Sunken direct current metering module based on TMR sensing technology

Abstract

The utility model is suitable for the technical field of current sensing and metering, and relates to a sinking type direct current metering module based on a TMR sensing technology, which comprises an MCU management unit, a measuring chip unit, a current sampling circuit, a voltage sampling circuit, an addressing sampling circuit, a pulse output module and a communication interaction module. The MCU management unit is respectively connected with the measuring chip unit, the pulse output module, the communication interaction module and the addressing sampling circuit, the current sampling circuit and the voltage sampling circuit are respectively connected with the measuring chip unit, and the current sampling circuit is also connected with the TMR sensor. The direct-current metering module is simple in structure and convenient to work, and the metering precision and the anti-interference capability of the direct-current metering module are effectively improved.

Description

Technical Field

[0001] This utility model belongs to the field of current sensing and metering technology, and particularly relates to a sunken DC metering module based on TMR sensing technology. Background Technology

[0002] To promote and leverage the integrated benefits of resource sharing and ensure the efficient operation of base stations, China Tower Corporation Limited provides detailed data on energy-saving improvements for the three major telecom operators. To achieve energy conservation and emission reduction in the communications industry, it has proposed a static multi-loop DC energy metering solution. Existing multi-loop DC energy meters mostly employ an MCU + multiple sensors approach. Voltage and current are input via external terminals, and current is measured by analog voltage signals input through Hall effect sensors, fluxgate sensors, or manganese-copper shunts. If the main control MCU module malfunctions, all metering channels will fail. Hall effect sensors suffer from drawbacks such as low sensitivity, significant temperature drift, sensitivity to magnetic field amplitude and direction, and limited measurement distance; external magnetic fields may also affect their measurements. Fluxgate sensors are complex in structure, expensive, and susceptible to external magnetic fields and temperature, requiring regular calibration to ensure accuracy. Manganese-copper sensors, on the other hand, have disadvantages such as low piezoresistive coefficient, short lifespan, inconvenient installation, easy oxidation, large temperature coefficient of resistance, and potential safety hazards during use.

[0003] Patent application CN118330284A discloses a smart DC power metering module for a tower base station based on a Hall sensor. The module includes a housing and a power distribution unit. The housing has an internal cavity, and a fixed partition is fixedly connected to the inner wall of the cavity. The fixed partition has a dustproof grid inside. A switching structure, including a switching motor, is fixedly mounted on the fixed partition. The output end of the switching motor is fixedly connected to a coaxial switching shaft via a coupling. This patent application's metering module uses a Hall sensor for measurement, which has low accuracy and suffers from the same drawbacks as existing technologies.

[0004] Therefore, how to provide a metrology module with high detection accuracy and strong anti-interference capability is a problem that urgently needs to be solved by those in this technical field. Utility Model Content

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a recessed DC metering module based on TMR sensing technology, thereby solving the problems of low detection accuracy and weak anti-interference capability of existing metering modules.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] This utility model provides a recessed DC metering module based on TMR sensing technology, comprising:

[0008] MCU management unit, measurement chip unit, current sampling circuit, voltage sampling circuit, addressing sampling circuit, pulse output module, communication interaction module;

[0009] The MCU management unit is connected to the measurement chip unit, pulse output module, communication interaction module, and addressing sampling circuit respectively. The current sampling circuit and the voltage sampling circuit are connected to the measurement chip unit respectively. The current sampling circuit is also connected to the TMR sensor.

[0010] Furthermore, the voltage sampling circuit includes resistors RA10, RT1, RT2, and RT3, capacitors C45 and C20. One end of resistor RA10 is connected to the voltage signal U1. The other end of resistor RA10 is connected to one end of resistor RT1 and one end of resistor RT2, respectively. The other end of resistor RT1 is connected to one end of resistor RT3. The other end of resistor RT2 is connected to one end of capacitor C45. The other end of resistor RT3 is connected to one end of capacitor C20. The other end of capacitor C45 is connected to the other end of capacitor C20.

[0011] Furthermore, the current sampling circuit includes resistors RB1, RB2, RB3, RB4, RB6, RB7, capacitors CB1 and CB2. One end of resistor RB1 is connected to one end of resistor RB3 and one end of resistor RB6, respectively. The other end of resistor RB3 is connected to one end of capacitor CB1. One end of resistor RB2 is connected to one end of resistor RB4 and one end of resistor RB7, respectively. The other end of resistor RB4 is connected to one end of capacitor CB2. The other end of capacitor CB1 is connected to the other end of capacitor CB2.

[0012] Furthermore, the addressing sampling circuit includes resistors R12 and R2 and capacitor C10. One end of resistor R12 is connected to one end of resistor R2 and one end of capacitor C10, respectively, and the other end of resistor R2 is connected to the other end of capacitor C10.

[0013] Furthermore, the model of the MCU management unit is V8510P.

[0014] Furthermore, the measurement chip of the measurement chip unit is RN8209.

[0015] Furthermore, the communication interaction module supports RS485 communication, uses optical isolation, and has communication rates of 2400bps, 4800bps, and 9600bps.

[0016] Compared with the prior art, the sunken DC metering module based on TMR sensing technology provided by this utility model has at least the following advantages:

[0017] Existing multi-loop DC energy meters mostly employ an MCU + multiple sensors approach. Voltage and current are input via external terminals, and current is measured by analog voltage signals input through Hall effect sensors, fluxgate sensors, or manganese-copper shunts. If the main control MCU module malfunctions, all metering circuits will fail. Hall effect sensors suffer from drawbacks such as low sensitivity, significant temperature drift, sensitivity to magnetic field amplitude and direction, and limited measurement distance; external magnetic fields may also affect their measurements. Fluxgate sensors are complex in structure, expensive, and susceptible to external magnetic fields and temperature, requiring regular calibration to ensure measurement accuracy. Manganese-copper sensors, on the other hand, have disadvantages such as low piezoresistive coefficient, short lifespan, inconvenient installation, easy oxidation, large temperature coefficient of resistance, and potential safety hazards during use. This invention features a simple structure and convenient operation. The metering circuit is integrated into the TMR sensor, enabling precise independent measurement of energy, voltage, and current for each module. By incorporating signal conditioning, analog-to-digital conversion, and data processing functions into each TMR sensor module, each channel can operate independently and read module information via a concentrator, significantly reducing the need for simultaneous processing of multiple data streams by the main control system. It overcomes the limitations of Hall effect sensors, fluxgate sensors, and manganese-copper shunts by employing a TMR sensor solution. TMR sensors offer advantages such as high sensitivity, high linearity, and low power consumption, accurately detecting weak magnetic fields while exhibiting good temperature stability and anti-interference capabilities, making them suitable for applications in complex electromagnetic environments. They also feature rapid response, a wide measurement range, and a compact size, making them easy to integrate. The entire invention effectively ensures the detection accuracy of the metering module and provides strong anti-interference capabilities. Attached Figure Description

[0018] To more clearly illustrate the solution of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 A structural block diagram of a recessed DC metering module based on TMR sensing technology provided in an embodiment of this utility model;

[0020] Figure 2A voltage sampling circuit diagram of a recessed DC metering module based on TMR sensing technology provided for an embodiment of this utility model;

[0021] Figure 3 A current sampling circuit diagram of a sunken DC metering module based on TMR sensing technology provided for an embodiment of this utility model;

[0022] Figure 4 The position signal of the sunken DC metering module based on TMR sensing technology provided in this embodiment of the utility model is illustrated in the circuit diagram. Detailed Implementation

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. For example, terms such as “length,” “width,” “upper,” “lower,” “left,” “right,” “front,” “rear,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer” indicate orientations or positions based on the orientations or positions shown in the accompanying drawings and are merely for ease of description and should not be construed as limiting the invention.

[0024] The terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this utility model are intended to cover non-exclusive inclusion; the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish different objects, not to describe a particular order. In the specification, claims, and accompanying drawings of this utility model, when an element is referred to as "fixed to," "mounted to," "set on," or "connected to" another element, it can be directly or indirectly located on that other element. For example, when an element is referred to as "connected to" another element, it can be directly or indirectly connected to that other element.

[0025] Furthermore, the reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the present invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0026] This utility model provides a recessed DC metering module based on TMR sensing technology, which is applied to scenarios involving the measurement of electrical energy, current, voltage, or other physical quantities. The recessed DC metering module based on TMR sensing technology includes:

[0027] The system includes an MCU management unit, a measurement chip unit, a current sampling circuit, a voltage sampling circuit, an addressing sampling circuit, a pulse output module, and a communication interaction module. The MCU management unit is connected to the measurement chip unit, the pulse output module, the communication interaction module, and the addressing sampling circuit, respectively. The current sampling circuit and the voltage sampling circuit are connected to the measurement chip unit, and the current sampling circuit is also connected to the TMR sensor.

[0028] This invention has a simple structure and is easy to operate, effectively improving the metering accuracy and anti-interference capability of the DC metering module.

[0029] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0030] This invention provides a recessed DC metering module based on TMR sensing technology, applicable to scenarios involving the measurement of electrical energy, current, voltage, or other physical quantities. Figures 1 to 4 In this embodiment, the sunken DC metering module based on TMR sensing technology includes:

[0031] The system comprises an MCU management unit, a measurement chip unit, a current sampling circuit, a voltage sampling circuit, an addressable sampling circuit, a pulse output module, and a communication module. The MCU management unit is connected to the measurement chip unit, the pulse output module, the communication module, and the addressable sampling circuit. The current and voltage sampling circuits are connected to the measurement chip unit, and the current sampling circuit is also connected to a TMR sensor. The MCU management unit uses a V8510P chip, and the measurement chip unit includes one RN8209 measurement chip, which communicates with the MCU management unit via UART and directly outputs active pulses. The system reads measurement chip data in real time, which is then controlled, accumulated, processed, saved, and output in the MCU management unit. The current sampling circuit uses a resistor voltage divider, and the data enters the current sampling channel of the measurement chip through a resistor-capacitor filter network. The voltage sampling circuit uses a resistor voltage divider, and the data enters the voltage sampling channel of the measurement chip through a resistor-capacitor filter network. The addressing sampling circuit uses a resistor voltage divider to input the analog quantity to the MCU's acquisition pin. The communication interaction circuit supports RS485, and the communication baud rate supports 2400bps, 4800bps, and 9600bps. The communication protocol supports the DL / T645-2007 standard.

[0032] Furthermore, in this embodiment, the voltage sampling circuit includes resistors RA10, RT1, RT2, and RT3, capacitors C45 and C20. One end of resistor RA10 is connected to the voltage signal U1. The other end of resistor RA10 is connected to one end of resistor RT1 and one end of resistor RT2, respectively. The other end of resistor RT1 is connected to one end of resistor RT3. The other end of resistor RT2 is connected to one end of capacitor C45. The other end of resistor RT3 is connected to one end of capacitor C20. The other end of capacitor C45 is connected to the other end of capacitor C20. The voltage sampling circuit uses a voltage divider circuit composed of a 100k resistor RT10. After sampling by a 1kΩ follow-up resistor RT1, it enters the voltage sampling channel of the measurement chip through the subsequent RC filter. Through the resistor voltage divider network, the voltage signal entering the measurement chip is UI*RT1 / (RA10+RT1). The voltage specification is 48V. After the sampling circuit, the sampling voltage entering the measurement chip is 475mV, which is within the 1000mV required by the measurement chip. Considering the 60V margin, the voltage signal value is 594mV, which is within the measurement range of the measurement chip.

[0033] Furthermore, in this embodiment, the current sampling circuit includes resistors RB1, RB2, RB3, RB4, RB6, RB7, capacitors CB1 and CB2. One end of resistor RB1 is connected to one end of resistor RB3 and one end of resistor RB6, respectively. The other end of resistor RB3 is connected to one end of capacitor CB1. One end of resistor RB2 is connected to one end of resistor RB4 and one end of resistor RB7, respectively. The other end of resistor RB4 is connected to one end of capacitor CB2. The other end of capacitor CB1 is connected to the other end of capacitor CB2. The TMR sensor outputs a differential signal V0 of 2.5±2V. The subsequent stage uses resistors RB1 and RB7. B2, resistors RB6 and RB7, and the RC filter circuit process the signal. The voltage signal entering the measurement chip is (V0+Vref)*RB1 / (RB1+RB6)-Vref*RB2 / (RB2+RB7), where resistors RB1 and RB2 are equal, and resistors RB6 and RB7 are equal. Therefore, the input chip voltage signal is V0*RB1 / (RB1+RB6). When the current is at full scale, the 2V is sampled by the sampling circuit to obtain a sampling voltage of 327mV entering the measurement chip. This is within the 1000mV requirement of the measurement chip, and considering the 2.4V margin, the voltage signal value is 393mV, which is within the measurement range of the measurement chip.

[0034] Furthermore, in this embodiment, the addressing sampling circuit includes resistors R12 and R2 and capacitor C10. One end of resistor R12 is connected to one end of resistor R2 and one end of capacitor C10 respectively, and the other end of resistor R2 is connected to the other end of capacitor C10. The input signal of the addressing sampling circuit is DC 0~5V. It is divided by resistors R12 and R2. The signal input to the MCU management unit is: VI*R2 / (R2+R12). Based on the signal magnitude at different locations, the MCU management unit automatically allocates the module address according to the sampled voltage signal magnitude.

[0035] The recessed DC metering module based on TMR sensing technology described in the above embodiments differs from existing technologies. Existing multi-loop DC energy meters typically employ an MCU + multiple sensors, with voltage and current input via external terminals. Current is achieved by inputting an analog voltage signal through a Hall sensor, fluxgate sensor, or manganese-copper shunt. If the main control MCU module malfunctions, all metering circuits will fail. Hall sensors suffer from drawbacks such as low sensitivity, significant temperature drift, sensitivity to magnetic field amplitude and direction, and limited measurement distance; external magnetic fields may also affect their measurements. Fluxgate sensors are complex in structure, expensive, and susceptible to external magnetic fields and temperature fluctuations, requiring periodic calibration to ensure accuracy. Manganese-copper sensors, on the other hand, have disadvantages including low piezoresistive coefficient, short lifespan, inconvenient installation, susceptibility to oxidation, a large temperature coefficient of resistance, and potential safety hazards during use. This invention features a simple structure and convenient operation. The metering circuit is integrated into the TMR sensor, enabling precise independent measurement of energy, voltage, and current for each module. By incorporating signal conditioning, analog-to-digital conversion, and data processing functions into each TMR sensor module, each channel can operate independently and read module information via a concentrator, significantly reducing the need for simultaneous processing of multiple data streams by the main control system. It overcomes the limitations of Hall effect sensors, fluxgate sensors, and manganese-copper shunts by employing a TMR sensor solution. TMR sensors offer advantages such as high sensitivity, high linearity, and low power consumption, accurately detecting weak magnetic fields while exhibiting good temperature stability and anti-interference capabilities, making them suitable for applications in complex electromagnetic environments. They also feature rapid response, a wide measurement range, and a compact size, making them easy to integrate. The entire invention effectively ensures the detection accuracy of the metering module and provides strong anti-interference capabilities.

[0036] Obviously, the embodiments described above are merely preferred embodiments of this utility model, and not all embodiments. The accompanying drawings show preferred embodiments of this utility model, but do not limit the patent scope of this utility model. This utility model can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this utility model specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this utility model.

Claims

1. A recessed DC metering module based on TMR sensing technology, characterized in that, include: MCU management unit, measurement chip unit, current sampling circuit, voltage sampling circuit, addressing sampling circuit, pulse output module, communication interaction module; The MCU management unit is connected to the measurement chip unit, pulse output module, communication interaction module, and addressing sampling circuit respectively. The current sampling circuit and the voltage sampling circuit are connected to the measurement chip unit respectively. The current sampling circuit is also connected to the TMR sensor.

2. The recessed DC metering module based on TMR sensing technology according to claim 1, characterized in that, The voltage sampling circuit includes resistors RA10, RT1, RT2, and RT3, capacitors C45 and C20. One end of resistor RA10 is connected to the voltage signal U1. The other end of resistor RA10 is connected to one end of resistor RT1 and one end of resistor RT2, respectively. The other end of resistor RT1 is connected to one end of resistor RT3. The other end of resistor RT2 is connected to one end of capacitor C45. The other end of resistor RT3 is connected to one end of capacitor C20. The other end of capacitor C45 is connected to the other end of capacitor C20.

3. The recessed DC metering module based on TMR sensing technology according to claim 1, characterized in that, The current sampling circuit includes resistors RB1, RB2, RB3, RB4, RB6, and RB7, and capacitors CB1 and CB2. One end of resistor RB1 is connected to one end of resistor RB3 and one end of resistor RB6, and the other end of resistor RB3 is connected to one end of capacitor CB1. One end of resistor RB2 is connected to one end of resistor RB4 and one end of resistor RB7, and the other end of resistor RB4 is connected to one end of capacitor CB2. The other end of capacitor CB1 is connected to the other end of capacitor CB2.

4. A recessed DC metering module based on TMR sensing technology according to claim 1, characterized in that, The addressing sampling circuit includes resistor R12, resistor R2 and capacitor C10. One end of resistor R12 is connected to one end of resistor R2 and one end of capacitor C10 respectively, and the other end of resistor R2 is connected to the other end of capacitor C10.

5. A recessed DC metering module based on TMR sensing technology according to claim 1, characterized in that, The MCU management unit is model V8510P.

6. A recessed DC metering module based on TMR sensing technology according to claim 1, characterized in that, The measurement chip in the measurement chip unit is RN8209.

7. A recessed DC metering module based on TMR sensing technology according to claim 1, characterized in that, The communication interaction module supports RS485 communication, uses optical isolation, and has communication rates of 2400bps, 4800bps, and 9600bps.

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