Short-circuit protective circuit for uninterruptible power suppl

Details Short-circuit protective circuit for uninterruptible power suppl Short-circuit protective circuit for uninterruptible power suppl

1986-04-11

1988-02-16

Scott, J. R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit interruption by thermal sensing

361 93, 307 29, 307 39, 307 64, H02H 726

Patent

active

047259167

ABSTRACT:
A short-circuit protective circuit for uninterruptible power supply equipment of the type in which in a short-circuit at a branch feeder in a load part, a bypass thyristor switch is operated to connect in a moment directly to a commercial power supply and kept at ON for a short time while an inverter circuit remains operating, and consequently a short-circuit fuse attached to said branch feeder is blown due to energy from the bypass-circuit power supply, and thus power supply to the load continues.
According to the invention, in an accident of short-circuit at the load part, the load is connected temporarily to the bypass circuit, and supplied with power through both the inverter circuit and the bypass circuit to rapidly blow the fuse in a short time, and then power supply through only the inverter circuit to the load returns.

REFERENCES:
patent: 4122516 (1978-10-01), Tokunaga
Yukiyoshi Saeki, "Example of Application in Office Center", Dec. 1984, pp. 40-43.
Tadao Mizutani et al., "Power Transistorized Uninterruptible Power Supply", IEEE Transactions on Industry Applications, vol. IA-20, No. 4, Jul./Aug. 1984, pp. 961-966.

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