Control device and control method
AssigneeDelta Electronics (Shanghai) Co., Ltd.
InventorsHaibin SONG, Jinfa ZHANG, Daofei XU
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Abstract
A control device applied to a flyback converter including an auxiliary switch includes: a current detector configured to detect an amplitude of a current of the flyback converter to obtain an amplitude of a negative magnetizing current of the flyback converter; and a comparator controller configured to compare the amplitude of the negative magnetizing current obtained by the current detector with a reference value, and turn off the auxiliary switch according to a comparison result. According to the present disclosure, it is able to achieve zero-voltage switching of a primary-side switch of the flyback converter with variable outputs.
Claims29
A control device, applied to a flyback converter comprising an auxiliary switch, comprising:
- a current detector configured to detect an amplitude of a current of the flyback converter to obtain an amplitude of a negative magnetizing current of the flyback converter;
- and
- a comparator controller configured to compare the amplitude of the negative magnetizing current obtained by the current detector with a reference value, and turn off the auxiliary switch according to a comparison result.
A switching power supply, comprising a control device applied to a flyback converter comprising an auxiliary switch, wherein the control device comprises:
- a current detector configured to detect an amplitude of a current of the flyback converter to obtain an amplitude of a negative magnetizing current of the flyback converter;
- and
- a comparator controller configured to compare the amplitude of the negative magnetizing current obtained by the current detector with a reference value, and turn off the auxiliary switch according to a comparison result.
A control method, applied to a flyback converter comprising an auxiliary switch, comprising:
- detecting an amplitude of a current of the flyback converter to obtain an amplitude of a negative magnetizing current of the flyback converter;
- comparing the amplitude of the negative magnetizing current with a reference value;
- and
- turning off the auxiliary switch according to a comparison result to achieve zero-voltage switching of a primary-side power switch of the flyback converter.
Dependencies are inferred from the claim text.