Multiphase square wave inverter composed of thyristor and turned off by use of oscillating current

A technology of oscillating current and inverter, which is applied in the field of first-level electrical engineering, can solve the problems of high insulation resistance of motors, high cost of inverters, complex circuits, etc., and achieve the effects of reducing insulation stress, reducing losses, and simplifying circuits

Active Publication Date: 2013-10-09
蔡卓剑 +1
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  • Abstract
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  • Claims
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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 composed of thyristor and turned off by use of oscillating current
  • Multiphase square wave inverter composed of thyristor and turned off by use of oscillating current

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specific Embodiment

[0016] In the present invention, each stage of inverter includes an m-phase frequency-variable square wave voltage generator. Such as figure 2 shown. Each phase is a single-phase full bridge, including two pairs of upper and lower bridge arms. Each bridge arm consists of a thyristor and an antiparallel diode. 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.

[0017] The input terminal of each stage inverter is connected with a T-shaped circuit composed of L1, C1, Th1, and L2. Among them, L1 and C1 form a softener for the input DC pulse voltage ud to reduce the dV / dt value of the DC pulse voltage. L1 and C1 are only softening, rather than flattening the pulse wave, so L1, C1 and L2 sh...

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Abstract

The invention relates to power electronics of electrician category, and aims to provide a multiphase square wave inverter composed of a thyristor and turned off by use of oscillating current. The multiphase square wave inverter comprises an inverter which is composed of a single-phase full bridge; the multiphase square wave inverter comprises n-level respectively independent inverters, each-levelinverter is composed of m single-phase full bridges, and m and n are integers greater than or equal to 1; the input end of each-level inverter is connected with a T-shaped circuit which is composed of a first inductor, a second inductor, a first capacitor and a first thyristor; the two serial ends of the first capacitor and first thyristor are connected with a series circuit which is composed of a second capacitor and a second thyristor, and the two ends of the second thyristor is inversely parallel with a diode. The multiphase square wave inverter provided by the invention has the advantagesof overcoming the defect of the existing inverters, reducing the inverter cost, decreasing the volume, decreasing the waste, simplifying the line, and reducing the dv / dt value of a direct current pulsed voltage, thereby decreasing 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 is a multi-phase square wave inverter composed of thyristors that uses oscillating current to shut down, and 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, larg...

Claims

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Application Information

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