| 摘要 |
PURPOSE:To provide a luminance regulating circuit for back-up lamp in which cost reduction is realized by reducing the number of components while suppressing EMI noise. CONSTITUTION:The luminance regulating circuit for back-up lamp comprises a resonance inverter 12 for converting output voltage of a battery 10 into AC voltage, a back-up lamp 16 to be lighted with output voltage from the resonance inverter 12, and a dimmer 14 for controlling the output voltage from the resonance inverter 12. The resoance inverter 12 comprises a variable inductor 22 connected with its LC resonance circuit 20 and the control circuit 14 controls the inductance of the variable inductor 22 thus controlling the output voltage from the resonance inverter 12 and regulating luminance of the back-up lamp 16. |
