US Patent No. 10,602,593

TWO-WIRE DIMMER WITH IMPROVED ZERO-CROSS DETECTION


Patent No. 10,602,593
Issue Date March 24, 2020
Title Two-wire Dimmer With Improved Zero-cross Detection
Inventorship William Zotter, Coopersburg, PA (US)
Bingrui Yang, Cupertino, CA (US)
Henry Kite, Cambridge (GB)
Assignee Lutron Technology Company LLC, Coopersburg, PA (US)

Claim of US Patent No. 10,602,593

1. A lighting control device comprising:a controllably conductive device for supplying an AC line voltage to a load in response to a drive signal, wherein the controllably conductive device is non-conductive for a first duration of time and is conductive for a second duration of time, wherein the first duration of time and the second duration of time are within the same half-cycle of the AC line voltage;
a control circuit configured to:
receive a signal from the controllably conductive device that represents a voltage developed across the controllably conductive device during the first duration of time;
generate a sine-wave-shaped signal that complements the voltage developed across the controllably conductive device during the second duration of time; and
filter the signal from the controllably conductive device during the first duration of time and the sine-wave-shaped signal during the second duration of time.