Electrical transmission or interconnection systems – Plural supply circuits or sources – Substitute or emergency source
Patent
1988-06-08
1989-05-02
Beha, Jr., William H.
Electrical transmission or interconnection systems
Plural supply circuits or sources
Substitute or emergency source
363 56, 363 97, 363134, H02J 700, H02M 7538
Patent
active
048271500
ABSTRACT:
An inverter is provided, especially for use in an uninterruptible power supply, with its switching transistors being ground referenced and its output voltage fed back and compared to a single reference waveform for a self-setting duty cycle control of the switching transistors. The switching transistors are activated only when the output voltage is outside of a predetermined error band from the desired level, with the control system activating the switching transistors to drive the output voltage to the desired level and deactivating the switching transistors when the output voltage is within the error band. A current limit circuit provides current limit control which varies depending on the angle and magnitude of the output voltage.
REFERENCES:
patent: 3733537 (1973-05-01), Kernick et al.
patent: 3859586 (1975-01-01), Wadlington
patent: 4155113 (1979-05-01), Simmons
patent: 4336587 (1982-06-01), Boettcher, Jr. et al.
patent: 4456950 (1984-06-01), Cordy
patent: 4489371 (1984-12-01), Kernick
patent: 4553039 (1985-11-01), Stifter
patent: 4692854 (1987-09-01), Baxter et al.
patent: 4706180 (1987-11-01), Wills
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