Electric power conversion systems – Current conversion – Including an a.c.-d.c.-a.c. converter
Patent
1991-02-27
1993-10-26
Beha, Jr., William H.
Electric power conversion systems
Current conversion
Including an a.c.-d.c.-a.c. converter
310179, 322 90, 363 37, 363 41, 363 56, H02M 5458
Patent
active
052571742
ABSTRACT:
An engine-driven power generating system having a bridge circuit section in which low-frequency switching elements are driven alternately by low-frequency drive signals, and high-frequency switching elements driven by high-frequency drive signals during the ON period of the low-frequency switching elements are connected in a bridge network, and an inverter circuit section having a drive signal supply circuit for supplying low-frequency and high-frequency drive signals are each supplied to the low-frequency and high-frequency switching elements that form a pair; the a-c voltage generated by an engine-driven a-c generator is converted into d-c voltage that is in turn converted into a predetermined level of low-frequency a-c voltage; characterized in that an overcurrent detecting circuit for detecting an overcurrent flowing in the bridge circuit section at a level higher than a predetermined level, a drive-signal control circuit that outputs to a drive-signal supply circuit, when the overcurrent detecting circuit detects an overcurrent during a half-cycle of the low-frequency signal in which the low-frequency switching element is turned on, a signal which turns off at least any one of the low-frequency and high-frequency switching elements to be turned on during the half-cycle after the detection of the overcurrent, and a low-pass filter for obtaining a sine-wave waveform on an output end are provided.
REFERENCES:
patent: 4325095 (1982-04-01), Hart
patent: 4710686 (1987-12-01), Guzik
patent: 4918592 (1990-04-01), Shimizu
patent: 4973896 (1990-11-01), Shiga et al.
patent: 5021936 (1991-06-01), Nishizawa et al.
Kobiyama Hiroshi
Ogiwara Kazuyuki
Okada Keisuke
Beha Jr. William H.
Sawafuji Electric Co. Ltd.
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