Intelligent socket circuit with fireproof and current-limiting effects

Abstract

The utility model discloses an intelligent socket circuit with fireproof and current-limiting effects, which is internally provided with a Bluetooth module, a WIFI module, a metering module, a main control module, an electric leakage acquisition module, a voltage acquisition module, a current acquisition module, a power supply module, a switching power supply module, an MOS driving module, a current path module and a temperature monitoring module. All the modules are connected to a PCB of a circuit board in the socket in a contact pin welding mode, and conduction among the modules is achieved through copper wires on the PCB. The voltage and current acquisition module is composed of a mutual inductor and a sampling circuit, is connected with the main control module and the metering module and is used for data acquisition and metering of parameters such as power and electric energy, the Bluetooth module and the WIFI module are connected with the main control module in a USART mode, and the power utilization condition of the intelligent socket can be obtained in real time in cooperation with a transmission protocol and an upper computer. And remote wireless operation is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic equipment in power systems, and particularly to an intelligent socket circuit with fire prevention and current limiting functions. Background Art

[0002] A socket, usually called a power socket or wall plug, is a basic electrical device in modern life, mainly used to provide power for various devices. It is usually installed on a wall or a fixed structure, and has standardized dimensions and shapes to ensure compatibility and safety in different countries and regions. Sockets are designed with different voltage and current specifications to adapt to a variety of electrical appliances. At the same time, modern sockets generally have safety features such as electric shock protection doors, overload and short circuit protection. There are various types of sockets, including household, commercial, industrial, intelligent sockets, USB sockets and multi-functional sockets, meeting different usage requirements from households to industries. With technological progress, innovative products such as intelligent sockets not only improve energy use efficiency but also increase the convenience of use.

[0003] However, the protection functions of current intelligent sockets on the market are not comprehensive enough, and their fire prevention and electric shock prevention performances are relatively low, with great deficiencies in leakage protection. In addition, some intelligent sockets with protection functions have problems such as slow response speed, low reliability and low safety. Therefore, it is necessary to develop a more advanced, safe and reliable intelligent socket to meet the requirements for safety, reliability, efficiency and energy saving in the power system. Summary of the Utility Model

[0004] To overcome the deficiencies of the prior art, the utility model proposes an intelligent socket circuit with fire prevention and current limiting functions. The utility model proposes an intelligent socket circuit with fire prevention and current limiting functions. This intelligent socket circuit uses semiconductor devices (field effect transistors) as switching elements, and can cut off the fault current at the microsecond level when a fault occurs in the circuit. It has overload protection, short circuit protection, leakage protection and load identification functions. At the same time, it also has functions such as Bluetooth and WiFi. Through this intelligent socket, the protection of electronic circuits and electrical products can be realized, and the danger of electric shock to people can be avoided.

[0005] The technical solution adopted by the utility model to solve the above technical problems is: design an intelligent socket circuit with fire prevention and current limiting functions, characterized in that a Bluetooth module, a WIFI module, a metering module, a main control module, a leakage current acquisition module, a voltage acquisition module, a current acquisition module, a power supply module, a switching power supply module, a MOS drive module, a current path module and a temperature monitoring module are arranged in this intelligent socket circuit. Each module is connected to the PCB board of the internal circuit board of the socket by means of pin welding, and the conduction between modules is realized through the copper wires on the PCB board;

[0006] The Bluetooth module includes a light-emitting diode (LEDA), a first resistor (R1), a twenty-ninth capacitor (C29), a thirtieth capacitor (C30), and a Bluetooth chip (BLE1); the +3.3V DC power supply is connected to the positive electrode of the light-emitting diode (LEDA), the negative electrode of the light-emitting diode (LEDA) is connected in series with one end of the first resistor R1, and the other end of the first resistor (R1) is connected to the 1st pin of the Bluetooth chip (BLE1); the +3.3V DC power supply is connected to the upper ends of the twenty-ninth capacitor (C29) and the thirtieth capacitor (C30) and connected to the 5th pin of the Bluetooth chip (BLE1), and the lower ends of the twenty-ninth capacitor (C29) and the thirtieth capacitor (C30) are connected to the ground; the 6th pin of the Bluetooth chip (BLE1) is grounded; the 2nd pin, 7th pin, 10th pin, 11th pin, and 12th pin of the Bluetooth chip (BLE1) are respectively connected to the 35th pin, 34th pin, 52nd pin, 51st pin, and 33rd pin of the MCU chip ((U10)) in the main control module;

[0007] The WiFi module includes a seventy-fifth resistor (R75), a seventy-sixth resistor (R76), a seventy-seventh resistor (R77), a seventy-eighth resistor (R78), a thirty-ninth capacitor (C39), a sixty-sixth capacitor (C66), and a WiFi chip (U11); the 3.3V DC power supply is respectively connected to one end of the seventy-sixth resistor (R76), one end of the seventy-fifth resistor (R75), one end of the thirty-ninth capacitor (C39), one end of the sixty-sixth capacitor (C66), the 8th pin of the WiFi chip (U11), and one end of the seventy-seventh resistor (R77), the other end of the seventy-fifth resistor (R75) is connected to the 1st pin of the WiFi chip (U11), and the other end of the seventy-sixth resistor (R76) is connected to the 2nd pin of the WiFi chip (U11); the other ends of the thirty-ninth capacitor (C39) and the sixty-sixth capacitor (C66) are connected in parallel and then grounded; the other end of the seventy-seventh resistor (R77) is connected to the 18th pin of the WiFi chip (U11); one end of the seventy-eighth resistor (R78) is connected to the 16th pin of the WiFi chip (U11), and its other end is connected in parallel with the 15th pin of the WiFi chip (U11) and then grounded; the 21st pin and 22nd pin of the WiFi chip (U11) are respectively connected to the 17th pin and 16th pin of the MCU chip ((U10)) in the main control module;

[0008] The metering module includes an RN8209D metering chip (U3), a forty-second capacitor (C42), a forty-third capacitor (C43), a fifty-fifth resistor (R55), a fifty-sixth resistor (R56), a forty-fourth capacitor (C44), a forty-fifth capacitor (C45), a fifty-ninth resistor (R59), a forty-eighth capacitor (C48), a fiftieth capacitor (C50), and a twenty-first electrolytic capacitor (C21); one end of the forty-second capacitor (C42), one end of the forty-third capacitor (C43), and one end of the fifty-fifth resistor (R55) are connected in parallel and then connected to the 18th pin of the RN8209D metering chip (U3); the other end of the fifty-fifth resistor (R55), one end of the forty-fourth capacitor (C44), and one end of the forty-fifth capacitor (C45) are connected in parallel and then connected to the 1st pin of the RN8209D metering chip (U3); the other end of the forty-second capacitor (C42), the other end of the forty-third capacitor (C43), and one end of the fifty-sixth resistor (R56) are connected in parallel and then connected to GND; the other end of the fifty-sixth resistor (R56), the other end of the forty-fourth capacitor (C44), and the other end of the forty-fifth capacitor (C45) are connected in parallel and then connected to AGND; one end of the fifty-ninth resistor (R59) is connected to the 3.3V DC power supply, the other end of the fifty-ninth resistor (R59) is connected in parallel with one end of the forty-eighth capacitor (C48) and then connected to the 2nd pin of the RN8209D metering chip (U3), and the other end of the forty-eighth capacitor (C48) is connected to AGND; one end of the fiftieth capacitor (C50) is connected in parallel with one end of the twenty-first electrolytic capacitor (C21) and then connected to the 10th pin of the RN8209D metering chip (U3), the other end of the fiftieth capacitor (C50), the other end of the twenty-first electrolytic capacitor (C21), and the 12th pin of the RN8209D metering chip (U3) are connected in parallel and then connected to GND; the 11th pin of the RN8209D metering chip (U3) is connected to AGND; the 13th pin and the 14th pin of the RN8209D metering chip (U3) are correspondingly connected to the 17th pin and the 16th pin of the MCU chip ((U10));

[0009] The main control module includes an MCU chip (U10), a crystal oscillator circuit, and a reset circuit; the crystal oscillator circuit consists of capacitor C36, capacitor C40, crystal oscillator X2, capacitor C33, capacitor C38, and crystal oscillator X3; connect the 1st pin and the 2nd pin of crystal oscillator X2 to the 6th pin and the 5th pin of the MCU chip (U10) respectively; lead out a conducting wire from the 1st pin of crystal oscillator X2 and connect it to the right end of capacitor C40, lead out a conducting wire from the 2nd pin of crystal oscillator X2 and connect it to the right end of capacitor C36, and connect the left ends of capacitor C40 and capacitor C36 in parallel and then to ground; connect the 1st pin and the 2nd pin of crystal oscillator X3 to the 4th pin and the 3rd pin of the MCU chip (U10) respectively; lead out a conducting wire from the 1st pin of crystal oscillator X3 and connect it to the right end of capacitor C38, lead out a conducting wire from the 2nd pin of crystal oscillator X3 and connect it to the right end of capacitor C33, and connect the left ends of capacitor C38 and capacitor C33 in parallel and then to ground; the reset circuit consists of resistor R66 and capacitor C51, connect the upper end of resistor R66 to the +3.3V DC power supply of the power supply module, lead out two conducting wires from the lower end of resistor R66, and connect them to the 7th pin of the MCU chip (U10) and the upper end of capacitor C51 respectively, and connect the lower end of capacitor C51 to ground;

[0010] The leakage current acquisition module includes a leakage current transformer, resistor R44, resistor R47, and operational amplifier IC1A of type MCP6004-I / ST; connect the 1st pin of the leakage current transformer to the upper end of resistor R44 and the 2nd pin of the operational amplifier IC1A of type MCP6004-I / ST, connect the 2nd pin of the leakage current transformer to the lower end of resistor R47 and the 3rd pin of the operational amplifier IC1A of type MCP6004-I / ST, and connect the lower end of resistor R44 and the upper end of resistor R47 in parallel and then to ground; the live wire and the neutral wire pass through the magnetic core of the leakage current transformer, and the 1st pin of its operational amplifier IC1A of type MCP6004-I / ST is connected to the 22nd pin of the MCU chip (U10) in the main control module;

[0011] The voltage acquisition module includes a voltage transformer, resistor R73, resistor R74, capacitor C62, and capacitor C63. The 1st pin of the voltage transformer, the upper end of resistor R73, and the upper end of capacitor C62 are connected in parallel and then connected to the 8th pin of the RN8209D metering chip (U3) in the metering module. The 2nd pin of the voltage transformer, the lower end of resistor R74, and the lower end of capacitor C63 are connected in parallel and then connected to the 9th pin of the RN8209D metering chip (U3) in the metering module. The lower end of resistor R73 and the upper end of resistor R74 are connected in parallel to ground. The lower end of capacitor C62 and the upper end of capacitor C63 are connected in parallel to ground. This module is used to acquire voltage.

[0012] The current acquisition module includes a current transformer, resistor R12, resistor R20, and the MCP6004-I / ST operational amplifier (IC1C). The 1st pin of the current transformer and the upper end of resistor R12 are both connected to the 9th pin of the MCP6004-I / ST operational amplifier (IC1C). The 2nd pin of the leakage current transformer and the lower end of resistor R20 are both connected to the 10th pin of the MCP6004-I / ST operational amplifier (IC1C). The lower end of resistor R12 and the upper end of resistor R20 are connected in parallel to ground. The 8th pin of the MCP6004-I / ST operational amplifier (IC1C) in this module is connected to the 56th pin of the MCU chip (U10) in the main control module.

[0013] The power supply module includes a TPS54202DDCR power chip (U1), an LM1117IMPX-3.3 chip (U2), a twenty-eighth resistor (R28), a twenty-ninth resistor (R29), a thirtieth resistor (R30), a thirty-first resistor (R31), and a twenty-fifth capacitor (C25); the 1st pin of the TPS54202DDCR power chip (U1) is connected in parallel with the lower end of the twenty-ninth resistor (R29) and then grounded, its 5th pin is connected to the upper end of the twenty-ninth resistor (R29) and the lower end of the twenty-eighth resistor (R28), its 3rd pin is connected to the upper end of the twenty-eighth resistor (R28) and the 12V power supply, its 4th pin is connected to the lower end of the thirtieth resistor (R30) and the left end of the thirty-first resistor (R31), the right end of the thirty-first resistor (R31) is grounded, its 2nd pin is connected to the upper end of the thirtieth resistor (R30), the lower end of the twenty-fifth capacitor (C25), and the 3rd pin of the LM1117IMPX-3.3 chip (U2), its 6th pin is connected to the upper end of the twenty-fifth capacitor (C25); the 2nd pin of the LM1117IMPX-3.3 chip (U2) outputs a 3.3V power supply, and its 1st pin is grounded; the 12V input port of the TPS54202DDCR power chip (U1) is connected to the left end of the inductor (L2) in the switching power supply module; the power supply module receives the 12V power supply output by the switching power supply module and outputs a 3.3V power supply;

[0014] The switching power supply module includes a switching power supply chip (LS1), an inductor (L2), a nineteenth tantalum capacitor (C19), and a twentieth tantalum capacitor (C20). The switching power supply module is a separate power supply module; the positive pole of the nineteenth tantalum capacitor (C19) is connected to the 3rd pin of the switching power supply chip (LS1), and its negative pole is connected to the 4th pin of the switching power supply chip (LS1); the 5th pin of the switching power supply chip (LS1) is grounded, its 6th pin is connected to the positive pole of the twentieth tantalum capacitor (C20), and a wire is led out from the positive pole of the twentieth tantalum capacitor (C20) to connect to the right end of the inductor (L2), and the negative pole of the twentieth tantalum capacitor (C20) is grounded; the left end of the inductor (L2) is the output terminal of the 12V power supply, and 220V alternating current is connected to the 1st and 2nd pins of the switching power supply module to supply power to the switching power supply module;

[0015] The MOS drive module is driven by a MOS drive chip (U4). The 1st pin and the 2nd pin of the MOS drive chip (U4) are connected in parallel to form a second wiring terminal, and the 3rd pin and the 4th pin are connected in parallel to form a first wiring terminal. The second wiring terminal and the first wiring terminal give drive control signals; the 6th pin and the 8th pin of the MOS drive chip (U4) are grounded, and the 7th pin is connected to the left end of the inductor (L2) of the switching power supply module; the 5th pin of the MOS drive chip (U4) is connected to a pin header, and through this pin header, it is connected to the 14th pin of the MCU chip (U10) in the main control module;

[0016] The main current path module includes four groups of MOS transistor components connected in parallel and a snubber circuit; each group of MOS transistor components includes two upper and lower MOS transistor components, and each MOS transistor component is composed of a MOS transistor, a first resistor, a second resistor, and a Schottky diode. Among them, the gate of the MOS transistor in the upper MOS transistor component is connected to one end of the first resistor, one end of the second resistor, and the cathode of the Schottky diode. The other end of the first resistor is connected to the first terminal of a MOS driver module; the source of the upper MOS transistor, the anode of the Schottky diode, and the other end of the second resistor are connected in parallel and then connected to the second terminal of the MOS driver module; the lower MOS transistor component has the same structure as the upper MOS transistor component, and the lower MOS transistor component is connected to the first terminal and the second terminal of another MOS driver module. The drain of the MOS transistor in the upper MOS transistor component is connected to the live wire inlet end, the source of the MOS transistor in the upper MOS transistor component is connected to the source of the MOS transistor in the lower MOS transistor component, and the drain of the MOS transistor in the lower MOS transistor component is connected to the live wire outlet end;

[0017] The four groups of MOS transistor components have the same structure and are connected in parallel in the same connection manner; the snubber circuit includes a ninety-fifth resistor (R95), a seventieth capacitor (C70), and a varistor (Rp1); the ninety-fifth resistor (R95) and the seventieth capacitor (C70) are connected in series and then connected in parallel with the varistor (Rp1), and both ends of the circuit formed after parallel connection are respectively connected to the inlet end and the outlet end of the live wire; each MOS transistor component is connected to a MOS driver module, and the four groups of MOS transistor components are connected to eight MOS driver modules;

[0018] The temperature detection module includes a temperature sensor, resistor R5, resistor R6, resistor R7, resistor R8, capacitor C10, capacitor C11, capacitor C12, and capacitor C13; one temperature sensor is correspondingly connected between the 1st pin and the 2nd pin, the 3rd pin and the 4th pin, the 5th pin and the 6th pin, and the 7th pin and the 8th pin of the pin header P7. The four temperature sensors are connected to the main control module MCU chip U10 through the pin header P7. The 2nd pin, 4th pin, 6th pin, and 8th pin of the pin header P7 are respectively and correspondingly connected to the 8th pin, 25th pin, 11th pin, and 9th pin of the main control module MCU chip U10; the 2nd pin of the pin header P7 is connected to the lower end of resistor R8 and the upper end of capacitor C13, the 4th pin of the pin header P7 is connected to the lower end of resistor R7 and the upper end of capacitor C12, the 6th pin of the pin header P7 is connected to the lower end of resistor R6 and the upper end of capacitor C11, and the 8th pin of the pin header P7 is connected to the lower end of resistor R5 and the upper end of capacitor C10. The upper ends of the above four resistors are all connected to a 3.3V DC power supply, and the lower ends of the above four capacitors are all grounded.

[0019] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0020] 1. Using a semiconductor device (field effect transistor) as a switching element, when a fault occurs in the power output line of the socket, the fault current can be quickly cut off at the microsecond level, ensuring the use safety of the connected electrical appliances and avoiding the occurrence of electrical fires.

[0021] 2. The structure of the present utility model is simple, the volume is small, it is convenient for installation, the cost is low, and the practicability is strong. It can detect the electric energy usage of electrical appliances in real time, intelligently identify the power of electrical appliances, and can intelligently identify the required electric energy according to the connected electrical appliances. When a fault occurs, the fault current is immediately cut off, and the charging status of the charging device can be detected to avoid fires caused by the long-term floating charge and heating of the charging device.

[0022] 3. The interactive communication is jointly realized by using WiFi communication, Bluetooth communication, and a human-computer interaction module composed of a screen, buttons, and indicator lights. Through the interaction, the parameters of the internal protection function can be modified in real time, enabling the user to observe the power consumption information in real time at a short or long distance, adapting to more power usage scenarios and different power usage requirements, and providing a structural basis for an efficient, reliable, and intelligent power distribution method. Description of the Drawings

[0023] Figure 1 It is a schematic diagram of the module connection of an intelligent socket circuit with a fire prevention and current limiting function of the present utility model.

[0024] Figure 2 Schematic diagram of the Bluetooth module circuit structure of an embodiment of an intelligent socket circuit with fire prevention and current limiting functions according to the present utility model.

[0025] Figure 3 Schematic diagram of the WiFi module circuit structure of an embodiment of an intelligent socket circuit with fire prevention and current limiting functions according to the present utility model.

[0026] Figure 4 Schematic diagram of the metering module circuit structure of an embodiment of an intelligent socket circuit with fire prevention and current limiting functions according to the present utility model.

[0027] Figure 5 Schematic diagram of the main control module circuit structure of an embodiment of an intelligent socket circuit with fire prevention and current limiting functions according to the present utility model.

[0028] Figure 6 Schematic diagram of the leakage acquisition module circuit structure of an embodiment of an intelligent socket circuit with fire prevention and current limiting functions according to the present utility model.

[0029] Figure 7 Schematic diagram of the voltage acquisition module circuit structure of an embodiment of an intelligent socket circuit with fire prevention and current limiting functions according to the present utility model.

[0030] Figure 8 Schematic diagram of the current acquisition module circuit structure of an embodiment of an intelligent socket circuit with fire prevention and current limiting functions according to the present utility model.

[0031] Figure 9 Schematic diagram of the key circuit structure of the human-computer interaction module of an embodiment of an intelligent socket circuit with fire prevention and current limiting functions according to the present utility model; wherein, Figure 9 (a) thereof is the schematic diagram of the first group of key circuits, Figure 9 (b) thereof is the schematic diagram of the second group of key circuits, Figure 9 (c) thereof is the schematic diagram of the third group of key circuits, Figure 9 (d) thereof is the schematic diagram of the fourth group of key circuits, Figure 9 (e) thereof is the schematic diagram of the fifth group of key circuits.

[0032] Figure 10 Schematic diagram of the indicator light circuit structure of the human-computer interaction module of an embodiment of an intelligent socket circuit with fire prevention and current limiting functions according to the present utility model.

[0033] Figure 11 Schematic diagram of the screen circuit structure of the human-computer interaction module of an embodiment of an intelligent socket circuit with fire prevention and current limiting functions according to the present utility model.

[0034] Figure 12 Schematic diagram of the power supply module circuit structure of an embodiment of an intelligent socket circuit with fire prevention and current limiting functions according to the present utility model.

[0035] Figure 13 Schematic diagram of the switching power supply module circuit structure of an embodiment of an intelligent socket circuit with fire prevention and current limiting functions according to the present utility model.

[0036] Figure 14 Schematic diagram of the MOS drive module circuit structure of an embodiment of an intelligent socket circuit with fire prevention and current limiting functions according to the present utility model.

[0037] Figure 15 Schematic diagram of the current path module circuit structure of an embodiment of an intelligent socket circuit with fire prevention and current limiting functions according to the present utility model.

[0038] Figure 16 Schematic diagram of the temperature monitoring module circuit structure of an embodiment of an intelligent socket circuit with fire prevention and current limiting functions according to the present utility model. Detailed implementation manners

[0039] In order to make the present utility model more understandable, the technical solutions of the present utility model will be further described below in conjunction with the detailed implementation manners and the accompanying drawings, which are not used to limit the protection scope of the present application.

[0040] The present utility model relates to an intelligent socket circuit with fire prevention and current limiting functions. A Bluetooth module, a WIFI module, a metering module, a main control module, a leakage current acquisition module, a voltage acquisition module, a current acquisition module, a human-computer interaction module, a power supply module, a switching power supply module, a MOS drive module, a current path module, and a temperature monitoring module are provided in the intelligent socket circuit. Each module is connected to the PCB board of the internal circuit board of the socket by means of pin soldering, and the conduction between the modules is realized through the copper wires on the PCB board.

[0041] The Bluetooth module (see Figure 2)It includes light-emitting diode LEDA, resistor R1, capacitor C29, capacitor C30, and Bluetooth chip BLE1. The +3.3V DC power supply is connected to the positive electrode of the light-emitting diode LEDA. The negative electrode of the light-emitting diode LEDA is connected in series with one end of the resistor R1. The other end of the resistor R1 is connected to the 1st pin of the Bluetooth chip BLE1. The +3.3V DC power supply is connected to the upper ends of the capacitor C29 and the capacitor C30 and is connected to the 5th pin of the Bluetooth chip BLE1. The lower ends of the capacitor C29 and the capacitor C30 are connected to the ground. The 6th pin of the Bluetooth chip BLE1 is grounded. The 2nd pin, 7th pin, 10th pin, 11th pin, and 12th pin of the Bluetooth chip BLE1 are respectively connected to the 35th pin, 34th pin, 52nd pin, 51st pin, and 33rd pin of the MCU chip U10 in the main control module. The Bluetooth module realizes Bluetooth communication with a mobile phone or other control terminals through connection with the MCU chip U10 of the main control module for data transmission, facilitating the user to obtain the power consumption situation of the electrical appliance in real time.

[0042] The WiFi module (see Figure 3 )It includes resistor R75, resistor R76, resistor R77, resistor R78, capacitor C39, capacitor C66, and WiFi chip U11. The 3.3V DC power supply is respectively connected to one end of the resistor R76, one end of the resistor R75, one end of the capacitor C39, one end of the capacitor C66, the 8th pin of the WiFi chip U11, and one end of the resistor R77. The other end of the resistor R75 is connected to the 1st pin of the WiFi chip U11. The other end of the resistor R76 is connected to the 2nd pin of the WiFi chip U11. The other ends of the capacitor C39 and the capacitor C66 are connected in parallel and then grounded. The other end of the resistor R77 is connected to the 18th pin of the WiFi chip U11. One end of the resistor R78 is connected to the 16th pin of the WiFi chip U11, and its other end is connected in parallel with the 15th pin of the WiFi chip U11 and then grounded. This module is used for external communication together with Bluetooth. The 21st pin and 22nd pin of the WiFi chip U11 are respectively connected to the 17th pin and 16th pin of the MCU chip U10 of the main control module. In the case of connecting to the network, it can realize real-time viewing of the power consumption information of the smart socket.

[0043] The metering module (see Figure 4)It includes the RN8209D metering chip U3, the forty-second capacitor C42, the forty-third capacitor C43, the fifty-fifth resistor R55, the fifty-sixth resistor R56, the forty-fourth capacitor C44, the forty-fifth capacitor C45, the fifty-ninth resistor R59, the forty-eighth capacitor C48, the fiftieth capacitor C50, and the twenty-first electrolytic capacitor C21. One end of the forty-second capacitor C42, one end of the forty-third capacitor C43, and one end of the fifty-fifth resistor R55 are connected in parallel and then connected to the 18th pin of the RN8209D metering chip U3; the other end of the fifty-fifth resistor R55, one end of the forty-fourth capacitor C44, and one end of the forty-fifth capacitor C45 are connected in parallel and then connected to the 1st pin of the RN8209D metering chip U3; the other end of the forty-second capacitor C42, the other end of the forty-third capacitor C43, and one end of the fifty-sixth resistor R56 are connected in parallel and then connected to GND; the other end of the fifty-sixth resistor R56, the other end of the forty-fourth capacitor C44, and the other end of the forty-fifth capacitor C45 are connected in parallel and then connected to AGND. One end of the fifty-ninth resistor R59 is connected to the 3.3V DC power supply, and the other end of the fifty-ninth resistor R59 is connected in parallel with one end of the forty-eighth capacitor C48 and then connected to the 2nd pin of the RN8209D metering chip U3, and the other end of the forty-eighth capacitor C48 is connected to AGND. One end of the fiftieth capacitor C50 and one end of the twenty-first electrolytic capacitor C21 are connected in parallel and then connected to the 10th pin of the RN8209D metering chip U3, and the other end of the fiftieth capacitor C50, the other end of the twenty-first electrolytic capacitor C21, and the 12th pin of the RN8209D metering chip U3 are connected in parallel and then connected to GND. The 11th pin of the RN8209D metering chip U3 is connected to AGND. The 13th pin (RX) and the 14th pin (TX) of the RN8209D metering chip U3 are correspondingly connected to the 17th pin and the 16th pin of the MCU chip U10. The metering module is used to meter the real-time power and electricity parameters of the electrical appliances of the smart socket.

[0044] The main control module (see Figure 5)It includes an MCU chip U10 (model STM32F103RCT6-LQFP64), a crystal oscillator circuit, and a reset circuit. The crystal oscillator circuit consists of capacitor C36, capacitor C40, crystal oscillator X2, capacitor C33, capacitor C38, and crystal oscillator X3. Connect the 1st pin and the 2nd pin of crystal oscillator X2 to the 6th pin and the 5th pin of MCU chip U10 respectively; another conducting wire is led out from the 1st pin of crystal oscillator X2 and connected to the right end of capacitor C40, and another conducting wire is led out from the 2nd pin of crystal oscillator X2 and connected to the right end of capacitor C36. The left ends of capacitor C40 and capacitor C36 are connected in parallel and then grounded; connect the 1st pin and the 2nd pin of crystal oscillator X3 to the 4th pin and the 3rd pin of MCU chip U10 respectively; another conducting wire is led out from the 1st pin of crystal oscillator X3 and connected to the right end of capacitor C38, and another conducting wire is led out from the 2nd pin of crystal oscillator X3 and connected to the right end of capacitor C33. The left ends of capacitor C38 and capacitor C33 are connected in parallel and then grounded. The reset circuit consists of resistor R66 and capacitor C51. The upper end of resistor R66 is connected to the +3.3V DC power supply of the power supply module. Two conducting wires are led out from the lower end of resistor R66 and connected to the 7th pin of MCU chip U10 and the upper end of capacitor C51 respectively. The lower end of capacitor C51 is grounded; the reset circuit is used for software program reset;

[0045] The leakage current acquisition module (see Figure 6 ) includes a leakage current transformer, resistor R44, resistor R47, and operational amplifier IC1A of type MCP6004-I / ST. Connect the 1st pin of the leakage current transformer to the upper end of resistor R44 and the 2nd pin of operational amplifier IC1A of type MCP6004-I / ST, and connect the 2nd pin of the leakage current transformer to the lower end of resistor R47 and the 3rd pin of operational amplifier IC1A of type MCP6004-I / ST. The lower end of resistor R44 and the upper end of resistor R47 are connected in parallel and then grounded. The live wire and the neutral wire pass through the magnetic core of the leakage current transformer, and its 1st pin of operational amplifier IC1A of type MCP6004-I / ST is connected to the 22nd pin of MCU chip U10 in the main control module. This module is used for acquiring leakage current signals.

[0046] The voltage acquisition module (see Figure 7)It includes a voltage transformer, resistor R73, resistor R74, capacitor C62, and capacitor C63. The 1st pin of the voltage transformer, the upper end of resistor R73, and the upper end of capacitor C62 are connected in parallel and then connected to the 8th pin of the RN8209D metering chip U3 in the metering module; the 2nd pin of the voltage transformer, the lower end of resistor R74, and the lower end of capacitor C63 are connected in parallel and then connected to the 9th pin of the RN8209D metering chip U3 in the metering module; the lower end of resistor R73 and the upper end of resistor R74 are connected in parallel to ground, and the lower end of capacitor C62 and the upper end of capacitor C63 are connected in parallel to ground. This module is used to collect voltage.

[0047] The current acquisition module (see Figure 8 ) includes a current transformer, resistor R12, resistor R20, and the dual op-amp IC1C of MCP6004-I / ST. The 1st pin of the current transformer and the upper end of resistor R12 are both connected to the 9th pin of the dual op-amp IC1C of MCP6004-I / ST. The 2nd pin of the leakage current transformer and the lower end of resistor R20 are both connected to the 10th pin of the dual op-amp IC1C of MCP6004-I / ST. The lower end of resistor R12 and the upper end of resistor R20 are connected in parallel to ground. The 8th pin of the dual op-amp IC1C of MCP6004-I / ST in this module is connected to the 56th pin of the MCU chip U10 in the main control module. Only the neutral wire passes through the current transformer. This module is used to collect current.

[0048] The human-machine interaction module (see Figure 9 、 Figure 10 、 Figure 11 ) includes five groups of key circuits, an indicator light circuit, and a screen. The output terminals Key_1, Key_2, Key_3, Key_4, and Key_5 of the five groups of key circuits are respectively and correspondingly connected to the 57th pin, 58th pin, 59th pin, 61st pin, and 62nd pin of the MCU chip U10 in the main control module; the output terminals LED1, LED2, and LED3 of the indicator light circuit are respectively and correspondingly connected to the 50th pin, 53rd pin, and 54th pin of the MCU chip U10 in the main control module;

[0049] The structures of the five groups of key circuits are the same. Taking the first group of key circuits as an example for structure description, the first group of key circuits includes resistor R35, capacitor C22, and key U5; the 1st pin of key U5, the lower end of resistor R35, and the lower end of capacitor C22 are connected in parallel to form the output terminal Key_1 of the first group of key circuits. The 2nd pin of key U5 is connected to the upper end of capacitor C22 and grounded. The upper end of resistor R35 is connected to the 3.3V DC power supply.

[0050] The five groups of key circuits are composed of resistor R35, capacitor C22, key U5, resistor R36, capacitor C23, key U6, resistor R37, capacitor C24, key U7, resistor R38, capacitor C25, key U8, resistor R39, and capacitor C26, key U9. The 1st pin of key U5 is connected to the lower end of resistor R35 and the lower end of capacitor C22. The 2nd pin is connected to the upper end of capacitor C22 and grounded. The upper end of resistor R35 is connected to a 3.3V DC power supply. The 1st pin of key U6 is connected to the lower end of resistor R36 and the lower end of capacitor C23. The 2nd pin is connected to the upper end of capacitor C23 and grounded. The upper end of resistor R36 is connected to a 3.3V DC power supply. The 1st pin of key U7 is connected to the lower end of resistor R37 and the lower end of capacitor C24. The 2nd pin is connected to the upper end of capacitor C24 and grounded. The upper end of resistor R37 is connected to a 3.3V DC power supply. The 1st pin of key U8 is connected to the lower end of resistor R38 and the lower end of capacitor C25. The 2nd pin is connected to the upper end of capacitor C25 and grounded. The upper end of resistor R38 is connected to a 3.3V DC power supply. The 1st pin of key U9 is connected to the lower end of resistor R39 and the lower end of capacitor C26. The 2nd pin is connected to the upper end of capacitor C26 and grounded. The upper end of resistor R39 is connected to a 3.3V DC power supply. The keys are used to adjust various protection functions and parameters.

[0051] The indicator light circuit includes indicator light L1, indicator light L2, indicator light L3, resistor R46, resistor R52, and resistor R54. The right end of indicator light L1 is connected to one end of resistor R54. The right end of indicator light L2 is connected to one end of resistor R52. The right end of indicator light L3 is connected to one end of resistor R46. The left ends of the three indicator lights are all connected to a 3.3V DC power supply. The other ends of resistor R54, resistor R52, and resistor R46 are respectively the three output terminals LED1, LED2, and LED3 of the indicator light circuit.

[0052] The screen uses an OLED display screen, including a display screen, a socket J1, a fifty-third capacitor C53, a fifty-fifth capacitor C55, a sixty-first capacitor C61, and a seventy-second resistor R72. The left end of the fifty-fifth capacitor C55 is connected to the 8th pin of the socket J1, and the right end is connected to the 9th pin of the socket J1; the left end of the sixty-first capacitor C61 is connected to the 10th pin of the socket J1, and the right end is connected to the 11th pin of the socket J1; the right end of the seventy-second resistor R72 is connected to the 13th pin of the socket J1, and the left end is connected to the 3.3V DC power supply; the left end of the fifty-third capacitor C53 is grounded, and the right end is connected to the 12th pin of the socket J1. The 1st to 5th pins of the socket J1 are respectively connected to the 10th pin, 36th pin, 37th pin, 29th pin, and 30th pin of the MCU chip in the main control module, and the screen is directly inserted onto the socket J1. The screen can display the electricity consumption information and various values of the current socket.

[0053] The power supply module (see Figure 12 ) includes a TPS54202DDCR power supply chip U1, an LM1117IMPX-3.3 chip U2, a twenty-eighth resistor R28, a twenty-ninth resistor R29, a thirtieth resistor R30, a thirty-first resistor R31, and a twenty-fifth capacitor C25. The 1st pin of the TPS54202DDCR power supply chip U1 is connected in parallel with the lower end of the twenty-ninth resistor R29 and then grounded, its 5th pin is connected to the upper end of the twenty-ninth resistor R29 and the lower end of the twenty-eighth resistor R28, its 3rd pin is connected to the upper end of the twenty-eighth resistor R28 and the 12V power supply, its 4th pin is connected to the lower end of the thirtieth resistor R30 and the left end of the thirty-first resistor R31, the right end of the thirty-first resistor R31 is grounded, its 2nd pin is connected to the upper end of the thirtieth resistor R30, the lower end of the twenty-fifth capacitor C25, and the 3rd pin of the LM1117IMPX-3.3 chip U2, and its 6th pin is connected to the upper end of the twenty-fifth capacitor C25. The 2nd pin of the LM1117IMPX-3.3 chip U2 outputs a 3.3V power supply, and its 1st pin is grounded. This module uses two chips, TPS54202DDCR and LM1117IMPX-3.3, and can meet the voltage conversion requirement of converting 12V to 3.3V. The 12V input port of the TPS54202DDCR power supply chip U1 in this module is connected to the left end of the inductor L2 in the switching power supply module. The power supply module receives the 12V power supply output by the switching power supply module and outputs a 3.3V power supply. The 3.3V power supply in other modules is provided by the power supply module.

[0054] The switching power supply module (see Figure 13)It includes a switching power supply chip LS1, an inductor L2, a tantalum capacitor C19 of No. 19, and a tantalum capacitor C20 of No. 20. The switching power supply module is a separate power supply module; the positive electrode of the tantalum capacitor C19 of No. 19 is connected to the 3rd pin of the switching power supply chip LS1, and its negative electrode is connected to the 4th pin of the switching power supply chip LS1. The 5th pin of the switching power supply chip LS1 is grounded, its 6th pin is connected to the positive electrode of the tantalum capacitor C20 of No. 20, and a conducting wire is led out from the positive electrode of the tantalum capacitor C20 of No. 20 to connect to the right end of the inductor L2. The negative electrode of the tantalum capacitor C20 of No. 20 is grounded. The left end of the inductor L2 is the output terminal of the 12V power supply, and the 220V alternating current is connected to the 1st and 2nd pins of the switching power supply module to supply power to the switching power supply module.

[0055] The MOS drive module (see Figure 14 ) is driven by a MOS drive chip U4. The 1st pin and the 2nd pin of the MOS drive chip U4 are connected in parallel to form a second connection terminal, and the 3rd pin and the 4th pin are connected in parallel to form a first connection terminal. The second connection terminal and the first connection terminal give a drive control signal; the 6th pin and the 8th pin of the MOS drive chip U4 are grounded, and the 7th pin is connected to the left end of the inductor L2 of the switching power supply module. The MOS drive module requires 12V for power supply, and then uses the different high and low levels of the 5th pin of its MOS drive chip to output a control signal to drive the field effect transistor. The 5th pin of the MOS drive chip is connected to a pin header, and through this pin header, it is connected to the 14th pin of the MCU chip in the main control module.

[0056] The main current path module (see Figure 15 ) includes four groups of MOS transistor components connected in parallel and an absorption circuit; each group of MOS transistor components includes two upper and lower MOS transistor components. Each MOS transistor component is composed of a MOS transistor, a first resistor, a second resistor, and a Schottky diode. Among them, the gate of the MOS transistor in the upper MOS transistor component is connected to one end of the first resistor, one end of the second resistor, and the cathode of the Schottky diode. The other end of the first resistor is connected to the first connection terminal of a MOS drive module; the source of the upper MOS transistor, the anode of the Schottky diode, and the other end of the second resistor are connected in parallel and then connected to the second connection terminal of the above MOS drive module; the lower MOS transistor component has the same structure as the upper MOS transistor component. The lower MOS transistor component is connected to the first connection terminal and the second connection terminal of another MOS drive module. The drain of the MOS transistor in the upper MOS transistor component is connected to the live wire incoming terminal, the source of the MOS transistor in the upper MOS transistor component is connected to the source of the MOS transistor in the lower MOS transistor component, and the drain of the MOS transistor in the lower MOS transistor component is connected to the live wire outgoing terminal;

[0057] The four groups of MOS transistor components have the same structure and are connected in parallel in the same connection manner; the absorption circuit includes resistor R95 with number 95, capacitor C70 with number 70, and varistor Rp1; resistor R95 with number 95 and capacitor C70 with number 70 are connected in series and then connected in parallel with varistor Rp1, and both ends of the circuit formed after parallel connection are respectively connected to the incoming end and the outgoing end of the live wire. Each MOS transistor component is connected to a MOS drive module, and the four groups of MOS transistor components are connected to eight MOS drive modules.

[0058] For example, the upper MOS transistor of the first group of switching elements is MOS transistor QS1 with number 1, and the lower MOS transistor is MOS transistor QS5 with number 5. The gate of MOS transistor QS1 with number 1 is connected to one end of resistor R79 with number 79, resistor R80 with number 89, and the cathode of Schottky diode N1 with number 1. The other end of resistor R79 with number 79, the other end of resistor R80 with number 89, the source of MOS transistor QS1 with number 1, and the anode of Schottky diode N1 with number 1 are connected in parallel and then corresponding to the two connection terminals of a MOS drive module. The drain of MOS transistor QS1 with number 1 is connected to the incoming end of the live wire, and the sources of MOS transistor QS1 with number 1 and MOS transistor QS5 with number 5 are connected together; the gate of MOS transistor QS5 with number 5 is connected to one end of resistor R83 with number 83, resistor R84 with number 84, and the cathode of Schottky diode N1 with number 5. The other end of resistor R84 with number 84, the other end of resistor R83 with number 83, the anode of Schottky diode N1 with number 5, and the source of MOS transistor QS5 with number 5 are connected in parallel and then corresponding to the two connection terminals of another MOS drive module. The drain of MOS transistor QS5 with number 5 is connected to the outgoing end of the live wire.

[0059] The temperature detection module (see Figure 16)It includes a temperature sensor, the fifth resistor R5, the sixth resistor R6, the seventh resistor R7, the eighth resistor R8, the tenth capacitor C10, the eleventh capacitor C11, the twelfth capacitor C12, and the thirteenth capacitor C13. A temperature sensor is correspondingly connected between the 1st pin and the 2nd pin, the 3rd pin and the 4th pin, the 5th pin and the 6th pin, and the 7th pin and the 8th pin of the pin header P7. The four temperature sensors are connected to the main control module MCU chip U10 through the pin header P7. The 2nd pin, the 4th pin, the 6th pin, and the 8th pin of the pin header P7 are respectively and correspondingly connected to the 8th pin, the 25th pin, the 11th pin, and the 9th pin of the main control module MCU chip U10; the 2nd pin of the pin header P7 is connected to the lower end of the eighth resistor R8 and the upper end of the thirteenth capacitor C13, the 4th pin of the pin header P7 is connected to the lower end of the seventh resistor R7 and the upper end of the twelfth capacitor C12, the 6th pin of the pin header P7 is connected to the lower end of the sixth resistor R6 and the upper end of the eleventh capacitor C11, the 8th pin of the pin header P7 is connected to the lower end of the fifth resistor R5 and the upper end of the tenth capacitor C10. The upper ends of the above four resistors are all connected to the 3.3V DC power supply, and the lower ends of the above four capacitors are all grounded. The temperature sensor is used to monitor the temperature of the electrical appliance of the smart socket and the temperature of the live wire (L) incoming and outgoing wires in real time, so as to avoid equipment damage caused by excessive temperature.

[0060] The utility model is integrated onto a circuit PCB control board according to the connection mode of each module described above, and then installed in the socket housing for use. The circuit boards of each module of the utility model are all small in volume, and each component is arranged neatly and closely.

[0061] The main control module uses STM32F103RCT6 as the main control chip; the resistance values of the twelfth resistor (R12) and the twentieth resistor (R20) are both 10 ohms; the resistance values of the forty-fourth resistor (R44) and the forty-seventh resistor (R47) are both 510 ohms.

[0062] The current and leakage current acquisition module uses a 2000:1 current transformer; the current sampling module uses 10-ohm (1%) sampling resistors (i.e., resistor R12 and resistor R20), and both ends of the sampling resistors are respectively connected to the current differential input channels of the metering chip for metering distribution parameters such as real-time power and electric energy. Then, a 1.65V boosted current is connected, and after passing through a differential amplifier, it is connected to the ADC acquisition channel of the main control module. The main control module samples once every 312.5 μs. After accumulating 1 cycle, that is, 64 points, the real-time current value can be obtained. For leakage sampling, 510-ohm (1%) sampling resistors (i.e., resistor R44 and resistor R47) are used, and they are connected to the ADC channels of the metering module and the main control module in the same way as the current sampling circuit; for voltage acquisition, a 1:1 voltage transformer is used and connected to the metering module; the metering module is connected to the main control chip STM32F103RCT6 through USART to realize the reading and writing of data between the main control module and the metering module. The metering data and the data acquired by the ADC of the main control module are jointly used for various protections such as voltage and current. The metering chip uses the RN8209 chip.

[0063] This intelligent socket is powered by a switched-mode power supply. The 220V AC is connected to the input end of the switched-mode power supply module. Through a transformer, a switched-mode power supply chip, and peripheral circuits, the 220V AC is converted into 12V DC to power the MOS drive circuit. At the same time, a DC-DC chip of the TPS54202DDCR model and an LM1117 chip convert 12V to 3.3V to power the main control chip, the metering chip, the external storage chip, the amplifier, the Bluetooth, etc.

[0064] The Bluetooth module of this intelligent socket is connected to the main control chip STM32F103RCT6 through a communication serial port. The Bluetooth module is connected to a mobile phone within a short distance to realize short-distance data transmission, facilitating the user to obtain the power consumption situation of the electrical appliance in real time. The screen in the human-computer interaction module of this intelligent socket is mainly used to display real-time data and function menus, including voltage, current, power, electric energy, etc. The function menu is used to control the opening and closing of various protection functions, enabling the user to conveniently understand the parameters of the intelligent socket and make adaptive modifications. Its structure has a perfect communication mechanism module. Through two methods, WiFi and Bluetooth, a wireless control method is realized. The WiFi module is connected to the main control chip STM32F103RCT6 through a communication serial port. When connected to the network, it can realize real-time viewing of the power consumption information of this intelligent socket.

[0065] The working principle and process of this utility model are as follows: The real-time reading of parameters such as the intelligent socket (voltage, current, power, etc.) and device temperature is achieved through the ADC of the main control chip and the metering chip. When abnormal data is detected, the main control chip issues a command signal, and the drive circuit controls the field-effect transistor to turn off, thereby cutting off the fault current to ensure the safety of electrical equipment and personnel. At the same time, according to different loads, the on-off of the field-effect transistor can be adjusted to control the current and power in the circuit. The voltage and current acquisition module consists of a mutual inductor and a sampling circuit, which are respectively connected to the main control module and the metering module to collect data and measure parameters such as power and electric energy. The Bluetooth module and the WIFI module are connected to the main control module through the USART method. With the cooperation of the transmission protocol and the upper computer, the power consumption situation of the intelligent socket can be obtained in real time, realizing functions such as remote wireless operation, setting the protection function status, protection data parameters, and reading fault records. This intelligent socket has overload protection, short-circuit protection, leakage protection, and load identification, and also has functions such as Bluetooth and WiFi. Through this intelligent socket, the protection of electronic circuits and electrical products can be achieved, avoiding the danger of electric shock to people.

[0066] This utility model only provides the basic hardware structure design that can achieve the above functions. The control method and related control instruction design are not within the protection scope of this utility model. The above function description is only an explanation of the application scenario of the structure designed by this utility model.

[0067] Matters not described in this utility model apply to the prior art.

Claims

1. A smart socket circuit with fire prevention and current limiting function, characterized in that: The smart socket circuit is provided with a Bluetooth module, a WIFI module, a metering module, a main control module, a leakage current acquisition module, a voltage acquisition module, a current acquisition module, a power module, a switch power module, a MOS drive module, a current path module, and a temperature monitoring module. Each module is connected to the PCB board of the internal circuit board of the socket by pin welding, and the conduction between the modules is realized through the copper wire on the PCB board; The Bluetooth module includes a light emitting diode (LEDA), a resistor No. 1 (R1), a capacitor No. 29 (C29), a capacitor No. 30 (C30), and a Bluetooth chip (BLE1); a +3.3V DC power supply is connected to the positive electrode of the light emitting diode (LEDA), the negative electrode of the light emitting diode (LEDA) is connected in series with one end of the resistor No. 1 R1, and the other end of the resistor No. 1 (R1) is connected to pin No. 1 of the Bluetooth chip (BLE1); a +3.3V DC power supply is connected to the upper end of the capacitor No. 29 (C29) and the capacitor No. 30 The upper end of capacitor No. 1 (C30) is connected to pin No. 5 of the Bluetooth chip (BLE1), and the lower ends of capacitor No. 29 (C29) and capacitor No. 30 (C30) are connected to the ground; pin No. 6 of the Bluetooth chip (BLE1) is grounded; pin No. 2, pin No. 7, pin No. 10, pin No. 11, and pin No. 12 of the Bluetooth chip (BLE1) are respectively connected to pin No. 35, pin No. 34, pin No. 52, pin No. 51, and pin No. 33 of the MCU chip ((U10)) in the main control module; The WiFi module includes a No. 75 resistor (R75), a No. 76 resistor (R76), a No. 77 resistor (R77), a No. 78 resistor (R78), a No. 39 capacitor (C39), a No. 66 capacitor (C66), and a WiFi chip (U11); a 3.3V DC power supply is respectively connected to one end of the No. 76 resistor (R76), one end of the No. 75 resistor (R75), one end of the No. 39 capacitor (C39), one end of the No. 66 capacitor (C66), the No. 8 pin of the WiFi chip (U11), and one end of the No. 77 resistor (R77); the other end of the No. 75 resistor (R75) is connected to the No. 1 pin of the WiFi chip (U11). The other end of the seventy-sixth resistor (R76) is connected to the No. 2 pin of the WiFi chip (U11); the other end of the No. 39 capacitor (C39) is connected in parallel with the other end of the No. 66 capacitor (C66) and then grounded; the other end of the No. 77 resistor (R77) is connected to the No. 18 pin of the WiFi chip (U11); one end of the No. 78 resistor (R78) is connected to the No. 16 pin of the WiFi chip (U11), and the other end thereof is connected in parallel with the No. 15 pin of the WiFi chip (U11) and then grounded; the No. 21 pin and the No. 22 pin of the WiFi chip (U11) are connected to the No. 17 pin and the No. 16 pin of the main control module MCU chip ((U10)) correspondingly; The metering module includes RN8209D metering chip (U3), capacitor No. 42 (C42), capacitor No. 43 (C43), resistor No. 55 (R55), resistor No. 56 (R56), capacitor No. 44 (C44), capacitor No. 45 (C45), resistor No. 59 (R59), capacitor No. 48 (C48), capacitor No. 50 (C50), electrolytic capacitor No. 21 (C21); one end of capacitor No. 42 (C42), one end of capacitor No. 43 (C43), and capacitor No. 50 (C50). One end of the No. 5 resistor (R55) is connected in parallel to the No. 18 pin of the RN8209D metering chip (U3); the other end of the No. 55 resistor (R55), one end of the No. 44 capacitor (C44), and one end of the No. 45 capacitor (C45) are connected in parallel to the No. 1 pin of the RN8209D metering chip (U3); the other end of the No. 42 capacitor (C42), the other end of the No. 43 capacitor (C43), and one end of the No. 56 resistor (R56) are connected in parallel to GND; the No. 56 resistor (R56) ), the other end of capacitor No. 44 (C44), and the other end of capacitor No. 45 (C45) are connected in parallel and then connected to AGND; one end of resistor No. 59 (R59) is connected to a 3.3V DC power supply, the other end of resistor No. 59 (R59) is connected in parallel with one end of capacitor No. 48 (C48) and then connected to pin No. 2 of RN8209D metering chip (U3), and the other end of capacitor No. 48 (C48) is connected to AGND; one end of capacitor No. 50 (C50) is connected to electrolytic capacitor No. 21 (C21) One end of the 50th capacitor (C50) is connected in parallel to the No. 10 pin of the RN8209D metering chip (U3), the other end of the No. 21 electrolytic capacitor (C21) and the No. 12 pin of the RN8209D metering chip (U3) are connected in parallel to GND; the No. 11 pin of the RN8209D metering chip (U3) is connected to AGND; the No. 13 and No. 14 pins of the RN8209D metering chip (U3) are connected to the No. 17 and No. 16 pins of the MCU chip ((U10)) respectively; The main control module includes an MCU chip (U10), a crystal oscillator circuit, and a reset circuit; the crystal oscillator circuit is composed of a No. 36 capacitor (C36), a No. 40 capacitor (C40), a No. 2 crystal oscillator (X2), a No. 33 capacitor (C33), a No. 38 capacitor (C38), and a No. 3 crystal oscillator (X3); the No. 1 pin and the No. 2 pin of the No. 2 crystal oscillator (X2) are respectively connected to the No. 6 pin and the No. 5 pin of the MCU chip (U10); the No. 1 pin of the No. 2 crystal oscillator (X2) is also led out with a conductive wire and connected to the right end of the No. 40 capacitor (C40), the No. 2 pin of the No. 2 crystal oscillator (X2) is also led out with a conductive wire and connected to the right end of the No. 36 capacitor (C36), the left end of the No. 40 capacitor (C40) and the left end of the No. 36 capacitor (C36) are connected in parallel and then grounded; the No. 1 pin and the No. 2 pin of the No. 3 crystal oscillator (X3) are respectively connected to the No. 6 pin and the No. 5 pin of the MCU chip (U10); It should be connected to the No. 4 pin and the No. 3 pin of the MCU chip (U10); the No. 1 pin of the No. 3 crystal oscillator (X3) is also led out with a conductive wire connected to the right end of the No. 38 capacitor (C38), the No. 2 pin of the No. 3 crystal oscillator (X3) is also led out with a conductive wire connected to the right end of the No. 33 capacitor (C33), the left end of the No. 38 capacitor (C38) and the left end of the No. 33 capacitor (C33) are connected in parallel and then grounded; the reset circuit is composed of the No. 66 resistor (R66) and the No. 51 capacitor (C51), the upper end of the No. 66 resistor (R66) is connected to the +3.3V DC power supply of the power supply module, and the lower end of the No. 66 resistor (R66) is led out with two conductive wires, which are respectively connected to the No. 7 pin of the MCU chip (U10) and the upper end of the No. 51 capacitor (C51), and the lower end of the No. 51 capacitor (C51) is grounded; The leakage current collection module includes a leakage current transformer, a No. 44 resistor (R44), a No. 47 resistor (R47), and a No. 1 MCP6004-I / ST operational amplifier (IC1A); the No. 1 pin of the leakage current transformer is connected to the upper end of the No. 44 resistor (R44) and the No. 2 pin of the No. 1 MCP6004-I / ST operational amplifier (IC1A), the No. 2 pin of the leakage current transformer is connected to the lower end of the No. 47 resistor (R47) and the No. 3 pin of the No. 1 MCP6004-I / ST operational amplifier (IC1A), the lower end of the No. 44 resistor (R44) and the upper end of the No. 47 resistor (R47) are connected in parallel and then grounded; the live wire and the neutral wire pass through the magnetic core of the leakage current transformer, and the No. 1 pin of the No. 1 MCP6004-I / ST operational amplifier (IC1A) is connected to the No. 22 pin of the MCU chip (U10) in the main control module; The voltage acquisition module includes a voltage transformer, a No. 73 resistor (R73), a No. 74 resistor (R74), a No. 62 capacitor (C62), and a No. 63 capacitor (C63); the No. 1 pin of the voltage transformer, the upper end of the No. 73 resistor (R73), and the upper end of the No. 62 capacitor (C62) are connected in parallel and then connected to the No. 8 pin of the RN8209D metering chip (U3) in the metering module; the No. 2 pin of the voltage transformer, the lower end of the No. 74 resistor (R74), and the lower end of the No. 63 capacitor (C63) are connected in parallel and then connected to the No. 9 pin of the RN8209D metering chip (U3) in the metering module; the lower end of the No. 73 resistor (R73) and the upper end of the No. 74 resistor (R74) are connected in parallel and then grounded, and the lower end of the No. 62 capacitor (C62) and the upper end of the No. 63 capacitor (C63) are connected in parallel and then grounded; this module is used to collect voltage; The current acquisition module includes a current transformer, a No. 12 resistor (R12), a No. 20 resistor (R20), and a No. 2 MCP6004-I / ST operational amplifier (IC1C). The No. 1 pin of the current transformer and the upper end of the No. 12 resistor (R12) are connected to the No. 9 pin of the No. 2 MCP6004-I / ST operational amplifier (IC1C). The No. 2 pin of the leakage transformer and the lower end of the No. 20 resistor (R20) are connected to the No. 10 pin of the No. 2 MCP6004-I / ST operational amplifier (IC1C). The lower end of the No. 12 resistor (R12) and the upper end of the No. 20 resistor (R20) are connected in parallel and then grounded. The No. 8 pin of the No. 2 MCP6004-I / ST operational amplifier (IC1C) in this module is connected to the No. 56 pin of the MCU chip (U10) in the main control module. The power module includes a TPS54202DDCR power chip (U1), a LM1117IMPX-3.3 chip (U2), a No. 28 resistor (R28), a No. 29 resistor (R29), a No. 30 resistor (R30), a No. 31 resistor (R31), and a No. 25 capacitor (C25); the No. 1 pin of the TPS54202DDCR power chip (U1) is connected in parallel with the lower end of the No. 29 resistor (R29) and then grounded, the No. 5 pin thereof is connected to the upper end of the No. 29 resistor (R29) and the lower end of the No. 28 resistor (R28), the No. 3 pin thereof is connected to the upper end of the No. 28 resistor (R28) and a 12V power supply, and the No. 4 pin thereof is connected to the lower end of the No. 30 resistor (R30). The left end of the No. 31 resistor (R31) is connected to the right end of the No. 31 resistor (R31) and is grounded. Its No. 2 pin is connected to the upper end of the No. 30 resistor (R30), the lower end of the No. 25 capacitor (C25) and the No. 3 pin of the LM1117IMPX-3.3 chip (U2). Its No. 6 pin is connected to the upper end of the No. 25 capacitor (C25). The No. 2 pin of the LM1117IMPX-3.3 chip (U2) outputs a 3.3V power supply, and its No. 1 pin is grounded. The 12V input port of the TPS54202DDCR power chip (U1) is connected to the left end of the inductor (L2) in the switching power module. The power module receives the 12V power supply output by the switching power module and outputs a 3.3V power supply. The switching power supply module includes a switching power supply chip (LS1), an inductor (L2), a No. 19 tantalum capacitor (C19), and a No. 20 tantalum capacitor (C20). The switching power supply module is a separate power supply module; the positive electrode of the No. 19 tantalum capacitor (C19) is connected to the No. 3 pin of the switching power supply chip (LS1), and the negative electrode thereof is connected to the No. 4 pin of the switching power supply chip (LS1); the No. 5 pin of the switching power supply chip (LS1) is grounded, and the No. 6 pin thereof is connected to the positive electrode of the No. 20 tantalum capacitor (C20); a conductive wire is led out from the positive electrode of the No. 20 tantalum capacitor (C20) to connect to the right end of the inductor (L2), and the negative electrode of the No. 20 tantalum capacitor (C20) is grounded; the left end of the inductor (L2) is the output end of the 12V power supply, and the 220V AC power is connected to the No. 1 and No. 2 pins of the switching power supply module to supply power to the switching power supply module; The MOS driving module is driven by a MOS driving chip (U4). Pins 1 and 2 of the MOS driving chip (U4) are connected in parallel to form a second terminal, and pins 3 and 4 are connected in parallel to form a first terminal. The second terminal and the first terminal provide a driving control signal. Pins 6 and 8 of the MOS driving chip (U4) are grounded, and pin 7 is connected to the left end of the inductor (L2) of the switching power module. Pin 5 of the MOS driving chip (U4) is connected to a pin row, and is connected to pin 14 of the MCU chip (U10) in the main control module through the pin row. The current main path module includes four groups of MOS tube components connected in parallel and an absorption circuit; each group of MOS tube components includes two MOS tube components arranged on the upper and lower sides, and each MOS tube component is composed of a MOS tube, a first resistor, a second resistor, and a Schottky diode, wherein the gate of the MOS tube in the upper MOS tube component is connected to one end of the first resistor, one end of the second resistor, and the cathode of the Schottky diode, and the other end of the first resistor is connected to the first terminal of a MOS driving module; the source of the upper MOS tube, the anode of the Schottky diode, and the other end of the second resistor are connected in parallel to the second terminal of the above-mentioned MOS driving module; the structure of the lower MOS tube component is the same as that of the upper MOS tube component, the lower MOS tube component is connected to the first terminal and the second terminal of another MOS driving module, the drain of the MOS tube of the upper MOS tube component is connected to the live wire input terminal, the source of the MOS tube of the upper MOS tube component is connected to the source of the MOS tube of the lower MOS tube component, and the drain of the MOS tube of the lower MOS tube component is connected to the live wire output terminal; The four groups of MOS tube components have the same structure and are connected in parallel in the same way; the absorption circuit includes a No. 95 resistor (R95), a No. 70 capacitor (C70) and a varistor (Rp1); the No. 95 resistor (R95) and the No. 70 capacitor (C70) are connected in series and then connected in parallel with the varistor (Rp1), and the two ends of the circuit formed by the parallel connection are respectively connected to the incoming end and the outgoing end of the live wire; each MOS tube component is connected to a MOS driver module, and the four groups of MOS tube components are connected to eight MOS driver modules; The temperature detection module includes a temperature sensor, a No. 5 resistor (R5), a No. 6 resistor (R6), a No. 7 resistor (R7), a No. 8 resistor (R8), a No. 10 capacitor (C10), a No. 11 capacitor (C11), a No. 12 capacitor (C12), and a No. 13 capacitor (C13); pins 1 and 2, pins 3 and 4, pins 5 and 6, and pins 7 and 8 of the pin (P7) are each connected to a temperature sensor correspondingly, and the four temperature sensors are connected to the main control module MCU chip (U10) through the pin (P7), and pins 2, 4, 6, and 8 of the pin (P7) are respectively connected to the main control module MCU chip ( The pins 8, 25, 11 and 9 of the U10 are connected correspondingly; the pin 2 of the pin (P7) is connected to the lower end of the eighth resistor (R8) and the upper end of the thirteenth capacitor (C13), the pin 4 of the pin (P7) is connected to the lower end of the seventh resistor (R7) and the upper end of the twelfth capacitor (C12), the pin 6 of the pin (P7) is connected to the lower end of the sixth resistor (R6) and the upper end of the eleventh capacitor (C11), the pin 8 of the pin (P7) is connected to the lower end of the fifth resistor (R5) and the upper end of the tenth capacitor (C10), the upper ends of the above four resistors are connected to a 3.3V DC power supply, and the lower ends of the above four capacitors are grounded.

2. The intelligent socket circuit with fire prevention and current limiting function according to claim 1, characterized in that: The intelligent socket circuit is also provided with a human-machine interaction module; the human-machine interaction module includes five groups of key circuits, an indicator light circuit, and a screen; the output terminals Key_1, Key_2, Key_3, Key_4, and Key_5 of the five groups of key circuits are respectively connected to the 57th, 58th, 59th, 61st, and 62nd pins of the MCU chip (U10) in the main control module; the output terminals LED1, LED2, and LED3 of the indicator light circuit are respectively connected to the 50th, 53rd, and 54th pins of the MCU chip (U10) in the main control module; The structures of the five groups of key circuits are the same. The first group of key circuits is taken as an example for structural description. The first group of key circuits includes a No. 35 resistor (R35), a No. 22 capacitor (C22), and a key (U5); the No. 1 pin of the key (U5), the lower end of the No. 35 resistor (R35), and the lower end of the No. 22 capacitor (C22) are connected in parallel to form the output terminal Key_1 of the first group of key circuits, the No. 2 pin of the key (U5) is connected to the upper end of the No. 22 capacitor (C22) and grounded, and the upper end of the No. 35 resistor (R35) is connected to a 3.3V DC power supply; The indicator light circuit comprises an indicator light No. 1 (L1), an indicator light No. 2 (L2), an indicator light No. 3 (L3), a resistor No. 46 (R46), a resistor No. 52 (R52), and a resistor No. 54 (R54); the right end of the indicator light No. 1 (L1) is connected to one end of the resistor No. 54 (R54), the right end of the indicator light No. 2 (L2) is connected to one end of the resistor No. 52 (R52), the right end of the indicator light No. 3 (L3) is connected to one end of the resistor No. 46 (R46), the left ends of the three indicator lights are all connected to a 3.3V DC power supply, and the other end of the resistor No. 54 (R54), the other end of the resistor No. 52 (R52), and the other end of the resistor No. 46 (R46) correspond to the three output ends LED1, LED2, and LED3 of the indicator light circuit respectively; The screen uses an OLED display screen, including a display screen, a plug board (J1), a capacitor No. 53 (C53), a capacitor No. 55 (C55), a capacitor No. 61 (C61), and a resistor No. 72 (R72); the left end of the capacitor No. 55 (C55) is connected to the pin No. 8 of the plug board (J1), and the right end is connected to the pin No. 9 of the plug board (J1); the left end of the capacitor No. 61 (C61) is connected to the pin No. 10 of the plug board (J1), and the right end is connected to the plug board (J1) The right end of resistor No. 72 (R72) is connected to pin No. 13 of the plug board (J1), and the left end is connected to a 3.3V DC power supply; the left end of capacitor No. 53 (C53) is grounded, and the right end is connected to pin No. 12 of the plug board (J1); pins No. 1 to No. 5 of the plug board (J1) are respectively connected to pins No. 10, No. 36, No. 37, No. 29 and No. 30 of the MCU chip in the main control module, and the screen is directly inserted into the plug board (J1).

3. The intelligent socket circuit with fire prevention and current limiting function according to claim 1, characterized in that: The MCU chip (U10) in the main control module is the STM32F103RCT6 chip.

4. The intelligent socket circuit with fire prevention and current limiting function according to claim 1, characterized in that: The leakage transformer and current transformer are both 2000:1 current transformers.

5. The intelligent socket circuit with fire prevention and current limiting function according to claim 1, characterized in that: The voltage transformer uses a 1:1 voltage transformer.

6. The intelligent socket circuit with fire prevention and current limiting function according to claim 1, characterized in that: The resistance values ​​of resistor No. 12 (R12) and resistor No. 20 (R20) are both 10 ohms.

7. The intelligent socket circuit with fire prevention and current limiting function according to claim 1, characterized in that: The resistance values ​​of resistor No. 44 (R44) and resistor No. 47 (R47) are both 510 ohms.

Images