Analysis of an Interleaved Resonant Converter for High Voltage and High Current Applications

Abstract

-This paper presents an interleaved resonant converter to reduce the voltage stress of power MOSFETs and achieve high circuit efficiency. Two half-bridge converters are connected in series at high voltage side to limit MOSFETs at V in /2 voltage stress. Flying capacitor is used between two series half-bridge converters to balance two input capacitor voltages in each switching cycle. Variable switching frequency scheme is used to control the output voltage. The resonant circuit is operated at the inductive load. Thus, the input current of the resonant circuit is lagging to the fundamental input voltage. Power MOSFETs can be turn on under zero voltage switching. Two resonant circuits are connected in parallel to reduce the current stress of transformer windings and rectifier diodes at low voltage side. Interleaved pulse-width modulation is adopted to decrease the output ripple current. Finally, experiments are presented to demonstrate the performance of the proposed converter.

Large Power Hydraulic Spring Driver with Integrated Valve and Cylinder Used in High Voltage Switch

“…Now the hydraulic spring drivers used in domestic electric power industry are almost HMB-8.7 made by ABB company. There existed evident limitations in the early products [1]. Because the accumulator is build up with three separate accumulating cylinders the acetabuliform reeds endure the deflective force; Because there exist many the seal points and oil leak is large the pressure keeping time becomes short and need to increase continually; The assembly compatibility is not sound and have no self-protection ability [2].…”