CN210625896U - Sampling circuit for motor stator temperature in motor controller - Google Patents
Sampling circuit for motor stator temperature in motor controller Download PDFInfo
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- CN210625896U CN210625896U CN201921822456.0U CN201921822456U CN210625896U CN 210625896 U CN210625896 U CN 210625896U CN 201921822456 U CN201921822456 U CN 201921822456U CN 210625896 U CN210625896 U CN 210625896U
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Abstract
The utility model discloses a sampling circuit for the temperature of a motor stator in a motor controller, which is an ESD anti-static unit with electrostatic protection diodes as circuit input; the inductive filter, the first capacitor and the second capacitor form an input filtering unit; the first resistor, the second resistor, the fourth resistor and the fifth resistor form an input voltage division unit; the third resistor forms an input signal to power supply short-circuit protection unit; a signal conditioning unit is formed by a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a third capacitor, a fourth capacitor, a fifth capacitor and an operational amplifier; and the tenth resistor and the sixth capacitor form a signal output filtering unit. The sampling circuit overcomes the defect of temperature sampling of the traditional motor stator, solves the problem that the sampling circuit is burnt out by the temperature signal line of the motor stator to the power supply short circuit, has strong anti-interference capability, high reliability and high sampling precision, and enhances the safety performance of the electric automobile.
Description
Technical Field
The utility model relates to a sampling circuit that is arranged in motor controller motor stator temperature.
Background
With the rapid development of new energy automobile technology, the power density of the motor is more and more required by the whole automobile factory due to the restriction of vehicle space and the restriction of use environment. Along with the working current of the motor is continuously increased, the motor controller needs to sample the temperature of the stator of the motor in real time, and when the sampled temperature exceeds a set protection threshold, the motor controller closes the motor drive to prevent the motor from being damaged due to overheating. The electric automobile has quite high requirements on functional safety, so that the anti-interference capability, the reliability and the sampling precision of the motor stator temperature sampling circuit are quite important. The input signal of the traditional motor stator temperature sampling circuit has no protection function on power short circuit, the sampling circuit can be burnt when short circuit fault occurs, and the circuit has no EMC filtering function, has poor anti-interference capability and low sampling precision, easily causes large temperature sampling error of a motor controller, and misreports over-temperature fault, thereby influencing normal driving safety.
Disclosure of Invention
The utility model aims to solve the technical problem that a sampling circuit for motor stator temperature among the machine controller is provided, the defect of traditional motor stator temperature sampling is overcome to this sampling circuit, has solved motor stator temperature signal line and has burnt out the problem of sampling circuit to the power short circuit, and the circuit interference killing feature is strong, the reliability is high, the sampling precision is high, has strengthened electric automobile's security performance.
In order to solve the above technical problem, the sampling circuit for motor stator temperature in a motor controller of the present invention comprises an electrostatic protection diode, an inductive filter, an operational amplifier, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, and a tenth resistor; the input end and the output end of the electrostatic protection diode are respectively connected with the two input ends of the inductive filter, the grounding end of the electrostatic protection diode is connected with the earth ground end, one end of the first capacitor and one end of the second capacitor are respectively connected with the two output ends of the inductive filter, the other end of the first capacitor and the second capacitor are connected with the earth ground end, the head end of the first resistor is connected with the positive end of a power supply and the tail end of the third resistor is connected with the circuit ground end after the first resistor, the second capacitor and the third resistor are sequentially connected in series, the two output ends of the inductive filter are respectively connected with the two ends of the second resistor, the two ends of the fourth resistor and the fifth resistor are respectively connected with the positive end of the power supply and the circuit ground end after the fourth resistor and the fifth resistor are connected in series, the positive input end of the operational amplifier is connected between the first resistor and the second, after the tenth resistor and the sixth capacitor are connected in series, one end of the tenth resistor is connected with the output end of the operational amplifier, one end of the sixth capacitor is connected with the circuit ground, and the connecting end of the tenth resistor and the sixth capacitor is the output end of the sampling circuit.
Further, the inductive filter is a common mode filter.
Further, the operational amplifier is an LM2904 operational amplifier.
Because the utility model discloses a sampling circuit for motor stator temperature in motor controller adopts above-mentioned technical scheme, namely this sampling circuit constitutes the ESD anti-static unit of circuit input by the electrostatic protection diode; the inductive filter, the first capacitor and the second capacitor form an input filtering unit; the first resistor, the second resistor, the fourth resistor and the fifth resistor form an input voltage division unit; the third resistor forms an input signal to power supply short-circuit protection unit; a signal conditioning unit is formed by a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a third capacitor, a fourth capacitor, a fifth capacitor and an operational amplifier; and the tenth resistor and the sixth capacitor form a signal output filtering unit. The sampling circuit overcomes the defect of temperature sampling of the traditional motor stator, solves the problem that the sampling circuit is burnt out by the temperature signal line of the motor stator to the power supply short circuit, has strong anti-interference capability, high reliability and high sampling precision, and enhances the safety performance of the electric automobile.
Drawings
The invention will be described in further detail with reference to the following drawings and embodiments:
fig. 1 is a schematic structural diagram of a sampling circuit for motor stator temperature in a motor controller.
Detailed Description
Embodiment as shown in fig. 1, the sampling circuit for motor stator temperature in a motor controller of the present invention includes an electrostatic protection diode D, an inductive filter L, an operational amplifier U, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, and a tenth resistor R10; the input end and the output end of the electrostatic protection diode D are respectively connected with the two input ends of the inductive filter L, the grounding end of the electrostatic protection diode D is connected with an EARTH ground end EARTH, one ends of the first capacitor C1 and the second capacitor C2 are respectively connected with the two output ends and the other end of the inductive filter L, the first resistor R1, the second resistor R2 and the third resistor R3 are sequentially connected in series, the head end of the first resistor R1 is connected with the positive end of a power supply, the tail end of the third resistor R3 is connected with a circuit ground end GND, the two output ends of the inductive filter L are respectively connected with the two ends of the second resistor R2, the two ends of the fourth resistor R4 and the fifth resistor R5 are connected in series, the two ends of the fourth resistor R6 are respectively connected with the positive end and the circuit ground end GND, and the positive input end of the operational amplifier U is connected between the first resistor R1 and the second resistor R2 through the sixth, A negative electrode input end is connected between the fourth resistor R4 and the fifth resistor R5 through the seventh resistor R7, after the third capacitor C3 and the eighth resistor R8 are connected in parallel, one end is connected to a positive electrode input end of the operational amplifier U, the other end is connected to a circuit ground GND, after the fifth capacitor C5 and the ninth resistor R9 are connected in parallel, one end is connected to a negative electrode input end of the operational amplifier U, the other end is connected to an output end of the operational amplifier U, the fourth capacitor C4 is connected between a power supply end of the operational amplifier U and the circuit ground GND, after the tenth resistor R10 and the sixth capacitor C6 are connected in series, one end of the tenth resistor R10 is connected to an output end of the operational amplifier U, one end of the sixth capacitor C6 is connected to the circuit ground GND, and a connection end of the tenth resistor R10 and the sixth capacitor C6 is an output end AD _ temp of the sampling circuit.
Preferably, the inductive filter L is a common mode filter. The common mode filter adopts a ferrite core, and double wires are wound in parallel. The low differential mode noise signal suppresses the interference source, and has good noise suppression, high common mode noise suppression and low differential mode noise signal suppression.
Preferably, the operational amplifier U is an LM2904 operational amplifier. The operational amplifier is specially applied to automobiles and industrial control systems, and a circuit of the operational amplifier is composed of two independent operational amplifiers with high gain and internal frequency compensation.
The circuit is composed of an input ESD (electro-static discharge) antistatic unit, an input filtering unit, an input voltage division unit, an input signal to power supply short-circuit protection unit, a voltage conditioning unit and an output filtering unit. The input ESD anti-static unit comprises an electrostatic protection diode D; the input filtering unit comprises an inductive filter L, a capacitor C1 and a capacitor C2; the input voltage division unit comprises a first resistor R1, a second resistor R2, a fourth resistor R4 and a fifth resistor R5; the input signal-to-power short-circuit protection unit comprises a third resistor R3; the voltage conditioning unit comprises a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5 and an operational amplifier U; the output filtering unit includes a tenth resistor R10 and a sixth capacitor C6.
Firstly, a sampling input signal of the temperature of the motor stator passes through an ESD electrostatic protection diode D to filter electrostatic interference; then an LC type filter consisting of an inductive filter L, a first capacitor C1 and a second capacitor C2 is used for filtering out external high-frequency interference signals; the sampling input signal is connected in series with a third resistor R3, and the current-limiting protection effect is realized when the power supply is short-circuited; because the nominal input voltage range of the operational amplifier LM2904 is 0-3V, the sampling signal needs to be divided by the first resistor R1, the second resistor R2, the fourth resistor R4 and the fifth resistor R5, and the input voltage is controlled within the nominal input voltage range of the operational amplifier LM 2904; because the input voltage signal is a differential signal, the input voltage signal needs to be converted into a single-ended voltage signal through the voltage conditioning unit and sent to an AD port of the MCU in the motor controller, wherein the sixth resistor R6, the seventh resistor R7, the eighth resistor R8, the ninth resistor R9, the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5, and the operational amplifier U form an amplifying circuit, and the fourth capacitor C4 filters a power supply of the operational amplifier U; and the tenth resistor R10 and the sixth capacitor C6 form an RC filter for filtering interference signals in the sampling signals. During actual use, only the resistance values of the sixth resistor R6, the seventh resistor R7, the eighth resistor R8 and the ninth resistor R9 need to be adjusted, a required output voltage value can be obtained, the output voltage value is sent to a motor stator temperature sampling pin of an AD port in the MCU, the MCU accurately reads the voltage value output by the circuit in real time and converts the voltage value into a temperature value, when the temperature value exceeds a set protection threshold value, the MCU automatically turns off a motor driving signal, the motor stops working, and the motor is prevented from being damaged due to overheating.
The circuit has the advantages that the input signal protection function for the power supply short circuit is added, and the sampling circuit cannot be burnt when the short circuit fault occurs; the electrostatic protection diode D has ESD protection of +/-30 kV and meets the AEC-Q101 automobile standard; the input filtering function adopts an LC circuit, the output filtering function adopts an RC circuit, noise interference in sampling signals is eliminated, and the MCU cannot misreport over-temperature faults of the motor; therefore, the circuit has the advantages of strong anti-interference capability, high sampling precision and high reliability, and improves the safety level of the electric automobile.
Claims (3)
1. A sampling circuit for motor stator temperature in a motor controller is characterized in that: the sampling circuit comprises an electrostatic protection diode, an inductive filter, an operational amplifier, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor and a tenth resistor; the input end and the output end of the electrostatic protection diode are respectively connected with the two input ends of the inductive filter, the grounding end of the electrostatic protection diode is connected with the earth ground end, one end of the first capacitor and one end of the second capacitor are respectively connected with the two output ends of the inductive filter, the other end of the first capacitor and the second capacitor are connected with the earth ground end, the head end of the first resistor is connected with the positive end of a power supply and the tail end of the third resistor is connected with the circuit ground end after the first resistor, the second capacitor and the third resistor are sequentially connected in series, the two output ends of the inductive filter are respectively connected with the two ends of the second resistor, the two ends of the fourth resistor and the fifth resistor are respectively connected with the positive end of the power supply and the circuit ground end after the fourth resistor and the fifth resistor are connected in series, the positive input end of the operational amplifier is connected between the first resistor and the second, after the tenth resistor and the sixth capacitor are connected in series, one end of the tenth resistor is connected with the output end of the operational amplifier, one end of the sixth capacitor is connected with the circuit ground, and the connecting end of the tenth resistor and the sixth capacitor is the output end of the sampling circuit.
2. The sampling circuit for motor stator temperature in a motor controller of claim 1, wherein: the inductive filter is a common mode filter.
3. A sampling circuit for motor stator temperature in a motor controller according to claim 1 or 2, characterized in that: the operational amplifier is an LM2904 operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921822456.0U CN210625896U (en) | 2019-10-28 | 2019-10-28 | Sampling circuit for motor stator temperature in motor controller |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921822456.0U CN210625896U (en) | 2019-10-28 | 2019-10-28 | Sampling circuit for motor stator temperature in motor controller |
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| CN210625896U true CN210625896U (en) | 2020-05-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921822456.0U Active CN210625896U (en) | 2019-10-28 | 2019-10-28 | Sampling circuit for motor stator temperature in motor controller |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112272440A (en) * | 2020-10-10 | 2021-01-26 | 上海纯米电子科技有限公司 | Display screen anti-static interference circuit and display device |
| CN113984244A (en) * | 2021-10-22 | 2022-01-28 | 臻驱科技（上海）有限公司 | Protection circuit of motor temperature sampling interface, motor temperature sampling module and electric vehicle |
-
2019
- 2019-10-28 CN CN201921822456.0U patent/CN210625896U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112272440A (en) * | 2020-10-10 | 2021-01-26 | 上海纯米电子科技有限公司 | Display screen anti-static interference circuit and display device |
| CN113984244A (en) * | 2021-10-22 | 2022-01-28 | 臻驱科技（上海）有限公司 | Protection circuit of motor temperature sampling interface, motor temperature sampling module and electric vehicle |
| CN113984244B (en) * | 2021-10-22 | 2023-10-20 | 臻驱科技（上海）有限公司 | Protection circuit of motor temperature sampling interface, motor temperature sampling module and electric vehicle |
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