CN208488516U - The device of automatic detection protective tube fusing - Google Patents
The device of automatic detection protective tube fusing Download PDFInfo
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- CN208488516U CN208488516U CN201821032987.5U CN201821032987U CN208488516U CN 208488516 U CN208488516 U CN 208488516U CN 201821032987 U CN201821032987 U CN 201821032987U CN 208488516 U CN208488516 U CN 208488516U
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Abstract
The utility model relates to a kind of automatic devices of detection protective tube fusing, comprising: detection circuit and processing circuit under line, detection circuit under the line further include: the first detection branch and the second detection branch；First detection branch connects the first input port of the processing circuit, for exporting the first current potential to the processing circuit；Second detection branch connects the second input port of the processing circuit by protective tube, for exporting the second current potential to the processing circuit；The processing circuit is used to calculate the difference between first current potential and the second current potential, and the state of the protective tube is judged according to the difference.By the detection device of itself, user can be informed in time；User can need not open product shell in the case where, that is, may know that the working condition of manufactuerer's output insurance pipe, without use again another multimeter as judgement tool.
Description
Technical field
The utility model belongs to detection field, and in particular to a kind of device of automatic detection protective tube fusing.
Background technique
At present in instrument class and the product of multimeter class, function of current shelves are essentially all use " protective tube " conduct
The protected mode of internal circuit carries out overcurrent, overvoltage protection.It uses the advantage of protective tube to be: overcurrent easy to accomplish, over-voltage are protected
Shield, and which is simple and convenient, and effect is good.
But in industrial application or maintenance application, user misapplies current gear test voltage or accidentally surveys high current frequent occurrence
Event, and be very easy to that protective tube is caused to blow after maloperation, but without any prompt after blowing.And because protective tube only exists
It just plays a role when uA/mA current gear is used, therefore generally has no effect on other gears after blowing and use, therefore in this case
User also just has no way of learning to the state of protective tube.Since user cannot get any feature prompt, electric current survey is only done again
When amount, it is likely to know that the protective tube of equipment has been blown.Specific method is as shown in Figure 1, in the prior art a kind of digital ten thousand
With the circuit diagram of table current detecting, current measurement is inputted from the end uA/mA, after protective tube inputs, then by shunting accordingly
Resistance generates voltage difference analog signals, is then fed into A/D modulus processing unit；When protective tube is blown or accidentally surveyed by overcurrent electricity
After pressure fusing, for product itself without self-checking function, being need to be by another multimeter detection, and need to open shell, utilizes electricity
Resistance shelves or on-off shelves could examine and determine protective tube fine or not, to increase the consumer cost of user.
Utility model content
In view of the above problems, the object of the present invention is to provide one kind to detect the device that protective tube fuses automatically, to
Protective tube fusing needs to borrow without detection and alarm and under current-mode under non-current measurement mode in the prior art for solution
Help other multimeters that could detect the technical solution of protective tube state, so that user is unable to get any feature prompt in advance,
Great inconvenience is brought to measurement.
To achieve the above object, the utility model takes following technical scheme:
One of the utility model device that detection protective tube fuses automatically characterized by comprising electricity is detected under line
Road and processing circuit, detection circuit under the line further include: the first detection branch and the second detection branch；
First detection branch connects the first input port of the processing circuit, for exporting to the processing circuit
First current potential；Second detection branch connects the second input port of the processing circuit by protective tube, is used for described
Processing circuit exports the second current potential；The processing circuit is used to calculate the difference between first current potential and the second current potential, and
The state of the protective tube is judged according to the difference.
The device of above-mentioned automatic detection protective tube fusing, it is preferred that further include: public input terminal and voltage-limiting protection electricity
Road, electric current are examined under being exported by the pressure limited protection circuit to the line by the public input terminal input voltage limiting protection circuit
Slowdown monitoring circuit simultaneously branches to first detection branch and second detection branch, first detection branch and the second inspection
Surveying branch has ground terminal.
The device of above-mentioned automatic detection protective tube fusing, it is preferred that first detection branch include: transistor Q10,
Q12, resistance R31, R32, R37, R39 and biasing circuit, the resistance R31, resistance R32 are all connected with the transistor Q10's
The emitter of collector and transistor Q12, the resistance R37 connect the base stage of the transistor Q12, the resistance R39 mono-
End connects the base stage of the transistor Q12, other end ground connection；The resistance R32 connects the second input of the processing circuit
Port；The biasing circuit includes sequentially connected resistance R28, R38, R33 and diode D6, the hair of the transistor Q10
Emitter-base bandgap grading is connect with the forward direction of the diode D6, and base stage connects the resistance R38 and R33, the other end of the resistance R33
Connect the reversed of the diode D6.
The device of above-mentioned automatic detection protective tube fusing, it is preferred that second detection branch include: transistor Q4,
Q11, resistance R30, R34, R35 and R36, the collector of the transistor Q4 connect the transistor Q11's by resistance R30
The base stage of base stage, the transistor Q4 connects the protective tube, the emitter ground connection of the transistor Q4 by resistance R34；Institute
The emitter ground connection of transistor Q11 is stated, the collector of the transistor Q11 connects resistance R35 and R36, and the resistance R36 connects
Connect the first input port of the processing circuit.
The device of above-mentioned automatic detection protective tube fusing, it is preferred that further include: pressure limited protection circuit, the voltage-limiting protection
Circuit includes at least 5 diodes, wherein the forward direction of the two pole D4 of positive connection of diode D1, the Opposite direction connection of diode D2
Diode D5's is reversed, and the positive connection diode D2's of diode D3 is reversed, the Opposite direction connection diode D1's of diode D3
It is positive.
The device of above-mentioned automatic detection protective tube fusing, it is preferred that further include: high tension protection circuit, the high voltage protective
Circuit includes: that thermistor PTC and two transistors Q6 and Q7, one end of the thermistor PTC connect the protective tube,
Its other end connects resistance R28, and the collector of the base series of the transistor Q6 and Q7, the transistor Q6 and Q7 connects respectively
Connect the base stage of transistor Q6 and Q7, the transmitting of the emitter connection thermistor PTC and transistor Q12 of the transistor Q7
Pole, the emitter ground connection of the transistor Q6.
The device of above-mentioned automatic detection protective tube fusing, it is preferred that further include: detection circuit on line detects on the line
Circuit includes: shunt circuit and current input terminal；The shunt circuit and the pressure limited protection circuit and in parallel, the electric current
Input terminal is separately connected the protective tube and high tension protection circuit.
The device of above-mentioned automatic detection protective tube fusing, it is preferred that the shunt circuit further include: resistance R6, resistance R7
And it is connect after resistance R15, the resistance R7 and resistance R15 series connection with mA grades of electric current input interfaces, the resistance R6, resistance
It is connect after R7 and resistance R15 series connection with uA grades of electric current input interfaces, the mA grades of electric current input interface is inputted with uA grades of electric currents
Interface is connect with the pressure limited protection circuit and protective tube.
The device of above-mentioned automatic detection protective tube fusing, it is preferred that further include: functional rotating disk switch, the functional rotating disk
Switch is separately connected public input terminal, protective tube and processing circuit.
The device of above-mentioned automatic detection protective tube fusing, it is preferred that further include: display unit and alarm unit, with
The processing circuit connection.
The device of the automatic detection protective tube fusing of the utility model, increases detection insurance on the basis of original circuit
The device of pipe fusing can detect automatically protective tube under any gear after powering and be in normal or blown state, without
The shell of product is dismantled to the state for just knowing fuse, user can be prompted to replace the protective tube to have fused in time, to use
Bring convenience.
Detailed description of the invention
Fig. 1 is a kind of circuit diagram of digital multimeter current detecting in the prior art；
Fig. 2 is the structural schematic diagram for detecting the device of protective tube fusing provided by the utility model embodiment automatically；
Fig. 3 is the circuit diagram for detecting the device of protective tube fusing provided by the utility model embodiment automatically；
Fig. 4 is the method flow diagram for detecting protective tube fusing provided by the utility model embodiment automatically；
Fig. 5 A is display status diagram when protective tube is normal；
Fig. 5 B is display status diagram when protective tube fuses.
Specific embodiment
The utility model is described in detail with reference to the accompanying drawings and examples.
The device that detection protective tube fuses automatically of one kind provided by the utility model embodiment, as shown in Figure 2, comprising:
Detection circuit 1 and processing circuit 2 under line, detection circuit 1 under the line further include: the first detection branch and the second detection branch
Road；
First detection branch connects the first input port of the processing circuit 2, for defeated to the processing circuit 2
First current potential out；Second detection branch connects the second input port of the processing circuit 2 by protective tube F1, for
The processing circuit 2 exports the second current potential；The processing circuit 2 is used to calculate the difference between first current potential and the second current potential
It is worth, and judges the state of the protective tube F1 according to the difference.Specifically, no matter instrument is set in any function shelves, it is switched on wink
Between can obtain the first current potential and the second current potential automatically to detect good, the bad situation of product embedded with safety pipe；Electric current passes through under line
After the first detection branch and the output of the second detection branch in detection circuit, send to the ADC cell processing of processing circuit and drive
Alarm unit issues alarming sound.When protective tube is normal, display unit shows Fuse character as shown in Figure 5A, is about kept for 1 second
Time.After protective tube fusing, display unit shows Cut character as shown in Figure 5 B, and the alert sound of the synchronous sending of alarm unit
Prompt.
Device described in the utility model embodiment adds detection circuit, and with overcurrent, over-voltage, accidentally survey voltage etc. is incorrect
Operation caused by failure, can inform user in time, prompt the working condition of the product " protective tube " during being used,
User's habitually negligent operation probability can be evaded simultaneously.And user can be prompted to replace the protective tube device to have fused in time
Part just knows protective tube fusing convenience without the shell of product is dismantled.
The device that detection protective tube fuses automatically of one kind described in the utility model embodiment, preferably, such as Fig. 2,3 institutes
Show, further includes: public input terminal (COM) J3 and pressure limited protection circuit, electric current input pressure limiting by the public input terminal J3
Protect circuit, under being exported by the pressure limited protection circuit to the line detection circuit 1 and branch to first detection branch with
And second detection branch, first detection branch and the second detection branch have ground terminal.Wherein, public input terminal
(COM) the voltage ratio VSS high 1.2V in end of J3.Specifically, the pressure limited protection circuit is made of 5 diodes, wherein diode
The forward direction of the two pole D4 of positive connection of D1, the Opposite direction connection diode D5's of diode D2 is reversed, the positive connection of diode D3
Diode D2's is reversed, the forward direction of the Opposite direction connection diode D1 of diode D3.Voltage-limiting protection electricity is passed through by public input terminal J3
Road (D1~D5) provides positive 1.2V current potential, supplies the first detection branch all the way, all the way by the second detection of protective tube F1 supply
Branch.
The device that detection protective tube fuses automatically of one kind described in the utility model embodiment, preferably, as shown in figure 3,
First detection branch includes: transistor Q10, Q12, resistance R31, R32, R37, R39 and biasing circuit, the resistance
R31, resistance R32 are all connected with the collector of the transistor Q10 and the emitter of transistor Q12, resistance R37 connection institute
The base stage of transistor Q12 is stated, the one end the resistance R39 connects the base stage of the transistor Q12, other end ground connection；The electricity
Resistance R32 connects the second input port of the processing circuit；The biasing circuit includes sequentially connected resistance R28, R38, R33
And diode D6, the emitter of the transistor Q10 are connect with the forward direction of the diode D6, base stage connects the resistance
R38 and R33, the other end of the resistance R33 connect the reversed of the diode D6.Specifically, being flowed into from public input terminal
Electric current after pressure limited protection circuit, the forward current that provides by R28, R38, R33 and D6 in the first detection branch group
At the biasing circuit of Q10, the first input port CTR_2.2V output high level letter for the processing circuit that R31 is connected with R32 is controlled
Number.
The device that detection protective tube fuses automatically of one kind described in the utility model embodiment, preferably, in Fig. 3, institute
Stating the second detection branch includes: transistor Q4, Q11, resistance R30, R34, R35 and R36, and the collector of the transistor Q4 is logical
The base stage that resistance R30 connects the transistor Q11 is crossed, the base stage of the transistor Q4 connects the protective tube by resistance R34,
The emitter of the transistor Q4 is grounded；The emitter of the transistor Q11 is grounded, the collector connection of the transistor Q11
Resistance R35 and R36, the resistance R36 connect the first input port of the processing circuit.Second detection branch need by
Protective tube, flows through R34, and Q4, Q11 control R35 connect the second input port CTR_1.2V of processing circuit with R36.Work as protective tube
When normal, the second input port CTR_1.2V in the second detection branch of transistor Q4 control is high level；If built-in " protect
Danger pipe " is to disconnect, then the second input port CTR_1.2V in the second detection branch of transistor Q4 control is become by high level
For low level.Therefore the level difference for comparing first input port and the acquisition of the second input port can judge the good of protective tube
It is bad.
The device that detection protective tube fuses automatically of one kind described in the utility model embodiment, preferably, further include: high pressure
Circuit is protected, the high tension protection circuit includes: thermistor PTC and two transistor Q6 and Q7, the thermistor PTC
One end connect the protective tube, the other end connects resistance R28, the base series of the transistor Q6 and Q7, the crystal
The collector of pipe Q6 and Q7 are separately connected the base stage of transistor Q6 and Q7, and the emitter of the transistor Q7 connects thermistor
The emitter of PTC and transistor Q12, the emitter ground connection of the transistor Q6.
The device that detection protective tube fuses automatically of one kind described in the utility model embodiment, preferably, such as Fig. 2 and Fig. 3
It is described, further includes: detection circuit 4 on line, detection circuit 4 includes: shunt circuit 41 and current input terminal J1 on the line；Institute
It is in parallel with the pressure limited protection circuit 12 to state shunt circuit 41, the current input terminal J1 be separately connected the protective tube F1 and
High tension protection circuit.When being in current measurement state, supply three tunnels that are biased with of the present apparatus: the first via is voltage-limiting protection electricity
Road, the second tunnel are shunt resistance R6, R7, R15, and third road is current input terminal.Electric current is flowed into from input terminal, by voltage-limiting protection electricity
Road carries out voltage-limiting protection, while by shunt resistance to adjust different size of current.
In the case where according to the measurement of normal range amount of imports constant current, the transistor Q10 control in the first detection branch is defeated
The 4th current potential of transistor Q4 control is high potential in third current potential out and the second detection branch, indicates that protective tube is normal,
And without any warning.When inputting overcurrent (referring to that the electric current greater than the range expires measurement value) or accidentally surveying over-voltage (being greater than 2V), because of mistake
The factors such as pressure or excess overcurrent lead to the fusing of protective tube, then the third current potential of Q10 control terminal drags down, and transistor Q4 control
4th current potential is still constant, and buzzing at this time issues the alarm song of continuous " drop -- drop ", to prompt user's internal fuse to be in
Blown state.
The utility model embodiment also provides a kind of method of automatic detection protective tube fusing, as shown in Figure 4, comprising:
Step 401, to detection circuit input current signal under line, the current signal branch to the first detection branch and
Second detection branch；
Step 402, what the first current potential and second detection branch for obtaining the first detection branch output exported
Second current potential；The difference between first current potential and the second current potential is calculated, and the protective tube is judged according to the difference
State.
Specifically, no matter instrument is set in any function shelves, booting moment can obtain the first current potential and the second current potential automatically
To detect good, the bad situation of product embedded with safety pipe；Electric current passes through the first detection branch and the second inspection under line in detection circuit
After surveying branch output, send to the ADC cell processing of processing circuit and alarm unit is driven to issue alarming sound.When protective tube is normal
When, display unit shows Fuse character as shown in Figure 5A, about keeps 1 second time.After protective tube fusing, display unit is shown
Cut character as shown in Figure 5 B, and the synchronous police's sound that issues of alarm unit prompts.
Preferably, electric current first passes through public input terminal (COM) input voltage limiting protection circuit, it is defeated by the pressure limited protection circuit
To detection circuit under the line and first detection branch and second detection branch are branched to out, first detection
Branch and the second detection branch have ground terminal.Wherein, the voltage of public input terminal is 1.2V higher than the end VSS in circuit.Tool
Body, the pressure limited protection circuit is made of 5 diodes, wherein the forward direction of the two pole D4 of positive connection of diode D1, two poles
The Opposite direction connection diode D5's of pipe D2 is reversed, and the positive connection diode D2's of diode D3 is reversed, and diode D3's is reversed
Connect the forward direction of diode D1.By public input terminal J3 by pressure limited protection circuit (D1~D5), positive 1.2V current potential is provided, one
Road supplies the first detection branch, supplies the second detection branch by protective tube F1 all the way.
One of the utility model embodiment method that detection protective tube fuses automatically, preferably, the method is also wrapped
It includes:
After first shunting signal is input to the first detection branch, is adjusted by biasing circuit and export the first current potential；Second
Shunting signal is input to the second detection branch after protective tube and high tension protection circuit and exports the second current potential；
When first current potential is high level, and second current potential is high level, the protective tube is normal；
When first current potential is high level, and second current potential is low level, the protective tube fusing.
Wherein, the biasing circuit includes sequentially connected resistance R28, R38, R33 and diode D6, the transistor
The emitter of Q10 is connect with the forward direction of the diode D6, and base stage connects the resistance R38 and R33, the resistance R33
The other end connect the reversed of the diode D6.Specifically, the electric current flowed into from public input terminal passes through pressure limited protection circuit
Afterwards, the forward current provided controls resistance R31 and R32 in the first detection branch by biasing circuit in the first detection branch
High level signal is exported to first input port CTR_2.2V.
Second detection branch includes: transistor Q4, Q11, resistance R30, R34, R35 and R36, the collection of the transistor Q4
Electrode connects the base stage of the transistor Q11 by resistance R30, and the base stage of the transistor Q4 passes through described in resistance R34 connection
Protective tube, the emitter ground connection of the transistor Q4；The emitter of the transistor Q11 is grounded, the current collection of the transistor Q11
Pole connects resistance R35 and R36, and the resistance R36 connects the first input port of the processing circuit.By the second detection branch
The shunting signal on road first passes through protective tube, passes through R34, and Q4, Q11 control R35 connect the second input terminal of processing circuit with R36
Mouth CTR_1.2V.The second input port CTR_1.2V when protective tube is normal, in the second detection branch of transistor Q4 control
For high level；If built-in " protective tube " is to disconnect, the second input terminal in the second detection branch of transistor Q4 control
Mouth CTR_1.2V becomes low level from high level.Therefore compare the level difference of first input port and the acquisition of the second input port
It can judge the quality of protective tube.
In preferred embodiment, device is protected by high tension protection circuit.The high tension protection circuit includes: heat
Quick resistance PTC and two transistors Q6 and Q7, one end of the thermistor PTC connect the protective tube, and the other end connects
Connecting resistance R28, the collector of the base series of the transistor Q6 and Q7, the transistor Q6 and Q7 are separately connected transistor Q6
And the base stage of Q7, the emitter of the emitter connection thermistor PTC and transistor Q12 of the transistor Q7, the crystal
The emitter of pipe Q6 is grounded.
One of the utility model embodiment method that detection protective tube fuses automatically, preferably, the method is also wrapped
It includes:
The detection circuit input current signal on line, the current signal branch to the first detection branch and the second detection
Branch；Obtain the third current potential of the first detection branch output and the 4th current potential of second detection branch output；Meter
The difference between the third current potential and the 4th current potential is calculated, and judges the state of the protective tube according to the difference.Specifically,
The method of detection circuit can individually be implemented on line described in above-described embodiment, can also be in the utility model other embodiments
On the basis of further implement, to increase protective tube judgement accuracy.Preferably, carrying out pressure limiting guarantor by pressure limited protection circuit
Shield, while by shunt resistance to adjust different size of current.
One of the utility model embodiment method that detection protective tube fuses automatically, preferably, the method is also wrapped
It includes:
Third shunting signal passes through protective tube, and the first detection branch is input to after being adjusted by biasing circuit and exports third electricity
Position；4th shunting signal is input to the second detection branch after high tension protection circuit and exports the 4th current potential；
When the third current potential is high level, and the 4th current potential is high level, the protective tube is normal；
When the third current potential is low level, and the 4th current potential is high level, the protective tube fusing.
In the case where according to the measurement of normal range amount of imports constant current, the transistor Q10 control in the first detection branch is defeated
The 4th current potential of transistor Q4 control is high potential in third current potential out and the second detection branch, indicates that protective tube is normal,
And without any warning.When inputting overcurrent (referring to that the electric current greater than the range expires measurement value) or accidentally surveying over-voltage (being greater than 2V), because of mistake
The factors such as pressure or excess overcurrent lead to the fusing of protective tube, then the third current potential of Q10 control terminal drags down, and transistor Q4 control
4th current potential is still constant, and buzzing at this time issues the alarm song of continuous " drop -- drop ", to prompt user's internal fuse to be in
Blown state.
To sum up, it is molten to increase protective tube for the device and method of automatic detection protective tube fusing described in the utility model embodiment
Disconnected detection device and the warning circuit that fuses improve the ease of use of multimeter, more user-friendly design；By itself
Detection device can inform user in time；In the case that user can need not open product shell, that is, it may know that manufactuerer's output insurance pipe
Working condition, without use again another multimeter as judgement tool.And it is outer to using ring to be able to maintain original measurement function
The characteristics of border and Safety Approval do not influence, and improve technological innovation and product, has obtained liking for more clients, has added city
The new highlight of field sale, is a multimeter more suitable for public use.
The utility model is not limited to above-mentioned preferred forms, anyone can obtain under the enlightenment of the utility model
Other various forms of products, however, make any variation in its shape or structure, it is all that there is same as the present application or phase
Approximate technical solution, all falls within the protection scope of the utility model.
Claims (10)
1. a kind of device of automatic detection protective tube fusing characterized by comprising detection circuit and processing circuit under line,
Detection circuit under the line further include: the first detection branch and the second detection branch；
First detection branch connects the first input port of the processing circuit, for exporting first to the processing circuit
Current potential；Second detection branch connects the second input port of the processing circuit by protective tube, is used for the processing
The second current potential of circuit output；The processing circuit is used to calculate difference between first current potential and the second current potential, and according to
The difference judges the state of the protective tube.
2. a kind of device of automatic detection protective tube fusing according to claim 1, which is characterized in that further include: it is public
Input terminal and pressure limited protection circuit, electric current is by the public input terminal input voltage limiting protection circuit, by the voltage-limiting protection
Detection circuit and first detection branch and second detection branch are branched under circuit output to the line, described
One detection branch and the second detection branch have ground terminal.
3. a kind of device of automatic detection protective tube fusing according to claim 1, which is characterized in that first detection
Branch includes: transistor Q10, Q12, resistance R31, R32, R37, R39 and biasing circuit, and the resistance R31, resistance R32 are equal
The collector of the transistor Q10 and the emitter of transistor Q12 are connected, the resistance R37 connects the transistor Q12's
Base stage, the one end the resistance R39 connect the base stage of the transistor Q12, other end ground connection；Described in the resistance R32 connection
Second input port of processing circuit；The biasing circuit includes sequentially connected resistance R28, R38, R33 and diode D6,
The emitter of the transistor Q10 is connect with the forward direction of the diode D6, and base stage connects the resistance R38 and R33, institute
The other end for stating resistance R33 connects the reversed of the diode D6.
4. a kind of device of automatic detection protective tube fusing according to claim 1, which is characterized in that second detection
Branch includes: transistor Q4, Q11, resistance R30, R34, R35 and R36, and the collector of the transistor Q4 passes through resistance R30
The base stage of the transistor Q11 is connected, the base stage of the transistor Q4 connects the protective tube, the crystal by resistance R34
The emitter of pipe Q4 is grounded；The emitter of the transistor Q11 is grounded, the collector connection resistance R35 of the transistor Q11 with
And R36, the resistance R36 connect the first input port of the processing circuit.
5. a kind of device of automatic detection protective tube fusing according to claim 1, which is characterized in that further include: pressure limiting
Circuit is protected, the pressure limited protection circuit includes at least 5 diodes, wherein the two pole D4 of positive connection of diode D1 are just
To the Opposite direction connection diode D5's of diode D2 is reversed, reversed, the diode D3 of the positive connection diode D2 of diode D3
Opposite direction connection diode D1 forward direction.
6. a kind of device of automatic detection protective tube fusing according to claim 3, which is characterized in that further include: high pressure
Circuit is protected, the high tension protection circuit includes: thermistor PTC and two transistor Q6 and Q7, the thermistor PTC
One end connect the protective tube, the other end connects resistance R28, the base series of the transistor Q6 and Q7, the crystal
The collector of pipe Q6 and Q7 are separately connected the base stage of transistor Q6 and Q7, and the emitter of the transistor Q7 connects thermistor
The emitter of PTC and transistor Q12, the emitter ground connection of the transistor Q6.
7. a kind of device of automatic detection protective tube fusing according to claim 2, which is characterized in that further include: on line
Detection circuit, detection circuit includes: shunt circuit and current input terminal on the line；The shunt circuit and the pressure limiting are protected
Protection circuit with it is in parallel, the current input terminal is separately connected the protective tube and high tension protection circuit.
8. a kind of device of automatic detection protective tube fusing according to claim 7, which is characterized in that the shunt circuit
Further include: resistance R6, resistance R7 and resistance R15, the resistance R7 and resistance R15 series connection after with mA grades of electric current input interfaces
It is connect after connection, the resistance R6, resistance R7 and resistance R15 series connection with uA grades of electric current input interfaces, the mA grades of electric current is defeated
Incoming interface is connect with the pressure limited protection circuit and protective tube with uA grades of electric current input interfaces.
9. a kind of device of automatic detection protective tube fusing according to claim 2, which is characterized in that further include: function
Rotary disk shutter, the functional rotating disk switch are separately connected public input terminal, protective tube and processing circuit.
10. a kind of device of automatic detection protective tube fusing according to claim 1, which is characterized in that further include: display
Unit and alarm unit are connect with the processing circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821032987.5U CN208488516U (en) | 2018-07-02 | 2018-07-02 | The device of automatic detection protective tube fusing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821032987.5U CN208488516U (en) | 2018-07-02 | 2018-07-02 | The device of automatic detection protective tube fusing |
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| Publication Number | Publication Date |
|---|---|
| CN208488516U true CN208488516U (en) | 2019-02-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821032987.5U Active CN208488516U (en) | 2018-07-02 | 2018-07-02 | The device of automatic detection protective tube fusing |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108614186A (en) * | 2018-07-02 | 2018-10-02 | 优利德科技(中国)股份有限公司 | The device and method of automatic detection protective tube fusing |
-
2018
- 2018-07-02 CN CN201821032987.5U patent/CN208488516U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108614186A (en) * | 2018-07-02 | 2018-10-02 | 优利德科技(中国)股份有限公司 | The device and method of automatic detection protective tube fusing |
| CN108614186B (en) * | 2018-07-02 | 2024-03-12 | 优利德科技(中国)股份有限公司 | Device and method for automatically detecting fusing of fuse tube |
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