Patent ID: 7723864

Claim:
An electrical circuit ( 100 ) for switching a DC voltage onto a first and at least a second load ( 130 ) by way of a first and at least a second AC control voltage, the second AC control vohage comprising a signal separate from the first AC control voltage, the electrical circuit ( 100 ) comprising: a first rectifier circuit configured to rectify the first AC control voltage; a second rectifier circuit configured to rectify the second AC control voltage; a DC-to-DC converter circuit driven by the first rectifier circuit and the second rectifier circuit, and configured to generate the DC voltage when the first or second AC control voltage is active; a first electrical switching circuit ( 120 ) coupled to the first AC control voltage and configured to couple the DC voltage onto the first load ( 130 ) when the first AC control voltage is active and to decouple the DC voltage from the load ( 130 ) when the AC control voltage is inactive; and at least a second electrical switching circuit ( 120 ) coupled to the second AC control voltage and configured to switch the DC voltage onto the at least second load ( 130 ) when the at least second AC control voltage is active.