Two wire multiple switching system

Details Two wire multiple switching system Two wire multiple switching system

1977-06-02

1979-04-10

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

335152, H01H 4722

Patent

active

041492137

ABSTRACT:
A two wire switching system is intended for use in a hostile environment such as a nuclear reactor where temperatures are in excess of 250.degree. or 300.degree. C. and where the use of a switch with a permanent magnet component or a component intended to have remanence is not desirable. The system uses eight reed switches each having three similar windings. No magnetized components are used. The switches are normally closed in the absence of a magnetic field and are opened when a net magnetic field results from current flowing through at least one winding. A pair of conductors interconnects the windings so that each conductor connects certain windings in a series arrangement to ground, giving a unique interconnection for each switch. A control current may be caused to flow in either conductor arrangement at a value of zero or plus or minus A or 2A amperes where A amperes is at least sufficient to cause actuation of a switch when it flows through one winding. It is not essential that the value of A amperes be constant so long as the ratio of plus or minus A:A or A:2A is constant. The switching system is suitable for connecting a selected one of eight temperature sensors across another pair of conductors to provide a temperature reading from the selected temperature sensor.

REFERENCES:
patent: 3902101 (1975-08-01), Angner et al.

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