| 摘要 |
To eliminate the effect of high-frequency distortion on the power supply side in filament lamp lighting devices that perform light adjustment of multiple filament lamps. In a filament lamp lighting device that has an alternating current power supply connected to the input side and lights multiple filament lamps by controlling its output power, inLamp lighting control circuits 2-1 through 2-n are established to respond to multiple filament lamps 4-1 through 4-n. When their switching elements are ON, these lighting control circuits 2-1 through 2-n supply input current to the filament lamps 4-1 through 4n; when the switching element is OFF, current continuous to flow to the filament lamp by means of energy stored in an inductance L. Subsequent alternation of the ON and OFF states supplies the filament lamp with output current with roughly the same shape as the input current waveform.Moreover the controller 3, by varying the duty cycle of the ON/OFF signals of the switching elements, varies the peak values of the output current and also provides the lighting control circuits 2-1 through 2-n with ON/OFF signals having staggered timing.
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