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Inverter device and refrigeration cycle device

A technology of inverters and series circuits, which is applied in the field of inverter devices and refrigeration cycle devices, and can solve the problems of increased voltage drop, larger losses, and small loss reduction effects

Active Publication Date: 2010-12-08
TOSHIBA CARRIER CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the case of driving a compressor installed in a refrigeration cycle device such as an air conditioner, the conduction characteristic is not good because the loss reduction effect at low output is small.
On the other hand, when MOSFETs are used, there is a problem that the voltage drop increases when the current is large due to the conduction path of the resistance characteristic, and the loss at the time of high load increases.

Method used

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  • Inverter device and refrigeration cycle device
  • Inverter device and refrigeration cycle device
  • Inverter device and refrigeration cycle device

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Embodiment Construction

[0024] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0025] figure 1 Among them, M is a brushless DC motor (load) used as a compressor motor of an air conditioner. It consists of a stator with three phase coils Lu, Lv, and Lw connected in star form around the neutral point C, and a stator with The rotor consists of permanent magnets. The rotor is rotated by the interaction of the magnetic field generated by the current flowing through the phase coils Lu, Lv, and Lw and the magnetic field created by the permanent magnet.

[0026] The brushless DC motor M thereby drives the compressor 20 . The compressor 20 sucks in the refrigerant, compresses it, and discharges it. A refrigeration cycle in which the refrigerant discharged from the compressor 20 passes through the condenser 21 , the pressure reducer (such as the expansion valve 22 ), and the evaporator 23 and returns to the compressor 20 is constituted. Then, the refrig...

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Abstract

An inverter device includes a switching circuit having a plurality of series circuits, each having an IGBT at the upstream side and a MOSFET at the downstream side along the voltage application direction. A connection point between the IGBT and the MOSFET in these series circuits is connected to a load. A multi-phase electric communication for turning ON / OFF the IGBT of at least one series circuit and turning ON the MOSFET of another at least one series circuit among the series circuits is successively switched.

Description

technical field [0001] The present invention relates to an inverter device and a refrigeration cycle device that output driving power for a load, such as a motor. Background technique [0002] An inverter device that outputs power for driving a load including an inductance component, such as a motor, is equipped with a switching circuit having a series circuit of two switching elements that are upstream and downstream in the voltage application direction, and these series circuits are connected to each other. The interconnection points of the respective switching elements in are connected to a load, for example, to respective phase coils of a brushless DC motor. [0003] As switching elements, IGBTs or MOSFETs are often used recently. [0004] In the case of an inverter device using an IGBT, since the voltage between both ends is constant when the IGBT is turned on, the loss at high voltage output is small, and the driving circuit is simpler than when a transistor is used f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/48H02M7/5388H02P6/08F25B1/00H02M7/5387H02P6/06
CPCH02M7/5388Y02B30/741F25B2600/021Y02B30/70
Inventor 植杉通可野田浩二远藤隆久饼川宏
Owner TOSHIBA CARRIER CORP