DC-AC converter for supplying a gas and/or vapour discharge lamp

Details DC-AC converter for supplying a gas and/or vapour discharge lamp DC-AC converter for supplying a gas and/or vapour discharge lamp

1988-02-03

1989-12-12

Yusko, Donald J.

Electric lamp and discharge devices: systems

Condenser in the supply circuit

Condenser in shunt to the load device and the supply

315175, 315176, 315224, 315307, 315DIG5, 363 98, H05B 3700

Patent

active

048870072

ABSTRACT:
A DC-AC converter for supplying energy to a dishcarge lamp (17). The converter is in the form of an imcomplete half-bridge circuit (11, 12; 15, 16, 19, 18). The lamp (17) is connected in series with a coil (18) and a capacitor (16). Two switching elements (11, 12) in the half-bridge circuit are formed as semiconductor switching elements. The lamp current is a square-shaped alternating current. A diode (13) is connected in parallel with the one switching element (11) and a diode (14) is connected in parallel with the other switching element (12). The control circuit of the switching elements is provided with a switching circuit (21) which alternately switches the one switching element (11) and the other switching element (12) several times. The number of switching elements through which the lamp current flows can therefore remain limited to two.

REFERENCES:
patent: 4585974 (1986-04-01), Stupp et al.
patent: 4698554 (1987-10-01), Stupp et al.
patent: 4700113 (1987-10-01), Stupp et al.
patent: 4709188 (1987-11-01), Roberts
patent: 4717863 (1988-01-01), Zeiler
patent: 4725762 (1988-02-01), Jagschitz
patent: 4734624 (1988-03-01), Nagase et al.
patent: 4763239 (1988-08-01), Ball

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