Smoke ventilator intelligent control system based on low-pass filtering application circuit

A technology of intelligent control system and amplifying circuit, applied in general control system, control/adjustment system, computer control, etc., can solve the problem that the range hood cannot be automatically turned on or off, so as to ensure stability, stable performance, and improve effective effect of life

Inactive Publication Date: 2016-03-16
CHENGDU FEIKAIRUI TECH CO LTD
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AI-Extracted Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defect that the range hood in the prior art cannot be automatically turned on or off according ...
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Abstract

The invention discloses a smoke ventilator intelligent control system based on a low-pass filtering application circuit. The system is mainly composed of a central processor, a power supply, a smog sensor connected with an A/D analog-to-digital converter, a three-end voltage stabilizing filter circuit connected in series between the power supply and the central processor, and the A/D analog-to-digital converter, a motor and an alarm which are connected with the central processor, and is characterized in that the low-pass filtering application circuit is also connected in series between the smog sensor and the A/D analog-to-digital converter; the low-pass filtering application circuit is composed of a signal filter circuit connected with the smog sensor and a signal amplification circuit connected with the signal filter circuit; and the output end of the signal amplification circuit is connected with the low A/D analog-to-digital converter. The intelligent household smoke ventilator control system provided by the invention can accurately acquire an oil smoke concentration value, accurately controls a smoke ventilator to be automatically turned on or turned off, and provides a good living environment for people.

Application Domain

Programme controlComputer control +1

Technology Topic

Intelligent control systemEngineering +6

Image

  • Smoke ventilator intelligent control system based on low-pass filtering application circuit
  • Smoke ventilator intelligent control system based on low-pass filtering application circuit
  • Smoke ventilator intelligent control system based on low-pass filtering application circuit

Examples

  • Experimental program(1)

Example Embodiment

[0020] The present invention will be further described in detail below in conjunction with examples, but the implementation of the present invention is not limited thereto.
[0021] Such as figure 1 As shown, the present invention is mainly composed of a central processing unit, a power supply, an A/D analog-to-digital converter, a motor, and an alarm all connected to the central processing unit, and a smoke sensor connected to the A/D analog-to-digital converter. It is composed of a three-terminal stabilized filter circuit between the power supply and the central processing unit, and a low-pass filter amplifier circuit connected in series between the smoke sensor and the A/D analog-to-digital converter. Among them, the three-terminal regulator filter circuit such as figure 2 As shown, it is composed of a transformer T, a diode rectifier U, and a voltage adjustable regulator circuit.
[0022] Among them, one input end of the diode rectifier U is connected to the same-named end of the secondary inductance coil of the transformer T, and the other input end thereof is connected to the non-identical end of the secondary inductance coil of the transformer T. The anode of the polar capacitor C1 is connected to the cathode output end of the diode rectifier U, and the cathode is connected to the anode output end of the diode rectifier U. The input terminals of the adjustable voltage stabilizing circuit are connected with the positive output terminal and the negative output terminal of the diode rectifier U, and the output terminal is connected with the single chip microcomputer. The same-named end and the non-same-named end of the primary inductance coil of the transformer T together form the input end of a three-terminal stabilized filter circuit, which is connected to the power supply.
[0023] In order to ensure the reliable operation of the present invention, the central processing unit preferentially adopts the SOP8 central processing unit. The MULT pin of the SOP8 central processing unit is connected to the A/D analog-to-digital converter, the ZCD pin is connected to the motor, and the SE An alarm connected to the pin. The power supply is 220V alternating current, the 220V alternating current is rectified and filtered by a three-terminal stabilized filter circuit to output a stable 12V direct current voltage, and the 12V direct current voltage supplies power to the central processing unit.
[0024] Such as figure 2 As shown, the voltage adjustable voltage stabilization circuit consists of amplifier P1, transistor VT1, transistor VT2, transistor VT3, resistor R1, resistor R2, resistor R3, resistor R4, adjustable resistor R5, resistor R6, resistor R7, and polar capacitor C2 , Polar capacitor C3, polar capacitor C4, diode D2, diode D3, diode D4, diode D5, and diode D6.
[0025] When connected, the positive pole of the polar capacitor C2 is connected to the negative output terminal of the diode rectifier U after the resistance R1, and the negative pole is connected to the base of the triode VT1. The P pole of the diode D4 is connected to the anode output terminal of the diode rectifier U through the resistor R3 and the resistor R2 in sequence, and the N pole is connected to the base of the transistor VT3. The P pole of the diode D2 is connected to the anode of the polar capacitor C2 through the resistor R4, and the N pole is connected to the collector of the transistor VT2. The P pole of the diode D3 is connected to the emitter of the triode VT1 after the adjustable resistance R5, and the N pole is connected to the positive input terminal of the amplifier P1.
[0026] Among them, the positive pole of the polar capacitor C3 is connected to the base of the transistor VT2, and the negative pole is connected to the positive input terminal of the amplifier P1. The positive pole of the polar capacitor C4 is connected to the negative input terminal of the amplifier P1, and the negative pole is connected to the emitter of the transistor VT3. The P pole of the diode D5 is connected to the output terminal of the amplifier P1, and the N pole is connected to the emitter of the transistor VT2 through the resistor R6. The P pole of the diode D6 is connected to the output terminal of the amplifier P1 through the resistor R7, and the N pole and the collector of the triode VT3 together form the output terminal of the voltage adjustable regulator circuit. The collector of the transistor VT1 is grounded.
[0027] When the present invention is in operation, the 220V power supply is stepped down by the transformer T to generate 12V alternating current. The 12V alternating current is rectified by the diode rectifier U and converted into a 12V direct current voltage. The 12V direct current voltage is filtered by the filter polar capacitor C1 to obtain a smooth 12V DC voltage, which outputs a stable 12V DC voltage after high and low voltage regulation by a voltage adjustable voltage regulator circuit.
[0028] The low-pass filter amplifier circuit is such as image 3 As shown, it is composed of a signal filter circuit connected to the smoke sensor, and a signal amplifier circuit connected to the signal filter circuit; the signal filter circuit is composed of a transistor VT5, a diode D8, a resistor R9, a resistor R10, a resistor R11, and a resistor R14, resistor R15, polar capacitor C6, polar capacitor C7, polar capacitor C8, diode D7, and diode D8 are composed.
[0029] When connected, the N pole of the diode D7 is connected to the collector of the transistor VT5 through the resistor R10, and the P pole is connected to the anode of the polar capacitor C6. The cathode of the polar capacitor C6 is connected to the N of the diode D8 after the resistor R9. The poles are connected. The cathode of the polar capacitor C7 is connected to the P pole of the diode D8 through the resistor R11, and the anode is connected to the base of the transistor VT. The positive pole of the polar capacitor C8 is connected with the P pole of the diode D8, and the negative pole passes through the resistor R14 and the resistor R15 in sequence and then forms the output terminal of the signal filter circuit together with the emitter of the transistor VT5 and is connected with the signal amplifying circuit. The N pole of the diode D7 serves as the input end of the signal filter circuit and is connected to the smoke sensor.
[0030] Further, the signal amplification circuit is composed of amplifier P2, transistor VT4, diode D11, resistor R8, resistor R12, resistor R13, resistor R16, resistor R17, resistor R18, resistor R19, resistor R20, resistor R21, polar capacitor C5, The linear capacitor C9, the polar capacitor C10, the polar capacitor C11, the diode D9, the diode D10, and the diode D11 are composed.
[0031] When connecting, one end of the resistor R13 is connected to the emitter of the triode VT5, and the other end is connected to the base of the triode VT4. The N pole of the diode D9 is connected to the emitter of the transistor VT5 through the resistor R12, and the P pole is connected to the negative electrode of the polar capacitor C9, and the positive electrode of the polar capacitor C9 is connected to the negative electrode of the amplifier P2. The cathode of the polar capacitor C10 is connected to the emitter of the transistor VT4 via the resistor R16, and the anode is connected to the P pole of the diode D11 via the resistor R18 and the resistor R20 in sequence.
[0032] The N pole of the diode D10 is connected to the P pole of the diode D9 through a resistor R17, and its P pole is connected to the cathode of the polar capacitor C5 through a resistor R19. The anode of the polar capacitor C5 is connected to the N of the diode D11. The poles are connected. The negative pole of the polar capacitor C11 is connected with the output terminal of the amplifier P2, and the positive pole is used as the output terminal of the signal amplifying circuit through the resistor R8 and is connected with the A/D analog-to-digital converter. One end of the resistor R21 is connected to the anode of the polar capacitor C11, and the other end is connected to the N electrode of the diode D1. The collector of the triode VT4 is grounded; the positive pole of the amplifier P2 is connected to the negative pole of the polar capacitor C8 through a resistor R15 and a resistor R14.
[0033] When the present invention is in operation, the smoke concentration signal collected by the smoke sensor is eliminated by the signal filter circuit of the low-pass filter amplifier circuit to eliminate the harmonics in the signal, and the signal processed by the signal filter circuit is amplified by the signal amplifier circuit and then transmitted to A /D analog-to-digital converter.
[0034] During operation, the described smoke sensor preferentially adopts the JTY-GD-T12 type smoke sensor, which is used to collect the concentration value of oil smoke, and transmit the collected oil smoke concentration value signal to A through a low-pass filter amplifier circuit. /D analog-to-digital converter. The A/D analog-to-digital converter converts the concentration value of the oil smoke transmitted by the smoke sensor into a data signal and transmits it to the central processing unit. A minimum concentration value of oil fume is set in the central processor, and the central processor converts the received data signal into a data value and compares it with the minimum concentration value of oil fume.
[0035] If the converted data value is greater than the set minimum concentration of oil fume, the alarm will start to alarm. At the same time, the central processing unit will output a control current to the motor, and the motor will start after it is energized, and the range hood will start working at this time. When the concentration value of oil fume collected by the smoke sensor is compared by the central processor, if it is less than the set minimum concentration value of oil fume, the central processor stops outputting current, the motor loses power, and the range hood stops working.
[0036] In order to ensure the reliable operation of the present invention, the A/D analog-to-digital converter preferentially uses the ADC0809AD analog-to-digital converter with stable performance, and the alarm uses the HARBT-6000-T alarm with high sensitivity.
[0037] As mentioned above, the present invention can be implemented well.

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