Series supervision/parallel actuation device

Details Series supervision/parallel actuation device Series supervision/parallel actuation device

1978-09-15

1980-09-23

Miller, Jr., Stanley D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

169 61, 307253, 361245, 307241, H03K 1774, H02H 300

Patent

active

042245389

ABSTRACT:
An electronic switch for use in alarm circuits in which line polarity is reversed in the actuation mode such that the electrical continuity of the circuit and the loads in the circuit may be supervised in series and upon polarity reversal the loads may be actuated in parallel. A first embodiment for Class B circuits uses three diodes to steer a current flow from the positive line to the load and back again supervising each load and a field loop in series. Upon polarity reversal, the diodes steer full terminal voltage to each load in the loop. A second embodiment for Class A circuits utilizes a transistor to short out one diode so that current may flow in either direction along one line in the event of a break in that line.

REFERENCES:
patent: 3843907 (1974-10-01), Genuit et al.
patent: 3952809 (1976-04-01), Osborne

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