CN202494703U - High-voltage mistaken-detection protective universal meter - Google Patents
High-voltage mistaken-detection protective universal meter Download PDFInfo
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- CN202494703U CN202494703U CN 201220054155 CN201220054155U CN202494703U CN 202494703 U CN202494703 U CN 202494703U CN 201220054155 CN201220054155 CN 201220054155 CN 201220054155 U CN201220054155 U CN 201220054155U CN 202494703 U CN202494703 U CN 202494703U
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- 230000001681 protective effect Effects 0.000 title abstract 5
- 238000001514 detection method Methods 0.000 title abstract 3
- 238000006757 chemical reactions by type Methods 0.000 claims abstract description 12
- 239000002131 composite material Substances 0.000 claims abstract description 12
- 101000669528 Homo sapiens Tachykinin-4 Proteins 0.000 claims description 15
- OKUGPJPKMAEJOE-UHFFFAOYSA-N S-propyl dipropylcarbamothioate Chemical compound CCCSC(=O)N(CCC)CCC OKUGPJPKMAEJOE-UHFFFAOYSA-N 0.000 claims description 15
- 102100039365 Tachykinin-4 Human genes 0.000 claims description 15
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- 230000005611 electricity Effects 0.000 claims description 3
- 230000001131 transforming effect Effects 0.000 abstract 2
- 238000006243 chemical reaction Methods 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
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- 238000005259 measurement Methods 0.000 description 1
- 238000004153 renaturation Methods 0.000 description 1
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Abstract
The utility model provides a high-voltage mistaken-detection protective universal meter. The universal meter is characterized in that: a composite reaction-type protective circuit is arranged in series between an input terminal and a multiway function transforming switch, the protective circuit comprises at least one PTC element and a low-voltage fuse element, wherein the PTC element responds quickly to a divided voltage, and is high-voltage resistant, and the low-voltage fuse element is connected in series with the PTC element and responds slowly to the divided voltage; a maximum overload current value of the PTC element is smaller than a set fuse current value of the low-voltage fuse; when a 600V and higher high-voltage is mistaken-detected by the input terminal, internal resistances of the high-voltage resistant PTC element are increased rapidly to prevent a loop current from being increased instantly, and most of the voltage is borne by the PTC element; and a small part of voltage is borne by the low-voltage fuse, and the low-voltage fuse is fused when the set fuse current value is reached and a power supply is shut off, thereby the PTC element is always kept within a range of the maximum overload current value and is prevented from exploding and being damaged due to an overload current, and the circuit arranged behind the multiway function transforming switch is protected at the same time. The high-voltage mistaken-detection protective universal meter of the utility model can be widely applied in the post-stage loop protection of current grade and battery grade of measuring instruments.
Description
Technical field
The utility model relates to the electronic surveying technical field of tools, specifically relates to a kind of composite reaction-type holding circuit that adopts and realizes the high universal electric meter of surveying protection of holding up.
Background technology
Current electron trade is released various protection devices, and comprising low-tension fuse FUSE, runback PTC, the difference of high molecular PTC self-healing fuse and bimetallic strip does not lie in can be from renaturation, but bimetallic strip just runback when fault still exists.When it moves, produce bigger voltage and fault that maybe damage equipment is reclosed.The high molecular PTC self-healing fuse can be in high resistance state always and be excluded until fault.And the application of these devices basically all is to use separately by its characteristic, but under the situation according to present up-to-date safety standard IEC61010-2-030:2010, instrument mistake survey >=600V during high pressure following potential safety hazard can take place:
1) the fuse response time fast inadequately, super-large current under the situation of circuit moment UHV (ultra-high voltage), can occur and impact and to cause blast and to burn out circuit board.
2) though the resettable fuse response time is fast, stop loop current to increase in can increase sharply when surveying high pressure self internal resistance of mistake.But when using separately,, protection is also brought potential safety hazard owing to himself receive the overload current restriction to cause self explosive fault.
The utility model content
The technical matters that the utility model will solve is: provide a kind of high universal electric meter height of surveying protection of holding up of composite reaction-type holding circuit realization that adopts to hold up the survey guard method; Under the prerequisite that satisfies safety standard IEC61010-2-030:2010; Utilize above protection device advantage separately to carry out tandem compound; Promptly use and connect, form the composite reaction-type holding circuit with common low pressure glass tube (or ceramic pipe) fuse from recovering PTC; When mistake is surveyed voltage and is higher than 600V; Utilize the effect of runback PTC and the characteristic of low-tension fuse FUSE; Produce compound dividing potential drop, current limliting and fusing reaction, fast cut-off circuit can be widely used in level loop protection behind instrument current gear, the battery shelves; The effectively damage of protection back level components and parts is with quality and the security performance of guaranteeing product.
The utility model also provides a kind of composite reaction-type holding circuit that adopts to realize that above-mentioned height holds up the universal electric meter of surveying guard method.
The utility model is to solve the problems of the technologies described above the technical scheme that is adopted to be:
A kind of high holding up surveyed the protection universal electric meter; It is characterized in that; Between its input terminal and multichannel function change-over switch; Be in series with a composite reaction-type holding circuit, this holding circuit is formed by at least one dividing potential drop response fast, high voltage bearing PTC (posistor) element and with the low-tension fuse element of the dividing potential drop low-response of its polyphone; And the maximum overload current value of PTC element is less than the setting blow-out current value of low-tension fuse; When the input terminal mistake was surveyed 600V and above high pressure, the internal resistance of high pressure resistant PTC element increased sharply and stops loop current moment increase, and divides and remove most of voltage; The low-tension fuse branch removes fraction voltage and when setting blow-out current value, fuses; Cut off the electricity supply; The PTC element is in the maximum overload range of current all the time and can explode or damages because of current overload, the while has also been protected the circuit that is arranged on after the multichannel function change-over switch.
Described composite reaction-type holding circuit is by connecting with low-tension fuse after the parallel connection of two high voltage bearing PTC elements again and forming; And the maximum overload current value of PTC element is all less than the setting blow-out current value of low-tension fuse, to increase the reliability of holding circuit.
Said PTC element is shared 2/3 voltage, and low-tension fuse is shared 1/3 voltage.
Described high pressure resistant PTC element is for recover PPTC certainly.
Circuit after the said multichannel function change-over switch is electric current shunting load circuit and battery shelves sensing lead loop.
The beneficial effect of the utility model is: the utility model utilizes high pressure resistant PTC and the low-tension fuse FUSE protection device advantage separately of recovering certainly to carry out tandem compound; Form the composite reaction-type holding circuit; Wherein utilize from recovering the PTC dividing potential drop response time soon, self internal resistance of can increasing sharply stops loop current moment to increase, and low-tension fuse has setting value current limliting fuse function; Remedied and recovered PTC certainly and receive the less restriction of overload current; Overcome the PTC element because of current overload causes the shortcoming of self explosive fault, made it more effectively to have avoided damaging the situation of circuit board and device, met fully under the situation of up-to-date safety standard IEC61010-2-030:2010 owing to maloperation; Can adopt low-tension fuse to realize defencive function; Significantly reduce manufacturing cost, improved reaction protection speed simultaneously, realized the comprehensive defencive function of universal electric meter product.
The utility model can be widely used in level loop protection behind instrument current gear, the battery shelves, and the effectively damage of protection back level components and parts is with quality and the security performance of guaranteeing product.
Description of drawings
Fig. 1 is the schematic block circuit diagram of the utility model;
Fig. 2 is the circuit theory synoptic diagram of the utility model embodiment.
Embodiment
Embodiment 1: referring to Fig. 1 and Fig. 2; A kind of high the holding up that present embodiment provides surveyed the protection universal electric meter; Between its input terminal and multichannel function change-over switch; Be in series with a composite reaction-type holding circuit, this holding circuit is formed by fast, the high voltage bearing PPTC element of dividing potential drop response and with the low-tension fuse F1 element of the dividing potential drop low-response of its polyphone; And the maximum overload current value of PPTC element is less than the setting blow-out current value of low-tension fuse F1; When the input terminal mistake was surveyed 600V and above high pressure, the internal resistance of high pressure resistant PPTC element increased sharply and stops loop current moment increase, and divides and remove most of voltage; Low-tension fuse F1 branch removes fraction voltage and when setting blow-out current value, fuses; Cut off the electricity supply; The PPTC element is in the maximum overload range of current all the time and can explode or damages because of current overload, the while has also been protected the circuit that is arranged on after the multichannel function change-over switch.
In the present embodiment; Described composite reaction-type holding circuit adopts by connecting with low-tension fuse F1 after the parallel connection of two high voltage bearing PPTC elements again and forming; And the maximum overload current value of PPTC element is all less than the setting blow-out current value of low-tension fuse F1, to increase the reliability of holding circuit.In other embodiments, also can adopt the PPTC element more than or two to form holding circuit as required.
Said PTC element is shared 2/3 voltage, and low-tension fuse is shared 1/3 voltage; Described high pressure resistant PTC element is for recover PPTC certainly.
In the present embodiment, that the PPTC element adopts is KT600-160B, and adopts two parallel connections, and its withstand voltage is 600V; The low-tension fuse F 1 that adopts is the fuse of FF0.2-0.5AH/250V.
Circuit after the said multichannel function change-over switch is electric current shunting load circuit and battery shelves sensing lead loop.
Because from about 3.5 Ω of the initial internal resistance of recovering the PPTC element (with the KT600-160Bx2 example), and about 1 Ω of the internal resistance of low-tension fuse, when receiving the 600V impacting with high pressure; Two ends of low-tension fuse have only born about 1/3 voltage 171V; Remaining 2/3 429V voltage bears by recovering PPTC certainly entirely, so as long as select for use the low-tension fuse that recovers PPTC element and ability 250V certainly of ability 600V just can satisfy the requirement of safety CAT III 600V, if not like this; When adopting fuse merely; Then need adopt tolerance 600V high pressure and big fusing current, its reaction velocity is comparatively slow, and the protection effect is bad.
The scheme that the utility model provides greatly reduces design cost: former safety standard requires μ A/mA current gear and 1.5V/9V battery measurement shelves with 0.5A/700V (
x32mm) fuse; About 11.20 yuan of price; And use 0.5A/250
20mm now) x2 of fuse+(KT600-160B) is from recovering PPTC; About 3.00 yuan of package price; Practice thrift nearly 2/3 cost, and reached beyond thought technique effect.
1) guard method that provides of the utility model and product can satisfy each item technical indicator of product under basic WV condition;
2) utilization is carried out tandem compound from recovering PTC and low-tension fuse FUSE protection device advantage separately, realizes the comprehensive defencive function of product;
3) obtain satisfied test result through the theory and practice proof, can either satisfy the safety requirement, can practice thrift cost of products again.
The creationary characteristics separately of utilizing the resource of hardware of the utility model; Be implemented in rapid reaction and the multifunction protection of accomplishing product under the condition cheaply; Particularly use plain edition low-tension fuse FUSE product, realized the protection of the multichannel function of universal electric meter.The protection of also applicable any other instrument or electronic circuit.
The utility model is not limited to above-mentioned embodiment, and every employing and the utility model analog structure are realized all modes of the utility model purpose, all within the protection domain of the utility model.
Claims (5)
1. implement the universal electric meter that the said height of claim 1 is held up the survey guard method for one kind; It is characterized in that; Between its input terminal and multichannel function change-over switch; Be in series with a composite reaction-type holding circuit, this holding circuit is formed by at least one dividing potential drop fast, the high voltage bearing PTC element of response and with the low-tension fuse element of the dividing potential drop low-response of its polyphone; And the maximum overload current value of PTC element is less than the setting blow-out current value of low-tension fuse; When the input terminal mistake was surveyed 600V and above high pressure, the internal resistance of high pressure resistant PTC element increased sharply and stops loop current moment increase, and divides and remove most of voltage; The low-tension fuse branch removes fraction voltage and when setting blow-out current value, fuses; Cut off the electricity supply; The PTC element is in the maximum overload range of current all the time and can explode or damages because of current overload, the while has also been protected the circuit that is arranged on after the multichannel function change-over switch.
2. universal electric meter according to claim 1; It is characterized in that; Described composite reaction-type holding circuit is by connecting with low-tension fuse after the parallel connection of two high voltage bearing PTC elements again and forming; And the maximum overload current value of PTC element is all less than the setting blow-out current value of low-tension fuse, to increase the reliability of holding circuit.
3. universal electric meter according to claim 1 and 2 is characterized in that, said PTC element is shared 2/3 voltage, and low-tension fuse is shared 1/3 voltage.
4. universal electric meter according to claim 1 is characterized in that, described high pressure resistant PTC element is for recover PPTC certainly.
5. universal electric meter height according to claim 1 is held up the survey guard method, it is characterized in that, the circuit after the said multichannel function change-over switch is electric current shunting load circuit and battery shelves sensing lead loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220054155 CN202494703U (en) | 2012-02-20 | 2012-02-20 | High-voltage mistaken-detection protective universal meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220054155 CN202494703U (en) | 2012-02-20 | 2012-02-20 | High-voltage mistaken-detection protective universal meter |
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| Publication Number | Publication Date |
|---|---|
| CN202494703U true CN202494703U (en) | 2012-10-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220054155 Expired - Lifetime CN202494703U (en) | 2012-02-20 | 2012-02-20 | High-voltage mistaken-detection protective universal meter |
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| CN (1) | CN202494703U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102570389A (en) * | 2012-02-20 | 2012-07-11 | 优利德科技(中国)有限公司 | High-voltage error detection protecting method of avometer and avometer |
-
2012
- 2012-02-20 CN CN 201220054155 patent/CN202494703U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102570389A (en) * | 2012-02-20 | 2012-07-11 | 优利德科技(中国)有限公司 | High-voltage error detection protecting method of avometer and avometer |
| CN102570389B (en) * | 2012-02-20 | 2015-04-29 | 优利德科技(中国)有限公司 | High-voltage error detection protecting method of avometer and avometer |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 523808 No. 6 industrial North Road, Songshan Lake high tech Industrial Development Zone, Dongguan, Guangdong Patentee after: Uno Technology (China) Limited by Share Ltd Address before: 523808 No. 6 industrial North Road, Songshan Lake high tech Industrial Development Zone, Dongguan, Guangdong Patentee before: Uni-Trend Technology (China) Co., Ltd. |
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| CP01 | Change in the name or title of a patent holder | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121017 |
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| CX01 | Expiry of patent term |