US 12,257,948 B2
Lamp control device
Masaaki Nakayama, Kyoto (JP)
Assigned to Rohm Co., Ltd., Kyoto (JP)
Filed by ROHM CO., LTD., Kyoto (JP)
Filed on Jan. 30, 2024, as Appl. No. 18/426,602.
Application 18/426,602 is a continuation of application No. 17/298,807, granted, now 11,919,441, previously published as PCT/JP2019/046996, filed on Dec. 2, 2019.
Claims priority of application No. 2018-234402 (JP), filed on Dec. 14, 2018; and application No. 2019-061305 (JP), filed on Mar. 27, 2019.
Prior Publication US 2024/0166131 A1, May 23, 2024
Int. Cl. B60Q 11/00 (2006.01); B60Q 1/00 (2006.01); B60Q 1/38 (2006.01); B62J 6/056 (2020.01); H05B 45/58 (2020.01)
CPC B60Q 11/005 (2013.01) [B60Q 1/0094 (2013.01); B60Q 1/382 (2013.01); B62J 6/056 (2020.02); H05B 45/58 (2020.01)] 7 Claims
OG exemplary drawing
 
1. A lamp control device comprising:
an output terminal configured to let a lamp driving current be output via it;
a comparator; and
a first setter configured to set the voltage fed to a first input terminal of the comparator to a second voltage that depends on a first voltage or to a third voltage that depends on a first current,
wherein:
the output terminal is connected to a second input terminal of the comparator,
the output terminal is configured to be connectable to the lamp via a switch,
the output terminal is configured to be connectable to a second setter including the switch,
when the first setter sets the voltage fed to the first input terminal of the comparator to the second voltage, the second setter is configured to set the voltage fed to the output terminal to a fourth voltage that depends on the first voltage and the resistance value of the switch, and
when the first setter sets the voltage fed to the first input terminal of the comparator to the third voltage, the second setter is configured to set the voltage fed to the output terminal to a fifth voltage that depends on the first current and the resistance value of the switch.