US 11,774,995 B2
Power measurement in a two-wire load control device
Matthew Robert Blakeley, Macugnie, PA (US); and William Zotter, Coopersburg, PA (US)
Assigned to Lutron Technology Company LLC, Coopersburg, PA (US)
Filed by Lutron Technology Company LLC, Coopersburg, PA (US)
Filed on Aug. 25, 2022, as Appl. No. 17/895,139.
Application 17/895,139 is a continuation of application No. 17/202,270, filed on Mar. 15, 2021, granted, now 11,435,773.
Application 17/202,270 is a continuation of application No. 16/832,154, filed on Mar. 27, 2020, granted, now 10,948,938, issued on Mar. 16, 2021.
Application 16/832,154 is a continuation of application No. 16/125,376, filed on Sep. 7, 2018, granted, now 10,635,125, issued on Apr. 28, 2020.
Application 16/125,376 is a continuation of application No. 14/991,133, filed on Jan. 8, 2016, granted, now 10,082,815, issued on Sep. 25, 2018.
Application 14/991,133 is a continuation of application No. 13/793,308, filed on Mar. 11, 2013, granted, now 9,250,669, issued on Feb. 2, 2016.
Claims priority of provisional application 61/700,951, filed on Sep. 14, 2012.
Prior Publication US 2023/0195153 A1, Jun. 22, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G05F 1/66 (2006.01); G06F 1/26 (2006.01); H05B 39/04 (2006.01); H05B 47/175 (2020.01); G05B 15/02 (2006.01); G05F 1/12 (2006.01); G01R 21/133 (2006.01)
CPC G05F 1/66 (2013.01) [G05B 15/02 (2013.01); G05F 1/12 (2013.01); G06F 1/26 (2013.01); H05B 39/04 (2013.01); H05B 47/175 (2020.01); G01R 21/133 (2013.01); Y02B 20/00 (2013.01)] 27 Claims
OG exemplary drawing
 
1. A two-wire device to deliver power from an AC source to an electrical load, the two-wire device comprising:
a controllably conductive device couplable in series between the AC source and the electrical load; and
control circuitry operatively coupled to the controllably conductive device, the control circuitry to:
maintain the controllably conductive device in a conductive state for a portion of an alternating current (AC) half-cycle;
maintain the controllably conductive device in a non-conductive state for a remaining portion of an AC half-cycle;
receive, from a voltage measurement circuit, a plurality of measured AC voltage values measured across the controllably conductive device, each of the plurality of AC voltage values measured at a first sampling interval for the portion of the AC half-cycle in which the controllably conductive device is non-conductive;
extrapolate a plurality of AC voltage values indicative of the AC voltage across the electrical load, each of the plurality of extrapolated AC voltage values determined at a second sampling interval for the portion of the AC half-cycle in which the controllably conductive device is conductive;
receive, from a current measurement circuit, one or more values corresponding to a current provided by the AC source to the electrical load; and
determine a value corresponding to the power delivered to the electrical load based on the plurality of extrapolated AC voltage values and the one or more measured current values.