Two-wire dimmer with improved zero-cross detention

A lighting control method, comprising:

• generating by signal generation circuitry, a fill-in voltage signal;
• receiving by combiner circuitry a phase controlled AC voltage having a first portion of each AC voltage half cycle in which an AC source voltage is present and a second portion of each AC voltage half cycle in which the AC source voltage is not present, the first portion and the second portion defined by a firing angle of the phase-controlled AC voltage;
• receiving by the combiner circuitry, the fill-in voltage signal from the signal generation circuitry;
• and
• combining by the combiner circuitry, the AC source voltage present during the first portion of each AC voltage half cycle with the fill-in voltage signal during the second portion of each AC voltage half cycle to generate a combined voltage output.

A non-transitory, machine-readable, storage device that includes instructions that, when executed by control circuitry disposed in a lighting controller, cause the control circuitry to:

• cause signal generation circuitry to generate a fill-in voltage signal;
• cause combiner circuitry to receive a phase controlled AC voltage having a first portion of each AC voltage half cycle in which an AC source voltage is present and a second portion of each AC voltage half cycle in which the AC source voltage is not present, the first portion and the second portion defined by a firing angle of the phase-controlled AC voltage;
• cause combiner circuitry to receive the fill-in voltage signal from the signal generation circuitry;
• and
• cause combiner circuitry to combine the AC source voltage present during the first portion of each AC voltage half cycle with the fill-in voltage signal during the second portion of each AC voltage half cycle to generate a combined voltage output.