CN208238977U - A kind of connecting terminal overheating detection circuit and single-phase charge-controlled intelligent electric meter - Google Patents
A kind of connecting terminal overheating detection circuit and single-phase charge-controlled intelligent electric meter Download PDFInfo
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- CN208238977U CN208238977U CN201820503194.0U CN201820503194U CN208238977U CN 208238977 U CN208238977 U CN 208238977U CN 201820503194 U CN201820503194 U CN 201820503194U CN 208238977 U CN208238977 U CN 208238977U
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Abstract
A kind of connecting terminal overheating detection circuit and single-phase charge-controlled intelligent electric meter, belong to electrical energy measurement field, solve the problems, such as existing for existing single-phase charge-controlled intelligent electric meter: since connecting terminal has superheating phenomenon will cause, electric energy meter is scrapped, even initiation fire causes economic loss.The connecting terminal overheating detection circuit includes: integrated circuit, two thermistors, six resistance, diodes.Temperature acquisition is completed by two thermistors, the conversion of temperature to voltage is completed by first resistor, second resistance, the setting of reference voltage is completed by first resistor, second resistance, 6th resistance is the pull-up resistor that two voltage comparators share, unidirectional return difference function is completed by the 5th resistance, diode, the comparison of two-way voltage is completed by integrated circuit.It is the configuration of the present invention is simple, reliable operation, low in cost, it can effectively eliminate economic loss and fire risk caused by connecting terminal overheat, protection electric energy meter is without damage.
Description
Technical field
The utility model belongs to Electric Energy Metering Technology field, and in particular to a kind of connecting terminal overheating detection circuit and single-phase
Take control intelligent electric energy meter.
Background technique
Low-voltage customer metering at present generallys use single-phase charge-controlled intelligent electric meter, have in this electric energy meter magnetic keep after
Electric appliance can remotely be stopped, operation of sending a telegram in reply according to demand charge surplus situation.
Due to many reasons, superheating phenomenon can occur for this connection box of electric energy meter terminal.If cannot find and handle in time,
Connecting terminal and watchcase can be burned out, and electric energy meter is caused to scrap.Connecting terminal overheat can also cause fire sometimes, and fire can be whole
Electric energy meter is burnt in a electricity box.According to statistics, certain county has 1,000 muti-piece single-phase electric energy meters to burn since connecting terminal overheats every year,
Annual economic loss hundreds of thousands member.
After electric energy meter damage, electricity is caused to lose, electric quantity compensating is also more troublesome.Contain in addition, these scrap electric energy meter
The poisonous and harmful heavy metallics such as lead, tin, become after electronic waste can also contaminated soil and water source, destroy resource and environment.
Utility model content
In order to solve existing for existing single-phase charge-controlled intelligent electric meter: since connecting terminal has superheating phenomenon to will cause electric energy
Statistical tables and reports are useless, even cause the problem of fire causes economic loss, and the utility model provides a kind of connecting terminal overheating detection circuit
And single-phase charge-controlled intelligent electric meter.
Used technical solution is as follows in order to solve the technical problem for the utility model:
A kind of connecting terminal overheating detection circuit of the utility model, comprising: integrated circuit, the first thermistor, second
Thermistor, first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, diode；
4. described first resistor one end, second resistance one end, the 4th resistance one end, integrated circuit foot connect with 3.3V cathode
It connects；
First thermistor one end, second thermistor one end, 3rd resistor one end, integrated circuit foot 8., the 6th
Resistance one end is connect with 3.3V anode；
2. the first thermistor other end, the first resistor other end are connect with integrated circuit foot；
6. the second thermistor other end, the second resistance other end are connect with integrated circuit foot；
The 3rd resistor other end, the 4th resistance other end, integrated circuit foot 3., integrated circuit foot 5., the 5th resistance
One end connection；
The 6th resistance other end, diode cathode, integrated circuit foot 1., integrated circuit foot 7. with output end OUT
Connection；
The 5th resistance other end is connect with diode cathode.
Further, the integrated circuit uses LM393P, and the first thermistor and the second thermistor are all made of
NTC100k, first resistor, second resistance and the 4th resistance are all made of 12k1/16W, and 3rd resistor uses 36k1/16W, the 5th electricity
Resistance uses 8.2k1/16W, and the 6th resistance uses 4.7k1/16W, and diode uses M1.
Further, default hole in the insulator between two pair of wire connection terminals of single-phase charge-controlled intelligent electric meter,
Two thermistors are respectively corresponded and are mounted in hole.
Further, it is examined using the overheat that two hysteresis voltage comparators in integrated circuit complete two o'clock connecting terminal
It surveys.
Further, by adjusting the resistance value pair of wire connection terminals overheat power-off temperature of 3rd resistor, the 4th resistance, the 5th resistance
Degree and telegram in reply temperature are adjusted, and guarantee to be independent of each other in adjustment power-off temperature and telegram in reply temperature.
Further, temperature acquisition is completed by the first thermistor, the second thermistor, passes through first resistor, second
Resistance completes the conversion of temperature to voltage, and the setting of reference voltage is completed by first resistor, second resistance, and the 6th resistance is two
The shared pull-up resistor of a voltage comparator completes unidirectional return difference function by the 5th resistance, diode, complete by integrated circuit
At the comparison of two-way voltage.
Further, when detection, when two acquisition point temperatures on connecting terminal below power off temperature, X point, Y point
Current potential is below B point reference potential, and two voltage comparator homophase input terminal potentials in integrated circuit are all higher than anti-phase input
Terminal potential, two voltage comparator output ends all end, and detection circuit exports high potential, at this point, diode, the 5th resistance feedback
Branch conducting, B point reference potential are elevated, and form unidirectional return difference；
When any acquisition point temperature on connecting terminal is all higher than power-off temperature, X point or Y point current potential are higher than B point benchmark
Current potential, corresponding voltage comparator homophase input terminal potential are lower than anti-phase input terminal potential, output end saturation conduction, detection circuit
Low potential is exported, at this point, diode, the 5th resistance feedback branch end, B point reference potential is only by 3rd resistor, the 4th resistance
It determines, there is no return differences.
Further, when detection, when connecting terminal temperature falls back to telegram in reply temperature, X point or Y point current potential are lower than B point base
Quasi- current potential, corresponding voltage comparator homophase input terminal potential are higher than anti-phase input terminal potential, and output end ends, and detection circuit is defeated
High potential out, at this point, diode, the 5th resistance feedback branch are connected again, B point reference potential is elevated again, is formed again single
To return difference.
The utility model additionally provides a kind of single-phase charge-controlled intelligent electric meter with connecting terminal overheating protection function, main
If being realized using above-mentioned connecting terminal overheating detection circuit.
Further, a kind of single-phase cost-control intelligent electric energy with connecting terminal overheating protection function of the utility model
Table, further includes:
The microprocessor being connected with connecting terminal overheating detection circuit；
Liquid crystal display, indicator light, driving circuit, the key being connected with microprocessor；
The magnetic latching relay being connected with driving circuit；
Terminal temperature alarm is issued by indicator light or is sent out by adding terminal overheat identifier mode on liquid crystal display
Terminal temperature alarm out；
When the temperature of any temperature sampling point is more than power-off temperature on connecting terminal, the output of connecting terminal overheating detection circuit
Low potential, microprocessor issue instruction, control magnetic latching relay separating brake by driving circuit, electric energy meter load is removed, connects
Line terminals temperature rise is limited, and electric energy meter is protected；Indicator light issues the terminal on alarm or liquid crystal display and overheats mark at this time
Symbol shows, and concentrator, user power utilization information acquisition system acquisition connecting terminal cross thermal information；
When connecting terminal temperature falls back to telegram in reply temperature, connecting terminal overheating detection circuit exports high potential, microprocessor
Instruction is issued, is closed a floodgate by driving circuit magnetic latching relay, electric energy meter load is switched on；In order to be conducive to defect management, terminal
Temperature alarm is manually released by existing key.
The beneficial effects of the utility model are: the connecting terminal overheating detection circuit of the utility model, mainly by integrated electricity
Road IC, 2 thermistors, 6 resistance and diode composition, structure is simple, reliable operation, low in cost.
The single-phase charge-controlled intelligent electric meter of the utility model takes full advantage of the existing money of single-phase charge-controlled intelligent electric meter
Source increases connecting terminal overheating detection circuit newly, can effectively eliminate economic loss and fire wind caused by connecting terminal overheat
Danger, protection electric energy meter are without damage.
Detailed description of the invention
Fig. 1 is connecting terminal overheating detection circuit figure.
Fig. 2 is the structure composition block diagram of the single-phase charge-controlled intelligent electric meter of the utility model.
In figure: IC, integrated circuit, RT1, the first thermistor, RT2, the second thermistor, R1~R6, first resistor~
6th resistance, D, diode.
Specific embodiment
The utility model is described in further detail below in conjunction with attached drawing.
As shown in Figure 1, a kind of connecting terminal overheating detection circuit of the utility model, specifically includes that Integrated circuit IC,
One thermistor RT1, the second thermistor RT2, first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4,
Five resistance R5, the 6th resistance R6, diode D.
The one end first resistor R1, the one end second resistance R2, the 4th one end resistance R4, Integrated circuit IC foot are 4. negative with 3.3V
Pole connection.First one end thermistor RT1, second one end thermistor RT2, the one end 3rd resistor R3, Integrated circuit IC foot 8.,
6th one end resistance R6 is connect with 3.3V anode.The first thermistor RT1 other end, the first resistor R1 other end with it is integrated
2. IC circuit foot connects.6. the second thermistor RT2 other end, the second resistance R2 other end are connect with Integrated circuit IC foot.
The 3rd resistor R3 other end, the 4th resistance R4 other end, Integrated circuit IC foot 3., Integrated circuit IC foot 5., the 5th resistance R5 mono-
End connection, i.e., 3. the 3rd resistor R3 other end, the 4th resistance R4 other end, the 5th one end resistance R5 connect with Integrated circuit IC foot
It connects, meanwhile, 5. the 3rd resistor R3 other end, the 4th resistance R4 other end, the 5th one end resistance R5 connect with Integrated circuit IC foot
It connects.The 6th resistance R6 other end, diode D anode, Integrated circuit IC foot are 1., 7. Integrated circuit IC foot connects with output end OUT
It connects.The 5th resistance R5 other end is connect with diode D cathode.
Hole, the first thermistor are preset in insulator between single-phase charge-controlled intelligent electric meter connecting terminal 1 and 2
RT1 is installed in this hole.Meanwhile preset hole in the insulator between single-phase charge-controlled intelligent electric meter connecting terminal 3 and 4
Hole, the second thermistor RT2 are installed in this hole.
A kind of single-phase charge-controlled intelligent electric meter with connecting terminal overheating protection function of the utility model, is mainly adopted
It is realized with above-mentioned connecting terminal overheating detection circuit.As shown in Fig. 2, the single-phase charge-controlled intelligent electric meter is specifically included that and is connect
Line terminals overheating detection circuit, microprocessor, driving circuit, magnetic latching relay, liquid crystal display, indicator light, key.Connecting terminal
Overheating detection circuit is connect with microprocessor, that is, connecting terminal overheating detection circuit 3.3V anode, 3.3V cathode with
Microprocessor is connected.Liquid crystal display, indicator light, driving circuit, key are connected with microprocessor, magnetic latching relay and driving electricity
Road is connected.
Microprocessor therein, driving circuit, magnetic latching relay, liquid crystal display, indicator light, key are the prior art,
That is, connecting terminal overheating detection circuit is devised on the basis of existing single-phase charge-controlled intelligent electric meter structure composition,
And the connecting terminal overheating detection circuit is applied to the overheating detection that connecting terminal is realized on single-phase charge-controlled intelligent electric meter.
Terminal temperature alarm is issued using indicator light, or is sent out by adding terminal overheat identifier mode on liquid crystal display
Out.Terminal temperature alarm can also upload in concentrator and user power utilization information acquisition system.
When the temperature of any temperature sampling point is more than power-off temperature on connecting terminal, the output of connecting terminal overheating detection circuit
Low potential, microprocessor issue instruction, control magnetic latching relay separating brake by driving circuit, electric energy meter load is removed, connects
Line terminals temperature rise is limited, and electric energy meter is protected.Electric energy meter indicator light issues the terminal mistake on alarm or liquid crystal display at this time
Hot identifier shows, and concentrator, user power utilization information acquisition system acquisition connecting terminal cross thermal information.
When connecting terminal temperature falls back to telegram in reply temperature, connecting terminal overheating detection circuit exports high potential, microprocessor
Instruction is issued, is closed a floodgate by driving circuit magnetic latching relay, electric energy meter load is switched on.In order to be conducive to defect management, terminal
Temperature alarm is manually released by existing key.
Two o'clock connecting terminal overheating detection is completed using two hysteresis voltage comparators in Integrated circuit IC.Connecting terminal
Overheat power-off temperature is about 80 DEG C, and telegram in reply temperature is about 50 DEG C, can modify 3rd resistor R3, the 4th resistance R4, the 5th resistance
The resistance value of R5 is adjusted, and adjustment can be accomplished to be independent of each other when powering off temperature and telegram in reply temperature.
When detection, temperature acquisition is completed by the first thermistor RT1, the second thermistor RT2, passes through first resistor
R1, second resistance R2 complete the conversion of temperature to voltage, complete setting for reference voltage by first resistor R1, second resistance R2
It sets, the 6th resistance R6 is the pull-up resistor that two voltage comparators share, and completes unidirectional return by the 5th resistance R5, diode D
Poor function completes the comparison of two-way voltage by Integrated circuit IC.
Step 1: circuit is connected, and when two acquisition point temperatures on connecting terminal below power off temperature, X point, Y point
Current potential is below B point reference potential, and it is defeated that two voltage comparator homophase input terminal potentials in Integrated circuit IC are all higher than reverse phase
Enter terminal potential, two voltage comparator output ends all end, and detection circuit exports high potential.At this point, diode D, the 5th resistance
The conducting of R5 feedback branch, B point reference potential are elevated, and form unidirectional return difference.When any acquisition point temperature is all higher than power-off temperature
When, X point or Y point current potential are higher than B point reference potential, and corresponding voltage comparator homophase input terminal potential is lower than inverting input terminal electricity
Position, output end saturation conduction, detection circuit export low potential.At this point, diode D, the 5th resistance R5 feedback branch end, B
Point reference potential is only determined that there is no return differences by 3rd resistor R3, the 4th resistance R4.
Step 2: X point or Y point current potential are lower than B point reference potential, right when connecting terminal temperature falls back to telegram in reply temperature
Voltage comparator homophase input terminal potential is answered to be higher than anti-phase input terminal potential, output end cut-off, detection circuit exports high potential.
At this point, diode D, the 5th resistance R5 feedback branch are connected again, B point reference potential is elevated again, forms unidirectional return difference again.
The setting process of temperature is as follows:
In typical hysteresis voltage comparator circuit, the 5th resistance R5 is connected directly across hysteresis voltage comparator output end
And input terminal, not series diode D.If the setting of power-off temperature and telegram in reply temperature are set using typical hysteresis voltage comparator
It is both fixed to interact, it calculates also more complicated.After the utility model increases diode D in feedback branch, power-off temperature is set
Fixed and telegram in reply temperature setting just respectively it is independent, be independent of each other, while calculating and being greatly simplified.After increasing diode D, power-off temperature
Degree setting is completed by the 5th resistance R5, and telegram in reply temperature setting is completed by 3rd resistor R3, can be according to connecting terminal, watchcase material
The factors such as tolerance high temperature capabilities are adjusted.Based on hysteresis voltage comparator input resistance in Ω grades of this features of M, 3rd resistor
Steps are as follows for the selection of R3, the 5th resistance R5:
1, power-off desired temperature and telegram in reply desired temperature are determined.Powering off desired temperature is 80 DEG C, and telegram in reply temperature is set
Definite value is 50 DEG C.
2, the temperature resistance value table of comparisons that inquiry producer provides, thermistor NTC100k resistance value are 35.880k at 50 DEG C
Ω is 12.236k Ω at 80 DEG C.
3,3rd resistor R3 is determined.For connecting terminal temperature at 50 DEG C of setting value of telegram in reply, X, Y two o'clock current potential are UX50=
UY50=R1U/ (R1+RT1)=R2U/ (R2+RT2)=0.827V.In order to make hysteresis voltage comparator output state from low level
Become high level, B point current potential should be approximately equal to X, Y two o'clock current potential.Off state and the 4th resistance are according to diode D
R4,3rd resistor R3 partial pressure relationship, 3rd resistor R3=R4/ (U-UB)/UB, 3rd resistor R3 should select 36k Ω.
4, the 5th resistance R5 is determined.When connecting terminal temperature reaches 80 DEG C of setting value of power-off, X, Y two o'clock current potential are UX80=
UY80=R1U/ (R1+RT1)=R2U/ (R2+RT2)=1.634V.In order to make hysteresis voltage comparator output state from high level
Become low level, B point current potential should be approximately equal to X, Y two o'clock current potential.The electric current for flowing through the 4th resistance R4 is IR4=UB/R4=
0.136mA, the electric current for flowing through 3rd resistor R3 is IR3=(U-UB)/R3=0.046mA.It is in the conductive state according to diode D
And node current law, the electric current for flowing through the 5th resistance R5 is IR5=IR4-IR3=0.09mA.Due to flowing through diode D's
Electric current very little, diode D forward voltage drop can take 0.5V.It is possible thereby to find out the 5th resistance R5 should be R5=(U-UB-0.5)/
IR5-R6, the 5th resistance R5 should select 8.2k Ω.
In present embodiment, Integrated circuit IC specifically uses LM393P, the first thermistor RT1 and the second thermistor
RT2 is specifically all made of NTC100k, and first resistor R1, second resistance R2 and the 4th resistance R4 are specifically all made of 12k1/16W, third
Resistance R3 specifically uses 36k1/16W, the 5th resistance R5 that 8.2k1/16W, the 6th resistance R6 is specifically used specifically to use 4.7k1/
16W, diode D specifically use M1.
The above is only the preferred embodiment of the utility model, it is noted that for the common skill of the art
For art personnel, without departing from the principle of this utility model, several improvements and modifications can also be made, these improve and
Retouching also should be regarded as the protection scope of the utility model.
Claims (10)
1. a kind of connecting terminal overheating detection circuit characterized by comprising integrated circuit, the first thermistor, the second temperature-sensitive
Resistance, first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, diode；
4. described first resistor one end, second resistance one end, the 4th resistance one end, integrated circuit foot are connect with 3.3V cathode；
First thermistor one end, second thermistor one end, 3rd resistor one end, integrated circuit foot 8., the 6th resistance
One end is connect with 3.3V anode；
2. the first thermistor other end, the first resistor other end are connect with integrated circuit foot；
6. the second thermistor other end, the second resistance other end are connect with integrated circuit foot；
The 3rd resistor other end, the 4th resistance other end, integrated circuit foot 3., integrated circuit foot 5., the 5th resistance one end
Connection；
The 6th resistance other end, diode cathode, integrated circuit foot are 1., 7. integrated circuit foot connect with output end OUT；
The 5th resistance other end is connect with diode cathode.
2. a kind of connecting terminal overheating detection circuit according to claim 1, which is characterized in that the integrated circuit uses
LM393P, the first thermistor and the second thermistor are all made of NTC100k, and first resistor, second resistance and the 4th resistance are equal
Using 12k1/16W, 3rd resistor uses 36k1/16W, and the 5th resistance uses 8.2k1/16W, and the 6th resistance uses 4.7k1/
16W, diode use M1.
3. a kind of connecting terminal overheating detection circuit according to claim 1, which is characterized in that in single-phase cost-control intelligent electricity
Default hole, two thermistors are respectively corresponded and are mounted in hole in insulator between two pair of wire connection terminals of energy table.
4. a kind of connecting terminal overheating detection circuit according to claim 1, which is characterized in that using in integrated circuit
Two hysteresis voltage comparators complete the overheating detection of two o'clock connecting terminal.
5. a kind of connecting terminal overheating detection circuit according to claim 1, which is characterized in that by adjusting third electricity
Resistance, the resistance value pair of wire connection terminals overheat power-off temperature of the 4th resistance, the 5th resistance and telegram in reply temperature are adjusted, and guarantee adjusting
It is independent of each other when power-off temperature and telegram in reply temperature.
6. a kind of connecting terminal overheating detection circuit according to claim 1, which is characterized in that pass through the first temperature-sensitive electricity
Resistance, the second thermistor complete temperature acquisition, complete the conversion of temperature to voltage by first resistor, second resistance, pass through the
One resistance, second resistance complete the setting of reference voltage, and the 6th resistance is the pull-up resistor that two voltage comparators share, and pass through
5th resistance, diode complete unidirectional return difference function, and the comparison of two-way voltage is completed by integrated circuit.
7. a kind of connecting terminal overheating detection circuit according to claim 1, which is characterized in that when detection, work as terminals
When two acquisition point temperatures on son below power off temperature, X point, Y point current potential are below B point reference potential, in integrated circuit
Two voltage comparator homophase input terminal potentials be all higher than anti-phase input terminal potential, two voltage comparator output ends are all cut
Only, detection circuit exports high potential, at this point, diode, the 5th resistance feedback branch are connected, B point reference potential is elevated, and is formed
Unidirectional return difference；
When any acquisition point temperature on connecting terminal is all higher than power-off temperature, X point or Y point current potential are higher than B point reference potential,
Corresponding voltage comparator homophase input terminal potential is lower than anti-phase input terminal potential, output end saturation conduction, detection circuit output
Low potential, at this point, diode, the 5th resistance feedback branch end, B point reference potential is only determined by 3rd resistor, the 4th resistance,
There is no return differences.
8. a kind of connecting terminal overheating detection circuit according to claim 7, which is characterized in that when detection, work as terminals
When sub- temperature falls back to telegram in reply temperature, X point or Y point current potential are lower than B point reference potential, corresponding voltage comparator non-inverting input terminal electricity
Position is higher than anti-phase input terminal potential, and output end cut-off, detection circuit exports high potential, at this point, diode, the 5th resistance feedback
Branch is connected again, and B point reference potential is elevated again, forms unidirectional return difference again.
9. a kind of single-phase charge-controlled realized using connecting terminal overheating detection circuit described in any one of claim 1 to 8
Intelligent electric energy meter.
10. a kind of single-phase charge-controlled intelligent electric meter according to claim 9, which is characterized in that further include:
The microprocessor being connected with connecting terminal overheating detection circuit；
Liquid crystal display, indicator light, driving circuit, the key being connected with microprocessor；
The magnetic latching relay being connected with driving circuit；
Terminal temperature alarm is issued by indicator light or overheats identifier mode issuing side by adding terminal on liquid crystal display
Sub- temperature alarm；
When the temperature of any temperature sampling point is more than power-off temperature on connecting terminal, connecting terminal overheating detection circuit exports low electricity
Position, microprocessor issue instruction, control magnetic latching relay separating brake by driving circuit, electric energy meter load is removed, terminals
Sub- temperature rise is limited, and electric energy meter is protected；It is aobvious to issue the terminal overheat identifier on alarm or liquid crystal display for indicator light at this time
Existing, concentrator, user power utilization information acquisition system acquisition connecting terminal cross thermal information；
When connecting terminal temperature falls back to telegram in reply temperature, connecting terminal overheating detection circuit exports high potential, and microprocessor issues
Instruction, is closed a floodgate, electric energy meter load is switched on by driving circuit magnetic latching relay；In order to be conducive to defect management, terminal overheat
Alarm is manually released by existing key.
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| CN201820503194.0U CN208238977U (en) | 2018-04-10 | 2018-04-10 | A kind of connecting terminal overheating detection circuit and single-phase charge-controlled intelligent electric meter |
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| CN201820503194.0U CN208238977U (en) | 2018-04-10 | 2018-04-10 | A kind of connecting terminal overheating detection circuit and single-phase charge-controlled intelligent electric meter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108303193A (en) * | 2018-04-10 | 2018-07-20 | 国家电网公司 | A kind of connecting terminal overheating detection circuit and single-phase charge-controlled intelligent electric meter |
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| CN108303193A (en) * | 2018-04-10 | 2018-07-20 | 国家电网公司 | A kind of connecting terminal overheating detection circuit and single-phase charge-controlled intelligent electric meter |
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