Patent ID: 8093746

Claim:
A system for managing a four-leg transformerless Uninterrupted Power Supply (UPS) comprising: a rectifier modulation signal generator generating rectifier modulation signals; a 3-leg inverter modulation signal generator generating inverter modulation signals; a conversion module receiving said rectifier modulation signals and said inverter modulation signals and determining compensated rectifier modulated signals and 4 leg inverter modulation signals based on at least one of a measured rectified DC voltage and a frequency of said input AC signal; a rectifier PWM signal generator receiving said compensated rectifier modulated signals generating PWM rectifier signals; a 4-leg inverter PWM signal generator receiving said 4 leg inverter modulation signals generating PWM inverter signals, and a UPS comprising: a rectifier section receiving an input AC signal and rectifying said input signal based on said Pulse Width Modulated (PWM) rectifier signals; an inverter section receiving and inverting the rectified DC signals based on said Pulse Width Modulated inverter signals.