公开(公告)号：US20130027988A1

公开(公告)日：2013-01-31

申请号：US13348963

申请日：2012-01-12

Applicant: Ta-Yung YANG ,  Li LIN ,  Chao-Chih LIN

Inventor： Ta-Yung YANG ,  Li LIN ,  Chao-Chih LIN

IPC: H02M3/335

CPC classification number: H02M3/33507 ,  H02M2001/0022

Abstract: 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.

Abstract translation: 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：US20110305053A1

公开(公告)日：2011-12-15

申请号：US12962948

申请日：2010-12-08

Applicant: Chao-Chih Lin ,  Ying-Chieh Su ,  Jhih-Da Hsu ,  Chia-Yo Yeh ,  Wei-Ting Wang

Inventor： Chao-Chih Lin ,  Ying-Chieh Su ,  Jhih-Da Hsu ,  Chia-Yo Yeh ,  Wei-Ting Wang

IPC: H02M7/44

CPC classification number: H02M1/44 ,  H02M3/33523 ,  H02M2001/0048 ,  Y02B70/1491

Abstract: A switching control circuit for a switching power converter is provided. The switching control circuit is coupled to a switching device and an auxiliary winding of a transformer. The switching control circuit includes a valley detecting circuit, a valley lock circuit, and a PWM circuit. The valley detecting circuit is coupled to receive a reflected voltage signal from the auxiliary winding of the transformer for outputting a control signal in response to the reflected voltage signal. The valley lock circuit is coupled to receive the control signal for outputting a judging signal in response to the control signal during a first period and a second period following the first period. The PWM circuit outputs a switching signal in response to the judging signal.

Abstract translation: 提供了一种用于开关电源转换器的开关控制电路。 开关控制电路耦合到变压器的开关装置和辅助绕组。 开关控制电路包括谷值检测电路，谷值锁定电路和PWM电路。 谷检测电路被耦合以接收来自变压器的辅助绕组的反射电压信号，以响应于反射电压信号输出控制信号。 谷锁电路被耦合以接收控制信号，用于在第一周期和第一周期之后的第一周期期间响应于控制信号输出判断信号。 PWM电路响应判断信号输出开关信号。