Switch failure diagnosis device and electric storage apparatus
a technology for failure diagnosis and switch, which is applied in the direction of safety/protection circuits, relays, instruments, etc., can solve the problems of failure of switching elements, failure of closing failure, and element remains closed
Active Publication Date: 2014-06-26
GS YUASA INT LTD
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Benefits of technology
Enables the detection of switch failures without disrupting the current path, allowing for continuous operation during charge or power supply, reducing unnecessary signal inputs and improving diagnostic accuracy.
Problems solved by technology
Such a failure of the switching element includes a close failure in which the switching element remains closed (close state) even when an open instruction signal for opening the switching element is input.
Method used
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[0016]According to a first aspect, there is provided a switch failure diagnosis device for using in a current path between an electric device and an electric storage device, the switch failure diagnosis device including: a plurality of switches connected parallel to each other in the current path between the electric device and the electric storage device; a switch terminal voltage detector configured to output a switch terminal voltage detection signal corresponding to a voltage across the switches; and a controller configured to: select the switches at different time in sequence and input an open instruction signal to each switch at the time when the switch is selected; and determine, based on the switch terminal voltage detection signal output while the open instruction signal is given, that at least one of the switches has a failure if the detected voltage is in a failure determination range.
[0017]In the switch failure diagnosis device according to the first aspect, the voltage ...
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A switch failure diagnosis device for using in a current path between an electric device and an electric storage device includes plural switches, a switch terminal voltage detector, and a controller. The switches are connected parallel to each other in the current path. The switch terminal voltage detector outputs a switch terminal voltage detection signal. The controller is configured to: select the switches at different time in sequence and input an open instruction signal to each switch at the time when the switch is selected; and determine, based on the switch terminal voltage detection signal output while the open instruction signal is given, that at least one of the switches has a failure if the detected voltage is in a failure determination range.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority from Japanese Patent Application No. 2012-178364 filed on Aug. 10, 2012. The entire content of this priority application is incorporated herein by reference.FIELD[0002]Technologies described herein relates to determination whether failures of switches that are provided for shutting off a charge current or a discharge current exist.BACKGROUND[0003]Conventionally, there is a power supply control device including a plurality of switching elements connected parallel to each other between a battery and a load, and is configured to detect a failure of any one of the switching elements (see JP-A-2011-229216). Specifically, the power supply control device measures voltages at terminals of the switching elements on the load side while the switching elements are individually opened and while the switching elements are opened at the same time (open state). Then, the power supply control device detects a failure of ea...
Claims
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IPC IPC(8): G01R31/327
CPCG01R31/3275G01R31/006H01H47/002H02J7/00302H02J7/00306G01R19/165G01R31/327
Inventor SHIRAISHI, TAKEYUKIKAWAUCHI, TOMOHIROITAGAKI, TAKESHIINOUE, TOMOSHIGEKONISHI, DAISUKE
Owner GS YUASA INT LTD