DC to AC Inverter IGBT Demo Board - irf（DC AC逆变IGBT演示板irf）.pdf

Energy Saving Products Energy Saving Products DC to AC Inverter IGBT Demo Board Devices: IRGB4062DPBF (600V/24A Trench IGBT) High Side IGBTs IRG4BC20SD-PBF (600V/10A S-type Planar IGBT) Low Side IGBTs IRS2106S (600V half bridge driver IC) The purpose of a DC to AC inverter is to convert DC voltage to a pure sinusoidal output voltage in applications such as UPS, solar inverter and frequency converter. This demo board is designed to operate without fan up to 500W. 200V DC Supply 20V DC 120V/ Supply 500W Load Figure 1. Connection diagram. Equipment required: 200V, 3A DC power supply 20V, 100 mA DC power supply 120V/500W load bank such as resistors, light bulbs or a portable heater Connection should be made according to the diagram shown on Figure 1. Theory of operation: A full bridge topology is used to implement the DC to AC inverter. During positive output half cycle, Q1 is sine pulse width modulated (sine PWM) while Q4 is kept on. During negative output half cycle, Q2 is sine pulse width modulated while Q3 is kept on. The switching frequency of the high side and low side IGBTs are 20 kHz and 60 Hz, respectively. This switching technique produces 60 Hz AC sine wave across the output capacitor C4 after inductor L1. WTC June 27, 2008 Energy Saving Products