New energy controller motor temperature sampling circuit

Abstract

The utility model discloses a new energy controller motor temperature sampling circuit, which is characterized by comprising a power supply filter circuit, a temperature signal sampling circuit, a drive control module and a signal conditioning and amplifying module, the power supply filter circuit is connected with the driving control module, the temperature sampling circuit is connected with the driving control module, and the driving control module is connected with the signal conditioning and amplifying module. The motor temperature sampling accuracy is improved, the motor temperature sampling is not easily influenced by the temperature, the motor temperature sampling reliability is effectively improved, and the motor is protected more timely.

Description

Technical Field

[0001] This utility model belongs to the field of sampling circuit technology and relates to a motor temperature sampling circuit for a new energy controller. Background Technology

[0002] To prevent the internal windings and magnets of a motor from overheating and causing damage, motor manufacturers often install motor temperature sensors in the gaps between the windings. These sensors monitor the internal motor temperature in real time and provide temperature sampling signals to the motor temperature detection circuit in the motor controller, enabling the controller to determine and implement over-temperature protection. However, because different manufacturers and even different models of motors use different enameled wires and magnet materials, the temperature rise characteristics and allowable operating temperature ranges vary. Therefore, to more accurately monitor motor temperature, the temperature sensors installed in different manufacturers and even different models of motors from the same manufacturer may differ. Common types include PT100, PT1000, NTC, and KTY130 temperature sensors. Previously, common techniques included using resistor voltage dividers and DIP switches to select different resistance values ​​to adapt to different temperature sensors; and software-controlled switching of transistors and optocouplers to select different resistance values ​​to adapt to different types of temperature sensors. Summary of the Invention

[0003] To address the problems existing in the background technology, this utility model proposes a new energy controller motor temperature sampling circuit.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a new energy controller motor temperature sampling circuit, characterized in that it includes: a power supply filtering circuit, a temperature signal sampling circuit, a drive control module, and a signal conditioning and amplification module;

[0005] The power supply filtering circuit is connected to the drive control module, the temperature sampling circuit is connected to the drive control module, and the drive control module is connected to the signal conditioning and amplification module.

[0006] The temperature signal sampling circuit includes: temperature sensor selection port, resistor R1, resistor R2, resistor R13, resistor R14, capacitor C3, transistor Q4, Temp port, and Temp- port;

[0007] The temperature sensor selection port is connected to one end of resistor R1, the other end of resistor R1 is connected to resistor R2 and the base of transistor Q4, and the other end of resistor R2 is connected to the emitter of transistor Q4 and ground.

[0008] The temperature sensor selection port is connected to one end of resistor R13, the other end of resistor R13 is connected to resistor R14 and one end of capacitor C3, and the other end of resistor R14 is connected to the other end of capacitor C3 and ground.

[0009] The Temp port is connected to one end of inductor L1, and the Temp- port is connected to one end of inductor L2.

[0010] The drive control module includes: a first drive control module and a second drive control module;

[0011] The first drive control module is connected to the second drive control module, the temperature signal sampling circuit is connected to both the first and second drive control modules, and the signal conditioning and amplification module is connected to both the first and second drive control modules.

[0012] The second drive control module includes MOSFET Q3, resistor R11, and resistor R12;

[0013] The gate of MOSFET Q3 is connected to one end of capacitor C3, the source of MOSFET Q3 is connected to the other end of capacitor C3, the other end of resistor R12, and ground, and the drain of MOSFET Q3 is connected to the other end of resistor R11.

[0014] The first drive control module includes MOSFET Q1, MOSFET Q2, resistors R3, R4, R5, R6, R7, R8, R9, and R10.

[0015] The collector of transistor Q4 is connected to one end of resistor R3, one end of resistor R4, and one end of resistor R5. The other end of resistor R3 is connected to the input power supply +5V, the source of MOSFET Q1, one end of resistor R7, the source of MOSFET Q2, and one end of resistor R9. The other end of resistor R4 is connected to the gate of MOSFET Q1. The other end of resistor R5 is connected to the gate of MOSFET Q2. The other end of resistor R6 is connected to the other end of inductor L1, the other end of resistor R7, one end of resistor R10, one end of resistor R11, one end of resistor R12, one end of resistor R8, and one end of resistor R9. The other end of resistor R10 is connected to the other end of inductor L2.

[0016] The signal conditioning and amplification module includes: resistors R15, R16, R17, R18, R19, amplifier U1, capacitors C4, C5, and C6.

[0017] One end of resistor R15 is connected to one end of resistor R16, the other end of resistor R9, and the other end of resistor R12. The other end of resistor R15 is connected to one end of resistor R17, one end of capacitor C5, and the inverting input terminal of amplifier U1. The other end of resistor R17 is connected to the other end of capacitor C5, the output terminal of amplifier U1, and one end of resistor R19. The other end of resistor R16 is connected to one end of capacitor C4, one end of resistor R18, and the non-inverting input terminal of amplifier U1. The other end of capacitor C4 and the other end of resistor R18 are connected to ground. The other end of resistor R19 is connected to one end of capacitor C6, and the other end of capacitor C6 is connected to ground. The output signal of amplifier U1... .

[0018] The power supply filter circuit includes capacitors C1 and C2;

[0019] One end of capacitor C1 is connected to one end of capacitor C2, the input power supply +5V, and the source of MOSFET Q1. The other end of capacitor C1 is connected to the other end of capacitor C2 and ground.

[0020] Furthermore,

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] Using a low-resistance MOSFET as a switch in the motor temperature sampling circuit significantly improves measurement accuracy and system stability. The extremely low on-resistance of the MOSFET minimizes signal transmission loss, allowing the weak voltage signal output from the temperature sensor to be transmitted to the acquisition module with almost no attenuation, avoiding measurement deviations caused by voltage drops in traditional transistors. Simultaneously, the MOSFET is insensitive to temperature changes; its threshold voltage is minimally affected by temperature, maintaining stable switching performance over a wide temperature range of -40℃ to 150℃, thus solving the misjudgment problem caused by temperature drift in transistors. This circuit not only improves the accuracy of motor temperature sampling but also reduces its susceptibility to temperature influences, effectively enhancing the reliability of motor temperature sampling and providing more timely motor protection. Attached Figure Description

[0023] Figure 1 This is a block diagram of a motor temperature sampling circuit for a new energy controller according to this utility model;

[0024] Figure 2 This is a connection diagram of a motor temperature sampling circuit for a new energy controller according to this utility model;

[0025] Figure 3 This is the equivalent circuit diagram of the low-level temperature sensing signal input of this utility model;

[0026] Figure 4 This is the equivalent circuit diagram of the high-level temperature sensing signal input of this utility model. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] like Figures 1-4 As shown, the technical solution adopted by this utility model is as follows: a new energy controller motor temperature sampling circuit, characterized in that it includes: a power supply filtering circuit, a temperature signal sampling circuit, a drive control module, and a signal conditioning and amplification module.

[0029] The power supply filtering circuit is connected to the drive control module, the temperature sampling circuit is connected to the drive control module, and the drive control module is connected to the signal conditioning and amplification module.

[0030] The temperature signal sampling circuit includes: temperature sensor selection port, resistors R1, R2, R13, and R14, capacitor C3, transistor Q4, Temp port, and Temp- port.

[0031] The temperature sensor selection port is connected to one end of resistor R1, the other end of resistor R1 is connected to resistor R2 and the base of transistor Q4, and the other end of resistor R2 is connected to the emitter of transistor Q4 and ground.

[0032] The temperature sensor selection port is connected to one end of resistor R13, the other end of resistor R13 is connected to resistor R14 and one end of capacitor C3, and the other end of resistor R14 is connected to the other end of capacitor C3 and ground.

[0033] The Temp port is connected to one end of inductor L1, and the Temp- port is connected to one end of inductor L2.

[0034] The drive control module includes: a first drive control module and a second drive control module.

[0035] The first drive control module is connected to the second drive control module, the temperature signal sampling circuit is connected to both the first and second drive control modules, and the signal conditioning and amplification module is connected to both the first and second drive control modules.

[0036] The second drive control module includes MOSFET Q3, resistor R11, and resistor R12.

[0037] The gate of MOSFET Q3 is connected to one end of capacitor C3, the source of MOSFET Q3 is connected to the other end of capacitor C3, the other end of resistor R12, and ground, and the drain of MOSFET Q3 is connected to the other end of resistor R11.

[0038] The first drive control module includes MOSFET Q1, MOSFET Q2, resistors R3, R4, R5, R6, R7, R8, R9, and R10.

[0039] The collector of transistor Q4 is connected to one end of resistor R3, one end of resistor R4, and one end of resistor R5. The other end of resistor R3 is connected to the input power supply +5V, the source of MOSFET Q1, one end of resistor R7, the source of MOSFET Q2, and one end of resistor R9. The other end of resistor R4 is connected to the gate of MOSFET Q1. The other end of resistor R5 is connected to the gate of MOSFET Q2. The other end of resistor R6 is connected to the other end of inductor L1, the other end of resistor R7, one end of resistor R10, one end of resistor R11, one end of resistor R12, one end of resistor R8, and one end of resistor R9. The other end of resistor R10 is connected to the other end of inductor L2.

[0040] The signal conditioning and amplification module includes: resistors R15, R16, R17, R18, R19, amplifier U1, capacitors C4, C5, and C6.

[0041] One end of resistor R15 is connected to one end of resistor R16, the other end of resistor R9, and the other end of resistor R12. The other end of resistor R15 is connected to one end of resistor R17, one end of capacitor C5, and the inverting input terminal of amplifier U1. The other end of resistor R17 is connected to the other end of capacitor C5, the output terminal of amplifier U1, and one end of resistor R19. The other end of resistor R16 is connected to one end of capacitor C4, one end of resistor R18, and the non-inverting input terminal of amplifier U1. The other end of capacitor C4 and the other end of resistor R18 are connected to ground. The other end of resistor R19 is connected to one end of capacitor C6, and the other end of capacitor C6 is connected to ground. The output signal of amplifier U1... .

[0042] The power supply filtering circuit includes capacitors C1 and C2.

[0043] One end of capacitor C1 is connected to one end of capacitor C2, the input power supply +5V, and the source of MOSFET Q1. The other end of capacitor C1 is connected to the other end of capacitor C2 and ground.

[0044] Resistors R1, R2, R3, and R14 work in conjunction with the temperature sensor to perform voltage division, determine the voltage value corresponding to the temperature, and realize the conversion of temperature signal to voltage signal.

[0045] The resistance of the temperature sensor changes with temperature, converting the temperature signal into a voltage signal for subsequent circuitry to acquire.

[0046] Resistors R3, R4, R5, R6, R7, R8, R9, R10, R11, and R12 provide bias voltages for MOSFETs Q1, Q2, and Q3, controlling their conduction and cutoff to ensure normal switching function.

[0047] Resistors R15 and R16 are involved in the transmission of the input signal of amplifier U1.

[0048] Resistors R17 and R18 form the operational amplifier feedback network, which sets the signal amplification factor.

[0049] Resistor R19 provides current limiting protection to prevent excessive output current.

[0050] Capacitors C1, C2, C3, and C6 filter out high-frequency noise in the +5V power supply, ensuring stable power supply.

[0051] Capacitors C4 and C5 suppress noise at the input or output of amplifier U1, ensuring signal stability.

[0052] Inductors L1 and L2 suppress high-frequency interference in temperature signal transmission and, together with capacitors, form a filter network to ensure signal purity.

[0053] A new energy controller motor temperature sampling circuit, wherein the internal temperature sensor of the motor is equivalent to a voltage divider resistor R. t The temperature sampling signal is connected to this temperature sampling circuit via the Temp port and Temp-port network. After being filtered by inductors L1 and L2, it is transmitted to the subsequent voltage divider circuit, where it works together with the other voltage divider resistors with constant resistance inside the circuit to divide the voltage. Taking the simultaneous support of PT1000 and NTC temperature sensors as an example, the temperature sensing signal is connected to the DSP pin, and the DSP controls the output high and low levels to select between NTC and PT1000.

[0054] When the temperature sensor is PT1000, a low-level temperature sensing signal input, after passing through resistor R1, controls transistor Q4 to turn off. The +5V power supply, after passing through resistors R3, R4, and R5, controls MOSFETs Q1 and Q2. Because MOSFETs Q1 and Q2 are P-channel MOSFETs, their gate and source voltages are equal, so MOSFETs Q1 and Q2 are turned off at this time. When the temperature sensing signal input is low, MOSFET Q3 is turned off. The circuit at this time is as follows: Figure 3 As shown.

[0055] The simplified circuit consists of inductors L1 and L2, resistors R7, R10, R9, R12, R15, R16, R17, R18, R19, capacitors C1, C2, C5, C6, and amplifier U1.

[0056] Capacitors C1, C2, and C4 filter the +5V input power supply to ensure power stability and accurate voltage division. Capacitor C5 provides loop compensation for the operational amplifier. Resistors R9 and R12 divide the +5V input power supply to provide a signal input to the inverting input of amplifier U1, thus determining the voltage value at the inverting input of amplifier U1. Similarly, the remaining voltage divider resistors in the voltage divider circuit are also used to divide the +5V reference power supply input, thus serving as the signal input to the non-inverting input of amplifier U1. However, unlike the resistors that divide the voltage at the inverting input, the equivalent voltage across the motor temperature circuit is... The voltage is divided by inductors L1 and L2, and resistors R7 and R10, connected through the Temp+ and Temp- ports. The voltage at the non-inverting input of the operational amplifier circuit can then be calculated. The signal amplified by amplifier U1 is transmitted to the DSP through an RC filter consisting of capacitor R19 and capacitor C6; the output value of amplifier U1 is given by the formula... This refers to the final motor temperature processing signal that this motor temperature detection solution will output to the DSP. Based on this, the operational amplifier circuit will output the signal. The DSP can then perform subsequent corresponding operations such as displaying the motor temperature value or executing the motor over-temperature protection operation.

[0057] When the temperature sensor is NTC, the temperature sensing signal input is high-level. After passing through resistor R1, it controls MOSFET Q4 to turn on. At this time, the gates of MOSFETs Q1 and Q2 are pulled low to 0V through MOSFET Q4. Due to the voltage between the gate and source of MOSFETs Q1 and Q2... Therefore, MOSFETs Q1 and Q2 are turned on; after MOSFETs Q1 and Q2 are turned on, resistors R6 and R7 are connected in parallel, and resistors R8 and R9 are connected in parallel; and when the temperature sensing signal input is high, MOSFET Q3 is turned on, and resistors R11 and R12 are connected in parallel; the circuit at this time is as follows. Figure 4 As shown.

[0058] The simplified circuit consists of inductors L1 and L2, resistors R6, R7, R8, R10, R9, R11, R12, R15, R16, R17, R18, R19, resistors C1, C2, C5, and C6, and amplifier U1. The voltage value at the inverting input terminal of amplifier U1 is... The voltage value at the non-inverting input of amplifier U1 Similarly, the above formula leads to... Then the DSP can... The value will be used to perform subsequent corresponding motor temperature value display operations or motor over-temperature protection operations.

[0059] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A motor temperature sampling circuit for a new energy controller, characterized in that, It includes: power supply filtering circuit, temperature signal sampling circuit, drive control module, and signal conditioning and amplification module; The power supply filtering circuit is connected to the drive control module, the temperature sampling circuit is connected to the drive control module, and the drive control module is connected to the signal conditioning and amplification module.

2. The new energy controller motor temperature sampling circuit according to claim 1, characterized in that, The temperature signal sampling circuit includes: temperature sensor selection port, resistor R1, resistor R2, resistor R13, resistor R14, capacitor C3, transistor Q4, Temp port, and Temp- port; The temperature sensor selection port is connected to one end of resistor R1, the other end of resistor R1 is connected to resistor R2 and the base of transistor Q4, and the other end of resistor R2 is connected to the emitter of transistor Q4 and ground. The temperature sensor selection port is connected to one end of resistor R13, the other end of resistor R13 is connected to resistor R14 and one end of capacitor C3, and the other end of resistor R14 is connected to the other end of capacitor C3 and ground. The Temp port is connected to one end of inductor L1, and the Temp- port is connected to one end of inductor L2.

3. The new energy controller motor temperature sampling circuit according to claim 2, characterized in that, The drive control module includes: a first drive control module and a second drive control module; The first drive control module is connected to the second drive control module, the temperature signal sampling circuit is connected to both the first and second drive control modules, and the signal conditioning and amplification module is connected to both the first and second drive control modules.

4. The new energy controller motor temperature sampling circuit according to claim 3, characterized in that, The second drive control module includes MOSFET Q3, resistor R11, and resistor R12; The gate of MOSFET Q3 is connected to one end of capacitor C3, the source of MOSFET Q3 is connected to the other end of capacitor C3, the other end of resistor R12, and ground, and the drain of MOSFET Q3 is connected to the other end of resistor R11.

5. The new energy controller motor temperature sampling circuit according to claim 4, characterized in that, The first drive control module includes MOSFET Q1, MOSFET Q2, resistors R3, R4, R5, R6, R7, R8, R9, and R10. The collector of transistor Q4 is connected to one end of resistor R3, one end of resistor R4, and one end of resistor R5. The other end of resistor R3 is connected to the input power supply +5V, the source of MOSFET Q1, one end of resistor R7, the source of MOSFET Q2, and one end of resistor R9. The other end of resistor R4 is connected to the gate of MOSFET Q1. The other end of resistor R5 is connected to the gate of MOSFET Q2. The other end of resistor R6 is connected to the other end of inductor L1, the other end of resistor R7, one end of resistor R10, one end of resistor R11, one end of resistor R12, one end of resistor R8, and one end of resistor R9. The other end of resistor R10 is connected to the other end of inductor L2.

6. The new energy controller motor temperature sampling circuit according to claim 5, characterized in that, The signal conditioning and amplification module includes: resistors R15, R16, R17, R18, R19, amplifier U1, capacitors C4, C5, and C6. One end of resistor R15 is connected to one end of resistor R16, the other end of resistor R9, and the other end of resistor R12. The other end of resistor R15 is connected to one end of resistor R17, one end of capacitor C5, and the inverting input terminal of amplifier U1. The other end of resistor R17 is connected to the other end of capacitor C5, the output terminal of amplifier U1, and one end of resistor R19. The other end of resistor R16 is connected to one end of capacitor C4, one end of resistor R18, and the non-inverting input terminal of amplifier U1. The other end of capacitor C4 and the other end of resistor R18 are connected to ground. The other end of resistor R19 is connected to one end of capacitor C6, and the other end of capacitor C6 is connected to ground. The output signal of amplifier U1... .

7. The new energy controller motor temperature sampling circuit according to claim 5, characterized in that, The power supply filter circuit includes capacitors C1 and C2; One end of capacitor C1 is connected to one end of capacitor C2, the input power supply +5V, and the source of MOSFET Q1. The other end of capacitor C1 is connected to the other end of capacitor C2 and ground.

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