CN220188641U - Dual-communication interface insulation monitoring module - Google Patents
Dual-communication interface insulation monitoring module Download PDFInfo
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- CN220188641U CN220188641U CN202321240951.7U CN202321240951U CN220188641U CN 220188641 U CN220188641 U CN 220188641U CN 202321240951 U CN202321240951 U CN 202321240951U CN 220188641 U CN220188641 U CN 220188641U
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- 238000004891 communication Methods 0.000 title claims abstract description 65
- 238000009413 insulation Methods 0.000 title claims abstract description 49
- 238000012544 monitoring process Methods 0.000 title claims abstract description 22
- 238000001514 detection method Methods 0.000 claims abstract description 20
- 238000012545 processing Methods 0.000 claims abstract description 14
- 230000003993 interaction Effects 0.000 claims abstract description 10
- 238000002955 isolation Methods 0.000 claims description 15
- 230000009977 dual effect Effects 0.000 claims description 8
- 238000005070 sampling Methods 0.000 claims description 5
- 238000012795 verification Methods 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000004044 response Effects 0.000 abstract description 4
- 238000005259 measurement Methods 0.000 abstract description 3
- 230000003137 locomotive effect Effects 0.000 abstract description 2
- 238000002360 preparation method Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000012806 monitoring device Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
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Abstract
The utility model discloses a double-communication interface insulation monitoring module, which comprises: the MCU is used for processing various signals and executing control instructions; an insulation resistor and bus high-voltage detection unit connected with the MCU unit; the RS485 communication unit is connected with the MCU unit and used for enabling the MCU unit to perform data interaction outwards; the CAN communication unit is connected with the MCU unit and used for enabling the MCU unit to perform data interaction outwards; the firmware updating unit is connected with the MCU unit and used for monitoring equipment firmware updating; and the power management unit is respectively connected with the MCU unit and the insulation resistor and bus high-voltage detection unit. The utility model has the advantages of low preparation cost, high measurement precision, high response speed and good working stability, and effectively ensures the personal safety of related personnel such as electric vehicles, charging devices and the like and the operation safety of locomotives.
Description
Technical Field
The utility model relates to the technical field of high-voltage equipment protection, in particular to a double-communication-interface insulation monitoring module.
Background
With the rapid development of electric vehicles, high-voltage electric devices such as high-voltage batteries and charging piles are widely used. The electric automobile adopts a high-capacity lithium ion battery, the working voltage can reach 300V-800V, and the full charge current can reach hundreds of amperes. In order to improve the charging efficiency, the output voltage and current of the quick charging pile are larger, and the electric automobile can be charged in a short time. The voltage and current output by the high-voltage electric devices far exceed the maximum safe voltage and current values which can be borne by human bodies, once the devices have insulation faults or are out of control, large current can easily pass through the human bodies to cause contact damage and even death, and excessive temperature can cause overheat and fire of a system to endanger the safety of surrounding devices and personnel, and even fire and explosion can occur when serious.
Meanwhile, as an emerging technology and product, the reliability and safety of the electric automobile and the charging pile need to be further improved. If the insulation performance of the high-voltage system is reduced, a great hidden danger is formed for personnel and equipment safety. Therefore, the electric system of high-voltage equipment such as electric automobiles, charging piles and the like needs to be monitored in real time, and once the insulation fault condition is monitored, the alarm is needed to be given out timely and corresponding measures are taken, so that the accident is avoided, and the safety of personnel and equipment is ensured to the greatest extent. Therefore, the development of the insulation monitoring system with high precision and high response speed is a technical problem to be solved in the development process of the current electric automobile. The insulation monitoring system can accurately judge the insulation state of the high-voltage system, give an alarm at the first time, and provide technical support for safe operation of the electric automobile and the charging station.
The existing insulation monitoring system adopts a simple resistance measurement method to judge the insulation state, and cannot accurately monitor multiple paths of signals. In addition, the systems are easily affected by temperature and humidity, false alarm or missing alarm is generated, the working stability is poor, and the safety monitoring requirements of equipment such as electric automobiles are difficult to meet.
To this end, the present inventors have found a method for solving the above-mentioned problems through beneficial studies and studies, and the technical solutions to be described below are made in this context.
Disclosure of Invention
The technical problems to be solved by the utility model are as follows: aiming at the defects of the prior art, the double-communication-interface insulation monitoring module is high in monitoring precision, stable and well-defined in working, high in response speed and low in cost.
The technical problems to be solved by the utility model can be realized by adopting the following technical scheme:
a dual communication interface insulation monitoring module, comprising:
the MCU is used for processing various signals and executing control instructions;
the insulation resistance and bus high voltage detection unit is connected with the MCU unit and is used for collecting the insulation resistance to ground and bus high voltage of the positive and negative poles of the bus in a mode of dynamically switching the bias resistance through the bridge and transmitting the collected resistance signals and voltage signals to the MCU unit for processing;
the RS485 communication unit is connected with the MCU unit and used for enabling the MCU unit to perform data interaction outwards;
the CAN communication unit is connected with the MCU unit and used for enabling the MCU unit to perform data interaction outwards;
the firmware updating unit is connected with the MCU unit and is used for receiving firmware updating information from an external system through the RS485 unit and/or the CAN communication unit, transmitting the received firmware updating information to the MCU unit for verification, and completing control of firmware updating of the monitoring equipment; and
and the power management unit is respectively connected with the MCU unit and the insulation resistor and bus high-voltage detection unit.
In a preferred embodiment of the present utility model, the insulation resistor and bus high voltage detection unit includes a bias resistor, a second-order active low-pass filter and an analog-to-digital converter, where the insulation resistor and bus high voltage detection unit forms a balanced bridge with different resistance values by rapidly switching the bias resistor, samples the bus, processes a sampling signal through the second-order active low-pass filter, inputs the sampling signal to the analog-to-digital converter for conversion, and outputs the sampling signal to the MCU for data processing.
In a preferred embodiment of the utility model, the RS485 communication unit is powered by a first isolating DC-DC power supply, and a first magnetic isolating device for electrical isolation is arranged between the RS485 communication unit and the MCU unit.
In a preferred embodiment of the present utility model, the RS485 communication unit supports communication parameter configuration and supports MODBUD-RTU protocol communication.
In a preferred embodiment of the utility model, the CAN communication unit is powered by a second isolated DC-DC power supply and a second magnetic isolation device for electrical isolation is arranged between the CAN communication unit and the MCU unit.
In a preferred embodiment of the present utility model, the CAN communication unit supports configuration of communication parameters such as cand, baud rate, etc.
Due to the adoption of the technical scheme, the utility model has the beneficial effects that:
1. the utility model adopts a bridge balance method of dynamically and rapidly switching bias resistors to realize accurate measurement of the insulation resistance of the positive electrode and the negative electrode of the bus to the ground, has the functions of detecting the high voltage and the negative voltage of the bus, and can timely find out the reverse connection problem of the power supply;
2. the utility model has two paths of communication interface units for simultaneous communication and is quickly adapted to various occasions;
3. the utility model has two paths of communication interface unit firmware updating, thus realizing the rapid updating of the system firmware;
4. the utility model has the advantages of low preparation cost, high measurement precision, high response speed and good working stability, and effectively ensures the personal safety of related personnel such as electric vehicles, charging devices and the like and the operation safety of locomotives.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural view of the present utility model.
Detailed Description
The utility model is further described with reference to the following detailed drawings in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the implementation of the utility model easy to understand.
Referring to fig. 1, a dual communication interface insulation monitoring module is shown, which includes an MCU unit 100, an insulation resistance and bus high voltage detection unit 200, an RS485 communication unit 300, a CAN communication unit 400, a firmware update unit 500, and a power management unit 600.
The MCU unit 100 is used for processing various signals and executing control instructions, and is specifically responsible for processing insulation resistance signals and voltage signals provided by the insulation resistance and bus high voltage detection unit 200, performing communication data interaction with external master control equipment through the RS485 communication unit 300 and the CAN communication unit 400, and managing firmware upgrading functions through the firmware updating unit 500. In this embodiment, the MCU unit 100 preferably employs STM32L4 series low power chips.
The insulation resistance and bus high voltage detection unit 200 is connected with the MCU unit, and is used for collecting the insulation resistance and bus high voltage of the positive and negative poles of the bus to the ground in a mode of dynamically switching the bias resistance through a bridge, and transmitting the collected resistance signals and voltage signals to the MCU unit for processing. Specifically, the insulation resistor and bus high voltage detection unit 200 includes a bias resistor, a second-order active low-pass filter and an analog-to-digital converter, and the insulation resistor and bus high voltage detection unit 200 samples the bus by forming a balance bridge with different resistance values through fast switching the bias resistor, and the sampled signal is processed by the second-order active low-pass filter, is input to the analog-to-digital converter for conversion processing, and is output to the MCU unit 100 for data processing. The MCU unit 100 can determine the current source insulation condition and source voltage state according to the insulation resistance and the insulation resistance value and the voltage data provided by the bus high voltage detection unit 200, and give an alarm signal in time when there is an abnormality. Meanwhile, the insulation resistance and bus high voltage detection unit 200 also supports whether the positive and negative poles of the bus are reversely connected or not, and sends the judgment result to the MCU unit 100 for processing.
The RS485 communication unit 300 is connected with the MCU unit 100, and is used for enabling the MCU unit 100 to perform data interaction externally. In this embodiment, the RS485 communication unit 300 supplies power by isolating the DC-DC power, and a magnetic isolation device for electrical isolation is provided between the RS485 communication unit 300 and the MCU unit 100, so that communication security is improved. Meanwhile, the RS485 communication unit 300 supports communication parameter configuration and MODBUS-RTU protocol communication.
The CAN communication unit 400 is connected with the MCU unit 100, and is used for enabling the MCU unit 100 to perform data interaction to the outside. In an embodiment, the CAN communication unit 400 is powered by isolating the DC-DC power supply, and a magnetic isolation device for electrical isolation is provided between the CAN communication unit 400 and the MCU unit 100, thereby improving communication security. Meanwhile, the CAN communication unit 400 supports communication parameter configuration such as CANID, baud rate, and the like.
The firmware updating unit 500 is connected with the MCU unit 100, and is configured to receive firmware updating information from an external system through the RS485 unit 300 and/or the CAN communication unit 400, and transmit the received firmware updating information to the MCU unit 100 for verification, so as to complete control of firmware updating of the monitoring device. In this embodiment, the firmware update unit 500 monitors the firmware update commands of the RS485 unit 300 and the CAN communication unit 400, when receiving the firmware update command, the MCU unit 100 jumps to the update program, checks the received firmware update package, writes the firmware update package into the application program storage area of the MCU unit 100 after error-free until the update is completed, and jumps to the application program area execution code.
The power management unit 600 is connected with the MCU unit and the insulation resistor and bus high voltage detection unit, respectively. Specifically, the power management unit 600 includes an external power source, a protection device, an isolation transformer, and a DC-DC converter, where the protection device is composed of a reverse diode, a varistor, a TVS tube, a high-frequency filter capacitor, a self-recovery fuse, and the like, the input end of the protection device is connected to the external power source, the output end of the protection device is connected to the input end of the protection device, the input end of the isolation transformer is connected to the output end of the protection device, the output end of the isolation transformer is connected to the input end of the DC-DC converter, and the output end of the DC-DC converter is connected to the MCU unit 100 and the insulation resistor and bus high voltage detection unit 200, respectively. The power management unit 600 converts the voltage output from the external power source into the voltage required by each unit through the protection device, the isolation transformer and the DC-DC converter, and provides full power for each unit.
The working principle of the double-communication interface insulation monitoring module is as follows:
the power management unit 600 provides working voltages for all units, the insulation resistor and bus high-voltage detection unit 200 is connected to a bus and is connected to the MCU unit 100 through an internal bus, the MCU unit 100 is connected with an external controller through the RS485 communication unit 300 and/or the CAN communication unit 400 for information interaction, the firmware update unit 500 receives firmware update information from an external device through the RS485 communication unit 300 and/or the CAN communication unit 400, and the firmware update information is transmitted to the MCU unit 100 for verification and then the control of firmware update of the monitoring device is completed.
The foregoing has shown and described the basic principles and main features of the present utility model and the advantages of the present utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which is defined in the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (6)
1. A dual communication interface insulation monitoring module, comprising:
the MCU is used for processing various signals and executing control instructions;
the insulation resistance and bus high voltage detection unit is connected with the MCU unit and is used for collecting the insulation resistance to ground and bus high voltage of the positive and negative poles of the bus in a mode of dynamically switching the bias resistance through the bridge and transmitting the collected resistance signals and voltage signals to the MCU unit for processing;
the RS485 communication unit is connected with the MCU unit and used for enabling the MCU unit to perform data interaction outwards;
the CAN communication unit is connected with the MCU unit and used for enabling the MCU unit to perform data interaction outwards;
the firmware updating unit is connected with the MCU unit and is used for receiving firmware updating information from an external system through the RS485 unit and/or the CAN communication unit, transmitting the received firmware updating information to the MCU unit for verification, and completing control of firmware updating of the monitoring equipment; and
and the power management unit is respectively connected with the MCU unit and the insulation resistor and bus high-voltage detection unit.
2. The dual communication interface insulation monitoring module according to claim 1, wherein the insulation resistor and bus high voltage detection unit comprises a bias resistor, a second-order active low-pass filter and an analog-to-digital converter, the insulation resistor and bus high voltage detection unit is used for sampling buses by forming a balance bridge with different resistance values through fast switching of the bias resistor, and sampling signals are processed through the second-order active low-pass filter, input to the analog-to-digital converter for conversion processing and output to the MCU unit for data processing.
3. The dual communication interface insulation monitoring module of claim 1, wherein the RS485 communication unit is powered by a first isolated DC-DC power supply, and a first magnetic isolation device for electrical isolation is provided between the RS485 communication unit and the MCU unit.
4. The dual communication interface insulation monitoring module of claim 3, wherein the RS485 communication unit supports communication parameter configuration and supports MODBUD-RTU protocol communication.
5. The dual communication interface insulation monitoring module of claim 1, wherein the CAN communication unit is powered by a second isolated DC-DC power supply and a second magnetic isolation device for electrical isolation is provided between the CAN communication unit and the MCU unit.
6. The dual communication interface insulation monitoring module of claim 5, wherein the CAN communication unit supports CANID, baud rate communication parameter configuration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321240951.7U CN220188641U (en) | 2023-05-22 | 2023-05-22 | Dual-communication interface insulation monitoring module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321240951.7U CN220188641U (en) | 2023-05-22 | 2023-05-22 | Dual-communication interface insulation monitoring module |
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| Publication Number | Publication Date |
|---|---|
| CN220188641U true CN220188641U (en) | 2023-12-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321240951.7U Active CN220188641U (en) | 2023-05-22 | 2023-05-22 | Dual-communication interface insulation monitoring module |
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| CN (1) | CN220188641U (en) |
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- 2023-05-22 CN CN202321240951.7U patent/CN220188641U/en active Active
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