POWER-FACTOR PREREGULATORS WITH IMPROVED DYNAMIC-RESPONSE

An improved control strategy of standard power factor preregulators (P FP's) is proposed, which allows fast output voltage response while mai ntaining a high power factor. This is obtained by compensating for the intrinsic low-frequency output voltage ripple, thus allowing a higher bandwidth of the output voltage control loop. This method does not re quire additional sensing, but only a multiplier and simple analog circ uitry, and it works well with a universal input voltage range. Experim ental tests on a boost converter with average current control confirm the validity of the approach.