LOW POWER CONSUMPTION AC LOAD SWITCHES

摘要

A circuit for ensuring ultra-low power relay switching to control an AC load and extend a battery's lifetime. A control circuit may be designed to work where power is provides at very low duty cycle in that the on-time of applied voltage is quite short compared to its off-time. During the on-time, power such as that from a battery may be consumed to drive the circuit but overall such consumption of power is almost miniscule, for instance, a few microamperes or less from a three volt battery. An input FET may drive a pair switching FETs that provide pulses to a transformer which provides a ramp of voltage that remains above zero volts to a pair of AC switch FETs. An output of the AC switch may go to operate relays of a wire saver for operating one or more thermostats.

主权项

1. A mechanism for low power consumption load switches, comprising:
a switch having an input terminal for a low duty cycle signal having a duty cycle of less than ten percent, and having an output terminal for connection to a voltage supply; a dual switch having a first input terminal connected to the output terminal of the single switch, a second input terminal connected to the input terminal of the single switch, and having first and second output terminals, respectively; a transformer having a first end of a primary winding connected to the second output terminal of the dual switch, a second end of the primary winding connected to the first output terminal of the dual switch, and having a first end and a second end of a secondary winding; and an AC switch having a first terminal connected to the first end of the secondary winding of the transformer, a second terminal connected to the second end of the secondary winding of the transformer, and having third and fourth terminals.