AC-DC converter

Details AC-DC converter AC-DC converter

1995-01-26

1997-03-25

Krishnan, Aditya

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

H02M 3335

Patent

active

056150989

ABSTRACT:
An AC-DC converter which allows an input current of an input AC power source to have harmonic currents of reduced levels and which supplies a stabilized output DC voltage to a load is realized by a simple circuit configuration. The converter has: a converter circuit consisting of a choke coil which receives a rectified voltage from a rectifying circuit, a switch element, and a diode; a smoothing capacitor which smooths the output voltage of the converter circuit and supplies the smoothed voltage to a load; and a control circuit consisting of a current detection circuit, a voltage detection circuit, and a pulse-width control circuit. In order to stabilize the output voltage, the switch element is turned on and off so that the peak value of the input current of the converter circuit is limited in a DC-like manner, thereby allowing the input current to have a trapezoidal waveform.

REFERENCES:
patent: 4209826 (1980-06-01), Priegnitz
patent: 5297014 (1994-03-01), Saito et al.
patent: 5515261 (1996-05-01), Bogdan
J. Spangler et al., "A comparison Between Hysteretic and Fixed Frequency Boost Converters Used For Power Factor Correction", IEEE Proceedings of the Annual Applied Power Electronics Conference and Exposition, 281-286, (Mar. 1993).
European Search Report dated Aug. 4, 1995.

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