CN202694056U - Automatic power-off energy saving device for household appliances - Google Patents

Abstract

The automatic power-off energy-saving device for household appliances includes: a power detection module composed of a current transformer arranged on a load circuit and a rectifier filter connected with the current transformer; a single-chip microcomputer connected with the rectifier filter, and The display module connected to the data output end of the single-chip microcomputer, and the control display module composed of the first solid-state relay connected to the control terminal of the single-chip microcomputer, and the first solid-state relay is connected to the load circuit in parallel; and, by connecting with the single-chip microcomputer A control display module composed of a second solid-state relay connected to the control terminal, the second solid-state relay is connected in series to the load circuit, the utility model can monitor the working condition of the electric appliance in real time, and the automatic power-off energy-saving device that responds accurately adopts The STC12C5204AD single-chip microcomputer performs data processing and control, and applies digital-to-analog conversion and relay control technology to realize automatic power-off, and power off its own device to achieve zero power consumption in standby.

Description

Automatic power-off energy-saving device for household appliances

technical field

The utility model belongs to the technical field of energy-saving of household appliances, in particular to an automatic power-off energy-saving device for household appliances. the

Background technique

Currently, users have the habit of not unplugging the electrical appliances after using them, which results in unnecessary power loss when the electrical appliances are in standby. Due to the habit of not pulling out the plugs in Tianjin, Tianjin citizens waste more than 100 million yuan in electricity bills a year. According to the calculation of Home Appliance China Information Network, due to the power consumption caused by the standby of household appliances, ordinary households need to pay an extra electricity bill of about 100 yuan a year, which is equivalent to paying an extra month of electricity bills. Moreover, when the electrical appliance is in standby, the components will age and shorten the service life, and it may cause a fire. But what use on the market is generally all button type switch sockets at present, can not solve this problem very conveniently. the

Contents of the invention

In order to overcome the above-mentioned deficiencies in the prior art, the purpose of the utility model device is to provide an automatic power-off energy-saving device for household appliances, which can monitor the working conditions of electrical appliances in real time and accurately respond to the automatic power-off energy-saving device. Carry out data processing and control, apply digital-to-analog conversion and relay control technology to realize automatic power-off, and power off its own device to achieve zero power consumption in standby. the

In order to achieve the above object, the technical scheme adopted by the utility model device is:

Automatic power-off energy-saving devices for household appliances, including:

A power detection module composed of a current transformer arranged on the load circuit and a rectifier filter connected to the current transformer;

A single-chip microcomputer connected to the rectifier filter, a display module connected to the data output terminal of the single-chip microcomputer, and a control display module composed of a first solid-state relay connected to the control terminal of the single-chip microcomputer, and the first solid-state relay is connected to the load in parallel on the circuit;

And, a terminal control module composed of a second solid-state relay connected to the control terminal of the single-chip microcomputer, and the second solid-state relay is connected in series to the load circuit. the

Compared with the prior art, the utility model can be well used in families where electrical appliances are often on standby, and can bring a lot of convenience to people and save electric energy. the

Description of drawings

Fig. 1 is a structural block diagram of the utility model device. the

Fig. 2 is a circuit schematic diagram of the power detection module of the device of the present invention. the

Fig. 3 is a circuit schematic diagram of the device control and information display module of the utility model. the

Fig. 4 is a circuit schematic diagram of the relay control module of the utility model device. the

Fig. 5 is a working flow chart of the utility model device. the

Detailed ways

Below in conjunction with accompanying drawing and example the utility model device is described in further detail. the

As shown in Figure 1, the utility model device generally includes three parts: a power detection module, a control and information display module, and a relay control module. the

The power detection module is composed of a current transformer arranged on the load circuit and a rectifier filter connected with the current transformer. A specific circuit adopted by the utility model device is shown in Figure 2, and the current transformer TR1 samples the load circuit The current in the circuit is rectified by a bridge rectifier composed of four diodes IN4007 and then becomes a DC signal, and then filtered by a π-type filter composed of capacitor C1, capacitor C2 and resistor R1 to reduce the pulsation, plus 5.1 V Zener diode, the role is that when the power of the electrical appliance is large, the current transformer TR1 induces a large current, and the converted voltage signal may be higher than the recognizable voltage range of the AD conversion of the single-chip microcomputer. Using a 5.1V Zener diode 1N4733A can make The output voltage is a maximum of 5.1V. There is also an inductor L1 with an inductance coefficient of 1mH to prevent the circuit from jittering, and finally the stable analog DC signal is sent to the P1^4 port of the microcontroller for analog-to-digital conversion into a digital signal for processing. the

The control and information display module is composed of a single-chip computer connected to the rectifier filter, a display module connected to the data output terminal of the single-chip computer, and a first solid-state relay connected to the control terminal of the single-chip computer. The specific circuit is shown in Figure 3. Considering the size of the power supply design, the STC12C5204AD single-chip microcomputer packaged with DIP20 pins is used as the main control chip. This series of single-chip microcomputers is a new generation of 8051 single-chip microcomputers with high speed, low power consumption and super interference. , the internal integration has 8-bit A/D conversion (300,000 times per second). In this design, the A/D conversion speed is not high, so the A/D conversion speed is set to be converted once in 140 clock cycles. The display part uses LCD1602 as the display module, because LCD1602 requires eight data lines and two control lines, a total of ten lines to control, and the pins provided by the single-chip microcomputer itself cannot meet the needs, so the serial-to-parallel converter 74HC595 is used in the design. Expand I/O port, drive LCD1602. the

In addition to the crystal oscillator and the reset circuit, which are the fixed circuits of the minimum system, the peripheral devices of the single-chip microcomputer have a signal indicator light, and two 9012 PNP transistors are connected to the P1_3 and P3_7 ports of the single-chip microcomputer, which are used to drive and control the electrical circuit. The relay and control the coil of the power relay of the microcontroller control part. In the program, if the P1_3 port is set to be low level, the Q2 transistor will be turned on, and the key2 terminal will output a high level, so that the coil of the relay RL2 (the power relay of the microcontroller control part) When it is powered on, the electric shock is closed, and the function of the port P3_7 is the same as that of the P1_3 port. the

The terminal control module includes the second solid-state relay connected to the load circuit connected to the control terminal of the single-chip microcomputer. A specific circuit used in the utility model is shown in Figure 4. The power supply module of the control terminal adopts a switch-type stabilized power supply. The power supply is widely used due to its high efficiency and strong voltage adaptability. In this device, a mature switching power supply module is used to supply power to the control module. A second solid-state relay RL2 is added to the front end of the switching power supply to control its own power supply on and off. After cutting off the electrical power supply, it can also cut off its own power supply. the

In the design of the relay circuit, the two relays RL1 and RL2 both use the normally open interface. When the microcontroller controls the corresponding I/O port to set the potential to 0, the PNP transistor is turned on and the relay is closed. When it is necessary to cut off the power of the switching power supply , only need the single-chip microcomputer to control the corresponding I/O port to be set, the triode is cut off, the relay is de-energized, the main contact is pulled back by the spring, the switching power supply is de-energized, and the control module is de-energized accordingly. the

In the circuit, because the relay cannot be turned on in the natural state, the switching power supply cannot be energized. If you need to start the whole system, you need to use the built-in 5V power supply to supply power to the coil of the second solid state relay RL2 (the power relay of the single-chip microcomputer control part). Make the switching power supply energized and make the single-chip microcomputer system work, and then drive the relay RL2 coil in turn. At this time, the self-contained power supply can stop the power supply, and the whole system starts and works normally. the

The working process of the device of the present invention is shown in Figure 5. When the self-contained power supply is used to supply power to the coil of the second solid-state relay RL2, the main contact of the relay is closed, the switching power supply is energized, the control module is energized accordingly, and the single-chip microcomputer passes through the control triode The conduction makes the second solid state relay RL2 self-locking, so that the whole system no longer needs its own power supply to supply power to the relay coil after normal operation. Initialize the LCD display and A/D conversion, which is used to set the display format and set the A/D conversion speed and signal input pins. After the initialization is complete, the main program enters the waiting loop, waiting for the A/D conversion to respond to the A/D interrupt subroutine, so the power parameter display, data analysis, and relay control part of the program are all completed in the A/D interrupt subroutine. the

The data analysis algorithm in the A/D interrupt will analyze the data in real time, and the current transformer will collect the current current. When the preset program in the MCU thinks that the electrical appliance enters the standby mode, it will control the first solid state relay RL1 to cut off the main line power supply, and control The second solid-state relay RL2 cuts off the power supply of the device itself to realize self-power-off in standby. the

Claims (1)

1. An automatic power-off energy-saving device for household appliances, characterized in that it comprises: A power detection module composed of a current transformer arranged on the load circuit and a rectifier filter connected to the current transformer; A single-chip microcomputer connected to the rectifier filter, a display module connected to the data output terminal of the single-chip microcomputer, and a control display module composed of a first solid-state relay connected to the control terminal of the single-chip microcomputer, and the first solid-state relay is connected to the load in parallel on the loop; And, a terminal control module composed of a second solid-state relay connected to the control terminal of the single-chip microcomputer, and the second solid-state relay is connected in series to the load circuit.

Images