CN110208153A - Sensor circuit for range hood and range hood with sensor circuit - Google Patents
Sensor circuit for range hood and range hood with sensor circuit Download PDFInfo
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- CN110208153A CN110208153A CN201810863736.XA CN201810863736A CN110208153A CN 110208153 A CN110208153 A CN 110208153A CN 201810863736 A CN201810863736 A CN 201810863736A CN 110208153 A CN110208153 A CN 110208153A
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention discloses a sensor circuit for a range hood, which comprises an infrared receiving module, a differential amplifying module and a control module, wherein one end of the infrared receiving module is connected with a power supply, and the other end of the infrared receiving module is connected with the differential amplifying module; one end of the DA conversion module is connected with the processor, and the other end of the DA conversion module is connected with the differential amplification module; the input end of the differential amplification module is respectively connected with the infrared receiving module and the DA conversion module, and the automatic zero setting function is achieved; the processor is connected with the DA conversion module; a range hood is also disclosed. The zero adjusting circuit is adjusted in real time by outputting a DA signal of the DA conversion module; when infrared receiving module receives ambient light or temperature influence, can adjust zero point through output DA signal, make the output signal deviation of circuit little, make it better reaction detection concentration.
Description
Technical field
The invention belongs to kitchen ventilator control technology fields, and in particular to a kind of sensor circuit and its oil for kitchen ventilator
Smoke machine.
Background technique
Traditional zeroing circuit is usually fixed zeroing, this is to by the infrared receiving tube of environment light and ambient temperature effect
Inadequate, different environment light and environment temperature will affect infrared receiving tube and export different electric currents, to make fixed zeroing
Method loses meaning；When infrared receiving tube is influenced by environment light and environment temperature, it is dense to oil smoke infrared receiving tube to be reduced
The detection range of degree is allowed to that due detection range is not achieved, to influence detection effect.
Summary of the invention
In view of this, the main purpose of the present invention is to provide sensor circuits and its kitchen ventilator for kitchen ventilator.
In order to achieve the above objectives, the technical scheme of the present invention is realized as follows:
The embodiment of the present invention provides a kind of sensor circuit for kitchen ventilator, including infrared receiving module, DA modulus of conversion
Block, differential amplification module, processor；
The infrared receiving module, one end connect to power supply, and the other end is connect with differential amplification module, for acquiring resistance
Voltage and be sent to differential amplification module, whether the environment light or environment temperature for being also used to detect current environment change
And it is sent to processor；
The D/A conversion module, one end are connect with processor, and the other end is connect with differential amplification module, are used for infrared receiver
When module detects that the environment light of current environment or environment temperature change, output DA signal to differential amplification module；
The input terminal of the differential amplification module is connect with infrared receiving module, D/A conversion module respectively, for connecing respectively
The voltage and DA signal for receiving acquisition resistance, will export after the voltage amplification for acquiring resistance, generate zeroing letter according to the DA signal
Number and export the zeroed signal；
The processor, connect with D/A conversion module, for infrared receiving module detect current environment environment light or
When environment temperature changes, control signal is sent to D/A conversion module.
In above scheme, the infrared receiving module includes infrared receiving tube J1, first resistor R1, thermistor RZ,
Power supply is accessed in one end of ten resistance R10, the infrared receiving tube J1, and the other end is grounded by first resistor R1；The temperature-sensitive electricity
It hinders the one end RZ and connects power supply, the other end is grounded by the tenth resistance R10 and first resistor R1, the electricity of the thermistor RZ and the tenth
Processor is connected between resistance R10.
It further include reserved resistance R3 in above scheme, the one end reserved resistance R3 ground connection, an end is connected to infrared receiving
Between block, differential amplification module.
In above scheme, the differential amplification module includes second level differential amplifier circuit, the 4th resistance R4, the 5th resistance
R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9；The first of the second level differential amplifier circuit is negative defeated
Entering end to connect through the 4th resistance R4 with D/A conversion module, the first positive input terminal is connect through second resistance R2 with infrared receiving module,
First output end is connected between the 4th resistance R4 and the first negative input end by the 5th resistance R5；The second level differential amplifier circuit
The second negative input end be connected to second output terminal through the 7th resistance R7, the first positive input terminal is connected to the 5th resistance through the 6th resistance R6
Between the first output end, mono- end the 8th resistance R8 is connected between second output terminal and the 7th resistance R7, another to be terminated at
Processor, mono- end the 9th resistance R9 are connected between the second negative input end and the 7th resistance R7, other end ground connection.
In above scheme, the differential amplification module includes second level differential amplifier circuit, the 4th resistance R4, the 5th resistance
R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9, voltage follower U4A；The second level differential amplification
First negative input end of circuit is connect through the 4th resistance R4 with D/A conversion module, and the first positive input terminal is through second resistance R2, voltage
Follower U4A is connect with infrared receiving module, and to be connected to the 4th resistance R4 and first negative defeated by the 5th resistance R5 for the first output end
Enter between end；Second negative input end of the second level differential amplifier circuit is connected to second output terminal through the 7th resistance R7, and first just
Input terminal is connected between the 5th resistance and the first output end through the 6th resistance R6, and mono- end the 8th resistance R8 is connected to the second output
Between end and the 7th resistance R7, another to be terminated at processor, mono- end the 9th resistance R9 is connected to the second negative input end and the 7th
Between resistance R7, other end ground connection.
In above scheme, the differential amplification module includes second level differential amplifier circuit, the 4th resistance R4, the 5th resistance
R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9, the tenth resistance R10, grid resistance RG, voltage with
With device U4A；First negative input end of the second level differential amplifier circuit is through the 4th resistance R4, grid resistance RG and the second negative input
End connection, the first positive input terminal are connect through second resistance R2 with infrared receiving module, and the first output end connects by 3rd resistor R3
Between the first negative input end and grid resistance RG；First positive input terminal of the second level differential amplifier circuit is through the tenth resistance
R10 is connected between grid resistance RG and the second negative input end in processor, second output terminal through the 5th resistance R5, the 4th electricity
Resistance mono- end R4 is connected between the first output end and 3rd resistor R3, another the first positive input terminal for being terminated at voltage follower U4A,
Mono- end 6th resistance R6 is connected between second output terminal and the 5th resistance R5, another to be terminated at the of voltage follower U4A
One negative input end, the output end of the voltage follower U4A connect processor all the way, and another way is connected to the 6th electricity through the 7th resistance R7
Between the first negative input end for hindering R6 and voltage follower U4A.
The embodiment of the present invention also provides any one in a kind of kitchen ventilator, including kitchen ventilator ontology, turbine and such as above scheme
Sensor circuit described in, turbine is arranged on the kitchen ventilator ontology, and the sensing is arranged in the edge air inlet of the turbine
Device circuit.
Compared with prior art, the present invention adjusts zeroing circuit by the DA signal of output D/A conversion module in real time；It is hot
When outer receiving module is influenced by environment light or temperature, the output signal of circuit can be kept inclined by exporting DA Signal Regulation zero point
It is poor little, it is allowed to better reaction detection concentration.
Detailed description of the invention
Fig. 1 provides a kind of connection block diagram of sensor circuit for kitchen ventilator for the embodiment of the present invention；
Fig. 2 is that the embodiment of the present invention 1 provides a kind of circuit diagram of sensor circuit for kitchen ventilator；
Fig. 3 is that the embodiment of the present invention 2 provides a kind of circuit diagram of sensor circuit for kitchen ventilator；
Fig. 4 is that the embodiment of the present invention 3 provides a kind of circuit diagram of sensor circuit for kitchen ventilator；
Fig. 5 provides a kind of structural schematic diagram of kitchen ventilator for the embodiment of the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
The embodiment of the present invention provides a kind of sensor circuit for kitchen ventilator, as shown in Figure 1, including infrared receiving module
1, D/A conversion module 2, differential amplification module 3, processor 4；
The infrared receiving module 1, one end are connect with processor 4, and the other end is connect with differential amplification module 3, for adopting
Collect resistance voltage and be sent to differential amplification module 3, be also used to detect current environment environment light or environment temperature whether
It changes and is sent to processor 4；
The D/A conversion module 2, one end are connect with processor 4, and the other end is connect with differential amplification module 3, for infrared
When receiving module 1 detects that the environment light of current environment or environment temperature change, output DA signal to differential amplification module
3；
The input terminal of the differential amplification module 3 is connect with infrared receiving module 1, D/A conversion module 2 respectively, for distinguishing
The voltage and DA signal for receiving acquisition resistance, will export after the voltage amplification for acquiring resistance, are generated and are returned to zero according to the DA signal
Signal and export the zeroed signal；
The processor 4, connect with D/A conversion module 2, and the environment light of current environment is detected for infrared receiving module 1
Or environment temperature sends control signal to D/A conversion module 2 when changing.
The present invention adjusts zeroing circuit by the DA signal of output D/A conversion module 2 in real time；When infrared receiving module 1 is by ring
When border light or temperature influence, the output signal deviation of circuit can be kept little, be allowed to more preferable by exporting DA Signal Regulation zero point
Reaction detection concentration.
Embodiment 1
The embodiment of the present invention 1 provides a kind of sensor circuit for kitchen ventilator, as shown in Fig. 2, including infrared receiving
Block 1, D/A conversion module 2, differential amplification module 3, processor 4；
The infrared receiving module 1 includes infrared receiving tube J1, first resistor R1, thermistor RZ, the tenth resistance R10,
Power supply is accessed in one end of the infrared receiving tube J1, and the other end is grounded by first resistor R1；The one end the thermistor RZ connects
Power supply is connect, the other end is grounded by the tenth resistance R10 and first resistor R1, between the thermistor RZ and the tenth resistance R10
Connect processor 4.
The D/A conversion module includes DA chip, the model AD5320 that the DA can be used.
It further, further include reserved resistance R3, the one end reserved resistance R3 ground connection, an end is connected to infrared receiving module
1, between differential amplification module 3, convenient for detection ground resistance.
The differential amplification module 3 includes second level differential amplifier circuit, the 4th resistance R4, the 5th resistance R5, the 6th resistance
R6, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9；First negative input end of the second level differential amplifier circuit is through the 4th
Resistance R4 is connect with D/A conversion module 2, and the first positive input terminal is connect through second resistance R2 with infrared receiving module 1, the first output
End is connected between the 4th resistance R4 and the first negative input end by the 5th resistance R5；The second of the second level differential amplifier circuit is negative
Input terminal is connected to second output terminal through the 7th resistance R7, and the first positive input terminal is connected to the 5th resistance and first defeated through the 6th resistance R6
Between outlet, mono- end the 8th resistance R8 is connected between second output terminal and the 7th resistance R7, another to be terminated at processor 4,
Mono- end 9th resistance R9 is connected between the second negative input end and the 7th resistance R7, other end ground connection.
The output signal of the infrared receiving tube J1 is obtained by acquiring the voltage of sample resistance, sample resistance electricity
Pressure is amplified by differential amplifier circuit, is finally output to A/D chip；
Automatic zero set function is the DA signal balancing by D/A conversion module 2, when environment light or temperature make infrared receiving tube
Initial voltage variation when, then by processor 4 control DA chip export a relevant voltage to differential amplifier circuit, make circuit
Output signal is restored to target value, to achieve the purpose that zeroing；
The environment temperature to obtain infrared receiving tube J1 is divided by thermistor RZ.
The differential amplifier circuit is amplified using two-stage, and the first order is differential amplification, and the second level is conventional voltage amplification, such as
Fruit design requirement allows, and uses level-one amplification can also be with；Automatic zero set function realizes that difference is put according to differential amplifier circuit
Big circuit formula:
Without reserved resistance R3
There is reserved resistance R3
Wherein, U0 is output voltage, U1 is detection infrared tube signal voltage, U2 is zeroing infrared tube zeroing voltage；Without pre-
It stays resistance formula to be suitable for ignore the shunting of reserved resistance, there is reserved resistance formula to be suitable for point of negligible reserved resistance
Stream.When environment light or environment temperature change, the voltage U1 of infrared tube becomes larger or becomes smaller, and the U0 that single-chip microcontroller is read can also become
Greatly or become smaller, is made at this time by the voltage that single-chip microcontroller controls to adjust U2Initial value is near 0, at the beginning of finally making U0
It is little to be worth deviation, to achieve the purpose that automatic zero set.
Embodiment 2
The embodiment of the present invention 2 provides a kind of sensor circuit for kitchen ventilator, as shown in figure 3, including infrared receiving
Block 1, D/A conversion module 2, differential amplification module 3, processor 4；
The infrared receiving module 1 includes infrared receiving tube J1, first resistor R1, thermistor RZ, the tenth resistance R10,
Power supply is accessed in one end of the infrared receiving tube J1, and the other end is grounded by first resistor R1；The one end the thermistor RZ connects
Power supply is connect, the other end is grounded by the tenth resistance R10 and first resistor R1, between the thermistor RZ and the tenth resistance R10
Connect processor 4.
The D/A conversion module includes DA chip, the model AD5320 that the DA can be used.
It further, further include reserved resistance R3, the one end reserved resistance R3 ground connection, an end is connected to infrared receiving module
1, between differential amplification module 3, convenient for detection ground resistance.
The differential amplification module 3 includes second level differential amplifier circuit, the 4th resistance R4, the 5th resistance R5, the 6th resistance
R6, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9, voltage follower U4A；The first of the second level differential amplifier circuit
Negative input end is connect through the 4th resistance R4 with D/A conversion module 2, and the first positive input terminal is through second resistance R2, voltage follower U4A
It is connect with infrared receiving module 1, the first output end is connected between the 4th resistance R4 and the first negative input end by the 5th resistance R5；
Second negative input end of the second level differential amplifier circuit is connected to second output terminal through the 7th resistance R7, and the first positive input terminal is through
Six resistance R6 are connected between the 5th resistance and the first output end, and mono- end the 8th resistance R8 is connected to second output terminal and the 7th electricity
Hinder between R7, it is another to be terminated at processor 4, mono- end the 9th resistance R9 be connected to the second negative input end and the 7th resistance R7 it
Between, other end ground connection.
The output signal of the infrared receiving tube J1 is obtained by acquiring the voltage of sample resistance, sample resistance electricity
Pressure is amplified by differential amplifier circuit, is finally output to A/D chip；
Automatic zero set function is the DA signal balancing by D/A conversion module 2, when environment light or temperature make infrared receiving tube
Initial voltage variation when, then by processor 4 control DA chip export a relevant voltage to differential amplifier circuit, make circuit
Output signal is restored to target value, to achieve the purpose that zeroing；
The environment temperature to obtain infrared receiving tube J1 is divided by thermistor RZ.
The differential amplifier circuit is amplified using two-stage, and the first order is differential amplification, and the second level is conventional voltage amplification, such as
Fruit design requirement allows, and uses level-one amplification can also be with；Automatic zero set function realizes that difference is put according to differential amplifier circuit
Big circuit formula:
Wherein, U0 is output voltage, U1 is detection infrared tube signal voltage, U2 is zeroing infrared tube zeroing voltage；Environment
When light or environment temperature change, the voltage U1 of infrared tube can become larger or become smaller, the U0 that single-chip microcontroller is read can also become larger or
Become smaller, is made at this time by the voltage that single-chip microcontroller controls to adjust U2Initial value finally makes U0 initial value 0 near 0
Near, to achieve the purpose that automatic zero set.
Embodiment 3
The embodiment of the present invention 3 provides a kind of sensor circuit for kitchen ventilator, as shown in figure 4, including infrared receiving
Block 1, D/A conversion module 2, differential amplification module 3, processor 4；
The infrared receiving module 1 includes infrared receiving tube J1, first resistor R1, thermistor RZ, the tenth resistance R10,
Power supply is accessed in one end of the infrared receiving tube J1, and the other end is grounded by first resistor R1；The one end the thermistor RZ connects
Power supply is connect, the other end is grounded by the tenth resistance R10 and first resistor R1, between the thermistor RZ and the tenth resistance R10
Connect processor 4.
The D/A conversion module includes DA chip, the model AD5320 that the DA can be used.
It further, further include reserved resistance R3, the one end reserved resistance R3 ground connection, an end is connected to infrared receiving module
1, between differential amplification module 3, convenient for detection ground resistance.
The differential amplification module 3 includes second level differential amplifier circuit, the 4th resistance R4, the 5th resistance R5, the 6th resistance
R6, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9, the tenth resistance R10, grid resistance RG, voltage follower U4A；It is described
First negative input end of second level differential amplifier circuit is connect through the 4th resistance R4, grid resistance RG with the second negative input end, and first
Positive input terminal is connect through second resistance R2 with infrared receiving module 1, and to be connected to first negative defeated by 3rd resistor R3 for the first output end
Enter between end and grid resistance RG；First positive input terminal of the second level differential amplifier circuit is through the tenth resistance R10 in processor
4, second output terminal is connected between grid resistance RG and the second negative input end through the 5th resistance R5, the 4th resistance R4 mono- termination
Between the first output end and 3rd resistor R3, another the first positive input terminal for being terminated at voltage follower U4A, the 6th electricity
Resistance mono- end R6 is connected between second output terminal and the 5th resistance R5, another the first negative input end for being terminated at voltage follower U4A,
The output end of the voltage follower U4A connects processor 4 all the way, and another way is connected to the 6th resistance R6 and voltage through the 7th resistance R7
Between the first negative input end of follower U4A.
The output signal of the infrared receiving tube J1 is obtained by acquiring the voltage of sample resistance, sample resistance electricity
Pressure is amplified by differential amplifier circuit, is finally output to A/D chip；
Automatic zero set function is the DA signal balancing by D/A conversion module 2, when environment light or temperature make infrared receiving tube
Initial voltage variation when, then by processor 4 control DA chip export a relevant voltage to differential amplifier circuit, make circuit
Output signal is restored to target value, to achieve the purpose that zeroing；
The environment temperature to obtain infrared receiving tube J1 is divided by thermistor RZ.
The differential amplifier circuit is amplified using two-stage, and the first order is differential amplification, and the second level is conventional voltage amplification, such as
Fruit design requirement allows, and uses level-one amplification can also be with；Automatic zero set function realizes that difference is put according to differential amplifier circuit
Big circuit formula:
Wherein, U0 is output voltage, U1 is detection infrared tube signal voltage, U2 is zeroing infrared tube zeroing voltage；Environment
When light and environment temperature change, the U1 of infrared tube can become larger or become smaller, and the U0 that single-chip microcontroller is read also can become larger or become smaller,
Make (U1-U2) initial value near 0 by the voltage that single-chip microcontroller controls to adjust U2 at this time, makes U0 initial value near 0, finally to reach
To the purpose of automatic zero set.
In the embodiment 1-3, processor 4 is not limited to auspicious Sa single-chip microcontroller, is also possible to STM32, PIC, AVR, flies to think card
You etc., may be implemented the single-chip microcontroller of this requirement.
The voltage and zeroed signal of the sample resistance of D/A conversion module output amplification are to A/D chip, the A/D chip
It can integrate in processor 4, standalone module can also be used, if A/D chip uses standalone module, it is also necessary to pass through communication
Agreement sends a signal to processor 4.
The embodiment of the present invention also provides a kind of kitchen ventilator, as shown in figure 5, including kitchen ventilator ontology 5, turbine 6 and embodiment
Turbine 6, the edge air inlet of the turbine 6 are arranged on the kitchen ventilator ontology 5 for sensor circuit described in any one of 1-3
The sensor circuit is arranged in place.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the scope of the present invention.
Claims (7)
1. a kind of sensor circuit for kitchen ventilator, which is characterized in that including infrared receiving module (1), D/A conversion module
(2), differential amplification module (3), processor (4)；
The infrared receiving module (1), one end connects to power supply, and the other end is connect with differential amplification module (3), for acquiring electricity
It the voltage of resistance and is sent to differential amplification module (3), whether the environment light or environment temperature for being also used to detect current environment are sent out
Changing and it is sent to processor (4)；
The D/A conversion module (2), one end are connect with processor (4), and the other end is connect with differential amplification module (3), for red
When outer receiving module (1) detects that the environment light of current environment or environment temperature change, output DA signal to differential amplification
Module (3)；
The input terminal of the differential amplification module (3) is connect with infrared receiving module (1), D/A conversion module (2) respectively, for dividing
The voltage and DA signal that resistance Jie Shou not acquired will export after the voltage amplification for acquiring resistance, are generated and adjusted according to the DA signal
Zero-signal and export the zeroed signal；
The processor (4), connect with D/A conversion module (2), and the environment of current environment is detected for infrared receiving module (1)
When light or environment temperature change, control signal is sent to D/A conversion module (2).
2. the sensor circuit according to claim 1 for kitchen ventilator, which is characterized in that the infrared receiving module
It (1) include infrared receiving tube J1, first resistor R1, thermistor RZ, the tenth resistance R10, one end of the infrared receiving tube J1
Power supply is accessed, the other end is grounded by first resistor R1；The one end the thermistor RZ connects power supply, and the other end is by the tenth electricity
It hinders R10 and first resistor R1 to be grounded, connects processor (4) between the thermistor RZ and the tenth resistance R10.
3. the sensor circuit according to claim 1 or 2 for kitchen ventilator, which is characterized in that further include reserved resistance
R3, the one end reserved resistance R3 ground connection, an end is connected between infrared receiving module (1), differential amplification module (3).
4. the sensor circuit according to claim 3 for kitchen ventilator, which is characterized in that the differential amplification module
It (3) include second level differential amplifier circuit, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance
R8, the 9th resistance R9；First negative input end of the second level differential amplifier circuit connects through the 4th resistance R4 and D/A conversion module (2)
It connects, the first positive input terminal is connect through second resistance R2 with infrared receiving module (1), and the first output end is connected to by the 5th resistance R5
Between 4th resistance R4 and the first negative input end；Second negative input end of the second level differential amplifier circuit connects through the 7th resistance R7
In second output terminal, the first positive input terminal is connected between the 5th resistance and the first output end through the 6th resistance R6, the 8th electricity
Resistance mono- end R8 is connected between second output terminal and the 7th resistance R7, another to be terminated at processor (4), one end the 9th resistance R9
It is connected between the second negative input end and the 7th resistance R7, other end ground connection.
5. the sensor circuit according to claim 3 for kitchen ventilator, which is characterized in that the differential amplification module
It (3) include second level differential amplifier circuit, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance
R8, the 9th resistance R9, voltage follower U4A；First negative input end of the second level differential amplifier circuit through the 4th resistance R4 with
D/A conversion module (2) connection, the first positive input terminal connect through second resistance R2, voltage follower U4A and infrared receiving module (1)
It connects, the first output end is connected between the 4th resistance R4 and the first negative input end by the 5th resistance R5；The second level differential amplification
Second negative input end of circuit is connected to second output terminal through the 7th resistance R7, and the first positive input terminal is connected to the 5th through the 6th resistance R6
Between resistance and the first output end, mono- end the 8th resistance R8 is connected between second output terminal and the 7th resistance R7, the other end
It is connected to processor (4), mono- end the 9th resistance R9 is connected between the second negative input end and the 7th resistance R7, other end ground connection.
6. the sensor circuit according to claim 3 for kitchen ventilator, which is characterized in that the differential amplification module
It (3) include second level differential amplifier circuit, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance
R8, the 9th resistance R9, the tenth resistance R10, grid resistance RG, voltage follower U4A；The first of the second level differential amplifier circuit
Negative input end is connect through the 4th resistance R4, grid resistance RG with the second negative input end, the first positive input terminal through second resistance R2 with
Infrared receiving module (1) connection, the first output end are connected between the first negative input end and grid resistance RG by 3rd resistor R3；
First positive input terminal of the second level differential amplifier circuit is through the tenth resistance R10 in processor (4), and second output terminal is through the 5th electricity
Resistance R5 is connected between grid resistance RG and the second negative input end, and mono- end the 4th resistance R4 is connected to the first output end and third electricity
It hinders between R3, another the first positive input terminal for being terminated at voltage follower U4A, mono- end the 6th resistance R6 is connected to the second output
Between end and the 5th resistance R5, another the first negative input end for being terminated at voltage follower U4A, the voltage follower U4A's
Output end connects processor (4) all the way, another way through the 7th resistance R7 be connected to the 6th resistance R6 and voltage follower U4A it is first negative
Between input terminal.
7. a kind of kitchen ventilator, which is characterized in that including kitchen ventilator ontology (5), turbine (6) and the biography as described in claim 1-6
Turbine (6) are arranged on the kitchen ventilator ontology (5) in sensor circuit, and the sensor is arranged in the edge air inlet of the turbine (8)
Circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810863736.XA CN110208153A (en) | 2018-08-01 | 2018-08-01 | Sensor circuit for range hood and range hood with sensor circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810863736.XA CN110208153A (en) | 2018-08-01 | 2018-08-01 | Sensor circuit for range hood and range hood with sensor circuit |
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| CN110208153A true CN110208153A (en) | 2019-09-06 |
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| CN201810863736.XA Pending CN110208153A (en) | 2018-08-01 | 2018-08-01 | Sensor circuit for range hood and range hood with sensor circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110579431A (en) * | 2019-09-17 | 2019-12-17 | 宁波科赛迪电子科技有限公司 | Self-adaptive dimmer and dimming measuring method thereof |
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