The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 22, 2023
Filed:
May. 10, 2019
Panasonic Intellectual Property Management Co., Ltd., Osaka, JP;
Hideyuki Kishida, Osaka, JP;
Taro Kishibe, Hyogo, JP;
Abstract
A cut-off circuit diagnostic device includes a motor control module that controls a motor, and an external safety module that is detachably attached to the motor control module. The motor control module includes: a motor drive unit that has an inverter circuit for controlling a voltage applied to the motor by pulse width modulation control and a drive circuit for driving a power element of the inverter circuit; a cut-off circuit that cuts off power supply to the drive circuit; and a first cut-off circuit diagnostic unit that has a first diagnosis pulse generator for generating a first signal to control the cut-off by the cut-off circuit and that detects whether or not the power supply to the drive circuit is cut off according to the first signal. The external safety module includes a second cut-off circuit diagnostic unit that has a second diagnosis pulse generator for generating a second signal to control the cut-off by the cut-off circuit and that detects whether or not the power supply to the drive circuit is cut off according to the second signal. The motor control module further includes a function switching unit that supplies the second signal to the cut-off circuit when the external safety module is attached to the motor control module, and supplies the first signal to the cut-off circuit when the external safety module is not attached to the motor control module.