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Intelligent device for voltage dip protection

A voltage drop and intelligent device technology, applied in circuit devices, protection against undervoltage or no voltage, electrical components, etc., can solve problems such as frequent connection or disconnection of AC contactors, circuit impact, etc., to reduce work Effects of load, extended start and stop times, extended range of adaptation

Inactive Publication Date: 2011-02-16
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the circuit voltage suddenly drops, the AC contactor may be frequently connected or disconnected due to unstable voltage, which will have a great impact on the circuit

Method used

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Embodiment Construction

[0014] Such as figure 1 As shown, the present invention provides an intelligent device for voltage drop protection, which includes a high-power rectification circuit D1 and a rectification circuit D2 connected in parallel to the AC mains, and is characterized in that the output power of the high-power rectification circuit D1 is one After passing through a DC step-down module R1, it is added to the coil C of the AC contactor through the first switch tube A. The coil C is provided with a clamp control circuit I for judging the state of the AC contactor. The clamp control The output terminal of the circuit I is connected with the single-chip microcomputer S through a conversion control circuit J; the other path of the output power supply of the described high-power rectifier circuit D1 is connected with a switching power supply module M through a switching tube module K, and the switching power supply module M includes Four outputs, the first output is applied to the coil circui...

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Abstract

The invention relates to an intelligent device for voltage dip protection, in particular to a voltage dip protection intelligent module adaptive to all electromagnetic type alternating current contactors. The module does not requires to change the structure of the alternating current contactors, adopts a switching power supply as well as voltage dip direct current startup, low-voltage direct-current maintenance and energy-saving and soundless operation, and has the characteristics of fault display, alarming, adjustable protection time, high generality and the like.

Description

technical field [0001] The invention relates to the field of intelligent control of equipment, in particular to an intelligent device for voltage drop protection. Background technique [0002] With the development of society and the advancement of technology, new technology industries are constantly emerging, and power users are paying more attention to power quality issues than ever before. For large iron and steel enterprises, petrochemical enterprises, chemical enterprises, etc., the economic losses caused by motor failure due to power grid quality problems have a huge impact. The power system will encounter a variety of faults during operation. Due to lightning strikes, short-circuit fault reclosing, external or internal power grid faults, and large-scale equipment startups, etc., the voltage fluctuates greatly instantaneously or the power is restored after a short-term power failure. The phenomenon of temporary voltage drop has a great impact on users, especially in i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J9/06H02H3/24
Inventor 许志红汤龙飞苏晶晶
Owner FUZHOU UNIV
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