5G-RRU power management equipment based on RS485 communication

Abstract

The utility model provides a 5G-RRU power supply management device based on RS485 communication, comprising an MCU module, and an ADC module, an indicating lamp module and an RS485 communication module which are connected with the MCU module, each module is connected with a power supply module, a voltage acquisition module and a current acquisition module are arranged between the power supply module and the ADC module, and the RS485 communication module is connected with the voltage acquisition module and the current acquisition module. The voltage acquisition module and the current acquisition module both adopt a differential circuit, a magnetic bead and a filter capacitor are configured between the differential circuit and the power supply module, and the differential circuit is connected with the ADC module through an RC filter circuit; the RS485 communication module is connected with the MCU module through an RS485 bus, and the RS485 bus is connected with a filter network and a magnetic bead in series. According to the utility model, the problem of poor anti-interference capability of the voltage and current acquisition circuit in the 5G-RRU power supply module is solved, and the stability of the whole structure is enhanced.

Description

Technical Field

[0001] This utility model relates to the field of communication technology, specifically a 5G-RRU power management device based on RS485 communication. Background Technology

[0002] 5G-RRU operates in a complex electromagnetic environment, surrounded by various strong electromagnetic field sources, such as radio frequency signals and other communication equipment. These electromagnetic interferences can enter the current and voltage acquisition circuit through electromagnetic coupling and other means, affecting the quality of the acquired signal, the reliability of the acquisition, and reducing the performance of the entire power management system. Utility Model Content

[0003] To address the problems of existing technologies, this invention provides a 5G-RRU power management device based on RS485 communication, which solves the problem of poor anti-interference capability of voltage and current acquisition circuits in 5G-RRU power modules and enhances the stability of the overall structure.

[0004] This utility model provides a 5G-RRU power management device based on RS485 communication, including an MCU module, an ADC module connected to the MCU module, an indicator light module, and an RS485 communication module. Each module is connected to a power module. A voltage acquisition module and a current acquisition module are provided between the power module and the ADC module. Both the voltage acquisition module and the current acquisition module adopt differential circuits. A ferrite bead and a filter capacitor are configured between the differential circuit and the power module. The differential circuit and the ADC module are connected through an RC filter circuit. The RS485 communication module is connected to the MCU module through an RS485 bus. A filter network and a ferrite bead are connected in series on the RS485 bus.

[0005] Further improvements include the use of LDO linear regulators in the power module, with its input connected to an external power supply and its output connected to the power pins of each module.

[0006] As a further improvement, the RS485 communication module is equipped with an isolated conversion chip, and a filter network is configured at the power input pin of the conversion chip.

[0007] In a further improvement, the filter network is composed of a 47μF electrolytic capacitor and a 0.1μF ceramic capacitor.

[0008] As a further improvement, a TVS diode is added between the RS485 bus and ground.

[0009] In a further improvement, the current acquisition module uses high-precision resistors, capacitors, and operational amplifiers with high common-mode rejection ratio and low noise to perform differential operations. After the operational amplifier, an RC filter circuit is connected to the ADC module for analog-to-digital conversion.

[0010] In a further improvement, the voltage acquisition module is equipped with a voltage divider resistor network, which is connected to high-precision components and a high-performance operational amplifier for differential operation, and then connected to an ADC module for analog-to-digital conversion through an RC filter circuit.

[0011] The beneficial effects of this utility model are: it solves the problem of poor anti-interference capability of voltage and current acquisition circuit in 5G-RRU power module, and enhances the stability of the overall structure. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is the circuit diagram for the power module;

[0014] Figure 2 This is the circuit diagram of the voltage and current acquisition module;

[0015] Figure 3 This is the circuit diagram of the ADC module;

[0016] Figure 4 This is a circuit diagram of an isolated RS485 communication module.

[0017] Figure 5 This is a schematic diagram of the combined structure of each module. Detailed Implementation

[0018] 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 scope of protection of the present utility model.

[0019] This invention is based on improvements to existing power management devices, without making any changes to the existing modules themselves. Existing 5G-RRU power management devices based on RS485 communication, such as... Figure 5 As shown, it includes an MCU module, an ADC module connected to the MCU module, an indicator light module, and an RS485 communication module. Each module is connected to the power supply module.

[0020] This power management device focuses on optimizing the voltage and current acquisition modules in its circuit design. At the front end of the power input acquisition circuit, ferrite beads and filter capacitors are used to effectively suppress high-frequency interference signals. Differential acquisition is employed for both current and voltage, significantly suppressing common-mode interference and effectively suppressing differential-mode interference. During sampling, high-precision resistors and capacitors, along with an operational amplifier with high common-mode rejection ratio and low noise, complete the differential operation. Subsequent RC circuits filter out high-order harmonic interference and random pulse interference, enhancing anti-interference performance through multiple measures. Furthermore, a linear power supply is used for the ADC module, and decoupling capacitors are placed near its power pins. Utilizing the low impedance characteristics of these decoupling capacitors for high-frequency signals, high-frequency interference signals are guided to ground, reducing their propagation on the power lines. At the PCB layout level, the length of critical signal traces is streamlined, ensuring equal length for differential lines and avoiding potential interference sources from a layout perspective. Simultaneously, analog ground and digital ground are separated, and a single-point parallel grounding strategy is adopted to further enhance noise immunity.

[0021] The MCU module analyzes and processes the data acquired by the ADC module, and then transmits the processed data to the host computer using an RS485 level conversion chip. In the RS485 level conversion circuit, an isolated conversion chip with excellent common-mode rejection performance is selected, effectively isolating the communication circuit from other circuits, preventing interference signals from entering, and reducing the impact of common-mode noise. A filter network consisting of a 47μF electrolytic capacitor and a 0.1μF ceramic capacitor is configured at the power input pin of the conversion chip to suppress power supply noise interference. A ferrite bead is connected in series on the RS485 bus. At high frequencies, the ferrite bead acts as a resistor, converting high-frequency energy into heat energy, thereby enhancing the anti-interference level of the RS485 bus. Simultaneously, a TVS diode is added between the RS485 bus and ground. When the amplitude of the electrical fast pulse group interference voltage coupled to the RS485 bus is too high, the interference voltage can be clamped by the TVS diode, ensuring the safe operation of the RS485 transceiver.

[0022] This device possesses excellent anti-interference performance, primarily due to the following optimized design aspects:

[0023] Power supply front end: The synergistic effect of the ferrite bead and the filter capacitor can effectively suppress high-frequency interference signals.

[0024] Differential acquisition: Using differential acquisition method, combined with high-precision components and operational amplifiers, it accurately acquires current and voltage data, effectively suppressing common-mode and differential-mode interference.

[0025] RC filter circuit: can filter out high-order harmonic interference and random pulse interference, further improving anti-interference capability.

[0026] PCB layout: Carefully plan the routing and grounding strategies to isolate interference sources from the root.

[0027] RS485 communication section: The isolation conversion chip blocks interference signals, and together with the filter network, ferrite beads and TVS tubes, it protects the communication line in all aspects, ensuring stable and reliable data transmission even in complex electromagnetic environments.

[0028] These anti-interference measures complement each other, ensuring that the circuit can maintain signal purity and stability when facing complex interference sources, thereby guaranteeing the reliable operation of the entire system.

[0029] One specific implementation of each module of this utility model is as follows:

[0030] Power module implementation methods, such as Figure 1 As shown:

[0031] An LDO linear regulator is used, with its input connected to an external power supply and its output connected to the power pins of each module. The input and output capacitors are set according to the chip requirements to stabilize the voltage output.

[0032] The implementation method of the current acquisition module is as follows: Figure 2 As shown:

[0033] Differential operation is performed using high-precision resistors, capacitors, and an operational amplifier with high common-mode rejection ratio and low noise to amplify the useful signal and suppress common-mode interference. An RC filter circuit is then connected after the operational amplifier, and finally, the processed current signal is sent to the ADC module for analog-to-digital conversion.

[0034] Implementation methods of voltage acquisition module, such as Figure 2 As shown:

[0035] For input and output voltage acquisition, a voltage divider network is used at the corresponding power input and output ports to convert the high-voltage signal into a low-voltage signal suitable for ADC acquisition. Differential acquisition is also employed, utilizing high-precision components and a high-performance operational amplifier for differential operation to reduce the impact of common-mode and differential-mode interference. After filtering and other processing, the voltage signal is input to the ADC module for subsequent digital processing and analysis, enabling real-time monitoring and acquisition of the input and output voltages.

[0036] ADC module implementation methods, such as Figure 3 As shown:

[0037] Select an analog-to-digital converter (ADC) chip with suitable resolution and sampling frequency, and connect it to the MCU module via an I2C interface. Write the corresponding driver program according to the chip's communication protocol to enable the MCU to control the ADC module and read data. In terms of hardware connections, pay attention to decoupling the power supply pins. Use a linear power supply and place appropriate decoupling capacitors, such as 0.1μF ceramic capacitors, near the power supply pins. Utilize the low impedance characteristics of the decoupling capacitors for high-frequency signals to guide high-frequency interference signals to ground, reducing interference propagation on the power lines and ensuring that the ADC module can accurately perform analog-to-digital conversion, providing the MCU with reliable digital signals for data analysis and processing.

[0038] RS485 communication module implementation method, such as Figure 4 As shown:

[0039] Select a suitable RS485 transceiver chip and connect it to the serial port pin of the MCU module to achieve TTL level to RS485 level conversion. Design the circuit according to the chip requirements, including the connection of power supply pins and matching of drive capability. For physical layer communication data framing and transmission, set parameters such as data bits, stop bits, and parity bits according to the RS485 communication protocol to ensure accurate data transmission on the communication line. Simultaneously, protect the communication line, such as using shielded twisted-pair cable, to improve the anti-interference capability of the communication.

[0040] Regarding interference immunity optimization in circuit design:

[0041] At the power input of the acquisition circuit, ferrite beads and filter capacitors are installed to effectively suppress high-frequency interference signals. The selection of ferrite beads should be based on the actual operating frequency and current requirements, and the capacitance and voltage rating of the filter capacitors should also be reasonably selected to achieve a better filtering effect. For the RC filter circuit, appropriate R and C values ​​should be determined according to the frequency characteristics of the signal to effectively filter out interference signals such as high-order harmonics and random pulses, thereby improving the anti-interference performance of the entire acquisition circuit. In terms of PCB layout, the length of key signal traces should be simplified, and differential lines should be kept to equal length to reduce signal transmission delay and mutual interference. Analog ground and digital ground should be separated, and a single-point parallel grounding strategy should be adopted. A reasonable ground line layout should be designed on the PCB to avoid mutual interference between the ground lines of digital and analog signals, further enhancing the noise immunity of the entire circuit.

[0042] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on its differences from other embodiments. In particular, for the device embodiments, the above descriptions are merely preferred embodiments of this utility model. Since they are fundamentally similar to the method embodiments, the descriptions are relatively simple; relevant parts can be referred to the descriptions of the method embodiments. The above descriptions are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this utility model, without departing from the principle of this utility model, should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A 5G-RRU power management device based on RS485 communication, comprising an MCU module, an ADC module connected to the MCU module, an indicator light module, and an RS485 communication module, each module being connected to a power module, characterized in that: A voltage acquisition module and a current acquisition module are provided between the power supply module and the ADC module. Both the voltage acquisition module and the current acquisition module adopt differential circuits. A ferrite bead and a filter capacitor are configured between the differential circuit and the power supply module. The differential circuit and the ADC module are connected through an RC filter circuit. The RS485 communication module and the MCU module are connected through an RS485 bus. A filter network and a ferrite bead are connected in series on the RS485 bus.

2. The 5G-RRU power management device based on RS485 communication according to claim 1, characterized in that: The power module uses an LDO linear regulator, with its input connected to an external power supply and its output connected to the power pins of each module.

3. The 5G-RRU power management device based on RS485 communication according to claim 1, characterized in that: The RS485 communication module is equipped with an isolated conversion chip, and a filter network is configured at the power input pin of the conversion chip.

4. The 5G-RRU power management device based on RS485 communication according to claim 3, characterized in that: The filter network consists of a 47μF electrolytic capacitor and a 0.1μF ceramic capacitor.

5. The 5G-RRU power management device based on RS485 communication according to claim 1, characterized in that: A TVS diode is added between the RS485 bus and ground.

6. The 5G-RRU power management device based on RS485 communication according to claim 1, characterized in that: The current acquisition module uses high-precision resistors, capacitors, and operational amplifiers with high common-mode rejection ratio and low noise to perform differential operations. After the operational amplifier, it is connected to the ADC module through an RC filter circuit for analog-to-digital conversion.

7. The 5G-RRU power management device based on RS485 communication according to claim 1, characterized in that: The voltage acquisition module is equipped with a voltage divider resistor network, which is connected to high-precision components and a high-performance operational amplifier for differential operation, and then connected to an ADC module for analog-to-digital conversion through an RC filter circuit.

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