A remote monitoring system and Internet of Things solid-state relay

Abstract

A remote monitoring system and an Internet of Things solid-state relay, the Internet of Things solid-state relay includes a control circuit, a photoelectric isolation circuit, a solid-state switch circuit, an NB-IOT module, a current detection circuit, and a temperature detection circuit; the control circuit is connected to an input control terminal, the control circuit includes a power supply circuit and a drive conduction circuit, the drive conduction circuit turns on or off the solid-state switch circuit through the photoelectric isolation circuit, so that the load circuit of the relay is turned on or off; the NB-IOT module includes an MCU circuit, the MCU circuit is connected to the drive conduction circuit, the current detection circuit, and the temperature detection circuit, and the MCU circuit is used to process and upload temperature and current signals to a cloud server. The cloud server of the remote monitoring system is used to receive the current and temperature information uploaded by the Internet of Things solid-state relay, and the cloud server sends a control signal to the Internet of Things solid-state relay to turn on or off the load circuit.

Description

Technical Field

[0001] The present invention relates to the field of switches, and in particular to a remote monitoring system and an Internet of Things solid-state relay. Background Art

[0002] Solid-state relays are contactless switches composed of discrete electronic devices and power electronic devices. Isolation devices are used to isolate the control end from the load end. A small control signal can be used to directly drive a large current load at the input end. The normal working temperature of solid-state relays cannot exceed 80°C. If the temperature is too high, the solid-state current capacity will be greatly reduced, which is easy to cause damage.

[0003] Although the existing solid-state relay is equipped with a status indicator light, which is formed by a light-emitting diode connected in series to the input end of the photocoupler, and can directly reflect the working status of the solid-state relay, it cannot truly reflect the state of the solid-state switch tube under abnormal conditions, especially when the output circuit of the solid-state relay fails, and the existing solid-state relay is not equipped with a device to monitor the temperature and the current flowing through the solid-state switch, which is not conducive to ensuring the normal use of the solid-state relay. In addition, the existing solid-state relay does not have the technical means of network management and does not meet the needs of the development of the Internet of Things. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a remote monitoring system and an Internet of Things solid-state relay capable of monitoring temperature and current.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] An Internet of Things solid-state relay, comprising a control circuit, a photoelectric isolation circuit, a solid-state switch circuit, an NB-IOT module, a current detection circuit and a temperature detection circuit;

[0007] The control circuit is connected to the input control terminal, and the control circuit includes a power supply circuit and a drive conduction circuit. The power supply circuit is used to supply power to the NB-IOT module, the current detection circuit, and the temperature detection circuit. The drive conduction circuit turns on or off the solid-state switch circuit through the photoelectric isolation circuit to turn on or off the load circuit of the relay;

[0008] The NB-IOT module is used to connect to the cloud server. The NB-IOT module includes an MCU circuit. The MCU circuit is connected to the drive conduction circuit, the current detection circuit and the temperature detection circuit. The current detection circuit is connected in series between the solid-state switch circuit and the load circuit to detect the current signal flowing through the solid-state switch circuit. The temperature detection circuit is used to detect the internal temperature of the solid-state relay. The MCU circuit is used to process and upload the temperature and current signals to the cloud server.

[0009] Preferably, the photoelectric isolation circuit includes a photocoupler IC3, and a connection signal is input at the input control end, and the control circuit generates a current signal and a voltage signal, the current signal is used to drive the photocoupler IC3 to turn on and then turn on the solid-state switch circuit, and the voltage signal is used to power the NB-IOT module, the current detection circuit and the temperature detection circuit; if the connection signal is not received at the input end, the NB-IOT module, the current detection circuit and the temperature detection circuit do not work.

[0010] Preferably, the NB-IOT module also includes a transparent transmission module, which is used to transmit the signal processed by the MCU circuit to the cloud server.

[0011] Preferably, the MCU circuit also includes a protection circuit, which is controlled by a cloud server and connected to a drive conduction circuit. When a connection signal is input to the input control terminal, the NB-IOT module can receive a disconnection control signal from the cloud server, and the drive conduction circuit is disconnected through the protection circuit to disconnect the load circuit of the relay.

[0012] Preferably, the MCU circuit includes a chip IC1, which has multiple I / O ports for transmitting signals, and the signal output end of the current detection circuit, the signal output end of the temperature detection circuit and the signal output end of the protection circuit are respectively connected to the three I / O ports; the protection circuit includes a resistor R10, a light-emitting diode D4 and a transistor Q5, one end of the resistor R10 is connected to the I / O port of IC1, the other end of the resistor R10 is connected to the base of the transistor Q5, the cathode of the light-emitting diode D4 is connected to the collector of the transistor Q5, and the emitter of the transistor Q5 and the anode of the light-emitting diode D4 are respectively connected to the drive conduction circuit.

[0013] Preferably, the temperature detection circuit includes a temperature sensor IC2, and a signal output pin DQ of the temperature sensor IC2 is connected to the MCU circuit of the NB-IOT module; the signal output pin DQ of the temperature sensor IC2 is connected to the power supply circuit through a resistor R5.

[0014] Preferably, the current detection circuit includes a current sampling chip IC4, a capacitor C3 and a capacitor C4, the current signal output terminal VIOUT of the current sampling chip IC4 is connected to the MCU circuit of the NB-IOT module, one end of the capacitor C3 is connected to the current signal output terminal VIOUT of the current sampling chip IC4, one end of the capacitor C4 and the power supply terminal VCC of the current sampling chip IC4 are connected to the power supply circuit of the control circuit, and the other ends of the capacitor C3 and the capacitor C4 and the ground terminal GND of the current sampling chip IC4 are connected to GND.

[0015] Preferably, the control circuit is connected to two input control terminals, and the control circuit includes a resistor R3, a resistor R4, a capacitor C2, a capacitor C5, a transistor Q2, a light-emitting diode D3 and a diode D2. One end of the resistor R3 is connected to one input control terminal, and the other end of the resistor R3 is respectively connected to the resistor R4 and the collector of the transistor Q2. The emitter of the transistor Q2 is used to power the MCU circuit, the temperature detection circuit and the current detection circuit. The other end of the resistor R4 is connected to the positive electrode of the capacitor C5, one end of the capacitor C2 and the positive electrode of the light-emitting diode D3 are connected to the base of the transistor Q2, the cathode of the light-emitting diode D3 and the positive electrode of the diode D2 are respectively connected to the two input terminals of the photoelectric isolation circuit, and the negative electrode of the capacitor C5, the other end of the capacitor C2 and the cathode of the diode D2 are connected to another input control terminal and to GND.

[0016] Preferably, the photoelectric isolation circuit includes a photoelectric coupler IC3, a resistor R6, a resistor R7, a resistor R8, a transistor Q3, a thyristor Q4 and a rectifier bridge D1;

[0017] The fourth pin of the photocoupler IC3 is connected to one end of the resistor R6, the other end of the resistor R6 and one end of the resistor R7 are connected to the base of the transistor Q3, the other end of the resistor R7, one end of the resistor R8 and the anode of the thyristor Q4 are connected to the positive output end of the rectifier bridge D1, the third pin of the photocoupler IC3, the emitter of the transistor Q3 and the cathode of the thyristor Q4 are connected to the negative output end of the rectifier bridge D1, the gate of the thyristor Q4 and the other end of the resistor R8 are connected to the collector of the transistor Q3, and the two input ends of the rectifier bridge D1 are respectively connected to the two ends of the solid-state switch circuit.

[0018] Preferably, the solid-state switching circuit includes a bidirectional thyristor Q1, a capacitor C1, a resistor R1, a resistor R2 and a resistor R9, the main electrode T1 of the bidirectional thyristor is connected to the current output end of the current detection circuit, the gate G of the bidirectional thyristor and one end of the resistor R1 are connected to one end of the photoelectric isolation circuit, one end of the resistor R9 is connected to the other end of the photoelectric isolation circuit, the other end of the resistor R9 is connected to the current input end of the current detection circuit, the main electrode T2 of the bidirectional thyristor Q1 and the other end of the resistor R1 are connected to one end of the resistor R2, the other end of the resistor R2 is connected to one end of the capacitor C1, and the other end of the capacitor C1 is connected to the other end of the resistor R9.

[0019] Preferably, the solid-state switch circuit includes an electronic power device, and the electronic power device is an IGBT power tube, a MOSFET power tube, an NPN power tube, or a thyristor.

[0020] A remote monitoring system includes a cloud server for receiving status information uploaded by an IoT solid-state relay as described above, wherein the IoT solid-state relay is connected in a load circuit for controlling the power supply of the load device, and the status information includes current and temperature information. The cloud server can send a control signal to the IoT solid-state relay to turn on or off the load circuit.

[0021] Furthermore, when the cloud server monitors that the current information uploaded by the IoT solid-state relay is greater than the current threshold, or less than the current threshold, or the cloud server monitors that the temperature information uploaded by the IoT solid-state relay is greater than the temperature threshold, or less than the temperature threshold, an early warning message is issued and / or the IoT solid-state relay is disconnected.

[0022] Furthermore, the cloud server groups multiple networked IoT solid-state relays, and sets current thresholds and temperature thresholds for each group of IoT solid-state relays. When it is monitored that the current information uploaded by a certain IoT solid-state relay is greater than the current threshold of the corresponding group, or less than the current threshold of the corresponding group, or when it is monitored that the temperature information uploaded by a certain IoT solid-state relay is greater than the temperature threshold of the corresponding group, or less than the temperature threshold of the corresponding group, an early warning message is issued and / or the IoT solid-state relay is disconnected.

[0023] Furthermore, the cloud server groups multiple networked IoT solid-state relays, analyzes the collected current and temperature data of the IoT solid-state relays in the same group and makes a mathematical model. When it is monitored that the temperature and current information of the IoT solid-state relays in the group obviously exceeds the corresponding threshold of the mathematical model, an early warning message is issued and / or the IoT solid-state relays are disconnected.

[0024] Furthermore, the cloud server makes a mathematical model of the fitting curve based on the temperature and current information collected by the IoT solid-state relays in the same group, fits the temperature and / or current information as variables to obtain the fitting curve, and obtains the maximum threshold curve and / or the minimum threshold curve based on the fitting curve. When the cloud server monitors that the temperature and / or current variables of a certain IoT solid-state relay in the group are outside the maximum threshold curve and the minimum threshold curve, an early warning message is issued and / or the IoT solid-state relay is disconnected.

[0025] Furthermore, the cloud server records the original state parameters of the IoT solid-state relay and the original parameters of the load device connected to the load circuit, and the cloud server calculates the electrical life of the IoT solid-state relay and / or the load device through the state information uploaded by the IoT solid-state relay.

[0026] Furthermore, the load circuit is a sewage valve circuit, and the status information uploaded by the IoT solid-state relay to the cloud server includes a current signal, and the current signal is used to feedback the opening and closing status of the IoT solid-state relay and the opening and closing status of the sewage valve circuit; and or, the cloud server records the number of times the sewage valve circuit is opened based on the acquired current signal, which is used to calculate the life of the sewage valve.

[0027] Furthermore, the load circuit is a petroleum equipment circuit, and the status information uploaded by the IoT solid-state relay to the cloud server includes a current signal and a temperature signal. The current signal is used to feedback the on / off status of the IoT solid-state relay and the on / off status of the petroleum equipment circuit, and the temperature signal is used to feedback the temperature of the IoT solid-state relay and the temperature of the oil well equipment.

[0028] An IoT solid-state relay of the present invention, on the basis of realizing the function of directly driving a large current load through a tiny control signal, adds an NB-IOT module, a current detection circuit and a temperature detection circuit that can be connected to form a complete signal path, can monitor and upload the temperature inside the solid-state relay and the current flowing through the solid-state switch circuit, monitor the real state of the solid-state switch tube, and help ensure the normal use of the solid-state relay.

[0029] In addition, a transparent transmission module is also provided in the NB-IOT module, which can be connected to the cloud server to monitor the temperature of the solid-state relay and the current flowing through the solid-state switch circuit through the cloud server.

[0030] In addition, a protection circuit is added to the MCU circuit. The protection circuit is controlled by the cloud server and controls the on and off of the driving conduction circuit after receiving the control signal of the cloud server, and is not affected by the signal of the input control end.

[0031] A remote monitoring system of the present invention is based on signal transmission among an Internet of Things solid-state relay, a cloud server and an operation platform, so that the Internet of Things solid-state relay controls a load circuit under the control of the cloud server to realize remote control. At the same time, the Internet of Things solid-state relay uploads status information to the cloud server, so that the operation platform can obtain the working status of the Internet of Things solid-state relay and the load circuit in time, thereby realizing remote monitoring. The system is particularly suitable for monitoring polluting fields such as chemical industry and light industry, as well as workplaces such as furnaces and oil wells that are not convenient for real-time monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a circuit diagram of an Internet of Things solid-state relay of the present invention;

[0033] Figure 2 is a schematic diagram of a remote monitoring system of the present invention;

[0034] Figure 3It is a circuit diagram of an existing solid-state relay, including a control circuit, a photoelectric isolation circuit and a solid-state switch circuit. DETAILED DESCRIPTION

[0035] The following is combined with Figure 1-3 The given embodiments further illustrate the specific implementation of a remote monitoring system and an Internet of Things solid-state relay thereof of the present invention. A remote monitoring system and an Internet of Things solid-state relay thereof of the present invention are not limited to the description of the following embodiments.

[0036] An Internet of Things solid-state relay comprises a control circuit, a photoelectric isolation circuit, a solid-state switch circuit, an NB-IOT module, a current detection circuit and a temperature detection circuit; the control circuit is connected to an external input control terminal, the control circuit comprises a power supply circuit and a drive conduction circuit, the power supply circuit is used to supply power to the NB-IOT module, the current detection circuit and the temperature detection circuit, the drive conduction circuit turns on or off the solid-state switch circuit through the photoelectric isolation circuit, so that the load circuit of the relay is turned on or off; the NB-IOT module is used to be connected to a cloud server, the NB-IOT module comprises an MCU circuit, the MCU circuit is connected to the drive conduction circuit, the current detection circuit and the temperature detection circuit, the current detection circuit is connected in series between the solid-state switch circuit and the load circuit for monitoring a current signal flowing through the solid-state switch circuit, the temperature detection circuit is used to monitor the internal temperature of the solid-state relay, and the MCU circuit is used to process and upload the temperature and current signals to the cloud server.

[0037] An IoT solid-state relay of the present invention, on the basis of realizing the function of directly driving a large current load through a tiny control signal, adds an NB-IOT module, a current detection circuit and a temperature detection circuit that can be connected to form a complete signal path, can monitor the temperature inside the solid-state relay and the current flowing through the solid-state switch circuit, which is beneficial to ensure the normal use of the solid-state relay.

[0038] Preferably, the IoT solid-state relay further includes a protection circuit, the MCU circuit of the NB-IOT module is connected to the protection circuit, the protection circuit is connected to the drive conduction circuit, the protection circuit can be controlled by the cloud server, when the input control terminal inputs the connection signal, the NB-IOT module can receive the disconnection or conduction control signal from the cloud server, and the drive conduction circuit is disconnected or conducted through the protection circuit to disconnect or conduct the load circuit of the relay. For example, when the cloud server determines that the temperature or current of the relay is abnormal according to the signal uploaded by the NB-IOT module, when the MCU circuit receives the control signal for executing protection transmitted by the cloud server, the relay is disconnected through the protection circuit.

[0039] Combination Figure 1An embodiment of an Internet of Things solid-state relay is provided, comprising a control circuit, a photoelectric isolation circuit, a solid-state switch circuit, an NB-IOT module, a current detection circuit, and a temperature detection circuit;

[0040] The control circuit is connected to the external input control terminal. The control circuit includes a power supply circuit and a drive conduction circuit. The power supply circuit is used to supply power to the NB-IOT module, the current detection circuit, and the temperature detection circuit. The drive conduction circuit switches on or off the solid-state switch circuit through the photoelectric isolation circuit to switch on the load circuit of the relay. The photoelectric isolation circuit includes a photocoupler IC3. A connection signal is input at the input control terminal. The connection signal is usually a 3-32V DC voltage signal. The control circuit generates a current signal and a voltage signal. The current signal is used to drive the photocoupler IC3 to switch on. The voltage signal is used to supply power to the NB-IOT module, the current detection circuit, and the temperature detection circuit. When the input terminal does not receive the connection signal and the 3-32V DC voltage signal is not input, the NB-IOT module, the current detection circuit, and the temperature detection circuit do not work, thereby greatly reducing power consumption.

[0041] The NB-IOT module is connected to the cloud server. The NB-IOT module includes an MCU circuit and a transparent transmission module. The transparent transmission module is integrated in the NB-IOT module. The MCU circuit is connected to the drive conduction circuit, the current detection circuit and the temperature detection circuit. The current detection circuit is connected in series between the solid-state switch circuit and the load circuit to detect the current signal flowing through the solid-state switch circuit. The temperature detection circuit is used to monitor the internal temperature of the solid-state relay. The MCU circuit controls the conduction or disconnection of the drive conduction circuit under the control of the cloud server. At the same time, the MCU circuit is also used to receive and process temperature and current signals. The transparent transmission module is used to transmit the signal processed by the MCU circuit to the cloud server. The temperature and the current flowing through the solid-state switch circuit are monitored by the cloud server, which solves the defect that the temperature and the current flowing through the solid-state switch circuit are not monitored in the prior art, and is suitable for the development and application of the Internet of Things.

[0042] The MCU circuit has multiple I / O ports for transmitting signals, specifically, the chip IC1 has multiple I / O ports, the power supply terminal VCC of the chip IC1 is connected to the power supply circuit, the signal output terminal of the current detection circuit is connected to an I / O port of the MCU circuit, and the signal output terminal of the temperature detection circuit is connected to another I / O port of the MCU circuit. In this embodiment, the chip IC1 model is WH-NB73-BA.

[0043] The temperature detection circuit includes a temperature sensor IC2. The temperature sensor IC2 adopts a high-precision dual-pin digital pulse output temperature sensor NST1001, which has the characteristics of pulse counting output and high precision in a wide temperature range. The signal output pin DQ of the temperature sensor IC2 is connected to the MCU circuit of the NB-IOT module, and has extremely low power consumption. At the same time, the signal output pin DQ is connected to the power supply circuit through a resistor R5.

[0044] The current detection circuit includes a current sampling chip IC4, a capacitor C3 and a capacitor C4, wherein the current sampling chip IC4 adopts a Hall current sampling chip ACS758, the current signal output terminal VIOUT of the current sampling chip IC4 is connected to the MCU circuit of the NB-IOT module, one end of the capacitor C3 is connected to the current signal output terminal VIOUT of the current sampling chip IC4, one end of the capacitor C4 and the power supply terminal VCC of the current sampling chip IC4 are connected to the power supply circuit of the control circuit, and the other ends of the capacitor C3 and the capacitor C4 and the ground terminal GND of the current sampling chip IC4 are connected to GND.

[0045] The MCU circuit also includes a protection circuit, which is connected to the drive conduction circuit. The protection circuit is connected to an I / O port in the MCU circuit and is controlled by the cloud server. After the NB-IOT module receives a disconnection or conduction control signal from the cloud server, the protection circuit disconnects or conducts the drive conduction circuit to disconnect or conduct the load circuit of the relay. At this time, the input control terminal maintains the input connection signal, and the MCU circuit prevents the drive conduction circuit from conducting the photoelectric coupler IC3 of the photoelectric isolation circuit through the protection circuit, so that the photoelectric coupler IC3 is turned off and the load circuit is turned off. The preferred MCU circuit includes a chip IC1 with multiple I / O ports.

[0046] The control circuit, photoelectric isolation circuit, solid-state switch circuit, NB-IOT module, current detection circuit, and temperature detection circuit are preferably solidified in a housing. Such a structure does not have a wiring port that can be manually connected to the IoT solid-state relay, avoiding manual operation, and compared with existing solid-state relays, it has the function of being remotely closed and opened. The IoT solid-state relay of the present application adopts IoT technology, has extremely low power consumption, and can work for several years or even longer with only one backup battery.

[0047] Specific connection relationship such as Figure 1As shown, the control circuit is connected to two input control terminals, and the control circuit includes a resistor R3, a resistor R4, a capacitor C2, a capacitor C5, a transistor Q2, a light emitting diode D3 and a diode D2. One end of the resistor R3 is connected to an input control terminal, and the other end of the resistor R3 is respectively connected to the resistor R4 and the collector of the transistor Q2. The emitter of the transistor Q2 is used to power the MCU circuit, the temperature detection circuit and the current detection circuit. The other end of the resistor R4 is connected to the positive electrode of the capacitor C5, one end of the capacitor C2 and the positive electrode of the light emitting diode D3 are connected to the base of the transistor Q2, the cathode of the light emitting diode D3 and the positive electrode of the diode D2 are respectively connected to the two input terminals of the photoelectric isolation circuit, that is, respectively connected to the two input pins of the photoelectric coupler IC3 of the photoelectric isolation circuit, and the negative electrode of the capacitor C5, the other end of the capacitor C2 and the cathode of the diode D2 are connected to the other input control terminal and connected to GND. Among them, the resistor R3 and the resistor R4 are current limiting resistors, the resistor R1 provides current limiting function for the transistor Q2 voltage stabilizing circuit, the resistor R4 provides voltage bias for the transistor Q2, and the capacitor C2 and the capacitor C5 are filter capacitors.

[0048] The driving conduction circuit in the control circuit includes a resistor R3, a resistor R4, a capacitor C2, a capacitor C5, a light-emitting diode D3 and a diode D2. The driving conduction circuit and the power supply circuit share the resistor R3, the resistor R4, the capacitor C2, the capacitor C5, the light-emitting diode D3 and the diode D2. The cathode of the light-emitting diode D3 and the anode of the diode D2 are respectively connected to the two input ends of the photoelectric isolation circuit, that is, respectively connected to the two input pins of the photoelectric coupler IC3 of the photoelectric isolation circuit, for turning on the photoelectric coupler IC3. The two input control ends input the connection electrical signal, the driving conduction circuit turns on the photoelectric coupler IC3 to turn on the solid-state switch circuit, and supplies power to the NB-IOT module, the current detection circuit, and the temperature detection circuit. When the two input control ends are not powered, the relay does not work.

[0049] The protection circuit for driving the conduction circuit in the drive control circuit includes a resistor R10, a light emitting diode D4 and a transistor Q5, one end of the resistor R10 is connected to the I / O port of the chip IC1 in the MCU circuit, the other end of the resistor R10 is connected to the base of the transistor Q5, the cathode of the light emitting diode D4 is connected to the collector of the transistor Q5, the emitter of the transistor Q5 and the anode of the light emitting diode D4 are respectively connected to the drive conduction circuit, specifically, the anode of the light emitting diode D4 is connected to the anode of the light emitting diode D3 in the control circuit, and the emitter of the transistor Q5 is connected to the second pin of the photoelectric coupler IC3 in the control circuit.

[0050] When the two input control terminals keep the input connected to the electrical signal state, when the cloud server determines that the temperature or current of the relay is abnormal according to the signal uploaded by the NB-IOT module, the MCU circuit receives the control signal for executing protection transmitted by the cloud server. At this time, the MCU circuit outputs a high-level signal to the protection circuit to drive the transistor Q5 to turn on. Since the transistor Q5 is saturated and turned on, the tube voltage drop between the collector and the emitter is less than the turn-on voltage of the photocoupler IC3, so the photocoupler IC3 is turned off, disconnecting the solid-state switch circuit, and the load circuit is turned off. The cloud server disconnects the relay through the protection circuit. Whether the photocoupler IC3 is turned on or the threshold point of turning on is controlled by the cloud server, and the cloud server realizes the protection function through the protection circuit.

[0051] At the same time, the cloud server can also realize the remote control function through the protection circuit. When the input end of the solid-state relay is powered and the power supply is maintained for a long time, even if the cloud server does not detect the fault, when the load needs to be turned off, the MCU circuit is controlled by the cloud server and sends a high-level signal. Through the protection circuit, the drive conduction circuit cannot turn on the photocoupler IC3, the photocoupler IC3 is turned off, and the load circuit is turned off; conversely, the MCU circuit is controlled by the cloud server and does not send a high-level signal. The drive conduction circuit turns on the photocoupler IC3, and the load circuit is turned on. At this time, the solid-state relay realizes the remote control function.

[0052] The photoelectric isolation circuit includes a photoelectric coupler IC3, a resistor R6, a resistor R7, a resistor R8, a transistor Q3, a thyristor Q4 and a rectifier bridge D1; the fourth pin of the photoelectric coupler IC3 is connected to one end of the resistor R6, the other end of the resistor R6 and one end of the resistor R7 are connected to the base of the transistor Q3, the other end of the resistor R7, one end of the resistor R8 and the anode of the thyristor Q4 are connected to the positive output end of the rectifier bridge D1, the third pin of the photoelectric coupler IC3, the emitter of the transistor Q3 and the cathode of the thyristor Q4 are connected to the negative output end of the rectifier bridge D1, the gate of the thyristor Q4 and the other end of the resistor R8 are connected to the collector of the transistor Q3, and the two input ends of the rectifier bridge D1 are respectively connected to the two ends of the solid-state switch circuit.

[0053] The solid-state switch circuit includes an electronic power device, which may be an IGBT power tube, a MOSFET power tube, an NPN power tube, or a thyristor. In this embodiment, the electronic power device is a bidirectional thyristor Q1. Specifically, the solid-state switch circuit includes a bidirectional thyristor Q1, a capacitor C1, a resistor R1, a resistor R2, and a resistor R9. The main electrode T1 of the bidirectional thyristor is connected to the current output end of the current detection circuit, the gate G of the bidirectional thyristor and one end of the resistor R1 are connected to one end of the photoelectric isolation circuit, one end of the resistor R9 is connected to the other end of the photoelectric isolation circuit, and the other end of the resistor R9 is connected to the current input end of the current detection circuit. The main electrode T2 of the bidirectional thyristor Q1 and the other end of the resistor R1 are connected to one end of the resistor R2, the other end of the resistor R2 is connected to one end of the capacitor C1, and the other end of the capacitor C1 is connected to the other end of the resistor R9.

[0054] The IoT solid-state relay of the present application embeds sensors (current sensors and temperature sensors) into the IoT solid-state relay. Compared with existing solid-state relay devices, the IoT solid-state relay of the present application can sense the operation of the IoT solid-state relay and its load circuit in a dangerous environment, as well as safety information about its surrounding environment, and upload the information to the cloud server through the IoT. The cloud server performs big data analysis on the collected current and temperature data of multiple IoT solid-state relays with the same purpose, and makes a mathematical model of information such as temperature and current in a normal state. When the monitored electrical parameter value obviously exceeds the wiring of the mathematical model, or is close to the preset relay abnormal alarm value, an early warning message is issued. Therefore, the system can achieve real-time perception and make accurate identification and quick response.

[0055] like Figure 2 As shown, based on the remote control function of the above-mentioned IoT solid-state relay, a remote monitoring system is established, including a cloud server, an IoT solid-state relay and a load circuit controlled by the IoT solid-state relay, a local control device controls the responsible circuit through the corresponding IoT solid-state relay, multiple IoT solid-state relays are connected to the cloud server, the cloud server is used to receive the status information uploaded by the IoT solid-state relay, the IoT solid-state relay is connected in the load circuit to control the power supply of the load device, the status information includes current and temperature information, and the cloud server can send a control signal to the IoT solid-state relay to turn on or off the load circuit. When the cloud server monitors that the current information uploaded by the IoT solid-state relay is greater than the current threshold, or less than the current threshold, or the cloud server monitors that the temperature information uploaded by the IoT solid-state relay is greater than the temperature threshold, or less than the temperature threshold, a warning message is issued and / or the IoT solid-state relay is disconnected.

[0056] As a preferred embodiment, the cloud server has an IoT solid-state relay grouping function, which groups multiple IoT solid-state relays connected to the network and performs different monitoring and protection configurations; users can group IoT solid-state relays according to the use environment of IoT solid-state relays, the equipment of the load circuit controlled by the relays, and other conditions, and set the current threshold and temperature threshold of each group of IoT solid-state relays. When an early warning message is issued to monitor that the current information uploaded by a certain IoT solid-state relay is greater than the current threshold of the corresponding group, or less than the current threshold of the corresponding group, or the temperature information uploaded by a certain IoT solid-state relay is greater than the temperature threshold of the corresponding group, or less than the temperature threshold of the corresponding group, an early warning message is issued and or the IoT solid-state relay is disconnected. It should be noted that the current threshold and temperature threshold here do not refer to the rated current or overload current of the IoT solid-state relay or the applicable temperature threshold of the IoT solid-state relay. The protection of the rated current or overload current or the applicable temperature threshold is generally self-protected by the MCU circuit of the IoT solid-state relay; the current threshold and temperature threshold here refer to the monitoring of the load circuit controlled by the IoT solid-state relay, and the cloud server protects the load circuit based on the information uploaded by the IoT solid-state relay. For example, the IoT solid-state relay uploads a temperature signal to the cloud server. The IoT solid-state relay is set close to the load device connected to the load circuit. The temperature signal of the IoT solid-state relay can simultaneously reflect the temperature of the IoT solid-state relay, the load device and its working environment. The current signal uploaded by the IoT solid-state relay to the cloud server also reflects the power consumption of the load device.

[0057] As a more preferred embodiment, the cloud server groups multiple Internet of Things solid-state relays connected to the network, analyzes the collected current and temperature data of the Internet of Things solid-state relays in the same group, and makes a mathematical model of the temperature and current information under normal conditions. When the temperature and current parameter values ​​of the Internet of Things solid-state relays in the group are monitored to obviously exceed the corresponding threshold value of the mathematical model, or when there is a situation close to the preset relay abnormal alarm value, an early warning message is issued and / or the Internet of Things solid-state relay is disconnected. For example, when there are 1,000 Internet of Things solid-state relays monitored at the same time, their working environment and load circuit equipment are similar, and one of them has a current or temperature information that is obviously higher or lower than that of other Internet of Things solid-state relays, indicating that there may be an abnormality in its working environment or load circuit equipment.

[0058] For example, one of the simplest mathematical models is the mean method. The cloud server calculates the mean of the current and temperature information of the IoT solid-state relays in the same group (which can be the real-time data mean or the mean combined with the long-term use data), obtains the current mean and the temperature mean, and weights the current mean to determine the maximum current threshold and / or the minimum current threshold, and weights the temperature mean to determine the maximum temperature threshold and / or the minimum temperature threshold. For example, the maximum current threshold is 130% of the current mean weighted, and the minimum current threshold is 50% of the current mean weighted. When the cloud server detects that the current value of a certain IoT solid-state relay in the group is greater than the maximum current threshold and / or less than the minimum current threshold, it issues a warning message and / or disconnects the IoT solid-state relay. For example, the maximum temperature threshold is 120% of the temperature mean weighted, and the minimum temperature threshold is 60% of the mean weighted. When the cloud server detects that the temperature value of a certain IoT solid-state relay in the group is greater than the maximum temperature threshold and / or less than the minimum temperature threshold, it issues a warning message and / or disconnects the IoT solid-state relay.

[0059] As another implementation method of the mathematical model, the cloud server makes a mathematical model of the fitting curve based on the collected temperature and current information, and fits the temperature and / or current information as variables to obtain the fitting curve. The maximum threshold curve and / or the minimum threshold curve are obtained by moving the fitting curve at a certain proportion, such as shifting upward to obtain the maximum threshold curve, and shifting downward to obtain the minimum threshold curve. When the cloud server monitors that the temperature and / or current variables of a certain IoT solid-state relay in the group are outside the maximum threshold curve and the minimum threshold curve, a warning message is issued and / or the IoT solid-state relay is disconnected. The fitting method may be the least squares method, Newton interpolation method, etc.

[0060] Of course, the mathematical model can also be a square difference method, a model based on deep learning, etc.

[0061] As a preferred solution, Figure 2 As described above, a software operating platform is provided on the cloud server, and users perform corresponding monitoring and management through the operating platform, including user management, authority setting, networking and grouping of IoT solid-state relays, threshold setting, and selection of mathematical models (the system has a variety of mathematical models preset, and the mathematical models for monitoring can also be customized).

[0062] There may be multiple IoT solid-state relays and load circuits controlled by the IoT solid-state relays. Multiple IoT solid-state relays and load circuits are controlled by the same cloud server and operation platform to form a remote centralized control system. When a fault occurs, the user can implement point-to-point or centralized protection of related equipment based on the cloud server.

[0063] The remote monitoring system of the present application can also be used in industrial production safety management systems. The solid-state relay uploads the temperature or current information to the cloud server. The cloud server performs big data calculations and processing on the acquired status information. When abnormal trends are found in the parameter data, abnormal information can be discovered early, such as aging of components, poor wiring of lines, and overload and stall of load equipment. The cloud server issues a warning alarm or directly performs fault protection.

[0064] The remote monitoring system of this embodiment enables the IoT solid-state relay to control the load circuit under the control of the cloud server to achieve remote control. At the same time, the IoT solid-state relay uploads status information to the cloud server, so that the operation platform can obtain the working status of the IoT solid-state relay and the load circuit in time, realizing remote monitoring. It is particularly suitable for monitoring polluting fields such as chemical industry and light industry, as well as workplaces such as furnaces and oil wells that are not convenient for real-time monitoring.

[0065] Preferably, the cloud server can also be used to monitor the life of the load device. The cloud server records the original state parameters of the IoT solid-state relay and the original parameters of the load device connected to the load circuit. The original parameters of both include a life decay curve. The IoT solid-state relay uploads a current signal to the cloud server each time it is turned on and off. The cloud server calculates the electrical life of the IoT solid-state relay by counting the number of times the IoT solid-state relay uploads the current signal and combining its original state parameters. At the same time, the opening and closing of the IoT solid-state relay is related to the opening and closing of the load device connected to the load circuit. When the cloud server obtains the electrical life of the IoT solid-state relay based on the number of counted current signals, the electrical life of the load device can also be calculated. For example, the electrical life of the IoT solid-state relay is 10,000 times, and the electrical life of the load device is 5,000 times. When the IoT solid-state relay is turned on and off for 4,500 times, the cloud server can remind the replacement of the load device. When the IoT solid-state relay is turned on and off for 9,000 times, the cloud server can remind the replacement of the IoT solid-state relay. That is, the cloud server obtains the status information of the IoT solid-state relay connected to it, determines the number of times the relay is turned on and / or closed, and compares it with the obtained rated life threshold of the IoT solid-state relay to obtain the electrical life of the IoT solid-state relay; and the cloud server also obtains the load electrical life threshold of the load device corresponding to the IoT solid-state relay connected to it, determines the number of times the load device is turned on and / or closed based on the status information uploaded by the IoT solid-state relay, and compares it with the load electrical life threshold to obtain the electrical life of the load device.

[0066] For example, a remote monitoring system is provided for application in polluting fields such as chemical industry and light industry. The load circuit in the remote monitoring system is a sewage valve circuit. The state information uploaded by the IoT solid-state relay to the cloud server includes a current signal, and the current signal is used to feedback the opening and closing state of the IoT solid-state relay and the opening and closing state of the sewage valve circuit. Compared with the existing sewage control and monitoring system, the present application has the advantages of being more direct and more accurate, and there is no need to modify the sewage valve circuit or sewage motor. For example, when the current signal uploaded by the IoT solid-state relay is greater than the sewage valve opening threshold, it means that the sewage valve is open and in the sewage state, otherwise the sewage valve is in the closed state. The cloud server records the number of times the sewage valve circuit is opened based on the acquired current signal, which is used to calculate the life of the sewage valve and remind when it is close to the service life. At the same time, the use of the sewage valve is monitored based on the current signal. When the abnormal current is too large or too small, an alarm prompts or shuts down the IoT solid-state relay.

[0067] A remote monitoring system is provided for use in the oil well field. The load circuit in the remote monitoring system is a petroleum equipment circuit. The state information uploaded by the Internet of Things solid-state relay to the cloud server includes a current signal and a temperature signal. The current signal is used to feedback the on / off state of the Internet of Things solid-state relay and the on / off state of the petroleum equipment circuit. The temperature signal is used to feedback the temperature of the Internet of Things solid-state relay and the temperature of the oil well equipment. The system is suitable for the application environment where the oil equipment is dispersedly arranged. The user sets up through the operation platform, groups the Internet of Things solid-state relays connected to the cloud server for controlling the oil well equipment, sets up a mathematical model that uses Newton interpolation method to fit the collected current and temperature information for monitoring (it may include previously stored data of the oil well equipment, or data collected later), obtains a maximum threshold curve and a minimum threshold curve based on the fitting curve obtained by the mathematical model, and when the cloud server monitors that the current and temperature variables of a certain Internet of Things solid-state relay are outside the maximum threshold curve and the minimum threshold curve, it issues a warning message and / or disconnects the Internet of Things solid-state relay.

[0068] Of course, the remote monitoring system of the present application can also be applied to heating furnace equipment, and can also be used in places where it is difficult for operators such as wind energy to reach, or such as meteorological or geological disaster monitoring equipment, and it is inconvenient for detection personnel to reach the site.

[0069] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. An Internet of Things solid-state relay, characterized in that: Including control circuit, photoelectric isolation circuit, solid-state switch circuit, NB-IOT module, current detection circuit and temperature detection circuit; The control circuit is connected to the input control terminal, and the control circuit includes a power supply circuit and a drive conduction circuit. The power supply circuit is used to supply power to the NB-IOT module, the current detection circuit, and the temperature detection circuit. The drive conduction circuit turns on or off the solid-state switch circuit through the photoelectric isolation circuit to turn on or off the load circuit of the relay; The NB-IOT module is used to connect to the cloud server. The NB-IOT module includes an MCU circuit. The MCU circuit is connected to the drive conduction circuit, the current detection circuit and the temperature detection circuit. The current detection circuit is connected in series between the solid-state switch circuit and the load circuit to detect the current signal flowing through the solid-state switch circuit. The temperature detection circuit is used to detect the internal temperature of the solid-state relay. The MCU circuit is used to process and upload the temperature and current signals to the cloud server.

2. The IoT solid-state relay according to claim 1, characterized in that: The photoelectric isolation circuit includes a photocoupler IC3. A connection signal is input at the input control end, and the control circuit generates a current signal and a voltage signal. The current signal is used to drive the photocoupler IC3 to turn on and then turn on the solid-state switch circuit. The voltage signal is used to power the NB-IOT module, the current detection circuit, and the temperature detection circuit. If the connection signal is not received at the input end, the NB-IOT module, the current detection circuit, and the temperature detection circuit do not work.

3. The IoT solid-state relay according to claim 1, characterized in that: The NB-IOT module also includes a transparent transmission module, which is used to transmit the signal processed by the MCU circuit to the cloud server.

4. The IoT solid-state relay according to claim 1, characterized in that: The MCU circuit also includes a protection circuit, which is controlled by a cloud server and connected to a drive conduction circuit. When a connection signal is input to the input control terminal, the NB-IOT module can receive a disconnection control signal from the cloud server, and the drive conduction circuit is disconnected through the protection circuit to disconnect the load circuit of the relay.

5. The IoT solid-state relay according to claim 4, characterized in that: The MCU circuit includes a chip IC1, which has multiple I / O ports for transmitting signals. The signal output end of the current detection circuit, the signal output end of the temperature detection circuit and the signal output end of the protection circuit are respectively connected to the three I / O ports; the protection circuit includes a resistor R10, a light-emitting diode D4 and a transistor Q5, one end of the resistor R10 is connected to the I / O port of IC1, the other end of the resistor R10 is connected to the base of the transistor Q5, the cathode of the light-emitting diode D4 is connected to the collector of the transistor Q5, and the emitter of the transistor Q5 and the anode of the light-emitting diode D4 are respectively connected to the drive conduction circuit.

6. The IoT solid-state relay according to claim 1, characterized in that: The temperature detection circuit includes a temperature sensor IC2, and a signal output pin DQ of the temperature sensor IC2 is connected to the MCU circuit of the NB-IOT module; the signal output pin DQ of the temperature sensor IC2 is connected to the power supply circuit through a resistor R5.

7. The IoT solid-state relay according to claim 1, characterized in that: The current detection circuit includes a current sampling chip IC4, a capacitor C3 and a capacitor C4. The current signal output terminal VIOUT of the current sampling chip IC4 is connected to the MCU circuit of the NB-IOT module, one end of the capacitor C3 is connected to the current signal output terminal VIOUT of the current sampling chip IC4, one end of the capacitor C4 and the power supply terminal VCC of the current sampling chip IC4 are connected to the power supply circuit of the control circuit, and the other ends of the capacitor C3 and the capacitor C4 and the ground terminal GND of the current sampling chip IC4 are connected to GND.

8. The IoT solid-state relay according to claim 1, characterized in that: The control circuit is connected to two input control terminals. The control circuit includes a resistor R3, a resistor R4, a capacitor C2, a capacitor C5, a transistor Q2, a light emitting diode D3 and a diode D2. One end of the resistor R3 is connected to one input control terminal, and the other end of the resistor R3 is respectively connected to the resistor R4 and the collector of the transistor Q2. The emitter of the transistor Q2 is used to power the MCU circuit, the temperature detection circuit and the current detection circuit. The other end of the resistor R4 is connected to the positive electrode of the capacitor C5, one end of the capacitor C2 and the positive electrode of the light emitting diode D3 are connected to the base of the transistor Q2, the cathode of the light emitting diode D3 and the positive electrode of the diode D2 are respectively connected to the two input terminals of the photoelectric isolation circuit, and the negative electrode of the capacitor C5, the other end of the capacitor C2 and the cathode of the diode D2 are connected to the other input control terminal and connected to GND.

9. The IoT solid-state relay according to claim 1, characterized in that: The photoelectric isolation circuit includes a photoelectric coupler IC3, a resistor R6, a resistor R7, a resistor R8, a transistor Q3, a thyristor Q4 and a rectifier bridge D1; The fourth pin of the photocoupler IC3 is connected to one end of the resistor R6, the other end of the resistor R6 and one end of the resistor R7 are connected to the base of the transistor Q3, the other end of the resistor R7, one end of the resistor R8 and the anode of the thyristor Q4 are connected to the positive output end of the rectifier bridge D1, the third pin of the photocoupler IC3, the emitter of the transistor Q3 and the cathode of the thyristor Q4 are connected to the negative output end of the rectifier bridge D1, the gate of the thyristor Q4 and the other end of the resistor R8 are connected to the collector of the transistor Q3, and the two input ends of the rectifier bridge D1 are respectively connected to the two ends of the solid-state switch circuit.

10. The Internet of Things solid-state relay according to claim 1, characterized in that: The solid-state switch circuit includes a bidirectional thyristor Q1, a capacitor C1, a resistor R1, a resistor R2 and a resistor R9. The main electrode T1 of the bidirectional thyristor is connected to the current output end of the current detection circuit, the gate G of the bidirectional thyristor and one end of the resistor R1 are connected to one end of the photoelectric isolation circuit, one end of the resistor R9 is connected to the other end of the photoelectric isolation circuit, the other end of the resistor R9 is connected to the current input end of the current detection circuit, the main electrode T2 of the bidirectional thyristor Q1 and the other end of the resistor R1 are connected to one end of the resistor R2, the other end of the resistor R2 is connected to one end of the capacitor C1, and the other end of the capacitor C1 is connected to the other end of the resistor R9.

11. The IoT solid-state relay according to claim 1, characterized in that: The solid-state switch circuit includes an electronic power device, and the electronic power device is an IGBT power tube, a MOSFET power tube, an NPN power tube, or a thyristor.

12. A remote monitoring system, characterized in that: It includes a cloud server for receiving status information uploaded by the Internet of Things solid-state relay according to any one of claims 1 to 11, wherein the Internet of Things solid-state relay is connected in a load circuit for controlling the power supply of the load device, and the status information includes current and temperature information. The cloud server can send a control signal to the Internet of Things solid-state relay to turn on or off the load circuit.

13. A remote monitoring system according to claim 12, characterized in that: When the cloud server monitors that the current information uploaded by the IoT solid-state relay is greater than the current threshold, or less than the current threshold, or the cloud server monitors that the temperature information uploaded by the IoT solid-state relay is greater than the temperature threshold, or less than the temperature threshold, an early warning message is issued and / or the IoT solid-state relay is disconnected.

14. A remote monitoring system according to claim 12, characterized in that: The cloud server groups multiple networked IoT solid-state relays, and sets the current threshold and temperature threshold of each group of IoT solid-state relays respectively. When an early warning message is issued and it is monitored that the current information uploaded by a certain IoT solid-state relay is greater than the current threshold of the corresponding group, or less than the current threshold of the corresponding group, or when it is monitored that the temperature information uploaded by a certain IoT solid-state relay is greater than the temperature threshold of the corresponding group, or less than the temperature threshold of the corresponding group, an early warning message is issued and / or the IoT solid-state relay is disconnected.

15. A remote monitoring system according to claim 12, characterized in that: The cloud server groups multiple networked IoT solid-state relays, analyzes the collected current and temperature data of the IoT solid-state relays in the same group and generates a mathematical model. When it is monitored that the temperature and current information of the IoT solid-state relays in the group obviously exceeds the corresponding threshold value of the mathematical model, an early warning message is issued and / or the IoT solid-state relays are disconnected.

16. A remote monitoring system according to claim 15, characterized in that: The cloud server makes a mathematical model of the fitting curve based on the temperature and current information collected by the IoT solid-state relays in the same group, fits the temperature and / or current information as variables to obtain the fitting curve, and obtains the maximum threshold curve and / or the minimum threshold curve based on the fitting curve. When the cloud server monitors that the temperature and / or current variables of a certain IoT solid-state relay in the group are outside the maximum threshold curve and the minimum threshold curve, an early warning message is issued and / or the IoT solid-state relay is disconnected.

17. A remote monitoring system according to claim 12, characterized in that: The cloud server records the original state parameters of the IoT solid-state relay and the original parameters of the load device connected to the load circuit, and the cloud server calculates the electrical life of the IoT solid-state relay and / or the load device through the state information uploaded by the IoT solid-state relay.

18. A remote monitoring system according to claim 12, characterized in that: The load circuit is a sewage valve circuit, and the status information uploaded by the IoT solid-state relay to the cloud server includes a current signal, and the current signal is used to feedback the opening and closing status of the IoT solid-state relay and the opening and closing status of the sewage valve circuit; and or, the cloud server records the number of times the sewage valve circuit is opened based on the acquired current signal, which is used to calculate the life of the sewage valve.

19. A remote monitoring system according to claim 12, characterized in that: The load circuit is a petroleum equipment circuit. The status information uploaded by the IoT solid-state relay to the cloud server includes a current signal and a temperature signal. The current signal is used to feedback the on / off status of the IoT solid-state relay and the on / off status of the petroleum equipment circuit. The temperature signal is used to feedback the temperature of the IoT solid-state relay and the temperature of the oil well equipment.

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