Power-factor-corrected distortion-free constant-voltage constant-current AC power supply using variable capacitance devices

An entirely new hype of AC voltage/current regulator is proposed by the use of our original variable capacitance devices. This circuit theoretically makes no distortion of output waveform, because only linear reactance devices are utilized in the power stage. For output voltage/current control and input power-factor correction, two variable capacitance devices were employed as a linear capacitor. Two small boost-type DC-to-DC converters were used as a high-speed driver for these devices. These converters deliver no power in steady state. Input current of the proposed power supply becomes almost zero with the load shorted