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Cascade multiple inverter device

A technology of inverter and single-phase inverter, which is applied in the direction of output power conversion device, conversion of AC power input to DC power output, electrical components, etc., to achieve the effect of shortening the transmission time

Active Publication Date: 2013-04-17
FUJI ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The prior art example of this series-connected multi-inverter device is mainly introduced in areas where there is no sudden change in loads such as fans and pumps, and the regenerative function is not necessary.

Method used

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Embodiment Construction

[0047] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the following embodiments, although various limitations are made to constituent elements, types, combinations, positions, shapes, quantities, relative arrangements, etc., these are merely examples, and this The invention is not limited thereto.

[0048] figure 1It is a block diagram showing a single-phase inverter unit and its control circuit applicable to the series-connected multi-inverter device according to the present invention.

[0049] In the figure, symbol 1 is a single-phase inverter unit. The single-phase inverter unit 1 constitutes the above-mentioned Figure 7 The single-phase inverter units U1'~U6', V1'~V6' and W1'~W6' of the Figure 8 quite.

[0050] The single-phase inverter unit 1 includes a rectification unit 2 that converts three-phase alternating current into direct current, a capacitor 3 that smoothes the DC power output from the re...

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Abstract

The invention relates to a cascade multiple inverter device capable of shortening data transmission time between a detection part detecting systematic voltage and controlling and capable of modifying delay time and phase difference. Rectifying parts (2) of single-phase inverter units (1) realize 120-degree circulation control. The cascade multiple inverter device includes a main control device (5) and an auxiliary control device (8). The main control device is provided with a systematic voltage detecting part (6) connected with AC input terminals of the rectifying part of the single-phase inverter units and a systematic voltage phase synchronous judging part (7) and generates synchronous signal that is synchronous with systematic voltage. The auxiliary control device transmits the synchronous signals generated by the main control device and generate 120-degree circulation width signal that is synchronous with the systematic voltage according to the transmitted synchronous signal for controlling the switching of the rectifying part of the single-phase inverter units.

Description

technical field [0001] The present invention relates to a serial multiple inverter device (serial multiple inverter device) in which a plurality of single-phase inverter units are connected in series, and in particular to a serial multiple inverter device capable of regenerative control. Background technique [0002] Generally, in the case of directly receiving high-voltage power such as 3.3kV, 6.6kV, and 10kV to control an AC motor, a series-connected multiple inverter device is used. This prior art example of the series-connected multi-inverter device is mainly introduced in a field where there is no sudden load change such as a fan or a pump, and a regenerative function is not necessary. However, in recent years, it has been required to add a regenerative function to the series-connected multi-inverter device in response to expectations such as the expansion of applications of high-voltage motors. [0003] In response to this requirement, a method for synchronizing the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5387H02P27/06
Inventor 田重田稔久泷泽将光安部峻史
Owner FUJI ELECTRIC CO LTD