Method for setting a timer circuit and device in such a timer ci

Details Method for setting a timer circuit and device in such a timer ci Method for setting a timer circuit and device in such a timer ci

1986-10-15

1988-09-27

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Switching systems

Switch actuation

3071414, 3071418, 34030915, 3403094, 3281301, H01H 700, G08B 100, H03K 500

Patent

active

047744189

ABSTRACT:
The invention relates to a method and a device for setting a timer circuit, especially in a fuse (1b), there being used a setting unit (1a) for the transfer of setting signal to the timer circuit which is housed in the fuse (1b). For the purpose of simplifying the communication between the fuse (1b) and the fuse setting unit (1a), both as regards to avoiding previous calibration of the timer reference of the system, and as regards a reduction of the electro-mechanical contact connection between the fuse (1b) and the setting unit (1a) to a minimum, it has according to the invention been suggested that there are provided setting signals such that the time to which the timer circuit is to be set, is transferred from the setting unit (1a) to the fuse (1b) by pulse width modulation of the power supply voltage. The setting signal can then be transferred via only two contacts (K1, K2) on the surface of the fuse. The modulation can be to the fact of increasing the power supply voltage from a certain first value (V+) to a higher value (V++) and back to the first value (V+).

REFERENCES:
patent: 4035661 (1977-07-01), Carlson
patent: 4459524 (1984-07-01), Oota et al.

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