Title:
LOAD DRIVE DEVICE
Document Type and Number:
Japanese Patent JP2023159670
Kind Code:
A
Abstract:
To provide a load drive device which can detect an abnormality of a reverse connection protection relay provided on a ground line.SOLUTION: An inverter (power converter) 60 is provided between a power supply line Lp and a ground line Lg connected with a battery 15 and converts DC power of the battery 15 to be supplied to a motor (load) 80. A control circuit 301 controls an operation of the inverter 60. A reverse connection protection relay 52 is provided on the ground line Lg and blocks current flowing to the power supply line Lp via the inverter 60 from the ground line Lg when the battery 15 is reversely connected in OFF. The reverse connection protection relay 52 is constituted of a transistor having a parasitic diode for conducting current from a source to a drain. The control circuit 301 detects an abnormality of the reverse connection protection relay 52 on the basis of monitor voltage Vm equivalent to voltage drop from the source to the drain of the reverse connection protection relay 52 and voltage drop VF of the parasitic diode.SELECTED DRAWING: Figure 1
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Inventors:
KAWASAKI HIROKAZU
Application Number:
JP2022069517A
Publication Date:
November 01, 2023
Filing Date:
April 20, 2022
Export Citation:
Assignee:
DENSO CORP
International Classes:
H02M7/48
Attorney, Agent or Firm:
Patent Attorney Corporation Hattori International Patent Office