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Multiphase square wave inverter realizing commutation by utilizing insulated gate bipolar transistors (IGBT) and consisting of thyristors

A converter transformer and inverter technology, which is applied to the irreversible DC power input into AC power output, AC power input into DC power output, and output power conversion devices, etc. The high cost of the inverter and the complexity of the circuit can reduce the insulation stress, reduce the loss and simplify the circuit.

Inactive Publication Date: 2013-12-04
汪槱生
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

All of these lead to the disadvantages of high cost, large volume, large loss, complex wiring, and high dV / dt value of the motor insulation.

Method used

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  • Multiphase square wave inverter realizing commutation by utilizing insulated gate bipolar transistors (IGBT) and consisting of thyristors
  • Multiphase square wave inverter realizing commutation by utilizing insulated gate bipolar transistors (IGBT) and consisting of thyristors
  • Multiphase square wave inverter realizing commutation by utilizing insulated gate bipolar transistors (IGBT) and consisting of thyristors

Examples

Experimental program
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specific Embodiment 1

[0017] The circuit diagram of this specific embodiment is as figure 2 shown. Each stage of inverter contains m-phase frequency-variable square wave voltage generators, and each phase is a single-phase full bridge, including two pairs of upper and lower bridge arms. Each bridge arm consists of a thyristor Th and an antiparallel diode D. Two sets of diagonal bridge arms in each single-phase full bridge work in turn at 180°, and output a 180° square wave AC voltage. The output voltage is applied to a phase independent winding of the asynchronous motor. The m-phase square wave voltage is output in each inverter, and the phases are different from each other by 360 / m degrees.

[0018] The input terminal of each stage inverter is connected with a filter circuit composed of L1, C1, L2, and C2 and commutation switches K1+, K1-. The filter circuit composed of L1, C1, L2, and C2 basically filters the input DC pulse wave. The commutation switches K1+ and K1- are always on normally, ...

specific Embodiment 2

[0023] The circuit diagram of this specific embodiment is as image 3 shown. Compared with the specific embodiment 1, the difference is that the DC power supply not only outputs the + and - terminals, but also outputs the middle terminal (ie, the neutral line), and allows a certain neutral current to flow through, and the m phase of the inverter is changed to a half bridge. Each half-bridge includes two bridge arms; each bridge arm is composed of a thyristor and an anti-parallel diode, and a secondary winding W of a converter transformer is connected in series between the upper and lower bridge arms of each half-bridge. The circuit structure is the same as that of Embodiment 1. The square wave voltage can be input to the m-phase motor winding. At this time, the independent m-phase winding of the motor is connected in a star connection, and the midpoint of the star is connected to the neutral line of the DC power supply.

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Abstract

The invention relates to electrotechnical power electronics, and aims to provide a multiphase square wave inverter realizing commutation by utilizing insulated gate bipolar transistors (IGBT) and consisting of thyristors. The multiphase square wave inverter comprises n independent stages of inverters, wherein the inverter of each stage consists of m single-phase full bridges; and m and n are both integers more than or equal to 1. The multiphase square wave inverter overcomes the shortcomings of the conventional inverter, reduces the cost, volume and loss of the conventional inverter, simplifies a circuit and can reduce a dV / dt value of DC impulse voltage, thereby reducing the insulation stress of a motor.

Description

technical field [0001] The invention belongs to the first-level discipline of electric engineering and the second-level discipline of power electronics technology. In particular, it relates to a multi-phase square-wave inverter composed of thyristors using IGBT commutation, which is used for frequency conversion and speed regulation of asynchronous motors. technical background [0002] At present, in the frequency conversion speed regulation system of DC to AC, the widely used inverters for frequency conversion and speed regulation of asynchronous motors are mostly three-phase sine wave inverters composed of fully controlled devices (IGBT, IGCT, etc.). In order to generate a sine wave, high-frequency PWM technology (pulse width modulation technology) must be used. In order to solve medium and high voltage frequency conversion speed regulation, multi-level technology or Robinson transformer should be used. All of these lead to disadvantages such as high cost, large volume, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/48H02M7/515
Inventor 汪槱生
Owner 汪槱生
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