

公开(公告)日：2004-03-30

申请号：US10107733

申请日：2002-03-26

申请人： Guisong Huang ,  Yilei Gu ,  Yuequan Hu ,  Alpha J. Zhang ,  Jack Hsiao

发明人： Guisong Huang ,  Yilei Gu ,  Yuequan Hu ,  Alpha J. Zhang ,  Jack Hsiao

IPC分类号： H02M542

CPC分类号： H02M3/33592 ,  Y02B70/1475

摘要： An active clamped-mode DC-to-DC converter with synchronous rectifiers and a combined transformer-inductor device is provided. The power converter includes a combined transformer-inductor device having a primary winding, a secondary winding, and an auxiliary winding where the primary and the secondary windings perform a transformer function and the auxiliary winding performs an output filter function, a switching circuit for periodically providing a positive voltage to the primary winding and a negative voltage to reset the primary winding, and a synchronous rectification circuit connected for enabling conduction from the secondary winding to an output port in which the auxiliary winding is coupled between the output port and the synchronous rectification circuit for providing an inductance to filter an output signal.

摘要翻译： 提供具有同步整流器和组合变压器 - 电感器装置的有源钳位模式DC-DC转换器。 功率转换器包括具有初级绕组，次级绕组和辅助绕组的组合变压器 - 电感器装置，其中初级绕组和次级绕组执行变压器功能，并且辅助绕组执行输出滤波器功能，用于周期性地提供 对初级绕组施加正电压和负电压以复位初级绕组;以及同步整流电路，其连接用于使得能够从次级绕组传导到输出端口，其中辅助绕组耦合在输出端口和同步整流电路之间 用于提供电感以对输出信号进行滤波。

公开(公告)号：US06466458B2

公开(公告)日：2002-10-15

申请号：US09782573

申请日：2001-02-12

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： H02M3/3372 ,  H02M3/33569

摘要： An asymmetrical full bridge DC-to-DC converter comprises an asymmetrical full bridge circuit which includes main switches and auxiliary switches, a capacitor connected in series to the branch circuit of the auxiliary switches, and a transformer having a primary winding and a secondary winding. The primary winding of transformer is connected to the common point of each leg of the full bridge. A rectification circuit is connected at the secondary winding of the transformer to obtain dc voltage output. In operation, an asymmetrical control method is applied for these main switches and auxiliary switches. Main switches and auxiliary switches turn on and turn off compensatively. A linear control characteristic of output voltage to switching duty cycle and an optimal reset of the transformer core is achieved by this invention.

摘要翻译： 不对称全桥DC-DC转换器包括一个非对称全桥电路，它包括主开关和辅助开关，一个与辅助开关的分支电路串联连接的电容器，以及一个具有初级绕组和次级绕组的变压器。 变压器的初级绕组连接到全桥的每条腿的公共点。 整流电路连接在变压器的次级绕组，以获得直流电压输出。 在这些主开关和辅助开关中，采用非对称控制方式。 主开关和辅助开关补偿打开和关闭。 通过本发明实现了输出电压对开关占空比的线性控制特性和变压器磁芯的最佳复位。

公开(公告)号：US06396715B1

公开(公告)日：2002-05-28

申请号：US09811680

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 for converting at least one input DC voltage into at least one output DC voltage is provided. The integral DC to DC converter includes a first input capacitor and a second input capacitor for providing the at least one input DC voltage, a DC to AC circuit, a transformer, a rectifying circuit, a filtering capacitor, two input DC voltage switching elements and an output voltage switching element. The integral DC to DC converter is implemented by switching the switching elements.

摘要翻译： 提供一种用于将至少一个输入DC电压转换成至少一个输出DC电压的集成DC-DC转换器。 积分DC-DC转换器包括第一输入电容器和第二输入电容器，用于提供至少一个输入DC电压，DC至AC电路，变压器，整流电路，滤波电容器，两个输入DC电压开关元件和 输出电压开关元件。 通过切换开关元件来实现集成的DC-DC转换器。

公开(公告)号：US06344979B1

公开(公告)日：2002-02-05

申请号：US09780128

申请日：2001-02-09

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

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

IPC分类号： H02M3335

CPC分类号： H02M3/337 ,  H02M3/3382 ,  Y02B70/1433

摘要： The present invention discloses a DC-to-DC converter. The DC-to-DC converter includes a square wave generator for generating a sequence of output voltages having a waveform of square wave. The DC-to-DC converter further includes a resonant tank connected to the square wave generator comprising a series capacitor connected to a series inductor and a parallel inductor. The DC-to-DC converter further includes a transformer having a primary side connected in series with the series inductor and connected in parallel to the parallel inductor. The transformer further includes a secondary side for connecting to a rectifying circuit for providing a rectified DC voltage to an output load circuit. The series capacitor functioning with the series inductor to provide a first characteristic resonant frequency represented by ƒs, and the series capacitor functioning with the series inductor and the parallel inductor to provide a second characteristic resonant frequency represented by ƒm wherein ƒs>ƒm. The converter runs at variable frequency switching to perform output regulation. The converter features high conversion efficiency at high input operation by switching at frequency between the first and second characteristic resonant frequency. In a preferred embodiment, the parallel inductor is integrated to transformer as primary magnetizing inductor and in further the series inductor may also be integrated into transformer.

摘要翻译： 本发明公开了一种DC-DC转换器。 DC-DC转换器包括用于产生具有方波波形的输出电压序列的方波发生器。 DC-DC转换器还包括连接到方波发生器的谐振槽，其包括连接到串联电感器和并联电感器的串联电容器。 DC-DC转换器还包括具有与串联电感器串联连接并与并联电感并联连接的初级侧的变压器。 变压器还包括用于连接到整流电路的次级侧，用于向输出负载电路提供经整流的DC电压。 串联电容器与串联电感器起作用以提供由ƒs表示的第一特性谐振频率，以及串联电容器与串联电感器和并联电感器起作用，以提供由ƒm表示的第二特性谐振频率，其中ƒs>ƒm。 转换器以可变频率切换运行，以执行输出调节。 该转换器在高输入操作下通过在第一和第二特性谐振频率之间切换频率而具有高转换效率。 在优选实施例中，并联电感器作为主要磁化电感器集成到变压器中，并且还可将串联电感器集成到变压器中。

公开(公告)号：US06370044B1

公开(公告)日：2002-04-09

申请号：US09855006

申请日：2001-05-14

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： H02M3/33592 ,  Y02B70/1475

摘要： A self-driven synchronous rectifier circuit applied to a forward converter is provided. The circuit includes a transformer having a primary winding and a secondary winding for converting an input voltage into an output voltage, a first synchronous rectifier switch and a second synchronous rectifier switch connected to the secondary winding for rectifying the output voltage; and an auxiliary switch, wherein the gate terminal thereof is connected to the gate terminal of the first synchronous rectifier switch and the positive end of the secondary winding, the source terminal thereof is connected to the drain terminal of the first synchronous rectifier switch and the negative end of the secondary winding, and the drain terminal thereof is connected to the gate terminal of the second synchronous rectifier switch.

摘要翻译： 提供了一种应用于正激变换器的自驱动同步整流电路。 电路包括具有初级绕组和用于将输入电压转换为输出电压的次级绕组的变压器，连接到次级绕组的第一同步整流开关和第二同步整流器开关，用于整流输出电压; 以及辅助开关，其栅极端子连接到第一同步整流开关的栅极端子和次级绕组的正极，其源极端子连接到第一同步整流器开关的漏极端子，负极 次级绕组的端部，其漏极端子连接到第二同步整流器开关的栅极端子。