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1. (WO2016051739) LIGHT SWITCH DEVICE

Pub. No.:    WO/2016/051739    International Application No.:    PCT/JP2015/004867
Publication Date: Fri Apr 08 01:59:59 CEST 2016 International Filing Date: Sat Sep 26 01:59:59 CEST 2015
IPC: H05B 37/02
H01L 33/00
Applicants: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
パナソニックIPマネジメント株式会社
Inventors: MIZUNO, Jun
水野 純
Title: LIGHT SWITCH DEVICE
Abstract:
This light switch device comprises a DC/DC converter, a drive circuit, and a delay circuit. The drive circuit generates a feedback signal indicating whether or not a solid-state light-emitting element is being applied a voltage that is necessary for flowing a constant current in the solid-state light-emitting element, and a PWM signal indicating the period during which a current is supplied to the solid-state light-emitting element. The delay circuit delays the timing of at least one among the start and the end of the current supply period, with respect to the PWM signal. The DC/DC converter comprises a switching element, and a control circuit for performing, during the on-duty period determined by the PWM signal whereof the timing has been delayed by the delay circuit, a control whereby the switching element is caused to carry out switching according to the feedback signal generated by the drive circuit.