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Power conversion device

A power conversion device and capacitor technology, which is applied to output power conversion devices, emergency protection circuit devices, electrical components, etc., can solve problems such as overcurrent and overvoltage, and achieve the effect of a simple structure

Active Publication Date: 2020-06-09
TOSHIBA MITSUBISHI-ELECTRIC IND SYST CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the power conversion device described above, when any of the plurality of semiconductor switching elements is damaged and short-circuited, an overcurrent or overvoltage may occur.

Method used

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Embodiment Construction

[0028] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same reference numerals are given to the same or corresponding parts in the drawings below, and the description thereof will not be repeated in principle.

[0029] figure 1 It is a schematic block diagram showing the main circuit configuration of the power conversion device 100 according to the embodiment of the present invention. The power conversion device 100 according to the embodiment of the present invention is applied to, for example, an uninterruptible power supply device. The AC power supply 1 supplies three-phase AC power of a commercial frequency to the power conversion device 100 . The load 4 is driven by three-phase AC power of a commercial frequency supplied from the power conversion device 100 .

[0030] refer to figure 1 , The power conversion device 100 includes three converter units U1 to U3 connected in parallel between th...

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Abstract

This power conversion device is provided with a converter (2R), a first capacitor (C1R), and a second capacitor (C2R). The first capacitor (C1R) is connected between a DC positive bus line (PL1) and aDC neutral point bus line (NL1). The second capacitor (C2R) is connected between the DC neutral point bus line (NL1) and a DC negative bus line (CL1). The converter (2R) includes: diode rectifiers (D1R, D2R) that are respectively connected between an AC power supply (1) and the DC positive bus line (PL1), and between an AC power supply (1) and the DC negative bus line (NL1); and first AC switches(D3R to D6R, Q1R) that are electrically connected between the AC power supply (1) and the DC neutral point bus line (CL1). The power conversion device is further provided with a first fuse (FR) thatis electrically connected between the first AC switches (D3R to D6R, Q1R) and a connection point between the first and the second capacitors.

Description

technical field [0001] The present invention relates to power conversion devices. Background technique [0002] A power conversion device applied to an uninterruptible power supply device generally includes a converter for converting AC power from a commercial AC power supply into DC power, and an inverter for converting the DC power into AC power of a desired frequency and voltage. [0003] For example, International Publication No. 2010 / 095241 (Patent Document 1) discloses an uninterruptible power supply device including a power conversion device including a 3-level converter and a 3-level inverter. In this power conversion device, each of the 3-level converter and the 3-level inverter includes a plurality of semiconductor switching elements. [0004] In the power conversion device described above, when any one of the plurality of semiconductor switching elements is damaged and enters a short-circuit state, an overcurrent or an overvoltage may be generated. Therefore, in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/12H02M7/48H02M7/487
CPCH02M7/487H02M1/32H02M5/4585H02M7/21H02M7/12H02M7/48H02M7/217H02M7/537H02H7/1216
Inventor 西村一辉中野俊秀
Owner TOSHIBA MITSUBISHI-ELECTRIC IND SYST CORP
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