Method and circuit for synchronization of relay operation.

摘要

A control circuit (17) synchronizes operation of a latching relay (K0) to extend contact life. The relay (K0) is switched using an H-bridge drive circuit (22). The synchronization is done using a two-step delay. The first delay is provided by a phase shifter (35), which delays the timing signals used by a logic controller (20) relative to a zero crossing. The second delay is provided by an adjustable timer circuit (22) including a potentiometer (UR2). The two delays are used so that the latching relay (K0) is tripped at a selectable time coinciding with the second zero crossing after a switching command is received. <IMAGE> <IMAGE> <IMAGE>