Invention Application
- Patent Title: PRIMARY-SIDE CONTROLLED FLYBACK POWER CONVERTER
- Patent Title (中): 主要控制的回转电源转换器
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Application No.: US10629103Application Date: 2003-07-28
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Publication No.: US20050024898A1Publication Date: 2005-02-03
- Inventor: Ta-Yung Yang , Jenn-Yu Lin , Chern-Lin Chen
- Applicant: Ta-Yung Yang , Jenn-Yu Lin , Chern-Lin Chen
- Main IPC: H02M3/335
- IPC: H02M3/335 ; H02M7/00

Abstract:
The present invention provides a primary-side flyback power converter that supplies a constant voltage output and a constant current output. To generate a well-regulated output voltage under varying load conditions, a PWM controller is included in the power converter in order to generate a PWM signal controlling a switching transistor in response to a flyback voltage sampled from a first primary winding of the power supply transformer. Several improvements are included in this present invention to overcome the disadvantages of prior-art flyback power converters. Firstly, the flyback energy of the first primary winding is used as a DC power source for the PWM controller in order to reduce power consumption. A double sample amplifier samples the flyback voltage just before the transformer current drops to zero. Moreover, an offset current is pulled from a detection input of the double sample amplifier in order to generate a more accurate DC output voltage. The offset current is generated in response to the temperature in order to compensate for temperature-induced voltage fluctuations across the output rectifier. Ultimately, in order to maintain a constant output current, the PWM controller modulates the switching frequency in response to the output voltage.
Public/Granted literature
- US06853563B1 Primary-side controlled flyback power converter Public/Granted day:2005-02-08
Information query
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