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DC power supply units, motor drive units, air conditioners and refrigerators

A technology of DC power supply and driving device, which can be used in motor control, emergency protection circuit devices, high-efficiency power electronic conversion, etc., and can solve problems such as short-circuit damage

Active Publication Date: 2018-03-30
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the switching element fails, it generally results in short-circuit damage

Method used

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  • DC power supply units, motor drive units, air conditioners and refrigerators
  • DC power supply units, motor drive units, air conditioners and refrigerators
  • DC power supply units, motor drive units, air conditioners and refrigerators

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0054] figure 1 It is a circuit block diagram showing a configuration example of the first embodiment of the DC power supply device 100 according to the present invention. The DC power supply device 100 of this embodiment is a power conversion device that converts AC to DC, and converts the three-phase AC supplied from the AC power supply 1 into DC to supply to the load 11 . The load 11 may be any load that consumes power in direct current. Here, the load 11 is assumed to be an inverter load that drives a motor of a compressor used in equipment to which a refrigeration cycle is applied, for example. Examples of equipment to which a refrigeration cycle is applied include air conditioners, refrigerators, washing and drying machines, refrigerators, dehumidifiers, heat pump water heaters, and showcases. The load 11 is not limited to the load of equipment using a refrigeration cycle, and may also be a load of a vacuum cleaner, a fan motor or an exhaust fan, a hand dryer, inductio...

Embodiment approach 2

[0093] Figure 7 It is a circuit block diagram showing a configuration example of a motor drive device according to Embodiment 2 of the present invention. exist Figure 7 In, pair with figure 1 Components that operate in the same manner as those shown in the circuit configuration are denoted by the same reference numerals as in Embodiment 1, and redundant descriptions are omitted. Figure 7 The shown motor drive device includes the DC power supply device 100 according to the first embodiment. figure 1 A load of 11 with Figure 7 The inverter 30 corresponds to the motor 31. The inverter 30 is connected to both ends of a series circuit composed of the first capacitor 6a and the second capacitor 6b. A DC voltage is input to the inverter 30 .

[0094] The motor drive device of the present embodiment includes a current detector 32 and a drive control unit 33 in addition to the DC power supply device 100 of the first embodiment. The current detector 32 (32a, 32b) detects the ...

Embodiment approach 3

[0105] Figure 8It is a circuit block diagram showing a configuration example of an air conditioner according to Embodiment 3 of the present invention. The air conditioner of this embodiment has the motor drive device demonstrated in Embodiment 2. FIG. The air conditioner of the present embodiment has a compressor 41 incorporating the motor 31 of Embodiment 2, a four-way valve 42 , an outdoor heat exchanger 43 , an expansion valve 44 , and an indoor heat exchanger 45 assembled through refrigerant piping 46 . The refrigeration cycle constitutes a split air conditioner.

[0106] A compression mechanism 47 for compressing the refrigerant and an electric motor 31 for operating it are arranged inside the compressor 41, and the refrigerant is circulated from the compressor 41 to between the heat exchangers 43 and 45 to perform cooling, heating, etc. refrigeration cycle. Figure 8 The shown circuit block can be applied not only to an air conditioner but also to equipment having a ...

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Abstract

The present invention provides a DC power supply device, which includes: a rectifier (2), which is connected to a power supply (1); a charge storage part, which is composed of a first capacitor (6a) and a second capacitor (6b) connected in series; a switching part ( 7) consisting of a first switching element (4a) and a second switching element (4b) connected in series, and anti-backflow elements (5a, 5b) for suppressing the backflow of charges from the charge storage part; a reactor (3 ); the control unit (8), which controls the actions of the first switching element (4a) and the second switching element (4b); and the DC voltage detection unit (10), which detects the voltage across the first capacitor (6a) The voltage across the first terminal of the capacitor (6b) and the voltage across the second terminal of the second capacitor (6b), the control unit (8) detects the first terminal voltage based on the voltage difference between the first terminal voltage and the second terminal voltage. Short-circuit failure of the switching element (4a) and the second switching element (4b).

Description

technical field [0001] The present invention relates to a DC power supply unit, a motor drive unit, an air conditioner and a refrigerator. Background technique [0002] There is disclosed a technique of standardizing 200V and 400V by comparing a rectified DC voltage connected to a commercial three-phase power supply with a reference value, and then operating or stopping a first switching element and a second switching element (for example, patent document 1). In addition, the following technology is disclosed: turning on and off the first switching element and the second switching element at the same time, or turning on only the other during the period of simultaneous conduction, the period of only one conduction, and the period of simultaneous conduction. The on-period is continuous, and the energy is stored in the reactor to boost the voltage (for example, Patent Document 2). [0003] In addition, for commercial single-phase power supplies, the following technology is al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/155H02M7/06H02M1/00
CPCH02M1/32H02M3/158H02M7/2176H02P29/027H02H7/1255H02M1/325H02M1/007H02M3/1552F25B31/02H02H7/1213H02K1/02H02K1/27H02M7/06H02P6/12
Inventor 筱本洋介畠山和德神谷庄太
Owner MITSUBISHI ELECTRIC CORP
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