CN106353600A - Resistance detection circuit of potentiometer for anesthesia apparatus motor valve positioning - Google Patents
Resistance detection circuit of potentiometer for anesthesia apparatus motor valve positioning Download PDFInfo
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- CN106353600A CN106353600A CN201510409150.2A CN201510409150A CN106353600A CN 106353600 A CN106353600 A CN 106353600A CN 201510409150 A CN201510409150 A CN 201510409150A CN 106353600 A CN106353600 A CN 106353600A
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- potentiometer
- signal
- electric current
- circuit
- current loop
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Abstract
The invention provides a resistance detection circuit of a potentiometer for anesthesia apparatus motor valve positioning. The resistance detection circuit comprises an amplified-signal conditioning circuit and a circuit loop drive; the amplified-signal conditioning circuit is used for converting high-impedance voltage signals corresponding to a center tap of the potentiometer into low-impedance voltage signals prior to outputting the low-impedance voltage signals into the circuit loop drive; the circuit loop drive provides reference voltage to the potentiometer via an external power source, converting received voltage signals into current signals, taking the current signals as transmission signals subjected to resistance detection of the potentiometer, and outputting the current signals. The voltage signals output by the potentiometer through the electric loop drive of the circuit are converted into the current signals which are transmitted as the transmission signals subjected to resistance detection of the potentiometer, the problem that the voltage signals of the potentiometer, directly transmitted are prone to interference can be solved, and heating of the potentiometer powered by directly adopting the constant flow source can be avoided.
Description
Technical field
The present invention relates to Anesthesia machine motor valve field of locating technology is and in particular to a kind of position for Anesthesia machine motor valve
Potentiometer resistance testing circuit.
Background technology
In the Anesthesia machine that step motor valve controls, the aperture of step motor control needle-valve, thus realize the control of tidal volume
System.Need to know the position of stepper motor in this control process, and then obtain the aperture of needle-valve, in order to avoid causing pin
Valve is stuck.Position instruction usually uses potentiometer, and stepper motor, needle-valve, potentiometer are coaxial, and stepper motor rotates
When, drive needle-valve and potentiometer, now stepper motor turns an angle, and potentiometer resistance also occurs to change accordingly,
So the angle that stepper motor rotates just be can indicate that by the change in resistance of potentiometer, be also known that opening of needle-valve
Degree.The change in resistance of general detection potentiometer is to connect a reference voltage source at the two ends of potentiometer, by detection
Between voltage change corresponding to tap it is possible to know the change in resistance of potentiometer.But, potentiometer centre tap institute
The change voltage signal producing is the signal of a high impedance, and antijamming capability is very poor, and particularly stepper motor is rotating
When, the pulse signal of Driving Stepping Motor can produce very strong interference to surrounding environment, so using reference voltage
Source detects that the method ratio of precision of potentiometer voltage change is relatively low.If driving potentiometer using reference current source, need to select
The less potentiometer of resistance, the electric current that such potentiometer passes through can ratio larger, current signal has stronger anti-interference energy
Power, but it has a lot of requirements to the performance of potentiometer, and the resistance of potentiometer can not be too big, and no person's heating can be compared
More serious, if drive the effect not having constant-current source using low-current source again.
Content of the invention
It is an object of the invention to, for solving to position Anesthesia machine by detecting the change of potentiometer resistance in prior art
During motor valve, the detection signal antijamming capability of generation is very poor, or the circumscribed technology of presence that potentiometer is used
Problem, the present invention provides a kind of resistance testing circuit of the potentiometer for Anesthesia machine motor valve positioning, using this resistance
The detection signal of value testing circuit output can either solve directly to transmit that potentiometer voltage signal is subject to disturb asks
Topic, be can solve the problem that the problem directly being made potentiometer heating using constant current source power supply again, improves Anesthesia machine motor valve
The accuracy of positioning.
For achieving the above object, the resistance inspection of a kind of potentiometer for Anesthesia machine motor valve positioning that the present invention provides
Slowdown monitoring circuit, including amplification signal conditioning circuit and electric current loop driver；Described amplification signal conditioning circuit is used for will
After high impedance voltage signal corresponding to the centre tap of potentiometer is converted to voltage signal in low impedance, input to electric current
Ring driver；Described electric current loop driver passes through external power supply provides reference voltage for potentiometer, and will receive
Voltage signal be converted to current signal after, this current signal is carried out as the transmission signal that potentiometer resistance detects
Output.
As the improvement further of technique scheme, it is to put that described electric current loop driver passes through built-in voltage-stablizer
Big signal conditioning circuit is powered.
As the improvement further of technique scheme, described electric current loop driver adopts xtr116 electric current loop chip
Or the voltage signal receiving is converted to the current signal of 4ma～20ma by xtr115 electric current loop chip.
As the improvement further of technique scheme, described amplification signal conditioning circuit adopts difference amplifier or instrument
High impedance voltage signal corresponding to the centre tap of potentiometer is converted to voltage signal in low impedance by table amplifier.
A kind of resistance detection means advantage of potentiometer for Anesthesia machine motor valve positioning of the present invention is:
It is that potentiometer provides reference voltage that the resistance testing circuit of the present invention passes through using electric current loop driver, and utilization should
The voltage signal that potentiometer is exported by electric current loop driver is changed into the transmission that current signal detects as potentiometer resistance
Signal is transmitted, and so can either solve the problems, such as that the voltage signal directly transmitting potentiometer is subject to disturb,
If again it can be avoided that directly cause the problem of its heating to potentiometer using constant current source power supply.
Brief description
Fig. 1 is the resistance detection means of the potentiometer that one of embodiment of the present invention is used for Anesthesia machine motor valve positioning
Circuit diagram.
Specific embodiment
With reference to the accompanying drawings and examples to a kind of potentiometer for Anesthesia machine motor valve positioning of the present invention
Resistance testing circuit is described in detail.
The resistance testing circuit of the potentiometer for Anesthesia machine motor valve positioning of the present invention includes: amplifies signal condition
Circuit and electric current loop driver；The described signal conditioning circuit that amplifies is used for corresponding to the centre tap of potentiometer
After high impedance voltage signal is converted to low-impedance voltage signal, input to electric current loop driver；Described electric current loop
Driver passes through external power supply provides reference voltage for potentiometer, and the voltage signal receiving is converted to electric current letter
After number, the transmission signal that this current signal is detected as potentiometer resistance is exported.The centre of described potentiometer
Tap refers to the increased resistance value of potentiometer, potentiometer i.e. slide rheostat, and that is, described centre tap is exactly
The resistance value that changes when potentiometer slides, after connecting with the mains (a reference source), corresponding be exactly voltage signal change.
Based on the resistance testing circuit of said structure, as shown in figure 1, resistance testing circuit bag in the present embodiment
Include amplification signal conditioning circuit and electric current loop driver, wherein electric current loop driver employs electric current loop chip xtr116
Or the potentiometer receiving signal is converted to the current signal of 4ma～20ma by electric current loop chip xtr115, described
Electric current loop chip xtr116/xtr115 need to be driven by the supply voltage of an external power supply, its driving
Voltage should be greater than 7.5v, and this electric current loop chip xtr116/xtr115 also needs to a built-in return wire simultaneously, at this
To produce the current signal of 4ma～20ma on return wire.Described potentiometer can be produced by electric current loop chip xtr116
The 2.5v a reference source of raw 4.096v a reference source or electric current loop chip xtr115 generation is powered；Meanwhile, electric current loop
Driver can produce the voltage of a vcc signal 5v by built-in voltage-stablizer, for amplification signal conditioning circuit
Power supply.Directly to potentiometer and amplify signal condition because xtr116/xtr115 chip is integrated with each voltage in itself
Circuit is powered, and voltage signal is ultimately converted to what 4ma～20ma current signal detected as potentiometer resistance
Transmission signal is exported, so there is not any interference problem.
Described amplification signal conditioning circuit is exactly voltage follower circuit in fact, and it is used for changing the impedance of input voltage,
Can by a difference amplifier or instrument amplifier be connected to electric current loop chip xtr116/xtr115 signal defeated
Enter pin, the voltage signal of such potentiometer output can produce the signal of approximate 0 impedance after amplifier
As shown in figure 1, resistance r6 and electric capacity c11 constitutes LPF, resistance r6 and resistance r7 is used for amplifier
After process, the voltage signal of output is changed into effective input signal of electric current loop chip xtr116/xtr115.
It should be noted last that, above example is only in order to illustrate technical scheme and unrestricted.Although
With reference to embodiment, the present invention is described in detail, it will be understood by those within the art that, to the present invention
Technical scheme modify or equivalent, without departure from the spirit and scope of technical solution of the present invention, it is equal
Should cover in the middle of scope of the presently claimed invention.
Claims (4)
1. a kind of resistance testing circuit of the potentiometer for Anesthesia machine motor valve positioning is it is characterised in that include putting
Big signal conditioning circuit and electric current loop driver；The described signal conditioning circuit that amplifies is used for taking out the centre of potentiometer
After high impedance voltage signal corresponding to head is converted to voltage signal in low impedance, input to electric current loop driver；Described
Electric current loop driver pass through external power supply be potentiometer provide reference voltage, and by the voltage signal receiving change
After current signal, the transmission signal that this current signal is detected as potentiometer resistance is exported.
2. the resistance testing circuit of the potentiometer for Anesthesia machine motor valve positioning according to claim 1, its
It is characterised by, described electric current loop driver is to amplify signal conditioning circuit to power by built-in voltage-stablizer.
3. the resistance testing circuit of the potentiometer for Anesthesia machine motor valve positioning according to claim 1, its
It is characterised by, described electric current loop driver will be connect using xtr116 electric current loop chip or xtr115 electric current loop chip
The voltage signal receiving is converted to the current signal of 4ma～20ma.
4. the resistance testing circuit of the potentiometer for Anesthesia machine motor valve positioning according to claim 1, its
It is characterised by, the described signal conditioning circuit that amplifies adopts difference amplifier or instrument amplifier by the centre of potentiometer
High impedance voltage signal corresponding to tap is converted to voltage signal in low impedance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510409150.2A CN106353600A (en) | 2015-07-13 | 2015-07-13 | Resistance detection circuit of potentiometer for anesthesia apparatus motor valve positioning |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510409150.2A CN106353600A (en) | 2015-07-13 | 2015-07-13 | Resistance detection circuit of potentiometer for anesthesia apparatus motor valve positioning |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106353600A true CN106353600A (en) | 2017-01-25 |
Family
ID=57842051
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510409150.2A Pending CN106353600A (en) | 2015-07-13 | 2015-07-13 | Resistance detection circuit of potentiometer for anesthesia apparatus motor valve positioning |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106353600A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201555597U (en) * | 2009-12-10 | 2010-08-18 | 株洲振邦科技实业有限公司 | Multifunctional transducer |
| CN102162740A (en) * | 2010-12-14 | 2011-08-24 | 中国飞机强度研究所 | Transmitter |
| CN103191868A (en) * | 2013-04-07 | 2013-07-10 | 广东升威电子制品有限公司 | Automatic detection equipment for potentiometer |
-
2015
- 2015-07-13 CN CN201510409150.2A patent/CN106353600A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201555597U (en) * | 2009-12-10 | 2010-08-18 | 株洲振邦科技实业有限公司 | Multifunctional transducer |
| CN102162740A (en) * | 2010-12-14 | 2011-08-24 | 中国飞机强度研究所 | Transmitter |
| CN103191868A (en) * | 2013-04-07 | 2013-07-10 | 广东升威电子制品有限公司 | Automatic detection equipment for potentiometer |
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| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170125 |
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| RJ01 | Rejection of invention patent application after publication |