CT energy taking type LoRa temperature measurement module applied to cable

Abstract

The invention discloses a CT energy taking type LoRa temperature measurement module applied to a cable. The module adopts a CT power taking mode, and the obtained energy is stored in the energy storage element and the energy storage element 2 after being subjected to rectification and voltage stabilization processing. Wherein the energy storage element is responsible for providing required electric energy for the NTC temperature measurement module, the single-chip microcomputer and the energy storage element 2 to ensure normal operation of the NTC temperature measurement module, the single-chip microcomputer and the energy storage element 2; and the energy storage element 2 is specially used for independently supplying power to the LoRa module, so that the power demand of the LoRa module in the working process is met, the whole temperature measurement module can stably and reliably operate, and accurate measurement of the cable temperature and effective transmission of data are realized.

Description

Technical Field

[0001] The present invention relates to a CT energy-taking type LoRa temperature measurement module applied to a cable. Background Art

[0002] The operating status of the cable is related to the reliability and stability of the power system. Because it generates heat when current passes through, if the heat is not dissipated in time, it will cause the temperature to be too high, which will lead to accidents such as insulation aging, short circuit and even fire, so it is very important to monitor the cable temperature in real time and accurately. The current commonly used traditional wired temperature measurement method has poor layout flexibility. Battery-powered wireless temperature measurement equipment needs to be replaced regularly due to limited battery life, and it is inconvenient to operate in difficult-to-maintain places. In view of this, the combination of CT power supply technology and LoRa wireless communication technology in the field of cable temperature measurement has broad prospects and great significance. It can solve the shortcomings of existing temperature measurement methods and meet the needs of the power industry to ensure the safe operation of equipment.

[0003] For example, the Chinese invention patent with the authorization announcement number CN 104075816 A discloses an electric field induction power-taking type wireless temperature measurement system, in which the induction plate current is used for the wireless temperature measurement terminal, and the terminal uploads the data to the receiver. A specific method is described in the radio frequency communication flow chart of Figure 5 of the patent, that is, whether the host computer receives a reply is used as the basis for judging the voltage. However, the CT energy-taking type LoRa temperature measurement module applied to the cable proposed in this patent proposes a design method in terms of circuit and working mode. The LORA module is equipped with a separate energy storage element 2 for power supply, and the voltage of the LoRa module is monitored by a single-chip microcomputer. At the same time, the single-chip microcomputer is also responsible for calculating the charging time and power of the energy storage element 2, and by controlling the closed state of the MOS, the charging of the energy storage element 2 is accurately controlled until the voltage of the energy storage element 2 can meet the working voltage requirements of the LoRa module. Compared with the prior art, the present invention provides a stable and reliable power supply and precise energy management for the LoRa module, and provides a new solution for the performance improvement and function realization of the cable temperature measurement module. Summary of the invention

[0004] The purpose of the present invention is to provide a CT energy-taking LoRa temperature measurement module for cables in order to solve the above problems. By combining CT power taking technology with LoRa wireless communication technology, real-time and accurate monitoring of cable temperature and effective transmission of data can be achieved, while ensuring stable operation of the equipment under different working conditions and reasonable management of energy.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions: Module composition: A CT energy-taking LoRa temperature measurement module applied to cables, including a rectifier module, a voltage stabilizing module, an energy storage element, an energy storage element 2, an NTC temperature measurement module, a single-chip circuit part and a LoRa module.

[0006] Rectification module: uses bridge rectifier circuit and introduces capacitor to reduce the pulsation component of output voltage and output stable voltage. Voltage regulator module: uses linear regulator to output 3.3V voltage stably.

[0007] Energy storage element and energy storage element 2: In order to adapt to the normal operation when the primary loop current is relatively small, the circuit part needs to achieve an ultra-low power consumption working state. A relatively small voltage stabilizing filter capacitor is selected as the pre-stage capacitor to meet the requirements that the capacitor can store sufficient power and meet the power supply rising speed.

[0008] The energy storage element is responsible for providing power to the NTC temperature measurement module, the single-chip microcomputer and the energy storage element 2, and the energy storage element 2 is used to supply power to the LoRa module separately.

[0009] Working process: 2.1 After power-on, the energy storage element starts to charge. At this time, the MOS controlling the energy storage element 2 is in the disconnected state, and the energy storage element 2 is not charged.

[0010] 2.2 Judge the voltage of the energy storage element. If it does not reach 3.3V, it will enter the sleep mode and wait for charging. After reaching 3.3V, the microcontroller starts working.

[0011] 2.3 The work of the MCU includes the following three parts: 2.3 (1) After the data is sent, the MCU monitors the voltage of the LoRa module and calculates the charging time and power of the energy storage element 2. It controls the charging of the energy storage element 2 by controlling the closed state of the MOS until its voltage reaches the operating voltage requirement of the LoRa module.

[0012] 2.3 (2) After the MCU issues the command for the LoRa module to enter ultra-low power consumption, the MOS is directly closed and the energy storage element 2 starts to charge. During the charging process, the MCU continuously monitors the voltage of the LoRa module, calculates the charging time and power of the energy storage element 2, and the LoRa module is in working state after charging is completed.

[0013] 2.3 (3) When the microcontroller monitors the temperature, it compares it with the set temperature value. When the set temperature value is reached, it is ready to send data; if the set temperature value is not reached, it continues to monitor the temperature.

[0014] 2.3 (4) Data transmission has the following two conditions: First, when the LoRa module is in working state and the temperature reaches the set value, the temperature data is sent directly; second, the LoRa module sends temperature data every 3 minutes. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a working flow chart of the CT energy-taking type LoRa temperature measurement module applied to cables according to the present invention; Figure 2 It is a circuit block diagram of the CT energy-taking type LoRa temperature measurement module applied to cables according to the present invention; Figure 3 It is a diagram of the energy storage element and the charging voltage of the energy storage element 2 when the CT energy-taking type LoRa temperature measurement module applied to the cable of the present invention is powered on; Figure 4 It is a voltage diagram of the energy storage element 2 before and after communication of the CT energy-taking LoRa temperature measurement module applied to the cable according to the present invention. DETAILED DESCRIPTION

[0016] The present invention will be further described below in conjunction with the accompanying drawings: Figure 1 As shown: This figure is a working flow chart of the CT energy-taking LoRa temperature measurement module applied to cables according to the present invention, and the steps are as follows: After power-on, the energy storage element starts to charge. At this time, the MOS controlling the energy storage element 2 is in the disconnected state, and the energy storage element 2 is not charged.

[0017] The voltage of the energy storage element is judged. If it does not reach 3.3V, it enters sleep mode and waits for charging. After reaching 3.3V, the microcontroller starts working.

[0018] The work of the MCU includes the following three parts: After the data is sent, the MCU monitors the voltage of the LoRa module, calculates the charging time and power of the energy storage element 2, and controls the charging of the energy storage element 2 by controlling the closed state of the MOS until its voltage reaches the working voltage requirement of the LoRa module.

[0019] After the MCU issues the command for the LoRa module to enter ultra-low power consumption, the MOS is directly closed and the energy storage element 2 starts to charge. During the charging process, the MCU continuously monitors the voltage of the LoRa module, calculates the charging time and power of the energy storage element 2, and the LoRa module is in a working state after charging is completed. After charging is completed, the LoRa module is in a working state, and the MCU is ready to send data at a fixed time (that is, the maximum value of the charging time calculated by the MCU). When the microcontroller monitors the temperature, it compares it with the set temperature value. When the set temperature value is reached, it is ready to send data; if the set temperature value is not reached, it continues to monitor the temperature.

[0020] There are two conditions for data transmission: first, when the LoRa module is in working state and the temperature reaches the set value, the temperature data is sent directly; second, the LoRa module sends temperature data every 3 minutes.

[0021] like Figure 2 As shown: This figure is a circuit block diagram of the CT energy-taking LoRa temperature measurement module applied to cables according to the present invention, including: (1) Rectifier module: A bridge rectifier circuit is used, and filter capacitors, bidirectional TVS and Zener diodes are introduced to reduce the pulsation component of the output voltage and output a stable voltage.

[0022] (2) Voltage regulator module: Use a linear regulator to stabilize the output voltage of 3.3V.

[0023] (3) Energy storage element and energy storage element 2: In order to adapt to normal operation when the primary circuit current is relatively small, the circuit part needs to achieve an ultra-low power consumption working state. A relatively small voltage stabilizing filter capacitor is selected as the pre-stage capacitor to meet the requirements that the capacitor can store sufficient power and meet the power supply rising speed.

[0024] (4) The energy storage element is responsible for providing power to the NTC temperature measurement module, the microcontroller and the energy storage element 2. The energy storage element 2 provides power for the LoRa module alone.

[0025] like Figure 3 , 4 As shown, Figure 3 The energy storage element of the CT energy-taking type LoRa temperature measurement module applied to the cable of the present invention and the charging voltage of the energy storage element 2; Figure 4 This is the voltage diagram of the energy storage element 2 before and after communication of the CT energy-taking LoRa temperature measurement module applied to the cable according to the present invention.

[0026] (1) Charging voltage of energy storage element and energy storage element 2: After a series of processes such as rectification, voltage stabilization and filtering, the energy storage element and energy storage element 2 use multiple voltage stabilization and filtering capacitors with smaller capacitance values ​​(220uF, 47uF) to store energy. Figure 3, 3 seconds after power-on, the energy storage element can reach a stable voltage of 3.3V. After the MOS is turned on, the energy storage element 2 is quickly charged and can reach a stable voltage of 3.3V after 3 seconds. Multiple tests have confirmed that the selection of multiple capacitors with small capacitance values ​​can better match the power supply rise speed and effective energy storage, which means that when the circuit is started or the power supply state changes, the energy storage element can respond faster and stabilize the output voltage, providing a reliable power supply foundation for the stable operation of the entire temperature measurement module.

[0027] (2) If Figure 4 When the LoRa module communicates, a large voltage drop often occurs. The energy storage element 2 is quickly charged to replenish the energy loss, ensuring that the LoRa module has sufficient voltage support in the next communication or working state, thereby ensuring the stable operation and data transmission function of the LoRa module.

[0028] This design scheme fully considers the energy demand and voltage characteristics of the CT energy-taking LoRa temperature measurement module under different working conditions, realizes the optimized management of the energy storage element and the energy storage element 2, and improves the performance and reliability of the entire temperature measurement module.

[0029] All technical solutions within the scope of the present invention are within the protection scope of the present invention. Improvements and modifications made by ordinary technicians in this technical field without departing from the principle of the present invention are also within the protection scope of the present invention.

Claims

1. A CT energy-taking LoRa temperature measurement module applied to cables, characterized in that: It includes rectifier module, voltage regulator module, energy storage element, energy storage element 2, NTC temperature measurement module, microcontroller circuit and LoRa module. Rectifier module: based on bridge rectifier circuit, introduces capacitors to reduce the pulsation component of output voltage, and then outputs a stable voltage; voltage regulator module: uses linear voltage regulator to output 3.3V voltage stably; "energy storage element" and "energy storage element 2": in order to adapt to the normal operation when the primary loop current is relatively small, it is necessary to achieve ultra-low power consumption in the circuit part. In order to meet the requirements that the capacitor can store sufficient electricity and meet the power supply rising speed, a relatively small voltage stabilizing filter capacitor is selected as the pre-stage capacitor; the NTC temperature measurement module and the microcontroller circuit are powered by the energy storage element; The LoRa module is powered by energy storage element 2 alone, thus ensuring that the module operates normally at ultra-low power consumption.

2. The working process of a CT energy-taking LoRa temperature measurement module applied to a cable according to claim 1, characterized in that: The following steps are involved: (1) After power-on, the energy storage element starts to charge, and at the same time, the MOS that controls the energy storage element 2 is in the disconnected state. At this time, the energy storage element 2 is not charged; (2) Determine whether the voltage of the energy storage element has reached 3.3V. If it has not reached 3.3V, the microcontroller enters sleep mode and continues to wait for the energy storage element to charge. Once it reaches 3.3V, the microcontroller starts working. (3) The operation of a single chip microcomputer consists of three parts: Part 1: The MCU monitors the voltage of the LoRa module, calculates the charging time and power of the energy storage element 2, and controls the charging of the energy storage element 2 by controlling the closed state of the MOS until the voltage of the energy storage element 2 reaches the working voltage requirement of the LoRa module; Part 2: After the MCU issues the command for the LoRa module to enter ultra-low power consumption, the MOS is directly closed, and the energy storage element 2 starts to charge. During the charging process, the MCU continuously monitors the voltage of the LoRa module, calculates the charging time and power of the energy storage element 2, and after charging is completed, the LoRa module is in a working state; Part 3: When the MCU monitors the temperature, it compares it with the set temperature value. When the set temperature value is reached, it is ready to send data. If the set temperature value is not reached, it continues to monitor the temperature. There are two conditions for data transmission: first, when the LoRa module is in working state and the temperature reaches the set value, the temperature data is sent directly; second, the LoRa module sends temperature data every 3 minutes.

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