Current sensing relay

Details Current sensing relay Current sensing relay

1982-05-24

1984-06-26

Miller, Jr., George H.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

307116, 307309, 361187, H02H 326

Patent

active

044569432

ABSTRACT:
A current sensing relay assembly is disclosed wherein current sensing devices are integrated with relay outputs on a single printed circuit assembly. By integrating the output and sensor, all additional external equipment and wiring are eliminated. The current sensors achieve a maximum current to minimum current sensing ratio exceeding 100 by sensing current flow magnetically using Hall-effect devices and appropriate amplifier circuitry. Multiple channels of current sensing are achieved without requiring individual sensitivity adjustments by utilizing common threshold references for all channels. The electronic portion of the sensor achieves immunity from power line noise and a stable sensing threshold by a combination of circuit design and layout. In the illustrated embodiment, the magnetic portion of the sensor is contained entirely in a single module that incorporates the sensing coil, magnetic circuit, Hall-effect sensor, and magnetic shield.

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