公开(公告)号：US20130094253A1

公开(公告)日：2013-04-18

申请号：US13604339

申请日：2012-09-05

申请人： Ta-Yung YANG ,  Chih-Hsien HSIEH ,  Jung-Sheng CHEN

发明人： Ta-Yung YANG ,  Chih-Hsien HSIEH ,  Jung-Sheng CHEN

IPC分类号： H02M3/335

CPC分类号： H02M1/4258 ,  H02M3/33507 ,  Y02B70/126

摘要： The present invention provides a control circuit for a power converter. The control circuit includes a switching circuit, an input-voltage detection circuit and a current-limit threshold. The switching circuit generates a switching signal coupled to switch a transformer of the power converter for regulating an output of the power converter in response to a feedback signal. The input-voltage detection circuit generates a control signal when an input voltage of the power converter is lower than a low-input threshold. The feedback signal is generated in response to the output of the power converter. A maximum duty of the switching signal is increased in response to the control signal. The current-limit threshold is for limiting a maximum value of a switching current flowing through the transformer. The current-limit threshold is increased in response to the control signal. An input of the power converter doesn't connect with electrolytic bulk capacitors.

摘要翻译： 本发明提供了一种用于功率转换器的控制电路。 控制电路包括开关电路，输入电压检测电路和限流阈值。 开关电路产生耦合以切换功率转换器的变压器的开关信号，用于响应于反馈信号调节功率转换器的输出。 当电力转换器的输入电压低于低输入阈值时，输入电压检测电路产生控制信号。 响应于功率转换器的输出产生反馈信号。 开关信号的最大占空比响应于控制信号而增加。 限流阈值用于限制流过变压器的开关电流的最大值。 响应于控制信号增加限流阈值。 电源转换器的输入不与电解大容量电容器连接。

公开(公告)号：US20120069608A1

公开(公告)日：2012-03-22

申请号：US13182839

申请日：2011-07-14

申请人： Ta-Yung YANG ,  Jung-Sheng CHEN ,  Chuh-Ching LI ,  Chih-Hsien HSIEH

发明人： Ta-Yung YANG ,  Jung-Sheng CHEN ,  Chuh-Ching LI ,  Chih-Hsien HSIEH

IPC分类号： H02M3/335

CPC分类号： H02M3/33507 ,  H02M2001/0035 ,  H02M2001/0054 ,  Y02B70/1433 ,  Y02B70/1491 ,  Y02B70/16

摘要： A control circuit for power converter according to the present invention comprises a PWM circuit generating a switching signal coupled to switch a transformer of the power converter. A feedback input circuit is coupled to an output of the power converter for generating a feedback signal. The feedback signal is coupled to turn off the switching signal. A detection circuit is coupled to the transformer for generating a valley signal in response to a waveform of the transformer. A frequency-variation circuit is coupled to receive the feedback signal and the valley signal for generating a frequency-variation signal. The frequency-variation signal is coupled to turn on the switching signal. A burst circuit is coupled to receive the feedback signal for generating a burst signal to disable the switching signal.

摘要翻译： 根据本发明的用于功率转换器的控制电路包括PWM电路，其产生耦合以切换功率转换器的变压器的开关信号。 反馈输入电路耦合到功率转换器的输出端，用于产生反馈信号。 反馈信号被耦合以关闭开关信号。 检测电路耦合到变压器，以响应于变压器的波形产生谷值信号。 频率变化电路被耦合以接收反馈信号和谷值信号以产生频率变化信号。 频率变化信号被耦合以接通开关信号。 突发电路被耦合以接收反馈信号以产生突发信号以禁用开关信号。

公开(公告)号：US20130063112A1

公开(公告)日：2013-03-14

申请号：US13344134

申请日：2012-01-05

申请人： Ta-Yung YANG ,  Keun-Eui HONG ,  Jung-Sheng CHEN ,  Juh-Yun KIM

发明人： Ta-Yung YANG ,  Keun-Eui HONG ,  Jung-Sheng CHEN ,  Juh-Yun KIM

IPC分类号： G05F1/10

CPC分类号： H02M3/33523 ,  H02M1/32 ,  H02M2001/0019 ,  H02M2001/0032 ,  Y02B70/16

摘要： A controller of a power converter is provided. The controller includes a feedback circuit, an output circuit, and a clamping circuit. The feedback circuit generates a feedback signal in accordance with output of the power converter. The output circuit generates a switching signal in accordance with the feedback signal for regulating the output of the power converter. The clamping circuit limits the feedback signal under a first level for a first load condition and limits the feedback signal under a second level for a second load condition. The clamping circuit includes a timer circuit. The timer circuit determines a slew rate of the feedback signal for increasing the feedback signal from the first level to the second level, and the second level is higher than the first level.

摘要翻译： 提供电源转换器的控制器。 控制器包括反馈电路，输出电路和钳位电路。 反馈电路根据功率转换器的输出产生反馈信号。 输出电路根据用于调节功率转换器的输出的反馈信号产生开关信号。 钳位电路将反馈信号限制在第一级的第一负载条件下，并将反馈信号限制在第二级的第二负载条件。 钳位电路包括定时器电路。 定时器电路确定用于将反馈信号从第一电平增加到第二电平的反馈信号的转换速率，并且第二电平高于第一电平。

公开(公告)号：US20120081084A1

公开(公告)日：2012-04-05

申请号：US13009639

申请日：2011-01-19

申请人： Ta-Yung YANG ,  Jung-Sheng CHEN ,  Li LIN

发明人： Ta-Yung YANG ,  Jung-Sheng CHEN ,  Li LIN

IPC分类号： G05F1/575

CPC分类号： H02M3/33507 ,  H02M2001/0035 ,  Y02B70/1433 ,  Y02B70/16

摘要： A controller for a power converter is provided. The controller includes a PWM circuit, a detection circuit, a signal generation circuit and an oscillation circuit. The PWM circuit generates a switching signal coupled to switch a transformer of the power converter. A feedback signal is coupled to the PWM circuit to disable the switching signal. The detection circuit is coupled to the transformer via a resistor for generating a valley signal in response to a signal waveform of the transformer. The signal generation circuit is coupled to receive the feedback signal and the valley signal for generating an enabling signal. The oscillation circuit generates a maximum frequency signal. The maximum frequency signal associates with the enabling signal to generate a pulse signal. The feedback signal is correlated to an output load of the power converter. The maximum frequency of the pulse signal is limited.

摘要翻译： 提供一种用于功率转换器的控制器。 控制器包括PWM电路，检测电路，信号发生电路和振荡电路。 PWM电路产生耦合以切换功率转换器的变压器的开关信号。 反馈信号耦合到PWM电路以禁用开关信号。 检测电路经由电阻器耦合到变压器，用于响应于变压器的信号波形产生谷值信号。 信号发生电路被耦合以接收反馈信号和谷信号以产生使能信号。 振荡电路产生最大频率信号。 最大频率信号与使能信号相关联以产生脉冲信号。 反馈信号与功率转换器的输出负载相关。 脉冲信号的最大频率受到限制。

公开(公告)号：US20090310388A1

公开(公告)日：2009-12-17

申请号：US12255089

申请日：2008-10-21

申请人： Ta-Yung YANG ,  Chuh-Ching LI ,  Sheng-Fu HSU ,  Li LIN ,  Jung-Sheng CHEN

发明人： Ta-Yung YANG ,  Chuh-Ching LI ,  Sheng-Fu HSU ,  Li LIN ,  Jung-Sheng CHEN

IPC分类号： H02M3/335

CPC分类号： H02M3/33507 ,  G01R19/0092 ,  G01R31/40

摘要： An apparatus for detecting a switching current of the power converter, wherein the apparatus includes a signal generation circuit, a sample-and-hold circuit, and a calculating circuit. The signal generation circuit generates a sample signal in accordance with the pulse width of a switching signal. The sample-and-hold circuit is coupled to receive the sample signal and switching current signal for generating a first current signal and a second current signal. The calculating circuit is coupled to receive the first current signal and the second current signal for generating output signals. The switching signal is used for switching the magnetic device of the power converter, and the switching current signal is correlated to the switching current of the power converter; the output signals are correlated to the value of the switching current of the power converter.

摘要翻译： 一种用于检测功率转换器的开关电流的装置，其中所述装置包括信号产生电路，采样保持电路和计算电路。 信号生成电路根据切换信号的脉冲宽度生成采样信号。 采样和保持电路被耦合以接收采样信号和开关电流信号，用于产生第一电流信号和第二电流信号。 计算电路被耦合以接收第一电流信号和第二电流信号以产生输出信号。 开关信号用于切换功率转换器的磁性装置，开关电流信号与功率转换器的开关电流相关; 输出信号与功率转换器的开关电流的值相关。