Low-voltage precharging system for high-voltage variable frequency system, and control method of low-voltage precharging system

A high-voltage frequency conversion and pre-charging technology, used in electrical components, output power conversion devices, etc., can solve the problems of high cost and large space, and achieve the effects of limiting impact, reducing space and reducing power consumption.

Active Publication Date: 2014-09-10
ZHUZHOU NAT ENG RES CENT OF CONVERTERS
View PDF4 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the cost of the high-voltage contactor (high-voltage switch) and high-voltage pre-charging resistor used in the prior art is relatively high, and the space occupied by it is relatively large. Therefore, this pre-charging scheme has become the key to restricting the effective cost control of high-voltage frequency conversion products. one of the factors

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
  • Low-voltage precharging system for high-voltage variable frequency system, and control method of low-voltage precharging system
  • Low-voltage precharging system for high-voltage variable frequency system, and control method of low-voltage precharging system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0019] figure 2 It is a schematic diagram of a low-voltage pre-charging system for a high-voltage frequency conversion system according to an embodiment of the present invention. Refer below figure 2 To describe the structure and function of the system in detail.

[0020] Such as figure 2 As shown, the low-voltage pre-charging system mainly includes: a high-voltage power supply, a low-voltage power supply, a high-voltage switch 21 , a transformer 22 and a low-voltage pre-charging circuit 23 . The input end of the high voltage switch 21 receives a high voltage power supply, and the output end thereof is connected to the primary side of the transformer 22 . The secondary side of the transformer 22 is connected to the high-voltage frequency conversion system. ...

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 low-voltage precharging system for a high-voltage variable frequency system, and a control method of the low-voltage precharging system. The low-voltage precharging system comprises a high-voltage power supply, a high-voltage switch, a transformer, a low-voltage power supply and a low-voltage precharging circuit, wherein an input end of the high-voltage switch receives the high-voltage power supply; a primary side of the transformer is connected with an output end of the high-voltage switch; a secondary side of the transformer is connected with the high-voltage variable frequency system; an input end of the low-voltage precharging circuit receives the low-voltage power supply; an output end of the low-voltage precharging circuit is connected with a low-voltage winding of the transformer; and the low-voltage precharging circuit comprises a precharging switch, a precharging resistor connected in series with the precharging switch, a maintaining resistor connected in series with the precharging resistor, and a bypass switch connected in parallel with the maintaining resistor. Compared with a high-voltage precharging circuit, the low-voltage precharging system can greatly lower the product cost; the space volume of the system can be reduced effectively; impact of short-circuit current on a power supply system can be limited; and the power consumption of the precharging resistor can be reduced effectively.

Description

technical field [0001] The invention relates to the technical field of power electronics and high-voltage frequency conversion, in particular to a low-voltage pre-charging system used in a high-voltage frequency conversion system and a control method thereof. Background technique [0002] With the development of power electronics technology and the in-depth research on high-voltage inverter technology, high-voltage inverters are widely used in the drive systems of high-power mechanical equipment such as fans, water pumps, and compressors. [0003] There are energy storage elements such as capacitors in the high-voltage frequency conversion system. When the high-voltage switch is closed, an excitation surge current several times the rated current of the frequency conversion system will be generated. This excitation surge current will have a huge impact on the power frequency grid and the high-voltage frequency conversion system. , In serious cases, it will affect the normal s...

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): H02M1/32
Inventor 何伯钧罗仁俊黄欢邓飞邓霆彭勃肖伟钟强陈志新王世平王博王飞鹏何健明雷立熊强汪小梅王龙陈孟君李萍
Owner ZHUZHOU NAT ENG RES CENT OF CONVERTERS
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