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Pwm cycle converter

一种脉宽调制、换流器的技术，应用在交流功率输入变换为交流功率输出、无需中间转换即可转换为直流的变换设备、高效电力电子转换等方向，达到改善输入电流波形的效果

Inactive Publication Date: 2006-10-25
YASKAWA DENKI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In consideration of this problem, an object of the present invention is to provide a PWM cyclo-converter capable of easily improving the input current waveform and regenerating the energy of the buffer as a power source

Method used

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  • Pwm cycle converter
  • Pwm cycle converter
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Examples

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Embodiment Construction

[0038] The present invention is described below based on specific embodiments.

[0039] figure 1 A PWM cycloconverter, and a system structure including a PWM converter using a DC voltage source are shown in a manner to implement the invention. figure 2 A PWM cycloconverter, and a system configuration including a PWM converter using a diode rectification circuit are shown in a manner to realize the present invention. image 3 A PWM cycloconverter and a system configuration including a PWM converter using a DC voltage source constituted by a buffer circuit are shown in a manner to realize the present invention. Figure 4 A structural example of the buffer circuit is shown in a manner to realize the present invention. Figure 5 A structural example of the buffer circuit is shown in a manner to realize the present invention. Fig. 6 shows an example of a conventional system structure of a PWM cycloconverter and a conventional method of suppressing filter resonance.

[0040] cu...

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PUM

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Abstract

There is provided PWM cyclo converter capable of easily performing improvement of input current waveform and snubber energy power source regeneration. The PWM cyclo converter includes a PWM converter device connected to a DC voltage system. The PWM converter device has an output unit connected to the input filter pre-stage of the PWM cyclo converter, thereby suppressing resonance of the input filter.

Description

technical field [0001] The present invention relates to a pulse width modulation (PWM) cycloconverter in which using a PWM converter connected to an input unit of the PWM cycloconverter enables an arbitrary current waveform to be obtained so that input current distortion can be suppressed. Background technique [0002] Fig. 6 shows a system of a conventional PWM cycloconverter. In Fig. 6, 1 denotes a three-phase AC power supply, 2 denotes a three-phase AC reactor, 3 denotes a three-phase AC capacitor, 4 denotes a bidirectional switch group, 5 denotes a motor used as a load, 6 denotes a three-phase AC reactor, 7 Denotes a PWM converter for converting AC to DC, 14 denotes a smoothing capacitor as a DC voltage device, 9 denotes a detection current signal of a three-phase AC power supply, and 10 denotes a CT for detecting current, which is used to detect three-phase The current detecting device of the current of the phase AC power supply, 11 is a CT for detecting the current, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M5/27H02J3/01H02M1/34
CPCH02J3/01H02M1/34H02M5/271H02M1/342Y02B70/10Y02E40/40
Inventor 原英则姜俊求山本荣治山田健二
Owner YASKAWA DENKI KK
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