CN2615943Y - Tight assembling piezo-resistive overvoltage protector - Google Patents
Tight assembling piezo-resistive overvoltage protector Download PDFInfo
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- CN2615943Y CN2615943Y CN 03229909 CN03229909U CN2615943Y CN 2615943 Y CN2615943 Y CN 2615943Y CN 03229909 CN03229909 CN 03229909 CN 03229909 U CN03229909 U CN 03229909U CN 2615943 Y CN2615943 Y CN 2615943Y
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- piezo
- resistance
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- protection
- insurance
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Abstract
A tight composite varistor type over-voltage protective device comprises a varister RV ( 1 ) cross-over connected with two ends of power source, in particular to a thermal fuse FT ( 2 ), which is tight connected in series with one end of the varister RV ( 1 ). By utilizing the composite varistor for fire-preventing which is safe and reliable, the utility model not only accomplishes over-voltage protection, but also has faster response and lower cost. Security of the varister can be ensured and the vatister can take place of a head fusing, simultaneously meeting the welding technological requirements. The utility model has simple manufacturing process which is easy to spread.
Description
Technical field
The utility model relates to over-voltage protection technique, particularly the over-voltage protection technology of supplementary protection circuit.
Background technology
Piezo-resistance is widely used in various excess voltage protections.Owing to be low resistive state during pressure responsive resistor failure, leakage current increases, and temperature raises, so will add protective circuit, when pressure responsive resistor failure it is opened from circuit interruption, otherwise will cause the piezo-resistance catching fire, thereby cause fire.
A kind of piezo-resistance overvoltage crowbar of prior art as shown in Figure 1; this is a kind of traditional protective circuit; when piezo-resistance RV lost efficacy; its chip is low resistive state; electric current in the circuit can sharply increase, fuse FU fusing, thereby protection load; also piezo-resistance RV is opened from circuit interruption simultaneously, avoid piezo-resistance RV catching fire.The problem that sort circuit exists is: when brownout in the loop or impedance were excessive, fault current was less, the fuse FU that can not fuse or can not in time fuse, and cause piezo-resistance RV temperature too high to catching fire, thus cause fire.
Another kind of example is the piezo-resistance protective circuit that No. 00237913.9 Chinese patent " safe type piezoresistor " proposes in the prior art, as shown in Figure 2.Fig. 2-2 is its internal structure, piezo-resistance Rv and Temperature protection Fw with the heat-conduction medium mutual insulating be encapsulated in the same housing, stretch out outside the housing termination of piezo-resistance and Temperature protection.Its operation principle is that the Temperature protection that will be located at the piezo-resistance next door is connected in the power circuit, and when the voltage value of being above standard, the piezo-resistance Rv electric current that is low resistance sharply increases, and makes electric current insurance Fs fusing, plays the overvoltage protection effect; And voltage is in critical normal voltage or because of other power supply disturbs the piezo-resistance temperature is raise; but can not cause under the situation of electric current insurance Fs fusing; place the other Temperature protection Fw of piezo-resistance to heat up because of heat conduction; in case arriving design temperature is fusible; cut off the electricity supply, play the temperature effect of protection automatically.This safe type piezoresistor is preventing that piezo-resistance from having certain effect aspect on fire, but also there is following shortcoming: the firstth, reaction speed is slower, poor effect when pressure responsive resistor failure heats up rapidly, because it is through piezo-resistance surface insulation layer, heat-conduction medium, the housing of Temperature protection Fw, the filler of Temperature protection Fw inside that piezo-resistance Rv goes up the heat that produces, just pass on the melt of Temperature protection Fw then, heat conduction velocity is slow, only is applicable to the situation that temperature slowly raises.As situation in electric rice cooker, motor windings etc. or the slow increase of piezo-resistance leakage current, puncture and also tend to instantaneous short circuit during pressure responsive resistor failure, cross situation low or that impedance loop is excessive at supply voltage, undercurrent is so that electric current insurance Fs fusing, the temperature of piezo-resistance can raise rapidly in moment, can be because heat conduction path to be long, Temperature protection can't in time move and cause the piezo-resistance catching fire.The secondth, welding procedure is difficult to control, because Temperature protection is very responsive to temperature, when circuit board welded, the heat on the Temperature protection pin can reach rapidly on the melt, tends to occur Temperature protection and mistake fusing situation occurs when welding.
Summary of the invention
The utility model is the above-mentioned deficiency that overcomes prior art; propose a kind of utilize safe and reliable, prevent that composite type piezo-resistance on fire from bearing the device of overvoltage protection; not only can finish overvoltage protection; and response speed is faster, cost is cheaper; piezo-resistance safety itself also can obtain to ensure, can also substitute total insurance, satisfies the standard welding process requirement simultaneously; manufacturing process is simple, is easy to promote.
The purpose of this utility model can reach by adopting following technical measures:
Design, a kind of formula piezoresistive over-pressure safety device that closely combines of manufacturing comprise the piezo-resistance RV that is connected across both ends of power, and the end of especially described piezo-resistance RV is serially connected with the thermal fuse FT that closely combines with this piezo-resistance RV.
The utility model compared with prior art, identical point is that piezo-resistance RV 1 is all arranged, and all is that to utilize heat conduction protection, difference be the Temperature protection finished product that does not adopt individual packages, and uses the hot melt insurance; Both heat conduction paths are also different.In addition, the utility model need not carry out heat conduction and lean on two parts directly to contact by extra heat-conduction medium, thereby quicker response is arranged and more reliable protection is provided.
Operation principle of the present utility model is: because the chip of piezo-resistance RV 1 closely is being connected assembled in series with the melt of hot melt insurance FT 2, when piezo-resistance RV 1 lost efficacy, fault current can be transmitted to rapidly at the heat that produces on its chip on the melt of hot melt insurance FT 2, both temperature rise basic synchronization; Select the melt of suitable fusing point, in the time of can being elevated to uniform temperature at the chip of piezo-resistance RV 1, make the melt quick-break of hot melt insurance FT 2, thereby under two kinds of situations of piezo-resistance RV 1 slow temperature rise or temperature rise rapidly, all can be rapidly reliably piezo-resistance RV 1 be opened from circuit interruption, avoid the catching fire initiation fire.
Compare with the first routine prior art, the utility model can be in circuit fault current also not too big and under the situation that the voltage dependent resistor chip temperature is very high the inefficacy piezo-resistance is opened from circuit interruption, thereby prevent the generation of fire.Compare with the safe type piezoresistor of the second routine existing technology; fault current directly promptly acts on the melt of hot melt insurance FT 2 at the heat that produces on piezo-resistance RV 1 chip; response speed is higher; the problem on fire that causes under the rapid two kinds of situations that heat up and slowly heat up in the time of can solving pressure responsive resistor failure in the lump; and the anti-sweating heat conducting power of its hot melt melt is stronger; welding process requirement is simple, can satisfy scale production needs such as wave soldering technology.In addition because do not need the Thermal Cutoffs of finished product, even available common solder stick or low melting point fuse do the melt of hot melt insurance FT 2, and cost is also just cheaper.
Brief Description Of Drawings:
Fig. 1 is a kind of piezo-resistance formula of prior art overvoltage crowbar schematic diagram;
Fig. 2 is another kind of supplementary protection type piezo-resistance formula overvoltage crowbar of prior art and supplementary protection type piezo-resistance structural representation;
Fig. 3 is that the utility model closely combines formula thermosensitive resistance type over-pressure safety device winding diagram and closely combines formula thermistor encapsulation schematic diagram;
Fig. 4 is the box-like piezo-resistance encapsulation of another embodiment circuit interconnect pattern of a utility model and tap group schematic diagram;
Fig. 5 omits traditional insurance silk embodiment overvoltage protection circuit interconnect pattern.
Embodiment
Further specify embodiment of the present utility model below in conjunction with accompanying drawing.
A kind of formula piezoresistive over-pressure safety device that closely combines comprises the piezo-resistance RV 1 that is connected across both ends of power, and it is characterized in that: the end of described piezo-resistance RV 1 is serially connected with the thermal fuse FT 2 that closely combines with this piezo-resistance RV 1.
Described thermal fuse FT 2 is attached directly on the chip of described piezo-resistance RV 1.And need not add heat-conduction medium in addition, and reduce conduction time, reduce cost.
Under some embodiment situations, described thermal fuse FT 2 one ends connect power input through total insurance FU; Another termination output loading that it is connected with described piezo-resistance RV 1 has kept the traditional insurance silk.And under other embodiment situations, described thermal fuse FT 2 one termination power inputs; Another termination output loading that it is connected with described piezo-resistance RV 1.Back one embodiment has discarded common fuse, has simplified wiring, has further reduced cost.
In the practical application, Fig. 3-2 is depicted as a kind of embodiment of piezo-resistance protection.The melt of the chip of piezo-resistance RV 1 and hot melt insurance FT 2 assembled in series of combining closely, the non-series connection termination B of the non-series connection end A of piezo-resistance RV 1 and hot melt insurance FT 2 draws respectively.
Fig. 3-1 is a kind of embodiment of the utility model overvoltage protection, and end A and termination B are connected on both ends of power respectively, loses efficacy when overheated at piezo-resistance RV 1, and hot melt insurance FT 2 fusing are opened piezo-resistance RV 1 from circuit interruption; If total insurance FU is failure to actuate, equipment also can work on.
Fig. 4-2 is depicted as the embodiment of another kind of piezo-resistance protection; the melt of the chip of piezo-resistance RV 1 and hot melt insurance FT 2 assembled in series of combining closely; the non-series connection termination B of piezo-resistance RV 1 non-series connection end A and hot melt insurance FT 2, and termination, coupling part C draws respectively.
Fig. 4-1 is three tap embodiment excess voltage protection winding diagrams; with end A and termination B input as power supply; with termination C and termination B output loading end as power supply; when piezo-resistance RV 1 inefficacy is overheated; hot melt insurance FT 2 fusing; piezo-resistance RV 1 is opened from circuit interruption, cut off the electricity supply simultaneously, avoid equipment under the situation that does not have the piezo-resistance protection, to work.
Fig. 5 is for omitting the excess voltage protection winding diagram of traditional insurance silk.End A and termination B are as the input of power supply, and termination C and termination B are as the output loading end of power supply.Lost efficacy when overheated at piezo-resistance RV 1, hot melt insurance FT 2 fusing are opened piezo-resistance RV 1 from circuit interruption, cut off the electricity supply simultaneously.Different with other embodiment is, does not have common power safety FU in the circuit, and hot melt insurance FT 2 always insures use as power supply simultaneously.
Claims (4)
1, a kind of formula piezoresistive over-pressure safety device that closely combines comprises the piezo-resistance RV (1) that is connected across both ends of power, it is characterized in that:
The end of described piezo-resistance RV (1) is serially connected with the thermal fuse FT (2) that closely combines with this piezo-resistance RV (1).
2, over-pressure safety device according to claim 1 is characterized in that:
Described thermal fuse FT (2) is attached directly on the chip of described piezo-resistance RV (1).
3, over-pressure safety device according to claim 2 is characterized in that:
Described thermal fuse FT (2) one ends connect power input through total insurance FU; Another termination output loading that it is connected with described piezo-resistance RV (1).
4, over-pressure safety device according to claim 2 is characterized in that:
Described thermal fuse FT (2) one termination power inputs; Another termination output loading that it is connected with described piezo-resistance RV (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03229909 CN2615943Y (en) | 2003-03-26 | 2003-03-26 | Tight assembling piezo-resistive overvoltage protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03229909 CN2615943Y (en) | 2003-03-26 | 2003-03-26 | Tight assembling piezo-resistive overvoltage protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2615943Y true CN2615943Y (en) | 2004-05-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03229909 Expired - Lifetime CN2615943Y (en) | 2003-03-26 | 2003-03-26 | Tight assembling piezo-resistive overvoltage protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2615943Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006063503A1 (en) * | 2004-12-13 | 2006-06-22 | Zhonghou Xu | Varistor with an alloy-type temperature fuse |
| CN102904238A (en) * | 2012-10-24 | 2013-01-30 | 深圳市雷博斯科技有限公司 | Overheat, overcurrent and overvoltage lightning protector |
-
2003
- 2003-03-26 CN CN 03229909 patent/CN2615943Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006063503A1 (en) * | 2004-12-13 | 2006-06-22 | Zhonghou Xu | Varistor with an alloy-type temperature fuse |
| US8780521B2 (en) | 2004-12-13 | 2014-07-15 | Zhonghou Xu | Metal oxide varistor with built-in alloy-type thermal fuse |
| CN102904238A (en) * | 2012-10-24 | 2013-01-30 | 深圳市雷博斯科技有限公司 | Overheat, overcurrent and overvoltage lightning protector |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: ZTE CO., LTD. Free format text: FORMER OWNER: SHENZHENG CITY ZTE CO., LTD. SHANGHAI SECOND INSTITUTE Effective date: 20040521 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20040521 Address after: 518057 Department of law, Zhongxing building, South hi tech Industrial Park, Nanshan District hi tech Industrial Park, Guangdong, Shenzhen Patentee after: ZTE Corporation Address before: 200233 No. 396, Shanghai, Guilin Road Patentee before: Shanghai Inst. of No.2, Zhongxing Communication Co., Ltd., Shenzhen City |
|
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20130326 Granted publication date: 20040512 |