Patent ID: 11901849
Assignee: DENSO CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  B | IPC B  G  H

Claim 0:
1. A wiper device comprising:
a power supplying circuit including a plurality of switching elements, the power supplying circuit supplying, to a wiper motor, voltage that has been converted in accordance with switching control of the plurality of switching elements;
a thermistor detecting a temperature relating to a temperature of at least one of the switching elements among the plurality of switching elements;
a current detector detecting current flowing to any of the switching elements among the plurality of switching elements;
a rotational angle detector that detects a rotational angle of an output shaft of the wiper motor; and
a microcomputer that, in a case in which the current detected by the current detector exceeds a limit current at the temperature detected by the thermistor, carries out switching control of the switching elements such that the voltage supplied to the wiper motor decreases,
wherein, at a time when the current detected by the current detector exceeds the limit current, in a case in which a position of a wiper blade expressed by the rotational angle of the output shaft detected by the rotational angle detector is within a predetermined region from a predetermined position near a reversal position to the reversal position, the microcomputer carries out switching control of the switching elements such that the voltage supplied to the wiper motor decreases, and, in a case in which the position of the wiper blade is outside of the predetermined region, the microcomputer stops supply of voltage to the wiper motor.