"Walking tube, turn off all power, pay attention to safety!" This kind of words believe that everyone is familiar. Now the sockets on the market are basically non-intelligent. People are connected to the outlets. People generally do not directly cut off the electrical power supply. Thus, the electrical appliance is always in standby. If the socket is in turn on, the electrical appliance will generate standby. Power consumption, resulting in waste of electricity. What's more, if you use a short circuit or over-load, it is possible to cause a fire, there is a big safety hazard.
The implementation of smart socket products can indeed help users solve potential problems. Safe power is really personal safety, so it is very practical in designing a safe and energy intelligent socket. This energy-saving intelligent socket scheme is set up in solving energy waste and promoting low-carbon life with electricity security.
First, smart socket design principle
As shown in Figure 1, the entire system consists of five parts, which are system power, power detecting modules, MCU control units, actuators, input peripherals.
2, hardware design and principle
The power module is based on the LNK304 design. In Fig. 2, L and N are 220V AC electrical electrical interfaces, and the AC is added to the LNK304 chip, and the S foot of the LNK304 outputs 12V voltage, and is pressed into 6V through R13 and R14 to strengthen the driving ability, part of the tertiary tube. The output voltage Vdd is about 5V.
The power detection uses the FC7759 chip, and the FC7759 will calculate the power based on the collected voltage signal and the current signal, and the frequency of the pulse sequence is proportional to the size of the power based on the size of the power in the CF pin. The single chip microcomputer can determine the size of the power based on the read pulse frequency to issue a corresponding instruction to control the actuator to make a corresponding action. In the figure, FLQ is a sampling resistor, collecting the current signal, R3, R4, R5, R6 resistance partial pressure, and collecting voltage signals.
Second, MCU control section
The control section uses the MP20E01 single-chip microcomputer. The model single-chip power consumption is low, the size is small, and the price is low, and the IO is also satisfied with the needs of this design. As shown in Figure 4, the pulse signal output by the power detecting module is sent to the P14 pin of the MP20E01 single chip, the P12 pin read button signal, the P15 pin reads the external infrared remote control signal, the P13 pin controlling the LED indicator, P1.1 Control Relay Open or Off Broken socket power supply.
Control the relay is turned on or turned off when the microcontroller is too high or too low to control the relay power supply.
By button input, you can implement the on-and shutdown of the socket power supply, and some function settings (such as setting learning functions), which is mainly used to turn on the socket power.
Third, software flow chart
As shown in Figure 8, the program process is initialized after power-on, and the timer is initialized, and the interrupt initial configuration is interrupted and then entering the large cycle. Detect buttons or infrared signals, if the input has no signal, continue to detect buttons and infrared signals, if there is signal input, turn on the socket power. Then the microcontroller determines if it is an empty load. If the empty load controls the relay shutdown the socket power supply, if not the empty load, the learning function setting flag bit is 1, if 1 is a learning function setting, if not Take 1 to the next step. Single chip determines whether the current power is at a threshold. 1881. Power. In the range of power. In this range, it is loop to the button detection if the power does not control the relay after a period of time.
This smart socket design This system supports multiple infrared bands, which can operate the system using a variety of infrared remote controls. Solved the waste problem of the use of electrical standby energy consumption, also solved the safety problem when using electrical short circuit or overload operation, stable operation, strong anti-interference ability, high reliability, and user-friendly. More importantly, the structure is simple and low cost is very good application prospect.
Source: Wiku Electronic Market Network
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