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Title:
DUTY FACTOR PROBING OF A TRIAC-BASED DIMMER
Document Type and Number:
WIPO Patent Application WO/2012/061454
Kind Code:
A3
Abstract:
A power supply circuit for operating high-efficiency lighting devices from a thyristor- controlled dimmer determines the dimming value, i.e., the duty factor of the output of the dimmer by periodically probing the output of the dimmer. 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.

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Inventors:
KING ERIC (US)
MELANSON JOHN L (US)
Application Number:
PCT/US2011/058884
Publication Date:
August 23, 2012
Filing Date:
November 02, 2011
Export Citation:
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Assignee:
CIRRUS LOGIC INC (US)
International Classes:
H02M1/36; H05B44/00
Domestic Patent References:
WO2010035155A22010-04-01
Foreign References:
US20100213859A12010-08-26
US5319301A1994-06-07
US5770928A1998-06-23
US7184937B12007-02-27
US5321350A1994-06-14
US6043635A2000-03-28
Other References:
ADRIAN Z AMANCI ET AL: "Synchronization system with Zero-Crossing Peak Detection algorithm for power system applications", 2010 INTERNATIONAL POWER ELECTRONICS CONFERENCE : IPEC-SAPPORO 2010 - [ECCE ASIA] ; SAPPORO, JAPAN, IEEE, PISCATAWAY, NJ, USA, 21 June 2010 (2010-06-21), pages 2984 - 2991, XP031728898, ISBN: 978-1-4244-5394-8
Attorney, Agent or Firm:
HARRIS, Andrew, Mitchell (Attorney at Law L.L.C.,P.O.Box 799, Athens GA, US)
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