CONDUCTION DETECTING CIRCUIT, RECTIFYING SWITCH CONTROLLING CIRCUIT COMPRISING THE CONDUCTION DETECTING CIRCUIT, AND POWER SUPPLY FOR THE RECTIFYING SWITCH CONTROLLING CIRCUIT TO BE APPLIED

摘要

Embodiments are related to a circuit configured to detect conduction of a first body diode and a second body diode of the first and second synchronous rectification transistors. The circuit comprises: a low-pass filter configured to generate a filtered voltage by receiving a detection voltage based on a drain voltage of the first synchronous rectification transistor and low-pass filtering the received drain voltage; a first comparator configured to compare whether the filtered voltage is higher than the detection voltage; and a second comparator configured to compare whether the detection voltage is higher than the filtered voltage. A time point of ending a first synchronous rectification conduction interval of the first body diode and a time point of ending a second synchronous rectification conduction interval of the second body diode are determined in accordance with outputs from the first and second comparators.