Control device and method of synchronous rectifier of phase-shifted full-bridge converter

摘要

The present invention measures a basic data value for controlling a synchronous rectifier from a phase shift type full bridge converter, calculates a control interval value based on the measured basic data value, and calculates a phase shift type based on the calculated control interval value. It is possible to determine whether the bridge converter operates in a continuous conduction mode (CCM) or a discontinuous conduction mode (DCM), and calculate and apply a final control signal value to the synchronous rectifier according to the determined operating region. have. Through this, the present invention has the effect of minimizing the current flowing through the body diode to reduce the secondary conduction loss generated when the phase shift type full bridge converter operates in the discontinuous region under light load conditions. In addition, the synchronous rectifier control of the phase-shift full bridge converter can increase efficiency at light load. In addition, it is possible to implement an efficient phase shift type full bridge converter by performing a mathematical calculation using data values of the phase shift type full bridge converter without additional device or circuit modification. In addition, it has the effect of efficiently using the entire system of the DC-DC converter using a phase-shift full bridge converter.