Dual voltage power supply

Details Dual voltage power supply Dual voltage power supply

1992-08-31

1994-08-09

DeBoer, Todd

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

361 90, 361 18, H02H 904

Patent

active

053372050

ABSTRACT:
For use in a trip unit, a switched current shunting arrangement in a circuit interruption tripping system couples the current transformers to a relatively low voltage and it accumulates a high level of energy quickly at power-up so that the tripping solenoid can promptly be energized after the detection of a spurious fault condition. The arrangement regulates supply current from the current transformers to a trip voltage capacitor and to a supply capacitor at the input of a voltage regulation circuit. The current transformer charges the trip voltage capacitor to a first prescribed voltage level, and a current shunting circuit shunts current passing from the current transformer to the supply capacitor, such that during normal operation the supply capacitor is charged to a second prescribed voltage level, which is less than the first prescribed voltage level. In response to the trip voltage capacitor charging to the first prescribed voltage level, the supply current is allowed to flow from the current transformer to the supply capacitor and the trip voltage capacitor is isolated from the supply capacitor once the trip voltage capacitor is charged to the first prescribed voltage level. This isolates the current transformer from seeing the high voltage on the trip voltage capacitor while permitting a high level voltage to be quickly obtained on the trip voltage capacitor.

REFERENCES:
patent: 3539865 (1970-11-01), Billings
patent: 4525765 (1985-06-01), Brajder
patent: 4918562 (1990-04-01), Pulizzi et al.
patent: 4999728 (1991-03-01), Curl
patent: 4999730 (1991-03-01), Pickard
patent: 5144517 (1992-09-01), Weith

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