CN109506802A - A kind of reactor temperature sensing circuit - Google Patents
A kind of reactor temperature sensing circuit Download PDFInfo
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- CN109506802A CN109506802A CN201811453656.3A CN201811453656A CN109506802A CN 109506802 A CN109506802 A CN 109506802A CN 201811453656 A CN201811453656 A CN 201811453656A CN 109506802 A CN109506802 A CN 109506802A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/18—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer
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Abstract
A kind of reactor temperature sensing circuit, including temperature collecting module, filter module, division module, light-coupled isolation module, operational amplifying module and operation control module.The temperature collecting module is used to temperature signal being converted to voltage signal；The filter module is for higher hamonic wave in filtering circuit；Low-pass filter output voltage is lifted and is sent into light-coupled isolation module by the division module；The light-coupled isolation module is isolated by external circuit and circuit board control circuit；The operational amplifying module is used for amplifying circuit signal；The control computing module receives operational amplifying module output voltage, and carries out calculation processing to it and obtain true reactor temperature value.The temperature sensing circuit can be used for various complicated.
Description
Technical field
The present invention relates to a kind of reactor temperature sensing circuits.
Background technique
Large power energy storage current transformer is the important equipment for playing interface between battery group and power grid in micro-capacitance sensor, can be real
Existing energy two-way exchange.Stable energy accumulation current converter is the basis of micro-grid system stable operation, each first device of energy accumulation current converter
Part needs work within the temperature range of permission, due to the difference of working environment and the difference of operational mode, energy accumulation current converter
Own temperature and environment temperature can vary widely, but this is not permitted in equipment stable operation.And accurately temperature is examined
It surveys and temperature controls and provides solid guarantee for the normal and stable operation of equipment and system.
There are many places temperature detecting points inside current transformer, mainly include in-cabinet temperature, IGBT temperature and reactor temperature.
Due to the difference of current transformer operating mode, the working condition of internal reactor changes therewith, and itself meeting when reactor operation
Various harmonic wave interferences are generated, the accuracy of reactor temperature sampling has been seriously affected.
Meanwhile in normal operating conditions, reactor itself can bear high voltage, since temperature detecting point is in reactance
Inside device, high voltage influences the stable operation of main control loop possibly through temperature detection line.
Currently, simple detected value of the detection circuit under high pressure strong interference environment is inaccurate, temperature inspection is even resulted in
It surveys and temperature control fails.
Summary of the invention
The purpose of the present invention is overcoming the prior art, a kind of reactor temperature sensing circuit is proposed.The present invention can
The harmonic wave interference outside detection circuit is reduced, major loop and control loop is isolated, protects rear class control circuit and temperature detection
Precision is high.
To achieve the above object, the invention provides the following technical scheme:
A kind of reactor temperature sensing circuit, comprising: temperature collecting module, filter module, division module, light-coupled isolation mould
Block, operational amplifying module.First output end of the temperature collecting module is connected with the first input end of filter module, and temperature is adopted
The second output terminal of collection module is connected with the second input terminal of filter module.The first output end and partial pressure mould of the filter module
The first input end of block connects, and the second output terminal of filter module is connected with the second input terminal of division module.The partial pressure mould
First output end of block is connected with the first differential input end of light-coupled isolation module, the second output terminal of division module and optocoupler every
The second differential input end connection from module.The of first difference output end of the light-coupled isolation module and operational amplifying module
The connection of two differential input ends, the second output terminal of light-coupled isolation module are connected with the first differential input end of operational amplifying module.
The output end of the operational amplifying module is connected with the input terminal of operation control module.The operation control module is last operation
Processing module, the sampled voltage of processing operational amplifying module output.
The temperature collecting module is used to for reactor interior temperature signal being converted into voltage signal, and exports the first sampling
Voltage and the second sampled voltage are to filter module；
The filter module uses RC low-pass filter, for filtering out in the first sampled voltage and the second sampled voltage signal
Higher hamonic wave, respectively obtain the first reference voltage and the second reference voltage, and be output to division module；
The division module accepts filter module output, and the first reference voltage and the second reference voltage is carried out at partial pressure
Light-coupled isolation module is exported after reason.
The light-coupled isolation module is isolated by external signal and circuit board signal, receives the first of division module output
Two voltages are amplified 8 times as differential input signal and output difference output signals to fortune by reference voltage and the second reference voltage
Calculate amplification module；
The operational amplifying module be used for amplifying circuit signal, receive light-coupled isolation module output difference signal, by its into
10 times of row are amplified and export sampled voltage signal to operation control module；
The control computing module receives operational amplifying module and exports sampled voltage, and carries out calculation processing to it and obtain very
Real temperature value.
The temperature collecting module includes: PT100 sampling resistor, first resistor, second resistance, 3rd resistor and 4V electricity
Source；
The PT100 sampling resistor is placed in inside reactor line packet, and is grounded by shielding line one end, another termination first
Resistance.PT100 sampling resistor resistance value varies with temperature and changes, and the resistance for the temperature signal of variation to be converted to variation hinders
Value；
One termination 4V power supply of the first resistor, another termination PT100 resistance constitute the first branch.3rd resistor
One end ground connection, another termination second resistance, another termination 4V power supply of second resistance constitute second branch.
The filter circuit uses two RC low-pass filter circuits.One end of 4th resistance is connect with PT100 sampling resistor,
The other end of 4th resistance is connect with first capacitor, and first capacitor other end ground connection constitutes the first filter circuit.5th resistance
One end is connect with 3rd resistor, the other end and the second capacitance connection of the 5th resistance, the other end of the second capacitor ground connection, constitutes the
Two filter circuits.
The bleeder circuit includes two divider resistances: the 6th resistance and the 7th resistance.One termination the 4th of the 6th resistance
Resistance, the other end ground connection of the 6th resistance, constitutes the first bleeder circuit.One the 5th resistance of termination of the 7th resistance, the 7th resistance
The other end ground connection constitute the second bleeder circuit.
The isolation optocoupler module uses linear optical coupling.The 5V that two power pins of linear optical coupling are isolated by two respectively
Power supply power supply.First Differential Input of linear optical coupling connects one end of the 6th resistance, and the second Differential Input connects the 7th resistance
One end.Two ground terminals of linear optical coupling are separately connected two isolator.Linear optical coupling carries out 8 times to differential input signal and puts
It is big and poor exported by difference output pin.
The operational amplifying module includes: the first amplifier, the 8th resistance, the 9th resistance, the tenth resistance and eleventh resistor.
The reverse input end of first amplifier is connected with the second difference output of linear optical coupling by the 8th resistance, the first amplifier it is in the same direction defeated
Enter end to connect by the 9th resistance with the first difference output of linear optical coupling.One end of tenth resistance is in the same direction defeated with the first amplifier
Enter end connection, the other end ground connection of the tenth resistance.The reverse input end of the first amplifier of one end connection of eleventh resistor, the 11st
The other end of resistance is connect with the output end of the first amplifier.
Under the conditions of reactor temperature sensing circuit provided by the invention has the advantages that circuit is simplified, filters out outside and adopt
The higher hamonic wave of sample circuit provides stable sampled signal, and influence of the external forceful electric power to subsequent control circuit is isolated, protects rear class
Circuit, and finally ensure that the accuracy of temperature detection.
Detailed description of the invention
Fig. 1 is reactor temperature sensing circuit schematic diagram；
Fig. 2 is PT100 phasing meter.
Specific embodiment
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, reactor temperature sensing circuit of the present invention includes: temperature collecting module 1, filter module 2, partial pressure mould
Block 3, light-coupled isolation module 4, operational amplifying module 5, operation control module 6.
First output end of the temperature collecting module 1 is connected with the first input end of filter module 2, temperature collecting module
1 second output terminal is connected with the second input terminal of filter module 2.The first output end and division module 3 of the filter module 2
First input end connection, the second output terminal of filter module 2 connects with the second input terminal of division module 3.The partial pressure mould
First output end of block 3 is connected with the first differential input end of light-coupled isolation module 4, the second output terminal and light of division module 3
Second differential input end of coupling isolation module 4 connects.The first difference output end and operation amplifier mould of the light-coupled isolation module 4
Second differential input end of block 5 connects, and the second output terminal of light-coupled isolation module 4 and the first difference of operational amplifying module 5 are defeated
Enter end connection.The output end of the operational amplifying module 5 is connected with 6 input terminal of operation control module.
The temperature collecting module 1 is used to for reactor interior temperature signal being converted into voltage signal, and exports first and adopt
Sample voltage and the second sampled voltage are to filter module 2；
The filter module 2 uses RC low-pass filter, for filtering out the first sampled voltage and the second sampled voltage signal
In higher hamonic wave, respectively obtain the first reference voltage and the second reference voltage and be output to division module 3；
The division module 3 accepts filter the first and second reference voltages of the output of module 2, by the first reference voltage and the
Two reference voltages are output to light-coupled isolation module 4 after carrying out voltage division processing.
The light-coupled isolation module 4 is isolated by external signal and circuit board signal, receives division module 3 exports the
Two voltages are amplified 8 times as differential input signal and output difference are output signals to by one reference voltage and the second reference voltage
Operational amplifying module 5；
The operational amplifying module 5 is used for amplifying circuit signal, and 4 output difference output signal conduct of optical coupling module is stated in reception
Input, is carried out 10 times and amplifies and export sampled voltage signal to operation control module 6；
The operation control module 6 receives operational amplifying module 5 and exports sampled voltage signal, and signal operation is handled to obtain
True temperature value.
The temperature collecting module includes: PT100 sampling resistor, first resistor, second resistance, 3rd resistor and 4V electricity
Source；
The PT100 sampling resistor is placed in inside reactor line packet, and is grounded by shielding line one end, another termination first
Resistance R1, PT100 sampling resistor resistance value varies with temperature and changes, for the temperature signal of variation to be converted to the resistance of variation
Resistance value；
A termination 4V power supply of the first resistor R1, another termination PT100 resistance constitute the first branch.3rd resistor
One end of R3 is grounded, another termination second resistance R2, and the other end and 4V power supply of second resistance connect and compose second branch.
The resistance signal of variation is converted into the output of the first sampled voltage by the first branch, second branch output fixation
Second sampled voltage V21, two output voltage meets following relationship:
In above formula, V11Indicate the first sampled voltage, V21Indicate the second sampled voltage.
The first sampled voltage V11With the second sampled voltage V21Into filter module 2, low-pass filtering is carried out.
The filter module 2 uses two RC low-pass filter circuits.One end of 4th resistance R4 and PT100 sampling resistor connect
It connects, the other end of the 4th resistance R4 is connect with first capacitor C1, and the other end ground connection of first capacitor C1 constitutes the first filtered electrical
Road.One end of 5th resistance R5 is connect with 3rd resistor R3, and the other end of the 5th resistance R5 is connect with the second capacitor C2, the second electricity
The other end ground connection for holding C2, constitutes the second filter circuit.Two filter circuit cutoff frequencies are identical, are as follows:
In above formula, w is low pass filter cutoff frequency, R4=1K, C1=1uF, then w=159.2Hz.
Filtered voltage passes through division module 3.The division module 3 include two divider resistances: the 6th resistance R6 and
7th resistance R7.The other end ground connection of termination a 4th resistance R4, the 6th resistance R6 of 6th resistance R6, constitutes the first partial pressure electricity
Road.The other end ground connection of termination a 5th resistance R5, the 7th resistance R7 of 7th resistance R7 constitutes the second bleeder circuit；
6th resistance R6 and the 7th resistance R7 is 1M ohm, R6 > > R4, and R7 > > R5, is approximately considered by division module
The voltage for entering light-coupled isolation module 4 after 3 meets following relationship:
V12=V11 (4)
V22=V21 (5)
In above formula, V12And V22Respectively the first reference voltage and the second reference voltage.
The light-coupled isolation module 4 uses linear optical coupling U1, takes differential signal input and output, and inputting is high impedance,
The undistorted mV grades of AC and DC signals of transmitting of energy, can be effectively isolated external circuit and internal control circuit, and realize reliable and stable
Earth signal transmitting.The 5V power supply power supply that two power pins 1 and pin 8 of linear optical coupling U1 are isolated by two respectively.Linear light
The first Differential Input pin 2 of coupling U1 meets the 6th resistance R6, and the second Differential Input pin 3 meets the 7th resistance R7.Linear optical coupling U1
Two grounding pins 4 and pin 5 be separately connected two isolator.Linear optical coupling U1 carries out 8 times of amplifications to differential input signal
And exported by difference output pin 6 and pin 7, input/output relation is as follows:
V13-V23=8* (V12-V22) (6)
In above formula, V13And V23For the differential output signal of light-coupled isolation module 4.
The operational amplifying module 5 include: the first amplifier U2D, the 8th resistance R8, the 9th resistance R9, the tenth resistance R10 and
Eleventh resistor R11.The reverse input end of first amplifier U2D passes through the difference output pin 6 of the 8th resistance R8 and linear optical coupling
The noninverting input of connection, the first amplifier U2D is connected by the difference output pin 7 of the 9th resistance R9 and linear optical coupling.Tenth
One end of resistance R10 is connect with the positive input of the first amplifier U2D, the other end ground connection of the tenth resistance R10.Eleventh resistor
One end of R11 connects the reverse input end of the first amplifier U2D, the other end of eleventh resistor R11 and the first amplifier U2D output end
Connection.The input voltage of operational amplifying module 5 is V13And V23, by amplifier void, short, resolution can be obtained:
In above formula, VoutFor sampled voltage.R8=R9=1K, R11=R10=10K in the operational amplification circuit, by formula
(7) it can obtain:
Vout=10* (V13-V23) (8)
Joint type (1), formula (2), formula (6) and formula (8) can obtain sampled voltage VoutWith PT100 sampling resistor RPT100Between close
It is as follows:
It can be obtained according to above formula (9):
RPT100=16.25*Vout+100 (10)
Operation control module 6 receives sampled voltage Vout, and PT100 sampling resistor R is acquired by formula (10)PT100Corresponding resistance
Value, PT100 phasing meter obtains the corresponding temperature value of current resistance according to fig. 2, so that it is determined that the actual temperature value of reactor.
Claims (6)
1. a kind of reactor temperature sensing circuit, which is characterized in that the reactor temperature sensing circuit includes: temperature acquisition
Module (1), filter module (2), division module (3), light-coupled isolation module (4), operational amplifying module (5) and operation control module
(6)；First output end of the temperature collecting module (1) is connected with the first input end of filter module (2), temperature collecting module
(1) second output terminal is connected with the second input terminal of filter module (2)；First output end of the filter module (2) and point
The first input end of die block (3) connects, and the second output terminal of filter module (2) and the second input terminal of division module (3) connect
It connects；First output end of the division module (3) is connected with the first differential input end of light-coupled isolation module (4), division module
(3) second output terminal is connected with the second differential input end of light-coupled isolation module (4)；The of the light-coupled isolation module (4)
One difference output end is connected with the second differential input end of operational amplifying module (5), the second output terminal of light-coupled isolation module (4)
It is connected with the first differential input end of operational amplifying module (5)；The output end and operation control mould of the operational amplifying module (5)
The input terminal of block (6) connects；
Temperature signal is converted into voltage signal by the temperature collecting module (1), and exports the first sampled voltage and the second sampling
Voltage is to filter module (2)；The filter module (2) uses RC low-pass filter, for filtering out the first sampled voltage and second
Higher hamonic wave in sampled voltage signal respectively obtains the first reference voltage and the second reference voltage and is output to division module
(3)；The division module (3) accept filter module (2) output the first reference voltage and the second reference voltage, by first reference
Voltage and the second reference voltage are output to light-coupled isolation module (4) after carrying out voltage division processing；The light-coupled isolation module (4) will be outer
Portion's signal and circuit board signal are isolated, and the first reference voltage and the second reference voltage of division module (3) output are received, will
Two voltages amplify 8 times as differential input signal and output difference outputs signals to operational amplifying module (5)；The operation amplifier
Module (5) is used for amplifying circuit signal, and reception states optical coupling module (4) output difference output signal as input, carried out 10
Amplify again and exports sampled voltage signal to operation control module (6)；The operation control module (6) receives operational amplifying module
(5) the sampled voltage signal exported, signal operation is handled to obtain reactor temperature value.
2. reactor temperature sensing circuit described in accordance with the claim 1, which is characterized in that temperature collecting module (1) packet
Include PT100 sampling resistor, first resistor (R1), second resistance (R2), 3rd resistor (R3) and 4V power supply；The PT100 sampling
Resistance RPT100It is placed in inside reactor line packet, and be grounded by shielding line one end, another termination first resistor R1；PT100 sampling
Resistance RPT100Resistance value vary with temperature and change, for the temperature signal of variation to be converted to the resistance of variation；It is described
One termination 4V power supply of first resistor (R1), another termination PT100 sampling resistor constitute the first branch；3rd resistor (R3)
One end ground connection, the other end are connect with second resistance (R2), and the other end of second resistance (R2) is connect with 4V power supply, constitute second
Road；
The resistance signal of variation is converted into the first sampled voltage V by the first branch11Output, second branch output it is fixed the
Two sampled voltage V21, two output voltage meets following relationship:
In above formula, V11Indicate the first sampled voltage, V21Indicate the second sampled voltage.
3. reactor temperature sensing circuit described in accordance with the claim 1, which is characterized in that the filter module (2) uses two
A RC low-pass filter circuit；One end of 4th resistance (R4) and PT100 sampling resistor RPT100Connection, the 4th resistance (R4) it is another
End is connect with first capacitor (C1), and the other end ground connection of first capacitor (C1) constitutes the first filter circuit；5th resistance (R5)
One end is connect with 3rd resistor (R3), and the other end of the 5th resistance (R5) is connect with the second capacitor (C2), the second capacitor (C2)
Other end ground connection, constitutes the second filter circuit；Two filter circuit cutoff frequencies are identical, are as follows:
In above formula, w is low pass filter cutoff frequency, R4=1K, C1=1uF, then w=159.2Hz.
4. reactor temperature sensing circuit described in accordance with the claim 1, which is characterized in that the bleeder circuit includes two points
Piezoresistance: the 6th resistance (R6) and the 7th resistance (R7)；One the 4th resistance (R4) of termination of the 6th resistance (R6), the 6th resistance
(R6) other end ground connection, constitutes the first bleeder circuit；One the 5th resistance (R5) of termination of the 7th resistance (R7), the 7th resistance
(R7) other end ground connection.Constitute the second bleeder circuit；
6th resistance (R6) and the 7th resistance (R7) are 1M ohm, R6 > > R4, and R7 > > R5, are approximately considered by division module
(3) voltage for entering light-coupled isolation module (4) after meets following relationship:
V12=V11 (4)
V22=V21 (5)
In above formula, V12For the first reference voltage, V22For the second reference voltage.
5. reactor temperature sensing circuit described in accordance with the claim 1, which is characterized in that the isolation optocoupler module (4) is adopted
With linear optical coupling U1；The 5V power supply power supply that two power pins 1 and pin 8 of linear optical coupling U1 are isolated by two respectively；Linearly
The first Differential Input pin 2 of optocoupler U1 connects the 6th resistance (R6), and the second Differential Input pin 3 connects the 7th resistance (R7)；Linearly
Two grounding pins 4 and pin 5 of optocoupler U1 are separately connected two isolator；Linear optical coupling U1 carries out 8 to differential input signal
Amplify again, and exported by difference output pin 6 and pin 7, input/output relation is as follows:
V13-V23=8* (V12-V22) (6)
In above formula, V13And V23For the differential output signal of light-coupled isolation module 4.
6. reactor temperature sensing circuit described in accordance with the claim 1, which is characterized in that operational amplifying module (5) packet
It includes: the first amplifier U2D, the 8th resistance (R8), the 9th resistance (R9), the tenth resistance (R10) and eleventh resistor (R11)；First
The reverse input end of amplifier U2D is connected by the difference output pin 6 of the 8th resistance (R8) and linear optical coupling, the first amplifier U2D
The noninverting input connection of difference output pin 7 that passes through the 9th resistance (R9) and linear optical coupling；One end of tenth resistance (R10)
It is connect with the positive input of the first amplifier U2D, the other end ground connection of the tenth resistance (R10)；One end of eleventh resistor (R11)
The reverse input end of the first amplifier U2D is connected, the other end of eleventh resistor (R11) is connect with the first amplifier U2D output end；Fortune
The input voltage for calculating amplification module (5) is V13And V23, by amplifier void, short, resolution can be obtained:
In above formula, VoutFor sampled voltage；
R8=R9=1K, R11=R10=10K in the operational amplification circuit can be obtained by formula (7):
Vout=10* (V13-V23) (8)
Joint type (1), formula (2), formula (6) and formula (8) obtain sampled voltage VoutWith PT100 sampling resistor RPT100Between relationship such as
Under:
It can be obtained according to above formula (9):
RPT100=16.25*Vout+100 (10)
The operation control module (6) receives sampled voltage Vout, and PT100 sampling resistor R is acquired by formula (10)PT100It is right
Resistance value is answered, the corresponding temperature value of current resistance is obtained further according to PT100 sampling resistor phasing meter, so that it is determined that actual electricity
Anti- device temperature value.
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| CN201811453656.3A CN109506802A (en) | 2018-11-30 | 2018-11-30 | A kind of reactor temperature sensing circuit |
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| CN201811453656.3A CN109506802A (en) | 2018-11-30 | 2018-11-30 | A kind of reactor temperature sensing circuit |
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Family
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| CN201811453656.3A Pending CN109506802A (en) | 2018-11-30 | 2018-11-30 | A kind of reactor temperature sensing circuit |
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| CN114681044A (en) * | 2020-12-31 | 2022-07-01 | 杭州德晋医疗科技有限公司 | Temperature detection device and radio frequency ablation system |
| CN117589323A (en) * | 2024-01-19 | 2024-02-23 | 常州通宝光电股份有限公司 | High-voltage isolation area temperature acquisition circuit |
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| CN110212510A (en) * | 2019-07-15 | 2019-09-06 | 北京精密机电控制设备研究所 | A kind of multipath is comprehensive to rise circuit from inhibition busbar voltage pump |
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