Accession Number:

ADD009086

Title:

Power Frequency Converter.

Descriptive Note:

Patent,

Corporate Author:

DEPARTMENT OF THE NAVY WASHINGTON DC

Report Date:

1981-10-06

Pagination or Media Count:

8.0

Abstract:

A power converter is described which provides precise waveshape regulation. An input power 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. Author

Subject Categories:

  • Electrical and Electronic Equipment
  • Electric Power Production and Distribution

Distribution Statement:

APPROVED FOR PUBLIC RELEASE