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

A voltage equalizing protection circuit for series igbt

A technology of voltage protection and circuits, applied in the field of voltage equalization protection circuits, to achieve the effects of wide range, suppression of overvoltage effects, and convenient adjustment

Active Publication Date: 2019-09-06
HUAZHONG UNIV OF SCI & TECH
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the defects of the prior art, the purpose of the present invention is to provide a voltage equalization protection circuit for series connection of IGBTs, aiming to solve the problem of voltage leveling and overvoltage protection of IGBTs in series operation in the prior art

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
  • A voltage equalizing protection circuit for series igbt
  • A voltage equalizing protection circuit for series igbt
  • A voltage equalizing protection circuit for series igbt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] image 3 It is a schematic diagram of a voltage equalization protection circuit made by applying this principle. The circuit includes a static voltage equalization resistor, a drive circuit 1 and a control circuit 2; the drive circuit 1 includes a voltage acquisition module U1, a comparison module U2, a first optical fiber transceiver module, and a drive module U3 . A grid resistance control module; the control circuit 2 includes a second optical fiber transceiver module and a control module U6.

[0057] Figure 4 It is the circuit diagram of this embodiment, the series IGBT Q1 connected in the voltage equalization protection is FZ800R33KF2C; its rated voltage is 3300V, rated current is 800A, blocking resistance is 660KΩ, the actual working voltage is 1250V, and the set peak voltage is 1500V ;

[0058] The static voltage equalizing resistor is connected in parallel with the series IGBT Q1. The static voltage equalizing resistor includes a series voltage equalizing res...

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 voltage-sharing protection circuit for the series connection of an IGBT, and the circuit comprises a voltage collection module, an i-th comparator, a control module and a grid electrode resistor module, wherein I is one integer from 1 to N, and N is a natural number. An i-th output end of the voltage collection module is connected with the i-th comparator, and the first output end of the i-th comparator is connected with an i-th input end of the grid electrode resistor module. The second output end of the first comparator is connected with the input end of the control module, and the output end of the control module is connected with the (N+1)-th input end of the grid electrode resistor module. The output end of the grid electrode resistor module serves as the output end of the voltage-sharing protection circuit. According to the invention, the circuit obtains a square wave signal through a set threshold value according to a voltage signal of a collector electrode, so as to change the size of the grid resistance. The circuit can adjust the rising speed of the voltage of the collector electrode, reduces the peak voltage, inhibits the overvoltage impact caused by the difference of stray parameters of a signal transmission line, and can avoid the overvoltage loss risks of the series connection of the IGBT at a current cut-off stage and in the whole working period.

Description

technical field [0001] The invention belongs to the field of power electronics, and more specifically relates to a voltage equalization protection circuit for series-connected IGBTs. Background technique [0002] A solid-state power electronic switch composed of an insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, IGBT) has the characteristics of fast switching speed, strong controllability, and long life. Used in series to achieve a higher voltage level, this solution has good effect and low cost, so it has been widely concerned and applied. [0003] When the IGBTs are used in series, due to the subtle differences between the various semiconductor devices and the influence of the parasitic inductance of the line, the pressure on each device will be unbalanced during the switching process, which will greatly affect the service life and working efficiency of the switch, and even Cause device breakdown damage. Ensuring the balanced voltage distribution of...

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 Patents(China)
IPC IPC(8): H03K17/567
Inventor 张明王栋煜
Owner HUAZHONG UNIV OF SCI & TECH
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