| 摘要 |
PURPOSE: To adjust electric power consumed by a discharge lamp in a wide range by simple constitution and a low price component. CONSTITUTION: F is an AC-DC converter. One output terminal is connected to an input terminal 12 of a lamp operation circuit and the other output terminal is connected to an input terminal 13. The input terminals 12, 13 and switching elements 6, 7 form a branch A. The branch A forms a DC-AC converter together with capacitors 4, 11. A coil 5, lamp connection terminals K1 , K2 , and a capacitor 39 constitute a load branch B. The blanch A is connected to between the connection terminals K1 , K2 . A driving circuit E is constituted with coils 19, 45, a transformer 41, zener diodes 26, 27, 29, 30, 42, capacitors 44, 22, resistors 23, 24, 28, a variable resistance 42, a switching element 22, and diodes 10, 22a. A branch D is formed by a series circuit of the coil 19 and a capacitor 20. The coil 45 and the variable resistance 42 form a branch C.
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