Self-power-taking zero crossing point remote switching control device and method

Abstract

The invention relates to a self-power-taking zero-crossing-point remote switching control device and method. The device comprises a current sampling unit, an induction power taking unit, a waveform sampling unit, a core control unit, a remote communication unit and an action control unit. The induction power taking unit is used for inducing current from the alternating current circuit and supplying power to the device; the current sampling unit is used for monitoring the working current; the waveform sampling unit is used for carrying out voltage waveform sampling on an input circuit and carrying out zero crossing point judgment; the action control unit is used for controlling the device to enter and exit; the core control unit is used for monitoring, calculating and judging according to the current signal of the current sampling unit; and the remote communication unit can remotely control commissioning and quitting. The installation design of the device is simplified, the device is connected to a CT of a power utilization place through a self-power-taking circuit, current can be induced from a high-voltage power transmission line, the device is switched on and off at a zero crossing point, and the influence on a high-voltage power transmission main loop is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of electricity monitoring, and in particular relates to a zero-crossing remote switching control device and method for self-powered electricity. Background Art

[0002] Currently, local power consumption monitoring in scenarios such as industrial parks, households, and smart office buildings generally relies on independent monitoring devices. These devices must be directly connected to the main power supply circuit for electrical connection. This intrusive access method has significant drawbacks:

[0003] First, there are safety and stability risks. The high current environment of the high-voltage main circuit can cause continuous electrical stress shocks to the electronic components of the monitoring device, leading to increased measurement errors, accelerated component aging, and even insulation breakdown accidents. Second, installation is relatively complicated. The space in the terminal distribution box is limited, and installation requires modification of the existing wiring. This is not only costly but also has the potential for miswiring and malfunction of protection devices.

[0004] Therefore, there is an urgent need for an electricity consumption monitoring device that can solve the above problems. Summary of the Invention

[0005] The technical problem to be solved by this invention is to provide a remotely operated, self-powered switching device that overcomes the shortcomings of the prior art by providing a self-powered, zero-crossing remote switching control device and method. This invention simplifies the device's installation design. Through a self-powered circuit, connected to a CT at the power consumption site, it can sense current from the high-voltage transmission line. The device switches on and off at zero-crossing points, minimizing the impact on the high-voltage transmission main circuit. The invention also features a communication module that can connect to a router for remote data transmission or transmit data to a mobile phone app, enabling real-time data transmission and action control.

[0006] The technical solution adopted by the present invention to solve the problems existing in the prior art is:

[0007] A self-powered zero-crossing remote switching control device comprises an inductive power supply unit, a current sampling unit, a waveform sampling unit, an action control unit, a core control unit and a remote communication unit;

[0008] The inductive power supply unit is used to sense current from the AC circuit and convert it into DC voltage after voltage stabilization and filtering to power the device;

[0009] The current sampling unit is used to monitor the working current and transmit the working current information to the core control unit;

[0010] The waveform sampling unit is used to sample the voltage waveform of the input circuit and perform zero-crossing judgment;

[0011] The action control unit is used to receive instructions from the core control unit and control the device to be deployed and retracted;

[0012] The core control unit is used to monitor, calculate and judge based on the current signal of the current sampling unit, and when the current exceeds the threshold, it sends an activation / deactivation instruction to the action control unit through the single chip microcomputer;

[0013] The remote communication unit is used to transmit data with the core control unit and can be used for remote control of deployment.

[0014] Preferably, the inductive power supply unit is specifically:

[0015] The VCC1 power supply terminal is connected to resistor R10 and then to the VCC2 power supply terminal, and is divided into two branches. One branch is connected to the ground terminal through capacitor C16, and the other branch is connected to the anode of Schmitt trigger U4. Capacitor C16 is connected in parallel with resistor R12. One branch of the 3.3V power supply terminal is connected to the ground terminal through capacitor C33, and the other branch is connected to the cathode of Schmitt trigger U4. One branch of the 3.3V power supply terminal is connected to the ground terminal through capacitor C14, and the other branch is connected to the positive power supply terminal V+ of Schmitt trigger U4. The negative power supply terminal V- of Schmitt trigger U4 is connected to the ground terminal.

[0016] The output end of the Schmitt trigger U4 is connected to the gate port 4 of the N-MOS tube Q2 through the resistor R8, and is connected to the ground end through the resistor R14; the source ports 1, 2, and 3 of the N-MOS tube Q2 are connected and connected to the ground end, and the drain ports 5, 6, 7, and 8 of the N-MOS tube Q2 are connected and connected to the VIN power supply end; one branch of the Vin power supply end is connected to the ground end through the TVS1 diode, and the other branch is connected to the Schottky diode VD5 and then divided into one branch and led to the VCC1 power supply end, and the other branch is connected to the ground end through the diode D1. The capacitor C36 is connected to the diode D1 and connected to the ground end. The VCC1 power supply end is connected to the input end VIN of the linear stabilizer V1, the output end VOUT of the linear stabilizer V1 is connected to the 3.3V power supply end and connected to the ground end through the capacitor C9, and the ground end GND of the linear stabilizer V1 is connected to the circuit ground end.

[0017] Preferably, the remote communication unit includes a Lora module, a WIFI module and a Bluetooth module. The remote communication unit is connected to the core control unit, and data is transmitted with the mobile terminal through the remote communication unit to receive control instructions from the mobile terminal.

[0018] Preferably, the action control unit is specifically:

[0019] The VCC1 power supply end is connected to the resistor R44 and the resistor R21 respectively. The other end of the resistor R21 is divided into two branches. One branch is connected to the ground end through the capacitor CE2, and the other branch is connected to the other end of the resistor R44, the cathode of the diode VD3 and the positive electrode No. 1 port of the relay control end. The negative electrode No. 2 port of the relay KBZ1 control end is connected to the positive electrode of the diode VD3. The other branch of the negative electrode No. 2 port of the relay KBZ1 control end is connected to the collector of the transistor Q1.

[0020] The output pin of the microcontroller of the core control unit is connected to the resistor R22 and then divided into two branches, one of which is connected to the ground terminal through the resistor R25, and the other is connected to the base of the transistor Q1. The resistor R25 is also connected in parallel with the capacitor C41.

[0021] Preferably, the waveform sampling unit is specifically:

[0022] The main circuit voltage LN is connected to the IN port of the zero-crossing detection chip U1 through the resistor R11. The VDD port of the zero-crossing detection chip U1 is connected to the resistor R9 and further connected to the anode port 1 of the optocoupler D2. The cathode port 2 of the optocoupler D2 is connected to the VDD port of the zero-crossing detection chip U1. The anode port 1 of the optocoupler D2 is also connected to the capacitor C5 and connected to the VSS port of the zero-crossing detection chip U1.

[0023] The collector port 4 of the optocoupler D2 is divided into three branches, one is connected to the 3.3V power supply end through the resistor R7, one is connected to the ground end through the capacitor C4, and one is connected to the microcontroller input pin of the core control unit; the emitter port 3 of the optocoupler D2 is connected to the ground end.

[0024] Preferably, the inductive power supply unit is connected to the snap-on CT for self-power supply, and the inductive power supply unit is connected to the action control unit, the current sampling unit, the core control unit, the remote communication unit and the waveform sampling unit for power supply.

[0025] Preferably, the current sampling unit and the waveform sampling unit are electrically connected to the input end of the core control unit for information collection, the output port of the core control unit is connected to the action control unit to realize the on / off operation through the control relay, and the remote communication unit is connected to the core control unit for data transmission.

[0026] A method for remote switching control of a self-generated power supply at a zero-crossing point is applied to the aforementioned remote switching control device for a self-generated power supply at a zero-crossing point, and the specific steps are as follows:

[0027] S1.1. Set the current and voltage safety threshold parameters for the device through the mobile terminal. If the parameter setting is successful, jump to S2.1, otherwise jump to S1.2;

[0028] S1.2. If it detects that the wireless communication is not connected, the device automatically switches to the local threshold protection mode and performs the zero-crossing operation according to the preset safety parameters;

[0029] S2.1: The device uses the snap-on CT and inductive power supply unit to collect power and real-time data. If the power supply is successful, it jumps to S3; otherwise, it jumps to S2.2.

[0030] S2.2: When the power supply voltage is detected to be lower than the operating threshold, the backup circuit is automatically activated to maintain the operation of key monitoring functions and send a low-battery alarm;

[0031] S3, transmitting the digital signal to the controller of the remote communication unit through the digital signal conversion unit of the current sampling unit;

[0032] S4, the controller processor makes a judgment based on the preset parameters;

[0033] S4.1: When the current is detected to exceed the "safety threshold range", the switch automatically triggers the switch-on / off operation when the AC signal crosses zero, and jumps to S5. When the automatic switch-on / off operation fails, it jumps to S4.2.

[0034] S4.2. If the automatic switching operation fails, the current and voltage data are continuously monitored and an alarm signal is sent to the remote monitoring platform via the wireless communication module. If the wireless communication module is not connected, the process goes to step S4.3.

[0035] S4.3. If it is detected that the wireless communication is not connected, the device automatically switches to the local threshold protection mode, performs the zero-crossing operation according to the preset safety parameters, and executes S5;

[0036] S5. After the activation / deactivation operation is successfully executed, the protection duration will start to be counted. When the protection duration reaches the "maximum protection duration 5-10s", the process will jump to S5.2. Otherwise, the process will jump to S5.1.

[0037] S5.1, the controller first performs a protection action, cutting off the power supply circuit at the zero crossing point, and automatically restores power supply at the next zero crossing point after the fault is eliminated;

[0038] s5.2. When the protection duration reaches the "maximum protection duration 5 to 10 seconds", the power is forced to remain in the off state and the secondary protection alarm is triggered.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] This device significantly improves the safety and reliability of power monitoring. It uses self-powered technology to directly connect to existing devices at the power consumption site to obtain operating power, completely avoiding access to the high-voltage transmission main circuit and fundamentally ensuring the safe operation of the main line in the event of a device failure. It uses zero-point switching technology to precisely execute switching actions at the zero-crossing point of the AC signal, effectively suppressing overvoltage and significantly reducing electromagnetic interference to the main circuit. This design also reduces mechanical stress on the contacts, significantly extending the mechanical life of the device and enhancing operational stability, achieving zero-intrusive intelligent control of the main circuit.

[0041] This device establishes an efficient, integrated closed-loop system for electricity management. A built-in current and voltage safety threshold module monitors electricity parameters in real time, automatically triggering power-on and power-off actions when the limit is exceeded, significantly improving response speed. It supports a dual-mode architecture that allows for both remote communication via a router and local control via Bluetooth via a mobile app, enabling remote data transmission and real-time device control. By integrating electrical parameter monitoring, protection logic, and communication functions, it eliminates the need for separate meter configuration or access to the State Grid platform, significantly reducing user deployment costs and providing flexible and reliable power safety assurance for scenarios such as smart homes and the Industrial Internet of Things. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The present invention will be further described below with reference to the accompanying drawings and examples.

[0043] Figure 1 This is a schematic diagram of the module architecture of a zero-crossing remote switching control device for self-powered electricity of the present invention.

[0044] Figure 2 This is a control flow chart of a zero-crossing remote switching control method for self-powered electricity of the present invention.

[0045] Figure 3 This is a circuit diagram of the induction power supply unit of a zero-crossing remote switching control device for self-powered electricity of the present invention.

[0046] Figure 4 This is a circuit diagram of a waveform sampling unit of a zero-crossing remote switching control device for self-powered electricity supply according to the present invention.

[0047] Figure 5 This is a waveform sampling unit input and output relationship diagram of a zero-crossing remote switching control device for self-powered electricity of the present invention.

[0048] Figure 6 This is a circuit diagram of the action control unit of a zero-crossing remote switching control device for self-powered electricity of the present invention.

[0049] Figure 7 This is a circuit diagram of a current sampling unit of a zero-crossing remote switching control device for self-powered electricity supply according to the present invention.

[0050] Figure 8This is a circuit diagram of the core control unit of a zero-crossing remote switching control device for self-powered electricity of the present invention.

[0051] Figure 9 This is a schematic diagram of the power supply architecture of a zero-crossing remote switching control device for self-powered electricity of the present invention.

[0052] Figure 10 This is a rectifier circuit diagram of a zero-crossing remote switching control device for self-powered electricity of the present invention.

[0053] Figure 11 This is a circuit diagram of the wireless communication unit of a zero-crossing remote switching control device for self-powered electricity of the present invention. DETAILED DESCRIPTION

[0054] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of the components as the criteria for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve the technical problem within a certain error range and basically achieve the technical effect.

[0055] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "horizontal", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are merely for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed or operate in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0056] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0057] The following is combined with Figures 1 to 11 The present invention provides a further detailed description of a zero-crossing remote switching control device and method for self-powered electricity, but this does not limit the present invention.

[0058] A self-powered zero-crossing remote switching control device, characterized by comprising a current sampling unit, an inductive power taking unit, a waveform sampling unit, a core control unit, a remote communication unit and an action control unit;

[0059] The inductive power supply unit is used to sense current from the AC circuit and convert it into DC voltage after voltage stabilization and filtering to power the device;

[0060] The current sampling unit is used to monitor the working current and transmit the working current information to the core control unit;

[0061] The waveform sampling unit is used to sample the voltage waveform of the input circuit and perform zero-crossing judgment;

[0062] The action control unit is used to receive instructions from the core control unit and control the device to be deployed and deployed;

[0063] The core control unit is used to monitor, calculate and judge based on the current signal of the current sampling unit, and when the current exceeds the threshold, it sends an activation / deactivation instruction to the action control unit through the single chip microcomputer;

[0064] The remote communication unit is used to transmit data with the core control unit and can be used for remote control of deployment.

[0065] The inductive power supply unit is connected to the snap-on CT for self-powering, and is also connected to the action control unit, current sampling unit, core control unit, remote communication unit, and waveform sampling unit for power supply. The current sampling unit and waveform sampling unit are electrically connected to the input end of the core control unit for information collection. The output port of the core control unit is connected to the action control unit to achieve on / off operation via a control relay. The remote communication unit is connected to the core control unit for data transmission.

[0066] The specific connection between the inductive power unit and the snap-on CT and the rectifier circuit are as follows: Figure 10 As shown, the circuit includes a power supply CT, a rectifier bridge, and a sampling resistor. The power supply CT is snap-on and can be directly attached to the AC input side of the monitoring line. The CT converts the high current into milliampere levels. The AC current then passes through the rectifier bridge and is output as a positive half-wave, which is then fed to the VIN power supply. After passing through the sampling resistor, the output current is converted into a voltage, which is then used by the current sampling unit to sense the real-time current.

[0067] like Figure 3 As shown, the specific circuit connection of the inductive power taking unit is:

[0068] The VCC1 power supply terminal is connected to resistor R10 and then leads to the VCC2 power supply terminal, which is divided into two branches. One branch is connected to the ground terminal through capacitor C16, and the other branch is connected to the anode of Schmitt trigger U4. Capacitor C16 is connected in parallel with resistor R12. One branch of the 3.3V power supply terminal is connected to the ground terminal through capacitor C33, and the other branch is connected to the cathode of Schmitt trigger U4. One branch of the 3.3V power supply terminal is connected to the ground terminal through capacitor C14, and the other branch is connected to the positive power supply terminal V+ of Schmitt trigger U4. The negative power supply terminal V- of Schmitt trigger U4 is connected to the ground terminal.

[0069] The output of the Schmitt trigger U4 is connected to the gate port 4 of the N-MOS transistor Q2 via a resistor R8, and the other is connected to the ground via a resistor R14; the source ports 1, 2, and 3 of the N-MOS transistor Q2 are connected and connected to the ground, and the drain ports 5, 6, 7, and 8 of the N-MOS transistor Q2 are connected and connected to the VIN power supply terminal;

[0070] One branch of the VIN power supply terminal is connected to the ground terminal through the TVS1 diode, and the other branch is connected to the Schottky diode VD5 and then divided into two branches and led to the VCC1 power supply terminal. One branch is connected to the ground terminal through the diode D1, and the other is connected to the ground terminal through the capacitor C36. The VCC1 power supply terminal is connected to the input terminal VIN of the linear stabilizer V1, and the output terminal VOUT of the linear stabilizer V1 is connected to the 3.3V power supply terminal and connected to the ground terminal through the capacitor C9. The ground terminal GND of the linear stabilizer V1 is connected to the circuit ground terminal.

[0071] The current at the VIN power supply passes through diode VD5, generating a voltage VCC1. This voltage is then stepped down to 3.3V by linear stabilizer V1, which is then used to power the other components of the device. Resistors R10 and R12 divide VCC1 into VCC2, which is then compared to the 3.3V terminal via a Schmitt trigger U4. If VCC2 is below 3.3V, the Schmitt trigger U4 outputs a low level. If it is above 3.3V, the Schmitt trigger U4 outputs a high level.

[0072] The output of the Schmitt trigger is connected to the gate of N-MOS transistor Q2. When the Schmitt trigger U4 outputs a low level, the N-MOS transistor is turned off, and current flows through Schottky diode VD5. When the Schmitt trigger U4 outputs a high level, the N-MOS transistor is turned on, and current flows through the drain of the N-MOS transistor, inputs the source of the N-MOS transistor, and then directly to ground. No current flows through Schottky diode VD5.

[0073] Resistors R10 and R12 are 27K and 10K, respectively. Since the voltage threshold at VCC2 is 3.3V, it follows that when the voltage at VCC1 exceeds 12V, the N-MOS transistor conducts. The CT transformer's output current flows directly to ground through the N-MOS transistor, avoiding Schottky diode VD5. This effectively controls the voltage at VCC1, ensuring it never exceeds 12V, protecting subsequent circuits from overvoltage. Furthermore, by connecting a voltage regulator diode and capacitor in parallel, the voltage fluctuation at VCC1 is reduced to 0.12V, allowing the output voltage to reach a stable state within 47ms after power-on.

[0074] like Figure 7 As shown, the specific circuit of the current sampling unit is:

[0075] The voltage on the AD-Ia side of the rectifier circuit is input to the negative pole of the op amp U2 through the resistor R5. The positive pole of the op amp U2 is connected to the V- terminal of the op amp U2 and to the ground terminal. The V+ terminal of the op amp U2 is connected to the 3.3V port. The 3.3V port is connected to the ground terminal through the capacitor C1. The output terminal of the op amp U2 is divided into two branches, one is connected to the negative pole of the op amp U2 through the resistor R4, and the other is connected to the bbAD-Ia output port through the resistor R6 and is connected to the ground terminal through the capacitor C2.

[0076] After the AC signal is rectified, the current forms a loop through the resistor R1. The voltage signal at R1 is AD-Ia, which is input to the negative pole of the operational amplifier U2. After reverse amplification by the operational amplifier, the output voltage bbAD-Ia is = UAD-Ia*R1*R5 / R4. The resistance values ​​of resistors R1, R5, and R4 are used to control the voltage of bbAD-Ia so that it will not exceed the input voltage range of the microcontroller, thereby protecting the microcontroller.

[0077] like Figure 4 As shown, the waveform sampling unit is specifically:

[0078] The main circuit voltage LN is connected to the IN port of the zero-crossing detection chip U1 through the resistor R11. The VDD port of the zero-crossing detection chip U1 is connected to the resistor R9 and further connected to the anode port 1 of the optocoupler D2. The cathode port 2 of the optocoupler D2 is connected to the VDD port of the zero-crossing detection chip U1. The anode port 1 of the optocoupler D2 is also connected to the capacitor C5 and connected to the VSS port of the zero-crossing detection chip U1.

[0079] The collector port 4 of the optocoupler D2 is divided into three branches, one is connected to the 3.3V power supply end through resistor R7, one is connected to the ground end through capacitor C4, and one is connected to the microcontroller input pin of the core control unit; the emitter port 3 of the optocoupler D2 is connected to the ground end.

[0080] L and N are the AC voltages. Zero-crossing detection chip U1 determines whether the voltage signal crosses zero. Resistor R11 is a voltage divider resistor, adjusting its value based on the L and N input voltages. Typically, when L and N are 220VAC, R11 is 300kΩ. Capacitor C5 acts as an energy storage capacitor, providing power to the chip and optocoupler.

[0081] When the input voltage is greater than the threshold of the zero-crossing detection chip U1, the chip charges the capacitor C5 through the internal circuit, and no current flows through the control terminal of the optocoupler D2, which is not conducting, and PLC_ZC_IN is high. When the input voltage is near the zero-crossing point and is less than the threshold voltage of the zero-crossing detection chip, the VDD terminal of the chip U1 is connected to the ground, and the voltage stored in C5 is output through the optocoupler D2. The optocoupler is conducting, and PLC_ZC_IN is low. The PLC_ZC_IN terminal is connected to the controller input port of the core control unit, so the controller can determine whether the voltage signal has crossed zero. Relationship between the PLC_ZC_IN output state and the AC side voltage input Figure 5 shown.

[0082] like Figure 8 As shown, the core control unit's main controller is a HC32F460JEUA microcontroller. The waveform sampling unit's output signal, PLC_ZC_IN, is connected to the microcontroller's GPIO port. High and low levels are used to determine whether the AC side is in a zero-crossing state. The current sampling unit's output analog signal, bbAD-Ia, is connected to the microcontroller's ADC port for real-time current readings.

[0083] The wireless communication unit is as follows Figure 11 As shown, the controller is connected to the core control unit via a serial port. The wireless communication unit itself provides three communication methods: LoRa, Wi-Fi, and Bluetooth. It offers three operating modes: AP, STA, and AP+STA. In AP mode, the module allows wireless devices to connect; STA mode only connects to a router; and AP+STA mode allows both wireless devices and routers. The wireless communication unit transmits data to a cloud platform via Bluetooth and a router. Users can access the cloud platform remotely via a mobile device and control the device's deployment and withdrawal in real time.

[0084] like Figure 6 The action control unit shown is specifically:

[0085] The VCC1 power supply end is connected to the resistor R44 and the resistor R21 respectively. The other end of the resistor R21 is divided into two branches. One branch is connected to the ground end through the capacitor CE2, and the other branch is connected to the other end of the resistor R44, the cathode of the diode VD3 and the positive terminal No. 1 of the relay control end. The negative terminal No. 2 of the relay KBZ1 control end is connected to the positive terminal of the diode VD3. The other branch of the negative terminal No. 2 of the relay KBZ1 control end is connected to the collector of the transistor Q1.

[0086] The output pin of the microcontroller of the core control unit outputs the control signal TKQ which is connected to the resistor R22 and then divided into two branches, one of which is connected to the ground terminal through the resistor R25, and the other is connected to the base of the transistor Q1. The resistor R25 is also connected in parallel with the capacitor C41.

[0087] The control signal TKQ is output by the microcontroller. When TKQ is high, transistor Q1 is turned on, 3.3V voltage flows through the relay, and current flows through pins 1 and 2 of the coil, thereby controlling pins 3 and 4 of the relay to operate. When TKQ is low, transistor Q1 is turned off, and the current cannot form a loop between the relay coil and the ground. Therefore, no current flows through pins 1 / 2 of the relay coil, and pins 3 / 4 of the relay do not operate.

[0088] TKQ is the trip control signal output by the microcontroller. TKQ+ is the trip feedback signal, connected to the microcontroller's input port. These two signals are used to determine the device's active / deactivated state. When the microcontroller detects a low level at TKQ+, the device is deactivated, disconnecting the downstream circuit. When the microcontroller detects a high level at TKQ+, the device is inactive and providing power to downstream equipment.

[0089] A method for remote switching control of self-powered zero-crossing, comprising the following steps:

[0090] S1.1. Set the current and voltage safety threshold parameters for the device through the mobile terminal. If the parameter setting is successful, jump to S2.1, otherwise jump to S1.2;

[0091] S1.2. If it detects that the wireless communication is not connected, the device automatically switches to the local threshold protection mode and performs the zero-crossing operation according to the preset safety parameters;

[0092] S2.1: The device uses the snap-on CT and inductive power supply unit to collect power and real-time data. If the power supply is successful, it jumps to S3; otherwise, it jumps to S2.2.

[0093] S2.2: When the power supply voltage is detected to be lower than the operating threshold, the backup circuit is automatically activated to maintain the operation of key monitoring functions and send a low-battery alarm;

[0094] S3, transmitting the digital signal to the controller of the remote communication unit through the digital signal conversion unit of the current sampling unit;

[0095] S4, the controller processor makes a judgment based on the preset parameters;

[0096] S4.1: When the current is detected to exceed the "safety threshold range", the switch automatically triggers the switch-on / off operation when the AC signal crosses zero, and jumps to S5. When the automatic switch-on / off operation fails, jumps to S4.2.

[0097] S4.2. If the automatic switching operation fails, the current and voltage data are continuously monitored and an alarm signal is sent to the remote monitoring platform via the wireless communication module. If the wireless communication module is not connected, the process goes to step S4.3.

[0098] S4.3. If it is detected that the wireless communication is not connected, the device automatically switches to the local threshold protection mode, performs the zero-crossing operation according to the preset safety parameters, and executes S5;

[0099] S5. After the activation / deactivation operation is successfully executed, the protection duration will start to be counted. When the protection duration reaches the "maximum protection duration 5-10s", the process will jump to S5.2. Otherwise, the process will jump to S5.1.

[0100] S5.1, the controller first performs a protection action, cutting off the power supply circuit at the zero crossing point, and automatically restores power supply at the next zero crossing point after the fault is eliminated;

[0101] s5.2. When the protection duration reaches the "maximum protection duration 5 to 10 seconds", the power is forced to remain in the off state and the secondary protection alarm is triggered.

[0102] First, the device draws power through a mutual inductor, and senses current from the AC line through an inductive power unit. After voltage stabilization and filtering, it is converted into a stable DC voltage to power the entire device, without the need for external power supply. The controller performs zero-crossing judgment through a waveform sampling unit, and monitors the working current in real time through a current sampling unit. When the current exceeds the safe working range, the device is automatically put in and out of operation at the zero-crossing point. The device supports remote wireless communication, and can be remotely operated through a mobile terminal to put the device in and out of operation. The data information is uploaded to the cloud platform through a remote wireless communication module, and the user can obtain the data information through the cloud platform. The present invention does not need to be connected to the State Grid platform. The voltage and current data monitored by the device can be read through the user's self-organized intelligent control platform. If there is an abnormality, the power can be cut off in time to protect the safety and stability of the subsequent circuit, and the zero-crossing operation has no effect on the main power supply circuit.

[0103] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A zero-crossing remote switching control device for self-powered electricity, characterized in that: It includes an inductive power acquisition unit, a current sampling unit, a waveform sampling unit, an action control unit, a core control unit and a remote communication unit; The inductive power supply unit is used to sense current from the AC circuit and convert it into DC voltage after voltage stabilization and filtering to power the device; The current sampling unit is used to monitor the working current and transmit the working current information to the core control unit; The waveform sampling unit is used to sample the voltage waveform of the input circuit and perform zero-crossing judgment; The action control unit is used to receive instructions from the core control unit and control the device to be deployed and retracted; The core control unit is used to monitor, calculate and judge based on the current signal of the current sampling unit, and when the current exceeds the threshold, it sends an activation / deactivation instruction to the action control unit through the single chip microcomputer; The remote communication unit is used to transmit data with the core control unit and can be used for remote control of deployment.

2. A zero-crossing remote switching control device for self-powered electricity according to claim 1, characterized in that: The inductive power taking unit is specifically: The VCC1 power supply terminal is connected to the resistor R10 and then to the VCC2 power supply terminal, and is divided into two branches. One branch is connected to the ground terminal through the capacitor C16, and the other branch is connected to the anode of the Schmitt trigger U4. The capacitor C16 is connected in parallel with the resistor R12. One 3.3V power supply terminal is connected to the ground terminal through capacitor C33, and the other is connected to the cathode of Schmitt trigger U4; one 3.3V power supply terminal is connected to the ground terminal through capacitor C14, and the other is connected to the positive power supply terminal V+ of Schmitt trigger U4. The negative power supply terminal V- of Schmitt trigger U4 is connected to the ground terminal; The output of the Schmitt trigger U4 is connected to the gate port 4 of the N-MOS transistor Q2 through a resistor R8, and is connected to the ground terminal through a resistor R14; the source ports 1, 2, and 3 of the N-MOS transistor Q2 are connected and connected to the ground terminal, and the drain ports 5, 6, 7, and 8 of the N-MOS transistor Q2 are connected and connected to the VIN power supply terminal; One of the Vin power supply terminals is connected to the ground terminal through the TVS1 diode, and the other branch is connected to the Schottky diode VD5 and then divided into one branch leading to the VCC1 power supply terminal, and the other branch is connected to the ground terminal through the diode D1. The capacitor C36 is connected to the diode D1 and connected to the ground terminal. The VCC1 power supply terminal is connected to the input terminal VIN of the linear stabilizer V1, the output terminal VOUT of the linear stabilizer V1 is connected to the 3.3V power supply terminal and connected to the ground terminal through the capacitor C9, and the ground terminal GND of the linear stabilizer V1 is connected to the circuit ground terminal.

3. The zero-crossing remote switching control device for self-powered electricity according to claim 1, characterized in that: The remote communication unit includes a Lora module, a WIFI module and a Bluetooth module. The remote communication unit is connected to the core control unit, transmits data with the mobile terminal through the remote communication unit, and receives control instructions from the mobile terminal.

4. The zero-crossing remote switching control device for self-powered electricity according to claim 1, characterized in that: The action control unit is specifically: The VCC1 power supply end is connected to the resistor R44 and the resistor R21 respectively. The other end of the resistor R21 is divided into two branches. One branch is connected to the ground end through the capacitor CE2, and the other branch is connected to the other end of the resistor R44, the cathode of the diode VD3 and the positive electrode No. 1 port of the relay control end. The negative electrode No. 2 port of the relay KBZ1 control end is connected to the positive electrode of the diode VD3. The other branch of the negative electrode No. 2 port of the relay KBZ1 control end is connected to the collector of the transistor Q1. The output pin of the microcontroller of the core control unit is connected to the resistor R22 and then divided into two branches, one of which is connected to the ground terminal through the resistor R25, and the other is connected to the base of the transistor Q1. The resistor R25 is also connected in parallel with the capacitor C41.

5. The zero-crossing remote switching control device for self-powered electricity according to claim 1, characterized in that: The waveform sampling unit is specifically: The main circuit voltage LN is connected to the IN port of the zero-crossing detection chip U1 through the resistor R11. The VDD port of the zero-crossing detection chip U1 is connected to the resistor R9 and further connected to the anode port 1 of the optocoupler D2. The cathode port 2 of the optocoupler D2 is connected to the VDD port of the zero-crossing detection chip U1. The anode port 1 of the optocoupler D2 is also connected to the capacitor C5 and connected to the VSS port of the zero-crossing detection chip U1. The collector port 4 of the optocoupler D2 is divided into three branches, one is connected to the 3.3V power supply end through the resistor R7, one is connected to the ground end through the capacitor C4, and one is connected to the microcontroller input pin of the core control unit; the emitter port 3 of the optocoupler D2 is connected to the ground end.

6. The zero-crossing remote switching control device for self-powered electricity according to claim 1, characterized in that: The inductive power taking unit is connected to the snap-on CT for self-powering, and is connected to the action control unit, the current sampling unit, the core control unit, the remote communication unit and the waveform sampling unit for power supply.

7. The zero-crossing remote switching control device for self-powered electricity according to claim 1, characterized in that: The current sampling unit and the waveform sampling unit are electrically connected to the input end of the core control unit for information collection, the output port of the core control unit is connected to the action control unit to realize the switching operation through the control relay, and the remote communication unit is connected to the core control unit for data transmission.

8. A method for remote switching on and off control of a self-generated electricity supply at a zero-crossing point, applied to a device for remote switching on and off control of a self-generated electricity supply at a zero-crossing point as described in claims 1 to 7, characterized in that: The specific steps are: S1.

1. Set the current and voltage safety threshold parameters for the device through the mobile terminal. If the parameter setting is successful, jump to S2.1, otherwise jump to S1.2; S1.

2. If it detects that the wireless communication is not connected, the device automatically switches to the local threshold protection mode and performs the zero-crossing operation according to the preset safety parameters; S2.1: The device uses the snap-on CT and inductive power supply unit to collect power and real-time data. If the power supply is successful, it jumps to S3; otherwise, it jumps to S2.

2. S2.2: When the power supply voltage is detected to be lower than the operating threshold, the backup circuit is automatically activated to maintain the operation of key monitoring functions and send a low-battery alarm; S3, transmitting the digital signal to the controller of the remote communication unit through the digital signal conversion unit of the current sampling unit; S4, the controller processor makes a judgment based on the preset parameters; S4.1: When the current is detected to exceed the "safety threshold range", the switch automatically triggers the switch-on / off operation when the AC signal crosses zero, and jumps to S5. When the automatic switch-on / off operation fails, jumps to S4.

2. S4.

2. If the automatic switching operation fails, the current and voltage data are continuously monitored and an alarm signal is sent to the remote monitoring platform via the wireless communication module. If the wireless communication module is not connected, the process goes to step S4.

3. S4.

3. If it is detected that the wireless communication is not connected, the device automatically switches to the local threshold protection mode, performs the zero-crossing operation according to the preset safety parameters, and executes S5; S5. After the activation / deactivation operation is successfully executed, the protection duration will start to be counted. When the protection duration reaches the "maximum protection duration 5-10s", the process will jump to S5.

2. Otherwise, the process will jump to S5.

1. S5.1, the controller first performs a protection action, cutting off the power supply circuit at the zero crossing point, and automatically restores power supply at the next zero crossing point after the fault is eliminated; s5.

2. When the protection duration reaches the "maximum protection duration 5 to 10 seconds", the power is forced to remain in the off state and the secondary protection alarm is triggered.

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