Electric power conversion systems – Current conversion – Including an a.c.-d.c.-a.c. converter
Patent
1988-01-20
1989-01-10
Wong, Peter S.
Electric power conversion systems
Current conversion
Including an a.c.-d.c.-a.c. converter
363 50, 322 1, 322 90, H02M 5458, H02H 710
Patent
active
047978007
ABSTRACT:
A power generating system for an engine generator having an engine, an AC generator driven by the engine and an inverter for reconverting a rectification output of a main output winding of the AC generator into an alternating current of arbitrary frequency according to a driving signal. An overcurrent detecting circuit detects an overcurrent state of the inverter on the basis of the result of comparison between a detected value of the current carried to the inverter and a reference value. The inverter is protected from the overcurrent state when detected by cutting off the driving signal and thus inactivating the inverter. There is an automatic reference value setting circuit for changing the reference value stepwise to thereby set an optimal reference value in accordance with the ON/OFF state of a semiconductor switching element which is turned ON/OFF on the basis of the result of comparison between a signal based on a voltage which changes in accordance with a rectification output of an auxiliary output winding of the AC generator and a signal based on a voltage obtained by stabilizing the rectification output.
REFERENCES:
patent: 3831077 (1974-08-01), Richeson, Jr.
patent: 4331994 (1982-05-01), Wirth
patent: 4521840 (1985-06-01), Hoadley
patent: 4527214 (1985-07-01), Hattori et al.
Honda Giken Kogyo Kabushiki Kaisha
Wong Peter S.
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