Control device and control method
AssigneeDelta Electronics (Shanghai) Co., Ltd.
InventorsHaibin SONG, Jinfa ZHANG, Daofei XU
Life of this patent
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Abstract
A control device, which is applied to a flyback converter including an auxiliary switch, includes: an on-time setter, configured to set an on-time threshold according to a reference value and an output voltage of the flyback converter; and an on-time controller, configured to output a control signal to turn on the auxiliary switch, and turn off the auxiliary switch when on-time of the auxiliary switch reaches the on-time threshold. 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, the flyback converter comprising an auxiliary switch, the control device comprising:
- an on-time setter, configured to set an on-time threshold according to a reference value and an output voltage of the flyback converter;
- and
- an on-time controller, configured to output a control signal to turn on the auxiliary switch, and to turn off the auxiliary switch when on-time of the auxiliary switch reaches the on-time threshold.
A switching power supply, comprising the control device applied to a flyback converter comprising an auxiliary switch, wherein the control device comprises:
- an on-time setter, configured to set an on-time threshold according to a reference value and an output voltage of the flyback converter;
- and
- an on-time controller, configured to output a control signal to turn on the auxiliary switch, and to turn off the auxiliary switch when on-time of the auxiliary switch reaches the on-time threshold.
A control method, applied to a flyback converter, the flyback converter comprising an auxiliary switch, the control method comprising steps:
- (a) detecting an output voltage of the flyback converter, and setting an on-time threshold according to the output voltage and a reference value;
- and
- (b) turning on the auxiliary switch according to a control signal, and turning off the auxiliary switch when on-time of the auxiliary switch reaches the on-time threshold.
Dependencies are inferred from the claim text.