Circuit for driving a relay used in an AC circuit, with a protec

Details Circuit for driving a relay used in an AC circuit, with a protec Circuit for driving a relay used in an AC circuit, with a protec

1987-06-16

1988-09-06

Hix, L. T.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

307137, H01H 4712

Patent

active

047697377

ABSTRACT:
A circuit for driving a relay having at least two contacts and an excitation coil. An AC power source is connected to the contacts of the relay for applying a voltage of a prescribed frequency to these contacts. A detector section compares a pulse current, induced in phase with the AC current supplied from the AC power source, with a reference value, thereby producing a detection signal. In accordance with this detection signal, the positive and negative phases of a signal having a cycle longer than, and being asychronous with, said AC current, are delayed alternately or at random, thereby generating a timing control signal. This timing control signal closes and opens said relay at random timings, thereby protecting the relay from contact welding.

REFERENCES:
patent: 4153922 (1979-05-01), Azuma et al.

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