Automatic range hood control circuit
By introducing a signal conditioning circuit, including a potentiometer and an operational amplifier, into the smoke detection module, the problem of traditional smoke detection modules being unable to amplify weak signals is solved, enabling the detection and effective warning of low-concentration smoke.
Patent Information
- Application Number
- CN202520164720.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-24
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2035-01-24
AI Technical Summary
Traditional smoke detection modules do not include a signal conditioning module, which cannot condition and amplify weak electrical signals, resulting in low sensitivity and inability to effectively detect low concentrations of smoke.
A signal conditioning circuit is introduced, including a potentiometer Rp, an operational amplifier UA, a resistor R4, an indicator LED, and a digital-to-analog converter P1. The potentiometer and operational amplifier amplify and condition the electrical signal of the smoke sensor, improving the sensitivity of the smoke sensor, and issuing an alarm through a speaker and indicator light.
The sensitivity of the smoke sensor has been improved, enabling it to detect low concentrations of smoke indoors and alert users with sound and light, thus enhancing the warning effect.
Smart Images
Figure CN223758268U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to control circuit technical field, especially for a kind of automatic fume machine control circuit. BACKGROUND
[0002] Automatic fume machine is a kind of intelligent kitchen appliance, can automatically detect smoke and peculiar smell in kitchen, and promptly carries out extraction, keeps kitchen air fresh. Automatic fume machine control circuit is usually equipped with smoke sensor and / or odor sensor. Smoke sensor generally utilizes light scattering principle or ionization principle, when smoke particle enters sensor, will make the light path or ion balance inside sensor change, to generate electric signal. Odor sensor is through the adsorption and reaction to various gas molecules, causes the change of its electrical properties, such as resistance change etc., to detect the existence of peculiar smell. Sensor detects smoke or peculiar smell, signal is transmitted to main control chip. Main control chip judges whether to need to start fume machine and adjusts the operating power of fume machine according to preset threshold and algorithm. When smoke or odor concentration is lower, fume machine can run at lower power;When concentration is higher, fume machine will automatically switch to high-power mode to quickly extract fume and odor.
[0003] Automatic fume machine control circuit includes smoke detection circuit, and smoke detection module in smoke detection circuit can convert smoke signal into electric signal, and electric signal drives automatic fume machine to work, extracts indoor smoke, but traditional smoke detection module does not include signal conditioning module, cannot carry out conditioning amplification to weak electric signal, leads to that smoke detection module sensitivity is lower, if indoor smoke concentration is lower, then automatic fume machine will not start, and indoor air cannot be maintained at relatively clean level. UTILITY MODEL CONTENTS
[0004] The main purpose of the utility model is to provide a kind of automatic fume machine control circuit, to solve the problem that traditional smoke detection module does not include signal conditioning module in the related art, cannot carry out conditioning amplification to weak electric signal.
[0005] To achieve the above-mentioned purpose, according to one aspect of the utility model, an automatic fume machine control circuit is provided, comprising: a power supply circuit, the power supply circuit provides power for the automatic fume machine control circuit;
[0006] A smoke detection circuit, the smoke detection circuit is used to detect the concentration of indoor smoke;
[0007] A control circuit, the control circuit is used to adjust the working mode and working intensity of fume machine;
[0008] An alarm circuit, the alarm circuit is used to emit alarm sound;
[0009] A drive circuit, the drive circuit is used to drive fume machine to work.
[0010] signal conditioning circuit connected with the smoke detection circuit, the signal conditioning circuit comprising a potentiometer Rp, an operational amplifier UA, a resistor R4, an indicator lamp LED, a capacitor C4 and a digital-to-analog converter P1, the fixed end of the potentiometer Rp being connected with the non-inverting input terminal of the operational amplifier UA, the movable end of the potentiometer Rp being connected with the inverting input terminal of the operational amplifier UA, the output terminal of the operational amplifier UA being connected with the AOUT pin of the digital-to-analog converter P1, the compensation pin of the operational amplifier UA being connected with the DOUT pin of the digital-to-analog converter P1, the resistor R4 being connected in series with the indicator lamp LED between the zeroing pin and the output terminal of the operational amplifier UA, one end of the capacitor C4 being connected with the indicator lamp LED and the other end being grounded.
[0011] Further, the power supply circuit comprises an alternating current AC, a transformer B, a capacitor C1, a rectifier bridge and a diode D5, the rectifier bridge being composed of a diode D1, a diode D2, a diode D3 and a diode D4, the alternating current AC being connected with the input terminal of the transformer B, the output terminal of the transformer B being connected with the alternating current input pin of the rectifier bridge, one end of the capacitor C1 being connected with the direct current output pin of the rectifier bridge and the other end being connected with the diode D5.
[0012] Further, the smoke detection circuit comprises a smoke sensor QM, a resistor R1, a diode group, a transistor T1 and a variable resistor W1, the diode group comprising a diode D6, a diode D7 and a diode D8, the resistor R1 being connected in parallel with the capacitor C1, the resistor R1 being connected with the AO pin of the smoke sensor QM, the DO pin of the smoke sensor QM being connected with the variable resistor W1, the diode D6, the diode D7 and the transistor T1 being connected in series, the diode D6 being connected with the AO pin of the smoke sensor QM and the diode D8 being connected with the DO pin of the smoke sensor QM.
[0013] Further, the control circuit comprises a switch group, a relay J1, a relay J2, a capacitor C2, a capacitor C3, a motor M1, a motor M2 and an indicator lamp LP, the switch group comprising a switch K1, a switch K2, a switch K3 and a switch K4, the switch K1 being connected in series with the alternating current AC and the control circuit, for adjusting the smoke machine to be in an automatic mode or a manual mode, the relay J1, the relay J2, the switch K2, the switch K3 and the switch K4 being connected in parallel, the indicator lamp LP being connected in series with the relay J1, the motor M1 and the motor M2 being connected in parallel, for controlling the working of the smoke machine, the capacitor C2 and the capacitor C3 being connected in series.
[0014] Further, the alarm circuit comprises an audio integrated circuit IC, a speaker SP, a resistor assembly, an inverter F1, an inverter F2, an inverter F3, an inverter F4, a diode D9, a diode D10, a resistor R2 and a resistor R3, the resistor assembly comprises a variable resistor W2, a variable resistor W3, a thermistor Rt and a photosensitive resistor cds, the speaker SP is connected with an audio output end of the audio integrated circuit IC, an audio input end of the audio integrated circuit IC is connected with an emitter of the transistor T1, the variable resistor W2 is connected with the thermistor Rt in parallel, the inverter F1 is connected with the diode D9 in series, the photosensitive resistor cds is connected with the variable resistor W3 in parallel, the inverter F2 is connected with the diode D10 in series, the inverter F3 is connected with the resistor R2 in series, and the inverter F4 is connected with the resistor R3 in series.
[0015] Further, the potentiometer Rp is connected with the variable resistor W1, and the resistor R4 is connected with an audio input end of the audio integrated circuit IC.
[0016] Compared with the prior art, the utility model has the following beneficial effects: when the smoke sensor QM works, the smoke sensor QM interacts with the smoke in the surrounding environment, in the clean air, the resistance is higher, and the smoke detection circuit is in the open circuit state, when the smoke exists, the smoke is adsorbed and reacts on the sensor surface, changes the electronic structure in it, causes the resistance to drop, the change makes the voltage output of the smoke sensor QM change, completes the conversion of the gas concentration to the electric signal, the converted electric signal is amplified and processed through the potentiometer Rp and the operational amplifier UA, is easily identified to the AOUT end of the digital-analog converter P1, improves the sensitivity of the smoke sensor QM, can detect the smoke of lower concentration in the room, the DOUT end of the digital-analog converter P1 transmits the smoke signal identified to the indicating lamp LED and the audio integrated circuit IC, the audio integrated circuit IC converts the electric signal identified into the sound signal and transmits through the speaker SP, the speaker SP sends the alarm sound, reminds people that there is smoke in the room, simultaneously, the indicating lamp LED is lighted, sends the light warning, the indicating lamp LED and the speaker SP send the sound and light warning simultaneously, strengthen the prompting effect. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 It is control circuit diagram for the utility model;
[0018] Figure 2 It is signal conditioning circuit diagram for the utility model. DETAILED DESCRIPTION
[0019] In order to further illustrate the technical means and effects adopted by the utility model for realizing the predetermined utility model purposes and the specific implementation mode, structure, features and effects thereof, the following will be described in detail in combination with the drawings and preferred embodiments.
[0020] Referring to Figure 1 and Figure 2 The embodiment provides an automatic range hood control circuit, which comprises a power supply circuit, wherein the power supply circuit provides power for the automatic range hood control circuit.
[0021] A smoke detection circuit is configured to detect the concentration of indoor smoke.
[0022] A control circuit is configured to adjust the working mode and intensity of the range hood.
[0023] An alarm circuit is configured to emit an alarm sound.
[0024] A driving circuit is configured to drive the range hood to work.
[0025] A signal conditioning circuit is connected to the smoke detection circuit, and comprises a potentiometer Rp, an operational amplifier UA, a resistor R4, an indicator lamp LED, a capacitor C4 and a digital-to-analog converter P1; the fixed end of the potentiometer Rp is connected to the non-inverting input end of the operational amplifier UA; the movable end of the potentiometer Rp is connected to the inverting input end of the operational amplifier UA; the output end of the operational amplifier UA is connected to the AOUT pin of the digital-to-analog converter P1; the compensation pin of the operational amplifier UA is connected to the DOUT pin of the digital-to-analog converter P1; the resistor R4 and the indicator lamp LED are connected in series between the zeroing pin and the output end of the operational amplifier UA; one end of the capacitor C4 is connected to the indicator lamp LED, and the other end is grounded.
[0026] The power supply circuit comprises an alternating current (AC) power supply, a transformer B, a capacitor C1, a rectifier bridge and a diode D5; the rectifier bridge is composed of a diode D1, a diode D2, a diode D3 and a diode D4; the AC power supply is connected to the input end of the transformer B; the output end of the transformer B is connected to the AC input pin of the rectifier bridge; one end of the capacitor C1 is connected to the DC output pin of the rectifier bridge, and the other end is connected to the diode D5.
[0027] The smoke detection circuit comprises a smoke sensor QM, a resistor R1, a diode group, a transistor T1 and a variable resistor W1; the diode group comprises a diode D6, a diode D7 and a diode D8; the resistor R1 is connected in parallel with the capacitor C1; the resistor R1 is connected to the AO pin of the smoke sensor QM; the DO pin of the smoke sensor QM is connected to the variable resistor W1; the diode D6, the diode D7 and the transistor T1 are connected in series; the diode D6 is connected to the AO pin of the smoke sensor QM; the diode D8 is connected to the DO pin of the smoke sensor QM.
[0028] The control circuit comprises a switch group, a relay J1, a relay J2, a capacitor C2, a capacitor C3, a motor M1, a motor M2 and an indicator lamp LP, the switch group comprises a switch K1, a switch K2, a switch K3 and a switch K4, the switch K1 is connected in series with the AC power supply and the control circuit, and is used for adjusting the smoke machine to an automatic mode or a manual mode, the relay J1, the relay J2, the switch K2, the switch K3 and the switch K4 are connected in parallel, the indicator lamp LP is connected in series with the relay J1, the motor M1 and the motor M2 are connected in parallel, and are used for controlling the smoke machine to work, and the capacitor C2 and the capacitor C3 are connected in series.
[0029] The alarm circuit comprises an audio effect integrated circuit IC, a speaker SP, a resistor assembly, an inverter F1, an inverter F2, an inverter F3, an inverter F4, a diode D9, a diode D10, a resistor R2 and a resistor R3, the resistor assembly comprises a variable resistor W2, a variable resistor W3, a thermistor Rt and a photosensitive resistor cds, the speaker SP is connected with an audio output end of the audio effect integrated circuit IC, an audio input end of the audio effect integrated circuit IC is connected with an emitter of a transistor T1, the variable resistor W2 is connected in parallel with the thermistor Rt, the inverter F1 is connected in series with the diode D9, the photosensitive resistor cds is connected in parallel with the variable resistor W3, the inverter F2 is connected in series with the diode D10, the inverter F3 is connected in series with the resistor R2, and the inverter F4 is connected in series with the resistor R3.
[0030] The potentiometer Rp is connected with the variable resistor W1, and the resistor R4 is connected with an audio input end of the audio effect integrated circuit IC.
[0031] 220V AC power supply is reduced by transformer B, rectified by diode D1, diode D2, diode D3 and diode D4, filtered by capacitor C1 and stabilized by diode D5, and a stable DC voltage is outputted to supply power to the control circuit, and the motor M1 and the motor M2 provide power for the smoke machine, the motor M1 and the motor M2 are turned on, the smoke machine starts to work, indoor gas is sucked into the smoke machine and discharged, and indoor air is kept clean; the manual mode or the automatic mode is selected by the switch K1, after the automatic mode is selected, the photoresistor cds and the thermistor Rt work at the same time, and then cooperate with the variable resistor W2 and the variable resistor W3, the signal sent by the smoke sensor QM is processed by the inverter F1, the inverter F2, the inverter F3 and the inverter F4, and then the opening and closing states of the control relay J1 and the control relay J2 are controlled, so that the closing states of the switches K2-K4 are controlled, when the indoor smoke concentration is high, the control relay J2 controls the switch K3 to be closed, and the strong wind mode is selected, when the indoor smoke concentration is high, the control relay J1 controls the switch K4 to be closed, and the weak wind mode is selected; when the smoke sensor QM works, the smoke sensor QM interacts with the smoke in the surrounding environment, in clean air, the resistance value of the smoke sensor QM is high, and the smoke detection circuit is in an open circuit state; when there is smoke, the smoke is adsorbed and reacts on the surface of the sensor, changes the electronic structure inside the sensor, and causes the resistance value to decrease, the change causes the voltage outputted by the smoke sensor QM to change, the conversion from the gas concentration to the electric signal is completed, the converted electric signal is amplified and processed by the potentiometer Rp and the operational amplifier UA, and then the AOUT end of the digital-analog converter P1 can easily identify the converted electric signal, the sensitivity of the smoke sensor QM is improved, the smoke sensor QM can detect the indoor smoke with a low concentration, the smoke signal identified by the DOUT end of the digital-analog converter P1 is transmitted to the indicator lamp LED and the audio integrated circuit IC, the audio integrated circuit IC converts the identified electric signal into a sound signal and transmits the sound signal through the loudspeaker SP, the loudspeaker SP emits an alarm sound to remind people that there is smoke in the room, and the indicator lamp LED emits light to warn, the indicator lamp LED and the loudspeaker SP emit sound and light at the same time to strengthen the warning effect.
[0032] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed in the preferred embodiment, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above-mentioned equivalent embodiments without departing from the technical solution of the present application. Any modification, equivalent change and modification of the above-mentioned embodiments according to the technical essence of the present application still belong to the scope of the technical solution of the present application.
Claims
1. An automatic hood control circuit, characterized by comprising: It includes: Power supply circuit, the power supply circuit provides power for automatic smoke machine control circuit; Smoke detection circuit, the smoke detection circuit is used for detecting the concentration of indoor smoke; Control circuit, the control circuit is used for adjusting the working mode and working strength of the smoke machine; Alarm circuit, the alarm circuit is used for issuing alarm sound; Signal conditioning circuit, the signal conditioning circuit is connected with the smoke detection circuit, the signal conditioning circuit includes potentiometer Rp, operational amplifier UA, resistor R4, indicator lamp LED, capacitor C4 and digital-to-analog converter P1, the fixed end of the potentiometer Rp is connected with the non-inverting input terminal of the operational amplifier UA, the movable end of the potentiometer Rp is connected with the inverting input terminal of the operational amplifier UA, the output terminal of the operational amplifier UA is connected with the AOUT pin of the digital-to-analog converter P1, the compensation pin of the operational amplifier UA is connected with the DOUT pin of the digital-to-analog converter P1, the resistor R4 is connected in series between the zeroing pin and the output terminal of the operational amplifier UA, one end of the capacitor C4 is connected with the indicator lamp LED, and the other end is grounded.
2. The automatic hood control circuit according to claim 1, wherein The power supply circuit includes alternating current AC, transformer B, capacitor C1, rectifier bridge and diode D5, the rectifier bridge is composed of diode D1, diode D2, diode D3 and diode D4, the alternating current AC is connected with the input terminal of the transformer B, the output terminal of the transformer B is connected with the alternating current input pin of the rectifier bridge, one end of the capacitor C1 is connected with the direct current output pin of the rectifier bridge, and the other end is connected with the diode D5.
3. The automatic hood control circuit according to claim 1, wherein The smoke detection circuit includes smoke sensor QM, resistor R1, diode group, transistor T1 and variable resistor W1, the diode group includes diode D6, diode D7 and diode D8, the resistor R1 is connected in parallel with the capacitor C1, the resistor R1 is connected with the AO pin of the smoke sensor QM, the DO pin of the smoke sensor QM is connected with the variable resistor W1, the diode D6, diode D7 and transistor T1 are connected in series, the diode D6 is connected with the AO pin of the smoke sensor QM, and the diode D8 is connected with the DO pin of the smoke sensor QM.
4. The automatic hood control circuit according to claim 1, wherein The control circuit includes switch group, relay J1, relay J2, capacitor C2, capacitor C3, motor M1, motor M2 and indicator lamp LP, the switch group includes switch K1, switch K2, switch K3 and switch K4, the switch K1 is connected in series with the alternating current AC and the control circuit, and is used for adjusting the smoke machine to automatic mode or manual mode, the relay J1, the relay J2, the switch K2, the switch K3 and the switch K4 are connected in parallel, the indicator lamp LP is connected in series with the relay J1, the motor M1 and the motor M2 are connected in parallel and are used for controlling the smoke machine to work, and the capacitor C2 and the capacitor C3 are connected in series.
5. The automatic flue gas gas turbine control circuit according to claim 3, wherein The alarm circuit comprises an audio integrated circuit IC, a speaker SP, a resistor assembly, an inverter F1, an inverter F2, an inverter F3, an inverter F4, a diode D9, a diode D10, a resistor R2 and a resistor R3, the resistor assembly comprises a variable resistor W2, a variable resistor W3, a thermistor Rt and a photosensitive resistor cds, the speaker SP is connected with an audio output end of the audio integrated circuit IC, an audio input end of the audio integrated circuit IC is connected with an emitter of a transistor T1, the variable resistor W2 is connected with the thermistor Rt in parallel, the inverter F1 is connected with the diode D9 in series, the photosensitive resistor cds is connected with the variable resistor W3 in parallel, the inverter F2 is connected with the diode D10 in series, the inverter F3 is connected with the resistor R2 in series, and the inverter F4 is connected with the resistor R3 in series.
6. The automatic flue gas gas turbine control circuit according to claim 5, wherein The potentiometer Rp is connected with the variable resistor W1, and the resistor R4 is connected with an audio input end of the audio integrated circuit IC.