Importance

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Abstract

A line powered supply for a wall mounted lighting load control system includes a power MOSFET in series with a load control relay and a second MOSFET in parallel with the load control relay. When the lighting load is off, the MOSFET in parallel with the load relay is selectively opened to charge a capacitor feeding a regulator used to provide control system power. When the lights are on, the capacitor provides control system power. The MOSFET in series with the load control relay is open circuited to provide AC to recharge the capacitor whenever the regulator drop out voltage is reached. The MOSFET conducts for all but a very small portion of the AC cycle so that substantially all the AC power is applied to the lighting load. A second AC to DC power converter uses similar MOSFET switching to use partial AC voltage cycles to charge a capacitor and provide low voltage DC power from higher AC voltages.

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First Claim