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Three-phase alternating-current power supply switching circuit

A three-phase AC and switching circuit technology, which is applied in the direction of DC power input conversion to DC power output, conversion equipment and electrical components that can be converted to DC without intermediate conversion, and can solve problems such as complex switching circuit structures and achieve suppression The effect of structural complexity

Inactive Publication Date: 2015-08-19
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the related art A, there is a problem that the structure of the switching circuit for the three-phase AC power supply capable of handling multiple types of three-phase AC power supply is complicated.

Method used

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  • Three-phase alternating-current power supply switching circuit
  • Three-phase alternating-current power supply switching circuit
  • Three-phase alternating-current power supply switching circuit

Examples

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Embodiment approach 1

[0029] figure 1 It is a figure which shows the structure of the switching circuit 100 for three-phase AC power supply concerning Embodiment 1 of this invention. refer to figure 1 , the switching circuit 100 for a three-phase AC power supply is electrically connected to the input terminal portion 8 . Hereinafter, the meaning of "the constituent element A and the constituent element B are electrically connected" may be expressed as "the constituent element A and the constituent element B are connected" by omitting the description of "electrically".

[0030] The input terminal unit 8 is connected to a three-phase AC power supply (not shown). This three-phase AC power supply constitutes an R phase, an S phase, and a T phase of a three-phase AC. The R phase, the S phase, and the T phase are respectively AC. In addition, when the type of the three-phase AC power supply is a three-phase four-wire system, the three-phase AC power supply also supplies the N-phase of the AC. Herein...

Embodiment approach 2

[0081] In this embodiment, a configuration using interphase voltages of the R phase, the S phase, and the T phase will be described. image 3 It is a diagram showing the configuration of a switching circuit 100A for a three-phase AC power supply according to Embodiment 2 of the present invention.

[0082] refer to image 3 100 A of switching circuits for three-phase AC power sources differ from the switching circuit 100 for three-phase AC power sources in that they further include a phase-to-phase voltage detection circuit 50 and a switch SW1 . The other configurations of the switching circuit 100A for three-phase AC power supply are the same as those of the switching circuit 100 for three-phase AC power supply, and therefore detailed description thereof will not be repeated.

[0083] The phase-to-phase voltage detection circuit 50 is a circuit that detects (detects) two different alternating-current phase-to-phase voltages among the R-phase, S-phase, and T-phase of the alter...

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Abstract

An operation circuit (25) is set to a conductive state in a case where a three-phase alternating-current power supply switching circuit (100) receives an R phase and an N phase. An internal switch (21 b) is set to a non-conductive state in a case where the state of the operation circuit (25) is the conductive state. One contactor (20) electrically connects an input terminal (8bN) to output terminals (91, 92, 93) in a case where the state of the operation circuit (25) is the conductive state. Another contactor (10) electrically disconnects input terminals (8aR, 8aS, 8aT) from the output terminals (91, 92, 93) in a case where the state of the internal switch (21b) is the non-conductive state.

Description

technical field [0001] The present invention relates to a switching circuit for a three-phase AC power supply capable of handling multiple types of three-phase AC power supplies. Background technique [0002] There are various technologies that utilize three-phase AC power. Patent Document 1 discloses a technology (hereinafter, referred to as related technology A) as an example of using a three-phase AC power supply. In Related Art A, three power conversion units are used. In addition, in Related Art A, the three-phase AC power supply is star-connected to each power conversion unit when the input voltage is high, and the three-phase AC power supply is connected to each power conversion unit when the input voltage is low. Delta connection (delta connection) way to switch control. Accordingly, the withstand voltage of each element of the downstream circuit is ensured against a wide range of input voltages. [0003] Furthermore, in related art A, a thyristor is used as a sw...

Claims

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Application Information

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IPC IPC(8): H02M5/04
CPCH02M5/02H02M1/10H02M5/04H02M3/158
Inventor 长谷川公司
Owner MITSUBISHI ELECTRIC CORP
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