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Title:
MOTOR DRIVE DEVICE AND REFRIGERATION CYCLE APPARATUS
Document Type and Number:
WIPO Patent Application WO/2024/089759
Kind Code:
A1
Abstract:
A motor drive device (2) comprises: a rectifier circuit (21); a capacitor (23) that smooths a rectified voltage output from the rectifier circuit (21); a three-phase inverter (27) that converts a capacitor voltage output from the capacitor (23) into a three-phase AC voltage and applies the result to a fan motor (134); and a shunt resistor (34) that detects a current flowing between the capacitor (23) and the three-phase inverter (27). If the capacitor voltage has surpassed a threshold voltage due to a regenerative voltage, which can be produced in the fan motor (134) when an outdoor fan (129) rotates due to an external force, a controlling control unit (26) implements a first control to simultaneously turn on an upper arm switching element (Tr1) and a lower arm switching element (Tr2) of at least one phase leg among the three phase legs of the three-phase inverter (27), and causes the capacitor voltage to be discharged via the shunt resistor (34).

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Inventors:
SASAKI RYOICHI (JP)
HATAKEYAMA KAZUNORI (JP)
Application Number:
PCT/JP2022/039669
Publication Date:
May 02, 2024
Filing Date:
October 25, 2022
Export Citation:
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Assignee:
MITSUBISHI ELECTRIC CORP (JP)
International Classes:
H02P27/06
Foreign References:
JP2021038916A2021-03-11
JP2014018070A2014-01-30
JP2011083123A2011-04-21
JPH07101345A1995-04-18
JP2003348856A2003-12-05
JP2012044847A2012-03-01
JP2006101685A2006-04-13
Attorney, Agent or Firm:
TAKAMURA, Jun (JP)
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