A power factor correction circuit used to improve the ratio of real power to apparent power in an electric power distribution line containing a source of AC sinusoidal voltage and a load. The circuit includes a frequency and amplitude modulated boost converter forcing the input current to have the same...http://www.google.de/patents/US5146398?utm_source=gb-gplus-sharePatent US5146398 - Power factor correction device provided with a frequency and amplitude modulated boost converter
