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Patent Searching and Data


Title:
ELECTRIC WORK MACHINE
Document Type and Number:
WIPO Patent Application WO/2020/241140
Kind Code:
A1
Abstract:
This electric work machine comprises an inverter circuit, a power-supply-side switching element, a power-supply-side resistor, at least one circuit-side resistor, and a fault assessment unit. The power-supply-side switching element is provided between a DC power supply and the inverter circuit. The power-supply-side resistor is connected in parallel to the power-supply-side switching element. The circuit-side resistor is connected to the inverter circuit in a state in which, while all of a plurality of semiconductor switching elements of the inverter circuit are off, the circuit-side resistor can conduct power between the positive-electrode side and the negative-electrode side of the DC power supply in the inverter circuit. The fault assessment unit assesses, on the basis of a connection point voltage between the power-supply-side switching element and the inverter circuit, whether the switching element has short-circuited.

Inventors:
SUZUKI HITOSHI (JP)
Application Number:
PCT/JP2020/017743
Publication Date:
December 03, 2020
Filing Date:
April 24, 2020
Export Citation:
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Assignee:
MAKITA CORP (JP)
International Classes:
B25F5/00; H02P27/06
Foreign References:
JP2011135692A2011-07-07
JP2015089294A2015-05-07
JP2007060762A2007-03-08
JP2002272177A2002-09-20
JP2017163714A2017-09-14
Attorney, Agent or Firm:
NAGOYA INTERNATIONAL PATENT FIRM (JP)
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