A double-channel electric vehicle charging equipment online monitoring device

Abstract

The utility model discloses a kind of double-channel electric vehicle charging equipment online monitoring devices, involve online monitoring field, including current sampling module, voltage sampling module, filter circuit, 4G communication, RS485 serial communication, temperature acquisition module, power supply circuit module, magnetic isolation chip, processor and pulse output module composition, two groups of current sampling module and voltage sampling module respectively constitute two groups of detection channel, the voltage sampling module is with high-precision low-temperature drift resistance and sampling circuit composition, the output end of sampling circuit is connected with the input end of filter circuit, the output end of filter circuit is connected with the input end of high-precision measurement chip.The utility model, satisfy the voltage, current, electric quantity of charging pile are carried out remote real-time monitoring, satisfy the voltage, current, electric quantity of double-gun charging pile are measured simultaneously, to reduce input cost, improve the efficiency of verification, improve the supervision strength of charging pile measurement state.

Description

Technical Field

[0001] This utility model relates to the field of online monitoring technology, and in particular to an online monitoring device for dual-channel electric vehicle charging equipment. Background Technology

[0002] With the increasing popularity of new energy vehicles, the number and usage frequency of charging piles are constantly increasing, which also brings challenges to the measurement, safety testing, and management of electric vehicle charging piles. Currently, the testing method for electric vehicle charging piles mostly involves professionals taking high-precision electrical testing instruments to the site for measurement.

[0003] In the current technology, charging equipment is divided into AC charging equipment, DC charging equipment, single-gun charging equipment, and dual-gun charging equipment. There are many types of equipment, and the charging equipment is scattered, so the on-site testing operation is cumbersome. Professionals need to carry a lot of testing equipment, resulting in high investment costs and low efficiency in the metrological testing of charging equipment. Moreover, current metrological verification is mostly offline verification, and the metrological status of charging piles is not monitored during the verification period, which poses potential risks. Therefore, there is a need for a dual-channel online monitoring device for electric vehicle charging equipment to meet people's needs. Utility Model Content

[0004] The purpose of this utility model is to provide an online monitoring device for dual-channel electric vehicle charging equipment, so as to solve the problems mentioned in the background art, such as high cost and low efficiency of the metering and testing of charging equipment, and that current metering verification is mostly offline verification, and the metering status of charging piles is not monitored during the verification period, which poses potential risks.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a dual-channel electric vehicle charging equipment online monitoring device, comprising a current sampling module, a voltage sampling module, a filtering circuit, 4G communication, RS485 serial communication, a temperature acquisition module, a power supply circuit module, a magnetic isolation chip, a processor, and a pulse output module; The two sets of current sampling modules and voltage sampling modules form two detection channels respectively. The voltage sampling module is composed of a high-precision low-temperature drift resistor and a sampling circuit. The output of the sampling circuit is connected to the input of the filter circuit. The output of the filter circuit is connected to the input of the high-precision metering chip. The output of the metering chip is connected to the input of the magnetic isolation chip. The output of the magnetic isolation chip is connected to the input of the processor. The current sampling module consists of a high-precision fluxgate current sensor. The output of the fluxgate current sensor is connected to the input of a filter circuit. The output of the filter circuit is connected to the input of a metering chip. The output of the metering chip is connected to the input of a magnetic isolation chip. The output of the magnetic isolation chip is connected to the input of a processor.

[0006] Preferably, both the voltage sampling module and the current sampling module can acquire dual-channel current and voltage data, and both the voltage sampling module and the current sampling module can acquire AC and DC current and voltage.

[0007] Preferably, the filter circuit of the current channel and the filter circuit of the voltage channel have the same circuit structure, both being active filters.

[0008] Preferably, the 4G communication uses an EC800G 4G module.

[0009] Preferably, the RS485 communication module connects the processor and the external communication interface.

[0010] Preferably, the high-precision metering chip is the RN8209D chip.

[0011] Preferably, the temperature acquisition module samples the DS18B20 module, and the processor is directly connected to the DS18B20 module to acquire temperature data.

[0012] Preferably, the power supply circuit module uses an isolated power supply scheme. The power supply circuit module can convert +12V power into two ±15V power supplies to power the two acquisition channel hardware. The isolated power supply scheme ensures that the two circuits are isolated and do not interfere with each other.

[0013] Preferably, the processor is a microcontroller with a 32-bit Cortex M4 core.

[0014] Preferably, one end of the pulse output module is connected to the processor pulse output terminal, and the other end is connected to the magnetic isolation chip input terminal.

[0015] The beneficial effects of this utility model are: This invention enables remote real-time monitoring of the voltage, current, and power of charging piles, and allows for simultaneous measurement of the voltage, current, and power of dual-gun charging piles, thereby reducing investment costs, improving verification efficiency, and enhancing the supervision of the metering status of charging piles. Attached Figure Description

[0016] Figure 1 This is a block diagram of an online monitoring system for a dual-channel electric vehicle charging device proposed in this utility model; Figure 2 This is a schematic diagram of the metering chip sampling circuit of an online monitoring device for dual-channel electric vehicle charging equipment proposed in this utility model; Figure 3 This is a schematic diagram of the power supply circuit module of an online monitoring device for dual-channel electric vehicle charging equipment proposed in this utility model; Figure 4This is a schematic diagram of the 4G module working circuit of an online monitoring device for dual-channel electric vehicle charging equipment proposed in this utility model; Figure 5 This is a schematic diagram of the pulse output circuit module of an online monitoring device for dual-channel electric vehicle charging equipment proposed in this utility model. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0018] Reference Figure 1 A dual-channel online monitoring device for electric vehicle charging equipment comprises a current sampling module, a voltage sampling module, a filter circuit, 4G communication, RS485 serial communication, a temperature acquisition module, a power supply circuit module, a magnetic isolation chip, a processor, and a pulse output module. The two sets of current sampling modules and voltage sampling modules form two detection channels respectively. The voltage sampling module is composed of a high-precision low-temperature drift resistor and a sampling circuit. The output of the sampling circuit is connected to the input of the filter circuit. The output of the filter circuit is connected to the input of the high-precision metering chip. The output of the metering chip is connected to the input of the magnetic isolation chip. The output of the magnetic isolation chip is connected to the input of the processor. The current sampling module consists of a high-precision fluxgate current sensor. The output of the fluxgate current sensor is connected to the input of a filter circuit. The output of the filter circuit is connected to the input of a metering chip. The output of the metering chip is connected to the input of a magnetic isolation chip. The output of the magnetic isolation chip is connected to the input of a processor. Furthermore, both the voltage sampling module and the current sampling module can acquire dual-channel current and voltage data, and both the voltage sampling module and the current sampling module can acquire AC and DC current and voltage.

[0019] Furthermore, the filter circuit of the current channel and the filter circuit of the voltage channel have the same circuit structure, both being active filters.

[0020] Furthermore, the 4G communication uses the EC800G 4G module, which has a built-in cryptographic algorithm hardware acceleration engine to ensure secure wireless data transmission.

[0021] Furthermore, the RS485 communication module connects the processor and the external communication interface.

[0022] Furthermore, the high-precision metering chip uses the RN8209D chip, which can convert the AC and DC analog signals output from the current sampling module and the voltage sampling module into digital signals.

[0023] Furthermore, the temperature acquisition module samples the DS18B20 module, and the processor is directly connected to the DS18B20 module to acquire temperature data.

[0024] Furthermore, the power supply circuit module uses an isolated power supply scheme. The power supply circuit module can convert +12V power into two ±15V power supplies to power the two acquisition channel hardware. The isolated power supply scheme ensures that the two circuits are isolated and do not interfere with each other.

[0025] Furthermore, the processor is a 32-bit Cortex M4 core microcontroller.

[0026] Furthermore, one end of the pulse output module is connected to the processor's pulse output terminal, and the other end is connected to the magnetic isolation chip's input terminal.

[0027] I. Voltage Sampling Module The voltage sampling module can measure up to 1500V DC voltage or 1000V AC voltage. The sampling circuit is assembled from voltage divider resistors, sampling resistors, and high-voltage protection circuits. Both the voltage divider resistors and the sampling resistors are high-precision, low-temperature-drift resistors with low temperature coefficients and high accuracy, exhibiting a temperature drift of ±25ppm / ℃.

[0028] One end of the voltage divider resistor is connected to the sampling voltage input terminal, and the other end is connected to the sampling resistor. There is a voltage sampling point between the voltage divider resistor and the sampling resistor. The obtained sampling voltage is transmitted to the amplification and adjustment circuit module through the sampling resistor and the precision operational amplifier.

[0029] II. Current Sensor This current sensor is a fluxgate current sensor. It employs a multi-closed-loop control system, including an excitation flux closed-loop control module and a multi-flux closed-loop control module. The excitation flux closed-loop control module detects the target excitation magnetic field generated by the excitation unit. The multi-flux closed-loop control module detects the AC and high-frequency magnetic fields generated by the current under test and generates AC and high-frequency flux compensation signals based on the detected AC and high-frequency flux signals. The multi-flux closed-loop control module also generates a DC bias compensation signal based on the DC bias signal, and generates a target multi-flux compensation signal based on the AC and high-frequency flux compensation signals and the DC bias compensation signal. Based on the target multi-flux compensation signal, a multi-flux compensation magnetic field is generated around the circuit under test. The multi-flux compensation magnetic field is superimposed with the DC and AC magnetic fields. The flux of the superimposed multi-flux magnetic field passing through a plane perpendicular to its magnetic field lines is zero, thereby eliminating the magnetic field interference generated by the excitation module. This achieves the detection of both AC and DC currents, improves the current detection accuracy of the sensor, and reduces the production cost of the sensor.

[0030] Metering chip circuit This metering chip, as a key circuit for detecting current and voltage, uses a design with two sets of metering chips, which can meet the simultaneous detection of current and voltage through dual channels, and the data between the two channels do not interfere with each other. Figure 4 This is the sampling circuit for the second metering chip. CH1_V1P is responsible for acquiring the current sampling signal of the first channel, and CH1_V1P is connected to the input terminal of the corresponding active filter circuit for the first channel current. CH1_V3P is responsible for acquiring the voltage sampling signal of the first channel, and CH1_V3P is connected to the input terminal of the corresponding active filter circuit for the first channel voltage. CH1_RX and CH1_TX are connected to the isolation chip, which is connected to the processor to enable digital communication between the metering chip and the processor. The CH1_PF circuit network is connected to the isolation chip, which is connected to the pulse input interface circuit to achieve the output of energy pulses.

[0031] IV. 4G Communication Module The 4G communication module, a crucial component of this device, is essential for online testing. This 4G module utilizes the EC800G 4G module, enabling 4G remote communication. The 4G module operates on a 3.8V power supply. Figure 3 U5 in the circuit is a power chip. By adjusting the resistance values ​​of R12 and R13, the +12V power supply voltage of the device can be converted to 3.8V to power the 4G module. Figure 4 This is the 4G module's working circuit. 4G_RX and 4G_TX are connected to the processor. The processor sends current, voltage, and power data to the 4G module through 4G_RX and 4G_TX. The 4G module then transmits the data to the detection platform. U2 is the 4G antenna, which enhances the 4G communication signal.

[0032] V. Pulse Output Module The pulse output circuit module is isolated from the metering chip via an optocoupler chip, effectively ensuring the product's reliability and stability. As a key circuit for the device's own power pulse detection, the pulse output circuit is designed to enhance the rapid transmission and amplification of signals, while also incorporating self-protection mechanisms in case of abnormal connections with external testing equipment. The specific circuit is as follows... Figure 5 In the diagram, Q1 and Q2 amplify the signal for rapid transmission, while MZ3, MZ1, TVS2, and TVS3 act as protection devices to protect the pulse circuit.

[0033] V. Other Modules: The processor uses a microcontroller with an ARM Cortex-M4 core that supports floating-point operations. It runs at a clock speed of up to 168MHz and has a DSP instruction set, which can meet various complex signal processing and calculation functions.

[0034] An active filter circuit consists of integrated operational amplifiers, resistors, capacitors, and other components. It can highlight useful frequency signals and attenuate useless frequency signals, suppressing interference and noise to improve measurement accuracy.

[0035] The temperature acquisition module uses the DS18B20 module. The processor is directly connected to the DS18B20 module to collect temperature data. The temperature data can be used to monitor the internal temperature of the charging pile, and then the electrical parameters can be adjusted according to the temperature to improve the sampling accuracy.

[0036] The power supply circuit module uses an isolated power supply scheme, which can convert +12V power into two ±15V power supplies to power the two acquisition channel hardware.

[0037] The serial communication module integrates an RS485 communication module, which can meet the requirements of direct communication with other devices under normal circumstances.

[0038] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An online monitoring device for dual-channel electric vehicle charging equipment, characterized in that, It consists of a current sampling module, a voltage sampling module, a filtering circuit, 4G communication, RS485 serial communication, a temperature acquisition module, a power supply circuit module, a magnetic isolation chip, a processor, and a pulse output module; The two sets of current sampling modules and voltage sampling modules form two detection channels respectively. The voltage sampling module is composed of a high-precision low-temperature drift resistor and a sampling circuit. The output of the sampling circuit is connected to the input of the filter circuit. The output of the filter circuit is connected to the input of the high-precision metering chip. The output of the metering chip is connected to the input of the magnetic isolation chip. The output of the magnetic isolation chip is connected to the input of the processor. The current sampling module consists of a high-precision fluxgate current sensor. The output of the fluxgate current sensor is connected to the input of a filter circuit. The output of the filter circuit is connected to the input of a metering chip. The output of the metering chip is connected to the input of a magnetic isolation chip. The output of the magnetic isolation chip is connected to the input of a processor.

2. The online monitoring device for a dual-channel electric vehicle charging equipment according to claim 1, characterized in that: Both the voltage sampling module and the current sampling module can acquire dual-channel current and voltage data, and both the voltage sampling module and the current sampling module can acquire AC and DC current and voltage.

3. The online monitoring device for dual-channel electric vehicle charging equipment according to claim 1, characterized in that: The filter circuit for the current channel and the filter circuit for the voltage channel have the same circuit structure; both are active filters.

4. The online monitoring device for a dual-channel electric vehicle charging equipment according to claim 1, characterized in that: The 4G communication uses the EC800G 4G module.

5. The online monitoring device for a dual-channel electric vehicle charging equipment according to claim 1, characterized in that: The RS485 communication module connects the processor and the external communication interface.

6. The online monitoring device for a dual-channel electric vehicle charging equipment according to claim 1, characterized in that: The high-precision metering chip uses the RN8209D chip.

7. The online monitoring device for a dual-channel electric vehicle charging equipment according to claim 1, characterized in that: The temperature acquisition module samples the DS18B20 module, and the processor is directly connected to the DS18B20 module to acquire temperature data.

8. The online monitoring device for a dual-channel electric vehicle charging equipment according to claim 1, characterized in that: The power supply circuit module uses an isolated power supply scheme. The power supply circuit module can convert +12V power into two ±15V power supplies to power the two acquisition channel hardware. The isolated power supply scheme ensures that the two circuits are isolated and do not interfere with each other.

9. The online monitoring device for a dual-channel electric vehicle charging equipment according to claim 1, characterized in that: The processor is a microcontroller with a 32-bit Cortex M4 core.

10. The online monitoring device for a dual-channel electric vehicle charging equipment according to claim 1, characterized in that: One end of the pulse output module is connected to the processor's pulse output terminal, and the other end is connected to the magnetic isolation chip's input terminal.

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