CPC H02M 3/33571 (2021.05) [H02M 3/01 (2021.05)] | 20 Claims |
1. A control circuit for a resonant converter having at least two output signals, the control circuit comprising:
a) a charge feedback circuit configured to generate a charge feedback signal representing a resonant current of a resonant circuit in the resonant converter;
b) a switching control signal generating circuit configured to generate switching control signals according to the charge feedback signal and feedback signals representing error information of each of the at least two output signals;
c) wherein the resonant converter comprises a switch circuit for generating a periodic square wave voltage to drive the resonant circuit;
d) wherein when a first switch unit in the switch circuit is turned on, energy on a primary side of a transformer is transmitted to a first output terminal through a first secondary winding;
e) wherein when a second switch unit in the switch circuit is turned on, energy on the primary side of the transformer is transmitted to a second output terminal through a second secondary winding;
f) wherein the first output terminal generates a first output signal, and the second output terminal generates a second output signal; and
g) wherein the first output terminal is coupled to a dotted terminal of the first secondary winding, and the second output terminal is coupled to a non-dotted terminal of the second secondary winding.
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