Temperature sampling circuit for all-in-one controller of new energy commercial vehicle

By designing a temperature sampling circuit, the problem of the temperature difference between the NTC thermistor and the internal temperature of the motor controller was solved, enabling accurate fault diagnosis and control strategy optimization of the motor controller, improving the reliability and safety of the motor controller, and reducing production costs.

CN224175973UActive Publication Date: 2026-04-28SHENZHEN SILICON MOUNTAIN TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
SHENZHEN SILICON MOUNTAIN TECH CO LTD
Filing Date
2025-04-30
Publication Date
2026-04-28

AI Technical Summary

Technical Problem

In the all-in-one controller for new energy commercial vehicles, the temperature detected by the NTC thermistor differs from the internal temperature of the motor controller, which leads to complex fault diagnosis, potential safety hazards, and difficulty in optimizing control strategies.

Method used

Design a temperature sampling circuit, including a power supply filtering module, an input filtering module, a voltage divider conditioning module, a limiting protection module, and an operational amplifier module. High-frequency interference is filtered out through capacitive coupling output design, and a clamping diode protection circuit is added to ensure signal purity and circuit reliability.

Benefits of technology

This improves the accuracy and reliability of internal temperature detection in motor controllers, avoids overheating damage, extends service life, ensures vehicle driving safety, and reduces production costs.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a temperature sampling circuit for an all-in-one controller of a new energy commercial vehicle. The temperature sampling circuit comprises a power supply filtering module, an input filtering module, a partial pressure conditioning module, an amplitude limiting protection module and an operational amplification module, the input filtering module is connected with the partial pressure conditioning module, the partial pressure conditioning module is connected with the operational amplification module, the amplitude limiting protection module is connected with the operational amplification module, and the operational amplification module is connected with the power supply filtering module. Through capacitive coupling output, high-frequency interference signals are reduced. And a clamping diode is added to prevent voltage overshoot and protect the circuit from being damaged. Circuit complexity is low, devices are few, and cost is low.
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Description

Technical Field

[0001] This utility model belongs to the field of sampling circuit technology, and relates to a temperature sampling circuit for a multi-function controller for new energy commercial vehicles. Background Technology

[0002] High-power motor drive modules are typically used in multi-function controllers for new energy commercial vehicles. These modules usually integrate NTC thermistors to detect their temperature and prevent overheating damage. However, if the drive module is in a well-cooled environment, the temperature detected by the integrated NTC thermistor may not be the same as the internal temperature of the motor controller. In other words, there is a difference between the temperature detected by the thermistor and the internal temperature of the multi-function controller. Abnormal overheating within the motor controller can affect the lifespan of its electronic components and the drive module, and in severe cases, may affect the normal operation of the electric vehicle, posing a safety hazard. Currently, motor controllers typically collect motor and drive module temperatures for motor control and fault diagnosis, making control optimization difficult and fault diagnosis strategies complex. Summary of the Invention

[0003] To address the problems existing in the background technology, this utility model proposes a temperature sampling circuit for an all-in-one controller for new energy commercial vehicles. This utility model performs real-time monitoring of the internal ambient temperature of the motor controller, which is used for fault diagnosis and control strategy optimization, preventing abnormal overheating within the motor controller, extending its service life, and ensuring vehicle driving safety.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a temperature sampling circuit for a multi-function controller for new energy commercial vehicles, comprising: a power supply filtering module, an input filtering module, a voltage divider conditioning module, a limiting protection module, and an operational amplifier module;

[0005] The input filtering module is connected to the voltage divider conditioning module, the voltage divider conditioning module is connected to the amplitude limiting protection module, the amplitude limiting protection module is connected to the operational amplifier module, and the operational amplifier module is connected to the power supply filtering module.

[0006] The input filtering module includes: resistor R1 and capacitor C1;

[0007] One end of resistor R1 is connected to the input power supply +5V, and the other end of resistor R1 is connected to one end of capacitor C1. The other end of capacitor C1 is connected to ground.

[0008] The voltage divider conditioning module includes: resistor R2 and resistor R3;

[0009] Resistors R2 and R3 are connected in parallel across capacitor C1.

[0010] The operational amplifier module includes: resistor R4, resistor R6, and operational amplifier U1;

[0011] One end of resistor R4 is connected to one end of resistor R3, one end of resistor R6 is connected to the other end of resistor R4, the other end of resistor R6 is connected to the non-inverting input of operational amplifier U1, the inverting input of operational amplifier U1 is connected to the output of operational amplifier U1, the negative power supply terminal of operational amplifier U1 is connected to ground, and the positive power supply terminal of operational amplifier U1 is connected to the input power supply +5V.

[0012] The limiting protection module includes: resistor R5, capacitor C2, diode D2, and diode D1;

[0013] Resistor R5 is connected to one end of resistor R4, one end of resistor R6, the positive terminal of diode D1, and the negative terminal of diode D2. The other end of resistor R5 is connected to the other end of capacitor C2, the positive terminal of diode D2, and ground.

[0014] The power supply filtering module includes: capacitor C3;

[0015] One end of capacitor C3 is connected to the positive power supply terminal of operational amplifier U1, the +5V input power supply, and the other end of capacitor C3 is connected to ground.

[0016] Furthermore,

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The capacitively coupled output design effectively filters high-frequency interference signals. Utilizing the characteristics of capacitors, it blocks unnecessary high-frequency noise, ensuring the purity and stability of the output signal and improving the accuracy of subsequent signal processing. The addition of a clamping diode enables real-time monitoring of the voltage status. When a voltage overshoot occurs, the diode quickly conducts, clamping the voltage within a safe range to prevent damage to core components. This significantly enhances the circuit's reliability and shock resistance, extending its lifespan. The overall circuit design is simple, using fewer components, which reduces circuit complexity and component procurement and assembly costs. While ensuring functional integrity, it offers a cost advantage, facilitating large-scale production and application, and is particularly suitable for cost-sensitive scenarios requiring stable performance. Attached Figure Description

[0019] Figure 1 This is a block diagram of the temperature sampling circuit used in the multi-functional controller for new energy commercial vehicles.

[0020] Figure 2 This is a connection diagram of the temperature sampling circuit used in the multi-functional controller for new energy commercial vehicles. Detailed Implementation

[0021] 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.

[0022] like Figures 1-2 As shown, the technical solution adopted by this utility model is as follows: a temperature sampling circuit for a multi-function controller for new energy commercial vehicles, comprising: a power supply filtering module, an input filtering module, a voltage divider conditioning module, a limiting protection module, and an operational amplifier module.

[0023] The input filtering module is connected to the voltage divider conditioning module, the voltage divider conditioning module is connected to the amplitude limiting protection module, the amplitude limiting protection module is connected to the operational amplifier module, and the operational amplifier module is connected to the power supply filtering module.

[0024] The input filtering module includes: resistor R1 and capacitor C1.

[0025] One end of resistor R1 is connected to the input power supply +5V, and the other end of resistor R1 is connected to one end of capacitor C1. The other end of capacitor C1 is connected to ground.

[0026] The voltage divider conditioning module includes: resistor R2 and resistor R3.

[0027] Resistors R2 and R3 are connected in parallel across capacitor C1.

[0028] The operational amplifier module includes: resistor R4, resistor R6, and operational amplifier U1.

[0029] One end of resistor R4 is connected to one end of resistor R3, one end of resistor R6 is connected to the other end of resistor R4, the other end of resistor R6 is connected to the non-inverting input of operational amplifier U1, the inverting input of operational amplifier U1 is connected to the output of operational amplifier U1, the negative power supply terminal of operational amplifier U1 is connected to ground, and the positive power supply terminal of operational amplifier U1 is connected to the input power supply +5V.

[0030] The limiting protection module includes: resistor R5, capacitor C2, diode D2, and diode D1;

[0031] Resistor R5 is connected to one end of resistor R4, one end of resistor R6, the positive terminal of diode D1, and the negative terminal of diode D2. The other end of resistor R5 is connected to the other end of capacitor C2, the positive terminal of diode D2, and ground.

[0032] The power supply filtering module includes: capacitor C3.

[0033] One end of capacitor C3 is connected to the positive power supply terminal of operational amplifier U1, the +5V input power supply, and the other end of capacitor C3 is connected to ground.

[0034] Capacitor C1 filters out high-frequency interference in the input signal and may also participate in voltage division to adjust the signal amplitude.

[0035] Resistors R2 and R3 form a voltage divider circuit to adjust the input signal voltage to a suitable range to meet the processing requirements of subsequent circuits.

[0036] Resistor R4 is used to transmit signals, connecting the pre-stage filter circuit and the amplitude limiting protection module to ensure stable signal transmission.

[0037] Resistor R5 and capacitor C2 further filter the signal, smooth it, and suppress voltage fluctuations.

[0038] Resistor R6 serves as the signal input resistor, connected to the non-inverting input of operational amplifier U1, and determines the signal amplification factor of operational amplifier U1.

[0039] Capacitor C3 is used for power supply filtering, filtering out high-frequency noise in the +5V power supply and stabilizing the power supply to the operational amplifier.

[0040] Diode D1 provides amplitude limiting protection. When the signal voltage exceeds the safe range, the diode conducts to prevent overvoltage damage to subsequent electronic components.

[0041] Resistor R1 is a thermistor. Based on changes in ambient temperature, the +5V input power supply is divided by resistors R1, R2, and R3, converting the temperature change into a voltage signal. According to the voltage divider formula... After the voltage divider signal is obtained, it is filtered by resistors R4 and R5 and capacitor C2 before entering the non-inverting input of operational amplifier U1. Operational amplifier U1 receives the voltage divider signal. The voltage is then buffered after being filtered by resistors R4 and R5 and capacitor C2, and the output voltage is input to the DSP. Among them, capacitor D1 is a clamping diode, which plays a clamping role in the voltage divider signal, limiting the voltage range, and at the same time protecting the voltage at the non-inverting input terminal of operational amplifier U1 to ≤5V, preventing the operational amplifier U1 from being damaged by overvoltage.

[0042] 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 temperature sampling circuit for a multi-functional controller in new energy commercial vehicles, characterized in that, It includes: power supply filtering module, input filtering module, voltage divider conditioning module, amplitude limiting protection module, and operational amplifier module; The input filtering module is connected to the voltage divider conditioning module, the voltage divider conditioning module is connected to the operational amplifier module, the amplitude limiting protection module is connected to the operational amplifier module, and the operational amplifier module is connected to the power supply filtering module.

2. The temperature sampling circuit for a multi-functional controller for new energy commercial vehicles according to claim 1, characterized in that, The input filtering module includes: resistor R1 and capacitor C1; One end of resistor R1 is connected to the input power supply +5V, and the other end of resistor R1 is connected to one end of capacitor C1. The other end of capacitor C1 is connected to ground.

3. The temperature sampling circuit for a multi-functional controller for new energy commercial vehicles according to claim 2, characterized in that, The voltage divider conditioning module includes: resistor R2 and resistor R3; Resistors R2 and R3 are connected in parallel across capacitor C1.

4. The temperature sampling circuit for a multi-functional controller for new energy commercial vehicles according to claim 3, characterized in that, The operational amplifier module includes: resistor R4, resistor R6, and operational amplifier U1; One end of resistor R4 is connected to one end of resistor R3, one end of resistor R6 is connected to the other end of resistor R4, the other end of resistor R6 is connected to the non-inverting input of operational amplifier U1, the inverting input of operational amplifier U1 is connected to the output of operational amplifier U1, the negative power supply terminal of operational amplifier U1 is connected to ground, and the positive power supply terminal of operational amplifier U1 is connected to the input power supply +5V.

5. The temperature sampling circuit for a multi-functional controller for new energy commercial vehicles according to claim 4, characterized in that, The limiting protection module includes: resistor R5, capacitor C2, diode D2, and diode D1; Resistor R5 is connected to one end of resistor R4, one end of resistor R6, the positive terminal of diode D1, and the negative terminal of diode D2. The other end of resistor R5 is connected to the other end of capacitor C2, the positive terminal of diode D2, and ground.

6. The temperature sampling circuit for a multi-functional controller for new energy commercial vehicles according to claim 4, characterized in that, The power supply filtering module includes: capacitor C3; One end of capacitor C3 is connected to the positive power supply terminal of operational amplifier U1, the +5V input power supply, and the other end of capacitor C3 is connected to ground.