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Duty factor probing of a triac-based dimmer
US8941316B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8941316-B2 |
| Application number | US-201113287257-A |
| Country | US |
| Kind code | B2 |
| Filing date | Nov 2, 2011 |
| Priority date | Aug 17, 2010 |
| Publication date | Jan 27, 2015 |
| Grant date | Jan 27, 2015 |
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Abstract
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A power supply circuit for operating high-efficiency lighting devices from a thyristor-controlled dimmer determines the dimming value, i.e., the dimmer duty factor by periodically probing the dimmer output. A minimum conductance is applied across the output of the dimmer during probing intervals that begin at the turn-on time of the dimmer and last until enough information has been gathered to correctly predict a next zero crossing of the AC line voltage that supplies the input of the dimmer. The dimming value is determined from the time interval between the predicted zero-crossing and a next turn-on time of the dimmer. The probing can be performed at intervals of an odd number of half-cycles of the AC line frequency so that a DC offset is not introduced within internal timing circuits of the dimmer. The AC line frequency can also be determined from a time interval between the predicted zero crossings.
First claim
Opening claim text (preview).
What is claimed is: 1. A method of determining a dimming control value of a thyristor-switched dimmer, the method comprising: predicting zero-crossings of a voltage of an AC power source that supplies power to the thyristor-switched dimmer; probing the output of the thyristor-switched dimmer by periodically or intermittently applying a minimum conductance across the output of the thyristor-switched dimmer from a turn-on time of the thyristor-switched dimmer circuit at least unti…
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Classifications
- G01R23/02Primary
Physics · mapped topic
Electricity · mapped topic
- H05B33/0815Primary
Electricity · mapped topic
Cross-Sectional Technologies · mapped topic
- H05B45/10Primary
Electricity · mapped topic
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- What does patent US8941316B2 cover?
- A power supply circuit for operating high-efficiency lighting devices from a thyristor-controlled dimmer determines the dimming value, i.e., the dimmer duty factor by periodically probing the dimmer output. A minimum conductance is applied across the output of the dimmer during probing intervals that begin at the turn-on time of the dimmer and last until enough information has been gathered to …
- Who is the assignee on this patent?
- King Eric, Melanson John L, Cirrus Logic Inc
- What technology area does this patent fall under?
- Primary CPC classification G01R23/02. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Jan 27 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).