Electric power conversion systems – Current conversion – Using semiconductor-type converter
Reexamination Certificate
2005-12-13
2010-10-26
Behm, Harry (Department: 2838)
Electric power conversion systems
Current conversion
Using semiconductor-type converter
C363S021020, C323S208000
Reexamination Certificate
active
07821801
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 iconv(t) and voltage uconv(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 THDi=10 to 40 per cent. All currents of the converter are limited naturally in all operating modes.
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Janson Kuno
Jarvik Jaan
Shklovski Jevgeni
Behm Harry
Tallinn University of Technology
Vern Maine & Associates
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