Safe intelligent socket circuit with electric arc identification and current identification

Abstract

The utility model discloses a safe intelligent socket circuit with electric arc identification and current identification, comprising a power conversion circuit, an electric arc detection MCU circuit, an electric arc detection circuit, an electric energy metering MCU circuit, a current identification circuit with a relay control circuit, and an intelligent socket application circuit providing electric arc identification and current identification with relay control. The intelligent socket integrates electric arc identification detection and current identification detection technologies, and when an electric arc or current overload condition on a line is detected, the intelligent socket can automatically control the relay and close the output of a subsequent circuit, so that the electric arc or current overload condition is ensured. According to the intelligent socket, the occurrence of arc and current overload conditions on a line can be accurately identified, meanwhile, the threshold value of the maximum current can be freely set, and when the arc and the current of the line exceed the threshold value of the large current, the intelligent socket can actively close the output of the relay, so that electric shock caused by the arc and current overload and fire caused by electric appliances are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of circuits, in particular to a safe intelligent socket circuit with arc recognition and current recognition. Background Art

[0002] The field of smart socket technology encompasses multiple aspects, including hardware design, software implementation, communications, energy management, and safety protection. The continuous development of smart socket technology not only enhances the intelligence and comfort of home living but also supports the implementation of smart energy management for families, communities, and even cities. While smart sockets offer numerous conveniences, they also have drawbacks. These include stability issues: Some smart sockets may be designed without extensive experience in large-scale manufacturing, electrical appliances, and personal products, leading to concerns about their safety and stability. Operational complexity: Smart socket control may be overly reliant on apps, resulting in poor user experience and requiring multiple steps on a phone to turn appliances on and off. Safety concerns: With the increasing use of electrical appliances in homes, safety measures are increasingly required to prevent catastrophic electrical events, such as harmful electric shock or fire. These events are caused by arcing or leakage. When faults occur in wiring or electrical connectors, high-voltage circuits can generate arcs. Furthermore, when electrical appliances draw excessive current, cables can age easily. Long-term overheating can degrade the insulation and reduce the lifespan of wires. Furthermore, excessive current can cause safety hazards such as short circuits and fires. Therefore, it is necessary to design a safe intelligent socket circuit with arc recognition and current recognition to solve the problem. Utility Model Content

[0003] The utility model proposes a safe intelligent socket circuit with arc recognition and current recognition, which is characterized in that: the circuit consists of five parts, including a power conversion circuit, an arc detection MCU circuit, an arc detection circuit, an electric energy metering MCU circuit, and a current recognition circuit with a relay control circuit, providing an intelligent socket application circuit with arc recognition and current recognition and relay control, integrating arc recognition detection and current recognition detection technologies. When an arc or current overload is detected on the line, the intelligent socket will automatically control the relay to shut down the output of the subsequent circuit, thereby ensuring that the safety hazards of wire short circuit and electrical fire caused by arc or current overload are avoided.

[0004] Furthermore, the power conversion circuit converts the AC power into the DC power required by the subsequent circuit through voltage conversion, and provides the working voltage for the subsequent chips, etc. The first part of the circuit is the 220V input between the neutral and live wires, which is rectified and stepped down to a 12V output of DC power. The neutral and live wires of the AC input are connected to the fuse F1, differential mode inductors L3, L4, LDM, plug-in resistor R1, common mode inductor T2, varistor MOV1, safety X capacitor CX1, thermistor NTC1, chip resistors R33 and R34, which are combined into EMS protection and EMI filtering circuits, and then connected to pins 1 and 2 of the AC-DC module power supply U1. The aluminum electrolytic capacitor C1 is the input filter electrolytic capacitor of the AC-DC module power supply U1, which is a large filter capacitor in the EMC filter. The AC-DC module power supply U1 is a Jinshengyang AC-DC module, model LS15-23B12DR3, AC-DC Pins 5 and 6 of the module power supply U1 output a DC voltage of 12V. Aluminum electrolytic capacitors CE2 and CE3, differential mode inductor L1, transient diode TVS1, and chip capacitor C4 form an output filtering and protection circuit to provide a stable and reliable operating voltage for subsequent chips.

[0005] The second part is the DC 12V step-down circuit to DC 5V. The DC 12V input is connected to the chip capacitors C19, C20, and C21, and then sent to the 5-pin input pin of the DC-DC chip U6 after filtering. The model of the DC-DC chip U6 is SY8113B, and the chip resistors R36 and R37 provide the enable working voltage for the chip U6. The output end chip capacitor C22 and the chip resistors R38 and R39 provide output feedback to U6 to ensure a stable output voltage of 5V. The chip power inductor L6, the plug-in aluminum electrolytic capacitor CE1, and the chip diode D9 together form the output filter circuit.

[0006] The third part is the DC 5V step-down circuit to DC 3.3V. The DC 5V input is connected to the chip capacitor C3, and after filtering, it is sent to the 2-pin input pin of the LDO chip VR1. The LDO chip model is H7533-1. Then the 3-pin of VR1 is connected to the chip capacitor C2 for filtering and outputting a stable 3.3V.

[0007] Furthermore, the arc detection MCU circuit receives data from the arc detection circuit and the leakage detection circuit, then amplifies the data through the operational amplifier of the peripheral circuit and sends it to the high-frequency gain programmable amplifier (PGA), high-speed comparator and hardware acceleration coprocessor of the arc detection MCU. The arc signal and leakage signal are input to the arc detection MCU through the two-stage operational amplifier peripheral circuit;

[0008] The first-stage operational amplifier peripheral circuit consists of chip resistors R1, R9, R11, chip transistor Q1, chip inductor L2, and chip capacitors C6, C8, and C9;

[0009] The second-stage op amp peripheral circuit is composed of chip resistors R3, R4, R5, R6, R7, R8, R10, R12, R13, R20, R25, R26, and chip capacitors C7, C10, C15, C18, and C23; and the chip capacitors C11, C12, C13, C14, and C25 of the peripheral circuit are power filter capacitors for the arc detection MCU, providing a constant voltage input for the chip.

[0010] Furthermore, the integrated circuit U2 is an arc detection MCU, model FM2208_QFN64,

[0011] Furthermore, the arc detection circuit consists of two circuits: a current monitoring circuit and a voltage monitoring circuit. The current monitoring circuit consists of chip resistors R14, R15, and R16, a chip capacitor C24, and a leakage transformer interface P1; the voltage monitoring circuit consists of chip resistors R21, R22, R23, R24, R27, and R28, a chip capacitor C26, a varistor RV1, and a neutral and live wire interface P2.

[0012] Furthermore, the leakage transformer interface P1 mainly utilizes a high-frequency leakage transformer, which is connected to the live wire to measure the current changes on the line and transmit the current data to the arc detection MCU. The neutral-live wire interface P2 is connected to the neutral-live wire to measure the voltage changes of the neutral-live wire on the line and transmit the voltage data to the arc detection MCU.

[0013] Furthermore, the electric energy metering MCU circuit receives the current identification circuit and controls the relay circuit, then inputs the current data to the electric energy metering MCU through the peripheral circuit, and then uses the specific algorithm inside the chip for processing to identify whether there is a current value in the power line, and then controls the on and off of the relay according to the magnitude of the current value. The current data signal is input into the chip through the 26th and 27th pins of U4 for calculation; then the on and off of the relay is controlled through the 17th pin; the integrated circuit U4 communicates data with the arc detection MCU through the 12th and 13th pins; the chip capacitors C34, C35, C36, and C37 are power filter capacitors of the electric energy metering MCU, which provide a constant voltage input for the chip; the chip resistor R46 and the chip capacitor C41 provide a reset signal to the electric energy metering MCU to allow the chip to work normally.

[0014] Furthermore, the integrated circuit U4 is an electric energy metering MCU, model BL0906.

[0015] Furthermore, the current identification circuit with relay control circuit consists of two circuits, a relay control circuit and a current identification detection circuit. The relay control circuit is composed of chip resistors R40, R41, R43, R45, chip light-emitting diode D2, chip diode D3, chip transistor Q2, and power relay K1. The integrated circuit U4 controls the M1 network to close the power relay K1, so that interface P4 and interface P3 form a path output. The current identification detection circuit is composed of chip alloy resistor R42, chip resistors R35 and R44, chip capacitors C38 and C40, and chip dual diodes D4 and D5. When the power relay K1 is closed and interface P4 and interface P3 form a path, current will flow through the alloy resistor R42. By measuring the voltage value at both ends of the alloy resistor R42, it is input into the electric energy metering MCU for calculation to measure the current value passing through the line.

[0016] Compared with the existing technology, the beneficial effects of the present invention are as follows: the circuit itself uses two different technical means, arc identification and current identification, to identify and prevent fault arcs and excessive current in power lines. By utilizing the technology in the hardware of this circuit, plus a simple implementation method, and a specific algorithm provided inside the chip, this circuit can be applied to power lines to accurately identify the occurrence of arcs and current overloads on the lines. At the same time, the maximum current threshold can be freely set. When an arc occurs in the line and the current exceeds the high current threshold, the smart socket will actively turn off the relay output to protect against electric shocks caused by arcs and current overloads and fires caused by electrical appliances, such as poor wire contact, battery charging, etc., while ensuring the safe operation of the power system and safety protection against arcs and current overloads on the lines in daily life. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the overall block diagram of the intelligent socket circuit of the utility model;

[0018] Figure 2 This is a schematic diagram of the power conversion circuit of the utility model;

[0019] Figure 3 This is the circuit principle diagram of the arc detection MCU of the utility model;

[0020] Figure 4 The utility model relates to an arc detection circuit.

[0021] Figure 5 The utility model relates to an electric energy metering MCU circuit.

[0022] Figure 6 The utility model relates to a current identification circuit with a relay control circuit. DETAILED DESCRIPTION

[0023] In order to deepen the understanding of the present invention, the present invention will be further described in detail with reference to the following examples. These examples are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention. Figure 1-6 The circuit is characterized by comprising five parts: a power conversion circuit, an arc detection MCU circuit, an arc detection circuit, an energy metering MCU circuit, and a current identification circuit with a relay control circuit. This circuit provides an application circuit for an arc identification and current identification smart socket with relay control, integrating arc identification detection and current identification detection technologies. When an arc or current overload is detected on a circuit, the smart socket automatically controls the relay to shut down the output of subsequent circuits, thereby preventing safety hazards such as short circuits and electrical fires caused by arcs or current overloads.

[0024] The preferred technical solution is that the power conversion circuit converts AC power into DC power required by the subsequent circuit through voltage conversion, and provides working voltage for the subsequent chips, etc. The first part of the circuit is the 220V input between the neutral and live wires, which is rectified and stepped down to a 12V DC output. The neutral and live wires of the AC input are connected to the fuse F1, differential mode inductors L3, L4, LDM, plug-in resistor R1, common mode inductor T2, varistor MOV1, safety X capacitor CX1, thermistor NTC1, chip resistors R33 and R34, which are combined into EMS protection and EMI filtering circuits, and then connected to pins 1 and 2 of the AC-DC module power supply U1. The aluminum electrolytic capacitor C1 is the input filter electrolytic capacitor of the AC-DC module power supply U1, which is a large filter capacitor in the EMC filter. The AC-DC module power supply U1 is a Jinshengyang AC-DC module, model LS15-23B12DR3, AC-DC Pins 5 and 6 of the module power supply U1 output a DC voltage of 12V. Aluminum electrolytic capacitors CE2 and CE3, differential mode inductor L1, transient diode TVS1, and chip capacitor C4 form an output filtering and protection circuit to provide a stable and reliable operating voltage for subsequent chips.

[0025] The second part is the DC 12V step-down circuit to DC 5V. The DC 12V input is connected to the chip capacitors C19, C20, and C21, and then sent to the 5-pin input pin of the DC-DC chip U6 after filtering. The model of the DC-DC chip U6 is SY8113B, and the chip resistors R36 and R37 provide the enable working voltage for the chip U6. The output end chip capacitor C22 and the chip resistors R38 and R39 provide output feedback to U6 to ensure a stable output voltage of 5V. The chip power inductor L6, the plug-in aluminum electrolytic capacitor CE1, and the chip diode D9 together form the output filter circuit.

[0026] The third part is the DC 5V step-down circuit to DC 3.3V. The DC 5V input is connected to the chip capacitor C3, and after filtering, it is sent to the 2-pin input pin of the LDO chip VR1. The LDO chip model is H7533-1. Then the 3-pin of VR1 is connected to the chip capacitor C2 for filtering and outputting a stable 3.3V.

[0027] In a preferred technical solution, the arc detection MCU circuit receives data from the arc detection circuit and the leakage detection circuit, then amplifies the data through the operational amplifier of the peripheral circuit and sends it to the high-frequency gain programmable amplifier (PGA), high-speed comparator and hardware acceleration coprocessor of the arc detection MCU. The arc signal and leakage signal are input to the arc detection MCU through the two-stage operational amplifier peripheral circuit;

[0028] The first-stage operational amplifier peripheral circuit consists of chip resistors R1, R9, R11, chip transistor Q1, chip inductor L2, and chip capacitors C6, C8, and C9;

[0029] The second-stage op amp peripheral circuit is composed of chip resistors R3, R4, R5, R6, R7, R8, R10, R12, R13, R20, R25, R26, and chip capacitors C7, C10, C15, C18, and C23; and the chip capacitors C11, C12, C13, C14, and C25 of the peripheral circuit are power filter capacitors for the arc detection MCU, providing a constant voltage input for the chip.

[0030] The preferred technical solution is that the integrated circuit U2 is an arc detection MCU, model FM2208_QFN64,

[0031] In a preferred technical solution, the arc detection circuit consists of two circuits: a current monitoring circuit and a voltage monitoring circuit. The current monitoring circuit consists of chip resistors R14, R15, and R16, a chip capacitor C24, and a leakage transformer interface P1; the voltage monitoring circuit consists of chip resistors R21, R22, R23, R24, R27, and R28, a chip capacitor C26, a varistor RV1, and a neutral and live wire interface P2.

[0032] The preferred technical solution is that the leakage transformer interface P1 mainly utilizes a high-frequency leakage transformer, which is connected to the live wire, measures the current changes on the line, and transmits the current data to the arc detection MCU. The neutral-live wire interface P2 is connected to the neutral-live wire, measures the voltage changes of the neutral-live wire on the line, and transmits the voltage data to the arc detection MCU.

[0033] The preferred technical solution is that the electric energy metering MCU circuit receives the current identification circuit and controls the relay circuit, then inputs the current data to the electric energy metering MCU through the peripheral circuit, and then uses the specific algorithm inside the chip for processing to identify whether there is a current value in the power line, and then controls the on and off of the relay according to the magnitude of the current value. The current data signal is input into the chip through the 26th and 27th pins of U4 for calculation; then the on and off of the relay is controlled through the 17th pin; the integrated circuit U4 communicates data with the arc detection MCU through the 12th and 13th pins; the chip capacitors C34, C35, C36, and C37 are power filter capacitors of the electric energy metering MCU, providing a constant voltage input for the chip; the chip resistor R46 and the chip capacitor C41 provide a reset signal to the electric energy metering MCU to allow the chip to work normally.

[0034] In a preferred technical solution, the integrated circuit U4 is an electric energy metering MCU, model BL0906.

[0035] The preferred technical solution is that the current identification circuit with a relay control circuit consists of two circuits, a relay control circuit and a current identification detection circuit. The relay control circuit is composed of chip resistors R40, R41, R43, R45, a chip light-emitting diode D2, a chip diode D3, a chip transistor Q2, and a power relay K1. The integrated circuit U4 controls the M1 network to close the power relay K1, so that the interface P4 and the interface P3 form a path output. The current identification detection circuit is composed of a chip alloy resistor R42, a chip resistor R35, R44, a chip capacitor C38, C40, and a chip dual diode D4, D5. When the power relay K1 is closed and the interface P4 and the interface P3 form a path, the current will flow through the alloy resistor R42. By measuring the voltage value at both ends of the alloy resistor R42, it is input into the electric energy metering MCU for calculation to measure the current value passing through the line.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0038] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

Claims

1. A safe intelligent socket circuit with arc recognition and current recognition, characterized by: The circuit consists of five parts, including a power conversion circuit, an arc detection MCU circuit, an arc detection circuit, an energy metering MCU circuit, and a current identification circuit with a relay control circuit. It provides an intelligent socket application circuit with arc identification and current identification and relay control. It integrates arc identification detection and current identification detection technologies. When an arc or current overload is detected on the line, the intelligent socket will automatically control the relay and shut down the output of subsequent circuits to ensure that safety hazards such as short circuits and fires in electrical appliances caused by arcs or current overloads are avoided.

2. The safe intelligent socket circuit with arc recognition and current recognition according to claim 1, characterized in that: The power conversion circuit converts AC power into DC power required by the subsequent circuit through voltage conversion, and provides operating voltage for the subsequent chip. The first part of the circuit is the 220V input between the neutral and live wires, which is then rectified and stepped down to a 12V DC output. The neutral and live wires of the AC input are connected to the fuse F1, differential mode inductors L3, L4, LDM, plug-in resistor R1, common mode inductor T2, varistor MOV1, safety X capacitor CX1, thermistor NTC1, and chip resistors R33 and R34, which are combined into an EMS protection and EMI filtering circuit and then connected to pins 1 and 2 of the AC-DC module power supply U1. The aluminum electrolytic capacitor C1 is the input filter electrolytic capacitor of the AC-DC module power supply U1 and is a large filter capacitor in the EMC filter. The AC-DC module power supply U1 is a Golden Sun AC-DC module, model LS15-23B12DR3, AC-DC Pins 5 and 6 of the module power supply U1 output a DC voltage of 12V. Aluminum electrolytic capacitors CE2 and CE3, differential mode inductor L1, transient diode TVS1, and chip capacitor C4 form an output filtering and protection circuit to provide a stable and reliable operating voltage for the subsequent chips. The second part is the DC 12V step-down circuit to DC 5V. The DC 12V input is connected to the chip capacitors C19, C20, and C21, and then sent to the 5-pin input pin of the DC-DC chip U6 after filtering. The model of the DC-DC chip U6 is SY8113B, and the chip resistors R36 and R37 provide the enable working voltage for the chip U6. The output end chip capacitor C22 and the chip resistors R38 and R39 provide output feedback to U6 to ensure a stable output voltage of 5V. The chip power inductor L6, the plug-in aluminum electrolytic capacitor CE1, and the chip diode D9 together form the output filter circuit. The third part is the DC 5V step-down circuit to DC 3.3V. The DC 5V input is connected to the chip capacitor C3, and after filtering, it is sent to the 2-pin input pin of the LDO chip VR1. The LDO chip model is H7533-1. Then the 3-pin of VR1 is connected to the chip capacitor C2 for filtering and outputting a stable 3.3V.

3. The safe intelligent socket circuit with arc recognition and current recognition according to claim 1, characterized in that: The arc detection MCU circuit receives data from the arc detection circuit and the leakage detection circuit, then amplifies the data through the operational amplifier of the peripheral circuit and sends it to the high-frequency gain programmable amplifier (PGA), high-speed comparator and hardware acceleration coprocessor of the arc detection MCU. The arc signal and leakage signal are input to the arc detection MCU through the two-stage operational amplifier peripheral circuit; The first-stage operational amplifier peripheral circuit consists of chip resistors R1, R9, R11, chip transistor Q1, chip inductor L2, and chip capacitors C6, C8, and C9; The second-stage op amp peripheral circuit is composed of chip resistors R3, R4, R5, R6, R7, R8, R10, R12, R13, R20, R25, R26, and chip capacitors C7, C10, C15, C18, and C23; and the chip capacitors C11, C12, C13, C14, and C25 of the peripheral circuit are power filter capacitors for the arc detection MCU, providing a constant voltage input for the chip.

4. The safe intelligent socket circuit with arc recognition and current recognition according to claim 3, characterized in that: Integrated circuit U2 is an arc detection MCU, model FM2208_QFN64.

5. The safe intelligent socket circuit with arc recognition and current recognition according to claim 3, characterized in that: The arc detection circuit consists of two parts, a current monitoring circuit and a voltage monitoring circuit; the current monitoring circuit consists of chip resistors R14, R15, R16, a chip capacitor C24, and a leakage transformer interface P1; the voltage monitoring circuit consists of chip resistors R21, R22, R23, R24, R27, R28, a chip capacitor C26, a varistor RV1, and a neutral wire interface P2.

6. The safe intelligent socket circuit with arc recognition and current recognition according to claim 5, characterized in that: The leakage transformer interface P1 mainly utilizes a high-frequency leakage transformer, which is connected to the live wire to measure the current changes on the line and transmit the current data to the arc detection MCU. The neutral-live wire interface P2 is connected to the neutral-live wire, measures the voltage changes of the neutral-live wire on the line, and transmits the voltage data to the arc detection MCU.

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