LAMP FAILURE DETECTING DEVICE, METHOD FOR SETTING LAMP FAILURE DETECTING DEVICE, LIGHT SOURCE FAILURE DETECTING DEVICE, METHOD FOR SETTING LIGHT SOURCE FAILURE DETECTING DEVICE, AND LAMP ASSEMBLY

• Main Authors: Hara, Yonosuke, Nakamura, Takaaki
• Format: Patent
• Language: English
• Published: 04.06.2020
• Subjects: ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING ORSUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES INGENERAL; ELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; PERFORMING OPERATIONS; TRANSPORTING; VEHICLES IN GENERAL

Each of a low beam lamp and a high beam lamp connected in series includes at least one light source. A lamp driving circuit is configured to supply current to each of the n lamps. A first voltage detecting circuit is configured to detect a first voltage that is a sum of voltages applied to each of the low beam lamp and the high beam lamp. A second voltage detecting circuit is configured to detect a second voltage that is applied to the high beam lamp. A processor is configured to obtain a difference between the first voltage and the second voltage, and to detect a failure in the low beam lamp based on comparison between the difference and a rewritable normal operation voltage of the low beam lamp.