Patent ID: 7546473

Claim:
A two-wire load control device for control of power delivered to an electrical load from a source of AC voltage, comprising: a first controllably conductive device adapted to be operatively coupled to the source of AC voltage and to the electrical load for controlling the power delivered to the load; a microprocessor coupled to the first controllably conductive device for controlling the first controllably conductive device; and a power supply adapted to be coupled to the source of AC voltage and coupled to the microprocessor for generating a DC voltage to power the microprocessor, the power supply including an energy storage element and a second controllably conductive device for controllably storing energy in the energy storage element; wherein the microprocessor is operatively coupled to the second controllably conductive device to control the second controllably conductive device, further wherein the power supply further comprises a low impedance circuit in series electrical connection with the second controllably conductive device and a high impedance circuit in parallel electrical connection with the series combination of the low impedance circuit and the second controllably conductive device; wherein when the second controllably conductive device is non-conductive, the energy storage element is operable to receive energy through the high impedance circuit, and when the second controllably conductive device is conductive, the energy storage element is operable to receive energy through the low impedance circuit.