Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Mixed-frequency wave suppression device and method for frequency mixing test

A technology of overlapping frequency and chopper circuits, which is applied in the field of overlapping frequency suppression devices, can solve the problems of resistance energy consumption, high cost, and high cost, and achieve the effects of reducing energy loss, improving efficiency, and saving investment

Active Publication Date: 2013-04-24
湖南银河电气有限公司
View PDF4 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the rapid absorption and feedback of energy by the motor during the frequency stacking test, a large-capacity capacitor is required to ensure that the DC bus voltage fluctuations are within the normal range. The cost of doing so is very huge and generally unbearable
[0007] (2) Resistance energy dissipation method
However, the structure of the inverter is complex and the cost is high. The key is that the same as the resistance energy dissipation method, it can only cut the peak and cannot fill the valley. Therefore, it cannot effectively reduce the fluctuation of the DC bus.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Mixed-frequency wave suppression device and method for frequency mixing test
  • Mixed-frequency wave suppression device and method for frequency mixing test
  • Mixed-frequency wave suppression device and method for frequency mixing test

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In order to make the voltage fluctuation on the DC bus line small during the AC asynchronous motor frequency overlapping test, and the capacity of the supporting capacitor C does not need to be large, the present invention designs a frequency overlapping wave suppression device, and its circuit principle is as follows image 3 shown. It includes a support capacitor C1 , a step-up / down chopper circuit 201 and a controller 202 .

[0038] Wherein, the support capacitor C1 is connected in parallel at both ends of the DC bus to ensure the stability of the voltage on the DC bus. The step-up / down chopper circuit 201 is connected to both ends of the supporting capacitor C1, and is used to increase or decrease the voltage on the supporting capacitor C1, that is, the voltage on the DC bus, when the voltage on the supporting capacitor C1 is too low or too high. In order to reduce the fluctuation on the DC bus, so as to protect the various components of the variable frequency powe...

Embodiment 2

[0049] The working principle of the overlapping frequency suppression device of the present invention is introduced below.

[0050] As mentioned above, the controller 202 collects the voltage across the support capacitor C1 and the energy storage capacitor C2 and the current flowing through C1, and then calculates and outputs control signals to the switching elements T1-T3.

[0051] When the DC bus voltage, that is, the voltage across the supporting capacitor C1 increases, the charging and discharging current flowing through the supporting capacitor C1 will inevitably increase, and at this time the controller 202 outputs a control signal to the control terminal 2 to turn off the second switching element T2 , so that the first switching element T1 works in the PWM state under the action of the control terminal 1 , and at this time the controller sends a PWM signal to the control terminal 1 . When the PWM signal controls the first switch element T1 to close, the DC bus voltage c...

Embodiment 3

[0056] According to the above-mentioned embodiment, the present invention also provides a kind of method that carries out frequency overlap wave suppressing under frequency overlap test, and this method is as follows Figure 4 shown.

[0057] In step S401, the voltage value and the flowing current value on the DC bus are detected. In the disclosed embodiment of the present invention, the controller 202 detects or collects the voltage across the support capacitor C1. In addition, the controller 202 also collects the current flowing through the supporting capacitor C1, so as to speed up the response speed of the controller to the overvoltage or undervoltage state of the circuit, and realize the stability of the DC bus as much as possible.

[0058] In step S402, compared with the preset first threshold and second threshold, if the voltage value is higher than the first threshold, a control signal is sent to make the circuit work in the step-down chopping state, so that the DC bu...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a mixed-frequency wave suppression device for a frequency mixing test. The device comprises a supporting capacitor which is connected in parallel with two ends of a direct current bus and is used for guaranteeing voltage stability of the direct current bus, a voltage rising or dropping chipping circuit which is connected to two ends of the supporting capacity and is used for rising or dropping voltage on the supporting capacity when the voltage on the supporting capacitor is overlow or overhigh, and a controller, wherein the input of the controller is connected to the supporting capacitor and is used for detecting the voltage on the supporting capacitor; the output of the controller is connected to the control end of the voltage rising or dropping chipping circuit; when the voltage is greater than a preset first threshold value, the controller sends a control signal to make the voltage rising or dropping chipping circuit work in a voltage dropping chopping state; and when the voltage is smaller than a preset second threshold value, the controller sends a control signal to make the voltage rising or dropping chipping circuit work in a voltage rising chopping state. By the mixed-frequency wave suppression device, fluctuation of the voltage on the direct current bus can be quickly stabilized, so that the investment of a user is saved, the energy loss is reduced, and the efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a frequency overlapping suppression device and method used in frequency overlapping experiments of AC asynchronous motors. Background technique [0002] Frequency superimposition test is a simple and economical method for thermal test of AC asynchronous motor. The principle of the overlapping frequency test is to make the AC asynchronous motor continuously switch between acceleration and deceleration under no-load conditions. During the test, try to make the synchronous speed of the AC asynchronous motor fast and sometimes slow, and the motor rotor needs more torque to overcome the inertia in order to track the synchronous speed. Therefore, the no-load current of the motor is greatly increased. By adjusting the speed and frequency of acceleration and deceleration, the no-load current of the motor can reach the size of the rated current, so as to assess the temperature ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/14
Inventor 廖仲篪
Owner 湖南银河电气有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com