Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1981-12-14
1984-08-14
Shoop, William M.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
H02M 112
Patent
active
044660529
ABSTRACT:
A programmable DC-TO-AC voltage converter for converting a DC voltage signal provided across two DC voltage terminals to an AC voltage signal having predetermined characteristics. The system includes an AC voltage terminal; a first switch connected between the AC voltage terminal and one of the DC voltage terminals; a second switch connected between the AC voltage terminal and the other of the DC voltage terminals; and a bistable switching circuit coupled to the first and second switches for operating the first and second switches to alternatively connect either the one DC voltage terminal or the other DC voltage terminal to the AC voltage terminal in an alternating high frequency sequence to provide a high frequency pulsed voltage signal at the AC voltage terminal. The bistable switching circuit sequentially provides a pulse-width-modulated control signal to operate the first and second switches at a predetermined high frequency; and varies the duty cycle of the control signal pulses at a predetermined low frequency in accordance with a predetermined waveform pattern at the predetermined low frequency to thereby vary the duty cycle of the high frequency pulsed voltage signal at the AC voltage terminal in accordance with the predetermined waveform pattern at the predetermined low frequency. The system also includes a low pass filter connected to the AC voltage terminal for providing an AC voltage output signal at the predetermined low frequency and having the predetermined waveform, such as a 60 Hz sine wave.
REFERENCES:
patent: 3376490 (1968-04-01), Osugi
patent: 3649902 (1972-03-01), Dunbar
patent: 3958171 (1976-05-01), Sekino
patent: 3976932 (1976-08-01), Collins
patent: 4290108 (1981-09-01), Woehrle et al.
patent: 4348719 (1982-09-01), Hicks et al.
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