CN206059066U - A kind of Thermal protection varistor and Surge Protector - Google Patents

Abstract

This utility model provides a kind of Thermal protection varistor and Surge Protector; which includes varistor and thermel protection device; the varistor includes the first varistor and the second varistor, and the thermel protection device is connected between first varistor and the second varistor.This utility model is effectively improved the utilization of the heat that generates heat to varistor so that the movement time of thermel protection device further shortens.

Description

A kind of Thermal protection varistor and Surge Protector

Technical field

This utility model is related to a kind of electronic installation for security protection, particularly a kind of Thermal protection varistor And Surge Protector.

Background technology

Due to IEC61643-11：Version had done technical lifting to 2011 standard in the past relatively, and maximum change is to increase 8.3.5.3.2 has been added to simulate the additional testing of SPD failure modes.

For simple, if SPD can not depart from the preconditioned voltage applying stage, the short circuit current stage will be entered, As the thermel protection device of SPD does not possess short circuit current cut-out ability mostly, it is necessary to keep device by excessively stream and cut off, so Installing and using for product is caused to be subject to certain restrictions.

It is conventional to adopt Thermal Cutoffs (TCO) that the Thermal protection varistor of Thermal protection is carried out to varistor (MOV) for MOV Connect with TCO, principle is as shown in Figure 1.In preconditioned voltage process of the test, MOV generates heat and the heat is transmitted to TCO, when When the temperature of TCO reaches its specified fusing-off temperature, TCO disconnecting circuits.During this heat transfer, a pin of TCO It is connected with the object such as circuit board (PCB), outwards distributes certain heat, thus, it may be difficult to took off in 5 seconds under the electric current of regulation From causing product to enter short circuit current test phase, need external over-current protection device, be likely to cause in test process outer Shell ruptures, and loses shell protection grade, causes the potential risk got an electric shock.

Patent ZL201420306127.1《New Thermal protection varistor and Surge Protector》Disclose a kind of heat to protect Shield varistor, the wherein first electrode of second metal electrode and Thermal Cutoffs of varistor are same electrode, so as to contract Short heat conduction path, improves heat transfer, improves the safety of Thermal protection varistor and the reliability of Thermal protection.But It is, due to not having any heat transfer path between the second electrode and varistor of Thermal Cutoffs so that varistor is bad The heat produced during change is not fully used.

Patent ZL2015203765679《A kind of Thermal protection varistor and combinations thereof element》Although increasing auxiliary heat conduction to lead to Road, but due to increased parts, the process of heat transfer yet suffers from larger thermal resistance, is not reaching to optimal level.

Utility model content

In order to solve the above problems, first purpose of the present utility model is to provide a kind of Thermal protection varistor, its Connect thermel protection device between the varistor that two panels characteristic is close to, two varistors constitute directly heat with thermel protection device Transmission path, when power frequency temporary overvoltage occurs, two panels varistor generates heat simultaneously, and its heat is delivered to Thermal protection dress simultaneously The two ends put, more effectively can conduct heat, time when shortening varistor abnormal heating needed for Thermal Cutoffs disconnecting circuit.

Second purpose of the present utility model is to provide a kind of Surge Protector.

In order to realize above-mentioned first purpose, this utility model provides a kind of Thermal protection varistor, and which includes the first pressure Quick resistance, the second varistor, the thermel protection device being connected between the first varistor and the second varistor.So, heat Protection device two ends are all connected with varistor, and the heat that thermel protection device two ends receive transmission is homogeneous, is conducive to varistor Sending out heat thermogenetic is more rapidly more accurately transferred to thermel protection device through most short path.

Further, varistor include varistor substrate, a MOV metal electrodes, the 2nd MOV metal electrodes, two Individual conductive electrode, two conductive electrodes are located on two surfaces of varistor substrate respectively, a MOV metal electrodes and second MOV metal electrodes are respectively welded and are electrically connected to two conductive electrodes, and varistor is encapsulated using insulant.First MOV Metal electrode, the 2nd MOV metal electrodes generally using making with certain thickness non-ferrous metal, such as copper, copper alloy, aluminum or The electricity of (plating, sintering) with certain thickness (typically larger than 0.1mm) metal material aluminium alloy, or on the insulating material painting Pole etc..So, these metal electrodes are both the good conductor of heat, and the good conductor of electricity.

Further, Thermal protection varistor also includes outer electrode, and outer electrode includes the first outer electrode and second Outer electrode, the first outer electrode are directly electrically connected with a MOV metal electrodes of the first varistor, the second outer electrode with 2nd MOV metal electrodes of the second varistor are directly electrically connected；Thermel protection device one end and the 2nd MOV of the first varistor Metal electrode is electrically connected, and the other end is electrically connected with a MOV metal electrodes of the second varistor.The outer electrode is used to incite somebody to action this The Thermal protection varistor of utility model is connected with extraneous circuit.The outer electrode can be connected to by welding or crimping mode Varistor, and form entirety.The thermel protection device one end can pass through welding with the 2nd MOV metal electrodes of the first varistor Or crimping mode is electrically connected, the other end can be by welding or the side of crimping with a MOV metal electrodes of the second varistor Formula is electrically connected.

Further, a MOV metal electrodes of the first outer electrode and the first varistor are integrated electrode, outside second The 2nd MOV metal electrodes for drawing electrode and the second varistor are integrated electrode.By outer electrode and corresponding varistor electricity Pole is set to bulk electrode, simplifies structure, reduces the technical process in production process.

Further, Thermal protection varistor also includes shell, the first varistor, the second varistor and Thermal protection dress Put and be loaded in the shell, the first outer electrode and the second outer electrode are stretched out from shell.

Further, thermel protection device is at least two thermel protection devices in parallel.The Thermal protection dress of at least two parallel connections Put and can preferably match varistor, obtain the anti-surge ability suitable with varistor.

Further, thermel protection device is alloy-type temperature fuse, it include a TCO electrodes, the 2nd TCO electrodes and Weld and be connected electrically in the low-melting alloy silk between a TCO electrodes and the 2nd TCO electrodes；The first of first varistor MOV metal electrodes, conductive electrode, the first varistor substrate, conductive electrode, the 2nd MOV metal electrodes and alloy-type temperature are protected First TCO electrodes of dangerous silk, low-melting alloy silk, the 2nd TCO electrodes, a MOV metal electrodes of the second varistor press suitable Sequence is connected.

Further, the 2nd MOV metal electrodes and a TCO electrodes of alloy-type temperature fuse of the first varistor For same electrode；2nd TCO electrodes of alloy-type temperature fuse are same with a MOV metal electrodes of the second varistor Electrode.It is set to bulk electrode and advantageously reduces thermal resistance, also simplify structure, reduces the technical process in production process.

Further, thermel protection device is the switch of the alloy sheet with elastic deformability, and one end of alloy sheet switch leads to Cross low-melting alloy and the first pressure-sensitive electric bond pads, the other end and the riveting of the second varistor.The alloy sheet switch can be phosphorus Bronze sheet stamping is formed, or beryllium copper sheet stamping is formed, and can also be bimetal leaf etc..It is abnormal when receiving During heat, the other end of alloy sheet switch will be flicked, and disconnect the connection with varistor.

Further, thermel protection device is organic type Thermal Cutoffs.

In order to realize above-mentioned second purpose, this utility model provides a kind of Surge Protector, and which includes above-mentioned heat guarantor Shield varistor.

Compared with existing Thermal protection varistor, this utility model has the advantages that：

(1) present invention is effectively improved the heat for causing varistor heating to electric current in varistor deterioration process Utilize, on the one hand, using the product of 125 DEG C of thermel protection devices, IEC 61643-11 can be met：In 2011 standard 8.3.5.3.2 the requirement of the additional testing of simulation SPD failure modes；Second aspect can improve rated function temperature and bring up to Between 145 DEG C to 200 DEG C, thus can by the upper limit working temperature of the use temperature of Thermal protection varistor bring up to 85 DEG C with On, it might even be possible to reach 125 DEG C；The third aspect, the present invention can cause further shorten the movement time of thermel protection device, subtract Time of few varistor in deterioration state, the probability of varistor puncture short is further reduced, fire risk is reduced Occur；Fourth aspect, due to improve the transmission to varistor caloric value under transient overvoltage (TOV), the Thermal protection for being Varistor can complete hot disengaging action before short-circuit condition is occurred without when TOV occurs, and improve by Thermal protection varistor The anti-temporary overvoltage ability of the Surge Protector of manufacture；

(2) heat transfer more effectively, while reducing the part of auxiliary heat transfer part, is eliminated in production process with regard to auxiliary The assembling of heat transfer part part.

Description of the drawings

Fig. 1 illustrates Thermal protection varistor of the prior art；

Fig. 2 illustrates the schematic diagram of Thermal protection varistor of the present utility model；

Fig. 3 illustrates the explosive view of one embodiment of Thermal protection varistor of the present utility model；

Fig. 4 illustrates the axonometric chart after Thermal protection varistor combination of the present utility model；

Fig. 5 illustrates another schematic diagram of Thermal protection varistor of the present utility model；

Wherein：

1 first varistor

11 first varistor substrates

First MOV metal electrodes of 12 first varistors

2nd MOV metal electrodes of 13 first varistors

2 thermel protection devices

21 housings

22 the 2nd TCO electrodes

23 low-melting alloy silks

24 the oneth TCO electrodes

3 second varistors

31 second varistor substrates

First MOV metal electrodes of 32 second varistors

2nd MOV metal electrodes of 33 second varistors

41 first outer electrodes

42 second outer electrodes

5 enclosure systems

51 lower covers

52 shells

Specific embodiment

Embodiment 1

Fig. 2 shows the schematic diagram of Thermal protection varistor of the present utility model, and wherein Thermal protection varistor includes pressure Quick resistance and thermel protection device, varistor include the first varistor 1 and the second varistor 3, and thermel protection device 2 is connected on Between first varistor 1 and the second varistor 3.

Embodiment 2

Referring to Fig. 3-4, a kind of new Thermal protection varistor includes the first varistor 1, the second varistor 3, string The thermel protection device 2, outer electrode being associated between the first varistor 1 and the second varistor 3 and enclosure system 5.

First varistor 1 includes varistor substrate 11, a MOV metal electrodes 12 and second of energy thermal conductivity MOV metal electrodes 13；First MOV metal electrodes 12, the 2nd MOV metal electrodes 13 are made of copper；The varistor substrate it Two surfaces are designed with conductive electrode, MOV metal electrodes 12 and the 2nd MOV metal electrodes 13 are respectively welded and electricity connects two and leads Electrode；First varistor 1 is encapsulated using insulant；

Thermel protection device 2 is alloy-type temperature fuse, and which includes housing 21, a TCO electrodes 24, the 2nd TCO electrodes 22 and the low-melting alloy silk 23 on being welded on a TCO electrodes 24 and the 2nd TCO electrodes 22, the of first varistor Two MOV metal electrodes 13 and a TCO electrodes 24 are same bulk electrode, and are electrically connected with low-melting alloy silk 23, the 2nd MOV There are no other with the B alloy wire 23 and be connected in metal electrode 13.

First TCO electrodes 24, the 2nd TCO electrodes 22 and low-melting alloy silk 23 all pass through housing 21 respectively and are installed in one Rise.The thermel protection device 2 also includes flux disconnected agent and sealing resin, and the low-melting alloy silk 23, the envelope are wrapped up in the disconnected agent of fluxing Mouth resin constitutes closed containing cavity fixed TCO electrodes with the housing, and the closed containing cavity accommodates is fluxed what disconnected agent was wrapped in by this Low-melting alloy silk 23.

Second varistor 3 includes varistor substrate 31, a MOV metal electrodes 32 and second of energy thermal conductivity MOV metal electrodes 33, a MOV metal electrodes 32 and the 2nd MOV metal electrodes 33 are made of copper；The varistor substrate it Two surfaces are designed with conductive electrode, MOV metal electrodes 32 and the 2nd MOV metal electrodes 33 are respectively welded and electricity connects two and leads Electrode；Second varistor 3 is encapsulated using insulant.

2nd MOV metal electrodes 13 of first varistor 1 and a TCO electrodes 24 are same bulk electrode；2nd TCO Electrode 22 is same bulk electrode with the MOV metal electrodes 32 for the second varistor 3.

Outer electrode includes the first outer electrode 41 and the second outer electrode 42, first outer electrode 41 and first pressure First MOV metal electrodes 12 of quick resistance are integrated electrode；Second outer electrode 42 is golden with the 2nd MOV of second varistor Category electrode 33 is integrated electrode.

Enclosure system 5 includes lower cover 51 and shell 52, and first outer electrode 41 is passed through with second outer electrode 42 should Lower cover 52 stretches out；The shell 52 and 51 clamping of lower cover, Thermal protection varistor is loaded wherein.

Embodiment 3

It is different only in that a MOV metal electrodes 12a and the 2nd MOV metal electrode 13a are made of aluminum with embodiment 2, with And thermel protection device is organic type Thermal Cutoffs.

Embodiment 4

It is different only in that with embodiment 2 alloy-type temperature fuse is replaced with the alloy sheet with elastic deformability opens Close.2 one end of thermel protection device and the 2nd MOV metal electrodes 13 of the first varistor for alloy sheet switch rivets or electric resistance welding Welding；First MOV metal electrodes 32 of the other end and the second varistor are overlapped using low-melting alloy, or can be set on the contrary Put.When alloy sheet switch receives abnormal heat, melt with the low-melting alloy of 32 overlapped points of a MOV metal electrodes, So that the thermel protection device 2 of the flexible deformability is flicked, disconnecting circuit.

Embodiment 5

Difference from Example 2 is that thermel protection device is composed in parallel by two thermel protection devices, its principle such as Fig. 5 institutes Show.Thermel protection device can be composed in parallel for two alloy-type temperature fuses, can be two organic type Thermal Cutoffs Compose in parallel, or two alloy sheet switch in parallel compositions.

Embodiment 6

The Thermal protection varistor that embodiment 2 is obtained is sample 1, and its nominal varistor voltage is 510V.Electricity is carried out to sample 1 Pressure test experiments, are 800V in the temporary overvoltage amplitude for applying to simulate, and short circuit current is respectively 15A, 10A, during 5A, from applying Voltage was recorded such as table 1 respectively to the movement time that its thermel protection device departs from.

Table 1：Sample 1 carries out 800V temporary overvoltage test results

Short circuit current A	15	15	10	10	5	5
							Movement time s	2.52	2.51	6.13	5.31	8.35	7.86

Comparative example 1

It is sample 2 that the Thermal protection varistor for obtaining is made by patent ZL2015203765679, and its nominal varistor voltage is 510V, carries out contrast test by above-mentioned condition, and its movement time is recorded respectively such as table 2.

Table 2：Sample 2 carries out 800V temporary overvoltage test results

Short circuit current A	15	15	10	10	5	5
							Movement time s	33.7	28.2	36.9	32.8	17.6	18.9

Relatively Tables 1 and 2, can significantly find out that the embodiment of the present application 2 is obtained either under which short circuit current Thermal protection varistor movement time for departing from faster, illustrate the heat transfer of the Thermal protection varistor more it is rapid accurately, its Thermo-lag effectiveness is more preferable.

It should be appreciated that above-described embodiment of the present utility model is only intended to clearly illustrate this utility model example, And it is not the restriction to embodiment of the present utility model.For those of ordinary skill in the field, state upper Can also make other changes in different forms on the basis of bright.Here all of embodiment cannot be given thoroughly Lift.It is every belong to the technical solution of the utility model it is amplified obvious change or change still in this utility model Protection domain row.

Claims (11)

1. a kind of Thermal protection varistor, it is characterised in that the Thermal protection varistor includes varistor and Thermal protection dress Put, the varistor includes the first varistor and the second varistor, the thermel protection device is connected on first pressure Between quick resistance and the second varistor.

2. Thermal protection varistor according to claim 1, it is characterised in that the varistor includes varistor base Piece, a MOV metal electrodes, the 2nd MOV metal electrodes, two conductive electrodes, two conductive electrodes are respectively positioned at pressure-sensitive On two surfaces of resistance substrate, a MOV metal electrodes and the 2nd MOV metal electrodes are respectively welded and are electrically connected to two The individual conductive electrode, the varistor are encapsulated using insulant.

3. Thermal protection varistor according to claim 2, it is characterised in that the Thermal protection varistor also includes outer Draw electrode, the outer electrode includes the first outer electrode and the second outer electrode, and first outer electrode is pressure-sensitive with first First MOV metal electrodes of resistance are directly electrically connected, the 2nd MOV metals electricity of second outer electrode and the second varistor Extremely directly electrically connect；Described thermel protection device one end is electrically connected with the 2nd MOV metal electrodes of first varistor, another End is electrically connected with a MOV metal electrodes of second varistor.

4. Thermal protection varistor according to claim 3, it is characterised in that first outer electrode is pressure-sensitive with first First MOV metal electrodes of resistance are integrated the 2nd MOV metals electricity of electrode, second outer electrode and the second varistor Extremely bulk electrode.

5. Thermal protection varistor according to claim 3, it is characterised in that the Thermal protection varistor also includes outer Shell, first varistor, the second varistor and the thermel protection device are loaded in the housing, are drawn outside described first Electrode and the second outer electrode are stretched out from the shell.

6. Thermal protection varistor according to claim 1, it is characterised in that the thermel protection device be it is in parallel at least Two thermel protection devices.

7. the Thermal protection varistor according to any one of claim 1-6, it is characterised in that the thermel protection device is Alloy-type temperature fuse, it include a TCO electrodes, the 2nd TCO electrodes and weld and be connected electrically in a TCO electrodes and Low-melting alloy silk between 2nd TCO electrodes；First MOV metal electrodes of first varistor, conductive electrode, first Varistor substrate, conductive electrode, the 2nd MOV metal electrodes and a TCO electrodes, low-melting alloy silk, the 2nd TC0 electrodes, First MOV metal electrodes of second varistor are connected in order.

8. Thermal protection varistor according to claim 7, it is characterised in that the 2nd MOV of first varistor Metal electrode and a TCO electrodes are same electrode；The 2nd TCO electrodes are golden with a MOV of second varistor Category electrode is same electrode.

9. the Thermal protection varistor according to any one of claim 1-6, it is characterised in that the thermel protection device is Alloy sheet with elastic deformability switch, one end of the alloy sheet switch pass through low-melting alloy and first pressure-sensitive electric group Welding, the other end and the riveting of the second varistor.

10. the Thermal protection varistor according to any one of claim 1-6, it is characterised in that the thermel protection device For organic type Thermal Cutoffs.

A kind of 11. Surge Protectors, including the Thermal protection varistor in the claims 1-10 described in any claim.