Patent ID: 11919441
Assignee: ROHM CO., LTD.
Field: Transport (Mechanical engineering)
Classification: CPC B  H  Y | IPC B  H

Claim 10:
11. A lamp system comprising:
a lamp control device;
an external switch;
a lamp; and
first and second resistors,
wherein the lamp control device comprises:
a first input terminal;
a second input terminal;
an output terminal configured to be connectable to the lamp via the external switch, a driving current for the lamp being output via the output terminal;
an internal switch arranged on a first path connecting together the first input terminal and the output terminal;
a constant current circuit arranged on a second path connecting together the second input terminal and the output terminal;
a voltage monitor configured to monitor a voltage fed to the output terminal; and
a controller configured to control the internal switch based on a result of monitoring by the voltage monitor,
wherein the lamp system is operable such that an input voltage is fed to one terminal of the first resistor and to one terminal of the second resistor,
another terminal of the first resistor is connected to the first input terminal,
another terminal of the second resistor is connected to the second input terminal, and
a resistance value of the second resistor is higher than a resistance value of the first resistor.