| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a lighting device capable of alleviating an output by promptly detecting abnormalities of a power source, a load, or a connection state irrespective of a load voltage. <P>SOLUTION: In the lighting device structured of a DC/DC converter for converting a DC power source into a given output needed by the load, and a control part for controlling the DC/DC converter by a detected value of the output, the control part carries out alleviation of the output (A02, A03) when it detects an abrupt change of a load state in which a change of the output gets larger than a given width in a first given time. The load is a semiconductor light source. If the DC/DC converter is controlled for an output current to be a first given current value, and either when it detects a change of output voltage per 100 [μs] to be 5 [V] or more, or when it detects a change of output current per 300 [μs] to be 0.12 [A] or more, the control part alleviates the output. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
