公开(公告)号：US09083246B2

公开(公告)日：2015-07-14

申请号：US13090680

申请日：2011-04-20

申请人： Qiang Zong ,  Huizhen Zhu ,  Pingan Zhao ,  Yajiang Zhu

发明人： Qiang Zong ,  Huizhen Zhu ,  Pingan Zhao ,  Yajiang Zhu

IPC分类号： H02M3/335

CPC分类号： H02M3/33507

摘要： A switched mode power supply (SMPS) includes a transformer with a primary winding, a secondary winding, an auxiliary winding, and a power switch coupled to the primary winding. During one switching cycle, the auxiliary winding provides a feedback signal which includes a first voltage pulse that is induced after the power switch is turned on and a second voltage pulse that is induced after the power switch is turned off. A control circuit includes a circuit for generating a sampling signal for sampling the second voltage pulse in a switching cycle at a time that is determined based on the first voltage pulse in the same switching cycle. A sample-and-hold circuit is configured for sampling and storing the second voltage pulse in response to the sampling signal. A switching signal generating circuit is configured to generate a switching signal for controlling the power switch based on an output of the sample-and-hold circuit.

摘要翻译： 开关模式电源（SMPS）包括具有初级绕组的变压器，次级绕组，辅助绕组和耦合到初级绕组的功率开关。 在一个开关周期期间，辅助绕组提供反馈信号，该反馈信号包括在电源开关导通之后感应的第一电压脉冲和在电源开关断开之后引起的第二电压脉冲。 控制电路包括用于产生采样信号的电路，所述采样信号用于在基于相同切换周期中的第一电压脉冲确定的时间的开关周期中对第二电压脉冲进行采样。 采样保持电路被配置为响应于采样信号对第二电压脉冲进行采样和存储。 开关信号发生电路被配置为基于采样保持电路的输出产生用于控制功率开关的开关信号。

公开(公告)号：US20110261596A1

公开(公告)日：2011-10-27

申请号：US13090680

申请日：2011-04-20

申请人： Qiang Zong ,  Huizhen Zhu ,  Pingan Zhao ,  Yajiang Zhu

发明人： Qiang Zong ,  Huizhen Zhu ,  Pingan Zhao ,  Yajiang Zhu

IPC分类号： H02M3/335

CPC分类号： H02M3/33507

摘要： A switched mode power supply (SMPS) includes a transformer with a primary winding, a secondary winding, an auxiliary winding, and a power switch coupled to the primary winding. During one switching cycle, the auxiliary winding provides a feedback signal which includes a first voltage pulse that is induced after the power switch is turned on and a second voltage pulse that is induced after the power switch is turned off. A control circuit includes a circuit for generating a sampling signal for sampling the second voltage pulse in a switching cycle at a time that is determined based on the first voltage pulse in the same switching cycle. A sample-and-hold circuit is configured for sampling and storing the second voltage pulse in response to the sampling signal. A switching signal generating circuit is configured to generate a switching signal for controlling the power switch based on an output of the sample-and-hold circuit.

摘要翻译： 开关模式电源（SMPS）包括具有初级绕组的变压器，次级绕组，辅助绕组和耦合到初级绕组的功率开关。 在一个开关周期期间，辅助绕组提供反馈信号，该反馈信号包括在电源开关导通之后感应的第一电压脉冲和在电源开关断开之后引起的第二电压脉冲。 控制电路包括用于产生采样信号的电路，所述采样信号用于在基于相同切换周期中的第一电压脉冲确定的时间的开关周期中对第二电压脉冲进行采样。 采样保持电路被配置为响应于采样信号对第二电压脉冲进行采样和存储。 开关信号发生电路被配置为基于采样保持电路的输出产生用于控制功率开关的开关信号。

公开(公告)号：US20110096578A1

公开(公告)日：2011-04-28

申请号：US12604246

申请日：2009-10-22

申请人： ShaoHua Fang ,  BaoZhen Chen ,  Qiang Zong ,  YaJiang Zhu

发明人： ShaoHua Fang ,  BaoZhen Chen ,  Qiang Zong ,  YaJiang Zhu

IPC分类号： H02M7/217

CPC分类号： H02M3/33592 ,  H02M3/33561 ,  H02M3/33576 ,  H02M7/217 ,  H03K5/08 ,  H03K17/133 ,  H03K17/302 ,  H03K2017/307 ,  Y02B70/1475

摘要： A synchronous rectification circuit for a power converter includes a power switch coupled to a transformer and an output capacitor and a switching control circuit configured to provide a control signal to the power switch in response to a first state and a second state of the voltage across the power switch. In the switching control circuit, the second state is determined prior to the first state is determined. In an embodiment, the switching control circuit includes a voltage comparing unit configured to act in response to the first and second inputs. The voltage comparing unit is also configured to output a logic signal according to the voltage difference between the sensed voltage drop across the power switch and a reference threshold voltage. A logic processing circuit is coupled to the voltage comparing unit and configured to provide the first state and the second state of the voltage across the power switch.

摘要翻译： 用于功率转换器的同步整流电路包括耦合到变压器的电源开关和输出电容器，以及开关控制电路，其被配置为响应于第一状态和第二状态的电压来向功率开关提供控制信号 开关;电源开关。 在开关控制电路中，在确定第一状态之前确定第二状态。 在一个实施例中，开关控制电路包括被配置为响应于第一和第二输入而动作的电压比较单元。 电压比较单元还被配置为根据感测到的电源开关上的电压降与参考阈值电压之间的电压差输出逻辑信号。 逻辑处理电路耦合到电压比较单元并且被配置为在电源开关上提供电压的第一状态和第二状态。

公开(公告)号：US08526202B2

公开(公告)日：2013-09-03

申请号：US12604246

申请日：2009-10-22

申请人： ShaoHua Fang ,  BaoZhen Chen ,  Qiang Zong ,  YaJiang Zhu

发明人： ShaoHua Fang ,  BaoZhen Chen ,  Qiang Zong ,  YaJiang Zhu

IPC分类号： H02M7/217

CPC分类号： H02M3/33592 ,  H02M3/33561 ,  H02M3/33576 ,  H02M7/217 ,  H03K5/08 ,  H03K17/133 ,  H03K17/302 ,  H03K2017/307 ,  Y02B70/1475

摘要： A synchronous rectification circuit for a power converter includes a power switch coupled to a transformer and an output capacitor and a switching control circuit configured to provide a control signal to the power switch in response to a first state and a second state of the voltage across the power switch. In the switching control circuit, the second state is determined prior to the first state is determined. In an embodiment, the switching control circuit includes a voltage comparing unit configured to act in response to the first and second inputs. The voltage comparing unit is also configured to output a logic signal according to the voltage difference between the sensed voltage drop across the power switch and a reference threshold voltage. A logic processing circuit is coupled to the voltage comparing unit and configured to provide the first state and the second state of the voltage across the power switch.

摘要翻译： 用于功率转换器的同步整流电路包括耦合到变压器的电源开关和输出电容器，以及开关控制电路，其被配置为响应于第一状态和第二状态的电压来向功率开关提供控制信号 开关;电源开关。 在开关控制电路中，在确定第一状态之前确定第二状态。 在一个实施例中，开关控制电路包括被配置为响应于第一和第二输入而动作的电压比较单元。 电压比较单元还被配置为根据感测到的电源开关上的电压降与参考阈值电压之间的电压差输出逻辑信号。 逻辑处理电路耦合到电压比较单元并且被配置为在电源开关上提供电压的第一状态和第二状态。

公开(公告)号：US08482943B2

公开(公告)日：2013-07-09

申请号：US12638809

申请日：2009-12-15

申请人： Jianhua Duan ,  Qiang Zong ,  Yajiang Zhu

发明人： Jianhua Duan ,  Qiang Zong ,  Yajiang Zhu

IPC分类号： H02M1/12 ,  H02M3/335

CPC分类号： H03K17/16 ,  G05F3/26 ,  G05F3/267 ,  G05F3/30 ,  H02M3/33507 ,  H03K17/04123 ,  H03K2217/0036

摘要： A power supply controller is provided for providing a drive current to a control terminal of a power transistor in three time intervals. The controller includes control circuits configured to control the drive current in multiple stages. During a first time interval, first drive current includes a current spike for turning on the power transistor in response to a start of the control signal pulse. During a second time interval, a second drive current includes a ramping current substantially proportional to a magnitude of a current through the power transistor. During a third time interval, current flow to the power transistor is at least partially turned off before an end of the control signal pulse.

摘要翻译： 提供电源控制器，用于以三个时间间隔向功率晶体管的控制端提供驱动电流。 该控制器包括配置成控制多级驱动电流的控制电路。 在第一时间间隔期间，第一驱动电流包括用于响应于控制信号脉冲的启动来接通功率晶体管的电流尖峰。 在第二时间间隔期间，第二驱动电流包括基本上与通过功率晶体管的电流的大小成比例的斜坡电流。 在第三时间间隔期间，在控制信号脉冲结束之前，至功率晶体管的电流至少部分截止。

公开(公告)号：US20110122659A1

公开(公告)日：2011-05-26

申请号：US12638809

申请日：2009-12-15

申请人： Jianhua Duan ,  Qiang Zong ,  YaJiang Zhu

发明人： Jianhua Duan ,  Qiang Zong ,  YaJiang Zhu

IPC分类号： H02M3/335 ,  G05F1/10

CPC分类号： H03K17/16 ,  G05F3/26 ,  G05F3/267 ,  G05F3/30 ,  H02M3/33507 ,  H03K17/04123 ,  H03K2217/0036

摘要： A power supply controller is provided for providing a drive current to a control terminal of a power transistor in three time intervals. The controller includes control circuits configured to control the drive current in multiple stages. During a first time interval, first drive current includes a current spike for turning on the power transistor in response to a start of the control signal pulse. During a second time interval, a second drive current includes a ramping current substantially proportional to a magnitude of a current through the power transistor. During a third time interval, current flow to the power transistor is at least partially turned off before an end of the control signal pulse.

摘要翻译： 提供电源控制器，用于以三个时间间隔向功率晶体管的控制端提供驱动电流。 该控制器包括配置成控制多级驱动电流的控制电路。 在第一时间间隔期间，第一驱动电流包括用于响应于控制信号脉冲的启动来接通功率晶体管的电流尖峰。 在第二时间间隔期间，第二驱动电流包括基本上与通过功率晶体管的电流的大小成比例的斜坡电流。 在第三时间间隔期间，在控制信号脉冲结束之前，至功率晶体管的电流至少部分截止。

公开(公告)号：US08559200B2

公开(公告)日：2013-10-15

申请号：US13015493

申请日：2011-01-27

申请人： Qiang Zong ,  Shaohua Fang ,  Reixia Fei ,  Jia Xie

发明人： Qiang Zong ,  Shaohua Fang ,  Reixia Fei ,  Jia Xie

IPC分类号： H02M1/00 ,  H02M3/335

CPC分类号： H02M1/36

摘要： A startup circuit for a switching-mode power supply (SMPS) includes a first voltage detector configured to trigger the switching-mode power supply from a first operation mode to a second operation mode when an input supply voltage exceeds a first threshold voltage, a current consumption in the first voltage detector in the first operation mode being determined by a reverse leakage current of a diode. A feedback circuit is coupled to the first voltage detector and being capable of maintaining a positive feedback loop. A second voltage detector is coupled to the first voltage detector and the feedback circuit, and is configured to trigger the switching-mode power supply to switch from the second operation mode to the first operation mode when the input supply voltage is below a second threshold voltage.

摘要翻译： 用于开关电源（SMPS）的启动电路包括：第一电压检测器，其被配置为当输入电源电压超过第一阈值电压时将开关模式电源从第一操作模式触发到第二操作模式;电流 在第一操作模式中第一电压检测器中的消耗由二极管的反向泄漏电流确定。 反馈电路耦合到第一电压检测器并且能够维持正反馈回路。 第二电压检测器耦合到第一电压检测器和反馈电路，并且被配置为当输入电源电压低于第二阈值电压时触发开关模式电源从第二操作模式切换到第一操作模式 。

公开(公告)号：US20100244804A1

公开(公告)日：2010-09-30

申请号：US12466313

申请日：2009-05-14

申请人： Qiang Zong ,  Shaohua Fang ,  Reixia Fei ,  Jia Xie

发明人： Qiang Zong ,  Shaohua Fang ,  Reixia Fei ,  Jia Xie

IPC分类号： G05F5/00

CPC分类号： H02M1/36

摘要： A startup circuit for a switching-mode power supply (SMPS) includes a first voltage detector configured to trigger the switching-mode power supply from a startup mode to a normal operation mode when an input supply voltage exceeds a first threshold voltage, a current consumption in the first voltage detector in the startup mode being determined by a reverse leakage current of a diode. A feedback circuit is coupled to the first voltage detector and being capable of maintaining a positive feedback loop with a current consumption of no more than a microampere. A second voltage detector is coupled to the first voltage detector and the feedback circuit, and is configured to trigger the switching-mode power supply to switch from the normal operation mode to the startup mode when the input supply voltage is below a second threshold voltage.

摘要翻译： 用于开关电源（SMPS）的启动电路包括：第一电压检测器，被配置为当输入电源电压超过第一阈值电压时，将开关模式电源从启动模式触发到正常工作模式;电流消耗 在启动模式下的第一电压检测器由二极管的反向泄漏电流确定。 反馈电路耦合到第一电压检测器并且能够维持具有不超过微安的电流消耗的正反馈回路。 第二电压检测器耦合到第一电压检测器和反馈电路，并且被配置为当输入电源电压低于第二阈值电压时，触发开关模式电源从正常操作模式切换到启动模式。

公开(公告)号：US20110116289A1

公开(公告)日：2011-05-19

申请号：US13015493

申请日：2011-01-27

申请人： Qiang Zong ,  Shaohua Fang ,  Reixia Fei ,  Jia Xie

发明人： Qiang Zong ,  Shaohua Fang ,  Reixia Fei ,  Jia Xie

IPC分类号： H02M1/36

CPC分类号： H02M1/36

摘要： A startup circuit for a switching-mode power supply (SMPS) includes a first voltage detector configured to trigger the switching-mode power supply from a first operation mode to a second operation mode when an input supply voltage exceeds a first threshold voltage, a current consumption in the first voltage detector in the first operation mode being determined by a reverse leakage current of a diode. A feedback circuit is coupled to the first voltage detector and being capable of maintaining a positive feedback loop. A second voltage detector is coupled to the first voltage detector and the feedback circuit, and is configured to trigger the switching-mode power supply to switch from the second operation mode to the first operation mode when the input supply voltage is below a second threshold voltage.

摘要翻译： 用于开关电源（SMPS）的启动电路包括：第一电压检测器，其被配置为当输入电源电压超过第一阈值电压时将开关模式电源从第一操作模式触发到第二操作模式;电流 在第一操作模式中第一电压检测器中的消耗由二极管的反向泄漏电流确定。 反馈电路耦合到第一电压检测器并且能够维持正反馈回路。 第二电压检测器耦合到第一电压检测器和反馈电路，并且被配置为当输入电源电压低于第二阈值电压时触发开关模式电源从第二操作模式切换到第一操作模式 。

公开(公告)号：US07894219B2

公开(公告)日：2011-02-22

申请号：US12466313

申请日：2009-05-14

申请人： Qiang Zong ,  Shaohua Fang ,  Reixia Fei ,  Jia Xie

发明人： Qiang Zong ,  Shaohua Fang ,  Reixia Fei ,  Jia Xie

IPC分类号： H02M1/00 ,  H02M3/335

CPC分类号： H02M1/36

摘要： A startup circuit for a switching-mode power supply (SMPS) includes a first voltage detector configured to trigger the switching-mode power supply from a startup mode to a normal operation mode when an input supply voltage exceeds a first threshold voltage, a current consumption in the first voltage detector in the startup mode being determined by a reverse leakage current of a diode. A feedback circuit is coupled to the first voltage detector and being capable of maintaining a positive feedback loop with a current consumption of no more than a microampere. A second voltage detector is coupled to the first voltage detector and the feedback circuit, and is configured to trigger the switching-mode power supply to switch from the normal operation mode to the startup mode when the input supply voltage is below a second threshold voltage.

摘要翻译： 用于开关电源（SMPS）的启动电路包括：第一电压检测器，被配置为当输入电源电压超过第一阈值电压时，将开关模式电源从启动模式触发到正常工作模式;电流消耗 在启动模式下的第一电压检测器由二极管的反向泄漏电流确定。 反馈电路耦合到第一电压检测器并且能够维持具有不超过微安的电流消耗的正反馈回路。 第二电压检测器耦合到第一电压检测器和反馈电路，并且被配置为当输入电源电压低于第二阈值电压时，触发开关模式电源从正常操作模式切换到启动模式。