Electric lamp and discharge devices: systems – Pulsating or a.c. supply – With power factor control device
Patent
1991-07-30
1993-02-16
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
Pulsating or a.c. supply
With power factor control device
315291, 315DIG7, H05B 4116
Patent
active
051874113
ABSTRACT:
A method of extending discharge lamp life includes slowing electrode deterioration by powering the discharge lamp so that a lamp arc current having a reduced crest factor results, either by retrofitting an existing discharge lamp system with a waveform conditioning module, by powering the discharge lamp with a ballast producing a squarewave-type waveform, or by slowing deterioration of an emissive coating on a discharge lamp electrode by such means as preheating the electrode prior to use in order to bond the emissive coating on the electrode. A discharge lamp system includes a discharge lamp and components operatively coupled to the discharge lamp for supplying a lamp arc current to the discharge lamp that has a reduced crest factor and controlled lamp watt loading, such as a ballast configured to supply a lamp arc current with a waveform that is substantially a squarewave or an existing ballast retrofitted with waveform conditioning circuitry that causes the lamp arc current to have a reduced crest factor. A module is provided for retrofit purposes in order to tune an existing ballast and discharge lamp so that the crest factor is reduced.
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Boyd Dudley G.
Chen Nian
LaRoche Eugene R.
Myers Richard L.
Peterson Gordon L.
Systems and Service International, Inc.
Zarabian A.
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