CN209055243U - Charging gun temperature sensing circuit and charging gun - Google Patents
Charging gun temperature sensing circuit and charging gun Download PDFInfo
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- CN209055243U CN209055243U CN201821460027.9U CN201821460027U CN209055243U CN 209055243 U CN209055243 U CN 209055243U CN 201821460027 U CN201821460027 U CN 201821460027U CN 209055243 U CN209055243 U CN 209055243U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
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Abstract
The utility model provides charging gun temperature sensing circuit and charging gun, comprising: sample circuit, calculus of differences circuit and the temperature-detecting device being arranged in inside charging gun pipette tips；The temperature-detecting device for detecting the temperature inside charging gun pipette tips, and generates voltage signal；The sample circuit, for sampling the voltage signal and being sent to calculus of differences circuit；The calculus of differences circuit generates detection signal, and be sent to external circuit for handling the voltage signal.Charging gun temperature sensing circuit provided by the utility model, sampled signal is handled by using differential mode, common mode interference of sampled signal during charging gun cable transmission can effectively be avoided, entire technical solution can be improved the accuracy of temperature detection, effectively avoid the generation of the accidents such as spontaneous combustion, on fire.
Description
Technical field
The utility model belongs to charging equipment technical field, more specifically, be related to charging gun temperature sensing circuit and
Charging gun.
Background technique
With the universal and development of electric car, charging safety problem is received significant attention.The country has more electronic vapour
Accident on fire occurs in vehicle charging process.Reason of fire mainly due to battery system manage it is not perfect, communication it is incompatible, with
Charging equipment communicates the problems such as over-charging of battery caused by obstacle, short circuit, cannot monitor, alarm in advance, so as to cause thermal runaway, certainly
The problems such as firing, is on fire, the link that makes to charge is with very big security risk.Therefore, be badly in need of currently on the market it is a kind of simple, be applicable in
Pipette tips system for detecting temperature charge to solve the problems, such as this.
Utility model content
The purpose of this utility model is to provide charging gun temperature sensing circuits, it is intended to solve to shift to an earlier date in charging process
Monitoring, alarm, cause thermal runaway, spontaneous combustion, it is on fire the problems such as.
To achieve the above object, the utility model embodiment provides charging gun temperature sensing circuit, comprising: sample circuit,
Calculus of differences circuit and the temperature-detecting device being arranged in inside charging gun pipette tips；The temperature-detecting device, for detecting
Temperature inside charging gun pipette tips, and generate voltage signal；The sample circuit, connect with temperature-detecting device, for sampling
The voltage signal is simultaneously sent to the calculus of differences circuit by the voltage signal；The calculus of differences circuit, for institute
It states voltage signal to be handled, generates detection signal, and the detection signal is sent to external circuit.
Further, the charging gun temperature sensing circuit further include: current source circuit；The current source circuit, is used for
It powers to the sample circuit and the temperature-detecting device, resistance signal is then changed into the voltage signal that can detecte.
Further, the current source circuit includes: voltage input end, output end, feedback end, the first amplifier, the second fortune
It puts, first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance and first diode；First electricity
One end of resistance connects the voltage input end, and the other end connects the inverting input terminal of first amplifier；One end of second resistance
The inverting input terminal of first amplifier is connected, the other end connects the output end of second amplifier；One end of 3rd resistor connects
The output end of first amplifier is connect, the other end connects the non-inverting input terminal of first amplifier；The same phase of first amplifier
Input end grounding；One end of 4th resistance connects the output end of first amplifier, the other end by the first diode with
The output end connection, the anode of the first diode connect the output end；One end connection described second of 5th resistance
The inverting input terminal of amplifier, other end ground connection；One end of 6th resistance is grounded, the homophase input of the other end and second amplifier
End is connected with the feedback end；The inverting input terminal of first amplifier is electrically connected with the output end of first amplifier；It is described
The inverting input terminal of second amplifier is electrically connected with the output end of second amplifier；The output end and the feedback end respectively with
The sample circuit connection.
Further, the current source circuit further include: first capacitor, the second capacitor, the 7th resistance and the 8th resistance；The
One end of seven resistance connects the inverting input terminal of first amplifier, and the other end connects the output end of first amplifier；First
Capacitor is connect with the 7th resistor coupled in parallel；One end of 8th resistance connects the inverting input terminal of second amplifier, the other end
Connect the output end of second amplifier；Second capacitor is connect with the 8th resistor coupled in parallel；4th resistance passes through first
Diode connects the output end, and the anode of the first diode connects the output end.
Further, the sample circuit includes: the 9th resistance and the tenth resistance；The temperature-detecting device includes first
Temperature sensor and second temperature sensor；One end of 9th resistance and one end of the tenth resistance are connected to the first sampled point, institute
The other end for stating the 9th resistance connects one end of first temperature sensor, the other end of first temperature sensor and institute
The one end for stating second temperature sensor is connected to the second sampled point, and the other end of the tenth resistance and the second temperature sense
The other end of device is connected to third sampled point；First sampled point and second sampled point respectively with the current source circuit
Connection；First sampled point, second sampled point and the third sampled point respectively with the calculus of differences circuit connection.
Further, the calculus of differences circuit includes: the first difference unit and the second difference unit；First difference
The non-inverting input terminal of unit connects second sampled point, and inverting input terminal connects first sampled point, first difference
The output end of unit connects external circuit；The non-inverting input terminal of second difference unit connects first sampled point, reverse phase
Input terminal connects the third sampled point, and the output end of second difference unit connects external circuit.
Further, the sample circuit includes: eleventh resistor, twelfth resistor, thirteenth resistor and the 14th electricity
Resistance；The temperature-detecting device includes the first temperature sensor and second temperature sensor；One end of eleventh resistor, the 13rd
One end of resistance and one end of the 14th resistance are connected to the first tie point；One end of twelfth resistor, the first temperature sensor
One end and one end of second temperature sensor be connected to the second tie point；The other end of the eleventh resistor and the described tenth
The other end of two resistance is connected to the 4th sampled point；The other end of 13 resistance is another with first temperature sensor
End is connected to the 5th sampled point；The other end of 14th resistance and the other end of the second temperature sensor are connected to the
Six sampled points；First tie point is connect with the current source circuit respectively with second tie point；4th sampling
Point, the 5th sampled point and the 6th sampled point respectively with the calculus of differences circuit connection.
Further, the calculus of differences circuit includes: the first difference unit and the second difference unit；First difference
The non-inverting input terminal of unit connects the 5th sampled point, and inverting input terminal connects the 4th sampled point, first difference
The output end of unit connects external circuit；The non-inverting input terminal of second difference unit connects the 6th sampled point, reverse phase
Input terminal connects the 4th sampled point, and the output end of second difference unit connects external circuit.
Further, first difference unit includes: third amplifier, the 15th resistance, the 16th resistance, the 17th electricity
Resistance, the 18th resistance, the 19th resistance, the 20th resistance, third capacitor, the 4th capacitor, the 5th capacitor, the 6th capacitor and the 7th
Capacitor；One end of 15th resistance connects the non-inverting input terminal of first difference unit, and the other end is connected by the 16th resistance
Connect the non-inverting input terminal of the third amplifier；One end of third capacitor and the 15th resistance and the 16th resistance connect
It connects, other end ground connection；One end of 17th resistance connects the inverting input terminal of first difference unit, and the other end passes through the tenth
Eight resistance connect the inverting input terminal of the third amplifier；One end of 4th capacitor and the 17th resistance and the described 18th
Resistance connection, other end ground connection；One end of 5th capacitor connects the non-inverting input terminal of the third amplifier, described in other end connection
The inverting input terminal of third amplifier；One end of 19th resistance connects the inverting input terminal of the third amplifier, other end connection
The output end of the third amplifier；6th capacitor is connect with the 19th resistor coupled in parallel；The homophase input of the third amplifier
End passes through the 20th resistance eutral grounding；7th capacitor is connect with the 20th resistor coupled in parallel；The output end of the third amplifier connects
Connect the output end of first difference unit.
Further, first difference unit and the second difference unit circuit structure having the same.
Further, first temperature sensor and the second temperature sensor are thermistor.
The utility model embodiment also provides charging gun, including gun body and pipette tips, which is characterized in that further includes any of the above-described
Charging gun temperature sensing circuit described in.
The beneficial effect of charging gun temperature sensing circuit and charging gun provided by the embodiment of the utility model is: with it is existing
Technology is compared, charging gun temperature sensing circuit provided by the embodiment of the utility model, use current source rather than conventional voltage source for
Sample circuit power supply, can effectively inhibit influence of the electromagnetic interference to signal source voltage signal；By calculus of differences circuit to institute
It states voltage signal to be handled, generates detection signal, can effectively avoid sampled signal during charging gun cable transmission
Common mode interference, entire technical solution can be improved the accuracy of temperature detection, effectively avoids the hair of the accidents such as spontaneous combustion, on fire
It is raw.
Detailed description of the invention
Fig. 1 is the circuit diagram for the charging gun temperature sensing circuit that the utility model one embodiment provides；
Fig. 2 is that the circuit of the current source circuit for the charging gun temperature sensing circuit that another embodiment of the utility model provides shows
It is intended to；
Fig. 3 is the circuit diagram for the charging gun temperature sensing circuit that the utility model another embodiment provides；
Fig. 4 is the circuit diagram for the charging gun temperature sensing circuit that another embodiment of the utility model provides；
Fig. 5 is the circuit of the first difference unit of the charging gun temperature sensing circuit that the utility model one embodiment provides
Schematic diagram.
Appended drawing reference: current source circuit 10, sample circuit 20, calculus of differences circuit 30, temperature-detecting device 40, the first temperature
Spend sensor 41, second temperature sensor 42, the first difference unit 31, the second difference unit 32.
Specific embodiment
In order to which technical problem to be solved in the utility model, technical solution and beneficial effect is more clearly understood, with
Lower combination accompanying drawings and embodiments, the present invention will be further described in detail.It should be appreciated that specific reality described herein
It applies example to be only used to explain the utility model, is not used to limit the utility model.
Specific embodiment:
As shown in Figure 1-3, the utility model embodiment provides charging gun temperature sensing circuit, comprising: sample circuit 20, poor
The temperature-detecting device 40 for dividing computing circuit 30 and being arranged in inside charging gun pipette tips, the temperature-detecting device may include
First temperature sensor 41 and second temperature sensor 42；First temperature sensor 41 and the second temperature sensor
42, change itself resistance value for detecting the temperature inside charging gun pipette tips, and according to temperature；The sample circuit 20, with institute
It states the first temperature sensor 41 and the second temperature sensor 42 to connect, for sampling the voltage signal and by the voltage
Signal is sent to the calculus of differences circuit 30；The calculus of differences circuit 30, it is raw for handling the voltage signal
At detection signal, and the detection signal is sent to external circuit.
The working principle of the charging gun temperature sensing circuit are as follows: by first temperature sensor 41 and second temperature
Degree sensor 42 is separately positioned on positive pole line side inside charging gun pipette tips and negative busbar side, the sample circuit 20 and described the
One temperature sensor 41 and the second temperature sensor 42 constitute bridge circuit, predetermined current are loaded on bridge circuit, institute
It states bridge circuit and forms voltage signal relevant to temperature, the calculus of differences circuit 30 handles the voltage signal,
Detection signal is generated, and the detection signal is sent to external circuit.External circuit can be calculated according to the detection signal
The resistance value of first temperature sensor 41 and/or the resistance value of the second temperature sensor 42 are obtained, and then obtains institute
The negative mother that the temperature information and/or the second temperature sensor 42 for stating the positive pole line side that the first temperature sensor 41 measures measure
The temperature information of line side, and according to the temperature information of positive pole line side and/or the temperature information of negative busbar side adjust output power or
Issue alarm signal.
Charging gun temperature sensing circuit provided by the embodiment of the utility model, by current source rather than voltage source is sampling electricity
Road power supply, and the first temperature sensor 41 is acquired by the sample circuit 20 in scheme and second temperature sensor 42 generates with
The relevant voltage signal of temperature can further increase signal source voltage, increase signal-to-noise ratio；And it is right by calculus of differences circuit 30
The voltage signal is handled, and detection signal is generated, and can be avoided charging gun temperature signal in rifle line transmission process by altogether
Mould interference effect, raising temperature detecting precision is accurate to monitor charging gun temperature, rationally adjusts charger output power, avoids certainly
The generation of the accidents such as combustion, on fire.
Optionally, first temperature sensor 41 and the second temperature sensor 42 are thermistor.
First temperature sensor 41 and the model of the second temperature sensor 42 can be PT1000.PT1000 is
Platinum resistance thermometer sensor,.1000 after PT indicate that its resistance value at 0 DEG C is 1000 ohm.Its working principle: when PT1000 is Celsius 0
When spending, its resistance value is 1000 ohm, and resistance value increases with increased temperature, and approximation changes linearly.Each resistance value and temperature
The corresponding relationship of degree can be inquired by PT1000 phasing meter.
In a specific embodiment, the charging gun temperature sensing circuit further include: current source circuit；The electric current
Source circuit, it is pre- for being provided to the sample circuit 20, first temperature sensor 41 and the second temperature sensor 42
If electric current.
Optionally, as shown in Fig. 2, the current source circuit includes: voltage input end, output end, feedback end, the first amplifier
AMP1, the second amplifier AMP2, first diode D1, first capacitor C1, the second capacitor C2, first resistor R1, second resistance R2,
Three resistance R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7 and the 8th resistance R8；First resistor R1's
One end connects the voltage input end, and the other end connects the inverting input terminal of the first amplifier AMP1；The one of second resistance R2
End connects the inverting input terminal of the first amplifier AMP1, and the other end connects the output end of the second amplifier AMP2；7th electricity
One end of resistance R7 connects the inverting input terminal of the first amplifier AMP1, and the other end connects the output of the first amplifier AMP1
End；First capacitor C1 is connected in parallel with the 7th resistance R7；One end of 3rd resistor R3 connects the first amplifier AMP1's
Output end, the other end connect the non-inverting input terminal of the first amplifier AMP1；The homophase input of the first amplifier AMP1 terminates
Ground GND；One end of the 4th resistance R4 connects the output end of the first amplifier AMP1, and the other end connects first diode D1
Cathode；The anode of the first diode D1 connects the output end；One end of 8th resistance R8 connects second amplifier
The inverting input terminal of AMP2, the other end connect the output end of the second amplifier AMP2；Second capacitor C2 and the 8th resistance
R8 is connected in parallel；One end of 5th resistance R5 connects the inverting input terminal of the second amplifier AMP2, and the other end is grounded GND；The
One end of six resistance R6 is grounded GND, and the other end is connect with the non-inverting input terminal of the second amplifier AMP2 and the feedback end；Institute
It states output end and is connect respectively with the sample circuit 20 with the feedback end.
Optionally, the current source circuit is forward adjustable current source circuit.By adjusting the input voltage value of voltage input end,
The adjustable predetermined current, can also realize noncontinuous sampling, further increase the charging gun temperature sensing circuit
Sampling precision and detection accuracy.
It is sample circuit 20 by the way that the current source circuit is arranged, relative to use voltage source to power for sample circuit 20,
It can be very good to inhibit electromagnetic interference；In addition, the output electric current due to the current source circuit is adjustable, can be realized is being needed
The electric current for flowing through the first temperature sensor 41 and second temperature sensor 42 is improved when sampling, to improve into calculus of differences
The voltage value of the sampled voltage signal of circuit 30 increases signal-to-noise ratio, and can be realized when not needing sampling, adjustable institute
The electric current for stating current source circuit output is zero, reduces power consumption.
By the way that the first diode D1 is arranged, it is ensured that current source provides current direction uniquely and can effectively turn off
Current source.
As an embodiment, as shown in figure 3, the sample circuit 20 includes: the 9th resistance R9 and the tenth resistance
R10；One end of 9th resistance R9 and one end of the tenth resistance R10 are connected to the first sampled point, and the 9th resistance R9's is another
End connects one end of first temperature sensor 41, and the other end of first temperature sensor 41 and the second temperature pass
One end of sensor 42 is connected to the second sampled point, the other end and the second temperature sensor 42 of the tenth resistance R10
The other end is connected to third sampled point；First sampled point and second sampled point connect with the current source circuit respectively
It connects；First sampled point, second sampled point and the third sampled point are connect with the calculus of differences circuit 30 respectively.
Optionally, the calculus of differences circuit 30 includes: the first difference unit 31 and the second difference unit 32；Described first
The non-inverting input terminal of difference unit 31 connects second sampled point, and inverting input terminal connects first sampled point, and described the
The output end of one difference unit 31 connects external circuit；The non-inverting input terminal connection described first of second difference unit 32 is adopted
Sampling point, inverting input terminal connect the third sampled point, and the output end of second difference unit 32 connects external circuit.
Optionally, first difference unit 31 and the circuit structure having the same of the second difference unit 32.
The 9th resistance R9 and first temperature sensor 41, which are connected in series, constitutes the first branch, the tenth resistance
R10 and the second temperature sensor 42, which are connected in series, constitutes second branch.The first branch and the second branch are by institute
Current source circuit offer is provided, is known predetermined current.
First difference unit 31 be used for the voltage difference between second sampled point and first sampled point into
Row processing, generates first detection signal, and the first detection signal is sent to external circuit；Second difference unit 32
It is handled for the voltage difference between first sampled point and the third sampled point, generates the second detection signal, and will
The second detection signal is sent to external circuit.
The electric current of the first branch and the second branch and are as follows:
I=I1+I2 (1)
Wherein, I be electric current and, i.e., current source circuit provide the predetermined current, I1For the electric current of the first branch, I2For
The electric current of second branch.
The first detection signal are as follows:
U1=I2(R10+R23) (2)
Wherein, U1For first detection signal, I2For the electric current of second branch, R10For the tenth resistance, R23For second temperature biography
Sensor.
The second detection signal are as follows:
U2=I2×R10 (3)
Wherein, U2For the second detection signal, I2For the electric current of second branch, R10For the tenth resistance.
Because of U2With R10It is known that the electric current I of second branch can be obtained according to formula (3)2, by I2The second temperature can be obtained after substitution formula (2)
Spend the resistance value R of sensor 4223, by I2The electric current I of the first branch can be obtained after substitution formula (1)1。
Because the first branch is in parallel with second branch, then the voltage at first branch both ends is equal with second branch, then basis
Ohm's law can obtain:
I1(R9+R22)=U1 (4)
Wherein, I2For the electric current of second branch, R9For the 9th resistance, R22For the first temperature sensor, U1For the first detection letter
Number.
Because of R9With U1It is known that the electric current I for the first branch that will be calculated according to formula (1) and formula (3)1Substitution formula (4),
The resistance value R of the first temperature sensor can be obtained22。
Charging gun positive and negative busbar side is obtained according to the resistance value of first temperature sensor and the second temperature sensor
Temperature, and the temperature is monitored.
As another embodiment, as shown in figure 4, the sample circuit 20 includes: eleventh resistor R11, the tenth
Two resistance R12, thirteenth resistor R13 and the 14th resistance R14；One end of eleventh resistor R11, thirteenth resistor R13 one
End and one end of the 14th resistance R14 are connected to the first tie point；One end of twelfth resistor R12, the first temperature sensor 41
One end and one end of second temperature sensor 42 be connected to the second tie point；The other end of the eleventh resistor R11 and institute
The other end for stating twelfth resistor R12 is connected to the 4th sampled point；The other end of 13 resistance and first temperature pass
The other end of sensor 41 is connected to the 5th sampled point；The other end of the 14th resistance R14 and the second temperature sensor
42 other end is connected to the 6th sampled point；First tie point and second tie point respectively with the current source circuit
Connection；4th sampled point, the 5th sampled point and the 6th sampled point connect with the calculus of differences circuit 30 respectively
It connects.
Optionally, as shown in figure 4, the calculus of differences circuit 30 includes: the first difference unit 31 and the second difference unit
32；The non-inverting input terminal of first difference unit 31 connects the 5th sampled point, and inverting input terminal connection the described 4th is adopted
The output end of sampling point, first difference unit 31 connects external circuit；The non-inverting input terminal of second difference unit 32 connects
The 6th sampled point is connect, inverting input terminal connects the 4th sampled point, the output end connection of second difference unit 32
External interface circuit.
Eleventh resistor R11 and twelfth resistor R12, which are connected in series, constitutes third branch, the thirteenth resistor R13 with
First temperature sensor 41, which is connected in series, constitutes the 4th branch, and the 14th resistance R14 and the second temperature sense
Device 42, which is connected in series, constitutes the 5th branch.The third branch, the 4th branch and the 5th branch electric current by described
Current source circuit provides, and is known predetermined current.
First difference unit 31 be used for the voltage difference between the 5th sampled point and the 4th sampled point into
Row processing generates third and detects signal, and third detection signal is sent to external circuit；Second difference unit 32
Calculus of differences is carried out for the voltage difference between the 6th sampled point and the 4th sampled point, generates the 4th detection signal,
And the 4th detection signal is sent to external circuit.
The third branch, the 4th branch and the 5th road electric current and are as follows:
I=I3+I4+I5 (5)
Wherein, I be electric current and, i.e., current source circuit provide the predetermined current, I3For the electric current of third branch, I4For
The electric current of 4th branch, I5For the electric current of the 5th branch.
The third detects signal are as follows:
U3=I4R13-I3R11 (6)
Wherein, U3Signal, I are detected for third4For the electric current of the 4th branch, I3For the electric current of third branch, R13It is the 13rd
Resistance, R11For eleventh resistor.
The 4th detection signal are as follows:
U4=I5R14-I3R11 (7)
Wherein, U4For the 4th detection signal, I5For the electric current of the 5th branch, I3For the electric current of third branch, R14It is the 14th
Resistance, R11For eleventh resistor.
Because of U3、U4、R14、R11、R13With I it is known that I can be obtained according to formula (5), (6) and (7)3、I4With I5。
In addition, because the third branch, the 4th branch are connect with the 5th branch circuit parallel connection, then three branches two
The voltage at end is equal, it may be assumed that
I3(R11+R12)=I4(R13+R21)=I5(R14+R22) (8)
Because of R14、R11、R13With R12It is known that the I that will be calculated3、I4With I5Substitution formula (8) can be obtained the first temperature and pass
The resistance value R of sensor21With the resistance value R of second temperature sensor22。
Relative to the sample circuit 20 that the first branch and second branch form, present embodiment is by increasing the described 11st
The third branch that the resistance R11 and twelfth resistor R12 is constituted, can increase loop current, electric current is made to be easier to control
System, to reduce current source output current error, improves the accuracy of detection.
According to formula (6) and formula (7) it is found that the third detection signal and it is described 4th detection signal only with eleventh resistor
R11, thirteenth resistor R13 are related with the 14th resistance R14, with 42 nothing of the first temperature sensor 41 and second temperature sensor
It closes, therefore regulating allocation resistance, eleventh resistor R11, thirteenth resistor R13 and the 14th resistance R14, to adjust can be passed through
The size of sampled voltage reduces sampling error to guarantee that pressure difference is sufficiently large.
In a specific embodiment, first difference unit 31 includes: third amplifier AMP3, the 15th resistance
R15, the 16th resistance R16, the 17th resistance R17, the 18th resistance R18, the 19th resistance R19, the 20th resistance R20,
Three capacitor C3, the 4th capacitor C4, the 5th capacitor C5, the 6th capacitor C6 and the 7th capacitor C7；One end of 15th resistance R15 connects
The non-inverting input terminal of first difference unit 31, the other end connect the third amplifier AMP3's by the 16th resistance R16
Non-inverting input terminal；One end of third capacitor C3 is connect with the 15th resistance R15 and the 16th resistance R16, the other end
It is grounded GND；One end of 17th resistance R17 connects the inverting input terminal of first difference unit 31, and the other end passes through the tenth
Eight resistance R18 connect the inverting input terminal of the third amplifier AMP3；One end of 4th capacitor C4 and the 17th resistance R17
It is connected with the 18th resistance R18, the other end is grounded GND；One end of 5th capacitor C5 connects the third amplifier AMP3's
Non-inverting input terminal, the other end connect the inverting input terminal of the third amplifier AMP3；Described in one end connection of 19th resistance R19
The inverting input terminal of third amplifier AMP3, the other end connect the output end of the third amplifier AMP3；6th capacitor C6 with it is described
19th resistance R19 is connected in parallel；The non-inverting input terminal of the third amplifier AMP3 is grounded GND by the 20th resistance R20；The
Seven capacitor C7 are connected in parallel with the 20th resistance R20；The output end of the third amplifier AMP3 connects first difference
The output end of unit 31.
By setting third capacitor C3, the 4th capacitor C4, the 7th capacitor C7 and the 6th capacitor C6, described first can be improved
The common-mode rejection ratio of difference unit 31 can be improved 31 differential mode of the first difference unit and inhibit by the way that the 5th capacitor C5 is arranged
Than, and then improve the precision of the calculus of differences circuit 30.
Optionally, first difference unit 31 further includes the 23rd resistance R23, the 8th capacitor C8, the second diode
D2 and third diode D3；One end of the 23rd resistance R23 connects the output end of the third amplifier AMP3, the other end
Connect external circuit；One end of the 8th capacitor C8 is grounded GND, and the other end connects external circuit；The second diode D2
Anode and the cathode of the third diode D3 connect with external circuit, the cathode of the second diode D2 connects power supply
VCC, the plus earth GND of the third diode D3.
It, can be to the output voltage of first difference unit 31 by the way that the second diode D2 and third diode D3 is arranged
It is limited.
The utility model embodiment also provides charging gun, including gun body and pipette tips, which is characterized in that further includes any of the above-described
Charging gun temperature sensing circuit described in.
Charging gun provided by the embodiment of the utility model can be supervised accurately by the way that the charging gun temperature sensing circuit is arranged
Charging gun temperature is controlled, the generation of the accidents such as charging equipment spontaneous combustion, on fire in charging process is avoided.
Term " first ", " second " be used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or
Implicitly indicate the quantity of indicated technical characteristic." first " is defined as a result, the feature of " second " can be expressed or imply
Ground includes one or more of the features.In the description of the present invention, the meaning of " plurality " is two or more,
Unless otherwise specifically defined.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Made any modifications, equivalent replacements, and improvements etc., should be included in the utility model within the spirit and principle of utility model
Protection scope within.
Claims (10)
1. charging gun temperature sensing circuit characterized by comprising sample circuit, calculus of differences circuit and setting are being charged
Temperature-detecting device inside rifle pipette tips；
The temperature-detecting device for detecting the temperature inside charging gun pipette tips, and generates voltage signal；
The sample circuit is connect with the temperature-detecting device, for sampling the voltage signal and by the voltage signal
It is sent to the calculus of differences circuit；
The calculus of differences circuit generates detection signal for handling the voltage signal, and by the detection signal
It is sent to external circuit.
2. charging gun temperature sensing circuit according to claim 1, which is characterized in that the charging gun temperature sensing circuit
Further include: current source circuit；
The current source circuit, for powering to the sample circuit and the temperature-detecting device.
3. charging gun temperature sensing circuit according to claim 2, which is characterized in that the current source circuit includes: electricity
Press input, output end, feedback end, the first amplifier, the second amplifier, first resistor, second resistance, 3rd resistor, the 4th resistance,
5th resistance, the 6th resistance and first diode；
One end of first resistor connects the voltage input end, and the other end connects the inverting input terminal of first amplifier；
One end of second resistance connects the inverting input terminal of first amplifier, and the other end connects the output of second amplifier
End；
One end of 3rd resistor connects the output end of first amplifier, and the other end connects the homophase input of first amplifier
End；
The non-inverting input terminal of first amplifier is grounded；
One end of 4th resistance connects the output end of first amplifier, and the other end passes through the first diode and the output
The anode of end connection, the first diode connects the output end；
One end of 5th resistance connects the inverting input terminal of second amplifier, other end ground connection；
One end of 6th resistance is grounded, and the other end is connect with the non-inverting input terminal of second amplifier and the feedback end；
The inverting input terminal of first amplifier is electrically connected with the output end of first amplifier；
The inverting input terminal of second amplifier is electrically connected with the output end of second amplifier；
The output end is connect with the sample circuit respectively with the feedback end.
4. charging gun temperature sensing circuit according to claim 3, which is characterized in that the current source circuit further include:
First capacitor, the second capacitor, the 7th resistance and the 8th resistance；
One end of 7th resistance connects the inverting input terminal of first amplifier, and the other end connects the output of first amplifier
End；
First capacitor is connect with the 7th resistor coupled in parallel；
One end of 8th resistance connects the inverting input terminal of second amplifier, and the other end connects the output of second amplifier
End；
Second capacitor is connect with the 8th resistor coupled in parallel.
5. charging gun temperature sensing circuit according to claim 1, which is characterized in that the sample circuit includes: the 9th
Resistance and the tenth resistance；The temperature-detecting device includes the first temperature sensor and second temperature sensor；
One end of 9th resistance and one end of the tenth resistance are connected to the first sampled point, and the other end of the 9th resistance connects institute
One end of the first temperature sensor is stated, the other end of first temperature sensor and one end of the second temperature sensor connect
It is connected to the second sampled point, the other end of the tenth resistance and the other end of the second temperature sensor are connected to third sampling
Point；
First sampled point and second sampled point are respectively used to connect with current source circuit；
First sampled point, second sampled point and the third sampled point respectively with the calculus of differences circuit connection.
6. charging gun temperature sensing circuit according to claim 5, which is characterized in that the calculus of differences circuit includes:
First difference unit and the second difference unit；
The non-inverting input terminal of first difference unit connects second sampled point, inverting input terminal connection first sampling
The output end of point, first difference unit connects external circuit；
The non-inverting input terminal of second difference unit connects first sampled point, and inverting input terminal connects the third sampling
The output end of point, second difference unit connects external circuit.
7. charging gun temperature sensing circuit according to claim 1, which is characterized in that the sample circuit includes: the tenth
One resistance, twelfth resistor, thirteenth resistor and the 14th resistance；The temperature-detecting device include the first temperature sensor with
Second temperature sensor；
One end of eleventh resistor and one end of thirteenth resistor and one end of the 14th resistance are connected to the first tie point；Tenth
One end of one end of two resistance, one end of the first temperature sensor and second temperature sensor is connected to the second tie point；It is described
The other end of eleventh resistor and the other end of the twelfth resistor are connected to the 4th sampled point；13 resistance it is another
End and the other end of first temperature sensor are connected to the 5th sampled point；The other end of 14th resistance and described the
The other end of two temperature sensors is connected to the 6th sampled point；
First tie point is respectively used to connect with current source circuit with second tie point；
4th sampled point, the 5th sampled point and the 6th sampled point respectively with the calculus of differences circuit connection.
8. charging gun temperature sensing circuit according to claim 7, which is characterized in that the calculus of differences circuit includes:
First difference unit and the second difference unit；
The non-inverting input terminal of first difference unit connects the 5th sampled point, inverting input terminal connection the 4th sampling
The output end of point, first difference unit connects external circuit；
The non-inverting input terminal of second difference unit connects the 6th sampled point, inverting input terminal connection the 4th sampling
The output end of point, second difference unit connects external circuit.
9. the charging gun temperature sensing circuit according to claim 6 or 8, which is characterized in that the first difference unit packet
It includes: third amplifier, the 15th resistance, the 16th resistance, the 17th resistance, the 18th resistance, the 19th resistance, the 20th electricity
Resistance, third capacitor, the 4th capacitor, the 5th capacitor, the 6th capacitor and the 7th capacitor；
One end of 15th resistance connects the non-inverting input terminal of first difference unit, and the other end is connected by the 16th resistance
The non-inverting input terminal of the third amplifier；One end of third capacitor is connect with the 15th resistance and the 16th resistance,
Other end ground connection；
One end of 17th resistance connects the inverting input terminal of first difference unit, and the other end is connected by the 18th resistance
The inverting input terminal of the third amplifier；One end of 4th capacitor is connect with the 17th resistance and the 18th resistance,
Other end ground connection；
One end of 5th capacitor connects the non-inverting input terminal of the third amplifier, and the reverse phase that the other end connects the third amplifier is defeated
Enter end；
One end of 19th resistance connects the inverting input terminal of the third amplifier, and the other end connects the output of the third amplifier
End；6th capacitor is connect with the 19th resistor coupled in parallel；The non-inverting input terminal of the third amplifier is connect by the 20th resistance
Ground；7th capacitor is connect with the 20th resistor coupled in parallel；
The output end of the third amplifier connects the output end of first difference unit.
10. charging gun, including gun body and pipette tips, which is characterized in that further include the described in any item charging gun temperature of claim 1-9
Spend detection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821460027.9U CN209055243U (en) | 2018-09-06 | 2018-09-06 | Charging gun temperature sensing circuit and charging gun |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821460027.9U CN209055243U (en) | 2018-09-06 | 2018-09-06 | Charging gun temperature sensing circuit and charging gun |
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| Publication Number | Publication Date |
|---|---|
| CN209055243U true CN209055243U (en) | 2019-07-02 |
Family
ID=67048398
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821460027.9U Active CN209055243U (en) | 2018-09-06 | 2018-09-06 | Charging gun temperature sensing circuit and charging gun |
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| CN (1) | CN209055243U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110940881A (en) * | 2019-12-10 | 2020-03-31 | 许昌开普检测研究院股份有限公司 | Charging temperature rise test system |
| CN112018842A (en) * | 2020-08-01 | 2020-12-01 | 浙江晨泰科技股份有限公司 | Charger control system capable of prolonging service life of battery and having automatic compensation function |
| CN114112096A (en) * | 2021-11-11 | 2022-03-01 | 福建星云电子股份有限公司 | High-precision charging gun temperature acquisition device and method |
-
2018
- 2018-09-06 CN CN201821460027.9U patent/CN209055243U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110940881A (en) * | 2019-12-10 | 2020-03-31 | 许昌开普检测研究院股份有限公司 | Charging temperature rise test system |
| CN112018842A (en) * | 2020-08-01 | 2020-12-01 | 浙江晨泰科技股份有限公司 | Charger control system capable of prolonging service life of battery and having automatic compensation function |
| CN114112096A (en) * | 2021-11-11 | 2022-03-01 | 福建星云电子股份有限公司 | High-precision charging gun temperature acquisition device and method |
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Address after: 518000 room 118, 1 Kang Hesheng building, 1 Chuang Sheng Road, Xili street, Nanshan District, Shenzhen, Guangdong. Patentee after: SHENZHEN KEHUA HENGSHENG TECHNOLOGY Co.,Ltd. Patentee after: XIAMEN KEHUAHENGSHENG LIMITED BY SHARE Ltd. Address before: 518000 room 118, 1 Kang Hesheng building, 1 Chuang Sheng Road, Xili street, Nanshan District, Shenzhen, Guangdong. Patentee before: SHENZHEN KEHUA HENGSHENG TECHNOLOGY Co.,Ltd. Patentee before: XIAMEN KEHUA HENGSHENG Co.,Ltd. |
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