Electric power conversion systems – Current conversion – With condition responsive means to control the output...
Patent
1978-12-08
1980-09-02
Miller, J. D.
Electric power conversion systems
Current conversion
With condition responsive means to control the output...
363124, 363138, H02P 1318
Patent
active
042209897
ABSTRACT:
A polyphase variable frequency inverter with output voltage control provides a polyphase AC output from a constant potential DC supply, and comprises a chopper circuit and an inverter circuit. The chopper circuit further comprises a silicon controlled rectifier in parallel with a reverse biased diode. The anode of the silicon controlled rectifier and the cathode of the reverse biased diode are connected to the positive terminal of the constant potential DC supply while the cathode of the silicon controlled rectifier and the anode of the reverse biased diode are connected to the respective silicon controlled rectifiers and reverse biased diodes of the inverter circuit. The inverter circuit further comprises a plurality of branches, each including a first silicon controlled rectifier in series with a second silicon controlled rectifier, each such silicon controlled rectifier having in parallel therewith a reverse biased diode. The polyphase AC output is derived from the mid-point junctions of the respective silicon controlled rectifier-reverse biased diode branches of the inverter circuit. It is a feature of a specific embodiment of the present invention that the inverter circuit exhibits a constant RMS polyphase AC output voltage to frequency slope characteristic.
REFERENCES:
patent: 3460021 (1969-08-01), Schlabach
patent: 3469169 (1969-09-01), Schlabach et al.
patent: 3502957 (1970-03-01), Fried et al.
patent: 3504266 (1970-03-01), Schlabach et al.
patent: 3538419 (1970-11-01), Seki et al.
patent: 3538420 (1970-11-01), Klein
patent: 3848176 (1974-11-01), Etter
patent: 4146921 (1979-03-01), Akamatsu
Bobis Daniel H.
Miller J. D.
Popper Norman N.
Wong Peter S.
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