Patent Number: 7,821,801

Title: Power factor correction method for AC/DC converters and corresponding converter

Abstract: An indirect and passive method for AC/DC converter power factor correction is disclosed. The correction is achieved by stabilizing the input impedance of the converter with keeping the inversely proportional dependence between the current i.sub.conv(t) and voltage u.sub.conv(t) of the output smoothing filter (3). The necessary dependence is achieved by natural characteristics of circuit with passive components. An uncontrolled converter (6) with alternation of parallel and series resonance is used as such circuit. To increase the operating frequency of this converter, a chopper or an inverter is used. The resonant converter decreases the commutation current of the switches. Output voltage is easy to control by pulse width modulation of chopper or inverter. Passive power factor correction results in the total harmonic distortion of main current THD.sub.i=10 to 40 per cent. All currents of the converter are limited naturally in all operating modes.

Inventors: Janson; Kuno (Tallinn, EE), Jarvik; Jaan (Tallinn, EE), Shklovski; Jevgeni (Tallinn, EE)

Assignee: Tallinn University of Technology

International Classification: H02M 7/06 (20060101)

Expiration Date: 2018-10-26 0:00:00