CN206431078U - The signal processing circuit of harmful gas sensor - Google Patents
The signal processing circuit of harmful gas sensor Download PDFInfo
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- CN206431078U CN206431078U CN201620968759.3U CN201620968759U CN206431078U CN 206431078 U CN206431078 U CN 206431078U CN 201620968759 U CN201620968759 U CN 201620968759U CN 206431078 U CN206431078 U CN 206431078U
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Abstract
The utility model provides a kind of signal processing circuit of harmful gas sensor, and it includes sensor signal amplifying circuit, digital signal processing circuit, reference voltage generating circuit and electric power management circuit；The reference voltage generating circuit is used for the reference voltage for generating the sensor signal amplifying circuit, the sensor signal amplifying circuit is received and amplifies the electric signal of four electrode harmful gas sensors output, and the electric signal after amplification is sent to the digital signal processing circuit；The digital signal processing circuit converts electrical signals to data signal, and parses according to the data signal concentration value of present harmful gas, then analysis result is sent to external host；The electric power management circuit is used to provide supply voltage to the sensor signal amplifying circuit, the digital signal processing circuit and the reference voltage generating circuit.
Description
Technical field
The utility model is related to a kind of sensor signal processing circuit, specifically, relate to a kind of pernicious gas sensing
The signal processing circuit of device.
Background technology
With the development of the society, the development of science and technology, the mankind increasingly pay attention to the air quality in environment, one in air
A little common gas, such as carbon monoxide, hydrogen sulfide, when content is less than finite concentration, are will not have a negative impact to human body
, but when more than a certain data value, then just have to carry out it effective control, to prevent pernicious gas wound
People's event occurs.In the market for detect high concentration pernicious gas product it is more universal, but for in air, it is low
The pernicious gas product of concentration is but and few, and because the design difficulty of low concentration unwanted Detection Circuit is higher than commonly
Pernicious gas detects circuit, so cost is higher and to develop the same period longer.
In order to solve the problem of above is present, people are seeking a kind of preferable technical solution always.
Utility model content
The purpose of this utility model is in view of the shortcomings of the prior art, so that there is provided a kind of letter of harmful gas sensor
Number process circuit, by that will detect circuit modular, reduces the cost of the equipment using the present invention, is easy to improve and uses this hair
The marketing and application of bright equipment.
To achieve these goals, the technical scheme that the utility model is used is：A kind of letter of harmful gas sensor
Number process circuit, including sensor signal amplifying circuit, digital signal processing circuit, reference voltage generating circuit and power management
Circuit；
The reference voltage generating circuit is used for the reference voltage for generating the sensor signal amplifying circuit, the sensing
Device signal amplification circuit is received and amplifies the electric signal of four electrode harmful gas sensors output, and the electric signal after amplification is sent out
Deliver to the digital signal processing circuit；
The digital signal processing circuit converts electrical signals to data signal, and is parsed and work as according to the data signal
The concentration value of preceding pernicious gas, then analysis result is sent to external host；
The electric power management circuit is used to control the working condition of the digital signal processing circuit and to the sensing
Device signal amplification circuit, the digital signal processing circuit and the reference voltage generating circuit provide supply voltage.
Based on above-mentioned, the electric power management circuit is divided into level sensitive circuit and power supply circuit,
It is 9013 that the level sensitive circuit, which includes triode Q1, the triode Q1, and the base stage of the triode Q1 is led to
Resistance R10 connection 5V positive voltages are crossed, the base stage of the triode Q1 also passes through resistance R11 connections triode Q1 transmitting
Pole, with connecing power supply, the colelctor electrode of the triode Q1 passes through pull-up resistor R8 connections power supply electricity to the emitter stage of the triode Q1
Press VCC, the colelctor electrode also outputs level signals M-POW INFO of the triode Q1；
It is the serial voltage-stablizers of REF333X that the power supply circuit, which includes voltage-stablizer U3, the voltage-stablizer U3, and positive 5V power supplys pass through
With connecing power supply, positive 5V power supplys are also connected with the input pin 1 of the voltage-stablizer U3, the output pin 2 of the voltage-stablizer U3 to electric capacity C6
Connection battery BT1 positive pole and diode D1 anode respectively, the negative pole connection power supply of the battery BT1, the diode
D1 negative electrode output supply voltage VCC, the diode D1 negative electrode pass through resistance R7 output reference voltages Vref-A, described two
Pole pipe D1 negative electrode also connects resistance R9 one end and electric capacity C8 one end respectively by the resistance R7, and the resistance R9's is another
One end and the electric capacity C8 other end connection power supply, the negative electrode of the diode D1 is by electric capacity C7 connection power supplys, institute
Connect publicly with stating power supply.
Based on above-mentioned, the reference voltage generating circuit includes operational amplifier U4C, resistance R31, resistance R35, resistance
R33, resistance R36 and electric capacity C27, the supply voltage VCC are by the electric capacity C27 connections power supply, the supply voltage VCC
By the resistance R31 and the resistance R35 connections power supply, the resistance R31 and the resistance R35 connection end output ginseng
Voltage VrefA, the supply voltage VCC are examined also by the resistance R33 and the resistance R36 connections power supply, the resistance
R33 and resistance R36 connection end output reference voltage VrefB, the resistance R33 and the resistance R36 connection end are also
One end of resistance R34 and resistance R32 one end are connected respectively, and the other end of the resistance R34 connects the resistance R31 and described
Resistance R35 connection end, the other end connection power supply of the resistance R32；
The reference voltage Vref A also passes through resistance R39 connections operational amplifier U4C homophase input pin, institute
The output pin for stating operational amplifier U4 connects the reversed input pin of the operational amplifier U4, the operational amplifier U4's
Output pin also output reference voltage VrefA1.
Based on above-mentioned, it is steady that the sensor signal amplifying circuit includes four electrode harmful gas sensors, sensor output
Determine circuit, signal amplification circuit and switch-off potential balancing circuitry,
Sensor output stabilizing circuit includes first coil LC1, the second coil LC2 and operational amplifier U4A, described
Operational amplifier U4 is LT3012, and the first electrode of the four electrodes harmful gas sensor passes through the first coil LC1, electricity
Resistance R21 connects electric capacity C21 one end and the output end of the operational amplifier U4A, the four electrodes pernicious gas sensing respectively
3rd electrode of device connects the other end of the electric capacity C21 and the computing respectively by the second coil LC2, resistance R22
Amplifier U4A reversed input pin；Reference voltage Vref B connects the same of the operational amplifier U4A respectively by resistance R24
One end of phase input pin and electric capacity C22, another termination power of the electric capacity C22；
The signal amplification circuit includes the first signal amplification circuit and secondary signal amplifying circuit, and first signal is put
The input of big circuit connects the second electrode of the four electrodes harmful gas sensor, first signal amplification circuit it is defeated
Go out end output SIG signals；The input of the secondary signal amplifying circuit connects the of the four electrodes harmful gas sensor
Four electrodes, the output end output ZERO signals of the secondary signal amplifying circuit；First signal amplification circuit and described
Binary signal amplifying circuit is two-way identical filtering and amplifying circuit, specifically, the filtering and amplifying circuit includes tertiary coil LC3
With operational amplifier U4B, the input of the filtering and amplifying circuit passes through described in the tertiary coil LC3 and resistance R25 connections
Operational amplifier U4B reversed input pin, the reference voltage Vref A connects the operation amplifier respectively by resistance R28
Device U4B homophase input pin and electric capacity C24 one end, another termination power of the electric capacity C24；The operational amplifier
U4B output pin is by resistance R27 and electric capacity C25 connection power supplys, the resistance R27 and the electric capacity C25 connection end
For the output end of first signal amplification circuit, the output end of the operational amplifier U4B also passes through electric capacity C23 and electricity respectively
Hinder R26 connections operational amplifier U4B reversed input pin；
The switch-off potential balancing circuitry includes FET Q3 and FET Q4, the FET Q3 and field-effect
Pipe Q4 is J177, and the pin 2 of the FET Q4 connects the 4th electrode of the four electrodes harmful gas sensor, described
FET Q4 pin 1 connects the pin 1 of the FET Q3 and the 3rd electricity of the four electrodes harmful gas sensor
Pole, the pin 2 of the FET Q3 connects the second electrode of the four electrodes harmful gas sensor, the FET Q3
Pin 3 and the FET Q4 pin 3 respectively with the supply voltage VCC connections.
Based on above-mentioned, it is i2401 cores that the digital signal processing circuit, which includes digit chip U1, the digit chip U1,
Piece, the pin 1 of the digit chip U1 connects the output signal SIG, the digit chip U1 of first signal amplification circuit
Pin 3 described in output signal ZERO, the digit chip U1 pin 2 and pin 4 of secondary signal amplifying circuit connect respectively
The reference voltage Vref A1 is met, with connecting power supply, the pin 9 of the digit chip U1 is defeated for the pin 6 of the digit chip U1
Enter the reference voltage Vref-A, the pin 11 of the digit chip U1 is by resistance R5 connection power supplys, the digit chip
U1 pin 13 connects the supply voltage VCC and electric capacity C3 one end, and the other end of the electric capacity C3 is with connecting power supply, described
Digit chip U1 pin 14 is by electric capacity C4 connection power supplys；
The pin 15 of the digit chip U1 is by electric capacity C5 connection power supplys, and the pin 15 of the digit chip U1 also leads to
Cross the resistance R6 connections supply voltage VCC；The pin 19 of the digit chip U1 is by resistance R4 on the external host
The analysis result is passed, the pin 20 of the digit chip U1 downloads control command, institute by resistance R3 from the external host
The pin 26 for stating digit chip U1 connects the level signal M-POW INFO.
Based on above-mentioned, the signal processing circuit also includes temperature-compensation circuit, and the temperature-compensation circuit includes temperature biography
Sensor U2, resistance R1, resistance R2, electric capacity C1 and electric capacity C2, the temperature sensor U2 are TC1047 temperature sensor chips, electricity
Source voltage VCC is by electric capacity C1 connection power supplys, and the supply voltage VCC is also connected with the pin 1 of the temperature sensor U2, institute
State pin 5 of the temperature sensor U2 pin 1 by the resistance R1 output temperature signals TEP to the digit chip U1, institute
The pin 1 for stating temperature sensor U2 also connects one end of the resistance R2 and one end of the electric capacity C2 respectively by resistance R1,
Another termination power of the resistance R2 and the electric capacity C2 the other end with connecing power supply respectively, the temperature sensor U2's
Pin 3 is with connecing power supply.
The utility model compared with the prior art have substantive distinguishing features and progress, specifically, the process circuit use compared with
Few appliance component, realizes the modularized design to four electrode harmful gas sensor signals, effectively reduces harmful gas
The construction cycle of body product and development cost, are easy to marketing to utilize.
Brief description of the drawings
Fig. 1 is theory diagram of the present utility model.
Fig. 2 is the circuit diagram of level sensitive circuit described in the utility model.
Fig. 3 is the circuit diagram of power supply circuit described in the utility model.
Fig. 4 is the circuit diagram of the reference voltage generating circuit of the present utility model.
Fig. 5 is sensor signal processing circuit of the present utility model.
Fig. 6 is temperature-compensation circuit figure of the present utility model.
Fig. 7 is digital signal processing circuit of the present utility model.
Embodiment
Below by embodiment, the technical solution of the utility model is described in further detail.
As shown in figure 1, a kind of signal processing circuit of harmful gas sensor, including sensor signal amplifying circuit, number
Word signal processing circuit, reference voltage generating circuit and electric power management circuit；
The reference voltage generating circuit is used for the reference voltage for generating the sensor signal amplifying circuit, the sensing
Device signal amplification circuit is received and amplifies the electric signal of four electrode harmful gas sensors output, and the electric signal after amplification is sent out
Deliver to the digital signal processing circuit；
The digital signal processing circuit converts electrical signals to data signal, and is parsed and work as according to the data signal
The concentration value of preceding pernicious gas, then analysis result is sent to external host；
The electric power management circuit is used to control the working condition of the digital signal processing circuit and to the sensing
Device signal amplification circuit, the digital signal processing circuit and the reference voltage generating circuit provide supply voltage.
Specifically, the electric power management circuit is divided into level sensitive circuit and power supply circuit, as shown in Fig. 2 the level
Detect that circuit includes triode Q1, it is preferred that the triode is 9013 triodes；The base stage of the triode Q1 passes through resistance
R10 connection 5V positive voltages, the base stage of the triode Q1 is described also by resistance R11 connections triode Q1 emitter stage
With connecing power supply, the colelctor electrode of the triode Q1 passes through pull-up resistor R8 connection supply voltage VCC, institute to triode Q1 emitter stage
State triode Q1 colelctor electrode also outputs level signals M-POW INFO.
When being powered by outside+5V power supplys, the output level M-Pow_Info of the triode Q1 is low level, the number
When word chip U1 detects the low level, you can judge to be currently external power source power supply state, the digit chip enters work
Operation mode；When external power source disconnects, the output level M-Pow_Info of the triode Q1 is high level, the digit chip
When U1 detects the high level, just can determine whether out to be currently battery-powered state, hence into low-power consumption standby pattern.
The power supply circuit is used for the sensor signal amplifying circuit, the digital signal processing circuit and the ginseng
Examine voltage generation circuit and supply voltage is provided.As shown in figure 3, the power supply circuit includes voltage-stablizer U3, it is preferred that the voltage stabilizing
Device U3 is the serial voltage-stablizers of REF333X；By electric capacity C6 with connecing power supply, positive 5V power supplys are also connected with the voltage-stablizer U3 to positive 5V power supplys
Input pin 1, the output pin 2 of the voltage-stablizer U3 connects battery BT1 positive pole and diode D1 anode respectively, described
Battery BT1 negative pole connection power supply, the negative electrode output supply voltage VCC of the diode D1, the negative electrode of the diode D1
By resistance R7 output reference voltages Vref-A, the negative electrode of the diode D1 also connects resistance R9 respectively by the resistance R7
With electric capacity C8, the resistance R9 and the electric capacity C8 connections power supply, the negative electrode of the diode D1 passes through electric capacity C7 connections electricity
Source.
Wherein, the purpose of the diode D1 is to prevent the appearance of reverse current, so as to avoid when battery is powered, electric current
Reversely pour into the power source reference chip U3, increase power consumption.
Specifically, as shown in figure 4, the reference voltage generating circuit includes multiple high-precision divider resistances, eliminating makes
The trouble of reference power source is provided for circuit with power source special chip, while also reducing the cost of circuit.The supply voltage VCC
After combination different between resistance R31, resistance R32, resistance R33, resistance R34, resistance R35 and resistance R36, generation is with reference to electricity
Press VrefA and reference voltage Vref B；The reference voltage Vref A passes through the operational amplifier U4C amplifiers and resistance simultaneously
After the drive circuit of R39 compositions, reference voltage Vref-A is also generated, for being provided to the digital signal processing circuit with reference to electricity
Pressure.
Specifically, as shown in figure 5, the sensor signal amplifying circuit includes four electrode harmful gas sensors, sensing
Device output stabilizing circuit, signal amplification circuit and switch-off potential balancing circuitry；Wherein, in the sensor signal amplifying circuit
The operational amplifier U4 is LT3012, and the FET Q3 and FET Q4 are J177, and four electrode is harmful to gas
Body sensor is B4 series sensors；Pernicious gas is converted into the faint electric signal of two-way by the B4 series sensors, then
Exported respectively via the second electrode and the 4th electrode of the B4 series sensors to operational amplifier U4B and operational amplifier
The reversed input pin of U4D amplifiers, in the reference voltage Vref A and the operational amplifier U4B and the operational amplifier
In the presence of U4C, this two-way ultra-weak electronic signal output two paths of signals " SIG " and " ZERO ".
First electrode, second electrode, the reference voltage Vref B and the operational amplifier of the B4 series sensors
U4 U4A is collectively forming sensor output stabilizing circuit.The FET Q3 and FET Q4 constitutes switch-off potential
Balancing circuitry, for providing potential balance bar in the case of B4 series sensors power-off for the B4 series sensors
Part.
Specifically, as shown in fig. 6, the temperature-compensation circuit is made up of temperature sensor chip U2 plus peripheral circuit,
The temperature sensor U2 be TC1047 temperature sensor chips, the TC1047 TEMPs chip in real time output with environment into
The temperature simulation amount signal of linear relationship, the partial pressure that the temperature simulation amount signal is constituted via resistance R1, resistance R2, electric capacity C2
And after filter circuit processing, the temperature signal value in environment is provided to the digital processing circuit.
Specifically, as shown in fig. 7, the digital processing circuit mainly be made up of intelligent chip U1, the intelligent chip
U1 is i2401 chips；" SIG, ZERO " signal are the sensor signal amplifications to the analog quantity sampling end of the digit chip U1
Two groups of concentration of analog amount signals of circuit output, " TEP " signal of the intelligent chip U1 is temperature sensor output
Temperature simulation amount signal.
Concentration of analog amount signal and temperature simulation amount signal are converted into data signal by the digital signal processing circuit, and
The concentration value of present harmful gas is parsed by the analyzing and processing to the data signal and temperature-compensating is carried out, most obtained at last
The concentration signal taken is communicated with host computer.
Finally it should be noted that:Above example is only to illustrate the technical solution of the utility model rather than it is limited
System；Although the utility model is described in detail with reference to preferred embodiment, those of ordinary skill in the art should
Understand：Still embodiment of the present utility model can be modified or some technical characteristics are equally replaced
Change；Without departing from the spirit of technical solutions of the utility model, it all should cover in the claimed technical scheme of the utility model
Among scope.
Claims (6)
1. a kind of signal processing circuit of harmful gas sensor, it is characterised in that：Including sensor signal amplifying circuit, numeral
Signal processing circuit, reference voltage generating circuit and electric power management circuit；
The reference voltage generating circuit is used for the reference voltage for generating the sensor signal amplifying circuit, the sensor letter
Number amplifying circuit receives and amplifies the electric signal of four electrode harmful gas sensors output, and by the electric signal after amplification send to
The digital signal processing circuit；
The digital signal processing circuit converts electrical signals to data signal, and is parsed and currently have according to the data signal
The concentration value of evil gas, then analysis result is sent to external host；
The electric power management circuit is used for the working condition for controlling the digital signal processing circuit and believed to the sensor
Number amplifying circuit, the digital signal processing circuit and the reference voltage generating circuit provide supply voltage.
2. the signal processing circuit of harmful gas sensor according to claim 1, it is characterised in that：The power management
Circuit is divided into level sensitive circuit and power supply circuit,
It is 9013 that the level sensitive circuit, which includes triode Q1, the triode Q1, and the base stage of the triode Q1 passes through electricity
R10 connection 5V positive voltages are hindered, the base stage of the triode Q1 also passes through resistance R11 connections triode Q1 emitter stage, institute
State triode Q1 emitter stage with connecing power supply, the colelctor electrode of the triode Q1 by pull-up resistor R8 connection supply voltage VCC,
The colelctor electrode of the triode Q1 also outputs level signals M-POW INFO；
It is the serial voltage-stablizers of REF333X that the power supply circuit, which includes voltage-stablizer U3, the voltage-stablizer U3, and positive 5V power supplys pass through electric capacity
With connecing power supply, positive 5V power supplys are also connected with the input pin 1 of the voltage-stablizer U3 to C6, and the output pin 2 of the voltage-stablizer U3 is distinguished
Connection battery BT1 positive pole and diode D1 anode, the negative pole connection power supply of the battery BT1, the diode D1's
Negative electrode output supply voltage VCC, the diode D1 negative electrode pass through resistance R7 output reference voltages Vref-A, the diode
D1 negative electrode also connects resistance R9 one end and electric capacity C8 one end, the other end of the resistance R9 respectively by the resistance R7
With the other end of the electric capacity C8 with connecting power supply, the negative electrode of the diode D1 is by electric capacity C7 connection power supplys, the electricity
Connect publicly to source.
3. the signal processing circuit of harmful gas sensor according to claim 2, it is characterised in that：The reference voltage
Generative circuit includes operational amplifier U4C, resistance R31, resistance R35, resistance R33, resistance R36 and electric capacity C27, the power supply electricity
Press VCC by the electric capacity C27 connections power supply, the supply voltage VCC passes through the resistance R31 and resistance R35 companies
With connecing power supply, the resistance R31 and resistance R35 connection end output reference voltage VrefA, the supply voltage VCC is also
By the resistance R33 and the resistance R36 connections power supply, the resistance R33 and the resistance R36 connection end output ginseng
The connection end for examining voltage VrefB, the resistance R33 and the resistance R36 is also respectively connected with one end and the resistance R32 of resistance R34
One end, the other end of the resistance R34 connects the connection end of the resistance R31 and resistance R35, the resistance R32's
Other end connection power supply；
The reference voltage Vref A also passes through resistance R39 connections operational amplifier U4C homophase input pin, the fortune
The output pin for calculating amplifier U4 connects the reversed input pin of the operational amplifier U4, the output of the operational amplifier U4
Pin also output reference voltage VrefA1.
4. the signal processing circuit of harmful gas sensor according to claim 3, it is characterised in that：The sensor letter
Number amplifying circuit includes four electrode harmful gas sensors, sensor output stabilizing circuit, signal amplification circuit and switch-off potential
Balancing circuitry,
The sensor output stabilizing circuit includes first coil LC1, the second coil LC2 and operational amplifier U4A, the computing
Amplifier U4 is LT3012, and the first electrode of the four electrodes harmful gas sensor passes through the first coil LC1, resistance
R21 connects electric capacity C21 one end and the output end of the operational amplifier U4A, the four electrodes harmful gas sensor respectively
The 3rd electrode the other end of the electric capacity C21 is connected by the second coil LC2, resistance R22 respectively and the computing is put
Big device U4A reversed input pin；Reference voltage Vref B connects the same phase of the operational amplifier U4A by resistance R24 respectively
One end of input pin and electric capacity C22, another termination power of the electric capacity C22；
The signal amplification circuit includes the first signal amplification circuit and secondary signal amplifying circuit, the first signal amplification electricity
The input on road connects the second electrode of the four electrodes harmful gas sensor, the output end of first signal amplification circuit
Export SIG signals；The input of the secondary signal amplifying circuit connects the 4th electricity of the four electrodes harmful gas sensor
Pole, the output end output ZERO signals of the secondary signal amplifying circuit；First signal amplification circuit and second letter
Number amplifying circuit is two-way identical filtering and amplifying circuit, specifically, the filtering and amplifying circuit includes tertiary coil LC3 and fortune
Amplifier U4B is calculated, the input of the filtering and amplifying circuit passes through the tertiary coil LC3 and the resistance R25 connections computing
Amplifier U4B reversed input pin, the reference voltage Vref A connects the operational amplifier U4B respectively by resistance R28
Homophase input pin and electric capacity C24 one end, another termination power of the electric capacity C24；The operational amplifier U4B's
Output pin is by resistance R27 and electric capacity C25 connection power supplys, and the resistance R27 and the electric capacity C25 connection end are described
The output end of first signal amplification circuit, the output end of the operational amplifier U4B also passes through electric capacity C23 and resistance R26 respectively
Connect the reversed input pin of the operational amplifier U4B；
The switch-off potential balancing circuitry includes FET Q3 and FET Q4, the FET Q3 and FET Q4
It is J177, the pin 2 of the FET Q4 connects the 4th electrode of the four electrodes harmful gas sensor, the field effect
Should pipe Q4 pin 1 connect the pin 1 of the FET Q3 and the 3rd electrode of the four electrodes harmful gas sensor, institute
The pin 2 for stating FET Q3 connects the second electrode of the four electrodes harmful gas sensor, and the FET Q3's draws
Pin 3 and the FET Q4 pin 3 respectively with the supply voltage VCC connections.
5. the signal processing circuit of harmful gas sensor according to claim 4, it is characterised in that：The data signal
It is i2401 chips that process circuit, which includes digit chip U1, the digit chip U1,
The pin 1 of the digit chip U1 connects the output signal SIG, the digit chip U1 of first signal amplification circuit
Pin 3 described in output signal ZERO, the digit chip U1 pin 2 and pin 4 of secondary signal amplifying circuit connect respectively
The reference voltage Vref A1 is met, with connecting power supply, the pin 9 of the digit chip U1 is defeated for the pin 6 of the digit chip U1
Enter the reference voltage Vref-A, the pin 11 of the digit chip U1 is by resistance R5 connection power supplys, the digit chip
U1 pin 13 connects the supply voltage VCC and electric capacity C3 one end, and the other end of the electric capacity C3 is with connecting power supply, described
Digit chip U1 pin 14 is by electric capacity C4 connection power supplys；
The pin 15 of the digit chip U1 is by electric capacity C5 connection power supplys, and the pin 15 of the digit chip U1 also passes through electricity
Hinder the R6 connections supply voltage VCC；The pin 19 of the digit chip U1 uploads institute by resistance R4 to the external host
Analysis result is stated, the pin 20 of the digit chip U1 downloads control command, the number by resistance R3 from the external host
Word chip U1 pin 26 connects the level signal M-POW INFO.
6. the signal processing circuit of harmful gas sensor according to claim 5, it is characterised in that：Signal transacting electricity
Road also include temperature-compensation circuit, the temperature-compensation circuit include temperature sensor U2, resistance R1, resistance R2, electric capacity C1 and
Electric capacity C2, the temperature sensor U2 are TC1047 temperature sensor chips, and supply voltage VCC passes through electric capacity C1 connection power supplys
Ground, the supply voltage VCC is also connected with the pin 1 of the temperature sensor U2, and the pin 1 of the temperature sensor U2 passes through institute
The pin 1 for stating resistance R1 output temperature signals TEP, the temperature sensor U2 also connects the resistance R2 respectively by resistance R1
One end and the electric capacity C2 one end, another termination power of the resistance R2 and the other end of the electric capacity C2 connect respectively
Power supply, the pin 3 of the temperature sensor U2 is with connecing power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620968759.3U CN206431078U (en) | 2016-08-30 | 2016-08-30 | The signal processing circuit of harmful gas sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620968759.3U CN206431078U (en) | 2016-08-30 | 2016-08-30 | The signal processing circuit of harmful gas sensor |
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| CN206431078U true CN206431078U (en) | 2017-08-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112365911A (en) * | 2020-11-09 | 2021-02-12 | 无锡拍字节科技有限公司 | Memory and reference signal generating circuit thereof |
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- 2016-08-30 CN CN201620968759.3U patent/CN206431078U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112365911A (en) * | 2020-11-09 | 2021-02-12 | 无锡拍字节科技有限公司 | Memory and reference signal generating circuit thereof |
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