Introduction to smart sockets
Time:
Jun 17,2024
hardware design
The smart socket mainly consists of five parts, namely power management, metering module, MCU control, wireless module, and relay control module. The functions of each module are as follows:
1. Power management: Using AC/DC switching power supply, convert AC 220 to 5V to provide power for the motherboard:
2. Measurement module: detects the voltage, current, and power of the load electrical appliances, using a single energy measurement chip for detection. The measurement chip samples the load AC voltage signal and load current signal, and after processing by an internal DSP algorithm, outputs the power value, voltage effective value, and current effective value in a pulse manner:
a) Current sampling: The load current flows through the manganese copper resistor because the resistance value of the manganese copper resistor is fixed and unchanged. Different load currents result in different voltage drops at both ends of the manganese copper resistor. The metering chip collects the voltage drop values at both ends of the manganese copper resistor to sample the current signal. Only in the sample store can the purchased components be purchased!
b) Voltage sampling: After the AC zero line signal is divided by a resistor, it is input into the voltage detection channel of the metering chip and sampled through the DSP algorithm integrated inside the chip
3. MCU control: The intelligent control part of the smart socket collects electrical energy data, analyzes and processes it, and sends and receives server data and instructions through wireless modules and server networking. Generally, low-power MCUs are used, such as TI's MSP430;
4. Wireless module: There are several mainstream communication protocols such as WIFl, Ziqbee, and zWave, consisting of one wireless communication chip and one ARM chip. It connects to the server for data transmission:
5. Relay control module: controls the connection and disconnection of load electrical power supply
