Wire harness monitoring circuit, wire harness monitoring system and electronic equipment

Abstract

The utility model provides a wire harness monitoring circuit, a wire harness monitoring system and electronic equipment. The circuit comprises a voltage detection module and a main control module, wherein the voltage detection module comprises an amplifier module and an ADC module; one end of the amplifier module is connected with first voltage detection pins of any number of power supply harness power supplies and second voltage detection pins of the power supply harness power supplies, the other end of the amplifier module is connected with the input end of the ADC module, and the output end of the ADC module is connected with the main control module; wherein the number of the amplifier modules is the same as that of the power supply wire harnesses. According to the invention, the voltage difference between the two ends of each power supply wire harness is compared with the preset value during monitoring of the power supply wire harnesses of the domain controller, so that the condition that each power supply wire harness is in a normal or open circuit state is obtained, and an alarm is given out through the domain controller. According to the utility model, a single detector can simultaneously monitor the positions of open-circuit harnesses in a plurality of harnesses which work at the same time and accurately position the positions of the open-circuit harnesses, and the circuit safety is greatly improved.

Description

Technical Field

[0001] This application belongs to the technical field of monitoring circuits, and particularly relates to a wire harness monitoring circuit, system and electronic device. Background Art

[0002] During the use of powering the domain controller through a power supply, since the power supply wire harness needs to carry a large current, over time, the situation of aging and open circuit will occur. Therefore, it is necessary to timely detect whether the power supply wire harness is in a normal state or an open circuit state. Currently, the domain controller determines whether the positive power supply wire harness is open by detecting whether the voltage value of the power supply voltage at the board end is equal to 0. If the power supply voltage = 0V, the positive power supply wire harness is open; if the power supply voltage ≠ 0V, the positive power supply wire harness is normal. However, this detection method can only detect that the power supply voltage = 0V when all the positive power supply wire harnesses are open. Then, when n (n < N) positive power supply wire harnesses are open, since there are still (N - n) connected ones, the power supply voltage ≠ 0V, and at this time, the open wire harness cannot be detected. Moreover, the more open wire harnesses there are, the greater the current in each power supply wire harness. Until the current in the power supply wire harness is greater than the maximum current that the wire harness can withstand, the wire harness is very likely to overheat and burn, resulting in a fire accident. Utility Model Content

[0003] Aiming at the defects of the above-mentioned prior art, this application provides a wire harness monitoring circuit, system and electronic device, which realizes that when multiple power supply wire harnesses supply power simultaneously, the specific open power supply wire harness can be detected separately, and a warning is issued through the domain controller, reducing the probability of safety accidents.

[0004] To achieve the above object, this application provides a wire harness monitoring circuit, and the circuit includes:

[0005] A voltage detection module and a main control module; wherein, the voltage detection module includes an amplifier module and an ADC module.

[0006] One end of the amplifier module is connected to the first voltage detection pin of the power supply of any number of power supply wire harnesses and the second voltage detection pin of the power supply of the power supply wire harness. The other end of the amplifier module is connected to the input end of the ADC module, and the output end of the ADC module is connected to the main control module; wherein, the number of amplifier modules is the same as the number of power supply wire harnesses.

[0007] Further, a resistor module is included between any power supply wire harness power supply and the amplifier module. One end of the resistor module is connected to the first voltage detection pin, and the other end of the resistor module is connected to the second voltage detection pin.

[0008] In this application, the other end of any resistor module is also connected to a current detection module.

[0009] In this application, the amplifier module includes at least a differential amplifier.

[0010] The differential amplifier has its third pin connected to the first voltage detection pin, its fourth pin connected to the second voltage detection pin, its sixth pin connected to the VCC power supply, its second and fifth pins grounded, and its first pin connected to the input of the ADC module.

[0011] In this application, the ADC module is used to receive the voltage difference data between the first voltage detection pin and the second voltage detection pin of the differential amplifier, and then output the voltage difference data and the voltage difference signal.

[0012] In this application, the voltage detection module further includes a communication module.

[0013] One end of the communication module is connected to the output of the ADC module, and the other end of the communication module is connected to the main control module.

[0014] In this application, the other end of the communication module includes an SDA interface and an SCL interface; the SDA interface is used to transmit the voltage difference data and voltage difference signal; the SCL interface is used to transmit a high-level signal or a low-level signal.

[0015] In this application, the main control module is used to output a normal signal or an open circuit signal for any power supply harness.

[0016] To achieve the above objectives, this application also provides a wire harness monitoring system, which includes at least the wire harness monitoring circuit described in any of the above descriptions.

[0017] To achieve the above objectives, this application also provides an electronic device, which includes at least the wire harness monitoring system described above.

[0018] Compared with the prior art, the advantages of this application are as follows:

[0019] This application discloses a wiring harness monitoring circuit, system, and electronic device. When multiple power supply harnesses are powered simultaneously, the voltage detection module simultaneously detects the voltage difference between the first voltage detection pin and the second voltage detection pin of each power supply harness and transmits the data to the main control module. After receiving the voltage difference data, the main control module outputs the normal or open circuit status of each power supply harness, accurately locating which specific harness is open, without requiring all harnesses to be open before detection. This enables timely detection and location of potential hazards, avoids overheating and burnout of harnesses due to open circuits, and greatly improves user safety. Attached Figure Description

[0020] Figure 1 This is a structural framework diagram of a wire harness monitoring circuit according to one embodiment of this application.

[0021] Figure 2 This is a schematic diagram of current flow in any resistor module in one embodiment of this application.

[0022] Figure 3 This is a simplified circuit diagram of a wire harness monitoring circuit according to one embodiment of this application.

[0023] Figure 4 This is a circuit diagram of a wire harness monitoring circuit according to one embodiment of this application. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions will be clearly and completely described below in conjunction with the embodiments of this application. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0025] Example 1:

[0026] As attached Figure 1 As shown, in order to solve the above-mentioned technical problems, this application provides a wire harness monitoring circuit, the circuit comprising:

[0027] A voltage detection module and a main control module; wherein the voltage detection module includes an amplifier module and an ADC module.

[0028] It should be noted that when the domain controller is powered by the vehicle-mounted power supply, the supply voltage can be set to VBAT. The current transmission path at the positive terminal of the power supply is: power supply → power supply harness → vehicle-mounted domain controller. Since the total power supply current is relatively large in actual use, this embodiment preferably uses multiple power supply harnesses connected in parallel. In this embodiment, the harness monitoring circuit can be installed in the domain controller to simultaneously monitor the power supply harnesses and promptly locate any open harnesses.

[0029] One end of the amplifier module is connected to the first voltage detection pin and the second voltage detection pin of any number of power supply harnesses, the other end of the amplifier module is connected to the input terminal of the ADC module, and the output terminal of the ADC module is connected to the main control module; wherein the number of amplifier modules is the same as the number of power supply harnesses.

[0030] It should be noted that in this embodiment, the amplifier module is used to obtain the voltage difference data of the voltage detection pin of each power supply line harness, and the ADC module is used to convert the voltage difference data into a digital signal and transmit it to the main control module.

[0031] Furthermore, a resistor module is included between the power supply and the amplifier module in any power supply harness. One end of the resistor module is connected to the first voltage detection pin, and the other end of the resistor module is connected to the second voltage detection pin.

[0032] As attached Figure 2 The diagram shown illustrates the current flow of any resistor module in this embodiment. During actual operation, when current I1 flows through resistor R1 in the resistor module, a voltage difference is generated across resistor R1. P1 refers to the first voltage detection pin, N1 refers to the second voltage detection pin, VBAT+_1 refers to the first PCB trace on the domain controller, corresponding to the first positive power supply harness, and VBAT_1 also refers to the first PCB trace on the domain controller, corresponding to the output terminal of the current from the first positive power supply harness after passing through resistor R1. In this embodiment, a four-pin Kelvin resistor in the mΩ range can be used for the resistor module. Other high-precision resistors can also be used, provided the sampling accuracy is met; there are no limitations on this.

[0033] As attached Figure 3 The diagram shown is a simplified circuit diagram of a wire harness monitoring circuit in an embodiment. PN and NN are a pair of voltage detection pins of the resistor module where any power supply wire harness is located, which are connected to the two ends of the resistor RN. The voltage difference between VBAT+_N and VBAT_N can be detected simultaneously.

[0034] Similarly, when N power supply harnesses are operating simultaneously, VBAT+_2, VBAT+_3, ..., VBAT+_N are N PCB traces on the domain controller, each corresponding to one of the N positive power supply harnesses. R2, R3, ..., RN are N resistor modules. The voltage values ​​of different branches at the same end of resistor RN must remain consistent within the error range. VBAT_2, VBAT_3, ..., VBAT_N are N PCB traces on the domain controller, corresponding to the current in the N positive power supply harnesses, and the output after passing through N high-precision resistors. The voltage detection module simultaneously detects the voltage difference between VBAT+_N and VBAT_N, and reports the detection result of the voltage difference for each pair of power supply harnesses to the main control module. The main control module compares the received voltage difference data with a preset value. When the detected voltage difference data is less than the preset value, it indicates that the corresponding harness is open-circuited.

[0035] In this application, the other end of any of the resistor modules is also connected to a current detection module.

[0036] Preferably, the current detection module can be a digital current sensor, a Hall effect sensor, etc., and is not limited to these.

[0037] It should be noted that, in this embodiment, the total current flowing through the power supply harness is I as measured by the current detection module, and it is transmitted by N positive power supply harnesses, with each power supply harness transmitting a current of I / N. When the VBAT+_N harness is normal, the current flowing through RN is I / N, and the voltage difference between its two ends can be obtained in the amplifier as I / N*RN.

[0038] In this application, the amplifier module includes at least a differential amplifier.

[0039] Preferably, in this embodiment, the differential amplifier can be an INA185A3IDRLR device, or other similar chips can be selected, and it is not limited to this.

[0040] The differential amplifier has its third pin connected to the first voltage detection pin, its fourth pin connected to the second voltage detection pin, its sixth pin connected to the VCC power supply, its second and fifth pins grounded, and its first pin connected to the input of the ADC module.

[0041] It should be noted that in this embodiment, the differential amplifier is used to obtain the voltage difference data, namely VPN-VNN, by combining the current value in the current detection module. The differential amplifier output Vout=G*(VPN-VNN), where G is the amplification factor, and the value of G is determined by the selected differential amplifier.

[0042] In this application, the ADC module is used to receive the voltage difference data between the first voltage detection pin and the second voltage detection pin of the differential amplifier, and then output the voltage difference data and the voltage difference signal.

[0043] Preferably, the ADC module in this embodiment can use ADC chips such as AD7685 and ISL78083, but is not limited to these.

[0044] It should be noted that the ADC detection module is used to receive the voltage difference Vout output by each differential amplifier, convert it from an analog voltage value into a digital signal, and then transmit it to the main control module for processing. The digital signal is the voltage difference signal, which can be represented by high and low level signals.

[0045] In this application, the voltage detection module further includes a communication module. One end of the communication module is connected to the output of the ADC module, and the other end is connected to the main control module.

[0046] Preferably, in this embodiment, the communication module can adopt I2C serial communication hardware components, such as I2C buses of models TCA9555 and PCA9555. In this embodiment, the ADC module and the communication module can be integrated and the ADS7138IRTER chip can be selected. However, it is not limited to these.

[0047] In this application, the other end of the communication module includes an SDA interface and an SCL interface; the SDA interface is used to transmit the voltage difference data and voltage difference signal; the SCL interface is used to transmit a high-level signal or a low-level signal.

[0048] It should be noted that the SDA interface can transmit data via the SDA line, and the SCL interface can also be connected via the SCL line. In I2C communication, the SDA line can be bidirectional, meaning it can both send data to the main control module and receive commands or signals from the main control module. Data on the SDA line is transmitted synchronously with the clock signal on the SCL line.

[0049] The SDA line transmits data including voltage difference data and voltage difference signals. In voltage measurement applications, the SDA line can transmit analog signals generated by the detection circuit, which are then converted from analog to digital and transmitted in digital form on the SDA line.

[0050] In addition, the SCL interface provides a clock signal for synchronizing data transmission on the SDA line. The frequency of the SCL line determines the speed of the I2C bus, and the speed standard can be set to 100kHz, 400kHz, 1MHz, etc., without limitation.

[0051] The high or low level signal transmitted on the SCL line is used for synchronous data transmission. During I2C communication, the SCL line synchronizes data transmission once per clock cycle. The clock signal on the SCL line ensures stable data transmission on the SDA line, avoiding data collisions and errors. Furthermore, the clock frequency of the SCL line can be adjusted as needed to adapt to different application scenarios and communication speed requirements.

[0052] In this embodiment of the application, the main control module is used to output a normal signal or an open circuit signal for any power supply harness.

[0053] It should be noted that in this embodiment, a preset value for the voltage difference can be stored in the main control module beforehand. Then, after receiving the voltage difference data, a simple judgment is performed. This function can be implemented using a voltage comparator chip in the main control module, which compares two voltage values ​​and outputs a high-level or low-level signal to indicate whether one voltage is greater than the other. For example, the LM393 voltage comparator.

[0054] When the detected voltage difference PN-NN is greater than the preset value, it indicates that the corresponding wiring harness is normal; when the detected voltage difference PN-NN is less than the preset value, it indicates that the corresponding wiring harness is open.

[0055] As attached Figure 4 The diagram shown is a schematic of a wire harness monitoring circuit for simultaneous operation of eight power supply wire harnesses in this embodiment. The ADC module and communication module in the diagram utilize integrated chips, but are not limited to these. (See attached diagram.) Figure 4 In the middle, the eight differential amplifiers are named U1, U2, U3, ... U8 in sequence, and the integrated chip is U9.

[0056] Preferably, in this embodiment, the total current I = 12A is detected by the current detection module, the number of power supply harnesses N = 4, which are labeled as harnesses 1 to 4, RN = 1mΩ (N = 1, 2, 3, 4), and the preset value of the voltage difference is 0.5mV.

[0057] Under normal operating conditions, when all four wire harnesses are powered simultaneously, the current in each wire harness is 12A / 4=3A. After flowing through RN (N=1,2,3,4), a voltage difference of 3A*1mΩ=3mV is formed across RN. After detecting P1 / N1, P2 / N2, P3 / N3, and P4 / N4, U1 reports the voltage differences of wire harnesses 1, 2, 3, and 4 (3mV, 3mV, 3mV, 3mV) to the MCU main control module via I2C.

[0058] In actual use, if all four harnesses are powered simultaneously, the MCU main control module detects voltage differences of 4mV, 0mV, 4mV, and 4mV for harnesses 1, 2, 3, and 4, respectively. The voltage difference for harness 2 is 0mV, which is less than the preset value. Therefore, it can be concluded that harness 2 is open-circuited, while the other harnesses are normal. In this case, the main control module can output an open-circuit signal for harness 2, alerting administrators to promptly investigate the anomaly and replace the harness, significantly reducing potential circuit safety hazards.

[0059] In summary, the harness monitoring circuit of this application embodiment can monitor multiple power supply harnesses simultaneously and promptly alarm when an open circuit is detected in a specific power supply harness, thereby facilitating maintenance personnel to respond quickly and replace the faulty harness, ensuring the continuous and stable operation of the system.

[0060] Example 2:

[0061] To address the aforementioned technical problems, this application also proposes a wire harness monitoring system, which includes at least the wire harness monitoring circuit described above.

[0062] It should be noted that the overall architecture of the wiring harness monitoring system in this embodiment may include at least hardware components such as an MCU, ADC, amplifier, and related connectors. The wiring harness monitoring circuit is integrated into the vehicle domain controller, ensuring that all power supply wiring harnesses are connected to the amplifier module and ADC module via resistor modules.

[0063] This embodiment tests the performance of the wire harness monitoring system in a real-world working environment to ensure that all components function properly and that the system can accurately detect and locate the normal or open circuit status of the wire harness. When an open circuit is detected, the system can immediately identify it and issue an alarm, alerting maintenance personnel to handle the situation promptly, thereby preventing further damage or safety incidents.

[0064] In other embodiments, the system can record power supply current and voltage difference data, providing real-time data support for the design and operation of the power supply system and helping to optimize its performance. Through real-time monitoring and timely fault diagnosis, the harness monitoring system provides strong protection for the stability and safety of the power supply system. The harness monitoring system can quickly locate faulty harnesses, reducing the workload of maintenance personnel and improving maintenance efficiency.

[0065] In summary, the wiring harness monitoring system provides strong protection for the reliability and safety of the power supply system through accurate voltage difference detection and real-time data communication, while also improving maintenance efficiency and reducing operating costs. The specific implementation process and principles have been detailed in Example 1 and will not be repeated in this example.

[0066] Example 3:

[0067] This application also provides an electronic device, which includes at least the wiring harness monitoring system described above.

[0068] Preferably, in this embodiment, the electronic device can be an electric vehicle, which can integrate a wiring harness monitoring system to achieve real-time monitoring of the power supply wiring harness. First, this embodiment requires designing the overall architecture of the electric vehicle, determining the location and function of the wiring harness monitoring system within the vehicle, and its interfaces with other vehicle systems. During the manufacturing process of the electric vehicle, the wiring harness monitoring circuit is integrated into the on-board domain controller, ensuring that all power supply wiring harnesses are connected to the amplifier module and ADC module via resistor modules. The performance of the wiring harness monitoring system is tested in a real-world working environment to ensure that all components function properly and can accurately detect open circuits in the wiring harness. This includes real-time monitoring of the power supply wiring harness status, including whether the harness is open-circuited and the distribution of the power supply current. When an open circuit is detected, the electric vehicle can immediately identify it and issue an alarm, alerting the driver or maintenance personnel to handle the situation promptly, thereby preventing further damage or safety accidents.

[0069] In addition, electric vehicles can record data on power supply current and voltage difference, providing real-time data support for the design and operation of the power supply system and helping to optimize the performance of the power supply system.

[0070] In summary, by integrating a wiring harness monitoring system, electric vehicles not only improve the stability and safety of the power supply system, but also enhance maintenance efficiency and user satisfaction, providing an important guarantee for the long-term stable operation of electric vehicles.

[0071] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0072] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this application. It should be understood that the above descriptions are merely specific embodiments of this application and are not intended to limit the scope of protection of this application. In particular, it should be noted that any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application for those skilled in the art.

Claims

1. A wire harness monitoring circuit, characterized in that, include: A voltage detection module and a main control module; wherein the voltage detection module includes an amplifier module and an ADC module; One end of the amplifier module is connected to the first voltage detection pin of any number of power supply harnesses and the second voltage detection pin of the power supply harnesses. The other end of the amplifier module is connected to the input terminal of the ADC module, and the output terminal of the ADC module is connected to the main control module. The number of amplifier modules is the same as the number of power supply harnesses.

2. The wire harness monitoring circuit according to claim 1, characterized in that, A resistor module is included between the power supply and the amplifier module in any power supply harness. One end of the resistor module is connected to the first voltage detection pin, and the other end of the resistor module is connected to the second voltage detection pin.

3. The wire harness monitoring circuit according to claim 1, characterized in that, The other end of any resistor module is also connected to a current detection module.

4. The wire harness monitoring circuit according to claim 1, characterized in that, The amplifier module includes at least a differential amplifier; The third pin of the differential amplifier is connected to the first voltage detection pin, the fourth pin of the differential amplifier is connected to the second voltage detection pin, the sixth pin of the differential amplifier is connected to the VCC power supply terminal, the second and fifth pins of the differential amplifier are grounded respectively, and the first pin of the differential amplifier is connected to the input terminal of the ADC module.

5. A wire harness monitoring circuit according to claim 1, characterized in that, The ADC module is used to receive the voltage difference data between the first voltage detection pin and the second voltage detection pin of the differential amplifier, and to output the voltage difference data and the voltage difference signal.

6. A wire harness monitoring circuit according to claim 1, characterized in that, The voltage detection module also includes a communication module; One end of the communication module is connected to the output of the ADC module, and the other end of the communication module is connected to the main control module.

7. A wire harness monitoring circuit according to claim 6, characterized in that, The other end of the communication module includes an SDA interface and an SCL interface; The SDA interface is used to transmit voltage difference data and voltage difference signals; The SCL interface is used to transmit high-level signals or low-level signals.

8. A wire harness monitoring circuit according to claim 1, characterized in that, The main control module is used to output a normal signal or an open circuit signal for any power supply harness.

9. A wire harness monitoring system, characterized in that, It includes at least the wire harness monitoring circuit as described in any one of claims 1 to 8.

10. An electronic device, characterized in that, It includes at least the harness monitoring system as described in claim 9.

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