METHOD OF CONTROLLING AN OPERATING FREQUENCY OF AN INVERTER CIRCUIT IN AN ELECTRONIC DIMMING BALLAST

WIPO Patent Application WO/2012/024383

A3

An electronic ballast having an inverter circuit for driving a gas discharge lamp prevents allows some hard switching to occur in the inverter circuit in order to ensure adequate ballasting impedance to provide stable operation of the lamp, but not enough hard switching to generate excessive power loss in the inverter circuit. The inverter circuit comprises two switching devices that are coupled in series between a DC bus voltage and circuit common and are rendered conductive on a complementary basis, such that a high-frequency output voltage is generated at the junction of the switching devices. When the intensity of the lamp is at or near a low-end intensity, an operating frequency of the high-frequency output voltage is controlled to a low-end frequency that is low enough to ensure stable operation of the lamp and to allow some hard switching to occur in the switching devices, but high enough to prevent excessive power loss due to the hard switching in the switching devices.

CHRISTENSEN GRAHAM L (US)
MEROLA REBECCA A (US)
SHEARER THOMAS M (US)
VESKOVIC DRAGAN (US)

PCT/US2011/048063

July 05, 2012

August 17, 2011

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LUTRON ELECTRONICS CO (US)
CHRISTENSEN GRAHAM L (US)
MEROLA REBECCA A (US)
SHEARER THOMAS M (US)
VESKOVIC DRAGAN (US)

H05B41/282; H03K17/16; H05B41/285

WO2001078468A1	2001-10-18
WO2009037613A1	2009-03-26

US20070188111A1	2007-08-16
US20050184682A1	2005-08-25
US20040196077A1	2004-10-07
EP2205048A1	2010-07-07
US5872429A	1999-02-16

CONDO, Joseph R. (One Liberty Place Suite 2200,1650 Market Stree, Philadelphia Pennsylvania, US)

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