Patent ID: 9559593
Date: 2017-01-31
CPC Classifications: H02M,Y02B

Claim:
1. A synchronous rectification converter comprising: an inductor; a first switching element coupled between one end of the inductor and one end of an input terminal; a second switching element coupled between the one end of the inductor and the other end of the input terminal; a capacitive element coupled between the other end of the inductor and the other end of the input terminal; a control circuit that detects voltages of the inductor and the capacitive element and outputs a control signal that makes the first switching element and the second switching element alternately conductive, based on the detected voltages; a current inversion detection circuit that detects inversion of a direction in which a current supplied from the second switching element to the inductor flows and outputs an inversion signal; a delay circuit that delays the inversion signal and outputs a delay inversion signal; a synchronous rectification reset circuit that changes the control signal in accordance with the delay inversion signal such that the second switching element is turned off; a load detector that detects reduction of an output current supplied from a connection node of the inductor and the capacitive element to a load and outputs an output current reduction signal; and a delay control circuit that generates a delay control signal a value of which gradually reduces from a time when the output current reduction detection signal is generated, wherein the delay circuit changes a delay time of the delay inversion signal in accordance with the value of the delay control signal.