Wednesday, July 3, 2013

DC to AC Inverter - 500W - International Rectifier

DC to AC inverter converts DC voltage to a pure sinusoidal output voltage. This is used for UPS, solar inverters and frequency converters. This design operates without fan up to 500W.

DC to AC Inverter - 500W - International Rectifier

A full bridge topology is used to implement the DC to AC inverter. 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.

DC to AC Inverter - 500W - International Rectifier

The Key IR Power Semiconductors are
  • 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)
One of the Benefits of the H bridge topology and switching technique.

"IGBTs are driven using high voltage gate driver IC with bootstrap technique. There is no separate floating power supply required for the high side drive. Bootstrap capacitors for these drivers get refreshed every switching cycle (50 usec) when current freewheels on the low side IGBTs copackage diodes."