Title:
CONTROLLABLE POWER SUPPLY CIRCUIT FOR AN ILLUMINATION SYSTEM AND METHODS OF OPERATION THEREOF
Document Type and Number:
WIPO Patent Application WO2006018830
Kind Code:
A3
Abstract:
A method for reducing acoustic noise produced during use of a lamp dimmer detects whether the dimmer is a leading edge (101) or a trailing edge dimmer (102). A nominal firing time of a leading edge dimmer is determined and a post-correction applied to a voltage applied to the dimmer starting from the nominal firing time so as to build-up the voltage gradually during a predetermined post-correction time period and thereby reduce the rate of rise of the leading edge thereof. A nominal cutoff time of a trailing edge dimmer is determined and a pre-correction applied to a voltage applied to the dimmer starting from the nominal cut-off time so as to diminish the voltage gradually during a predetermined pre-correction time period and thereby reduce the rate of rise of the leading edge thereof. Other methods are disclosed for soft starting filament lamps and controlling dimmer circuits.
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Inventors:
TSINKER VICTOR (IL)
FIRTEL ALEXANDER (IL)
FIRTEL ALEXANDER (IL)
Application Number:
PCT/IL2005/000816
Publication Date:
June 01, 2006
Filing Date:
August 01, 2005
Export Citation:
Assignee:
LIGHTECH ELECTRONICS IND LTD (IL)
TSINKER VICTOR (IL)
FIRTEL ALEXANDER (IL)
TSINKER VICTOR (IL)
FIRTEL ALEXANDER (IL)
International Classes:
H05B39/04; H02M5/293; H05B39/02; H05B39/08
Foreign References:
| US20030127994A1 | 2003-07-10 | |||
| US6034790A | 2000-03-07 | |||
| US20020071299A1 | 2002-06-13 | |||
| US20030168996A1 | 2003-09-11 | |||
| US4528494A | 1985-07-09 | |||
| US5600233A | 1997-02-04 | |||
| US6246182B1 | 2001-06-12 | |||
| US5740021A | 1998-04-14 | |||
| EP1220579A2 | 2002-07-03 |
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