CPC H02M 3/33592 (2013.01) [H02M 3/33523 (2013.01); H02M 1/0009 (2021.05); Y02B 70/10 (2013.01)] | 5 Claims |
1. A control circuit for controlling a switch coupled to a secondary winding of a transformer, the control circuit comprising:
a logic circuit having first and second logic inputs, a setpoint voltage reference input, a threshold voltage reference input, and a logic output, the first logic input adapted to be coupled to a first terminal of the secondary winding, the second logic input adapted to be coupled to a second terminal of the secondary winding, the logic output adapted to be coupled to a control terminal of the switch, and the logic circuit configured to:
close the switch a first time during a first power transfer cycle by providing a first control at the logic output responsive to the first logic input;
open the switch during the first power transfer cycle in response to detecting a current of the secondary winding returning to zero; and
close the switch a second time responsive to a positive voltage spike at the second logic input during the first power transfer cycle.
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