Current and frequency converter having means to reduce switching

Details Current and frequency converter having means to reduce switching Current and frequency converter having means to reduce switching

1988-09-22

1989-08-08

Beha, Jr., William H.

Electric power conversion systems

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

Current and frequency

363 54, 363160, 363163, H02M 522

Patent

active

048558877

ABSTRACT:
A power conversion apparatus comprises an inverter for converting a voltage of a DC power source into AC power having a frequency higher than the commercial frequency, a transformer, fed by the inverter, for outputting AC power, which is adjusted at a desired voltage, a frequency converter, formed by two pairs of two gate turn-off thyristors (GTOs) connected in reverse-parallel, for converting the frequency of the AC power supplied from the transformer into the commercial frequency, and an energy regenerating device having capacitors for absorbing the energy of a spike voltage occurring due to a circuit inductance upon interruption of a current of each GTO of the frequency converter and a bridge circuit, formed by GTOs and diodes connected in reverse-paralel therewith, for switching over the direction of connecting the capacitors with a secondary winding of the transformer in accordance with the polarity of a voltage of the secondary winding in such a manner that the energy stored in the capacitors is regenerated to the transformer.

REFERENCES:
patent: 4479175 (1984-10-01), Gille et al.
patent: 4607322 (1986-08-01), Henderson
patent: 4697219 (1987-09-01), Mitsuoka

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