The Voltage-Controlled Compensation Ramp: A Waveshaping Technique for Power Factor Correctors

This paper deals with a new control method for power factor correctors. Control is carried out by a standard IC controller for peak current-mode DC-DC converters, with only an additional compensation ramp generator and peak detector. The fact that neither an analog multiplier nor an input voltage sensor is needed to achieve quasi-sinusoidal line waveforms makes this method very attractive. The method is similar to the one-cycle control method, but can be very easily adapted for use with topologies different to the boost converter, i.e., flyback, buck-boost, single-ended primary inductance converter, Cuk, and zeta topologies. Moreover, as the line current is cycle-by-cycle controlled, the resulting input current feedback loop is extremely fast, thus allowing the use of this type of control with high-frequency lines.