Shutdown control circuit for an electric power supply

Details Shutdown control circuit for an electric power supply Shutdown control circuit for an electric power supply

1986-05-16

1988-02-23

Leung, Philip H.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Voltage regulator protective circuits

361 91, 361 92, 361 93, 363 51, H02H 710

Patent

active

047274484

ABSTRACT:
A control circuit for shutting down a constant-current supply suitable for a double-end feeding power supply system for a long-haul wire telecommunication system. The shutdown control circuit includes a voltage detecting circuit, a current detecting circuit and an AND gate. The voltage and current detecting circuits provide detection signals when the constant-current supply provides an output voltage greater than a predetermined voltage value and the current at the output terminal is less than a predetermined current value. The predetermined voltage and current values are determined to correspond to a load circuit input resistance at which the supply of a current by the constant-current supply is to be shut down. Thus, the shutdown condition of the constant-current supply can be determined free from the dropping characteristic of the constant-current supply, and the withstand voltages required for the circuit components and the assemblage thereof for the constant-current supply and the electronic equipment fed by the current supply, can be reduced. The same basic concept is also applied to constant-voltage supplies connected in parallel to each other and to a load circuit.

REFERENCES:
patent: 3509448 (1970-04-01), Bland
patent: 3796919 (1974-03-01), Johnson
patent: 3992659 (1976-11-01), Ekstrom
patent: 4208691 (1980-06-01), Rogowsky
patent: 4216517 (1983-09-01), Takahashi
patent: 4352136 (1982-09-01), Erickson
patent: 4403213 (1983-09-01), Khamare

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