公开(公告)号：US08891259B2

公开(公告)日：2014-11-18

申请号：US13198981

申请日：2011-08-05

申请人： PingAn Zhao ,  Huizhen Zhu ,  Hu Wang ,  Chao Gao

发明人： PingAn Zhao ,  Huizhen Zhu ,  Hu Wang ,  Chao Gao

IPC分类号： H02M3/335 ,  H02M1/00 ,  H02M1/44

CPC分类号： H02M3/33507 ,  H02M1/44 ,  H02M2001/0032 ,  Y02B70/16

摘要： A control circuit is configured for controlling a power switch to regulate an output of a power converter. The control circuit is configured to increase a switching frequency of the power switch when a first signal representing a magnitude of the power converter is below a first output level. In some embodiment, the first output level is selected such that when the first signal is below the first output level, the power converter may generate audible noise. In an embodiment, when the first signal is above the first output level, the control circuit is configured to turn off the power switch when a second signal representing a current in the power switch is above a first reference level. On the other hand, when the first signal is below the first output level, the control circuit is configured to turn off the power switch if the second signal reaches a lower reference level.

摘要翻译： 控制电路被配置为用于控制功率开关以调节功率转换器的输出。 控制电路被配置为当表示功率转换器的幅度的第一信号低于第一输出电平时，增加电源开关的开关频率。 在一些实施例中，选择第一输出电平，使得当第一信号低于第一输出电平时，功率转换器可产生可听见的噪声。 在一个实施例中，当第一信号高于第一输出电平时，控制电路被配置为当表示电源开关中的电流的第二信号高于第一参考电平时，关闭电源开关。 另一方面，当第一信号低于第一输出电平时，如果第二信号达到较低的参考电平，则控制电路被配置为关闭电源开关。

公开(公告)号：US20120293146A1

公开(公告)日：2012-11-22

申请号：US13198981

申请日：2011-08-05

申请人： PingAn Zhao ,  Huizhen Zhu ,  Hu Wang ,  Chao Gao

发明人： PingAn Zhao ,  Huizhen Zhu ,  Hu Wang ,  Chao Gao

IPC分类号： G05F1/10

CPC分类号： H02M3/33507 ,  H02M1/44 ,  H02M2001/0032 ,  Y02B70/16

摘要： A control circuit is configured for controlling a power switch to regulate an output of a power converter. The control circuit is configured to increase a switching frequency of the power switch when a first signal representing a magnitude of the power converter is below a first output level. In some embodiment, the first output level is selected such that when the first signal is below the first output level, the power converter may generate audible noise. In an embodiment, when the first signal is above the first output level, the control circuit is configured to turn off the power switch when a second signal representing a current in the power switch is above a first reference level. On the other hand, when the first signal is below the first output level, the control circuit is configured to turn off the power switch if the second signal reaches a lower reference level.

摘要翻译： 控制电路被配置为用于控制功率开关以调节功率转换器的输出。 控制电路被配置为当表示功率转换器的幅度的第一信号低于第一输出电平时，增加电源开关的开关频率。 在一些实施例中，选择第一输出电平，使得当第一信号低于第一输出电平时，功率转换器可产生可听见的噪声。 在一个实施例中，当第一信号高于第一输出电平时，控制电路被配置为当表示电源开关中的电流的第二信号高于第一参考电平时，关闭电源开关。 另一方面，当第一信号低于第一输出电平时，如果第二信号达到较低的参考电平，则控制电路被配置为关闭电源开关。

公开(公告)号：US09318962B2

公开(公告)日：2016-04-19

申请号：US13708922

申请日：2012-12-07

申请人： Chao Gao ,  Pingan Zhao ,  Chao Chen

发明人： Chao Gao ,  Pingan Zhao ,  Chao Chen

IPC分类号： G05F3/16 ,  H02M3/335

CPC分类号： H02M3/33523 ,  H02M3/33507

摘要： A switching mode power supply (SMPS) includes a transformer having a primary winding for coupling to an input power source, a secondary winding for providing an output voltage of the SMPS, and an auxiliary winding. The SMPS also has a power transistor coupled to the primary winding and a primary side control circuit coupled to the auxiliary winding and the power transistor. The primary side control circuit is configured to regulate the output of the SMPS by controlling the power switch in response to a feedback voltage signal that is representative of an output of the SMPS. The SMPs also has a secondary-side control circuit coupled to the secondary winding and being configured to cause the output voltage of the SMPS to discharge when the output voltage of the SMPS is higher than a first reference voltage.

摘要翻译： 开关电源（SMPS）包括具有用于耦合到输入电源的初级绕组的变压器，用于提供SMPS的输出电压的次级绕组和辅助绕组。 SMPS还具有耦合到初级绕组的功率晶体管和耦合到辅助绕组和功率晶体管的初级侧控制电路。 初级侧控制电路被配置为通过响应于代表SMPS的输出的反馈电压信号来控制功率开关来调节SMPS的输出。 SMP还具有耦合到次级绕组的次级侧控制电路，并且被配置为当SMPS的输出电压高于第一参考电压时使SMPS的输出电压放电。

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：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：US20140016375A1

公开(公告)日：2014-01-16

申请号：US13708922

申请日：2012-12-07

申请人： CHAO GAO ,  PINGAN ZHAO ,  CHAO CHEN

发明人： CHAO GAO ,  PINGAN ZHAO ,  CHAO CHEN

IPC分类号： H02M3/335

CPC分类号： H02M3/33523 ,  H02M3/33507

摘要： A switching mode power supply (SMPS) includes a transformer having a primary winding for coupling to an input power source, a secondary winding for providing an output voltage of the SMPS, and an auxiliary winding. The SMPS also has a power transistor coupled to the primary winding and a primary side control circuit coupled to the auxiliary winding and the power transistor. The primary side control circuit is configured to regulate the output of the SMPS by controlling the power switch in response to a feedback voltage signal that is representative of an output of the SMPS. The SMPs also has a secondary-side control circuit coupled to the secondary winding and being configured to cause the output voltage of the SMPS to discharge when the output voltage of the SMPS is higher than a first reference voltage.

摘要翻译： 开关电源（SMPS）包括具有用于耦合到输入电源的初级绕组的变压器，用于提供SMPS的输出电压的次级绕组和辅助绕组。 SMPS还具有耦合到初级绕组的功率晶体管和耦合到辅助绕组和功率晶体管的初级侧控制电路。 初级侧控制电路被配置为通过响应于代表SMPS的输出的反馈电压信号来控制功率开关来调节SMPS的输出。 SMP还具有耦合到次级绕组的次级侧控制电路，并且被配置为当SMPS的输出电压高于第一参考电压时使SMPS的输出电压放电。