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: an output voltage integrator, configured to integrate an output voltage 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 obtained amplitude of the negative magnetizing current 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.
Claims27
A control device, applied to a flyback converter, the flyback converter comprising an auxiliary switch, the control device comprising:
- an output voltage integrator, configured to integrate an output voltage 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 obtained amplitude of the negative magnetizing current 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:
- an output voltage integrator, configured to integrate an output voltage 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 obtained amplitude of the negative magnetizing current with a reference value, and turn off the auxiliary switch according to a comparison result.
A control method, applied to a flyback converter, the flyback converter comprising an auxiliary switch, the control method comprising:
- integrating an output voltage 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.