公开(公告)号：US09391530B2

公开(公告)日：2016-07-12

申请号：US13966248

申请日：2013-08-13

申请人： BCD SEMICONDUCTOR MANUFACTURING LIMITED

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

IPC分类号： H02M3/335 ,  H02M3/337 ,  H02M7/217 ,  H03K17/30 ,  H03K5/13 ,  H03K5/08 ,  H03K17/13

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 supply includes a power switch for coupling to a secondary winding of a transformer of the power supply and an output capacitor of the power supply. The power switch includes a four-terminal MOSFET having a source, a drain, a gate, and a body. A body diode is formed by a junction between the body and the drain or by a junction between the body and the source. The body diode is coupled in parallel to the source and drain of the power transistor. A control circuit is configured to provide a control signal for controlling an on/off state of the power switch in response to a voltage condition of two terminals of the power switch. When the body diode makes a transition from reverse bias to forward bias, the control circuit causes the MOSFET to turn on, and when the forward bias voltage drops below a reference voltage, the control circuit causes the MOSFET to turn off. When the body diode makes a transition from forward bias to reverse bias, the control circuit causes the MOSFET to turn off.

摘要翻译： 用于电源的同步整流电路包括用于耦合到电源的变压器的次级绕组的电源开关和电源的输出电容器。 电源开关包括具有源极，漏极，栅极和主体的四端子MOSFET。 体二极管由本体和漏极之间的接合部或者主体与源极之间的接合部形成。 体二极管与功率晶体管的源极和漏极并联耦合。 控制电路被配置为响应于电源开关的两个端子的电压状况来提供用于控制电源开关的接通/断开状态的控制信号。 当体二极管从反向偏压转换为正向偏置时，控制电路使MOSFET导通，当正向偏置电压降至参考电压以下时，控制电路使MOSFET关断。 当体二极管从正向偏压转换到反向偏置时，控制电路使MOSFET关断。

公开(公告)号：US20140233272A1

公开(公告)日：2014-08-21

申请号：US13966248

申请日：2013-08-13

申请人： BCD Semiconductor Manufacturing Limited

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

IPC分类号： H02M3/335

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 supply includes a power switch for coupling to a secondary winding of a transformer of the power supply and an output capacitor of the power supply. The power switch includes a four-terminal MOSFET having a source, a drain, a gate, and a body. A body diode is formed by a junction between the body and the drain or by a junction between the body and the source. The body diode is coupled in parallel to the source and drain of the power transistor. A control circuit is configured to provide a control signal for controlling an on/off state of the power switch in response to a voltage condition of two terminals of the power switch. When the body diode makes a transition from reverse bias to forward bias, the control circuit causes the MOSFET to turn on, and when the forward bias voltage drops below a reference voltage, the control circuit causes the MOSFET to turn off. When the body diode makes a transition from forward bias to reverse bias, the control circuit causes the MOSFET to turn off

摘要翻译： 用于电源的同步整流电路包括用于耦合到电源的变压器的次级绕组的电源开关和电源的输出电容器。 电源开关包括具有源极，漏极，栅极和主体的四端子MOSFET。 体二极管由本体和漏极之间的接合部或者主体与源极之间的接合部形成。 体二极管与功率晶体管的源极和漏极并联耦合。 控制电路被配置为响应于电源开关的两个端子的电压状况来提供用于控制电源开关的接通/断开状态的控制信号。 当体二极管从反向偏压转换为正向偏置时，控制电路使MOSFET导通，当正向偏置电压降至参考电压以下时，控制电路使MOSFET关断。 当体二极管从正向偏压转换到反向偏置时，控制电路使MOSFET关断

公开(公告)号：US20130222044A1

公开(公告)日：2013-08-29

申请号：US13862289

申请日：2013-04-12

申请人： BCD Semiconductor Manufacturing Limited

发明人： Jianhua Duan ,  Qiang Zong ,  YaJiang Zhu

IPC分类号： H03K17/16

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。