CN102570389B - High-voltage error detection protecting method of avometer and avometer - Google Patents
High-voltage error detection protecting method of avometer and avometer Download PDFInfo
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- CN102570389B CN102570389B CN201210037936.2A CN201210037936A CN102570389B CN 102570389 B CN102570389 B CN 102570389B CN 201210037936 A CN201210037936 A CN 201210037936A CN 102570389 B CN102570389 B CN 102570389B
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Abstract
The invention provides a high-voltage error detection protecting method of an avometer. The method is characterized by comprising the following steps that: 1) a composite reactive protecting circuit is connected in series between an input terminal and a multi-channel function switching switch, wherein the protecting circuit consists of at least one positive temperature coefficient (PTC) element and a low-voltage fuse element connected in series with the PTC element, the PTC element is quick in voltage division response and high voltage resistant, the low-voltage fuse element is slow in voltage division response, and the highest overload current value of the PTC element is less than the set fusing current value of a low-voltage fuse; and 2) when the input terminal mistakenly detects high voltage which is 600V or higher, the internal resistance of the PTC element is quickly increased to prevent instant increase of loop current and share a large part of voltage, the low-voltage fuse shares a small part of voltage and is fused when the set fuse current value is reached, and a power supply is cut off, so the PTC element is always in the highest overload current range and is not exploded or damaged by current overload, and a circuit arranged behind the multi-channel function switching switch is protected at the same time. The invention also provides the avometer for implementing the method.
Description
Technical field
The present invention relates to electrical measurement tools technical field, specifically relate to a kind of composite reaction-type protective circuit that adopts and realize highly holding up high the holding up of the universal meter surveying protection and surveying guard method and universal meter.
Background technology
Current electron trade releases various protection device, and comprising low-tension fuse FUSE, runback PTC, the difference of high molecular PTC self-healing fuse and bimetal leaf does not lie in can self-healing, and bimetal leaf just can runback when fault still exists.Produce larger voltage when its action and the fault of possibility damage equipment is reclosed.High molecular PTC self-healing fuse can be in high resistance state until fault is excluded always.And the application of these devices is substantially all be used alone by its characteristic, but when according to current up-to-date safety standard IEC61010-2-030:2010, when instrument misses survey >=600V high pressure, following potential safety hazard can be there is:
1) the fuse response time is fast not, there will be super-large current impact cause blast and burn out circuit board when circuit moment superhigh pressure.
2) although the resettable fuse response time is fast, self internal resistance that can increase sharply when surveying high pressure by mistake increases to stop loop current.But when being used alone because himself causes self explosive fault by overload current restriction, also potential safety hazard is brought to protection.
Summary of the invention
The technical problem to be solved in the present invention is: provide a kind of and adopt composite reaction-type protective circuit to realize the high universal meter surveying protection of holding up highly to hold up survey guard method, under the prerequisite meeting safety standard IEC61010-2-030:2010, above protection device advantage is separately utilized to carry out tandem compound, namely use self-recoverage PTC to connect with pressure common glass tube (or earthenware) fuse, form composite reaction-type protective circuit; When surveying voltage higher than 600V by mistake; 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; instrument current gear, battery shelves rear class loop protection can be widely used in; the damage of available protecting rear class components and parts, to guarantee quality and the security performance of product.
The present invention also provides a kind of and adopts composite reaction-type protective circuit to realize above-mentioned height to hold up and survey the universal meter of guard method.
The present invention for solving the problems of the technologies described above adopted technical scheme is:
A kind of universal meter is high holds up survey guard method, and it is characterized in that, it comprises the steps:
1) between input terminal and multichannel function diverter switch, connect a composite reaction-type protective circuit, this protective circuit responds fast, high voltage bearing PTC (semistor) element by least one dividing potential drop and forms with the low-tension fuse element of the dividing potential drop low-response of its series winding; And the maximum overload current value of PTC element is less than the setting blow-out current value of low-tension fuse.
2) when input terminal surveys 600V and above high pressure by mistake, the internal resistance of high pressure resistant PTC element increases sharply and stops loop current to increase instantaneously, and point removes most of voltage; Low-tension fuse divides fraction voltage and fuses when setting blow-out current value; cut off the electricity supply; make PTC element be in all the time in maximum overload current range and can not explode because of current overload or damage, also protect the circuit after being arranged on multichannel function diverter switch simultaneously.
Described step 1) described in composite reaction-type protective circuit; connect with low-tension fuse again after the high voltage bearing PTC element in parallel of employing two and formed; 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 protective circuit.
Described step 2) in, the voltage of 2/3 shared by PTC element, and 1/3 voltage shared by low-tension fuse.
Described high pressure resistant PTC element is self-recoverage PPTC.
Circuit after described multichannel function diverter switch is current distributing load circuit and battery shelves sensing lead loop.
A kind ofly implement aforementioned height and hold up and survey the universal meter of guard method, it is characterized in that, between its input terminal and multichannel function diverter switch, be in series with a composite reaction-type protective circuit, this protective circuit responds fast, high voltage bearing PTC element by least one dividing potential drop and forms with the low-tension fuse element of the dividing potential drop low-response of its series winding; And the maximum overload current value of PTC element is less than the setting blow-out current value of low-tension fuse; When input terminal surveys 600V and above high pressure by mistake, the internal resistance of high pressure resistant PTC element increases sharply and stops loop current to increase instantaneously, and point removes most of voltage; Low-tension fuse divides fraction voltage and fuses when setting blow-out current value; cut off the electricity supply; make PTC element be in all the time in maximum overload current range and can not explode because of current overload or damage, also protect the circuit after being arranged on multichannel function diverter switch simultaneously.
Described composite reaction-type protective circuit is formed by connecting with low-tension fuse after two high voltage bearing PTC element in parallel again; 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 protective circuit.
The voltage of 2/3 shared by described PTC element, and 1/3 voltage shared by low-tension fuse.
Described high pressure resistant PTC element is self-recoverage PPTC.
Circuit after described multichannel function diverter switch is current distributing load circuit and battery shelves sensing lead loop.
Beneficial effect of the present invention is: the present invention utilizes high pressure resistant self-recoverage PTC and low-tension fuse FUSE protection device advantage separately to carry out tandem compound, form composite reaction-type protective circuit, wherein utilize the self-recoverage PTC dividing potential drop response time fast, self internal resistance that can increase sharply increases instantaneously to stop loop current, and low-tension fuse has set point current limliting fuse function, compensate for self-recoverage PTC and be subject to the restriction that overload current is less, overcome PTC element causes self explosive fault shortcoming because of current overload, make it more effectively to avoid the situation damaging circuit board and device due to misoperation, when meeting up-to-date safety standard IEC61010-2-030:2010 completely, low-tension fuse can be adopted to realize defencive function, significantly reduce manufacturing cost, improve reaction protection speed simultaneously, realize the comprehensive defencive function of universal meter product.
The present invention can be widely used in instrument current gear, battery shelves rear class loop protection, the damage of available protecting rear class components and parts, to guarantee quality and the security performance of product.
Accompanying drawing explanation
Fig. 1 is schematic block circuit diagram of the present invention;
Fig. 2 is the circuit theory schematic diagram of the embodiment of the present invention.
Embodiment
Embodiment 1: see Fig. 1 and Fig. 2, a kind of universal meter that the present embodiment provides is high holds up survey guard method, and it comprises the steps:
1) between input terminal and multichannel function diverter switch, connect a composite reaction-type protective circuit, this protective circuit responds fast, high voltage bearing PTC (semistor) element PPTCA/B by two dividing potential drops and forms with the low-tension fuse element F1 of the dividing potential drop low-response of its series winding; And the maximum overload current value of PPTC A/B element is less than the setting blow-out current value of low-tension fuse F1; In the present embodiment, that PPTC element adopts is KT600-160B, and adopts two parallel connections, and its withstand voltage is 600V; The low-tension fuse F1 adopted is the fuse of FF0.2-0.5AH/250V;
2) when input terminal surveys 600V and above high pressure by mistake, the internal resistance of high pressure resistant PPTC element increases sharply and stops loop current to increase instantaneously, and point removes most of voltage; Low-tension fuse divides fraction voltage and fuses when setting blow-out current value; cut off the electricity supply; make PPTC element be in all the time in maximum overload current range and can not explode because of current overload or damage, also protect the circuit after being arranged on multichannel function diverter switch simultaneously.
In the present embodiment, described step 1) described in composite reaction-type protective circuit, connect with low-tension fuse again after the high voltage bearing PPTC element in parallel of employing two and formed, and the maximum overload current value of PPTC element is all less than the setting blow-out current value of low-tension fuse, to increase the reliability of protective circuit; In other embodiments, also can adopt the PPTC element composition protective circuit of more than or two as required.
Described step 2) in, the voltage of about 2/3 shared by PPTC element, and about 1/3 voltage shared by low-tension fuse.
Described high pressure resistant PTC element is self-recoverage PPTC, i.e. macromolecular positive temperature coefficient thermosensitive resistor or fuse.
Circuit after described multichannel function diverter switch, is current distributing load circuit and battery shelves sensing lead loop, according to actual needs, can also comprises other functional circuits.
A kind ofly implement aforementioned height and hold up and survey the universal meter of guard method, between its input terminal and multichannel function diverter switch, be in series with a composite reaction-type protective circuit, this protective circuit responds fast, high voltage bearing PPTC element by dividing potential drop and forms with the low-tension fuse F1 element of the dividing potential drop low-response of its series winding; And the maximum overload current value of PPTC element is less than the setting blow-out current value of low-tension fuse F1; When input terminal surveys 600V and above high pressure by mistake, the internal resistance of high pressure resistant PPTC element increases sharply and stops loop current to increase instantaneously, and point removes most of voltage; Low-tension fuse F1 divides fraction voltage and fuses when setting blow-out current value; cut off the electricity supply; make PPTC element be in all the time in maximum overload current range and can not explode because of current overload or damage, also protect the circuit after being arranged on multichannel function diverter switch simultaneously.
In the present embodiment; described composite reaction-type protective circuit adopts and is formed by connecting with low-tension fuse F1 after two high voltage bearing PPTC element in parallel again; and the maximum overload current value of PPTC element is all less than the setting blow-out current value of low-tension fuse F 1, to increase the reliability of protective circuit.In other embodiments, the PPTC element composition protective circuit of more than or two can also be adopted as required.
The voltage of 2/3 shared by described PTC element, and 1/3 voltage shared by low-tension fuse; Described high pressure resistant PTC element is self-recoverage PPTC.
In the present embodiment, that PPTC element adopts is KT600-160B, and adopts two parallel connections, and its withstand voltage is 600V; The low-tension fuse F1 adopted is the fuse of FF0.2-0.5AH/250V.
Circuit after described multichannel function diverter switch is current distributing load circuit and battery shelves sensing lead loop.
Due to initial internal resistance (with KT600-160Bx2 example) about 3.5 Ω of self-recoverage PPTC element, and the internal resistance of low-tension fuse about 1 Ω, when being subject to 600V impacting with high pressure, two ends of low-tension fuse only bear the voltage 171V of about 1/3, the 429V voltage of remaining 2/3 is born by self-recoverage PPTC entirely, as long as so select the self-recoverage PPTC element of ability 600V and the low-tension fuse of ability 250V just can meet require that of safety CAT III 600V, if not like this, during simple employing fuse, then need to adopt tolerance 600V high pressure and large blowout current, its reaction speed is comparatively slow, protected effect is bad.
Method provided by the invention and product, greatly reduce design cost: former safety standard requirement μ A/mA current gear and 1.5V/9V battery measurement shelves 0.5A/700V
fuse, price about 11.20 yuan, and use 0.5A/250 now
fuse+(KT600-160B) x2 self-recoverage PPTC, package price about 3.00 yuan, has saved the cost of nearly 2/3, and has reached beyond thought technique effect.
1) guard method provided by the invention and product are under basic operating voltage condition, can meet all technical of product;
2) utilize self-recoverage PTC and low-tension fuse FUSE protection device advantage separately to carry out tandem compound, realize the comprehensive defencive function of product;
3) prove to have obtained satisfied test result through theory and practice, safety requirement can either be met, can product cost be saved again.
The features utilizing the resource of hardware of the invention, realizes under the condition of low cost, complete product fast reaction and multifunction protection, particularly uses plain edition low-tension fuse FUSE product, achieves the protection of the multichannel function of universal meter.Also the protection of applicable other instrument any or electronic circuit.
The present invention is not limited to above-mentioned execution mode, and every employing and similarity method of the present invention and structure realize all modes of the object of the invention, all within protection scope of the present invention.
Claims (4)
1. universal meter is high holds up a survey guard method, and it is characterized in that, it comprises the steps:
1) between input terminal and multichannel function diverter switch, a composite reaction-type protective circuit of connecting, this protective circuit responds fast, high voltage bearing PTC element by least one dividing potential drop and forms with the low-tension fuse element of the dividing potential drop low-response of its series winding; And the maximum overload current value of PTC element is greater than the setting blow-out current value of low-tension fuse; Described composite reaction-type protective circuit, connect with low-tension fuse again after the high voltage bearing PTC element in parallel of employing two and formed, and the maximum overload current value of PTC element is all greater than the setting blow-out current value of low-tension fuse, to increase the reliability of protective circuit;
2) when input terminal surveys 600V and above high pressure by mistake, the internal resistance of high pressure resistant PTC element increases sharply and stops loop current to increase instantaneously, and shares the voltage of 2/3; Low-tension fuse is shared 1/3 voltage and is fused when setting blow-out current value; cut off the electricity supply; PTC element is made to be in all the time in maximum overload current range and can not to explode because of current overload or damage; also protect the circuit after being arranged on multichannel function diverter switch simultaneously; circuit after described multichannel function diverter switch is current distributing load circuit and battery shelves sensing lead loop.
2. universal meter according to claim 1 is high holds up survey guard method, it is characterized in that, described high pressure resistant PTC element is self-recoverage PPTC.
3. one kind implements the claims high universal meter of holding up survey guard method described in 1, it is characterized in that, between its input terminal and multichannel function diverter switch, be in series with a composite reaction-type protective circuit, this protective circuit responds fast, high voltage bearing PTC element by least one dividing potential drop and forms with the low-tension fuse element of the dividing potential drop low-response of its series winding; And the maximum overload current value of PTC element is greater than the setting blow-out current value of low-tension fuse; When input terminal surveys 600V and above high pressure by mistake, the internal resistance of high pressure resistant PTC element increases sharply and stops loop current to increase instantaneously, and shares the voltage of 2/3; Low-tension fuse is shared 1/3 voltage and is fused when setting blow-out current value, cut off the electricity supply, make PTC element be in all the time in maximum overload current range and can not explode because of current overload or damage, also protect the circuit after being arranged on multichannel function diverter switch simultaneously; Described composite reaction-type protective circuit is formed by connecting with low-tension fuse after two high voltage bearing PTC element in parallel again, and the maximum overload current value of PTC element is all greater than the setting blow-out current value of low-tension fuse, to increase the reliability of protective circuit; Circuit after described multichannel function diverter switch is current distributing load circuit and battery shelves sensing lead loop.
4. universal meter according to claim 3, is characterized in that, described high pressure resistant PTC element, is self-recoverage PPTC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210037936.2A CN102570389B (en) | 2012-02-20 | 2012-02-20 | High-voltage error detection protecting method of avometer and avometer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210037936.2A CN102570389B (en) | 2012-02-20 | 2012-02-20 | High-voltage error detection protecting method of avometer and avometer |
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| Publication Number | Publication Date |
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| CN102570389A CN102570389A (en) | 2012-07-11 |
| CN102570389B true CN102570389B (en) | 2015-04-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210037936.2A Active CN102570389B (en) | 2012-02-20 | 2012-02-20 | High-voltage error detection protecting method of avometer and avometer |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106405432A (en) * | 2016-11-04 | 2017-02-15 | 优利德科技(中国)有限公司 | Multi-state battery power monitoring method and monitoring instrument |
| CN110299744B (en) * | 2019-07-08 | 2021-12-10 | 阳光电源股份有限公司 | High-voltage battery cluster and overcurrent protection circuit and switch box thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2331973Y (en) * | 1998-07-15 | 1999-08-04 | 陈泰源 | Device for protecting three-use watt-hour meter burnout when mistake detection |
| CN202494703U (en) * | 2012-02-20 | 2012-10-17 | 优利德科技(中国)有限公司 | High-voltage mistaken-detection protective universal meter |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001327068A (en) * | 2000-05-12 | 2001-11-22 | Mitsubishi Cable Ind Ltd | Protective device for wiring system of vehicle |
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- 2012-02-20 CN CN201210037936.2A patent/CN102570389B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2331973Y (en) * | 1998-07-15 | 1999-08-04 | 陈泰源 | Device for protecting three-use watt-hour meter burnout when mistake detection |
| CN202494703U (en) * | 2012-02-20 | 2012-10-17 | 优利德科技(中国)有限公司 | High-voltage mistaken-detection protective universal meter |
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| CN102570389A (en) | 2012-07-11 |
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Address after: 523808, No. 6, industrial North Road, Songshan hi tech Industrial Development Zone, Guangdong, Dongguan Applicant after: Uni-Trend Technology (China) Co., Ltd. Address before: 523925, Humen Town, Guangdong, Dongguan Applicant before: Uni-Trend Technology (China) Co., Ltd. |
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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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