A fully digital controlled UPS using IGBT's

An uninterruptible power system (UPS) which consists of a pulse width modulation (PWM) rectifier and inverter with fully digital control is presented. The rating of the UPS is single phase 10 kVA of 200 V input and 200 V/100 V output. The power switching devices of the UPS are insulated gate bipolar transistors (IGBTs) in the PWM rectifier and inverter working at a switching frequency of 14.7 kHz. The instantaneous feedback control of input current and output voltage results in sinusoidal input current and output voltage. Full digital control is achieved in the control circuit of the rectifier and inverter.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>