CN105404212A - Smoke ventilator intelligent control system based on low-pass filtering application circuit - Google Patents
Smoke ventilator intelligent control system based on low-pass filtering application circuit Download PDFInfo
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- CN105404212A CN105404212A CN201510955519.XA CN201510955519A CN105404212A CN 105404212 A CN105404212 A CN 105404212A CN 201510955519 A CN201510955519 A CN 201510955519A CN 105404212 A CN105404212 A CN 105404212A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0428—Safety, monitoring
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/26—Pc applications
- G05B2219/2613—Household appliance in general
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/26—Pc applications
- G05B2219/2614—HVAC, heating, ventillation, climate control
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- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Fire Alarms (AREA)
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.
Description
Technical field
The present invention relates to a kind of control system of smoke exhaust ventilator, specifically refer to a kind of intelligent control system of kitchen ventilator based on low-pass filtering amplifying circuit.
Background technology
The smoke exhaust ventilator of current domestic production, sale is all have keyswitch, to operate smoke exhaust ventilator, and the keyswitch of this smoke exhaust ventilator in use easily occurs the problems such as inefficacy, sensitivity decrease.And people usually there will be after a procedure and forget closedown smoke exhaust ventilator, therefore cause the waste that the energy is a large amount of.
Therefore, people are badly in need of a kind ofly to control according to the concentration of oil smoke the control system of cooking fume exhauster that smoke exhaust ventilator automatically opens or cut out now, realize convenient, environmental protection, energy-conservation requirement.
Summary of the invention
The object of the invention is to overcome smoke exhaust ventilator of the prior art and can not control according to the concentration of oil smoke the defect that smoke exhaust ventilator automatically opens or cut out, the invention provides a kind of intelligent control system of kitchen ventilator based on low-pass filtering amplifying circuit.
The present invention is achieved through the following technical solutions: a kind of intelligent control system of kitchen ventilator based on low-pass filtering amplifying circuit, primarily of central processing unit, power supply, the A/D analog to digital converter, motor, the alarm that are all connected with central processing unit, the smoke transducer be connected with A/D analog to digital converter, and be serially connected in the three-terminal voltage-stabilizing filtering circuit composition between power supply and central processing unit.Meanwhile, between smoke transducer and A/D analog to digital converter, low-pass filtering amplifying circuit is also serially connected with; Described low-pass filtering amplifying circuit is then by the signal filter circuit be connected with smoke transducer, and the signal amplification circuit be connected with signal filter circuit forms; The output terminal of described signal amplification circuit is connected with A/D analog to digital converter.
Described signal filter circuit is by triode VT5, diode D8, P pole is connected with the N pole of diode D8 after resistance R9 through polar capacitor C6 in turn, the diode D7 that N pole is connected with the collector of triode VT5 after resistance R10, negative pole is connected with the P pole of diode D8 after resistance R11, the polar capacitor C7 that positive pole is connected with the base stage of triode VT, and positive pole is connected with the P pole of diode D8, negative pole jointly forms the output terminal of signal filter circuit and the polar capacitor C8 be connected with signal amplification circuit forms through resistance R14 in turn after resistance R15 with the emitter of triode VT5, the N pole of described diode D7 as signal filter circuit input end and be connected with smoke transducer.
Described signal amplification circuit is by amplifier P2, triode VT4, diode D11, one end is connected with the emitter of triode VT5, the resistance R13 that the other end is connected with the base stage of triode VT4, P pole is connected with the negative pole of amplifier P2 after polar capacitor C9, the diode D9 that N pole is connected with the emitter of triode VT5 after resistance R12, negative pole is connected with the emitter of triode VT4 after resistance R16, positive pole is in turn through polar capacitor C10 that resistance R18 is connected with the P pole of diode D11 after resistance R20, N pole is connected with the P pole of diode D9 after resistance R17, P pole is in turn through diode D10 that resistance R19 is connected with the N pole of diode D11 after polar capacitor C5, negative pole is connected with the output terminal of amplifier P2, the polar capacitor C11 that positive pole is connected as the output terminal of signal amplification circuit and with A/D analog to digital converter after resistance R8, and one end is connected with the positive pole of polar capacitor C11, the resistance R21 that the other end is connected with the N pole of diode D1 forms, the grounded collector of described triode VT4, the positive pole of described amplifier P2 is connected with the negative pole of polar capacitor C8 after resistance R14 through resistance R15.
Described three-terminal voltage-stabilizing filtered electrical routing transformer T, the diode rectifier U that one of them input end is connected with the Same Name of Ends of the secondary inductance coil of transformer T, its another input end is connected with the non-same polarity of the secondary inductance coil of transformer T, the polar capacitor C1 that positive pole is connected with the cathode output end of diode rectifier U, negative pole is connected with the cathode output end of diode rectifier U, and the adjustable mu balanced circuit of the voltage that input end is all connected with cathode output end with the cathode output end of diode rectifier U, its output terminal is connected with single-chip microcomputer forms; The Same Name of Ends of the former limit telefault of described transformer T is connected with power supply with the input end that non-same polarity forms three-terminal voltage-stabilizing filtering circuit jointly.
Described voltage is adjustable mu balanced circuit is by amplifier P1, triode VT1, triode VT2, triode VT3, positive pole is connected with the cathode output end of diode rectifier U after resistance R1, the polar capacitor C2 that negative pole is connected with the base stage of triode VT1, P pole is connected with the cathode output end of diode rectifier U after resistance R2 through resistance R3 in turn, the diode D4 that N pole is connected with the base stage of triode VT3, P pole is connected with the positive pole of polar capacitor C2 after resistance R4, the diode D2 that N pole is connected with the collector of triode VT2, P pole is connected with the emitter of triode VT1 after adjustable resistance R5, the diode D3 that N pole is connected with the electrode input end of amplifier P1, positive pole is connected with the base stage of triode VT2, the polar capacitor C3 that negative pole is connected with the electrode input end of amplifier P1, positive pole is connected with the negative input of amplifier P1, the polar capacitor C4 that negative pole is connected with the emitter of triode VT3, P pole is connected with the output terminal of amplifier P1, the diode D5 that N pole is connected with the emitter of triode VT2 after resistance R6, and P pole is connected with the output terminal of amplifier P1 after resistance R7, the diode D6 of the output terminal of the adjustable mu balanced circuit of the common coating-forming voltage of collector of N pole and triode VT3 forms, described triode VT1 grounded collector.
For guaranteeing practical effect of the present invention, described smoke transducer preferentially adopts JTY-GD-T12 type smoke transducer to realize.
The present invention compared with prior art has the following advantages and beneficial effect:
(1) low-pass filtering amplifying circuit of the present invention can filter the smokescope signal of smoke transducer transmission, and can the trap in signal be eliminated, signal after process is carried out amplifying rear output simultaneously, therefore, ensure that A/D analog to digital converter receives signal accurately.
Ensure that the current signal of signal processing module stable output,
(2) three-terminal voltage-stabilizing rectification amplifying circuit of the present invention can carry out rectifying and wave-filtering to supply voltage, can also be stable 12V DC voltage by the voltage transitions after rectifying and wave-filtering, thus guarantee the stability of central processing unit work, ensure that the stability of the control system of intelligent fume exhauster of the present invention simultaneously.
(3) present invention employs smoke transducer, the stable performance of this smoke transducer, the scope of Information Monitoring is wide, can accurately gather the concentration of the smog in acquisition range, thus the control system that improve intelligent fume exhauster of the present invention can accurately control smoke exhaust ventilator automatically opens or close.
(4) control system of intelligent fume exhauster of the present invention, makes smoke exhaust ventilator achieve robotization and opens and closes, save spending, and can substantially increase the useful life of smoke exhaust ventilator, reduce use cost to family.
Accompanying drawing explanation
Fig. 1 is one-piece construction figure of the present invention.
Fig. 2 is the electrical block diagram of three-terminal voltage-stabilizing filtering circuit of the present invention.
Fig. 3 is the electrical block diagram of low-pass filtering amplifying circuit of the present invention.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
As shown in Figure 1, the present invention is primarily of central processing unit, power supply, the A/D analog to digital converter, motor, the alarm that are all connected with central processing unit, the smoke transducer be connected with A/D analog to digital converter, be serially connected in the three-terminal voltage-stabilizing filtering circuit between power supply and central processing unit, and the low-pass filtering amplifying circuit be serially connected between smoke transducer and A/D analog to digital converter forms.Wherein, as shown in Figure 2, it is by transformer T, diode rectifier U for this three-terminal voltage-stabilizing filtering circuit, and the adjustable mu balanced circuit composition of voltage.
Wherein, an input end of diode rectifier U is connected with the Same Name of Ends of the secondary inductance coil of transformer T, its another input end is connected with the non-same polarity of the secondary inductance coil of transformer T.The positive pole of polar capacitor C1 is connected with the cathode output end of diode rectifier U, negative pole is connected with the cathode output end of diode rectifier U.The input end of voltage is adjustable mu balanced circuit is all connected with cathode output end with the cathode output end of diode rectifier U, its output terminal is connected with single-chip microcomputer.The Same Name of Ends of the former limit telefault of described transformer T is connected with power supply with the input end that non-same polarity forms three-terminal voltage-stabilizing filtering circuit jointly.
For guaranteeing reliability service of the present invention, described central processing unit preferentially adopts SOP8 central processing unit, and the MULT pin of this SOP8 central processing unit is connected with A/D analog to digital converter, and ZCD pin is connected with motor, the alarm that SE pin is connected.Described power supply is 220V alternating current, and this 220V alternating current carries out the 12V DC voltage of stable output after rectifying and wave-filtering by three-terminal voltage-stabilizing filtering circuit, and this 12V DC voltage is that central processing unit is powered.
As shown in Figure 2, this voltage is adjustable mu balanced circuit by amplifier P1, triode VT1, triode VT2, triode VT3, resistance R1, resistance R2, resistance R3, resistance R4, adjustable resistance R5, resistance R6, resistance R7, polar capacitor C2, polar capacitor C3, polar capacitor C4, diode D2, diode D3, diode D4, diode D5, and diode D6 forms.
During connection, the positive pole of polar capacitor C2 is connected with the cathode output end of diode rectifier U after resistance R1, negative pole is connected with the base stage of triode VT1.The P pole of diode D4 is connected with the cathode output end of diode rectifier U after resistance R2 through resistance R3 in turn, N pole is connected with the base stage of triode VT3.The P pole of diode D2 is connected with the positive pole of polar capacitor C2 after resistance R4, N pole is connected with the collector of triode VT2.The P pole of diode D3 is connected with the emitter of triode VT1 after adjustable resistance R5, N pole is connected with the electrode input end of amplifier P1.
Wherein, the positive pole of polar capacitor C3 is connected with the base stage of triode VT2, negative pole is connected with the electrode input end of amplifier P1.The positive pole of polar capacitor C4 is connected with the negative input of amplifier P1, negative pole is connected with the emitter of triode VT3.The P pole of diode D5 is connected with the output terminal of amplifier P1, N pole is connected with the emitter of triode VT2 after resistance R6.The P pole of diode D6 is connected with the output terminal of amplifier P1 after resistance R7, the output terminal of the adjustable mu balanced circuit of the common coating-forming voltage of collector of N pole and triode VT3.Described triode VT1 grounded collector.
The present invention operationally, 220V power supply carries out generating 12V alternating current after step-down through transformer T, this 12V alternating current is converted to 12V DC voltage after diode rectifier U rectification, 12V DC voltage obtains level and smooth 12V DC voltage after filtering polar capacitor C1 carries out filtering, the 12V DC voltage of this DC voltage stable output after the adjustable mu balanced circuit of voltage carries out high pressure and low pressure regulates.
As shown in Figure 3, it is by the signal filter circuit be connected with smoke transducer for described low-pass filtering amplifying circuit, and the signal amplification circuit be connected with signal filter circuit forms; Described signal filter circuit by triode VT5, diode D8, resistance R9, resistance R10, resistance R11, resistance R14, resistance R15, polar capacitor C6, polar capacitor C7, polar capacitor C8, diode D7, and diode D8 forms.
During connection, the N pole of diode D7 is connected with the collector of triode VT5 after resistance R10, its P pole is connected with polar capacitor C6 positive pole, and the negative pole of described polar capacitor C6 is connected with the N pole of diode D8 after resistance R9.The negative pole of polar capacitor C7 is connected with the P pole of diode D8 after resistance R11, positive pole is connected with the base stage of triode VT.The positive pole of polar capacitor C8 is connected with the P pole of diode D8, negative pole jointly forms the output terminal of signal filter circuit with the emitter of triode VT5 through resistance R14 in turn and is connected with signal amplification circuit after resistance R15.The N pole of described diode D7 as signal filter circuit input end and be connected with smoke transducer.
Further, described signal amplification circuit by amplifier P2, triode VT4, diode D11, resistance R8, resistance R12, resistance R13, resistance R16, resistance R17, resistance R18, resistance R19, resistance R20, resistance R21, polar capacitor C5, polar capacitor C9, polar capacitor C10, polar capacitor C11, diode D9, diode D10, and diode D11 forms.
During connection, one end of resistance R13 is connected with the emitter of triode VT5, the other end is connected with the base stage of triode VT4.The N pole of diode D9 is connected with the emitter of triode VT5 after resistance R12, its P pole is connected with polar capacitor C9 negative pole, and the positive pole of described polar capacitor C9 is then connected with the negative pole of amplifier P2.The negative pole of polar capacitor C10 is connected with the emitter of triode VT4 after resistance R16, positive pole is connected with the P pole of diode D11 after resistance R20 through resistance R18 in turn.
The N pole of described diode D10 is connected with the P pole of diode D9 after resistance R17, its P pole is connected with polar capacitor C5 negative pole after resistance R19, and the positive pole of described polar capacitor C5 is then connected with the N pole of diode D11.The negative pole of polar capacitor C11 is connected with the output terminal of amplifier P2, positive pole is connected with A/D analog to digital converter as the output terminal of signal amplification circuit after resistance R8.One end of resistance R21 is connected with the positive pole of polar capacitor C11, the other end is connected with the N pole of diode D1.The grounded collector of described triode VT4; The positive pole of described amplifier P2 is connected with the negative pole of polar capacitor C8 after resistance R14 through resistance R15.
The present invention operationally, the smokescope signal of smoke transducer collection is eliminated the harmonic wave in signal through the signal filter circuit of low-pass filtering amplifying circuit, and the signal after signal filter circuit process is transferred to A/D analog to digital converter after being amplified by signal amplification circuit.
During operation, described smoke transducer preferentially adopts JTY-GD-T12 type smoke transducer, and the concentration value signal of the oil smoke collected for gathering the concentration value of oil smoke, and is transferred to A/D analog to digital converter by this smoke transducer after low-pass filtering amplifying circuit.The concentration value of the oil smoke that smoke transducer transmits by described A/D analog to digital converter is converted to data-signal and is transferred to central processing unit.Be set with the least concentration value of oil smoke in described central processing unit, the data-signal received is converted to data value and compares with the least concentration value of oil smoke by this central processing unit.
If the least concentration value alarm device that the data value be converted to is greater than the oil smoke of setting starts to report to the police, meanwhile, central processing unit exports and controls electric current to motor, and this motor obtains electric rear startup, and now smoke exhaust ventilator is started working.The concentration value of the oil smoke collected when smoke transducer is compared through central processing unit, if when being less than the least concentration value of the oil smoke of setting, this central processing unit stops output current, and motor dead electricity, smoke exhaust ventilator quits work.
For guaranteeing reliability service of the present invention, described A/D analog to digital converter preferentially adopts the ADC0809AD analog to digital converter of stable performance, alarm then to have employed to have highly sensitive HARBT-6000-T alarm.
As mentioned above, just the present invention can well be realized.
Claims (7)
1. the intelligent control system of kitchen ventilator based on low-pass filtering amplifying circuit, primarily of central processing unit, power supply, the A/D analog to digital converter, motor, the alarm that are all connected with central processing unit, the smoke transducer be connected with A/D analog to digital converter, and be serially connected in the three-terminal voltage-stabilizing filtering circuit composition between power supply and central processing unit; It is characterized in that, between smoke transducer and A/D analog to digital converter, be also serially connected with low-pass filtering amplifying circuit; Described low-pass filtering amplifying circuit is then by the signal filter circuit be connected with smoke transducer, and the signal amplification circuit be connected with signal filter circuit forms; The output terminal of described signal amplification circuit is connected with A/D analog to digital converter.
2. a kind of intelligent control system of kitchen ventilator based on low-pass filtering amplifying circuit according to claim 1, it is characterized in that, described signal filter circuit is by triode VT5, diode D8, P pole is connected with the N pole of diode D8 after resistance R9 through polar capacitor C6 in turn, the diode D7 that N pole is connected with the collector of triode VT5 after resistance R10, negative pole is connected with the P pole of diode D8 after resistance R11, the polar capacitor C7 that positive pole is connected with the base stage of triode VT, and positive pole is connected with the P pole of diode D8, negative pole jointly forms the output terminal of signal filter circuit and the polar capacitor C8 be connected with signal amplification circuit forms through resistance R14 in turn after resistance R15 with the emitter of triode VT5, the N pole of described diode D7 as signal filter circuit input end and be connected with smoke transducer.
3. a kind of intelligent control system of kitchen ventilator based on low-pass filtering amplifying circuit according to claim 2, it is characterized in that, described signal amplification circuit is by amplifier P2, triode VT4, diode D11, one end is connected with the emitter of triode VT5, the resistance R13 that the other end is connected with the base stage of triode VT4, P pole is connected with the negative pole of amplifier P2 after polar capacitor C9, the diode D9 that N pole is connected with the emitter of triode VT5 after resistance R12, negative pole is connected with the emitter of triode VT4 after resistance R16, positive pole is in turn through polar capacitor C10 that resistance R18 is connected with the P pole of diode D11 after resistance R20, N pole is connected with the P pole of diode D9 after resistance R17, P pole is in turn through diode D10 that resistance R19 is connected with the N pole of diode D11 after polar capacitor C5, negative pole is connected with the output terminal of amplifier P2, the polar capacitor C11 that positive pole is connected as the output terminal of signal amplification circuit and with A/D analog to digital converter after resistance R8, and one end is connected with the positive pole of polar capacitor C11, the resistance R21 that the other end is connected with the N pole of diode D1 forms, the grounded collector of described triode VT4, the positive pole of described amplifier P2 is connected with the negative pole of polar capacitor C8 after resistance R14 through resistance R15.
4. a kind of intelligent control system of kitchen ventilator based on low-pass filtering amplifying circuit according to claim 3, it is characterized in that, described three-terminal voltage-stabilizing filtered electrical routing transformer T, one of them input end is connected with the Same Name of Ends of the secondary inductance coil of transformer T, the diode rectifier U that its another input end is connected with the non-same polarity of the secondary inductance coil of transformer T, positive pole is connected with the cathode output end of diode rectifier U, the polar capacitor C1 that negative pole is connected with the cathode output end of diode rectifier U, and input end is all connected with cathode output end with the cathode output end of diode rectifier U, the voltage that its output terminal is connected with single-chip microcomputer is adjustable, and mu balanced circuit forms, the Same Name of Ends of the former limit telefault of described transformer T jointly forms the input end of three-terminal voltage-stabilizing filtering circuit with non-same polarity and is connected with power supply.
5. a kind of intelligent control system of kitchen ventilator based on low-pass filtering amplifying circuit according to claim 4, it is characterized in that, described voltage is adjustable mu balanced circuit is by amplifier P1, triode VT1, triode VT2, triode VT3, positive pole is connected with the cathode output end of diode rectifier U after resistance R1, the polar capacitor C2 that negative pole is connected with the base stage of triode VT1, P pole is connected with the cathode output end of diode rectifier U after resistance R2 through resistance R3 in turn, the diode D4 that N pole is connected with the base stage of triode VT3, P pole is connected with the positive pole of polar capacitor C2 after resistance R4, the diode D2 that N pole is connected with the collector of triode VT2, P pole is connected with the emitter of triode VT1 after adjustable resistance R5, the diode D3 that N pole is connected with the electrode input end of amplifier P1, positive pole is connected with the base stage of triode VT2, the polar capacitor C3 that negative pole is connected with the electrode input end of amplifier P1, positive pole is connected with the negative input of amplifier P1, the polar capacitor C4 that negative pole is connected with the emitter of triode VT3, P pole is connected with the output terminal of amplifier P1, the diode D5 that N pole is connected with the emitter of triode VT2 after resistance R6, and P pole is connected with the output terminal of amplifier P1 after resistance R7, the diode D6 of the output terminal of the adjustable mu balanced circuit of the common coating-forming voltage of collector of N pole and triode VT3 forms, described triode VT1 grounded collector.
6. a kind of intelligent control system of kitchen ventilator based on low-pass filtering amplifying circuit according to claim 5, is characterized in that, described smoke transducer is JTY-GD-T12 type smoke transducer.
7. a kind of intelligent control system of kitchen ventilator based on low-pass filtering amplifying circuit according to claim 6, is characterized in that, described alarm is for having highly sensitive HARBT-6000-T alarm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510955519.XA CN105404212A (en) | 2015-12-16 | 2015-12-16 | Smoke ventilator intelligent control system based on low-pass filtering application circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510955519.XA CN105404212A (en) | 2015-12-16 | 2015-12-16 | Smoke ventilator intelligent control system based on low-pass filtering application circuit |
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| CN105404212A true CN105404212A (en) | 2016-03-16 |
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| CN201510955519.XA Pending CN105404212A (en) | 2015-12-16 | 2015-12-16 | Smoke ventilator intelligent control system based on low-pass filtering application circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109100276A (en) * | 2018-10-11 | 2018-12-28 | 四川尚吕家居科技有限公司 | A kind of oil fume detection system |
| CN109142177A (en) * | 2018-10-11 | 2019-01-04 | 四川尚吕家居科技有限公司 | Oil smoke discharge supervisory systems based on RS232 bus |
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| US20090101849A1 (en) * | 2006-02-17 | 2009-04-23 | Renzhao Wu | Infrared ray generator for photoelectric finger pulse sensor |
| CN104990115A (en) * | 2015-07-06 | 2015-10-21 | 浙江康纳电器有限公司 | Control system and control method for extractor hood with function of kitchen air detection |
| CN105142261A (en) * | 2014-11-29 | 2015-12-09 | 成都颉盛科技有限公司 | Two-pole low-pass filtering and amplifying LED voltage stabilizing system based on linear driving |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2539090Y (en) * | 2002-04-01 | 2003-03-05 | 王春生 | Auto-controlled fume exhaustor |
| US20090101849A1 (en) * | 2006-02-17 | 2009-04-23 | Renzhao Wu | Infrared ray generator for photoelectric finger pulse sensor |
| CN105142261A (en) * | 2014-11-29 | 2015-12-09 | 成都颉盛科技有限公司 | Two-pole low-pass filtering and amplifying LED voltage stabilizing system based on linear driving |
| CN104990115A (en) * | 2015-07-06 | 2015-10-21 | 浙江康纳电器有限公司 | Control system and control method for extractor hood with function of kitchen air detection |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109100276A (en) * | 2018-10-11 | 2018-12-28 | 四川尚吕家居科技有限公司 | A kind of oil fume detection system |
| CN109142177A (en) * | 2018-10-11 | 2019-01-04 | 四川尚吕家居科技有限公司 | Oil smoke discharge supervisory systems based on RS232 bus |
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Application publication date: 20160316 |