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：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：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。

公开(公告)号：US06807071B1

公开(公告)日：2004-10-19

申请号：US10629091

申请日：2003-07-28

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

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

IPC分类号： H02M3335

CPC分类号： H03K17/691 ,  H02M1/08 ,  H02M1/32 ,  H03K17/04123

摘要： A transformer isolated gate driver for realizing the driving of a power switch (a MOSFET) includes a PWM driver, an input capacitor, a transformer, an output diode, a active switch (a small power MOSFET) having a gate and a source connected to the first and second terminals of the secondary winding of the transformer respectively, an output capacitor connected to one of the first terminal of the transformer and a drain of the active switch in series, and a series connected circuit having the first and second terminals of the transformer, the output capacitor, the output diode, and the active switch. The charges across an equivalent input capacitor of the power switch are discharged through the series connected circuit. When the PWM signal is pulled to zero from normal operation, the driving signal on the power switch is kept zero also.

摘要翻译： 用于实现功率开关（MOSFET）的驱动的变压器隔离栅极驱动器包括PWM驱动器，输入电容器，变压器，输出二极管，具有栅极和源极的有源开关（小功率MOSFET） 变压器的次级绕组的第一和第二端子分别连接到变压器的第一端子和串联的有源开关的漏极之间的输出电容器，以及串联的电路，其具有第一和第二端子 变压器，输出电容，输出二极管和有源开关。 电源开关的等效输入电容器上的电荷通过串联电路放电。 当PWM信号从正常操作拉到零时，电源开关上的驱动信号也保持为零。

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：US07034513B2

公开(公告)日：2006-04-25

申请号：US10654307

申请日：2003-09-03

申请人： Hongjian Gan ,  Qinggang Kong ,  Alpha J. Zhang ,  Jian Jung Chang

发明人： Hongjian Gan ,  Qinggang Kong ,  Alpha J. Zhang ,  Jian Jung Chang

IPC分类号： G05F1/40

CPC分类号： H02M3/28 ,  G05F1/66 ,  H02M2001/0019 ,  H02M2001/0032 ,  Y02B70/16

摘要： A power supply has a normal operation mode and a standby operation mode. The power supply includes a main circuit, a first control circuit, a second control circuit, and a switching controller. The main circuit has at least one output port for converting an input voltage into an output voltage at the output port. The first control circuit is used for controlling the main circuit under the normal operation mode. The second control circuit is used for controlling the main circuit under the standby operation mode. And, the switching controller processes a control signal to control the first control circuit and the second control circuit under either of the normal operation mode and the standby operation mode in response to a load status of the output port.

摘要翻译： 电源具有正常操作模式和待机操作模式。 电源包括主电路，第一控制电路，第二控制电路和开关控制器。 主电路具有至少一个用于将输入电压转换为输出端口的输出电压的输出端口。 第一控制电路用于在正常操作模式下控制主电路。 第二控制电路用于在待机操作模式下控制主电路。 并且，响应于输出端口的负载状态，开关控制器处理控制信号以在正常操作模式和待机操作模式中的任一者下控制第一控制电路和第二控制电路。

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：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.