Patent ID: 11871490
Assignee: ROHM CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  B  Y | IPC B  H

Claim 0:
1. A lighting control device that generates an output voltage by switching of an input voltage and that supplies a driving current based on the output voltage to a lighting unit to light the lighting unit, comprising:
a control signal generator configured to generate as a raw control signal a control signal that specifies alternately a lighting period in which to keep the lighting unit lit and a extinction period in which to keep the lighting unit extinguished;
a lighting unit current sensor configured to sense a current flowing through the lighting unit;
a control signal corrector configured to generate a corrected control signal by correcting, based on a current state signal based on a result of sensing by the lighting unit current sensor, the raw control signal in a direction in which the lighting period is extended; and
a switching controller configured to:
perform the switching of the input voltage during the lighting period specified by the corrected control signal and
suspend the switching of the input voltage during the extinction period specified by the corrected control signal,

wherein the control signal corrector is configured to generate the corrected control signal by, while keeping a start timing of the lighting period same before and after correction, correcting the raw control signal in the direction in which the lighting period is extended by a time required, after a start of the lighting period, for the current flowing through the lighting unit to reach a predetermined judgement current.