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：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：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：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：US06987679B2

公开(公告)日：2006-01-17

申请号：US10465138

申请日：2003-06-18

申请人： Hongjian Gan ,  Sen Dou ,  Alpha J. Zhang ,  Alex Jong ,  Chanwit Prasantanakorn

发明人： Hongjian Gan ,  Sen Dou ,  Alpha J. Zhang ,  Alex Jong ,  Chanwit Prasantanakorn

IPC分类号： H02M7/217

CPC分类号： H02M3/33592 ,  H02M2001/009 ,  Y02B70/1475

摘要： A cost effective circuit improves the cross regulation of multiple outputs converter, especially for that output chokes are coupled and a synchronous rectifier is applied to one of the outputs. A DC/DC converter includes a transformer having a primary winding and two secondary windings. The first secondary winding is coupled to a synchronous rectifier and a first output choke. The second secondary winding is coupled to a diode rectifier and a second output choke. The first output choke and the second output choke are coupled. A low power MOSFET switch is added to the diode rectifier for avoiding the diode rectifier operating in DCM when light loaded.

摘要翻译： 成本有效的电路改善了多输出转换器的交叉调节，特别是对于输出扼流圈耦合，并且将同步整流器应用于其中一个输出。 DC / DC转换器包括具有初级绕组和两个次级绕组的变压器。 第一次级绕组耦合到同步整流器和第一输出扼流圈。 第二次级绕组耦合到二极管整流器和第二输出扼流圈。 第一输出扼流圈和第二输出扼流圈耦合。 低功率MOSFET开关被添加到二极管整流器，以避免二极管整流器在轻载时在DCM中工作。

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：US07106130B2

公开(公告)日：2006-09-12

申请号：US10656420

申请日：2003-09-05

申请人： Hongjian Gan ,  Bo Wang ,  Alpha J. Zhang

发明人： Hongjian Gan ,  Bo Wang ,  Alpha J. Zhang

IPC分类号： H03F3/38

CPC分类号： H02M3/156 ,  H02M2001/0032 ,  H03K3/0231 ,  Y02B70/16

摘要： The present invention discloses a circuit that generates a variable frequency pulse width modulation (VF PWM) signal. Different from the conventional PWM controller, the frequency and duty cycle of the output PWM signal vary with the error-amplified voltage of the feedback loop simultaneously in this invention. The higher the error-amplified voltage of the feedback loop is, the lower the duty cycle with lower frequency will be. A very low duty cycle PWM signal can be generated stably while its frequency is very low.

摘要翻译： 本发明公开了一种产生可变频率脉宽调制（VF PWM）信号的电路。 与传统PWM控制器不同，在本发明中，输出PWM信号的频率和占空比同时反馈回路的误差放大电压变化。 反馈环路的误差放大电压越高，频率越低的占空比越低。 在其频率非常低的情况下，可以稳定地产生非常低的占空比PWM信号。