CN210799433U - An Exhaust Fan Control Circuit Based on Infrared Induction - Google Patents

Abstract

The utility model discloses an exhaust fan control circuit based on infrared induction, including power, infrared induction module, central processing module, exhaust fan drive module, the power is connected with infrared induction module, central processing module, exhaust fan drive module, infrared induction module and central processing module, exhaust fan drive module connect gradually, this circuit accepts the sensing signal through infrared detection chip and passes to the singlechip, the turn-off of further control relay, reach the control to the exhaust fan, circuit structure has been optimized, the electric energy has been practiced thrift, simultaneously the design has time delay procedure and memory mode in the singlechip, can be according to the break-make of actual environment more accurately control exhaust fan on every side.

Description

An Exhaust Fan Control Circuit Based on Infrared Induction

technical field

The utility model relates to an exhaust fan control circuit based on infrared induction.

Background technique

Kitchen exhaust fans are very common in our kitchen, which greatly purifies the air in the kitchen. At present, the exhaust fans on the market are all directly on and off, which brings a lot of trouble to our life. For example, after we use the kitchen, the kitchen It also takes a certain amount of time to exhaust the smell, so it takes a while to turn off the power. Nowadays, people's life pace is relatively fast, and they often have to rush to work (or treatment) after using the kitchen without time to wait. other things), which over time can lead to odors in the kitchen.

For example, the publication No. CN104806549A describes "a control system for an indoor exhaust fan and a lamp", the system includes an inlet, an exhaust fan and a lamp arranged on the indoor ceiling, and a power supply for powering it through a power supply circuit, and also It includes a power automatic trigger mechanism, a power automatic shutdown mechanism and a control device. The power automatic trigger mechanism is arranged at the entrance and is electrically connected to the control device; the power automatic shutdown mechanism is arranged indoors and is electrically connected to the control device. The control device is electrically connected To the power supply circuit, and control the connection or disconnection of the power supply circuit, the system further controls the disconnection of the exhaust fan or the lamp by disconnecting the power supply. Repeatedly disconnecting the power supply during use will not only cause waste of electric energy, but also make the chip receive damage.

Utility model content

In order to solve the above technical problems, the utility model provides an exhaust fan control circuit based on infrared induction.

The utility model is realized by the following technical solutions.

An infrared induction-based exhaust fan control circuit provided by the utility model comprises a power supply, an infrared induction module, a central processing module, and an exhaust fan drive module. The power supply is connected with the infrared induction module, the central processing module, and the exhaust fan drive module, and the infrared induction module is connected with The central processing module and the exhaust fan drive module are connected in sequence.

The infrared sensing module is an infrared human body detection chip U2 of the CHRS012 model. The 3 feet of the infrared human body detection chip U2 are connected to the power supply, the 2 feet are connected to the central processing module, and the 1 foot is grounded.

The central processing module includes a single-chip microcomputer U1, a crystal oscillator Y1, a switch S1, and capacitors C1-C3.

The single-chip microcomputer U1 is a STC89C52 single-chip microcomputer. The 1-pin of the single-chip microcomputer U1 is connected with the 2-pin of the infrared human body detection chip U2. The 9-pin of the single-chip microcomputer U1 is connected between the switch S1 and the ground, the other end of the switch S1 is connected to the power supply, and the capacitor C1 is connected in parallel with the switch. At both ends of S1, pins 18 and 19 of MCU U1 are respectively connected to both ends of crystal oscillator Y1, both ends of crystal oscillator Y1 are respectively connected to one end of capacitor C2 and capacitor C3, the other end of capacitor C2 and capacitor C3 are grounded, and pins 31 and 40 of MCU U1 The pins are connected to the power supply.

The exhaust fan drive module includes a relay K1, a triode Q1, a triode Q2, an exhaust fan pin header J1, a power live wire, and a power neutral wire.

The base of the triode Q2 is connected to pin 23 of the single-chip microcomputer U1, the emitter of the triode Q2 is connected to the base of the triode Q1 and the power supply, the collector of the triode Q2 and the collector of the triode Q1 are grounded respectively, and the emitter of the triode Q1 is connected to the ground. One end of the coil of the relay K1 is connected, the other end of the coil of the relay K1 is connected to the power supply, one end of the contact of the relay K1 is connected to the live wire of the power supply, and the other end is connected to the pin 1 of the exhaust fan header J1, and the second pin of the exhaust fan header J1 is connected to the power supply neutral line. connect.

A resistor R2 is arranged between pin 23 of the single-chip microcomputer U1 and the base of the transistor Q2, and a diode D1 is connected in parallel at both ends of the resistor R2, and the anode of the diode D1 is connected to the pin 23 of the single-chip microcomputer U1.

The beneficial effects of the utility model are as follows: the circuit receives the induction signal and transmits it to the single-chip microcomputer through the infrared detection chip, and further controls the turn-off of the relay, achieves the control of the exhaust fan, optimizes the circuit structure, and saves electric energy. The delay program and memory mode can more accurately control the opening and closing of the exhaust fan according to the actual surrounding environment.

Description of drawings

Fig. 1 is the flow chart of the present utility model;

Figure 2 is a circuit diagram of the present invention.

Detailed ways

The technical solutions of the present invention are further described below, but the scope of protection is not limited to the description.

In order to make the objectives, technical solutions and advantages of the present utility model more clear, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

An infrared induction-based exhaust fan control circuit as shown in FIG. 1 includes a power supply, an infrared induction module, a central processing module, and an exhaust fan drive module. The power supply is connected to the infrared induction module, the central processing module, and the exhaust fan drive module. The infrared induction module It is connected with the central processing module and the exhaust fan drive module in sequence.

The infrared sensing module shown in Figure 2 is the infrared human body detection chip U2 of the CHRS012 model. The 3 feet of the infrared human body detection chip U2 are connected to the power supply, the 2 feet are connected to the central processing module, and the 1 foot is grounded. The infrared human body detection chip Pin 1 of U2 is the VSS terminal, pin 2 is the OUT output terminal, and pin 3 is the VCC power supply terminal. The working mode of U2 is to preheat after power-on, and then output a high level to the microcontroller U1 when it detects a human body.

The central processing module includes a single-chip microcomputer U1, a crystal oscillator Y1, a switch S1, capacitors C1-C3, and a resistor R3.

The single-chip microcomputer U1 is STC89C52 single-chip microcomputer. The 1-pin of the single-chip microcomputer U1 is connected with the 2-pin of the infrared human body detection chip U2. The 9-pin of the single-chip microcomputer U1 is connected between the switch S1 and the resistor R3, the other end of the resistor R3 is grounded, and the other end of the switch S1 is connected to the power supply. Capacitor C1 is connected in parallel with both ends of switch S1. Pins 18 and 19 of MCU U1 are connected to both ends of crystal oscillator Y1 respectively. Both ends of crystal oscillator Y1 are connected to one end of capacitor C2 and capacitor C3 respectively. The other end of capacitor C2 and capacitor C3 is grounded. The 31-pin and 40-pin are connected to the power supply.

There is a delay program inside the single-chip microcomputer U1. After receiving the level signal from the infrared human body detection chip U2, there will be a time delay when sending an instruction to the relay K1, which can control the opening of the exhaust fan more humanely. break.

The exhaust fan drive module includes relay K1, transistor Q1, transistor Q2, exhaust fan pin header J1, resistor R1, power live wire, and power neutral wire.

The base of the transistor Q2 is connected to pin 23 of the microcontroller U1, the emitter of the transistor Q2 is connected to the base of the transistor Q1, the base of the transistor Q2 is connected to one end of the resistor R1, the other end of the resistor R1 is connected to the power supply, and the collector of the transistor Q2 , The collectors of the transistor Q1 are grounded respectively, the emitter of the transistor Q1 is connected to one end of the coil of the relay K1, the other end of the coil of the relay K1 is connected to the power supply, one end of the contact of the relay K1 is connected to the power live wire, and the other end is connected to the exhaust fan pin header J1. Pin 1 is connected, and pin 2 of the pin header J1 of the exhaust fan is connected to the neutral line of the power supply.

There is a resistor R2 between pin 23 of the microcontroller U1 and the base of the transistor Q2, and a diode D1 is connected in parallel at both ends of the resistor R2. The anode of the diode D1 is connected to the pin 23 of the microcontroller U1. The light-emitting situation can visually see the disconnection state of the exhaust fan.

The working principle of the utility model: the infrared human body detection chip U2 works normally, when the internal infrared sensing module detects the human body, the 2 pin of U2 continuously outputs the TTL logic high level, the single chip 23 is controlled by the internal logic, and the single chip 23 pin outputs the TTL logic low power Flat, turn on the transistors Q1, Q2, and the relay K1 absorbs, so that the exhaust fan circuit is connected. When the infrared human body detection chip U2 cannot detect the human body, the 2 pin of U2 continues to output the TTL logic low level, and the 1 pin P00 of the single-chip microcomputer receives the TTL logic low level, and starts the internal timer for timing (the time can be set by programming. If the timer expires, pin 23 P22 of the single-chip microcomputer will output TTL logic high level, cut off the transistors Q1 and Q2, and the relay K1 will not pick up, so that the exhaust fan circuit will be disconnected, and the exhaust fan circuit will be disconnected after a delay. function.

Claims (5)

1. The utility model provides an exhaust fan control circuit based on infrared induction which characterized in that: including power, infrared induction module, central processing module, exhaust fan drive module, the power is connected with infrared induction module, central processing module, exhaust fan drive module, and infrared induction module connects gradually with central processing module, exhaust fan drive module.

2. An infrared induction based exhaust fan control circuit as claimed in claim 1, wherein: the infrared induction module is the infrared human detection chip U2 of CHRS012 model, the power is connected to 3 feet of infrared human detection chip U2, and 2 feet are connected with central processing module, 1 foot ground connection.

3. An infrared induction based exhaust fan control circuit as claimed in claim 1, wherein: the central processing module comprises a singlechip U1, a crystal oscillator Y1, a switch S1 and capacitors C1-C3;

the single-chip microcomputer U1 is an STC89C52 single-chip microcomputer, a pin 1 of the single-chip microcomputer U1 is connected with a pin 2 of the infrared human body detection chip U2, a pin 9 of the single-chip microcomputer U1 is connected between a switch S1 and the ground, the other end of the switch S1 is connected with a power supply, the capacitor C1 is connected with two ends of the switch S1 in parallel, pins 18 and 19 of the single-chip microcomputer U1 are connected with two ends of a crystal oscillator Y1 respectively, two ends of the crystal oscillator Y1 are connected with one end of a capacitor C2 and one end of a capacitor C3 respectively, the other ends of the capacitor C2 and the capacitor C3 are connected with the ground, and.

4. An infrared induction based exhaust fan control circuit as claimed in claim 1, wherein: the exhaust fan driving module comprises a relay K1, a triode Q1, a triode Q2, an exhaust fan pin J1, a power supply live wire and a power supply zero wire;

the base of triode Q2 is connected with 23 feet of singlechip U1, the emitter of triode Q2 is connected with the base of triode Q1, the power is connected, the collector of triode Q2, the collector of triode Q1 are grounded respectively, the emitter of triode Q1 is connected with one end of the coil of relay K1, the other end of the coil of relay K1 is connected with the power, one end of the contact of relay K1 is connected with the live wire of the power supply, the other end of the contact is connected with 1 foot of exhaust fan pin bank J1, and 2 feet of exhaust fan pin bank J1 are connected with the zero line of the power supply.

5. An infrared induction based exhaust fan control circuit as claimed in claim 4, wherein: a resistor R2 is arranged between the pin 23 of the singlechip U1 and the base electrode of the triode Q2, two ends of the resistor R2 are connected with a diode D1 in parallel, and the anode of the diode D1 is connected with the pin 23 of the singlechip U1.

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