公开(公告)号：US08908396B2

公开(公告)日：2014-12-09

申请号：US13611091

申请日：2012-09-12

申请人： Ta-Yung Yang ,  Li Lin ,  Yue-Hong Tang ,  Jung-Sheng Chen

发明人： Ta-Yung Yang ,  Li Lin ,  Yue-Hong Tang ,  Jung-Sheng Chen

IPC分类号： H02M3/335 ,  H02M1/00

CPC分类号： H02M3/33507 ,  H02M2001/0003

摘要： A control circuit of the power converter according to the present invention comprises a feedback circuit, an output circuit and an adaptive clamping circuit. The feedback circuit generates a feedback signal in accordance with an 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 adaptive clamping circuit limits the level of the feedback signal under a first level for a first load condition. The feedback circuit determines a slew rate of the feedback signal for increasing the level of the feedback signal from the first level to a second level. The adaptive clamping circuit is disabled and the level of the feedback signal can be increased to the second level for a second load condition.

摘要翻译： 根据本发明的功率转换器的控制电路包括反馈电路，输出电路和自适应钳位电路。 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。 自适应钳位电路在第一负载条件下将反馈信号的电平限制在第一电平。 反馈电路确定用于将反馈信号的电平从第一电平增加到第二电平的反馈信号的转换速率。 自适应钳位电路被禁用，并且反馈信号的电平可以在第二负载条件下增加到第二电平。

公开(公告)号：US08664998B2

公开(公告)日：2014-03-04

申请号：US13336141

申请日：2011-12-23

申请人： Ta-Yung Yang ,  Li Lin ,  Jung-Sheng Chen ,  Chih-Hsien Hsieh ,  Yue-Hong Tang

发明人： Ta-Yung Yang ,  Li Lin ,  Jung-Sheng Chen ,  Chih-Hsien Hsieh ,  Yue-Hong Tang

IPC分类号： H03K5/00

CPC分类号： H02M1/34 ,  H02M2001/344

摘要： An adaptive filter circuit for sampling a reflected voltage of a transformer of a power converter includes a first switch for receiving the reflected voltage, a resistor having a first terminal and a second terminal, the first terminal of the resistor being coupled to the first switch, a capacitor coupled to the second terminal of the resistor for holding the reflected voltage, and a second switch coupled to the resistor in parallel, wherein the resistor and the capacitor develop a filter for sampling the reflected voltage which is sampled without filtering by the filter in a first period during a disable period of a switching signal and also sampled with filtering by the filter in a second period during the disable period of the switching signal.

摘要翻译： 用于对功率转换器的变压器的反射电压进行采样的自适应滤波器电路包括用于接收反射电压的第一开关，具有第一端子和第二端子的电阻器，电阻器的第一端子耦合到第一开关， 耦合到所述电阻器的所述第二端子以保持所述反射电压的电容器，以及并联耦合到所述电阻器的第二开关，其中所述电阻器和所述电容器形成滤波器，用于对所述滤波器进行采样而不被所述滤波器滤波 在开关信号的禁止期间内的第一期间，并且在开关信号的禁止期间内，在第二期间通过滤波器进行滤波而进行采样。

公开(公告)号：US08934266B2

公开(公告)日：2015-01-13

申请号：US13591207

申请日：2012-08-21

申请人： Ta-Yung Yang ,  Li Lin ,  Yue-Hong Tang

发明人： Ta-Yung Yang ,  Li Lin ,  Yue-Hong Tang

IPC分类号： H02M3/335

CPC分类号： H02M3/335 ,  H02M2001/0022 ,  H02M2001/0025

摘要： A method for controlling a power converter is provided. The method includes the following steps. A switching signal coupled to switch a transformer for regulating the output of the power converter is generated in accordance with a feedback signal and a ramp signal. The ramp signal is generated in accordance with a switching current signal and a slope compensation signal. The slope compensation signal is generated in response to an input voltage signal. The input voltage signal is generated in response to the level of the input voltage of the power converter. The feedback signal is generated in accordance with the output of the power converter, and the switching current signal is correlated with a switching current of the transformer.

摘要翻译： 提供一种用于控制功率转换器的方法。 该方法包括以下步骤。 根据反馈信号和斜坡信号产生耦合以切换用于调节功率转换器的输出的变压器的开关信号。 斜坡信号根据开关电流信号和斜率补偿信号产生。 斜坡补偿信号是根据输入电压信号产生的。 响应于功率转换器的输入电压的电平而产生输入电压信号。 反馈信号根据功率转换器的输出产生，开关电流信号与变压器的开关电流相关。

公开(公告)号：US20130051098A1

公开(公告)日：2013-02-28

申请号：US13591207

申请日：2012-08-21

申请人： Ta-Yung Yang ,  Li Lin ,  Yue-Hong Tang

发明人： Ta-Yung Yang ,  Li Lin ,  Yue-Hong Tang

IPC分类号： H02M7/44

CPC分类号： H02M3/335 ,  H02M2001/0022 ,  H02M2001/0025

摘要： A method for controlling a power converter is provided. The method includes the following steps. A switching signal coupled to switch a transformer for regulating the output of the power converter is generated in accordance with a feedback signal and a ramp signal. The ramp signal is generated in accordance with a switching current signal and a slope compensation signal. The slope compensation signal is generated in response to an input voltage signal. The input voltage signal is generated in response to the level of the input voltage of the power converter. The feedback signal is generated in accordance with the output of the power converter, and the switching current signal is correlated with a switching current of the transformer.

摘要翻译： 提供一种用于控制功率转换器的方法。 该方法包括以下步骤。 根据反馈信号和斜坡信号产生耦合以切换用于调节功率转换器的输出的变压器的开关信号。 斜坡信号根据开关电流信号和斜率补偿信号产生。 斜坡补偿信号是根据输入电压信号产生的。 响应于功率转换器的输入电压的电平而产生输入电压信号。 反馈信号根据功率转换器的输出产生，开关电流信号与变压器的开关电流相关。

公开(公告)号：US07965528B2

公开(公告)日：2011-06-21

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： H02M3/24 ,  H02M3/335 ,  H02M7/44

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。

公开(公告)号：US08488338B2

公开(公告)日：2013-07-16

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： H02M3/335

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：US09093918B2

公开(公告)日：2015-07-28

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： H02M1/42 ,  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：US08749999B2

公开(公告)日：2014-06-10

申请号：US13344134

申请日：2012-01-05

申请人： Ta-Yung Yang ,  Keun-Eul Hong ,  Jung-Sheng Chen ,  Ju-hyun Kim

发明人： Ta-Yung Yang ,  Keun-Eul Hong ,  Jung-Sheng Chen ,  Ju-hyun Kim

IPC分类号： H02M3/335 ,  H02H7/122

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：US09007786B2

公开(公告)日：2015-04-14

申请号：US13348963

申请日：2012-01-12

申请人： Ta-Yung Yang ,  Li Lin ,  Chao-Chih Lin

发明人： Ta-Yung Yang ,  Li Lin ,  Chao-Chih Lin

IPC分类号： H02M3/335 ,  H02M1/00

CPC分类号： H02M3/33507 ,  H02M2001/0022

摘要： The present invention proposes a switching controller of a flyback power converter. The switching controller includes a switching circuit, a sample-and-hold circuit, a voltage detection circuit, an oscillation circuit, and a comparator. The voltage detection circuit generates a holding signal when a level of an input voltage of the flyback power converter is lower than a low-threshold. The oscillation circuit limits the maximum frequency of switching signal. The maximum frequency is increased in response to a decrement of a modulation signal. The modulation signal correlated with a level of the input voltage is used to generate a control signal when the level of the input voltage is lower than an ultra-low-threshold. The control signal is enabled to operate the flyback power converter in continuous current mode operation. Therefore, an input capacitor can be eliminated and manufacturing cost is saved.

摘要翻译： 本发明提出了一种反激式功率转换器的开关控制器。 开关控制器包括开关电路，采样保持电路，电压检测电路，振荡电路和比较器。 当反激式功率转换器的输入电压的电平低于低阈值时，电压检测电路产生保持信号。 振荡电路限制开关信号的最大频率。 响应于调制信号的减少，最大频率增加。 当输入电压的电平低于超低阈值时，与输入电压的电平相关的调制信号用于产生控制信号。 控制信号使能在连续电流模式下操作反激式功率转换器。 因此，可以消除输入电容器并节省制造成本。

公开(公告)号：US08432109B2

公开(公告)日：2013-04-30

申请号：US13073095

申请日：2011-03-28

申请人： Ta-Yung Yang ,  Li Lin ,  Chih-Hsien Hsieh ,  Chuh-Ching Li ,  Chi-Yin Lo ,  Kuo-Hsiem Huang

发明人： Ta-Yung Yang ,  Li Lin ,  Chih-Hsien Hsieh ,  Chuh-Ching Li ,  Chi-Yin Lo ,  Kuo-Hsiem Huang

IPC分类号： H05B37/02

CPC分类号： H05B33/0815

摘要： A control circuit of a LED driver according to the present invention comprises an output circuit, an input circuit and an input-voltage detection circuit. The output circuit generates a switching signal to produce an output current for driving at least one LED in response to a feedback signal. The switching signal is coupled to switch a transformer. The input circuit samples an input signal for generating the feedback signal. The input signal is correlated to the output current of the LED driver. The input-voltage detection circuit generates an input-voltage signal in response to an input voltage of the LED driver. The input circuit will not sample the input signal when the input-voltage signal is lower than a threshold. The control circuit can eliminate the need of the input capacitor for improving the reliability of the LED driver.

摘要翻译： 根据本发明的LED驱动器的控制电路包括输出电路，输入电路和输入电压检测电路。 输出电路产生开关信号以产生用于响应于反馈信号驱动至少一个LED的输出电流。 开关信号被耦合以切换变压器。 输入电路对输入信号进行采样以产生反馈信号。 输入信号与LED驱动器的输出电流相关。 输入电压检测电路根据LED驱动器的输入电压产生输入电压信号。 当输入电压信号低于阈值时，输入电路不会对输入信号进行采样。 控制电路可以消除输入电容器的需要，提高LED驱动器的可靠性。