发明名称 |
Controller with valley switching and limited maximum frequency for quasi-resonant power converters |
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.
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申请公布号 |
US8488338(B2) |
申请公布日期 |
2013.07.16 |
申请号 |
US201113009639 |
申请日期 |
2011.01.19 |
申请人 |
YANG TA-YUNG;CHEN JUNG-SHENG;LIN LI;SYSTEM GENERAL CORPORATION |
发明人 |
YANG TA-YUNG;CHEN JUNG-SHENG;LIN LI |
分类号 |
H02M3/335 |
主分类号 |
H02M3/335 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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