Browse Prior Art Database

Differential Control of a Reed Switch

IP.com Disclosure Number: IPCOM000096028D
Original Publication Date: 1964-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 23K

Publishing Venue

IBM

Related People

Koranye, TD: AUTHOR

Abstract

One winding B of a reed switch R is connected to DC power supply P which is to be monitored. Second winding A is connected to an AC source which of itself is not of sufficient value to close the switch. In this manner, switch R closes momentarily on alternate half-cycles as the DC source voltage reaches a predetermined value. If the voltage continues to rise, the switch closes and stays closed.

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Differential Control of a Reed Switch

One winding B of a reed switch R is connected to DC power supply P which is to be monitored. Second winding A is connected to an AC source which of itself is not of sufficient value to close the switch. In this manner, switch R closes momentarily on alternate half-cycles as the DC source voltage reaches a predetermined value. If the voltage continues to rise, the switch closes and stays closed.

This effect can be utilized to first operate an alarm device D from pulsating DC from the battery as the contacts flutter. Secondly, the effect can then be used to operate circuit breaker latch relay L. This occurs when the source voltage rises to a value where switch R stays closed and a steady DC is applied to relay L, capacitor C bypassing the pulsating DC.

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