Westman, Champlin & Koehler, P.A.
Control circuit, control method and flyback converter of primary-side feedback control thereof
The disclosure relates to a control circuit, a control method and a flyback converter of primary-side feedback control including the control circuit. When an input voltage is greater than a predetermined threshold, a peak value of an input current of the flyback converter is controlled to vary with the input voltage by the switching control signal. When the input voltage is less than the predetermined threshold, the peak value of the input current is controlled to be increased by the switching control signal to make demagnetization time of a secondary winding of the flyback converter be greater than a minimum time. Thus, the peak value of the primary-side current may not become too small because of a decreased input voltage, further avoiding occurrence of an error sampling after a blanking time due to excessive variations in demagnetization time.
SILERGY SEMICONDUCTOR TECHNOLOGY (HANGZHOU) LTD.
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H02M H02M Y02B H02M H02M
additional inventional additional inventional additional
Jianxin Huiqiang
Wang Chen