Neutral point static clamping voltage-sharing circuit for three-level inverter

A technology of three-level frequency converter and voltage equalizing circuit, which is applied in the direction of electrical components, output power conversion devices, etc., can solve the problems of IGBTs that cannot be clamped and protected, and achieve simple and reliable circuits, prevent overvoltage breakdown damage, and reduce voltage uniform effect

Pending Publication Date: 2018-01-16
BEIJING DONGBIAO ELECTRONICS
View PDF0 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a three-level frequency converter midpoint static cl

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
  • Neutral point static clamping voltage-sharing circuit for three-level inverter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0013] The specific embodiments of the present invention are described below so that those skilled in the art can understand the present invention, but it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes Within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present invention are included in the protection list.

[0014] Such as figure 1 As shown, the middle point static clamp voltage equalizing circuit of the three-level frequency converter includes a four-transistor stack structure composed of four transistors connected in series according to the emitter-collector, wherein the connection between the first transistor and the second transistor is set as node A , the connection between the second transistor and the third transistor is...

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 neutral point static clamping voltage-sharing circuit for a three-level inverter. The neutral point static clamping voltage-sharing circuit comprises a stack structure of four transistors, wherein a node A is at the joint of the first transistor and the second transistor; a node C is at the joint of the second transistor and the third transistor and serves as a voltage output end; a node B is at the joint of the third transistor and the fourth transistor; direct-current voltage DC+ and direct-current voltage DC- are connected at two ends of the stack structure of fourtransistors respectively; a series capacitor C1 and a series capacitor C2 in parallel to the stack structure of four transistors are connected between the direct-current voltage DC+ and the direct-current voltage DC-; and a parallel circuit is connected between the node A and the node B. The voltage uniformity of the insulated gate bipolar transistors can be guaranteed at static state, overvoltage breakdown damage is prevented, the circuit is simple, reliable, stable in operation and small in occupied space, any type and specification of the insulated gate bipolar transistor of any type and specification can be protected by adjusting the resistance value of a resistor R, and the circuit has great application prospects.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a static clamp voltage equalizing circuit for a three-level frequency converter. Background technique [0002] The existing diode-clamped three-level circuit can only effectively clamp and protect two of the four IGBTs on one phase, that is, the two IGBT tubes 1 and 4 cannot protect the two IGBTs 2 and 3 , This greatly increases the probability of overvoltage damage to the two IGBTs 2 and 3, causing serious losses. Contents of the invention [0003] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a three-level frequency converter midpoint static clamp voltage equalizing circuit which solves the problem that two IGBTs of the diode-clamped three-level circuit 2 and 3 cannot be clamped and protected . [0004] In order to achieve the above-mentioned purpose of the invention, the technical scheme adopted in the present inventi...

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
IPC IPC(8): H02M1/32H02M1/088
Inventor 杨国奎卢泽旺张风雷周继华
Owner BEIJING DONGBIAO ELECTRONICS
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap