Title:
ELECTRIC VEHICLE DRIVE SYSTEM, SEMICONDUCTOR CURRENT REDUCER, AND FAILURE DETECTION METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2019/187454
Kind Code:
A1
Abstract:
A control device for an electric vehicle drive system, configured so as to: commutate an overcurrent to at least one resistance in a resistance section, by switching off a semiconductor switch element (connected in series to a circuit breaker and an inverter), if an overcurrent is detected; and to cut off the commuted and reduced current by turning off the circuit breaker. The electric vehicle drive system has: a first current detector for detecting overcurrent; and a second current detector for detecting the value of a current that flows through either a semiconductor switch element or the resistance section in a semiconductor current reducer. The control device detects that the semiconductor switch element has failed if a prescribed condition is satisfied that has been applied to a current value, said current value: being the current value obtained by at least the second current detector; and being for the current flowing through the resistance section.
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Inventors:
NARUKI WATARU (JP)
ANDO MASATO (JP)
ANDO MASATO (JP)
Application Number:
PCT/JP2018/048453
Publication Date:
October 03, 2019
Filing Date:
December 28, 2018
Export Citation:
Assignee:
HITACHI LTD (JP)
International Classes:
B60L3/04; B60L3/00; H02M7/48
Foreign References:
| JPH04322101A | 1992-11-12 | |||
| JPH0662502A | 1994-03-04 | |||
| JP2015057032A | 2015-03-23 | |||
| JP2001245401A | 2001-09-07 | |||
| JP2012217253A | 2012-11-08 | |||
| JPS63257401A | 1988-10-25 |
Attorney, Agent or Firm:
SUNNEXT INTERNATIONAL PATENT OFFICE (JP)
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