CN106289560A - A kind of circuit for motor temperature Precision measurement - Google Patents
A kind of circuit for motor temperature Precision measurement Download PDFInfo
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- CN106289560A CN106289560A CN201610622703.7A CN201610622703A CN106289560A CN 106289560 A CN106289560 A CN 106289560A CN 201610622703 A CN201610622703 A CN 201610622703A CN 106289560 A CN106289560 A CN 106289560A
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K2205/00—Application of thermometers in motors, e.g. of a vehicle
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Abstract
The invention provides a kind of circuit for motor temperature Precision measurement, it is connected with bleeder circuit including the bleeder circuit of external sensor input interface, one end and differential amplifier circuit that the other end is connected with circuit output interface and the constant-current circuit that is connected with bleeder circuit, bleeder circuit includes pull-up resistor, differential amplifier circuit includes the first operational amplifier, the first differential amplification resistance, the second differential amplification resistance and current-limiting resistance etc., and constant-current circuit includes that electric current adjusts pipe, the second operational amplifier, filtering dividing potential drop group, current sampling resistor etc..The circuit for motor temperature Precision measurement of the application present invention, whole system is simplified, and can complete the collection to motor temperature；The design of differential amplifier circuit can be used for amplifying difference mode signal and the suppression to common-mode signal, improves circuit anti-interference performance；Breaking line preventive circuit can ensure that constant-current circuit is set up；The temperature-compensation circuit temperature drift phenomenon that each parts occur because of the change by ambient temperature in suppression circuit system.
Description
Technical field
The present invention relates to technical field of motors, be specifically related to a kind of circuit for motor temperature Precision measurement.
Background technology
In electric automobile, electric machine controller temperature sampling, for the sampling of NTC or PTC sensor, major part uses electricity
Resistance partial pressure type circuit.Electric resistance partial pressure type circuit structure is simple, refers to Fig. 1, specifically: the negative pole of external sensor input interface with
Analog power ground connects, and the positive pole of external sensor input interface is connected with the first end of resistor voltage divider circuit, electric resistance partial pressure electricity
Second end on road is connected with circuit output interface, and resistor voltage divider circuit includes operational amplifier 1-1, is arranged on the external sensing of connection
The first resistance 1-2 on the circuit of the positive pole of device input interface and the in-phase input end of operational amplifier 1-1, it is arranged on connection electricity
The second resistance 1-3 on the circuit of the outfan of road output interface and operational amplifier 1-1, one end are arranged on the external sensing of connection
On the positive pole of device input interface and the circuit of the first resistance 1-2 and the pull-up resistor R1-4 of other end connection system working power,
One end is arranged on the circuit of positive pole and the first resistance 1-2 connecting external sensor input interface and the other end connects simulation electricity
The first electric capacity 1-5 in seedbed and one end are arranged on the circuit connecting circuit output interface and the second resistance 1-3 and the other end
Connect the second electric capacity 1-6 on analog power ground, also include the 3rd electric capacity 1-7 etc..
Using foregoing circuit, its principle is: when ambient temperature changes, and the resistance of temperature sensor also can become
Change, thus the magnitude of voltage obtained, by tabling look-up, can convert and obtain the temperature value of Current Temperatures sensor.
Use aforesaid way, have the disadvantage that owing to temperature sensor is the element of resistance variations, in hot environment
In, resistance is understood variation with temperature and is changed, and by the electric current of temperature sensor, can make temperature sensor self-heating, makes
Obtaining self resistance variations, therefore current value also can change, thus affects the stability of circuit, i.e. samples inaccurate, and temperature is floated
Move and precision is relatively low, thus affect the job stability of electric machine controller.
Summary of the invention
Present invention aim at providing a kind of structure to simplify, good stability and temperature acquisition degree of accuracy high (can reach ±
0.1 DEG C) the circuit for motor temperature Precision measurement, concrete technical scheme is as follows:
A kind of circuit for motor temperature Precision measurement, including bleeder circuit, one end of external sensor input interface
The differential amplifier circuit that is connected with circuit output interface with described dividing potential drop connection and the other end and with described dividing potential drop circuit
The constant-current circuit connected；
Described bleeder circuit includes being separately positioned on connection external sensor input interface positive pole and negative pole and equal and mould
Intend the first filter capacitor that power supply ground connects and the second filter capacitor and one end connect external sensor input interface positive pole and
The pull-up resistor of other end connection system working power；
Described differential amplifier circuit includes that one end connects described bleeder circuit and the other end and connects the of circuit output interface
One operational amplifier, be separately positioned on external sensor input interface positive pole and negative pole and all with described first operational amplifier
It is the 3rd poor that the first differential amplification resistance connected and the second differential amplification resistance and described first operational amplifier are arranged in parallel
Amplification resistance, one end is divided to be arranged on the connection line connecting the first differential amplification resistance and the first operational amplifier and the other end
With analog power the 4th differential amplification resistance that is connected and the current-limiting resistance of the first operational amplifier series connection and one end arrange
On the connection line connecting current-limiting resistance and circuit output interface and the 3rd filtered electrical that is connected of the other end and analog power ground
Hold；
Described constant-current circuit includes that the electric current that its colelctor electrode is connected with external sensor input interface negative pole adjusts pipe, it is defeated
Go out the second operational amplifier and the homophase input of described second operational amplifier that end is connected with the base stage of described electric current adjustment pipe
The filtering dividing potential drop group that end connects；Described electric current adjusts the emitter stage of pipe and is connected with analog power ground, and its circuit is provided with electric current
Sample resistance, the inverting input of described second operational amplifier adjusts emitter stage and the current sampling of pipe with being connected described electric current
Connection between resistance.
In above technical scheme preferably, described filtering dividing potential drop group include the first divider resistance, the second divider resistance and
4th filter capacitor, the first end of described first divider resistance connects the second end of described second divider resistance, described 4th filter
Ripple electric capacity is in parallel with described second divider resistance, the second end connection system working power of described first divider resistance, and described
First end of two divider resistances connects analog power ground.
In above technical scheme preferably, the inverting input of described first operational amplifier connects with external sensor input
Mouth negative pole connects, and its in-phase input end is connected with external sensor input interface positive pole.
In order to reach superior technique effect, also include that breaking line preventive circuit, described breaking line preventive circuit include breaking line preventive resistance,
The two ends of described breaking line preventive resistance connect external sensor input interface positive pole and negative pole respectively.
In order to reach superior technique effect, also include that temperature-compensation circuit, described temperature-compensation circuit include that series connection sets
The diode put and thermo-compensator, the positive pole of described diode adjusts base stage and second computing of pipe with being connected described electric current
The outfan connection of amplifier, the negative pole of described diode is connected with the first end of described thermo-compensator, described temperature
Degree compensates the second end of resistance and adjusts the transmitting of pipe with the inverting input being connected described second operational amplifier and described electric current
The connection of pole.
In above technical scheme preferably, described first differential amplification resistance and described second differential amplification resistance
Resistance is equal；The resistance of described 3rd differential amplification resistance and described 4th differential amplification resistance is equal.
Application technical scheme, has the advantages that
1, the circuit for motor temperature Precision measurement of the present invention includes bleeder circuit, differential amplifier circuit and constant current
Circuit, mainly includes pull-up resistor in bleeder circuit, mainly include the first operational amplifier and three differences in differential amplifier circuit
Divide and amplify resistance, constant-current circuit mainly including, electric current adjusts pipe, the second operational amplifier, filtering dividing potential drop group, current sample electricity
Resistances etc., whole system is simplified, and can complete the collection to motor temperature；The amplification differential mode that is designed primarily for of differential amplifier circuit is believed
Number (beneficially gather) and the suppression to common-mode signal, improve circuit anti-interference performance.
2, by the introducing of breaking line preventive circuit, can ensure that constant-current circuit is set up, prevent because of ambient temperature sensor broken string or
The former unstable situations of circuital current that thus result in such as interface circuit is not connected with occur.
3, the introducing of temperature-compensation circuit, is mainly used in suppression circuit system each parts because of the change by ambient temperature
The temperature drift phenomenon occurred.
In addition to objects, features and advantages described above, the present invention also has other objects, features and advantages.
Below with reference to figure, the present invention is further detailed explanation.
Accompanying drawing explanation
The accompanying drawing of the part constituting the application is used for providing a further understanding of the present invention, and the present invention's is schematic real
Execute example and illustrate for explaining the present invention, being not intended that inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation of electric resistance partial pressure type circuit in prior art；
Fig. 2 is the structural representation of circuit in the embodiment of the present invention 1 for motor temperature Precision measurement；
Wherein, 1-1, operational amplifier, 1-2, the first resistance, 1-3, the second resistance, 1-4, pull-up resistor R, 1-5, first
Electric capacity, 1-6, the second electric capacity, 1-7, the 3rd electric capacity；
1, bleeder circuit, the 1.1, first filter capacitor, the 1.2, second filter capacitor, 1.3, pull-up resistor, 2, differential amplification
Circuit, the 2.1, first operational amplifier, the 2.2, first differential amplification resistance, the 2.3, second differential amplification resistance, the 2.4, the 3rd is poor
Point amplify resistance, the 2.5, the 4th differential amplification resistance, 2.6, current-limiting resistance, the 2.7, the 3rd filter capacitor, 3, constant-current circuit, 3.1,
Electric current adjust pipe, the 3.2, second operational amplifier, 3.3, filtering dividing potential drop group, the 3.31, first divider resistance, the 3.32, second dividing potential drop
Resistance, the 3.33, the 4th filter capacitor, 3.4, current sampling resistor, 3.5, decoupling capacitance, 4, breaking line preventive circuit, 4.1, breaking line preventive
Resistance, 5, temperature-compensation circuit, 5.1, diode, 5.2, thermo-compensator.
Detailed description of the invention
Below in conjunction with accompanying drawing, embodiments of the invention are described in detail, but the present invention can limit according to claim
Multitude of different ways that is fixed and that cover is implemented.
Embodiment 1:
Seeing Fig. 2, a kind of circuit for motor temperature Precision measurement, including external sensor input interface (Temp)
Bleeder circuit 1, one end are connected with described bleeder circuit 1 and the other end is connected with circuit output interface differential amplifier circuit 2 and
Constant-current circuit 3, breaking line preventive circuit 4 and the temperature-compensation circuit 5 that described bleeder circuit 1 connects.
Described bleeder circuit 1 includes being separately positioned on connection external sensor input interface positive pole (Temp+) and negative pole
(Temp-) the first filter capacitor 1.1 that is upper and that be all connected with analog power ground (AGND) and the second filter capacitor 1.2, one end are even
Connect external sensor input interface positive pole and the pull-up resistor 1.3 of other end connection system working power (VCC).
Described differential amplifier circuit 2 includes that one end connects described bleeder circuit 1 and the other end connects circuit output interface
(uC_ADC) the first operational amplifier 2.1, it is separately positioned on external sensor input interface positive pole and negative pole and all and institute
State the first differential amplification resistance 2.2 and the second differential amplification resistance 2.3 and described first that the first operational amplifier 2.1 connects
It is poor that the 3rd differential amplification resistance 2.4 (being also feedback resistance) that operational amplifier 2.1 is arranged in parallel, one end are arranged on connection first
Point amplify on the connection line of resistance 2.2 and the first operational amplifier 2.1 and the other end and analog power be connected the 4th poor
Amplification current-limiting resistance 2.6 and one end that resistance 2.5 is connected with the first operational amplifier 2.1 is divided to be arranged on and be connected current-limiting resistance
2.6 and circuit output interface connection line on and the 3rd filter capacitor 2.7 that is connected of the other end and analog power ground, herein:
The inverting input of described first operational amplifier 2.1 is connected with external sensor input interface negative pole, its in-phase input end with
External sensor input interface positive pole connects.In differential amplifier circuit 2: the 3rd differential amplification resistance 2.4 and the 4th differential amplification
The resistance of both resistance 2.5 is equal, and the resistance of both the first differential amplification resistance 2.2 and the second differential amplification resistance 2.3 is equal.
Described constant-current circuit 3 include the electric current that its colelctor electrode is connected with external sensor input interface negative pole adjust pipe 3.1,
Its outfan and described electric current adjust the second operational amplifier 3.2 and described second operational amplifier that the base stage of pipe 3.1 is connected
The filtering dividing potential drop group 3.3 that the in-phase input end of 3.2 connects；Described electric current adjusts the emitter stage of pipe 3.1 and is connected with analog power ground,
And its circuit is provided with current sampling resistor 3.4, the inverting input of described second operational amplifier 3.2 be connected described electric current
Adjust the connection between emitter stage and the current sampling resistor 3.4 of pipe 3.1.Described filtering dividing potential drop group 3.3 includes first point
Piezoresistance the 3.31, second divider resistance 3.32 and the 4th filter capacitor 3.33, the first end of described first divider resistance 3.31
Connecting the second end of described second divider resistance 3.32, described 4th filter capacitor 3.33 is with described second divider resistance 3.32 also
Connection, the second end connection system working power of described first divider resistance 3.31, the first end of described second divider resistance 3.32
Connect analog power ground.Second operational amplifier 3.2 is also associated with decoupling capacitance 3.5.
Described breaking line preventive circuit 4 includes breaking line preventive resistance 4.1, and the two ends of described breaking line preventive resistance 4.1 connect external respectively
Sensor input positive pole and negative pole.
Described temperature-compensation circuit 5 includes diode 5.1 and the thermo-compensator 5.2 being arranged in series, described diode
The positive pole of 5.1 adjusts the base stage of pipe 3.1 and the connection of the outfan of the second operational amplifier 3.2 with being connected described electric current,
The negative pole of described diode 5.1 is connected with the first end of described thermo-compensator 5.2, the of described thermo-compensator 5.2
Two ends adjust the circuit of the emitter stage of pipe 3.1 with the inverting input being connected described second operational amplifier 3.2 and described electric current
Connect.
Application the present embodiment is for the circuit of motor temperature Precision measurement, and details are:
Circuit design parameter computing formula is as follows:
By regulating the first divider resistance 3.31 and ratio of the second divider resistance 3.32, can draw in the middle of constant-current circuit
Current value, such as expression formula 1):
Vref=VCC/ (R3.31+R3.32) × R3.32 1)；
Wherein: Vref is the output voltage (reference voltage) in constant-current circuit, and VCC is system working power, R3.31 and
R3.32 refers to the first divider resistance 3.31 and resistance value of the second divider resistance 3.32 respectively.
Constant Electric Current flow valuve computing formula such as expression formula 2):
I=Vref/R5.2 2)；
Wherein: I is the current value in constant-current circuit, Vref is the output voltage in constant-current circuit, and R5.2 is temperature-compensating
The resistance value of resistance 5.2.
Differential amplifier circuit computing formula such as expression formula 3):
VO=(Vi+-Vi-) RF/R 3)；
Wherein: VO is the output voltage of operational amplifier, Vi+ is the homophase input voltage of the first operational amplifier, and Vi-is
The reverse inter-input-ing voltage of the first operational amplifier, RF represents the 3rd differential amplification resistance 2.4, and R represents the second differential amplification resistance
2.3。
The circuit operation principle of the present embodiment is described as follows:
By regulation reference voltage (Vref), current constant value in initialization circuit, the calculating of steady state value such as expression formula 2) institute
Showing, when ambient temperature changes, the resistance of sensor also can change, and now adjusting pipe can be according to the current electricity set
Stream, goes to adjust size of current in circuit, and making electric current will not be changed by resistance of sensor is affected, and is gathered by differential amplifier circuit
The terminal voltage of temperature sensor such as expression formula 3) shown in, thus obtain ambient temperature, now temperature and resistance is the electricity collected
Pressure, divided by the current value in constant current, then can draw ambient temperature by tabling look-up.
When variation of ambient temperature in circuit control panel, electric current adjusts pipe, operational amplifier and resistance and has minimum temperature
Drift phenomenon, in order to suppress the generation of this phenomenon, introduces temperature-compensation circuit.By the dynamic electric resistor of diode, adjust current
Electric current adjusts the conduction voltage drop of pipe (audion)；When the temperature increases, the dynamic electric resistor of diode raises, thus the conducting obtained
Voltage increases, and electric current adjusts the conducting of pipe and increases, it is ensured that current current constant value.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, that is made any repaiies
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (6)
1. the circuit for motor temperature Precision measurement, it is characterised in that include the dividing potential drop of external sensor input interface
The differential amplifier circuit (2) that circuit (1), one end are connected with described bleeder circuit (1) and the other end is connected with circuit output interface
And the constant-current circuit (3) being connected with described bleeder circuit (1)；
Described bleeder circuit (1) include being separately positioned on connection external sensor input interface positive pole and negative pole and all with simulate
First filter capacitor (1.1) of power supply ground connection and the second filter capacitor (1.2) and one end connect external sensor input and connect
Mouth positive pole and the pull-up resistor (1.3) of other end connection system working power；
Described differential amplifier circuit (2) includes that one end connects described bleeder circuit (1) and the other end connects circuit output interface
First operational amplifier (2.1), be separately positioned on external sensor input interface positive pole and negative pole and all with described first fortune
The first differential amplification resistance (2.2) and the second differential amplification resistance (2.3) and described first that calculation amplifier (2.1) connects are transported
The 3rd differential amplification resistance (2.4), one end that calculation amplifier (2.1) is arranged in parallel are arranged on connection the first differential amplification resistance
(2.2) the 4th differential amplification that on the connection line of and the first operational amplifier (2.1) and the other end and analog power ground is connected
Current-limiting resistance (2.6) and one end that resistance (2.5) is connected with the first operational amplifier (2.1) are arranged on and are connected current-limiting resistance
(2.6) and on the connection line of circuit output interface and the 3rd filter capacitor (2.7) that is connected with analog power ground of the other end；
Described constant-current circuit (3) include the electric current that its colelctor electrode is connected with external sensor input interface negative pole adjust pipe (3.1),
The second operational amplifier (3.2) that its outfan is connected with the base stage of described electric current adjustment pipe (3.1) is put with described second computing
Filtering dividing potential drop group (3.3) that the in-phase input end of big device (3.2) connects；Described electric current adjusts emitter stage and the simulation of pipe (3.1)
Power supply ground connects, and its circuit is provided with current sampling resistor (3.4), the anti-phase input of described second operational amplifier (3.2)
Connection between emitter stage and the current sampling resistor (3.4) held and be connected described electric current adjustment pipe (3.1).
Circuit for motor temperature Precision measurement the most according to claim 1, it is characterised in that described filtering dividing potential drop group
(3.3) the first divider resistance (3.31), the second divider resistance (3.32) and the 4th filter capacitor (3.33) are included, described first
First end of divider resistance (3.31) connects the second end of described second divider resistance (3.32), described 4th filter capacitor
(3.33) in parallel with described second divider resistance (3.32), the second end connection system work of described first divider resistance (3.31)
Power supply, the first end of described second divider resistance (3.32) connects analog power ground.
Circuit for motor temperature Precision measurement the most according to claim 1, it is characterised in that described first computing is put
The inverting input of big device (2.1) is connected with external sensor input interface negative pole, and its in-phase input end is defeated with external sensor
Incoming interface positive pole connects.
4. according to the circuit for motor temperature Precision measurement described in claim 1-3 any one, it is characterised in that also wrap
Including breaking line preventive circuit (4), described breaking line preventive circuit (4) includes breaking line preventive resistance (4.1), the two of described breaking line preventive resistance (4.1)
End connects external sensor input interface positive pole and negative pole respectively.
Circuit for motor temperature Precision measurement the most according to claim 4, it is characterised in that also include temperature-compensating
Circuit (5), described temperature-compensation circuit (5) includes diode (5.1) and the thermo-compensator (5.2) being arranged in series, described
The positive pole of diode (5.1) adjusts base stage and the outfan of the second operational amplifier (3.2) of pipe (3.1) with being connected described electric current
Connection, the negative pole of described diode (5.1) is connected with the first end of described thermo-compensator (5.2), described temperature
The second end compensating resistance (5.2) adjusts with the inverting input being connected described second operational amplifier (3.2) and described electric current
The connection of the emitter stage of pipe (3.1).
Circuit for motor temperature Precision measurement the most according to claim 5, it is characterised in that described first difference is put
Big resistance (2.2) and described second differential amplification resistance (2.3) both resistances are equal；Described 3rd differential amplification resistance
And described 4th differential amplification resistance (2.5) both resistances are equal (2.4).
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| CN201610622703.7A CN106289560A (en) | 2016-08-01 | 2016-08-01 | A kind of circuit for motor temperature Precision measurement |
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| CN201610622703.7A CN106289560A (en) | 2016-08-01 | 2016-08-01 | A kind of circuit for motor temperature Precision measurement |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106885640A (en) * | 2017-03-30 | 2017-06-23 | 苏州汇川联合动力系统有限公司 | A kind of motor temperature sample circuit |
| CN111397756A (en) * | 2020-04-03 | 2020-07-10 | 江苏吉泰科电气股份有限公司 | Motor temperature detection circuit suitable for multiple sensor types |
| CN111509961A (en) * | 2020-05-18 | 2020-08-07 | 广东美的暖通设备有限公司 | Over-temperature protection device, variable frequency driver, electrical appliance, method, device and storage medium |
| CN113091929A (en) * | 2019-12-23 | 2021-07-09 | 比亚迪股份有限公司 | Motor temperature sampling circuit and fault detection method thereof |
| CN113659804A (en) * | 2021-08-13 | 2021-11-16 | 上海空间电源研究所 | System for restraining high-low temperature constant current point drift amount for aerospace |
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| CN114235207A (en) * | 2021-12-20 | 2022-03-25 | 珠海格力电器股份有限公司 | Temperature sampling circuit, method, device, equipment, storage medium and electric automobile |
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| CN113091929A (en) * | 2019-12-23 | 2021-07-09 | 比亚迪股份有限公司 | Motor temperature sampling circuit and fault detection method thereof |
| CN113091929B (en) * | 2019-12-23 | 2023-04-07 | 比亚迪股份有限公司 | Motor temperature sampling circuit and fault detection method thereof |
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| CN113659804A (en) * | 2021-08-13 | 2021-11-16 | 上海空间电源研究所 | System for restraining high-low temperature constant current point drift amount for aerospace |
| CN114235207A (en) * | 2021-12-20 | 2022-03-25 | 珠海格力电器股份有限公司 | Temperature sampling circuit, method, device, equipment, storage medium and electric automobile |
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