A control circuit is configured to compare an input voltage measured through an input voltage detection circuit with a first threshold which is lower than a rated voltage of an external DC power supply and with a second threshold which is lower than the first threshold. The control circuit is configured, when detecting that a duration time in which the input voltage is kept lower than the first threshold reaches a predetermined holding period, to stop operating a switching device. The control circuit is configured, after detecting that the input voltage is lower than the second threshold, to more shorten a maximum ON time than that during a normal operation or lengthen an OFF time of the switching device than a maximum OFF time during the normal operation.
Power supply, head light device using the power supply, and vehicle using the headlight device
2016-06-21
Patent
Electronic Resource
English
IPC: | B60Q ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL , Anordnung von Signal- oder Beleuchtungsvorrichtungen, deren Einbau oder Halterung oder deren Schaltkreise bei Fahrzeugen allgemein / H02M APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS , Anlagen zur Umformung von Wechselstrom in Wechselstrom, von Wechselstrom in Gleichstrom oder umgekehrt, oder von Gleichstrom in Gleichstrom und zur Verwendung in Netzen oder ähnlichen Stromversorgungssystemen / H05B ELECTRIC HEATING , Elektrische Heizung |
POWER SUPPLY DEVICE, HEADLIGHT DEVICE USING POWER SUPPLY DEVICE AND VEHICLE USING HEADLIGHT DEVICE
European Patent Office | 2015
|POWER SUPPLY, HEAD LIGHT DEVICE USING THE POWER SUPPPLY, AND VEHICLE USING THE HEADLIGHT DEVICE
European Patent Office | 2015
|VEHICLE HEADLIGHT AND LIGHT DISTRIBUTION CONTROL DEVICE OF VEHICLE HEADLIGHT
European Patent Office | 2019
|