Patent ID: 11936319
Assignee: ALPS ALPINE CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A current control circuit for controlling a drive current supplied to an inductive load, the current control circuit being configured to perform
a first mode of controlling a duty of the drive current so as to be 100% until a current value of the drive current reaches a first target current value after a supply of the drive current is started, and
a second mode of controlling the duty of the drive current so as to be a predetermined duty below 100% until the current value of the drive current reaches a second target current value that is greater than the first target current value after the current value of the drive current reaches the first target current value wherein the current control circuit further comprising:
an on-signal output unit that outputs an on-signal at a predetermined interval,
a switch that is configured to switch on and off the supply of the drive current to the inductive load,
a holding circuit that holds the switch in an on-state once the switch is switched on,
an off-signal output unit that outputs an off-signal having a same interval as that in the on-signal and a phase difference with the on-signal, and
a first comparison unit that compares the current value of the drive current with the first target current value and outputs a first comparison output signal that activates the off-signal output from the off-signal output unit when the current value of the drive current exceeds the first target current value,
wherein the holding circuit begins holding the on-state of the switch at a timing when the on-signal is output from the on-signal output unit and releases the on-state of the switch at a timing when the off-signal is output from the off-signal output unit in conjunction with the off-signal being activated by the first comparison output signal so as to control the current value of the drive current to be a predetermined duty.