CN210799433U

CN210799433U - Exhaust fan control circuit based on infrared induction

Info

Publication number: CN210799433U
Application number: CN201920935022.5U
Authority: CN
Inventors: 何广成
Original assignee: Nanning University
Current assignee: Nanning University
Priority date: 2019-06-20
Filing date: 2019-06-20
Publication date: 2020-06-19
Anticipated expiration: 2029-06-20

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

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

Kitchen exhaust fans are very common in our kitchen, the air in the kitchen is greatly purified, the exhaust fans on the market at present are of a direct switch type, so that a lot of troubles are brought to the life of people, for example, after the kitchen is used, the taste of the kitchen needs to be exhausted for a certain time, the electricity needs to be shut down after waiting for a period of time, the life rhythm of people at present is fast, people often need to go to work (or process other things) without waiting for time after using the kitchen, and the kitchen can generate peculiar smell after a long time.

For example, the publication No. CN104806549A discloses "a control system for indoor exhaust fan and lamp", which includes an inlet, an exhaust fan and a lamp installed on an indoor ceiling, and a power supply supplying power to the exhaust fan and the lamp through a power supply circuit, and also includes an automatic power supply triggering mechanism, an automatic power supply closing mechanism, and a control device, wherein the automatic power supply triggering mechanism is installed at the inlet and electrically connected to the control device; the system further controls the exhaust fan or the lamp to be switched off by switching off the power supply, and the repeated switching off of the power supply can not only cause the waste of electric energy but also damage the chip.

SUMMERY OF THE UTILITY MODEL

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

The utility model discloses a following technical scheme can realize.

The utility model provides a pair of exhaust fan control circuit based on infrared induction includes 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.

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.

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.

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.

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.

The beneficial effects of the utility model reside in that: the circuit receives an induction signal through the infrared detection chip and transmits the induction signal to the single chip microcomputer, the relay is further controlled to be turned off, the exhaust fan is controlled, the circuit structure is optimized, electric energy is saved, meanwhile, a time delay program and a memory mode are designed in the single chip microcomputer, and the exhaust fan can be controlled to be turned on or off more accurately according to the surrounding actual environment.

Drawings

FIG. 1 is a flow chart of the present invention;

fig. 2 is a circuit diagram of the present invention.

Detailed Description

The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1, an exhaust fan control circuit based on infrared induction comprises a power supply, an infrared induction module, a central processing module and an exhaust fan driving module, wherein the power supply is connected with the infrared induction module, the central processing module and the exhaust fan driving module, and the infrared induction module is sequentially connected with the central processing module and the exhaust fan driving module.

The infrared sensing module shown in fig. 2 is an infrared human body detection chip U2 of CHRS012 model, 3 feet of the infrared human body detection chip U2 are connected with a power supply, 2 feet are connected with a central processing module, 1 foot is grounded, 1 foot of the infrared human body detection chip U2 is a VSS end, 2 feet are an OUT output end, 3 feet are VCC power supply ends, the working mode of U2 is that the power is on and then the power is preheated, and a high level is output to the single chip microcomputer U1 when the human body is detected again.

The central processing module comprises a singlechip U1, a crystal oscillator Y1, a switch S1, capacitors C1-C3 and a resistor R3.

The singlechip U1 is an STC89C52 singlechip, a pin 1 of the singlechip U1 is connected with a pin 2 of the infrared human body detection chip U2, a pin 9 of the singlechip U1 is connected between the switch S1 and the resistor R3, the other end of the resistor R3 is grounded, the other end of the switch S1 is connected with a power supply, the capacitor C1 is connected in parallel with two ends of the switch S1,

pins

18 and 19 of the singlechip U1 are respectively connected with two ends of the crystal oscillator Y1, two ends of the crystal oscillator Y1 are respectively connected with one end of the capacitor C2 and one end of the capacitor C3, the other ends of the capacitor C2 and the capacitor C3 are grounded, and a pin 31 and a pin 40 of the singlechip U686.

The single chip microcomputer U1 is internally provided with a time delay program, after receiving a level signal transmitted by the infrared human body detection chip U2, a time delay is provided when a command is sent to the relay K1, and the on-off of the exhaust fan can be controlled more humanized.

The exhaust fan driving module comprises a relay K1, a triode Q1, a triode Q2, an exhaust fan pin J1, a resistor R1, 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 triode Q1's base, the base of triode Q2 is connected with resistance R1 one end, the resistance R1 other end is connected with the power, the collecting electrode of triode Q2, the collecting electrode of triode Q1 ground respectively, the emitter of triode Q1 is connected with relay K1's coil one end, relay K1's coil other end is connected with the power, relay K1's contact one end is connected with the power live wire, the other end is connected with 1 foot of exhaust fan row needle J1, 2 feet of exhaust fan row needle J1 are connected with the power zero line.

A resistor R2 is arranged between the pin 23 of the singlechip U1 and the base of the triode Q2, two ends of the resistor R2 are connected with a diode D1 in parallel, the anode of the diode D1 is connected with the pin 23 of the singlechip U1, the diode D1 is a light emitting diode, and the on-off state of the exhaust fan can be visually seen through the light emitting condition of the diode D1.

The utility model discloses the theory of operation: the infrared human body detection chip U2 normally works, when the internal infrared sensing module detects a human body, 2 feet of the U2 continuously output TTL logic high level, the single chip microcomputer 23 is controlled by internal logic, the feet of the single chip microcomputer 23 output TTL logic low level, the triodes Q1 and Q2 are conducted, and the relay K1 is attracted to enable the exhaust fan circuit to be switched on. When the infrared human body detection chip U2 can not detect the human body, 2 feet of U2 continuously output TTL logic low level, 1 foot P00 of the single chip microcomputer receives the TTL logic low level, an internal timer is started, timing is carried out (time can be set through programming or the time can be set through an external key of the single chip microcomputer), if the timing time is up, 23 feet P22 of the single chip microcomputer output TTL logic high level, triodes Q1 and Q2 are cut off, and a relay K1 does not suck, so that the exhaust fan circuit is broken, and the function of delaying the disconnection of the exhaust fan circuit is realized.

Claims

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;

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.