CN2682713Y

CN2682713Y - Surge protection assembly

Info

Publication number: CN2682713Y
Application number: CN 200420033412
Authority: CN
Inventors: 霍建华
Original assignee: CHENGDU KAIRUIDA ELECTRONICS Co Ltd
Current assignee: CHENGDU KAIRUIDA ELECTRONICS Co Ltd
Priority date: 2004-03-26
Filing date: 2004-03-26
Publication date: 2005-03-02
Anticipated expiration: 2014-03-26

Abstract

The utility model relates to a surge protection assembly, which belongs to the electron protective device for lightning protection switching over-voltage protection. The heat tripping mechanism of the surge protection assembly is composed of a voltage-sensitive resistor and an elastic electrode. One end of the elastic electrode is electrically connected with one end of the voltage-sensitive resistor through low-temperature soldering tin and the other end is connected with a a leading-out terminal III, and the other end of the voltage-sensitive resistor is connected with a leading-out terminal I. The utility model is also provided with a diode and a deterioration alarm circuit, the cathode of the diode is connected with one end of the voltage-sensitive resistor which is electrically connected with the elastic electrode, and the anode of the diode and the leading-out terminal III are used as a pair of normally-closed contacts to control the alarm circuit. The surge protection assembly has heat tripping function and deterioration alarming function, and can effectively prevent equipment from being damaged by thunder and lightning or switching over-voltage.

Description

The surge protection assembly

One, technical field

The utility model relates to a kind of overvoltage protecting device, is the Electronic Protection device that is used for lightning protection, anti-switching overvoltage specifically.

Two, background technology

Thunder and lightning or switching overvoltage often cause the badly damaged of electric equipment, cross the harm of surge formula voltage at this, also normal adopt single only irritated resistance protection device (as 40KA) as surge protection spare, dredge this paroxysmal powerful electric current.It has certain lightning protection function, still, use in the practice and find, when line voltage distribution is unusual raise and the duration longer, when having surpassed surge protection spare ability to bear, the leakage current of piezo-resistance increases, the product excessive heating finally may cause fire; Perhaps when surge protection spare deterioration (producing mouthful performance index drops in the time of can not satisfying basic demand) when thunderbolt arrives, can cause protected device damage.

Three, utility model content

The purpose of this utility model provides a kind of surge protection assembly with better lightning protection function, and it has heat and breaks away from function.This novel purpose is realized by following technical scheme: a kind of surge protection assembly, comprise piezo-resistance, it is characterized in that also having an elastic electrode, elastic electrode one end is electrically connected with piezo-resistance one end through low temperature scolding tin, and the other end is connected to leading-out terminal III; The piezo-resistance other end is connected to leading-out terminal I.

From technique scheme, under the normal condition, this product is in high-impedance state (during use, this product leading-out terminal I, III are connected in parallel between the line and line that needs protection), does not almost have circuit flow to cross (microampere order), when thunder and lightning or the arrival of other switching overvoltage, varistor with nanosecond speed conducting response (＜25ns 〉, the level that too high voltage limit can be born at equipment, with the lightning current bleed off to ground, after overvoltage was gone over, this product can revert to high-impedance state again; Longer when line voltage distribution time that raises unusually; amplitude is higher, has surpassed the ability to bear of this product, under the effect of line voltage distribution; the varistor leakage current increases; the product heating, the low temperature melts soldering tin, elastoresistance one end was disconnected with being connected of piezo-resistance one end; that is to say that leading-out terminal III breaks from power supply circuits; end the excessive heating of product, effectively protected equipment, stopped the generation of fire.

Four, description of drawings

Fig. 1 is the profile of this novel embodiment;

Fig. 2 is the upward view of Fig. 1;

Fig. 3 is the electrical schematic diagram of Fig. 1;

Fig. 4 is the electrical schematic diagram that contains the single component of warning circuit;

Fig. 5 is the electrical schematic diagram that contains a plurality of assemblies of warning circuit;

Five, embodiment

Fig. 1 Fig. 2 Fig. 3 illustrates, shell 1 is divided into two chambers by dividing plate 3, elastic electrode is arranged in the left chamber, piezo-resistance 6 is encapsulated in the right chamber, one end of piezo-resistance is electrically connected with elastic electrode 2 one ends through low temperature scolding tin 8, the piezo-resistance other end is connected to the leading-out terminal I that is installed on the shell, and the elastic electrode other end is connected to the leading-out terminal III (being external electrode 4) on the shell.The concrete practice is, two silver-plated end faces of piezo-resistance are connected to two pins respectively, wherein pin is electrically connected with exit I on the shell, remove another pin, power at the corresponding end face of this pin and to connect an interior electrode 7 (external electrode 4 relatively), interior electrode passes dividing plate and stretches in another chamber, is electrically connected with elastic electrode one end through low temperature scolding tin again, forms hot off line structure.Diode 5 negative poles are connected to an end of the piezo-resistance that is electrically connected with elastic electrode, and (also can be described as on the end face that is connected to piezo-resistance, as shown in Figure 1), diode cathode is connected to the leading-out terminal II (referring to Fig. 2) on the shell.

Among Fig. 4, extremely alert circuit is by light-emitting diode D1, D2, resistance R 1, R2 forms, and its annexation is: the positive pole of diode 5 is that leading-out terminal II is connected to the D1 negative pole, D1 positive pole, D2 positive pole, R1 one are terminated at a bit, the R1 other end is connected to leading-out terminal I, behind the D2 negative pole serial connection R2, is connected to leading-out terminal III.Fig. 4 illustrates an assembly and is connected in parallel on the line L1 that needs protection and the situation between the line L2, and promptly leading-out terminal I is connected to line L1, and leading-out terminal III is connected to line L2.Wherein, diode cathode and leading-out terminal III as a pair of normally-closed contact (and unidirectional conducting) control warning circuit (in the prior art, can also find out the multiple warning circuit that triggers with the disconnection of a pair of normally-closed contact).

Among Fig. 5, between a plurality of assemblies online L1 in parallel and the line L2, the leading-out terminal I that is a plurality of assemblies is electrically connected mutually, be connected to line L1, the leading-out terminal III of a plurality of assemblies is electrically connected mutually, be connected to line L2, the shared warning circuit of a plurality of assemblies, the diode cathode of a plurality of assemblies is electrically connected, is connected to light-emitting diode D1 negative pole mutually, D1 positive pole and D2 positive pole and R1 one are terminated at a bit, the R1 other end is connected to L1 (being leading-out terminal I), behind the D2 negative pole serial connection R2, is connected to L2 (being leading-out terminal III).

The warning circuit course of work is as follows in the above-mentioned single or multiple assembly: these 1,3 novel ends are connected in parallel on and need protection between line and the line.Under the normal condition, hot releasing mechanism conducting, green light is connected between L1 and the L2 by R1, diode and hot releasing mechanism, and green light is bright, and red light is not worked by short circuit; After the varistor deterioration, hot releasing mechanism disconnects, and the green light path disconnects, and green light goes out, and red light is connected between L1 and the L2 by R1, R2, and red light is bright.

This novel operation principle is as follows: under the normal condition, this product is in high-impedance state, and 1,3 ends almost do not have electric current to flow through (microampere order), and 2-3 holds unidirectional conducting; When thunder and lightning or the arrival of other switching overvoltage, this product with nanosecond speed conducting response (＜25ns 〉, the level that too high voltage limit can be born at equipment, the lightning current bleed off is arrived ground, after overvoltage was gone over, this product can revert to high-impedance state again, prepared to accept the impact of thunder and lightning next time, in this course, hot releasing mechanism can not move; Longer when line voltage distribution time that raises unusually, amplitude is higher, has surpassed the ability to bear of this product; perhaps when repeatedly the impact of thunder and lightning or switching overvoltage causes this product performance index to drop to a certain degree; under the effect of line voltage distribution, the varistor leakage current increases, the product heating; hot releasing mechanism action (disconnection); varistor breaks away from protected circuit, thereby has cut off contingent fire, simultaneously; diode and III end disconnect, and provide the alarm signal of product deterioration.

This product with the difference of traditional product is:

Surge protection assembly function in the past is single, has only the lightning protection function, do not have heat to break away from function and deterioration warning function, and this product has above function, and difference sees the following form:

The innovative significance of this product is:

(1) this series products does not have heat to break away from function in the past, and product can generate heat when the product overload operation, finally causes product short circuit on fire, breaking out of fire; KPDJ type surge protection assembly has heat and breaks away from function, and when the product overload operation and adstante febre, hot releasing mechanism can in time be cut off the electricity supply, thereby avoids fire to take place.

(2) product construction is single in the past, can not provide alarm signal during deterioration, can not in time find and change product, causes the fire generation and cause protected device damage when being struck by lightning next time; And KPDJ type product has warning function, in time provides the deterioration alarm signal in the product deterioration and when breaking away from circuit, thereby equipment is caused damage when reminds people is in time changed product and avoided the next time thunderbolt.

(3) product that in the past used does not have defencive function after damaging, and when next time, thunderbolt arrived, if in time do not change, will cause the damage of equipment like this; And KPDJ type product is owing to be to be formed in parallel by the multichannel protected location; when breaking away from circuit after the part deterioration therein; the residue protected locations have defencive function; even after deterioration is reported to the police, fail in time to change product like this; this product still has the certain protection function, can prevent that thunder and lightning from damaging protected equipment.

To sum up, this novel (KPDJ type surge protection assembly) is that a kind of novel point of crossing is pressed a protection device, it be with varistor as protection component, add overtemperature protection and deterioration warning function.It is mainly used in lightning protection, the induction thunder of DC power supply or AC power, fields such as anti-switching overvoltage.

Claims

1, a kind of surge protection assembly comprises piezo-resistance, it is characterized in that also having an elastic electrode (2), and elastic electrode one end is electrically connected with piezo-resistance (6) one ends through low temperature scolding tin, and the other end is connected to leading-out terminal (III); Piezo-resistance (6) other end is connected to leading-out terminal (I).

According to the described surge protection assembly of claim 1, it is characterized in that 2, also have a shell (1), shell is divided into two chambers by dividing plate (3); Described piezo-resistance (6) is encapsulated in the chamber of shell (1), described elastic electrode is arranged in another chamber of shell, and the interior electrode (7) that is electrically connected with piezo-resistance one end passes dividing plate and stretches into and be electrically connected with elastic electrode through low temperature scolding tin in another chamber.

3, according to the described surge protection assembly of claim 2, it is characterized in that also having diode (5), diode cathode is connected to piezo-resistance (6) one ends that are electrically connected with elastic electrode (2); Also has the warning circuit of controlling as a pair of normally-closed contact by diode cathode and leading-out terminal (III).

4, according to the described surge protection assembly of claim 3; it is characterized in that; described warning circuit is by luminous second tube sheet D1; D2, resistance R 1, R2 forms; its annexation is: diode (5) positive pole is connected to the D1 negative pole; D1 positive pole, D2 positive pole, R1 one are terminated at a bit, and the R1 other end is connected to leading-out terminal (I), are connected to leading-out terminal (III) behind the D2 negative pole serial connection R2.

According to the described surge protection assembly of claim 3, it is characterized in that 5, described assembly is a plurality of, the leading-out terminal of a plurality of assemblies (I) is electrically connected mutually, leading-out terminal (III) is electrically connected mutually, diode (5) positive pole is electrically connected mutually; Described warning circuit is by luminous second tube sheet D1, D2, resistance R 1, R2 forms, and its annexation is: second tube sheet (5) positive pole is connected to the D1 negative pole, and D1 positive pole, D2 positive pole, R1 one are terminated at a bit, the R1 other end is connected to leading-out terminal (I), is connected to leading-out terminal (III) behind the D2 negative pole serial connection R2.