Patent ID: 9337741
Filing Date: 2016-05-10
CPC Classification: H02M,Y02B

Claim Text:
1. A direct current (DC)-DC conversion circuit, comprising a processor configured to: detect an output voltage of the DC-DC conversion circuit; generate a feedback voltage signal in a linear relationship with the output voltage; detect a voltage at a secondary winding end of a transformer in the DC-DC conversion circuit; generate an input voltage signal in a linear relationship with the voltage at the secondary winding end; generate the reference voltage according to the input voltage signal; compare the feedback voltage signal and the reference voltage; generate a duty cycle control signal according to the comparison result; and drive a switching transistor in the DC-DC conversion circuit according to the duty cycle control signal, wherein the reference voltage is in a linearly proportional relationship with the input voltage signal and the feedback voltage signal, wherein the linearly proportional relationship is V wherein V wherein Vin_dec is the input voltage signal, wherein D is a working duty cycle of the switching transistor in the DC-DC conversion circuit, wherein N is a turns ratio of a primary winding to a secondary winding of the transformer in the DC-DC conversion circuit, and wherein K is a constant.