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CONTROL METHOD AND DEVICE EMPLOYING PRIMARY SIDE REGULATION IN A QUASI-RESONANT AC/DC FLYBACK CONVERTER
CONTROL METHOD AND DEVICE EMPLOYING PRIMARY SIDE REGULATION IN A QUASI-RESONANT AC/DC FLYBACK CONVERTER
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机译:准谐振AC / DC反激转换器中采用初级侧调节的控制方法和装置
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摘要
The present disclosure is directed to a primary-controlled high power factor quasi resonant converter. The converter converts an AC power line input to a DC output to power a load, generally a string of LEDs, and may be compatible with phase-cut dimmers. The power input is fed into a transformer being controlled by a power switch. The power switch is driven by a controller having a shaping circuit. The shaping circuit uses a current generator, switched resistor and capacitor to produce a reference voltage signal. The controller drives the power switch based on the voltage reference signal, resulting in a sinusoidal input current in a primary winding of the transformer, resulting in high power factor and low total harmonic distortion for the converter.
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