CN213779319U - Motor temperature sampling circuit and system - Google Patents
Motor temperature sampling circuit and system Download PDFInfo
- Publication number
- CN213779319U CN213779319U CN202021969263.0U CN202021969263U CN213779319U CN 213779319 U CN213779319 U CN 213779319U CN 202021969263 U CN202021969263 U CN 202021969263U CN 213779319 U CN213779319 U CN 213779319U
- Authority
- CN
- China
- Prior art keywords
- resistor
- voltage
- electrically connected
- operational amplifier
- capacitor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The application relates to a motor temperature sampling circuit and a system, wherein the motor temperature sampling circuit comprises a temperature sensor; the filtering module is electrically connected with the temperature sensor and is used for filtering the analog signal of the temperature sensor and inhibiting signal interference; the resistance voltage division module is electrically connected with the filtering module and is used for dividing the analog signals after filtering to obtain voltage signals; the operational amplification module is electrically connected with the resistance voltage division module and is used for carrying out differential operational amplification on the voltage signal and outputting the voltage signal to the microprocessor; and parameters of each element of the filtering module, the resistance voltage division module and the operational amplification module are adjusted according to the type of the temperature sensor. The application can realize the adaptation of different temperature sensors and the high-precision acquisition of the real-time motor temperature, and avoids the resource waste caused by the incompatibility of repeated design and sensors.
Description
Technical Field
The application relates to the technical field of temperature monitoring, in particular to a motor temperature sampling circuit and system.
Background
At present, with the development of technology, electric vehicles are becoming increasingly popular. One of the most important parts of an electric vehicle is a motor, and most of the motors in the market use a permanent magnet synchronous motor. The rotor of the permanent magnet synchronous motor is a permanent magnet, but demagnetization can occur at high temperature, so that the performance of the motor is reduced, and the normal running of an automobile is influenced. Therefore, it is necessary to sample and detect the temperature of the motor and to present the temperature when the temperature is too high. The current motor Temperature sensors are divided into two categories, namely NTC (Negative Temperature Coefficient) and PTC (Positive Temperature Coefficient), and the Temperature coefficients of different sensors are greatly different. Different temperature sampling circuits are required to be designed to acquire high-precision real-time temperatures aiming at different sensors, the circuits are generally incompatible, so that the PCB design needs to be repeatedly designed, the circuits cannot be used universally aiming at different sensors, and great inconvenience and waste are brought.
Disclosure of Invention
The embodiment of the application provides a motor temperature sampling circuit and a controller to solve the problem that different temperature sampling circuits are required to be designed to acquire high-precision real-time temperatures aiming at different sensors in the related art, and the temperature sampling circuit cannot be used universally aiming at different sensors.
In a first aspect, a motor temperature sampling circuit is provided, including:
a temperature sensor;
the filtering module is electrically connected with the temperature sensor and is used for filtering the analog signal of the temperature sensor and inhibiting signal interference;
the resistance voltage division module is electrically connected with the filtering module and is used for dividing the analog signals after filtering to obtain voltage signals; and the number of the first and second groups,
the operational amplification module is electrically connected with the resistance voltage division module and is used for carrying out differential operational amplification on the voltage signal and outputting the voltage signal to the microprocessor;
and parameters of each element of the filtering module, the resistance voltage division module and the operational amplification module are adjusted according to the type of the temperature sensor.
In some embodiments, the temperature sensor is configured as an NTC thermistor or a PTC thermistor.
In some embodiments, the filter module includes a magnetic bead filter circuit electrically connected to the temperature sensor, and a filter circuit electrically connected to the magnetic bead filter circuit, the filter circuit being electrically connected to the resistance voltage divider module.
In some embodiments, the magnetic bead filter circuit includes a first magnetic bead and a second magnetic bead, one end of the temperature sensor is electrically connected to one end of the first magnetic bead, the other end of the temperature sensor is electrically connected to one end of the second magnetic bead, and both the first magnetic bead and the second magnetic bead are electrically connected to the filter circuit.
In some embodiments, the filter circuit comprises a common mode inductor, a first filter capacitor, a second filter capacitor, and a third filter capacitor;
the input side of the common-mode inductor is electrically connected with the other end of the first magnetic bead and the other end of the second magnetic bead respectively, and the output side of the common-mode inductor is electrically connected with the resistance voltage division module;
two ends of the first filter capacitor are respectively and electrically connected with the output side of the common-mode inductor;
one end of the second filter capacitor and one end of the third filter capacitor are grounded, and the other end of the second filter capacitor and the other end of the third filter capacitor are respectively and electrically connected with the output side of the common-mode inductor.
In some embodiments, the resistor voltage-dividing module comprises a first voltage-dividing resistor, a second voltage-dividing resistor, a third voltage-dividing resistor, a fourth voltage-dividing resistor, a fifth voltage-dividing resistor and a fourth capacitor;
one end of the fourth voltage-dividing resistor is grounded through the second voltage-dividing resistor, and one end of the fourth voltage-dividing resistor is electrically connected with one end of the first filter capacitor; the other end of the fourth voltage-dividing resistor is grounded through the fifth voltage-dividing resistor and is electrically connected with one end of the third voltage-dividing resistor;
the fifth voltage-dividing resistor is connected with the fourth capacitor in parallel;
the other end of the third voltage-dividing resistor is electrically connected with a power supply through the first voltage-dividing resistor, the other end of the third voltage-dividing resistor is electrically connected with the other end of the first filter capacitor, and the other end of the third voltage-dividing resistor is electrically connected with the operational amplification module.
In some embodiments, the operational amplification module includes a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an operational amplifier, a fifth capacitor, a sixth capacitor, and a seventh capacitor;
one end of the sixth resistor is connected with a power supply, the other end of the sixth resistor is grounded through the seventh resistor, and the other end of the sixth resistor is electrically connected with the inverting terminal of the operational amplifier through the eighth resistor;
the ninth resistor is connected with the fifth capacitor in parallel, one end of the ninth resistor is electrically connected with the inverting end of the operational amplifier, and the other end of the ninth resistor is electrically connected with the output end of the operational amplifier;
one end of the tenth resistor is electrically connected with the output end of the operational amplifier, the other end of the tenth resistor is grounded through the seventh capacitor, and the other end of the tenth resistor is electrically connected with the microprocessor;
the positive power supply end of the operational amplifier is connected with the power supply, the positive power supply end of the operational amplifier is grounded through the sixth capacitor, the negative power supply end of the operational amplifier is grounded, and the in-phase end of the operational amplifier is grounded through the fourth capacitor.
In some embodiments, adjusting parameters of each element of the filtering module, the resistance voltage dividing module, and the operational amplification module according to the type of the temperature sensor specifically includes: the temperature sensor is an NTC thermistor, the third voltage dividing resistor, the fifth voltage dividing resistor, the sixth resistor, the seventh resistor, the eighth resistor and the fifth capacitor are all arranged as a blank paste, and the ninth resistor is a zero ohm resistor;
the input voltage of the non-inverting terminal of the operational amplifier is V+，
Wherein R is1Is the resistance value, R, of the first divider resistor2Is that it isResistance value of the second voltage-dividing resistor, RtNIs the resistance value, V, of the NTC thermistorccIs the voltage value of the power supply;
determining the input voltage of the inverting terminal of the operational amplifier to be V according to the virtual short principle of the operational amplifier-，V-＝V+；
The output voltage of the operational amplifier is Vout，Vout＝V-＝V+。
In some embodiments, adjusting parameters of each element of the filtering module, the resistance voltage dividing module, and the operational amplification module according to the type of the temperature sensor specifically includes: the temperature sensor is a PTC thermistor, and the fourth voltage dividing resistor is a blank paste;
the input voltage of the non-inverting terminal of the operational amplifier is V+，
Wherein R is1Is the resistance value, R, of the first divider resistor2Is the resistance value, R, of the second voltage-dividing resistor3Is a resistance value, R, of the third voltage dividing resistor5Is a resistance value, R, of the fifth voltage-dividing resistortPIs the resistance value, V, of the PTC thermistorccIs the voltage value of the power supply;
determining the input voltage of the inverting terminal of the operational amplifier to be V according to the virtual short principle of the operational amplifier-，V-＝V+；
The voltage of the eighth resistor is V8，
The current of the eighth resistor is I,
wherein R is6Is the resistance value of the sixth resistor, R7Is the resistance value of the seventh resistor, R8Is the resistance value of the eighth resistor;
the output voltage of the operational amplifier is Vout，Vout＝V+-I*R9，R9Is the resistance value of the ninth resistor.
In a second aspect, a motor temperature sampling system is provided, which includes the above motor temperature sampling circuit and a controller.
The beneficial effect that technical scheme that this application provided brought includes: the method can realize the adaptation of different temperature sensors and the high-precision acquisition of the real-time motor temperature, and avoids the resource waste caused by the incompatibility of repeated design and sensors.
The embodiment of the application provides a motor temperature sampling circuit and a controller, and the parameters of each element are adjusted according to the type of a temperature sensor, so that the adaptation and high-precision acquisition of real-time motor temperature of different temperature sensors can be realized, and the resource waste caused by the incompatibility of repeated design and sensors is avoided.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a block diagram of a structure of a motor temperature sampling circuit provided in an embodiment of the present application;
fig. 2 is a schematic circuit diagram of a motor temperature sampling circuit according to an embodiment of the present disclosure;
fig. 3 is a block diagram of a structure of a motor temperature sampling system according to an embodiment of the present application.
Reference numerals:
100. a temperature sensor; 200. a filtering module; 300. a resistance voltage division module; 400. an operational amplification module; 500. a microprocessor.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The embodiment of the application provides a motor temperature sampling circuit, and the motor temperature sampling circuit can be used for solving the problem that different temperature sampling circuits are required to be designed to acquire high-precision real-time temperature, and cannot be used universally for different sensors.
As shown in fig. 1, a motor temperature sampling circuit includes a temperature sensor 100, a filtering module 200, a resistance voltage dividing module 300, and an operational amplifying module 400, where the filtering module 200 is electrically connected to the temperature sensor 100, and is configured to filter an analog signal of the temperature sensor 100 to suppress signal interference. The resistance voltage dividing module 300 is electrically connected to the filtering module 200, and is configured to divide the filtered analog signal to obtain a voltage signal. The operational amplifier module 400 is electrically connected to the resistor divider module 300, and is configured to perform differential operational amplification on the voltage signal, and then output the voltage signal to the microprocessor.
The temperature-sensitive resistor of the temperature sensor 100 is connected to the resistor voltage dividing module 300 through the filtering module 200, and outputs a voltage signal to the operational amplifier module 400 after voltage division, and outputs the voltage signal to the microprocessor after operational amplifier processing, and finally the microprocessor gives the actual temperature.
And parameters of each element of the filtering module, the resistance voltage division module and the operational amplification module are adjusted according to the type of the temperature sensor. The temperature sensor is a thermistor and comprises an NTC thermistor or a PTC thermistor, and the NTC thermistor or the PTC thermistor generate different signal changes based on different temperature coefficients.
The application can realize the adaptation of different temperature sensors and the high-precision acquisition of the real-time motor temperature, and avoids the resource waste caused by the incompatibility of repeated design and sensors.
Optionally, in another embodiment of the present application, the filter module includes a magnetic bead filter circuit and a filter circuit, the magnetic bead filter circuit is electrically connected to the temperature sensor, and the filter circuit is electrically connected to the magnetic bead filter circuit and the resistance voltage dividing module.
Optionally, as shown in fig. 2, in another embodiment of the present application, the bead filter circuit includes a first bead FB1 and a second bead FB2, the thermistor Rt has one end electrically connected to one end of the first bead FB1 and the other end electrically connected to one end of the second bead FB2, and both the first bead FB1 and the second bead FB2 are electrically connected to the filter circuit. Because the thermistor Rt is located in the motor and has a certain spatial distance from the controller, it is easy to be interfered by external signals in the propagation path to cause a large sampling error, so the first magnetic bead FB1 and the second magnetic bead FB2 are used to perform preliminary filtering on the analog signal on the thermistor connected in parallel in the sampling circuit, and the temperature differential signal processed by the two magnetic beads is sent to the filter circuit of the wave filter.
Optionally, as shown in fig. 2, in another embodiment of the present application, the filter circuit includes a common-mode inductor T1, a first filter capacitor C1, a second filter capacitor C2, and a third filter capacitor C3. The input side of the common-mode inductor T1 is electrically connected to the other end of the first magnetic bead FB1 and the other end of the second magnetic bead FB2, respectively, and the output side of the common-mode inductor T1 is electrically connected to the resistance voltage dividing module. Two ends of the first filter capacitor C1 are electrically connected to the output side of the common mode inductor T1, respectively. One end of the second filter capacitor C2 and one end of the third filter capacitor C3 are grounded, and the other end of the second filter capacitor C2 and the other end of the third filter capacitor C3 are electrically connected to the output side of the common mode inductor T1, respectively.
The temperature differential signals processed by the first magnetic bead FB1 and the second magnetic bead FB2 are transmitted to two ends of the input side of the common mode inductor T1, the leakage inductance of the common mode inductor T1 forms two differential mode inductors, and the two differential mode inductors and the first filter capacitor C1 form an LC filter together to inhibit differential mode interference in the signals. The common-mode inductor T1, the second filter capacitor C2 and the third filter capacitor C3 form another LC filter to suppress common-mode interference in signals.
Optionally, as shown in fig. 2, in another embodiment of the present application, the resistance voltage dividing module includes a first voltage dividing resistor R1, a second voltage dividing resistor R2, a third voltage dividing resistor R3, a fourth voltage dividing resistor R4, a fifth voltage dividing resistor R5, and a fourth capacitor C4. One end of the fourth voltage-dividing resistor R4 is grounded through the second voltage-dividing resistor R2, and one end of the fourth voltage-dividing resistor R4 is electrically connected with one end of the first filter capacitor C1; the other end of the fourth voltage-dividing resistor R4 is grounded through the fifth voltage-dividing resistor R5, and is electrically connected to one end of the third voltage-dividing resistor R3. The fifth voltage-dividing resistor R5 is connected in parallel with the fourth capacitor C4, the other end of the third voltage-dividing resistor R3 is electrically connected with the power supply through the first voltage-dividing resistor R1, the other end of the third voltage-dividing resistor R3 is electrically connected with the other end of the first filter capacitor C1, and the other end of the third voltage-dividing resistor R3 is electrically connected with the operational amplification module.
The temperature-sensitive resistor is a passive device, cannot generate an analog signal autonomously, and is connected in series between the first divider resistor R1 and the second divider resistor R2 after passing through the filtering module. And adjusting parameters according to the type of the temperature-sensitive resistor, and inputting the divided analog signal to the in-phase end of the operational amplifier U1.
Optionally, as shown in fig. 2, in another embodiment of the present application, the operational amplification module includes a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an operational amplifier U1, a fifth capacitor C5, a sixth capacitor C6, and a seventh capacitor C7. One end of the sixth resistor R6 is connected to the power supply, the other end of the sixth resistor R6 is grounded through the seventh resistor R7, and the other end of the sixth resistor R6 is electrically connected to the inverting terminal of the operational amplifier U1 through the eighth resistor R8. The ninth resistor R9 is connected in parallel with the fifth capacitor C5, one end of the ninth resistor R9 is electrically connected with the inverting terminal of the operational amplifier U1, the other end of the ninth resistor R9 is electrically connected with the output terminal of the operational amplifier U1, one end of the tenth resistor R10 is electrically connected with the output terminal of the operational amplifier U1, the other end of the tenth resistor R10 is grounded through the seventh capacitor C7, the other end of the tenth resistor R10 is electrically connected with the microprocessor, the positive power supply terminal of the operational amplifier U1 is connected with the power supply, the positive power supply terminal of the operational amplifier U1 is grounded through the sixth capacitor C6, the negative power supply terminal of the operational amplifier U1 is grounded, and the inverting terminal of the operational amplifier U1 is grounded through the fourth capacitor C4.
And inputting the analog signal subjected to voltage division by the resistance voltage division module to the in-phase end of the operational amplifier U1. The power supply voltage Vcc is divided by a sixth resistor R6, a seventh resistor R7 and an eighth resistor R8 and then input to the inverting terminal of the operational amplifier U1, the ninth resistor R9 and the fifth capacitor C5 jointly form a feedback resistor, and the sixth capacitor C6 is a decoupling capacitor of the operational amplifier. The tenth resistor R10 and the seventh capacitor C7 form a first-order RC filter, which filters the voltage signal output by the operational amplifier U1 and sends the filtered voltage signal to the microprocessor.
Alternatively, in another embodiment of the present application, when the thermistor Rt is an NTC thermistor, the third voltage dividing resistor R3, the fifth voltage dividing resistor R5, the sixth resistor R9, the seventh resistor R7, the eighth resistor R8, and the fifth capacitor C5 are all null patches, and the ninth resistor R9 is a zero ohm resistor. The empty paste indicates that the corresponding position of the resistor is an empty paste position, and a resistor element and a zero ohm resistor are not arranged when the circuit board is produced. The first voltage dividing resistor R1 and the second voltage dividing resistor R2 perform resistance voltage division, the fourth voltage dividing resistor R4 and the fourth capacitor C4 form a first-order RC filter, and the operational amplifier is represented as a voltage follower. The input voltage of the non-inverting terminal of the operational amplifier U1 is
Wherein R is1Is the resistance value of a first divider resistor R12Is the resistance value of a second voltage-dividing resistor R2tNIs the resistance value of NTC thermistor, VccIs the voltage value of the power supply. Determining the input voltage of the inverting terminal of the operational amplifier U1 to be V according to the virtual short principle of the operational amplifier-，V-＝V+The operational amplifier differentially amplifies the inputs of the in-phase end and the anti-phase end and outputs the amplified inputs, and the output voltage of the operational amplifier U1 is Vout，Vout＝V-＝V+。
Alternatively, in another embodiment of the present application, the thermistor Rt is a PTC thermistor, and the fourth voltage dividing resistor R4 is a dummy strip. The input voltage of the non-inverting terminal of the operational amplifier U1 is V+，
Wherein R is1Is the resistance value of a first divider resistor R12Is the resistance value of a second voltage-dividing resistor R23Is the resistance value of the third voltage dividing resistor R35Is the resistance value of a fifth voltage-dividing resistor R5tPIs the resistance value of the PTC thermistor, VccIs the voltage value of the power supply. Determining the input voltage of the inverting terminal of the operational amplifier U1 to be V according to the virtual short principle of the operational amplifier-，V-＝V+The voltage of the eighth resistor R8 is V8，
The current of the eighth resistor R8 is I,
wherein R is6Is the resistance value of the sixth resistor R67Is the resistance value of a seventh resistor R78The operational amplifier is used for differentially amplifying the inputs of the in-phase end and the out-phase end and outputting the amplified inputs as the resistance value of the eighth resistor R8, and the output voltage of the operational amplifier U1 is Vout，Vout＝V+-I*R9，R9Is the resistance value of the ninth resistor R9.
Because the thermistor Rt is located in the motor and has a certain spatial distance from the controller, and a large sampling error is easily caused by external signal interference in a propagation path, the first magnetic bead FB1 and the second magnetic bead FB2 are used for preliminarily filtering an analog signal on the thermistor connected in parallel in the sampling circuit, a temperature differential signal processed by the two magnetic beads is sent to two ends of the input side of the common-mode inductor T1, the leakage inductance of the common-mode inductor T1 forms two differential-mode inductors, and the two differential-mode inductors and the first filter capacitor C1 form an LC filter together to suppress the differential-mode interference in the signal. The common-mode inductor T1, the second filter capacitor C2 and the third filter capacitor C3 form another LC filter to suppress common-mode interference in signals.
The temperature-sensitive resistor is a passive device, cannot generate an analog signal autonomously, and is connected in series between the first divider resistor R1 and the second divider resistor R2 after passing through the filtering module. And adjusting parameters according to the type of the temperature-sensitive resistor, and inputting the divided analog signal to the in-phase end of the operational amplifier U1. The power supply voltage Vcc is divided by a sixth resistor R6, a seventh resistor R7 and an eighth resistor R8 and then input to the inverting terminal of the operational amplifier U1, the ninth resistor R9 and the fifth capacitor C5 jointly form a feedback resistor, and the sixth capacitor C6 is a decoupling capacitor of the operational amplifier. The tenth resistor R10 and the seventh capacitor C7 form a first-order RC filter, which filters the voltage signal output by the operational amplifier U1 and sends the filtered voltage signal to the microprocessor.
As shown in fig. 3, a motor temperature sampling system includes a motor temperature sampling circuit and a controller 500 according to the above embodiment, the motor temperature sampling circuit includes a temperature sensor 100, a filtering module 200, a resistance voltage dividing module 300, and an operational amplifying module 400, and the connection manner and implementation manner of each module are already described in detail in the above embodiment and are not described in detail again.
In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. The term "comprising", without further limitation, means that the element so defined is not excluded from the group consisting of additional identical elements in the process, method, article, or apparatus that comprises the element.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A motor temperature sampling circuit, comprising:
a temperature sensor;
the filtering module is electrically connected with the temperature sensor and is used for filtering the analog signal of the temperature sensor and inhibiting signal interference;
the resistance voltage division module is electrically connected with the filtering module and is used for dividing the analog signals after filtering to obtain voltage signals; and the number of the first and second groups,
the operational amplification module is electrically connected with the resistance voltage division module and is used for carrying out differential operational amplification on the voltage signal and outputting the voltage signal to the microprocessor;
and parameters of each element of the filtering module, the resistance voltage division module and the operational amplification module are adjusted according to the type of the temperature sensor.
2. The motor temperature sampling circuit of claim 1, wherein the temperature sensor is configured as an NTC thermistor or a PTC thermistor.
3. The motor temperature sampling circuit of claim 1, wherein the filter module comprises a bead filter circuit electrically connected to the temperature sensor, and a filter circuit electrically connected to the bead filter circuit, the filter circuit being electrically connected to the resistor divider module.
4. The motor temperature sampling circuit of claim 3, wherein the magnetic bead filter circuit comprises a first magnetic bead and a second magnetic bead, wherein one end of the temperature sensor is electrically connected to one end of the first magnetic bead, the other end of the temperature sensor is electrically connected to one end of the second magnetic bead, and both the first magnetic bead and the second magnetic bead are electrically connected to the filter circuit.
5. The motor temperature sampling circuit of claim 4, wherein the filter circuit comprises a common mode inductor, a first filter capacitor, a second filter capacitor, and a third filter capacitor;
the input side of the common-mode inductor is electrically connected with the other end of the first magnetic bead and the other end of the second magnetic bead respectively, and the output side of the common-mode inductor is electrically connected with the resistance voltage division module;
two ends of the first filter capacitor are respectively and electrically connected with the output side of the common-mode inductor;
one end of the second filter capacitor and one end of the third filter capacitor are grounded, and the other end of the second filter capacitor and the other end of the third filter capacitor are respectively and electrically connected with the output side of the common-mode inductor.
6. The motor temperature sampling circuit according to claim 5, wherein the resistance voltage dividing module comprises a first voltage dividing resistor, a second voltage dividing resistor, a third voltage dividing resistor, a fourth voltage dividing resistor, a fifth voltage dividing resistor and a fourth capacitor;
one end of the fourth voltage-dividing resistor is grounded through the second voltage-dividing resistor, and one end of the fourth voltage-dividing resistor is electrically connected with one end of the first filter capacitor; the other end of the fourth voltage-dividing resistor is grounded through the fifth voltage-dividing resistor and is electrically connected with one end of the third voltage-dividing resistor;
the fifth voltage-dividing resistor is connected with the fourth capacitor in parallel;
the other end of the third voltage-dividing resistor is electrically connected with a power supply through the first voltage-dividing resistor, the other end of the third voltage-dividing resistor is electrically connected with the other end of the first filter capacitor, and the other end of the third voltage-dividing resistor is electrically connected with the operational amplification module.
7. The motor temperature sampling circuit according to claim 6, wherein the operational amplification module comprises a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an operational amplifier, a fifth capacitor, a sixth capacitor and a seventh capacitor;
one end of the sixth resistor is connected with a power supply, the other end of the sixth resistor is grounded through the seventh resistor, and the other end of the sixth resistor is electrically connected with the inverting terminal of the operational amplifier through the eighth resistor;
the ninth resistor is connected with the fifth capacitor in parallel, one end of the ninth resistor is electrically connected with the inverting end of the operational amplifier, and the other end of the ninth resistor is electrically connected with the output end of the operational amplifier;
one end of the tenth resistor is electrically connected with the output end of the operational amplifier, the other end of the tenth resistor is grounded through the seventh capacitor, and the other end of the tenth resistor is electrically connected with the microprocessor;
the positive power supply end of the operational amplifier is connected with the power supply, the positive power supply end of the operational amplifier is grounded through the sixth capacitor, the negative power supply end of the operational amplifier is grounded, and the in-phase end of the operational amplifier is grounded through the fourth capacitor.
8. The motor temperature sampling circuit according to claim 7, wherein adjusting parameters of each element of the filter module, the resistance voltage division module, and the operational amplification module according to the type of the temperature sensor specifically comprises: the temperature sensor is an NTC thermistor, the third voltage dividing resistor, the fifth voltage dividing resistor, the sixth resistor, the seventh resistor, the eighth resistor and the fifth capacitor are all arranged as a blank paste, and the ninth resistor is a zero ohm resistor;
the input voltage of the non-inverting terminal of the operational amplifier is V+，
Wherein R is1Is the resistance value, R, of the first divider resistor2Is the resistance value, R, of the second voltage-dividing resistortNIs the resistance value, V, of the NTC thermistorccIs the voltage value of the power supply;
determining the input voltage of the inverting terminal of the operational amplifier to be V according to the virtual short principle of the operational amplifier-，V-＝V+；
The output voltage of the operational amplifier is Vout，Vout＝V-＝V+。
9. The motor temperature sampling circuit according to claim 7, wherein adjusting parameters of each element of the filter module, the resistance voltage division module, and the operational amplification module according to the type of the temperature sensor specifically comprises: the temperature sensor is a PTC thermistor, and the fourth voltage dividing resistor is a blank paste;
the input voltage of the non-inverting terminal of the operational amplifier is V+，
Wherein R is1Is the resistance value, R, of the first divider resistor2Is the resistance value, R, of the second voltage-dividing resistor3Is the third oneResistance value of voltage-dividing resistor, R5Is a resistance value, R, of the fifth voltage-dividing resistortPIs the resistance value, V, of the PTC thermistorccIs the voltage value of the power supply;
determining the input voltage of the inverting terminal of the operational amplifier to be V according to the virtual short principle of the operational amplifier-，V-＝V+；
The voltage of the eighth resistor is V8，
The current of the eighth resistor is I,
wherein R is6Is the resistance value of the sixth resistor, R7Is the resistance value of the seventh resistor, R8Is the resistance value of the eighth resistor;
the output voltage of the operational amplifier is Vout，Vout＝V+-I*R9，R9Is the resistance value of the ninth resistor.
10. A motor temperature sampling system comprising the motor temperature sampling circuit of any one of claims 1 to 9 and a controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021969263.0U CN213779319U (en) | 2020-09-10 | 2020-09-10 | Motor temperature sampling circuit and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021969263.0U CN213779319U (en) | 2020-09-10 | 2020-09-10 | Motor temperature sampling circuit and system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213779319U true CN213779319U (en) | 2021-07-23 |
Family
ID=76904336
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021969263.0U Active CN213779319U (en) | 2020-09-10 | 2020-09-10 | Motor temperature sampling circuit and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213779319U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113741276A (en) * | 2021-09-02 | 2021-12-03 | 华能澜沧江水电股份有限公司 | Method for improving analog input reliability in hydroelectric generating set control and storage medium |
| CN114030388A (en) * | 2021-10-27 | 2022-02-11 | 智新控制系统有限公司 | Overcurrent protection system and method |
-
2020
- 2020-09-10 CN CN202021969263.0U patent/CN213779319U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113741276A (en) * | 2021-09-02 | 2021-12-03 | 华能澜沧江水电股份有限公司 | Method for improving analog input reliability in hydroelectric generating set control and storage medium |
| CN113741276B (en) * | 2021-09-02 | 2023-01-10 | 华能澜沧江水电股份有限公司 | Method for improving analog input reliability in hydroelectric generating set control and storage medium |
| CN114030388A (en) * | 2021-10-27 | 2022-02-11 | 智新控制系统有限公司 | Overcurrent protection system and method |
| CN114030388B (en) * | 2021-10-27 | 2024-02-27 | 智新控制系统有限公司 | Overcurrent protection system and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN213779319U (en) | Motor temperature sampling circuit and system | |
| CN207881859U (en) | A kind of motor in electric automobile temperature sensing circuit | |
| CN109884384B (en) | Signal acquisition circuit compatible with current and voltage input | |
| WO2018118737A1 (en) | Current sensing circuit and current sensing assembly including the same | |
| CN104236009A (en) | Conditioner signal acquisition compensating device and method | |
| JP2010223781A (en) | Current integrating circuit device and secondary battery package using the same | |
| WO2023098521A1 (en) | New energy vehicle, vehicle-mounted charging device, temperature measurement circuit, and temperature measurement method | |
| CN105403759A (en) | Leakage current detection circuit for ADC sampling | |
| CN110828149A (en) | Open-close type current transformer and error compensation method thereof | |
| CN110207840B (en) | Detection circuit | |
| CN112050964A (en) | Temperature detection circuit, temperature monitoring method and electric automobile | |
| CN210442425U (en) | Novel current sampling conditioning circuit | |
| CN107589296B (en) | Signal acquisition device, detector, battery device and delivery vehicle of high-voltage loop | |
| CN109975590A (en) | Current measurement circuit based on Hall chip and shunt resistance | |
| CN209803233U (en) | Signal acquisition circuit compatible with current and voltage input | |
| CN217059098U (en) | Temperature sampling circuit and electronic equipment | |
| CN219870036U (en) | Anti-interference temperature sampling circuit | |
| CN108732415B (en) | AC sensor and circuit breaker | |
| CN218499125U (en) | Direct current signal isolation acquisition circuit | |
| CN212060305U (en) | Wheel speed detection circuit for vehicle | |
| WO2024090239A1 (en) | Differential input/differential output inverting amplifier circuit and measuring device | |
| CN211317592U (en) | Zero-setting-free micro-sensor signal processing circuit | |
| CN209197924U (en) | A kind of motor temperature sampling general module circuit | |
| CN216792309U (en) | Isolation circuit and current detection circuit applying same | |
| CN110763904B (en) | Motor end voltage acquisition circuit and application thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |