Patent ID: 8716957

Claim:
A circuit for powering one or more lighting devices from an output of a thyristor-switched dimmer circuit, comprising: a power converter having an input for coupling to the output of the thyristor-switched dimmer circuit and at least one output for supplying energy to the one or more lighting devices; a control circuit having an input coupled to the output of the zero-crossing predicting circuit for determining an active time period for which the power converter transfers energy from the output of the thyristor-switched dimmer circuit, wherein subsequent to the active time period, a high impedance level is presented to the output of the thyristor-switched dimmer circuit during an idle period; a zero-crossing predicting circuit for calculating a zero-cross time of a voltage of an AC power source coupled to an input of the thyristor-switched dimmer circuit; and a timer coupled to the zero-crossing predicting circuit for triggering application of a glue impedance level to the output of the thyristor-switched dimmer circuit to terminate the idle period at a time substantially equal to the zero-cross time.