CN203456871U

CN203456871U - Large-flow surge protector

Info

Publication number: CN203456871U
Application number: CN201320558598.7U
Authority: CN
Inventors: 张雷
Original assignee: GUIYANG HIGH-TECH YIGE ELECTRONICS CO LTD
Current assignee: GUIYANG HIGH-TECH YIGE ELECTRONICS CO LTD
Priority date: 2013-09-10
Filing date: 2013-09-10
Publication date: 2014-02-26
Anticipated expiration: 2023-09-10

Abstract

The utility model discloses a large-flow surge protector. The surge protector comprises two pressure-sensitive lightning protection chips (2) arranged in a module box (1) in parallel. The cathodes of the pressure-sensitive lightning protection chips (2) are connected, forming a common inner electrode (3) which is connected with a cathode lead-out pin (4). Anode heat disconnecting points (5) of the two pressure-sensitive lightning protection chips (2) are respectively connected with an upper heat disconnecting spring (6) and a lower disconnecting spring (7) which are connected with an anode lead-out pin. According to the utility model, each of two ZnO lightning protection chips is provided with a heat disconnecting point, so that if one of the ZnO lightning protection chips is malfunctioned and is heat-disconnected from the circuit, the other chip can still provide the lightning protection function; besides, the chips are completely symmetrically parallel by a second outer electrode A and a second outer electrode B, so that the current is uniformly distributed, and the residual voltage on the surge protector is effectively reduced.

Description

Large-discharge surge protector

Technical field

The utility model relates to a kind of surge protector, relates in particular to a kind of large-discharge surge protector.

Background technology

Surge protector is indispensable a kind of device in electronic equipment lightning protection; the effect of surge protector is that the instantaneous overvoltage of scurrying into power line, signal transmssion line is limited in the voltage range that equipment or system can bear; or powerful lightning current is let out to inflow place, protection equipment or system are not hit and damage.Surge protector is to take ZnO lightning-proof chip as main element; combined hot releasing mechanism etc.; there is good non-linear behaviour and large through-current capability, as lightning surge protection component, in electronic circuit and electric power system, be widely used, guaranteed the safe operation of equipment.

Monolithic ZnO lightning-proof chip is owing to being subject to electronic ceramic limits of fabrication techniques now, its tolerance high current impulse withstanding capability is relatively poor, less for B level SPD, at present, mostly adopt the parallel connection of two ZnO lightning-proof chips to improve the high current impulse withstanding capability of SPD, the disengaging of large through-flow SPD device and connection, it is middle certain position of tripping electrode sheet that relies on piezoresistive element, strike out projecting surface or Zhe Wan Cheng ∟ type, during epoxy encapsulation, reserve tripping electrode sheet projecting surface or folding surface, an external electrode welds mutually by low-melting alloy and tripping electrode sheet projecting surface or folding surface.But ZnO lightning-proof chip need to adopt copper sheet to carry out connecting circuit when in parallel, under the effect of pulse current, its impedance comparison is large, causes the current unevenness on ZnO lightning-proof chip in parallel, reduce the high current impulse withstanding capability of SPD, therefore can not bring into play to greatest extent effect in parallel.On the other hand, compare the SPD of monolithic lightning-proof chip, the through-current capability of biplate ZnO lightning-proof chip SPD in parallel is almost doubled in theory, the sectional area of tripping electrode, trip point also will increase accordingly, yet be subject to the restriction in space, the area that can increase is less, can not meet large through-flow requirement.These two serious technological deficiencies all make its tolerance high current impulse withstanding capability have a greatly reduced quality, and can not effectively prevent that large through-flow SPD lost efficacy under heavy current impact.

Summary of the invention

the technical problems to be solved in the utility model is,for the above-mentioned defect existing in prior art, even if provide a kind of, under tolerance heavy current impact, also can there is the large-discharge surge protector of lower residual voltage, higher reliability, can overcome the deficiencies in the prior art.

The technical solution of the utility model is: large-discharge surge protector; comprise the pressure-sensitive lightning-proof chip that is positioned at module box body 1; pressure-sensitive lightning-proof chip is that two employings are arranged in parallel; electrode in its negative pole is interconnected to form and shares; in sharing, electrode is connected with negative electrode leading foot; on the just very hot dispersal point of two pressure-sensitive lightning-proof chips, be connected with respectively heat and depart from shell fragment and lower disengaging shell fragment, upper heat departs from shell fragment and is connected with positive electrode leading foot respectively with lower disengaging shell fragment.

Above-mentioned large-discharge surge protector is, on being hinged with respectively, cut off plate and lower cut-out plate on the end face of module box body, the stage casing of upper cut-out plate between upper heat departs from shell fragment and just very hot dispersal point, end is connected with the upper surface spring in extended state, the other end of upper surface spring is fixed on module box body; The stage casing of lower cut-out plate between lower heat departs from shell fragment and just very hot dispersal point, end is connected with the lower surface spring in extended state, the other end of lower surface spring is fixed on module box body.

Aforesaid large-discharge surge protector is that just very hot dispersal point is positioned at the zone line of pressure-sensitive lightning-proof chip.

Compared with the prior art, the utility model, owing to having adopted technique scheme, is all provided with hot dispersal point on two ZnO lightning-proof chips, and when wherein the inefficacy of a slice ZnO lightning-proof chip is from circuit after heat disengaging, another sheet chip still can play the effect of lightning protection; In addition, because chip in parallel is in parallel by the second external electrode A and the second external electrode B full symmetric, thereby CURRENT DISTRIBUTION has evenly reduced the residual voltage of surge protector effectively.The 3rd, between spring leaf and pressure-sensitive lightning-proof chip, adopted the cut-out plate of holding with spring, when low temperature melts soldering tin, cut off plate cut-off loop rapidly under the effect of spring, heat disengaging reliability is high.

accompanying drawing explanation:

Fig. 1 is structural representation of the present utility model;

Fig. 2 is perspective view of the present utility model.

embodiment:

Embodiment 1, as illustrated in fig. 1 and 2, the pressure-sensitive lightning-proof chip 2 of the present embodiment core is the Q-RING epoxy resins packaged chip that two length of sides are 34mm, the pressure sensitive voltage of pressure-sensitive lightning-proof chip 2 is 620V, its power frequency breakdown point is at chip middle part, be placed in insulation module box body 1, two pressure-sensitive lightning-proof chips 2 adopt and are arranged in parallel, electrode 3 in its negative pole is interconnected to form and shares, in sharing, electrode 3 is connected with the negative electrode leading foot 4 being fixed on insulation module box body 1, on the just very hot dispersal point 5 of two pressure-sensitive lightning-proof chips 2, be connected with respectively heat and depart from shell fragment 6 and lower disengaging shell fragment 7, just very hot dispersal point 5 is positioned at the zone line of pressure-sensitive lightning-proof chip 2, the connection that upper heat departs from shell fragment 6 and lower disengaging shell fragment 7 is connected by low temperature scolding tin, the fusing point of low temperature scolding tin is 110 ℃-150 ℃, upper heat departs from shell fragment 6 and is connected with positive electrode leading foot 8 respectively with lower disengaging shell fragment 7.

On being hinged with respectively, cut off plate 9 and lower cut-out plate 10 on the end face of module box body 1, the stage casing of upper cut-out plate 9 between upper heat departs from shell fragment 6 and just very hot dispersal point 5, end is connected with the upper surface spring 11 in extended state, the other end of upper surface spring 11 is fixed on module box body 1; The stage casing of lower cut-out plate 10 between lower heat departs from shell fragment 7 and just very hot dispersal point 5, end is connected with the lower surface spring 12 in extended state, the other end of lower surface spring 12 is fixed on module box body 1.Under long-time, the high power frequency function of current, low temperature melts soldering tin, upper heat departs from electrode 6, lower heat departs from electrode 7 and departs from just very hot dispersal point 5, cut off plate pivots under spring tension effect, intercepted the electrical connection of positive electrode leading foot 8 with pressure-sensitive lightning-proof chip 2 completely, cut off issuable electric arc and connected, sensitive switch action simultaneously, the red colour code that cuts off the plate other end blocks and shows window, and remote alarms and onsite alarming are provided.

The above refers to that embodiment is only preferred embodiment of the present utility model; not with this, limit practical range of the present utility model; therefore the equivalence that all shapes according to the utility model, structure and principle are done changes, and all should be covered by protection range of the present utility model.

Claims

1. a large-discharge surge protector; comprise the pressure-sensitive lightning-proof chip (2) that is positioned at module box body (1); it is characterized in that: pressure-sensitive lightning-proof chip (2) is that two employings are arranged in parallel; electrode (3) in its negative pole is interconnected to form and shares; in sharing, electrode (3) is connected with negative electrode leading foot (4); on the just very hot dispersal point (5) of two pressure-sensitive lightning-proof chips (2), be connected with respectively upper heat and depart from shell fragment (6) and lower disengaging shell fragment (7), upper heat departs from shell fragment (6) and is connected with positive electrode leading foot (8) respectively with lower disengaging shell fragment (7).

2. large-discharge surge protector according to claim 1, it is characterized in that: on the end face of module box body (1), be hinged with respectively upper cut-out plate (9) and lower cut-out plate (10), the stage casing of upper cut-out plate (9) is positioned at that heat departs between shell fragment (6) and just very hot dispersal point (5), end is connected with the upper surface spring (11) in extended state, and the other end of upper surface spring (11) is fixed on module box body (1); The stage casing of lower cut-out plate (10) is positioned at that lower heat departs between shell fragment (7) and just very hot dispersal point (5), end is connected with the lower surface spring (12) in extended state, and the other end of lower surface spring (12) is fixed on module box body (1).

3. large-discharge surge protector according to claim 1, is characterized in that: just very hot dispersal point (5) is positioned at the zone line of pressure-sensitive lightning-proof chip (2).