Power frequency converter

Details Power frequency converter Power frequency converter

1979-11-21

1981-10-06

Pellinen, A. D.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

323266, 323282, 363136, H02M 545, H02M 5458

Patent

active

042939046

ABSTRACT:
A power converter which provides precise waveshape regulation. An input pr waveform (three-phase or single phase power) is rectified and modulated to form a chopped waveform within an envelope defined by the rectified input waveform. The modulation is removed by passing the chopped signal through a low-pass filter. The output of the low-pass filter, which is equal to the instantaneous value of the chopped waveform envelope times the instantaneous value of the duty cycle of the chopped waveform, is converted to a complete sine wave output voltage in a power inverter. The output of the power inverter is sampled and compared with a low-power reference waveform in a differential amplifier. The output of the differential amplifier is phase compensated for the effects of the low-pass filter and applied as an error signal to a pulse-width-modulated oscillator to adjust the duty cycle of the chopped waveform so that the sine wave output voltage follows the reference waveform.

REFERENCES:
patent: 3365650 (1968-01-01), Camp et al.
patent: 3514688 (1970-05-01), Martin
patent: 4034280 (1977-07-01), Cronin et al.
patent: 4042856 (1977-08-01), Steigerwald
patent: 4054843 (1977-10-01), Hamada
patent: 4190882 (1980-02-01), Chevalier et al.

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