Method And Apparatus For Phase-Controlling A Load

摘要

A load control device may control the amount of power provided to an electrical load utilizing a phase control signal that operates in a reverse phase control mode, a center phase control mode, and a forward phase control mode. A load control device may be configured to determine that the electrical load should be operated via a phase control signal operating in a forward phase-control mode. After determining to operate the electrical load via the phase control signal in the forward phase-control mode, the load control device may provide the phase control signal in a reverse phase-control mode for a predetermined period of time to the electrical load, for example, to charge a bus capacitor of the electrical load. Subsequently, the load control device may be configured to switch the phase control signal to the forward phase-control mode and provide the phase control signal in the forward phase-control mode to the electrical load.

主权项

1. A load control device for controlling an amount of power delivered from an alternating current (AC) power source to an electrical load, the load control device comprising:
a bidirectional semiconductor switch configured to be coupled between the AC power source and the electrical load; and a controller operatively coupled to the bidirectional semiconductor switch, the controller configured to:
receive a command to turn on;control the bidirectional semiconductor switch to provide a first line cycle of a phase control signal using a reverse phase control technique to the electrical load;control the bidirectional semiconductor switch to provide a second line cycle of the phase control signal using a center phase control technique to the electrical load; andcontrol the bidirectional semiconductor switch to provide a third line cycle of the phase control signal using a forward phase control technique to the electrical load.