CN207751970U - A kind of miniature air mass sensor support circuit - Google Patents
A kind of miniature air mass sensor support circuit Download PDFInfo
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- CN207751970U CN207751970U CN201820148533.8U CN201820148533U CN207751970U CN 207751970 U CN207751970 U CN 207751970U CN 201820148533 U CN201820148533 U CN 201820148533U CN 207751970 U CN207751970 U CN 207751970U
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Abstract
The utility model discloses a kind of miniature air mass sensor support circuits, including sensor amplifier circuit, sensor low power consumpting controling circuit, power supply and signal interface circuit, and master chip, sensor amplifier circuit input terminal are connect with sensor output, sensor amplifier circuit output end is connect with master chip, sensor low power consumpting controling circuit output end is connect with master chip, and master chip is connected by powering with signal interface circuit with smart machine；Sensor amplifier circuit includes：The output end of single order low pass amplifying circuit and biasing circuit, sensor is connect with single order low pass amplifying circuit, and the cathode output end of sensor is connect with biasing circuit.The utility model is amplified small-signal into row index by the way that single order low pass amplifying circuit is arranged, improve measuring accuracy, biasing circuit, which is arranged, prevents sensor signal to be backwards to the measurement range judged less than master chip, and setting sensor low power consumpting controling circuit reduces the power consumption of sensor, simple in structure.
Description
Technical field
The utility model is related to circuit field more particularly to a kind of miniature air mass sensor support circuits.
Background technology
In recent years, with the rapid development of intellectual product, intelligence dresses class product and has also developed to unprecedented scale, intelligence
Mobile phone, Intelligent bracelet and smartwatch have spread all over city as representative the most outstanding in intelligence wearing, Related product
Streets and lanes.It may be said that such product has had reached a ripe stage.
During entire development, such intellectual product, such as Intelligent bracelet, occur two and obviously applies
Direction, first direction are exactly application of such product in terms of health care, and second direction is exactly that such product is moving
The application of healthy aspect.In terms of health care, main function be for measuring heart rate, blood oxygen, blood pressure and body temperature etc., although
Its numerical value can be measured, but the accuracy of medical grade equipment is also not achieved, is used with reference to amount so can only be used as；And it is moving
Healthy aspect, main function are for recording movement step number, caloric burn and can also carry out sitting prompting, sleep inspection
Survey etc..Its application in this regard is more more prominent compared in terms of health care.
Regardless of being smart mobile phone, Intelligent bracelet or smartwatch, it is directed to component, the component of addition, all must
Can must meet small, low in energy consumption and cost moderate, is welcomed by the general public the problem of being ready to be added with producer.These conditions
All kinds of classical and practical sensor is all limited to be embedded into inside intelligence wearing product.
In the prior art, the support circuit design of most of air quality sensors is complicated, and processing of circuit efficiency is low, power consumption
Higher with cost, operational precision is relatively low, can not successfully manage increasingly severe environmental problem.The circuit of the utility model is Shen
It asks someone the support circuit of miniature air mass sensor separately applied.
Therefore, the prior art is defective, needs to improve.
Utility model content
Technical problem to be solved in the utility model is：It is simple to provide a kind of circuit structure, measuring accuracy is high, power consumption
It is small, lower-cost miniature air mass sensor support circuit.
The technical solution of the utility model is as follows：A kind of miniature air mass sensor support circuit, for connecting sensing
Device and smart machine, including sensor amplifier circuit, sensor low power consumpting controling circuit, power supply and signal interface circuit, and
Master chip, the sensor amplifier circuit input terminal are connect with sensor output, the sensor amplifier circuit output end with
Master chip connects, and the sensor low power consumpting controling circuit output end is connect with master chip, and the master chip and smart machine are logical
Power supply is crossed to connect with signal interface circuit；Wherein, the sensor amplifier circuit includes：For the weak signal of sensor to be carried out
The single order low pass amplifying circuit of index amplification, and the measurement model that judges less than master chip for preventing sensor signal to be backwards to
The output end of the biasing circuit enclosed, the sensor is connect with single order low pass amplifying circuit, the cathode output end of the sensor
It is connect with biasing circuit.
Using above-mentioned technical proposal, in the miniature air mass sensor support circuit, the single order low pass amplification
Circuit includes：First resistor, second resistance, the first capacitance and operational amplifier, the cathode of the sensor pass through first
The inverting input of resistance and operational amplifier connects, the in-phase output end phase of the anode and operational amplifier of the sensor
Even, second resistance, the second resistance and the first electricity are connected between the inverting input and output end of the operational amplifier
Hold parallel connection, the output end of the operational amplifier is connect with master chip.
Using above-mentioned each technical solution, in the miniature air mass sensor support circuit, the biasing circuit
Including 3rd resistor and the 4th resistance, the first end of the 3rd resistor is electrically connected with the anode of sensor, the 3rd resistor
Second end be electrically connected with VCC, the first end of the 4th resistance is electrically connected with the first end of 3rd resistor, the 4th resistance
Second end ground connection.
Using above-mentioned each technical solution, in the miniature air mass sensor support circuit, the sensor is low
Power control circuit includes the 5th resistance, the 6th resistance, the 7th resistance, triode, field-effect tube and the second capacitance, described
The poles S of field-effect tube are electrically connected VCC, and by the second capacity earth, the G of the field-effect tube is extremely logical for the poles D of the field-effect tube
It crosses the 5th resistance to be electrically connected with VCC, the poles G of the field-effect tube are electrically connected with the collector of triode, the hair of the triode
The base stage of emitter grounding, the triode is electrically connected by the 6th resistance with master chip, the base stage and emitter of the triode
Between be also associated with the 7th resistance.
Using above-mentioned each technical solution, in the miniature air mass sensor support circuit, the power supply and letter
Number interface circuit is a 6 line golden finger interfaces, and the 6 line golden finger interface first end is connect with master chip, second end and
Smart machine is electrically connected.
Using above-mentioned each technical solution, the utility model is by being arranged single order low pass amplifying circuit by the faint of sensor
Signal amplifies into row index, improves the measuring accuracy of sensor, and setting biasing circuit prevents sensor signal to be backwards to less than master
The measurement range that chip judges, setting sensor low power consumpting controling circuit control the power consumption for reducing sensor, simple in structure, cost
It is relatively low.
Description of the drawings
Fig. 1 is the electrical block diagram of the utility model.
Specific implementation mode
Below in conjunction with the drawings and specific embodiments, the utility model is described in detail.
A kind of miniature air mass sensor support circuit is present embodiments provided, is set for connecting sensor and intelligence
It is standby, including sensor amplifier circuit 102, sensor low power consumpting controling circuit 101, power supply and signal interface circuit 103, Yi Jizhu
Chip, 102 input terminal of the sensor amplifier circuit are connect with sensor output, and the sensor amplifier circuit 102 exports
End is connect with master chip IC1, and 101 output end of sensor low power consumpting controling circuit is connect with master chip IC1, the master chip
IC1 and smart machine are connected by power supply and signal interface circuit 103；Wherein, the sensor amplifier circuit 102 includes：With
In the single order low pass amplifying circuit for amplifying the weak signal of sensor into row index, and for preventing sensor signal to be backwards to
Less than the biasing circuit of the master chip IC1 measurement ranges judged, output end and the single order low pass amplifying circuit of the sensor connect
It connects, the cathode output end of the sensor is connect with biasing circuit.
Such as Fig. 1, the circuit and miniature air mass sensor of the present embodiment are mating, are set for connecting sensor and intelligence
It is standby.Include mainly：Sensor amplifier circuit 102, the small-signal for acquiring sensor is amplified, more accurately to be counted
According to；Sensor low power consumpting controling circuit 101, the power consumption for controlling sensor make entire sensor processing and telecommunication circuit
Average operating current be reduced to 1uA, extend the working time of whole system；Power supply and signal interface circuit 103 and main core
Piece IC1, wherein power supply and signal interface circuit 103 are for connecting master chip IC1 and smart machine.It will be empty by master chip IC1
Gas mass parameter is stored and is shown on intelligent devices.Sensor amplifier circuit 102 includes single order low pass amplifying circuit again,
And biasing circuit.Wherein, the small-signal that sensor acquires is carried out exponential put by single order low pass amplifying circuit for being responsible for
Greatly, and by the signal of amplification it is transmitted to master chip IC1, to improve the precision of sensor.And biasing circuit is then used to prevent from sensing
Device sense ensures that master chip IC1 can be received under any circumstance to the measurement range judged less than master chip IC1
The detection signal of sensor.Meanwhile the range and precision of sensor can be by adjusting operational amplifiers and its feedback resistance
Resistance value, and the corresponding algorithm data table of the different accuracy is set in algorithmic code, you can realize same sensor test not
Same range and precision.Measuring accuracy can select three gears, such as 0-100PPM grades, 0-10PPM grades and 3 kinds of 0-100PPB shelves
Different gears.
Further, the single order low pass amplifying circuit includes：First resistor Rop_1, second resistance Rop_2, first
Capacitance Cop-106 and operational amplifier IC_op_2, the cathode of the sensor pass through first resistor Rop_1 and operation amplifier
The inverting input of device IC_op_2 connects, the in-phase output end phase of the anode and operational amplifier IC_op_2 of the sensor
Even, it is connected with second resistance Rop_2 between the inverting input and output end of the operational amplifier IC_op_2, described second
Resistance Rop_2 is in parallel with the first capacitance Cop-106, and the output end of the operational amplifier IC_op_2 is connect with master chip IC1.
Further, the biasing circuit includes 3rd resistor Rop_3 and the 4th resistance Rop_4, the 3rd resistor
The anode of the first end of Rop_3 and sensor is electrically connected, and the second end of the 3rd resistor Rop_3 is electrically connected with VCC, and described the
The first end of four resistance Rop_4 is electrically connected with the first end of 3rd resistor Rop_3, the second termination of the 4th resistance Rop_4
Ground.
Further, the sensor low power consumpting controling circuit 101 includes the 5th resistance Rb1, the 6th resistance Rb2, the
The poles S of seven resistance Rb3, triode T1, field-effect tube M1 and the second capacitance Crst, the field-effect tube M1 are electrically connected VCC,
The poles D of the field-effect tube M1 by the second capacitance Crst ground connection, the poles G of the field-effect tube M1 by the 5th resistance Rb1 with
VCC is electrically connected, and the poles G of the field-effect tube M1 are electrically connected with the collector of triode T1, and the emitter of the triode T1 connects
The base stage on ground, the triode T1 is electrically connected by the 6th resistance Rb2 with master chip IC1, the base stage and hair of the triode T1
The 7th resistance Rb3 is also associated between emitter-base bandgap grading.
Further, the power supply and signal interface circuit 103 are a 6 line golden finger interface JSOU, the 6 line gold
Finger interface JSOU first ends are connect with master chip IC1, and second end is electrically connected with smart machine.
Using above-mentioned each technical solution, the utility model is by being arranged single order low pass amplifying circuit by the faint of sensor
Signal amplifies into row index, improves the measuring accuracy of sensor, and setting biasing circuit prevents sensor signal to be backwards to less than master
The measurement range that chip judges, setting sensor low power consumpting controling circuit control the power consumption for reducing sensor, simple in structure, cost
It is relatively low.
The above is only the preferred embodiments of the present utility model only, is not intended to limit the utility model, all in this practicality
All any modification, equivalent and improvement etc., should be included in the guarantor of the utility model made by within novel spirit and principle
Within the scope of shield.
Claims (5)
1. a kind of miniature air mass sensor support circuit, for connecting sensor and smart machine, it is characterised in that：Including
Sensor amplifier circuit, sensor low power consumpting controling circuit, power supply and signal interface circuit and master chip, the sensor
Input amplifier is connect with sensor output, and the sensor amplifier circuit output end is connect with master chip, the biography
Sensor low power consumpting controling circuit output end is connect with master chip, and the master chip and smart machine pass through power supply and signaling interface electricity
Road connects；Wherein, the sensor amplifier circuit includes：Single order low pass for amplifying the weak signal of sensor into row index
Amplifying circuit, and the biasing circuit of measurement range that judges less than master chip for preventing sensor signal to be backwards to, it is described
The output end of sensor is connect with single order low pass amplifying circuit, and the cathode output end of the sensor is connect with biasing circuit.
2. miniature air mass sensor support circuit according to claim 1, it is characterised in that：The single order low pass is put
Big circuit includes：The cathode of first resistor, second resistance, the first capacitance and operational amplifier, the sensor passes through
The inverting input of one resistance and operational amplifier connects, the in-phase output end phase of the anode and operational amplifier of the sensor
Even, second resistance, the second resistance and the first electricity are connected between the inverting input and output end of the operational amplifier
Hold parallel connection, the output end of the operational amplifier is connect with master chip.
3. miniature air mass sensor support circuit according to claim 1, it is characterised in that：The biasing circuit packet
3rd resistor and the 4th resistance are included, the first end of the 3rd resistor is electrically connected with the anode of sensor, the 3rd resistor
Second end is electrically connected with VCC, and the first end of the 4th resistance is electrically connected with the first end of 3rd resistor, the 4th resistance
Second end is grounded.
4. miniature air mass sensor support circuit according to claim 1, it is characterised in that：The low work(of the sensor
It includes the 5th resistance, the 6th resistance, the 7th resistance, triode, field-effect tube and the second capacitance, the field to consume control circuit
The poles S of effect pipe are electrically connected VCC, and by the second capacity earth, the poles G of the field-effect tube pass through for the poles D of the field-effect tube
5th resistance is electrically connected with VCC, and the poles G of the field-effect tube are electrically connected with the collector of triode, the transmitting of the triode
Pole is grounded, and the base stage of the triode is electrically connected by the 6th resistance with master chip, the base stage and emitter of the triode it
Between be also associated with the 7th resistance.
5. miniature air mass sensor support circuit according to claim 1, it is characterised in that：The power supply and signal
Interface circuit is a 6 line golden finger interfaces, and the 6 line golden finger interface first end is connect with master chip, second end and intelligence
It can equipment electrical connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820148533.8U CN207751970U (en) | 2018-01-29 | 2018-01-29 | A kind of miniature air mass sensor support circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820148533.8U CN207751970U (en) | 2018-01-29 | 2018-01-29 | A kind of miniature air mass sensor support circuit |
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| Publication Number | Publication Date |
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| CN207751970U true CN207751970U (en) | 2018-08-21 |
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| CN201820148533.8U Active CN207751970U (en) | 2018-01-29 | 2018-01-29 | A kind of miniature air mass sensor support circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113551589A (en) * | 2021-01-06 | 2021-10-26 | 南京能晶电子科技有限公司 | Angle sensor chip based on Hall device and use method thereof |
-
2018
- 2018-01-29 CN CN201820148533.8U patent/CN207751970U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113551589A (en) * | 2021-01-06 | 2021-10-26 | 南京能晶电子科技有限公司 | Angle sensor chip based on Hall device and use method thereof |
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