Changeover Relay Circuit

The circuit diagram shown here is of a automatic changeover switch using ic ltc4412 from linear technologies.

Changeover relay circuit.

The supply to the ic 555 circuit should be from the battery and the supply to the changeover circuit should be from an ac dc adapter. Ups relay changeover circuit. This circuit can be used for the automatic switchover of a load between a battery and a wall adapter ltc4412 controls an external p channel mosfet to create a near ideal diode function for power switch over and load sharing. This could be used for switching over the output from ac mains to inverter mains during inappropriate voltage conditions.

The next concept makes an attempt to create a simple relay changeover circuit with zero crossing detector which may be used in inverter or ups changeover applications. The most common changeover function relays are produced to switch a single feed line usually positive position 30 between two active functions in a circuit the relay is switched manually via a toggle push switch or remotely through the circuit. In another type a ratchet relay has a ratchet mechanism that holds the contacts closed after the coil is momentarily energized. The relay may be less expensive than other types but this is partly offset by the increased costs in the external circuit.