Patent ID: 9379622
Filing Date: 2016-06-28
CPC Classification: H02M,Y02B

Claim Text:
1. A power converter, comprising: a power transformer configured to transform an input voltage into a switching voltage; a rectifier diode and a synchronization switch, one node of the rectifier diode and a first node of the synchronization switch are coupled to a secondary side of the power transformer, and the other node of the rectifier diode and a second node of the synchronization switch are coupled to an output node of the power converter; and a control circuit coupled to the rectifier diode and the synchronization switch which is configured to generate a gate signal to control on and off states of the synchronization switch in responsive to a detection signal received from the secondary side of the power transformer, so that an output of the power converter is generated in accordance with the switching voltage and the gate signal, wherein the control circuit comprising: a comparison circuit coupled to a first voltage generation circuit and a second voltage generation circuit which is configured to compare a voltage signal generated by the first voltage generation circuit and a comparison signal generated by the second voltage generation circuit to output a comparison result; and a logic circuit, coupled to the comparison circuit which is configured to output the gate signal in accordance with the detection signal and the comparison result, wherein the comparison circuit comprising: a comparator, a positive input terminal of the comparator is connected to an output node of the first voltage generation circuit, a negative input terminal of the comparator is connected to an output node of a second buffer, wherein the comparator compares the voltage signal and the comparison signal, and outputs the comparison result to the logic circuit.