Two-wire dimmer with improved zero-cross detention
First Claim
1. A lighting control device comprising:
- a controllably conductive device configured to supply 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 during the first duration of time;
generate a fill signal during the second duration of time; and
filter the signal from the controllably conductive device during the first duration of time and the fill signal during the second duration of time;
wherein a delay associated with filtering the signal from the controllably conductive device during the first duration of time and filtering the fill signal during the second duration of time is consistent with a delay associated with filtering the AC line voltage.
1 Assignment
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Accused Products
Abstract
A two-wire lighting control device, may include a controllably conductive device, a signal generation circuit, and a filter circuit. The controllably conductive device may apply an AC line voltage to a load, being conductive for a first duration of time and non-conductive for a second duration of time within a half-cycle of the AC line voltage. The signal generation circuit may generate a non-zero-magnitude signal. And, the filter circuit may receive a signal from the controllably conductive device during the first duration of time and the non-zero-magnitude signal from the signal generation circuit during the second duration of time. The non-zero-magnitude signal may, in effect, fill-in or complement the signal from the controllably conductive device, and any delay variation as a function of the firing angle of the controllably conductive device through the filter circuit may be mitigated by the presence of the non-zero-magnitude signal.
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Citations
34 Claims
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1. A lighting control device comprising:
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a controllably conductive device configured to supply 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 during the first duration of time; generate a fill signal during the second duration of time; and filter the signal from the controllably conductive device during the first duration of time and the fill signal during the second duration of time; wherein a delay associated with filtering the signal from the controllably conductive device during the first duration of time and filtering the fill signal during the second duration of time is consistent with a delay associated with filtering the AC line voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A lighting control device comprising:
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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; combine the signal from the controllably conductive device and the sine-wave-shaped signal to produce a combined signal; and filter the combined signal by filtering 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. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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Specification