Patent ID: 11952972
Assignee: DENSO CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC F  H  Y | IPC F

Claim 0:
1. A booster that is mounted on a vehicle having an idle stop function, configured to boost an input voltage supplied from a battery and output the input voltage, which is boosted, to an in-vehicle device, the booster comprising:
a booster circuit that is a chopper-type, and includes a reactor having one end connected to the battery and a switching element connected between an other end of the reactor and a ground;
an output voltage sensor configured to detect an output voltage of the booster circuit;
a booster circuit control unit configured to control an operation of the switching element such that the output voltage of the booster circuit becomes a target voltage; and
a failure detection unit configured to determine that the switching element is in an open failure when the output voltage is less than a predetermined failure detection threshold value in an initial check of the booster, wherein
at least in a region where the input voltage is higher than a predetermined critical value, a target voltage in the initial check is set higher than a target voltage in a normal control that is an operation other than the initial check.