Patent ID: 9642226
Date: 2017-05-02
CPC Classifications: H05B,Y02B

Claim:
1. A power device for use in a load control device for controlling the power delivered from an AC power source to an electrical load in response to a controller, the power device comprising: a forward receiving circuit adapted to be coupled to the controller via a power wiring, such that the controller is coupled in series electrical connection between the AC power source and the power device, the forward receiving circuit operable to receive a phase-control voltage from the controller via a power wiring; a control circuit operatively coupled to the forward receiving circuit for receiving a forward digital message in response to digital information encoded in timing edges of the phase-control voltage; and a reverse transmitting circuit adapted to be coupled to the controller via the power wiring; wherein the control circuit is operatively coupled to the reverse transmitting circuit for transmitting a reverse digital message to the controller via the power wiring, the control circuit operable to control the reverse transmitting circuit to adjust a magnitude of a controller voltage generated across the controller; and wherein the control circuit is operable to transmit a bit of the reverse digital message by adjusting the magnitude of the controller voltage prior to a timing edge of the phase-control voltage during a half-cycle of the AC power source; wherein the reverse digital message comprises a number of sequential data patterns, each data pattern having a first timing edge at a predetermined reference edge time during a first half-cycle, the control circuit operable to adjust the magnitude of the controller voltage during a window time period during a second half-cycle of each data pattern to transmit the bit, the window time period beginning approximately a half-cycle time period after the predetermined reference edge time during the first half-cycle.