Electronic card connecting circuit

Details Electronic card connecting circuit Electronic card connecting circuit

1986-08-22

1987-09-22

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

235441, 235492, 361 1, H02H 908

Patent

active

046959149

ABSTRACT:
An electronic card connecting circuit comprises a first contact pin for earthing a ground terminal of an electronic card, a second contact pin for electrically contacting the ground terminal to detect the ground terminal being earthed by the first contact pin, and detection control means including an active element which detects the second contact means being connected through the ground terminal to the first contact pin and controls a power source circuit to supply power to the electronic card. With this arrangement, when the first and second contact pins are in contact with the ground terminal of the electronic card, the detection control means detects the second contact pin being earthed to produce a control signal to apply power of source to the electronic card. In this manner, before the ground terminal of the card is earthed, the power source is prevented from being connected to the electronic card.

REFERENCES:
patent: 3831119 (1974-08-01), Ambrosio
patent: 4368524 (1983-01-01), Nakamura et al.
patent: 4558309 (1985-12-01), Antonevich
patent: 4575621 (1986-03-01), Dreifus

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