Electric lamp and discharge devices: systems – Combined load device or load device temperature modifying... – Discharge device load
Patent
1979-05-09
1981-03-24
Chatmon, Jr., Saxfield
Electric lamp and discharge devices: systems
Combined load device or load device temperature modifying...
Discharge device load
315DIG5, 315 73, 315234, 315264, H01J 744, H01J 1734, H01J 1978, H01J 2996
Patent
active
042582881
ABSTRACT:
A metal halide high-intensity discharge lamp for connection to a constant wattage-type mercury ballast including a transformer having a secondary winding having a capacitor in series circuit arrangement therewith. The lamp includes starting aid means and warm-up assistance means to ensure reliable operation. The starting aid means is a voltage doubler comprising a diode and two resistors operating in conjunction with the ballast capacitor and also including a normally closed heat-responsive switch means operative to prevent voltage stress on the diode after the lamp starts. The warm-up assistance means comprises a resistor in series circuit arrangement with the arc tube and a normally open heat-responsive switch means connected in parallel circuit arrangement with the resistor so that during lamp warm up, the resistor reduces the phase shift between the voltage of the lamp and the open circuit voltage of the ballast, thereby increasing the maximum sustaining voltage to the lamp when the lamp current is zero, to prevent the arc from extinguishing.
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patent: 3445721 (1969-05-01), Waymouth
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patent: 3900761 (1975-08-01), Freese et al.
patent: 4010398 (1977-03-01), Meuwes
patent: 4013919 (1977-03-01), Corbley
Larson Daniel A.
Michael Jacob F.
Chatmon, Jr. Saxfield
Lombard R. S.
Westinghouse Electric Corp.
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