Transducer of active lowpass filter of taking feedback

A technology of low-pass filtering and frequency converter, which is applied in the field of frequency converter application and can solve problems such as hazards

Inactive Publication Date: 2005-11-16
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the harmful problem caused by the high-frequency common mode signal in th

Method used

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  • Transducer of active lowpass filter of taking feedback
  • Transducer of active lowpass filter of taking feedback
  • Transducer of active lowpass filter of taking feedback

Examples

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Embodiment Construction

[0005] combine figure 1 , figure 2 and image 3 Describe this specific embodiment, this specific embodiment is made up of three-phase rectification circuit 1, PWM inverter 2, the 5th capacitor C5, the 6th capacitor C6, feedback active low-pass filter 3, feedback active low-pass filter 3 consists of a four-winding common-mode transformer 4, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a A triode T1, a second triode T2, a first DC power supply Vs1, and a second DC power supply Vs2; the three output terminals of the industrial three-phase power supply are respectively connected to the three power supply input terminals of the three-phase rectifier circuit 1 , one output end of the three-phase rectifier circuit 1 is connected to one end of the fifth capacitor C5 and one input end of the PWM inverter 2, the other end of the fifth capacitor C5 is con...

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Abstract

The disclosed frequency converter is able to filter out common mode signal existed in voltage output from existing frequency converter. Output end of drive circuit in three phases is connected to input end of C5 and PWM inverter. C5 is connected to C6, end of negative pole of Vs1, end of positive pole of Vs2, R4 and non-homonymic end. C6 is connected to output end of drive circuit in three phases and input end of PWM inverter. Output end of the PWM inverter is connected to homonymic ends of (L21-L23) respectively. Collector of T1 is connected to end of positive pole of Vs1, and emitter of T1 is connected to homonymic end of L1 and emitter of T2 etc. the invention eliminates negative effect brought by frequency converter, and possesses advantage of IC module form.

Description

Technical field: [0001] The invention relates to the technical field of frequency converter applications, in particular to a feedback active low-pass filter used in frequency converters. Background technique: [0002] Frequency conversion speed regulation is an AC drive control technology with high benefit, good performance and wide application. As a control device for frequency conversion and speed regulation, the frequency converter has been widely used in the fields of industry, agriculture and national defense. The frequency converter has made great achievements in energy saving, improving human living environment, reducing production cost, improving product quality and industrial automation. Huge contribution, but due to the rapid development of modern power electronic devices, the power switching device has a fast turn-on or turn-off characteristic, which causes the frequency converter to generate high-frequency output voltage, which causes some serious hazards, mainly...

Claims

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Application Information

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IPC IPC(8): H02P27/04
Inventor 姜艳姝徐殿国刘宇赵洪高俊山
Owner HARBIN UNIV OF SCI & TECH
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