Analog switch lowers relay power consumption

Posted on Jun 23, 2012

The circuit lowers this dissipation after actuation by applying less than the normal 5V operating voltage. Note that the voltage required to turn a relay on the pickup voltage is greater than the pickup voltage required to keep in on the dropout voltage. The relay in Figure 1 has a 3.5V pickup voltage and a 1.5V dropout voltage.

The circuit allows the relay to operate from an intermediate supply voltage of 2.5V. Table 1 compares the relay`s power dissipation with the fixed operating voltages applied and with the circuit in Figure 1 in place. When you close S1, current flo

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