PEREC 5.2 Voltage source inverter(Vsi) VD VD t二---1 Features e dc side is constant voltage, low impedance(voltage source, or bulk cap) t AC side voltage is square wave or quasi-square wave AC side current is determined by the load e Anti-parallel diodes are necessary to provide energy feedback path (freewheeling diodes, feedback diodes)Power Electron cs i 10 5.2 Voltage source inverter (VSI) Voltage source inverter (VSI) + - C R L U d V1 V2 V3 V4 VD 1 VD2 VD3 VD4 u o io Features Features DC side is constant volt DC side is constant voltage, low impedance (voltage age, low impedance (voltage source, or bulk cap) source, or bulk cap) AC side voltage is square wave or quasi AC side voltage is square wave or quasi -square wave. square wave. AC side current is determined by the load. AC side current is determined by the load. Anti -parallel diodes are nece parallel diodes are necessary to provide energy ssary to provide energy feedback path. feedback path. (freewheeling diodes (freewheeling diodes , feedback diodes) , feedback diodes)