Patent ID: 9220133
Filing Date: 2015-12-22
Classification: H02M,H05B

Abstract:
1. A load control device for controlling the amount of power delivered from an AC power source to an electrical load, the load control device adapted to be coupled to the AC power source through a dimmer switch, the load control device comprising: a load control circuit adapted to be coupled to the electrical load for controlling the amount of power delivered to the electrical load; a controller coupled to the load control circuit for controlling the amount of power delivered to the electrical load in response to a conduction period of a phase-control voltage received from the dimmer switch; and a controllable-load circuit coupled to the controller, the controllable-load circuit configured to conduct a controllable-load current from the AC power source through the dimmer switch, the controllable-load circuit configured to maintain the magnitude of the controllable-load circuit constant for at least a portion of each half-cycle of the AC power source; wherein the controller is configured to monitor the conduction period of the phase-control voltage and to cause the controllable-load circuit to decrease the magnitude of the controllable-load current from an initial magnitude in a first half-cycle to a decreased magnitude in a second subsequent half-cycle, such that the conduction period of the phase-control voltage when the controllable-load current has the decreased magnitude in the second half-cycle is the same as when the controllable-load current has the initial magnitude in the first half-cycle.