Patent ID: 7336513

Claim:
A method of compensating capacitor voltage distortion of a half-bridge inverter, comprising steps of: (a) measuring a voltage of at least one capacitor of said half-bridge inverter and detecting an output voltage of said half-bridge inverter; (b) comparing said voltage of said at least one capacitor with said output voltage and then identifying a degree of distortion of said output voltage that results from capacitor voltage unbalance, if the degree of distortion matches a predetermined condition, indicating that said capacitor has insufficient electric energy to supply electric energy to a load without generating said degree of distortion, identifying said capacitor as a voltage-unbalanced capacitor, and then proceeding to the next step; if the degree of distortion does not match the predetermined condition, indicating that said capacitor has sufficient electric energy to provide electric energy to the load without generating said degree of distortion, and not proceeding to the next step; and (c) charging said capacitor with a compensating circuit to enable said capacitor to provide sufficient electric energy for the load without said degree of distortion.