Controllable four quadrant a.c. to a.c. and d.c. converter emplo

Details Controllable four quadrant a.c. to a.c. and d.c. converter emplo Controllable four quadrant a.c. to a.c. and d.c. converter emplo

1975-12-29

1978-06-20

Shoop, William M.

Electric power conversion systems

Cascaded or combined, diverse conversions in which the...

Combined phase and frequency conversion

363160, H02M 545

Patent

active

040965570

ABSTRACT:
Disclosed is a bilateral device to transform a.c. polyphase power to controllable a.c. or d.c. power, or to perform this transformation in reverse, by use of a single high frequency link comprising series resonant circuits. A cyclo-up converter transforms the incoming low frequency power to substantially higher frequencies of the order of kilohertz directly and without the interposition of a d.c. link, and thus, without the therewith associated low pass filters. The high frequency link includes series resonant circuits which facilitate the natural current commutation of electronic switching elements, such as controlled rectifiers. The energy is transformed from the high frequency link to a lower frequency output circuit via a cyclo-down converter, as well known in the art. Again, no d.c. link is used for the process. The low frequency output circuit referred to above, can operate at zero frequency and thus feed a d.c. load.

REFERENCES:
patent: 3487289 (1969-12-01), McMurray
patent: 3582756 (1972-06-01), McMurray
patent: 3678367 (1972-07-01), McMurray
patent: 3742336 (1973-06-01), Bedford
patent: 3835364 (1974-09-01), Van Rooy
patent: 3882369 (1975-05-01), McMurray
patent: 3959720 (1976-05-01), Bose et al.

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