Electric lamp and discharge devices: systems – With cathode or cathode heater supply circuit – Pulsating or a.c. supply to the cathode or heater circuit
Patent
1988-10-07
1990-06-26
Pascal, Robert J.
Electric lamp and discharge devices: systems
With cathode or cathode heater supply circuit
Pulsating or a.c. supply to the cathode or heater circuit
315240, 315DIG5, H05B 3700
Patent
active
049374982
ABSTRACT:
A DC/AC converter for igniting and supplying a gas discharge lamp (1) has two input terminals (C, D) intended to be connected to a DC voltage source. These input terminals are connected together by means of a series arrangement of a load circuit comprising at least the discharge lamp (1) and an induction coil (8), as well as a first semiconductor switching element (9). This load circuit being shunted by a circuit comprising a second semiconductor switching element (10). The switching elements (9, 10) are rendered alternately conductive and non conductive at a high frequency. The lamp is shunted by a third semiconductor switching element (12) which is conductive while the lamp electrodes (2, 3) are being pre-heated, whereafter the converter is rendered inoperative for a short period of time in order to ignite the lamp, which time is shorter than the time required to cool the lamp electrodes to below their emission temperature. The converter is thereafter rendered operative again.
REFERENCES:
patent: 4010399 (1977-03-01), Bessone et al.
patent: 4647820 (1987-03-01), Chermin et al.
patent: 4746841 (1988-05-01), Ogawa
patent: 4749909 (1988-06-01), Smulders
Bolhuis Pieter J.
De Bijl Adrianus M. J.
Van Meurs Johannes M.
Franzblau Bernard
Pascal Robert J.
U.S. Philips Corporation
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