Improved Current-Sharing Imbalance Control Model Based on Magnetic Ferrite Inductance and a Gate Drive Circuit

Abstract

The dynamic and static imbalance of parallel current sharing has held the concern of researchers in view of the variation in multiple parasitic parameters on high-frequency parallel switching mode power supply (SMPS). The joint simulations and suppression experiments on the parallel current-sharing imbalance of various parasitic parameters are investigated on the improved dual-pulse detection circuit platform to determine the method of detecting the parallel current-sharing imbalance ratio using the sum of the differential magnetic flux. An improved model of current-sharing imbalance control is presented consisting of magnetic ferrite inductance and a gate drive circuit. The main concerns are the suppression performance of drain, gate, and source parasitic inductance, gate–source capacitance, driving time and voltage, gate resistance, and delayed forward/reverse driving signals on the ratio of parallel current-sharing imbalance, respectively. The improved model effectively reduces the parallel current-sharing imbalance ratio by more than 5% and 2–4.2%, compared with using a gate drive circuit alone and using magnetic ferrite inductance solely.