CONTROL DEVICE AND CONTROL METHOD
First Claim
1. 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.
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Accused Products
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.
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Citations
29 Claims
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1. A control device, applied to a flyback converter, the flyback converter comprising an auxiliary switch, the control device comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A switching power supply, comprising the control device applied to a flyback converter comprising an auxiliary switch, wherein the control device comprises:
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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.
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15. A control method, applied to a flyback converter, the flyback converter comprising an auxiliary switch, the control method comprising steps:
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(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. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification