Inverter circuit and integrated uninterruptible power supply pro

Details Inverter circuit and integrated uninterruptible power supply pro Inverter circuit and integrated uninterruptible power supply pro

1997-07-11

1999-04-20

Wong, Peter S.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 37, 363132, 363 97, 363 98, H02M 324, H02M 545

Patent

active

058962824

ABSTRACT:
An uninterruptible power supply (UPS) system comprising an inverter for converting a DC voltage into an AC voltage comprising a full-bridge circuit having four silicon controlled rectifier (SCR) switches, two pulse control circuits for generating control voltage signals to turn on alternate pairs of said switches, a time sequencing circuit, and a power switch circuit. The full bridge circuit is directly connected to a positive DC input terminal and is coupled through the power switch circuit to a negative DC input terminal. The time sequencing circuit generates a first pulse signal for controlling the first pulse control circuit and a second pulse signal for controlling the second pulse control circuit so that the first pulse signal and the second pulse signal being in phase opposition. The time sequencing circuit further generates a third pulse signal for controlling the power switch circuit. The UPS inverter does not require an iron core transformer and so is of a size and weight which are compatible for use in small type UPS systems. Without sacrificing device size or safe and reliable operation, such a UPS system can be conveniently integrated physically with any standard power supply.

REFERENCES:
patent: 4047081 (1977-09-01), Liska
patent: 4204265 (1980-05-01), McLeod
patent: 4208711 (1980-06-01), Baker
patent: 4410935 (1983-10-01), Dang
patent: 4445049 (1984-04-01), Steigerwald
patent: 4612611 (1986-09-01), Matthes et al.
patent: 4752866 (1988-06-01), Huynh et al.
patent: 4945465 (1990-07-01), Marinus et al.

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