Power factor improvement

Details Power factor improvement Power factor improvement

1989-07-25

1991-03-19

Wong, Peter S.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 72, 363124, 323222, 323272, 323285, G05F 146, H02P 1300

Patent

active

050016202

ABSTRACT:
A boost convertor power supply comprising an electronic switch controlling current through a boost inductance, a rectifier for charging a capacitor which accumulates the resulting boost charge from the boost inductance, and circuitry for repeatedly switching the electronic switch. A pulse width modulation circuit varies the relative on/off period of each cycle of switching to cause the peck switch current to follow a variable amplitude wave of shape corresponding to the input voltage applied to the boost converter and amplitude controlled by an error amplifier and multiplier thereby regulating the output voltage. A ramp signal generator provides for pulse width stability. An error correction circuit corrects for the difference between average current in the boost inductor and peak switch current to modify the pulse width modulation circuit to reduce distortion of the line current waveform.

REFERENCES:
patent: 4384321 (1983-05-01), Rippel
patent: 4677366 (1987-06-01), Wilkinson et al.
patent: 4719552 (1988-01-01), Albach et al.
patent: 4761725 (1988-08-01), Henze
patent: 4792887 (1988-12-01), Bernitz et al.

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