Three-phase four-wire intelligent power switch

Abstract

This utility model discloses a three-phase four-wire smart power switch, including a neutral wire module as the main unit, and A-phase, B-phase, and C-phase modules as slave units. The neutral wire module, A-phase module, B-phase module, and C-phase module are interconnected through two sets of pin headers. The main unit includes a main unit CPU and a WIFI module, a main unit sampling module, a drive module, and a power supply module electrically connected to the main unit CPU. The main unit CPU is used to control and process data, operate relays, and handle faults or abnormal actions. The WIFI module is electrically connected to the main unit CPU and is used to exchange data with external devices. The sampling module is used to collect current and voltage signals flowing through each phase and transmit zero-crossing signals and overcurrent signals to the main unit CPU via interruption. The drive module is used for magnetic latching relay control. The power supply module is used to provide 12V operating power to the main unit and slave units.

Description

Technical Field

[0001] This utility model belongs to the field of electrical switch technology, specifically relating to a three-phase four-wire intelligent electrical switch. Background Technology

[0002] With the rapid development of smart home technology, WiFi smart switches have gradually become an important part of modern home and office environments due to their convenient remote control, timed operation and linkage with other smart devices. However, existing WiFi smart switches still have certain limitations in design and function, mainly in the following two aspects: (1) Single-phase power supply limitation. Most WiFi smart switches on the market only support single-phase power supply, which is suitable for ordinary household lighting or low-power appliance control. However, in commercial or industrial scenarios, many devices (such as high-power motors, three-phase air conditioners, industrial machinery, etc.) require three-phase power supply support. Existing single-phase smart switches cannot be directly applied to such scenarios, which limits their scope of use. In addition, single-phase switches are also insufficient in terms of load balancing and power efficiency, making it difficult to meet the needs of high-power or complex circuit systems. (2) Large size. Existing WiFi smart switches usually adopt the design architecture of traditional relays and integrate WiFi communication modules, control circuits and heat dissipation structures, resulting in a large overall size. The large size not only affects the aesthetics of installation, but may also occupy too much space in the electrical box, making it difficult to install multiple switches side by side or deploy in a small space. In addition, large switches are more inconvenient to install and maintain, especially for renovating old buildings or compact living environments, where this problem is more prominent. Utility Model Content

[0003] In view of the above-mentioned problems, this utility model provides a three-phase four-wire intelligent power switch.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A three-phase four-wire smart power switch includes a neutral wire module as the main unit, and A-phase, B-phase, and C-phase modules as slave units, wherein the neutral wire module, A-phase module, B-phase module, and C-phase module are... The phase module and the C-phase module are interconnected via two sets of pin headers. The host unit further includes a host CPU and a WIFI module, a host sampling module, a drive module, and a power supply module electrically connected to the host CPU. The host CPU is used for controlling and processing data, operating relay actions, and handling faults or abnormal actions. The WIFI module is electrically connected to the host CPU and is used for data exchange with external systems. The sampling module is used to collect current and voltage signals flowing through each phase and transmit zero-crossing signals and overcurrent signals to the host CPU via interrupts. The drive module is used for magnetic latching relay control. The power supply module provides 12V operating power to the host and slave units. The slave unit further includes a slave sampling module, a relay module, and a slave CPU. The slave sampling module is used to collect current and voltage signals flowing through the unit. The slave CPU is used to process the collected current and voltage signals and send control commands to the relay module. The relay module is used to connect or disconnect the circuit current.

[0006] In one possible implementation, the host CPU is an STC32G8K64 microcontroller.

[0007] In one possible implementation, the slave CPU is an STC32G8K64 microcontroller.

[0008] In one possible implementation, the slave sampling module includes a BL0942 chip for acquiring signals including phase voltage, current, zero crossing, and power consumption, and transmitting the data to the slave CPU for processing via the chip's TX and RX pins.

[0009] In one possible implementation, the power module includes an LS10-13B chip and a J1 splicing component for converting AC230V AC mains voltage to DC12V / 1A voltage.

[0010] The present invention offers the following advantages: it solves the problem of connecting three-phase electrical equipment in public places to an intelligent control system. This invention's three-phase four-wire intelligent power switch has the advantages of high current (20A / 40A / 63A / 100A) and small size. It is only 18mm*4 wide, similar to a miniature circuit breaker. Attached Figure Description

[0011] Figure 1 This is a module block diagram of a three-phase four-wire smart power switch according to an embodiment of the present utility model;

[0012] Figure 2 This is a block diagram illustrating the module principle of a three-phase four-wire smart power switch according to an embodiment of the present invention.

[0013] Figure 3 This is a schematic diagram of the host CPU in a three-phase four-wire smart power switch according to an embodiment of the present invention. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0015] See Figure 1 and Figure 2 The diagram shown is a schematic block diagram of a three-phase four-wire smart power switch according to this utility model, including a neutral wire module as the main unit, and A-phase modules, B-phase modules, and C-phase modules as slave units. The phase module and the C-phase module are interconnected via two sets of pin headers. The main unit further includes a main unit CPU and a WIFI module, a main unit sampling module, a drive module, and a power supply module electrically connected to the main unit CPU. The main unit CPU is used to control and process data, operate relay actions, and handle faults or abnormal actions. The WIFI module is electrically connected to the main unit CPU and is used for data exchange with the outside. The sampling module is used to collect the current and voltage signals flowing through each phase and transmit the zero-crossing signal and overcurrent signal to the main unit CPU in an interrupt manner. The drive module is used for magnetic latching relay control. The power supply module is used to provide 12V operating power to the main unit and the slave unit. The slave unit further includes a slave unit sampling module, a relay module, and a slave unit CPU. The slave unit sampling module is used to collect the current and voltage signals flowing through it. The slave unit CPU is used to process the collected current and voltage signals and send control commands to the relay module. The relay module is used to connect or disconnect the circuit current.

[0016] In a specific application example, such as Figure 3As shown, in another embodiment of this utility model, the main CPU of a three-phase four-wire smart power switch uses an STC32G8K64 microcontroller. The slave CPU also uses an STC32G8K64 microcontroller. The STC32G8K64 is a high-performance microcontroller based on the 32-bit 8051 core, launched by STC Technology. Its main frequency can reach up to 60 MHz. The 64KB Flash memory supports multiple erase / write cycles (approximately 100,000 cycles). The 8KB SRAM offers fast operation and is suitable for data caching. 2K BEEPROM is used to store key parameters. It has multiple 16 / 32-bit timers, supporting PWM and capture / compare. Multiple UART, SPI, and I²C interfaces support hardware flow control. A 12-bit high-precision ADC supports multi-channel input. External bus expansion (such as parallel interfaces) is supported. These microcontroller features enable the three-phase four-wire smart power switch of this utility model embodiment to possess excellent control and expansion capabilities.

[0017] In a specific application example, the sampling module of a three-phase four-wire smart power switch according to another embodiment of this utility model includes a BL0942 chip, which is used to collect signals including phase voltage, current, zero crossing, and power consumption. The data is transmitted to the slave CPU for processing by the TX and RX pins of the chip.

[0018] In a specific application example, the power module of a three-phase four-wire smart power switch according to another embodiment of this utility model includes an LS10-13B chip and a J1 splicing component, used to convert AC230V mains voltage to DC12V / 1A voltage. The power supply of the handset is introduced from pins 8 and 5 of the J1 terminal, with a DC voltage of 12-24V, which is then stepped down to 3.3V by the SY8120B chip to power the internal logic circuit.

[0019] In a specific application example, the STC32G8K64 microcontroller, the host CPU of a three-phase four-wire smart power switch according to another embodiment of this utility model, uses two serial ports for inter-device communication. Serial port UART3 communicates with the upper-level device, and serial port UART4 communicates with the lower-level device.

[0020] This invention solves the problem of connecting three-phase electrical equipment to intelligent control systems in public places. The three-phase four-wire intelligent power switch of this invention has the advantages of high current (20A / 40A / 63A / 100A) and small size. It is only 18mm*4 wide, similar to a miniature circuit breaker.

[0021] The three-phase four-wire smart power switch described above can be connected to public or customized smart systems (such as Mi Home, Tuya Smart, etc.) via WiFi. It has the function of collecting data on current, voltage, active power, reactive power, and power consumption. It can also control relays to open or close loads. Contact operation is controlled by zero-crossing detection, allowing for switching at zero point, reducing arcing and extending contact lifespan.

[0022] It should be understood that the exemplary embodiments described herein are illustrative and not restrictive. Although one or more embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art will understand that various changes in form and detail may be made without departing from the spirit and scope of the present invention as defined by the appended claims.

Claims

1. A three-phase four-wire intelligent power switch, characterized in that, The system includes a neutral wire module as the main unit, and A-phase, B-phase, and C-phase modules as slave units. These modules are interconnected via two sets of pin headers. The main unit includes a main CPU and, electrically connected to the main CPU, a WIFI module, a main sampling module, a drive module, and a power supply module. The main CPU controls and processes data, operates relays, and handles faults or abnormal actions. The WIFI module, electrically connected to the main CPU, exchanges data with external systems. The sampling module collects current and voltage signals flowing through each phase and transmits zero-crossing and overcurrent signals to the main CPU via interrupts. The drive module controls magnetically latched relays. The power supply module provides 12V power to the main and slave units. The slave unit further includes a slave sampling module, a relay module, and a slave CPU. The slave sampling module collects current and voltage signals; the slave CPU processes the collected current and voltage signals and sends control commands to the relay module; the relay module connects or disconnects the circuit current.

2. The three-phase four-wire intelligent power switch as described in claim 1, characterized in that, The host CPU uses an STC32G8K64 microcontroller.

3. The three-phase four-wire intelligent power switch as described in claim 1, characterized in that, The slave unit's CPU uses an STC32G8K64 microcontroller.

4. The three-phase four-wire intelligent power switch as described in claim 3, characterized in that, The slave sampling module includes a BL0942 chip, which is used to collect signals including phase voltage, current, zero crossing, and power consumption. The data is transmitted to the slave CPU for processing via the chip's TX and RX pins.

5. The three-phase four-wire intelligent power switch as described in claim 1, characterized in that, The power module includes an LS10-13B chip and a J1 splicing component, which is used to convert AC230V AC mains voltage to DC12V / 1A voltage.

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