Intelligent electric meter for terminal temperature measurement and temperature measurement method

Abstract

The invention relates to the technical field of intelligent electric meter detection, in particular to an intelligent electric meter for terminal temperature measurement and a temperature measurement method, the real-time temperature of a bonding pad is detected through a temperature sensor, and after detection, a detection result is transmitted to a micro-control unit through an analog-to-digital converter; the micro-control unit can calculate the collected data to obtain the real-time temperature of the bonding pad, so that the real-time temperature of the terminal on the PCB can be indirectly obtained according to the real-time temperature of the bonding pad, and the temperature of the terminal can be collected in real time. The temperature measuring structure of the intelligent electric meter is simple in structure, low in cost, high in precision, convenient to maintain and easy for large-scale production, and solves the problems of high cost, complex structure, unfavorable industrial production and high cost caused by the fact that a temperature sensor needs to be arranged on the surface or inside a terminal seat in the existing terminal testing method of the intelligent electric meter. And the temperature sensor is not easy to replace under the condition that the temperature sensor is damaged.

Description

Technical Field

[0001] The present invention relates to the technical field of smart meter detection, and in particular to a smart meter for measuring terminal temperature and a temperature measurement method. Background Art

[0002] Terminal temperature is an important parameter of smart meters. By monitoring it, it can be determined whether the smart meter terminals have loose connections, aging, foreign body intrusion, etc., which is of great significance for ensuring the meter's measurement accuracy, improving the meter's life, and preventing fires. During the installation of existing meters, the meter terminals become loose due to human or other factors, causing the meters to burn. The precursor to the burning of the meter is the abnormal increase in the temperature of the meter terminals. Since the cost of today's meters is relatively high, the burning of the meter not only causes inconvenience to the user's daily electricity use, but also brings unnecessary economic losses to the property management department.

[0003] The prior art CN205038248U discloses an electric meter with a terminal temperature detection function. By setting a buzzer and a relay, when the temperature sensor detects that the temperature of the wiring terminals in the electric meter is too high due to looseness, the buzzer will promptly alarm and the power supply will be cut off through the relay, so as to remind the user to eliminate the fault in time and avoid unnecessary losses.

[0004] However, the terminal testing method of the above-mentioned smart meter requires setting a temperature sensor on the surface or inside of the terminal seat, which is costly and complex in structure, not conducive to industrial production, and is difficult to replace when the temperature sensor is damaged, and even requires the entire terminal to be replaced. Summary of the invention

[0005] The purpose of the present invention is to provide an intelligent electric meter for measuring terminal temperature and a temperature measurement method, which solves the technical problem that the existing terminal testing method of the intelligent electric meter needs to set a temperature sensor on the surface or inside the terminal seat, which is costly and complex in structure, is not conducive to industrial production, and is difficult to replace when the temperature sensor is damaged, and even requires the entire terminal to be replaced.

[0006] To achieve the above-mentioned purpose, in a first aspect, the present invention provides a smart meter for terminal temperature measurement, comprising a smart meter body, a PCB board is arranged inside the smart meter body, the PCB board has VCC and GND, a terminal seat is arranged at the front end of the PCB board, four terminals are arranged inside the terminal seat, a temperature sensor, a micro control unit and an analog-to-digital converter are arranged on the PCB board, power ends of the temperature sensor, the analog-to-digital converter and the micro control unit are electrically connected to the VCC on the PCB board, respectively, ground ends of the temperature sensor, the analog-to-digital converter and the micro control unit are electrically connected to the GND on the PCB board, an output end of the temperature sensor is electrically connected to an input end of the analog-to-digital converter, and an output end of the analog-to-digital converter is electrically connected to an input end of the micro control unit.

[0007] The analog-to-digital converter is an analog-to-digital converter integrated inside the microcontroller unit, or an independent analog-to-digital converter chip.

[0008] Wherein, the temperature sensor is an integrated temperature sensor chip or a thermistor.

[0009] Wherein, a copper conductor is provided under the PCB board, the copper conductor is welded to the PCB board via a pad, and the copper conductor is directly connected to the terminal.

[0010] The temperature sensor is located close to the pad so as to obtain a more accurate temperature of the pad.

[0011] There are four temperature sensors, all of which are arranged on the PCB board, and output ends of the four temperature sensors are electrically connected to the input end of the same analog-to-digital converter.

[0012] In a second aspect, the present invention further provides a temperature measurement method for a smart meter for measuring terminal temperature, comprising the following steps:

[0013] The temperature on the pad is collected by a temperature sensor, and the collected data is transmitted to the microcontroller unit through an analog-to-digital converter;

[0014] The microcontroller unit calculates the collected data to obtain the real-time temperature of the pad;

[0015] When the temperature of the pad is lower than a certain value, approximating the temperature of the terminal to the temperature of the pad;

[0016] When the temperature of the pad is higher than a certain value, the temperature of the terminal is approximated to be the temperature of the pad plus a constant temperature difference, and the constant temperature difference is determined through preliminary experiments.

[0017] The present invention discloses a smart meter for measuring terminal temperature and a temperature measurement method. The temperature sensor is used to detect the real-time temperature of the pad, and after the detection, the detection result is transmitted to the microcontroller through the analog-to-digital converter, so that the microcontroller can calculate the collected data to obtain the real-time temperature of the pad, thereby indirectly obtaining the real-time temperature of the terminal on the PCB board according to the real-time temperature of the pad, thereby realizing real-time collection of the temperature of the terminal. The temperature measurement structure of the smart meter is simple in structure, low in cost, high in precision, convenient in maintenance, and easy in large-scale production. It solves the technical problem that the existing terminal testing method of the smart meter needs to set a temperature sensor on the surface or inside of the terminal seat, which has high cost and complex structure, is not conducive to industrial production, and is not easy to replace when the temperature sensor is damaged, and even requires the terminal to be replaced as a whole. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0019] Figure 1 1 is a schematic diagram of the overall structure of a smart meter for measuring terminal temperature according to the first embodiment of the present invention.

[0020] Figure 2 It is a schematic diagram of the internal side structure of an intelligent electric meter for measuring terminal temperature according to the first embodiment of the present invention.

[0021] Figure 3 It is a flowchart of a temperature measurement method of a smart meter for measuring terminal temperature according to a second embodiment of the present invention.

[0022] In the figure: 101-smart meter body, 102-PCB board, 103-terminal seat, 104-terminal, 105-copper conductor, 106-soldering pad, 107-temperature sensor, 108-micro control unit, 109-analog-to-digital converter. DETAILED DESCRIPTION

[0023] Embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0024] First embodiment:

[0025] See also Figure 1 and Figure 2The present invention provides a terminal temperature measurement smart meter, including a smart meter body 101, a PCB board 102 is arranged inside the smart meter body 101, the PCB board 102 has VCC and GND, a terminal seat 103 is arranged at the front end of the PCB board 102, four terminals 104 are arranged inside the terminal seat 103, and a temperature sensor 107, a micro control unit 108 and an analog-to-digital converter 109 are arranged on the PCB board 102.

[0026] In this embodiment, the real-time temperature of the pad 106 is detected by the temperature sensor 107, and after the detection, the detection result is transmitted to the microcontroller unit 108 through the analog-to-digital converter 109, so that the microcontroller unit 108 can calculate the collected data to obtain the real-time temperature of the pad 106, so that the real-time temperature of the terminal 104 on the PCB board 102 can be indirectly obtained according to the real-time temperature of the pad 106, thereby realizing the temperature test of the terminal 104. The temperature measurement structure of the smart meter is simple in structure, low in cost, high in precision, convenient in maintenance, and easy in large-scale production. It solves the technical problem that the existing method for testing the terminal 104 of the smart meter needs to set the temperature sensor 107 on the surface or inside of the terminal seat 103, which has high cost and complex structure, is not conducive to industrial production, and is not easy to replace when the temperature sensor 107 is damaged, and even the terminal 104 needs to be replaced as a whole.

[0027] Among them, the power supply ends of the temperature sensor 107, the analog-to-digital converter 109 and the micro control unit 108 are respectively electrically connected to the VCC on the PCB board 102, the ground ends of the temperature sensor 107, the analog-to-digital converter 109 and the micro control unit 108 are respectively electrically connected to the GND on the PCB board 102, the output end of the temperature sensor 107 is electrically connected to the input end of the analog-to-digital converter 109, and the output end of the analog-to-digital converter 109 is electrically connected to the input end of the micro control unit 108.

[0028] Secondly, the analog-to-digital converter 109 is an analog-to-digital converter 109 integrated inside the microcontroller unit 108, or an independent analog-to-digital converter 109 chip, and the temperature sensor 107 is an integrated temperature sensor 107 chip or a thermistor.

[0029] Next, a copper conductor 105 is provided below the PCB board 102 . The copper conductor 105 is soldered to the PCB board 102 via a soldering pad 106 , and the copper conductor 105 is directly connected to the terminal 104 .

[0030] Meanwhile, the number of the copper conductors 105 and the number of the soldering pads 106 are both four, the four copper conductors 105 are respectively soldered to the PCB board 102 via one soldering pad 106 , and the four copper conductors 105 are respectively directly connected to one terminal 104 .

[0031] In addition, the temperature sensor 107 is located close to the pad 106 to obtain a more accurate temperature of the pad 106. There are four temperature sensors 107. The four temperature sensors 107 are all arranged on the PCB board 102, and the output ends of the four temperature sensors 107 are all electrically connected to the input end of the same analog-to-digital converter 109.

[0032] Finally, the four temperature sensors 107 are directly soldered on the PCB board 102 , and thermal conductive glue is filled between the temperature sensors 107 and the soldering pads 106 to improve the heat conduction efficiency of the temperature sensors 107 .

[0033] When using a smart meter for terminal temperature measurement according to the present embodiment, the PCB board 102 is provided in the smart meter body 101, the PCB board 102 has the VCC and the GND, the terminal seat 103 is provided at the front end of the PCB board 102, four terminals 104 are provided inside the terminal seat 103, four copper conductors 105 are provided below the PCB board 102, four soldering pads 106 are provided on the PCB board 102, the four copper conductors 105 are respectively soldered to the PCB board 102 via one of the soldering pads 106, the four copper conductors 105 are respectively directly connected to one of the terminals 104, the PCB board 102 is provided with four temperature sensors 107, the four temperature sensors 107 are directly soldered to the PCB board 102, A thermal conductive adhesive is filled between the temperature sensor 107 and the pad 106 to improve the heat conduction efficiency of the temperature sensor 107. The microcontroller unit 108 and the analog-to-digital converter 109 are provided on the PCB board 102. The signal output end of the temperature sensor 107 is electrically connected to the signal input end of the analog-to-digital converter 109, and the signal output end of the analog-to-digital converter 109 is electrically connected to the signal input end of the microcontroller unit 108. The power supply end of the temperature sensor 107, the power supply end of the analog-to-digital converter 109 and the power supply end of the microcontroller unit 108 are electrically connected to the VCC respectively, and the ground end of the temperature sensor 107, the ground end of the analog-to-digital converter 109 and the ground end of the microcontroller unit 108 are electrically connected to the GND respectively, thereby completing the connection of the entire smart meter.

[0034] In this structure, the rest of the parts except the temperature sensor 107 are the inherent structures of the smart meter. The PCB board 102 is used to realize the circuit function, the terminal 104 is used to connect the external power line, the terminal seat 103 is used to protect the terminal 104, and the copper conductor 105 is directly connected to the terminal 104 and is welded to the PCB board 102 through the pad 106, which is used for the conduction between the terminal 104 and the terminal 104, and between the terminal 104 and the PCB board 102. In order to realize the temperature measurement function of the terminal 104, it is necessary to add the temperature sensor 107 and its related circuits beside the pad 106. Since the copper conductor 105 used for conduction also has excellent thermal conductivity, the heat on the terminal 104 will be quickly transferred to the pad 106 through the copper conductor 105, and the temperature on the pad 106 can be collected by the temperature sensor 107. Therefore, the temperature of the terminal 104 can be obtained by collecting the temperature on the pad 106 and calculating it. Through experiments, it is found that the relationship between the temperature of the terminal 104 and the temperature of the soldering pad 106 is that when the temperature of the terminal 104 is higher than a certain value, as the temperature of the terminal 104 changes, the temperature difference between the temperature of the terminal 104 and the temperature of the soldering pad 106 remains approximately constant, and when the temperature of the terminal 104 is lower than a certain temperature, the temperature of the terminal 104 and the temperature of the soldering pad 106 are approximately equal.

[0035] Therefore, after the connection, the real-time temperature of the pad 106 is detected by the temperature sensor 107, and after the detection, the detection result is transmitted to the microcontroller unit 108 through the analog-to-digital converter 109, so that the microcontroller unit 108 can calculate the collected data to obtain the real-time temperature of the pad 106, so that the real-time temperature of the terminal 104 on the PCB board 102 can be indirectly obtained according to the real-time temperature of the pad 106, thereby realizing the real-time collection of the temperature of the terminal 104. The temperature measurement structure of the smart meter is simple in structure, low in cost, high in precision, easy to maintain, and easy to mass produce. It solves the technical problem that the existing terminal 104 testing method of the smart meter needs to set the temperature sensor 107 on the surface or inside of the terminal seat 103, which has high cost and complex structure, is not conducive to industrial production, and is not easy to replace when the temperature sensor 107 is damaged, and even the terminal 104 needs to be replaced as a whole.

[0036] Second embodiment:

[0037] Based on the first embodiment, please refer to Figure 3 The present invention also provides a temperature measurement method for a smart meter for measuring terminal temperature, comprising the following steps:

[0038] S101 , collecting the temperature on the pad 106 through the temperature sensor 107 , and transmitting the collected data to the micro control unit 108 through the analog-to-digital converter 109 .

[0039] Specifically, the real-time temperature of the pad 106 is detected by the temperature sensor 107, and after the detection, the detection result is transmitted to the analog-to-digital converter 109, and the analog signal of the collected detection result is converted into a digital signal by the analog-to-digital converter 109, and after the conversion, the digital signal is transmitted to the micro control unit 108.

[0040] S102 , the micro control unit 108 calculates the collected data to obtain the real-time temperature of the pad 106 .

[0041] Specifically, the micro control unit 108 analyzes and calculates the received digital signal, thereby obtaining the real-time temperature of the pad 106 .

[0042] S103 , when the temperature of the pad 106 is lower than a certain value, approximate the temperature of the terminal 104 to the temperature of the pad 106 .

[0043] Specifically, when the temperature of the pad 106 is lower than a certain value, since the temperature of the terminal 104 is substantially equal to the temperature of the pad 106 , the temperature of the terminal 104 can be approximated to the temperature of the pad 106 .

[0044] S104 . When the temperature of the pad 106 is higher than a certain value, the temperature of the terminal 104 is approximated to the temperature of the pad 106 plus a constant temperature difference, and the constant temperature difference is determined through previous experiments.

[0045] Specifically, when the temperature of the soldering pad 106 is higher than a certain value, as the temperature of the terminal 104 changes, the temperature difference between the temperature of the terminal 104 and the temperature of the soldering pad 106 remains approximately constant, so that the temperature of the terminal 104 can be approximated as the temperature of the soldering pad 106 plus a constant temperature difference, and the constant temperature difference is determined through preliminary experiments.

[0046] What is disclosed above is only one or more preferred embodiments of the present application, and cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of implementing the above embodiments and equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A smart meter for measuring terminal temperature, comprising a smart meter body, characterized in that: A PCB board is provided inside the smart meter body, and the PCB board has VCC and GND. A terminal block is provided at the front end of the PCB board, and four terminals are provided inside the terminal block. A temperature sensor, a micro control unit and an analog-to-digital converter are provided on the PCB board. The power supply ends of the temperature sensor, the analog-to-digital converter and the micro control unit are electrically connected to the VCC on the PCB board, respectively. The ground ends of the temperature sensor, the analog-to-digital converter and the micro control unit are electrically connected to the GND on the PCB board, respectively. The output end of the temperature sensor is electrically connected to the input end of the analog-to-digital converter, and the output end of the analog-to-digital converter is electrically connected to the input end of the micro control unit.

2. The smart electric meter for measuring terminal temperature as claimed in claim 1, characterized in that: The analog-to-digital converter is an analog-to-digital converter integrated inside the microcontroller unit, or an independent analog-to-digital converter chip.

3. The smart electric meter for measuring terminal temperature as claimed in claim 1, characterized in that: The temperature sensor is an integrated temperature sensor chip or a thermistor.

4. The smart electric meter for measuring terminal temperature as claimed in claim 1, characterized in that: A copper conductor is arranged under the PCB board, the copper conductor is welded to the PCB board via a pad, and the copper conductor is directly connected to the terminal.

5. The smart electric meter for measuring terminal temperature as claimed in claim 4, characterized in that: The temperature sensor is located close to the pad so as to obtain a more accurate temperature of the pad.

6. The smart electric meter for measuring terminal temperature as claimed in claim 5, characterized in that: The number of the temperature sensors is four, and the four temperature sensors are all arranged on the PCB board, and the output ends of the four temperature sensors are all electrically connected to the input end of the same analog-to-digital converter.

7. A temperature measurement method for a smart meter for measuring terminal temperature, applied to the smart meter for measuring terminal temperature as claimed in any one of claims 1 to 6, characterized in that: The following steps are involved: The temperature on the pad is collected by a temperature sensor, and the collected data is transmitted to the microcontroller unit through an analog-to-digital converter; The microcontroller unit calculates the collected data to obtain the real-time temperature of the pad; When the temperature of the pad is lower than a certain value, approximating the temperature of the terminal to the temperature of the pad; When the temperature of the pad is higher than a certain value, the temperature of the terminal is approximated to be the temperature of the pad plus a constant temperature difference, and the constant temperature difference is determined through preliminary experiments.

Images