Diode D 1 blocks power to the relay, and the protection circuit dissipates no power. Figure 4 With reversed input voltage, the relay switch engages, interrupting power to the system, and the LED ...

Figure 3 Testing the dual-coil relay using only one function generator and a high-voltage driver The diode circuits provide an easy way to convert single-coil relay drive signals to dual-coil use.

Prevent arcing and extra power loss in a relay circuit by timing its switching at zero-crossing with a high-voltage GreenPAK IC.

This power-conditioning circuit for an automotive electronic control unit replaces bulky transient absorbers with an electronic switch, Q1, and an electromechanical relay with an RC timer circuit ...