Method and circuit for synchronization of relay operation

Details Method and circuit for synchronization of relay operation Method and circuit for synchronization of relay operation

1993-03-23

1994-10-25

Williams, Howard L.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Arc suppression at switching point

361187, 361160, 361 7, 361 5, H05B 102

Patent

active

053594860

ABSTRACT:
A control circuit synchronizes operation of a latching relay to extend contact life. The relay is switched using an H-bridge drive circuit. The synchronization is done using a two-step delay. The first delay is provided by a phase shifter, which delays the timing signals used by a logic controller relative to a zero crossing. The second delay is provided by an adjustable timer circuit including a potentiometer. The two delays are used so that the latching relay is tripped at a selectable time coinciding with the second zero crossing after a switching command is received.

REFERENCES:
patent: 4897755 (1990-01-01), Polster et al.
patent: 4922363 (1990-05-01), Long et al.
patent: 5008516 (1991-04-01), Holling
patent: 5055962 (1991-10-01), Peterson et al.
patent: 5064998 (1991-11-01), Hollings

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