公开(公告)号：US20140239930A1

公开(公告)日：2014-08-28

申请号：US14033341

申请日：2013-09-20

申请人： Hu Wang ,  Yajiang Zhu ,  Ruixia Fei ,  Shuzhuang Lv

发明人： Hu Wang ,  Yajiang Zhu ,  Ruixia Fei ,  Shuzhuang Lv

IPC分类号： H02M3/10

CPC分类号： H02M3/156 ,  H02M1/08 ,  H02M3/10 ,  H02M7/2176 ,  H02M2001/0009 ,  H02M2001/0022

摘要： A control circuit is provided for a buck converter that includes at least an inductor coupled to an output of the buck converter. The control circuit includes a power switch configured for coupling to a line voltage and configured for charging the inductor, an input line voltage sampling circuit, and a constant-voltage (CV) and constant-current (CC) control module coupled to the power switch. During a charging period of the inductor, the CV and CC control module is configured to control the power switch to provide a constant output current by maintaining a constant peak inductor current, even when the input line voltage changes. During a discharging period of the inductor, the CV and CC control module is configured to monitor the sensed output voltage to control the power switch to provide a constant output voltage.

摘要翻译： 提供了一种用于降压转换器的控制电路，其包括耦合到降压转换器的输出的至少一个电感器。 控制电路包括被配置为耦合到线路电压并被配置为对电感器充电的电源开关，输入线电压采样电路和耦合到电源开关的恒压（CV）和恒流（CC）控制模块 。 在电感器的充电期间，CV和CC控制模块配置为通过保持恒定的峰值电感电流来控制电源开关以提供恒定的输出电流，即使输入线路电压发生变化。 在电感器的放电期间，CV和CC控制模块被配置为监视感测的输出电压，以控制电源开关以提供恒定的输出电压。

公开(公告)号：US20130343095A1

公开(公告)日：2013-12-26

申请号：US13610790

申请日：2012-09-11

申请人： YAJIANG ZHU ,  Na Liu ,  Siyuan Xu

发明人： YAJIANG ZHU ,  Na Liu ,  Siyuan Xu

IPC分类号： H02M3/335 ,  H02M3/22

CPC分类号： H02M1/4258 ,  Y02B70/126

摘要： A switching mode power supply (SMPS) includes a rectifying device configured for converting a periodically varying input AC (alternating current) voltage into a DC (direct current) voltage, and a transformer including a primary winding, a secondary winding, and an auxiliary winding. The primary winding is coupled to the rectifying device. An input capacitor is coupled to the rectifying device and the primary winding of the transformer. A first power switch is coupled to the input capacitor. A control circuit is coupled to the first power switch and is configured to control the first power switch based on a phase or amplitude of the input AC voltage. By controlling the charging and discharging of the input capacitor, power is provided to the primary winding during a longer portion of the AC input voltage cycle, allowing the rectifier device to have a larger conduction angle to increase a power factor (PF).

摘要翻译： 开关模式电源（SMPS）包括被配置为将周期性变化的输入AC（交流）电压转换为DC（直流）电压的整流装置，以及包括初级绕组，次级绕组和辅助绕组 。 初级绕组耦合到整流装置。 输入电容器耦合到整流装置和变压器的初级绕组。 第一电源开关耦合到输入电容器。 控制电路耦合到第一电源开关，并且被配置为基于输入AC电压的相位或幅度来控制第一功率开关。 通过控制输入电容器的充电和放电，在交流输入电压周期的较长部分期间向初级绕组提供功率，允许整流器件具有较大的导通角以增加功率因数（PF）。

公开(公告)号：US09356508B2

公开(公告)日：2016-05-31

申请号：US14033341

申请日：2013-09-20

申请人： Hu Wang ,  Yajiang Zhu ,  Ruixia Fei ,  Shuzhuang Lv

发明人： Hu Wang ,  Yajiang Zhu ,  Ruixia Fei ,  Shuzhuang Lv

IPC分类号： G05F1/56 ,  G05F3/06 ,  H02M7/66 ,  H02M3/10 ,  H02M3/156 ,  H02M7/217 ,  H02M1/00

CPC分类号： H02M3/156 ,  H02M1/08 ,  H02M3/10 ,  H02M7/2176 ,  H02M2001/0009 ,  H02M2001/0022

摘要： A control circuit is provided for a buck converter that includes at least an inductor coupled to an output of the buck converter. The control circuit includes a power switch configured for coupling to a line voltage and configured for charging the inductor, an input line voltage sampling circuit, and a constant-voltage (CV) and constant-current (CC) control module coupled to the power switch. During a charging period of the inductor, the CV and CC control module is configured to control the power switch to provide a constant output current by maintaining a constant peak inductor current, even when the input line voltage changes. During a discharging period of the inductor, the CV and CC control module is configured to monitor the sensed output voltage to control the power switch to provide a constant output voltage.

摘要翻译： 提供了一种用于降压转换器的控制电路，其包括耦合到降压转换器的输出的至少一个电感器。 控制电路包括被配置为耦合到线路电压并被配置为对电感器充电的电源开关，输入线电压采样电路和耦合到电源开关的恒压（CV）和恒流（CC）控制模块 。 在电感器的充电期间，CV和CC控制模块配置为通过保持恒定的峰值电感电流来控制电源开关以提供恒定的输出电流，即使输入线路电压发生变化。 在电感器的放电期间，CV和CC控制模块被配置为监视感测的输出电压，以控制电源开关以提供恒定的输出电压。

公开(公告)号：US08964415B2

公开(公告)日：2015-02-24

申请号：US13610790

申请日：2012-09-11

申请人： Yajiang Zhu ,  Na Liu ,  Siyuan Xu

发明人： Yajiang Zhu ,  Na Liu ,  Siyuan Xu

IPC分类号： H02M3/335

CPC分类号： H02M1/4258 ,  Y02B70/126

摘要： A switching mode power supply (SMPS) includes a rectifying device configured for converting a periodically varying input AC (alternating current) voltage into a DC (direct current) voltage, and a transformer including a primary winding, a secondary winding, and an auxiliary winding. The primary winding is coupled to the rectifying device. An input capacitor is coupled to the rectifying device and the primary winding of the transformer. A first power switch is coupled to the input capacitor. A control circuit is coupled to the first power switch and is configured to control the first power switch based on a phase or amplitude of the input AC voltage. By controlling the charging and discharging of the input capacitor, power is provided to the primary winding during a longer portion of the AC input voltage cycle, allowing the rectifier device to have a larger conduction angle to increase a power factor (PF).

摘要翻译： 开关模式电源（SMPS）包括被配置为将周期性变化的输入AC（交流）电压转换为DC（直流）电压的整流装置，以及包括初级绕组，次级绕组和辅助绕组 。 初级绕组耦合到整流装置。 输入电容器耦合到整流装置和变压器的初级绕组。 第一电源开关耦合到输入电容器。 控制电路耦合到第一电源开关，并且被配置为基于输入AC电压的相位或幅度来控制第一功率开关。 通过控制输入电容器的充电和放电，在交流输入电压周期的较长部分期间向初级绕组提供功率，允许整流器件具有较大的导通角以增加功率因数（PF）。

公开(公告)号：US20100259952A1

公开(公告)日：2010-10-14

申请号：US12421461

申请日：2009-04-09

申请人： Yajiang Zhu ,  Zheng Ying ,  Xianfeng Liu ,  Yanping Wang

发明人： Yajiang Zhu ,  Zheng Ying ,  Xianfeng Liu ,  Yanping Wang

IPC分类号： H02M3/335

CPC分类号： H02M1/36

摘要： A controller for a switching mode power supply includes two semiconductor chips. The first semiconductor chip has a high-voltage startup transistor coupled to a high-voltage supply input terminal and configured to provide a charging current in a startup phase or protection mode of a switching mode power supply (SMPS) and to provide substantially no current in a normal operation phase of the SMPS. The second semiconductor chip has a control circuit for controlling the switching mode power supply. The second semiconductor chip also has first and second on-chip high-voltage resistors coupled to the high-voltage supply input terminal and the high-voltage startup transistor in the first semiconductor chip. The first and the second on-chip high-voltage resistors are configured to provide a voltage and a current related to a voltage at the high-voltage supply input terminal.

摘要翻译： 开关电源的控制器包括两个半导体芯片。 第一半导体芯片具有耦合到高电压电源输入端子的高电压启动晶体管，并被配置为在开关模式电源（SMPS）的启动阶段或保护模式下提供充电电流，并且基本上不提供电流 SMPS的正常运行阶段。 第二半导体芯片具有用于控制开关模式电源的控制电路。 第二半导体芯片还具有耦合到第一半导体芯片中的高压电源输入端子和高压启动晶体管的第一和第二片上高压电阻器。 第一和第二片上高压电阻器被配置为提供与高压电源输入端子处的电压相关的电压和电流。

公开(公告)号：US08792258B2

公开(公告)日：2014-07-29

申请号：US12248665

申请日：2008-10-09

申请人： Yajiang Zhu ,  Ruixia Fei ,  Wenhui Dong ,  Shaohua Fang

发明人： Yajiang Zhu ,  Ruixia Fei ,  Wenhui Dong ,  Shaohua Fang

IPC分类号： H02M3/335 ,  H02M3/338

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

摘要： An apparatus for coupling a switching mode power supply (SMPS) controller to a rectified line voltage. The apparatus includes a high-voltage startup transistor configured to provide a charging current during a startup phase of the SMPS controller and to provide substantially no current during a normal operation phase of the SMPS controller. A switch coupled to the high-voltage startup transistor. The switch receives a control signal from the SMPS controller, for turning off the switch during the startup phase and turning on the switch during the normal operation phase. A biasing device is connected in series with the switch and maintains the startup transistor in an off state when the SMPS controller is in the normal operation phase. A standby current in the apparatus is substantially lower when the SMPS controller is in the normal operation phase than the charging current in the apparatus when the SMPS is in the startup phase.

摘要翻译： 一种用于将开关模式电源（SMPS）控制器耦合到整流线路电压的装置。 该装置包括高压启动晶体管，其被配置为在SMPS控制器的启动阶段期间提供充电电流，并且在SMPS控制器的正常操作阶段期间基本上不提供电流。 一个开关，耦合到高电压启动晶体管。 开关从SMPS控制器接收控制信号，在启动阶段关闭开关，并在正常运行阶段打开开关。 当SMPS控制器处于正常工作阶段时，偏置装置与开关串联连接，并将启动晶体管保持在断开状态。 当SMPS处于启动阶段时，当SMPS控制器处于正常操作阶段时，装置中的备用电流大大低于装置中的充电电流。

公开(公告)号：US08587968B2

公开(公告)日：2013-11-19

申请号：US13364269

申请日：2012-02-01

申请人： YaJiang Zhu ,  Jia Xie ,  Yongbo Zhang ,  Chao Chen ,  Shuzhuang Lv

发明人： YaJiang Zhu ,  Jia Xie ,  Yongbo Zhang ,  Chao Chen ,  Shuzhuang Lv

IPC分类号： H02M3/335

CPC分类号： H02M3/33523

摘要： A switching mode power supply (SMPS) includes a transformer having a primary winding, a secondary winding for providing an output voltage, and an auxiliary winding. The SMPS also includes a power switch coupled to the primary winding. A first control circuit is coupled to the secondary winding, and is configured to provide a first electrical signal to the secondary winding when the output voltage of the SMPS is less than a reference voltage during a discontinuous time, whereupon a second electrical signal is induced in the auxiliary winding. A second control circuit is coupled to the auxiliary winding and the power switch. The second control circuit is configured to regulate the output of the SMPS by controlling the power switch in response to a feedback voltage signal from the auxiliary winding, and is further configured to turn on the power switch in response to the second electrical signal.

摘要翻译： 开关模式电源（SMPS）包括具有初级绕组的变压器，用于提供输出电压的次级绕组和辅助绕组。 SMPS还包括耦合到初级绕组的电源开关。 第一控制电路耦合到次级绕组，并且被配置为当在不连续时间期间SMPS的输出电压小于参考电压时，向次级绕组提供第一电信号，由此在第二电信号中引入第二电信号 辅助绕组。 第二控制电路耦合到辅助绕组和电源开关。 第二控制电路被配置为通过响应于来自辅助绕组的反馈电压信号控制功率开关来调节SMPS的输出，并且还被配置为响应于第二电信号而接通功率开关。

公开(公告)号：US20130088898A1

公开(公告)日：2013-04-11

申请号：US13436779

申请日：2012-03-30

申请人： XIAORU GAO ,  YAJIANG ZHU ,  CHAO CHEN ,  MEILING ZHANG

发明人： XIAORU GAO ,  YAJIANG ZHU ,  CHAO CHEN ,  MEILING ZHANG

IPC分类号： H02M3/335

CPC分类号： H02M3/335 ,  H02M3/33507 ,  H02M2001/0032 ,  Y02B70/16

摘要： A switching mode power supply (SMPS) includes a power transistor coupled to the primary winding of transformer and a resistor coupled between the input power source and a control terminal of the power transistor for triggering a primary current flow through the power transistor for providing startup power. A primary side control circuit is configured to regulate the output of the SMPS. A secondary side control circuit is coupled to the secondary winding and being configured to provide a first electrical signal to the secondary winding when an output voltage of the SMPS is less than a first reference voltage, whereupon an awakening signal is induced in the auxiliary winding and causes the primary side control circuit to provide a turn-on signal to the power transistor. The primary side control circuit is configured to enter a standby mode or a normal operating mode in response to the awakening signal.

摘要翻译： 开关模式电源（SMPS）包括耦合到变压器的初级绕组的功率晶体管和耦合在输入电源和功率晶体管的控制端之间的电阻器，用于触发通过功率晶体管的初级电流以提供启动功率 。 初级侧控制电路被配置为调节SMPS的输出。 次级侧控制电路耦合到次级绕组，并且被配置为当SMPS的输出电压小于第一参考电压时，向次级绕组提供第一电信号，于是在辅助绕组中感应出唤醒信号， 使得初级侧控制电路向功率晶体管提供导通信号。 初级侧控制电路被配置为响应于唤醒信号进入待机模式或正常操作模式。

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：US08897039B2

公开(公告)日：2014-11-25

申请号：US12136760

申请日：2008-06-10

申请人： Yajiang Zhu ,  Tao Peng ,  Ruixia Fei ,  Shaohua Fang

发明人： Yajiang Zhu ,  Tao Peng ,  Ruixia Fei ,  Shaohua Fang

IPC分类号： H02M3/335 ,  H02M1/44 ,  H03K7/06 ,  H03K5/1532 ,  H03K17/16

CPC分类号： H02M3/33523 ,  H02M1/44 ,  H03K5/1532 ,  H03K7/06 ,  H03K17/16

摘要： A pulse frequency modulation (PFM) controller for controlling a switching mode power supply. The controller includes an output terminal for providing a control signal to turn on and off a current in the power supply to regulate an output of the power supply. A first input terminal receives a feedback signal related to the output of the power supply, the feedback signal exhibiting a ringing waveform when the current in the power supply is turned off. The controller also includes a control circuit configured to provide the control signal in response to the feedback signal. The control signal is adapted to turn on the current in the power supply when the feedback signal is substantially at a valley of the ringing waveform of the feedback signal. In an embodiment, such a PFM controller can reduce turn-on transition loss in a power supply and provides frequency dithering to reduce electromagnetic interference.

摘要翻译： 用于控制开关模式电源的脉冲频率调制（PFM）控制器。 该控制器包括输出端子，用于提供控制信号以接通和关断电源中的电流以调节电源的输出。 第一输入端子接收与电源的输出相关的反馈信号，当电源中的电流关闭时，反馈信号呈现振铃波形。 该控制器还包括控制电路，该控制电路被配置为响应于反馈信号提供控制信号。 当反馈信号基本上处于反馈信号的振铃波形的谷谷时，控制信号适于接通电源中的电流。 在一个实施例中，这样的PFM控制器可以减少电源中的导通过渡损耗并提供频率抖动以减少电磁干扰。