Electrical switching apparatus and energizing circuits therefor

Details Electrical switching apparatus and energizing circuits therefor Electrical switching apparatus and energizing circuits therefor

1978-03-07

1980-10-14

Braun, Fred L.

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Vacuum or hermetically sealed type

335112, 335151, 361400, H01H 166, H01H 5100

Patent

active

042284120

ABSTRACT:
A scanner unit on a double-sided printed circuit board has reed switches on one face and coils on the other. The copper patterns include large screening pads beneath the reed switches and the coils. These pads distribute heat evenly along the switches to minimize thermally-induced E.M.F.'s, and provide electrostatic screening. An energizing circuit for the coils provides a single, long pulse several times larger in magnitude than the minimum required for relay actuation, followed by a series of shorter pulses of the same magnitude, but having a time-average magnitude equal to the relay holding current. This avoids the need for a voltage-dropping resistor and power wastage therein.

REFERENCES:
patent: 3408602 (1968-10-01), McWhorter
patent: 3582844 (1971-06-01), Launt
patent: 3812439 (1974-05-01), Parmenter

Affiliated with

Also associated with

Rating

Electrical switching apparatus and energizing circuits therefor does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Electrical switching apparatus and energizing circuits therefor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electrical switching apparatus and energizing circuits therefor will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2103221