Electrical power supply apparatus

Electrical transmission or interconnection systems – Switching systems – Switch actuation

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Details

364707, 365227, H01H 4300

Patent

active

042595940

ABSTRACT:
Electrical power supply for use with apparatus which transmits a predetermined message. When an input signal is received, a source of electrical energy is connected to a power output terminal by turning a switching transistor on. A latching circuit holds the transistor on after termination of the input signal. Elements of the apparatus which are connected to the power output terminal to obtain operating power transmit the predetermined message when the electrical energy is supplied to the terminal. When the transmission is complete, the apparatus produces a termination signal to the latching circuit causing it to turn the switching transistor off and thus disconnect the source of electrical energy from the power output terminal. A delay arrangement prevents the latching circuit from responding to a termination signal for a predetermined period of time after the input signal has terminated, thus preventing inadvertent disconnecting of the source of electrical energy from the power output terminal before the apparatus has had an opportunity to attain full operation.

REFERENCES:
patent: 4158230 (1979-06-01), Washizuka et al.

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