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Output current distortion compensating apparatus in inverter

An output current and distortion compensation technology, which is applied to the output power conversion device, the conversion of AC power input to DC power output, and the conversion of irreversible DC power input to AC power output, etc. It can solve current fluctuation, distortion, oscillation, etc. problem, to prevent oscillation and reduce unbalance

Inactive Publication Date: 2011-11-09
LSIS CO LTD
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Problems solved by technology

[0004] However, the conventional method has disadvantages in that the actual dead-time voltage is changed by the ON / OFF characteristic of the power switching element, and the dead-time compensation voltage generates an error in response to noise detected by the current detector, wherein, The error in turn distorts the voltage applied to the motor, causing a hunting phenomenon in which the current fluctuates significantly

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  • Output current distortion compensating apparatus in inverter
  • Output current distortion compensating apparatus in inverter
  • Output current distortion compensating apparatus in inverter

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[0017] The details shown here are by way of illustration only and for purposes of explanation of embodiments of the disclosure and are presented in order to provide what is desired to be the most useful and understandable description of the principles and general aspects of the disclosure.

[0018] In this regard, no attempt has been made to show structural details of the disclosure in greater detail than is required for a fundamental understanding of the disclosure, and the description of the drawings would suggest to those skilled in the art how many aspects of the disclosure may actually be practiced. form is obvious.

[0019] The disclosure is not limited in its application to the details of construction and the arrangement of parts set forth in the following description and illustrated in the drawings. The disclosure is capable of other embodiments and of being practiced or carried out in various ways. Also, the phraseology and terminology used herein are for the purpose...

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Abstract

An output current distortion compensating apparatus in an inverter is disclosed, the inverter including an inverter controller generating a PWM signal for controlling a PWM voltage generator, wherein the inverter controller includes a first dead time compensation voltage generator generating a compensation voltage based on an output current polarity of each phase in the inverter, and a second dead time compensation voltage generator generating a compensation voltage based on an output current waveform of each phase in the inverter, and wherein a first dead time compensation voltage outputted from the first dead time compensation voltage generator and a second dead time compensation voltage outputted from the second dead time compensation voltage generator are added to generate a final dead time compensation voltage, thereby preventing occurrence of hunting phenomenon in which a current is greatly fluctuated.

Description

technical field [0001] The present disclosure relates to an output current distortion compensation device in a frequency converter, and more particularly to an output current distortion compensation device in a frequency converter configured to prevent output current distortion in a frequency converter by generating an additional compensation voltage Current distortion, in order to deal with the distortion phenomenon of the output current caused by the error of the dead time compensation voltage. Background technique [0002] Inverters for motor driving can be used for various purposes. Examples of frequency converters used to drive electric motors may include industrial manufacturing facilities, building air conditioners, and elevators. A conventional three-phase inverter receives power of three phases (R, S, T) to output a three-phase output to a motor: U phase, V phase and W phase, among which two such as IGBT (Insulated Gate Bipolar Transistor) Switching elements (divi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P27/08H02M7/48
CPCH02M7/5387H02M1/12H02M7/48H02P27/04
Inventor 金光渊
Owner LSIS CO LTD
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