Internet of Things wireless monitoring device of frequency converter

Abstract

The utility model relates to the technical field of Internet of Things communication, in particular to an Internet of Things wireless monitoring device of a frequency converter, which can improve debugging convenience and safety, and comprises a Bluetooth module embedded in the frequency converter, the Bluetooth module comprises a PCB (printed circuit board), the PCB is provided with a Bluetooth chip, a single chip microcomputer chip and an IPEX antenna, and the single chip microcomputer chip is connected with the IPEX antenna. The single-chip microcomputer chip communicates with the Bluetooth chip through a TXD pin and an RXD pin, the single-chip microcomputer chip is connected with a single-chip microcomputer of the frequency converter through a UART standard serial interface, and the IPEX antenna is used for wirelessly communicating with a smart phone or a tablet personal computer.

Description

Technical Field

[0001] The utility model relates to the technical field of Internet of Things communication, in particular to an Internet of Things wireless monitoring device for a frequency converter. Background Art

[0002] Frequency converters have been very popular in industrial applications. Especially for the current high requirements of energy conservation and load accuracy, they are indispensable equipment. Among the devices with the highest usage frequency in system debugging and monitoring, in addition to PLCs, frequency converters are also widely used. Debugging frequency converters has always been a job with high technical content and high risk. Especially for high-power or medium-voltage equipment, engineers have to get close to the frequency converter and manually operate the button panel on the frequency converter.

[0003] When debugging the frequency converter through the panel or performing maintenance work, the modification of the client function code parameters can only be operated by pressing the keyboard keys one by one. And when it comes to monitoring the running state between the frequency converter and the load, the content displayed by a single digital tube or LCD screen is also limited. Especially when professional technicians are not on site, it is also an obstacle for on-site technicians to operate the complex frequency converter panel or intercept information. With the development of frequency converters, as the power and voltage level increase, technicians' on-site close-range debugging poses risks to their own work. In large-scale equipment, such as frequency converters above 500kW and equipment with a voltage level of 10KVA, in case of working conditions accidents such as electric leakage and voltage arcing during the debugging process, it is very difficult for technicians to react in the first time, posing great potential safety hazards. Summary of the Invention

[0004] In order to solve the above technical problems, the utility model provides an Internet of Things wireless monitoring device for a frequency converter, which can improve the debugging convenience and safety.

[0005] Its technical solution is as follows: an Internet of Things wireless monitoring device for a frequency converter, characterized in that it includes a Bluetooth module embedded in the frequency converter. The Bluetooth module includes a PCB board, on which a Bluetooth chip, a single-chip microcomputer chip, and an IPEX antenna are installed. The single-chip microcomputer chip communicates with the Bluetooth chip through TXD and RXD pins. The single-chip microcomputer chip is connected to the single-chip microcomputer of the frequency converter by using a UART standard serial interface. The IPEX antenna is used for wireless communication with a smart phone or a tablet computer.

[0006] It is further characterized in that the model of the Bluetooth chip is nRF52832@Nordic;

[0007] A metal shielding cover with an elliptical opening is provided at the IPEX antenna;

[0008] A surrounding shielding layer is provided on the periphery of the PCB board;

[0009] An L-shaped magnetic ring and an X capacitor are provided at the power connection of the PCB board.

[0010] After adopting the present utility model, the Bluetooth chip and the IPEX antenna can be used to perform wireless communication with a smart phone or a tablet computer, so that the data of the frequency converter can be transmitted to the smart phone or the tablet computer, enabling remote control without manually operating the frequency converter panel at close range. This can not only improve the convenience of setting the parameters of the frequency converter, but also increase the work safety during the debugging process. Description of the Drawings

[0011] Figure 1 Schematic diagram of the Bluetooth module structure of the present utility model;

[0012] Figure 2 Schematic diagram of the wireless communication of the Bluetooth module;

[0013] Figure 3 Schematic circuit diagram of the Bluetooth chip and the IPEX antenna;

[0014] Figure 4 Schematic diagram of the Bluetooth module embedded in the frequency converter

[0015] Figure 5 Energy detection diagram when a traditional Bluetooth module is installed at the communication interface of the frequency converter;

[0016] Figure 6 Energy detection diagram when the improved Bluetooth module is installed at the communication interface of the frequency converter. Detailed Implementation Manner

[0017] See Figures 1 to 4 As shown, an Internet of Things wireless monitoring device for a frequency converter includes a Bluetooth module embedded in the frequency converter. The Bluetooth module includes a PCB board 1, on which a Bluetooth chip 2, a single-chip microcomputer chip 3, and an IPEX antenna 4 are installed. The model of the Bluetooth chip is NRF52832, and the protocol uses SMP, the baud rate is 9600, the frequency band is 2.4G, with low power consumption and long distance.

[0018] The single-chip microcomputer chip 3 communicates with the Bluetooth chip 2 through the TXD pin and the RXD pin. The single-chip microcomputer chip 3 is connected to the single-chip microcomputer of the frequency converter through a UART standard serial interface to achieve two-way data communication with good compatibility. The IPEX antenna is used for wireless communication with a smart phone or a tablet computer.

[0019] The wireless operating frequency band of the NRF52832 Bluetooth chip is 2.4G, and the power intensity of the transmitted signal is about 10 db. If it is installed at the communication interface of the frequency converter, it can be found during the EMC electromagnetic compatibility test that there will be about 10 db of energy detectable at the 2.4G frequency point, as Figure 5As shown, the radiation interference requirements of EMC are particularly emphasized in the aviation and medical fields. If the prominent noise signals are not eliminated, plus the harmonics inherent in the frequency converter itself, the superimposed energy has approached the 40 dB value, which will affect the use of surrounding precision instruments and equipment.

[0020] In order to suppress the 10 dB noise energy generated in the 2.4G frequency band, improvements have been made to the Bluetooth module in this application. Without affecting the original operating conditions, it effectively suppresses half of the spike noise, and the final measured data is 5 dB, as Figure 6 shown. The specific operation is as follows: A metal shielding cover 5 with an elliptical opening of about 60° is set at 4 positions of the IPEX antenna; A surrounding shielding layer 6 is set around the periphery of the PCB board 1; It can effectively suppress and release the radiation interference generated in the free space, and effectively suppress the EMS interference of the frequency converter during operation on the Bluetooth communication module. And at the power connection, it is connected through an L magnetic ring and an X capacitor 7 to reduce the conducted interference provided by the frequency converter to the Bluetooth module.

[0021] For the material of the PCB board, a board with a dielectric constant DK of ε≤3.5 and a loss factor DF≤0.003 is selected, which is beneficial to the transmission efficiency of high-speed signals between boards and reduces signal loss and noise problems. In addition, the PCB board wiring layer uses a 6-layer board design, including 2 layers of power signals and 2 layers of ground source signals, which can effectively reduce the interference emitted by the frequency converter device itself to the Bluetooth module.

[0022] The Bluetooth module and the frequency converter control board can communicate through the serial communication interface UART, thus forming a communication channel between the mobile phone and the frequency converter control board to achieve remote control.

Claims

1. An Internet of Things wireless monitoring device for a frequency converter, characterized in that: It includes a Bluetooth module embedded in the inverter, the Bluetooth module includes a PCB board, a Bluetooth chip, a single-chip microcomputer chip, and an IPEX antenna are installed on the PCB board, the single-chip microcomputer chip communicates with the Bluetooth chip through a TXD pin and a RXD pin, the single-chip microcomputer chip is connected to the single-chip microcomputer of the inverter using a UART standard serial interface, and the IPEX antenna is used for wireless communication with a smartphone or a tablet computer.

2. The Internet of Things wireless monitoring device for a frequency converter according to claim 1, characterized in that: The Bluetooth chip model is nRF52832@Nordic.

3. The Internet of Things wireless monitoring device for a frequency converter according to claim 1, characterized in that: The IPEX antenna is provided with a metal shielding cover with an elliptical opening.

4. The Internet of Things wireless monitoring device for a frequency converter according to claim 1, characterized in that: A surrounding shielding layer is arranged on the periphery of the PCB board.

5. The Internet of Things wireless monitoring device for a frequency converter according to claim 1, characterized in that: The power connection of the PCB board is provided with an L magnetic ring and an X capacitor.

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