| 摘要 |
<p>Provided is a voltage control device for a lighting device in which the durability of a secondary lighting device can be increased without reducing the amount of light of a primary lighting device in a control circuit that selectively lights the primary lighting device and the secondary lighting device, which consume different amounts of power, using feedback control. When controlling the supply of power to the lighting device (114) from an AC generator (101), when an effective value computation circuit unit (120) computes an effective value from a terminal voltage of the lighting device, the effective value computation circuit unit (120) is provided with an effective value constant switching circuit (130) that computes a high effective value (an absolute value) by switching a circuit resistance value by turning a switching element (Q3) on and off, and a lighting device on detection circuit unit (140) outputs an on signal, whereby the switching element (Q3) is turned on while the secondary light device (114b) is on.</p> |
