CN109839855A - A kind of control circuit of ultrasound lung function instrument - Google Patents
A kind of control circuit of ultrasound lung function instrument Download PDFInfo
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- CN109839855A CN109839855A CN201711201697.9A CN201711201697A CN109839855A CN 109839855 A CN109839855 A CN 109839855A CN 201711201697 A CN201711201697 A CN 201711201697A CN 109839855 A CN109839855 A CN 109839855A
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Abstract
The present invention relates to medical ultrasonic Instrument technology fields, specifically disclose a kind of control circuit of ultrasonic lung function instrument, including MCU module, GP22 chip；The MCU module is configured with GP22 chip；The GP22 chip is set there are four pin, respectively FIRE UP pin, STOP1 pin, FIRE DOWN pin, STOP2 pin；The FIRE UP pin is connect with pulse generating circuit 1, is connect through probe 1 with switching switch K1, the switching switch K1 is connect by a capacitance with the input terminal of amplifying circuit 1, is connect after amplifying circuit 1 with STOP1 pin；The FIRE DOWN pin is connect with pulse generating circuit 2, is connect through probe 2 with switching switch K2, the switching switch K2 is connect by a capacitance with the input terminal of amplifying circuit 2, is connect after amplifying circuit 2 with STOP2 pin；The MCU module is set there are two I/O pin, is connect respectively with the control terminal of switching switch K1, K2.Hardware cost reduces, and eliminates software programming, shortens the development cycle, reduces Time To Market.
Description
Technical field
The present invention relates to medical ultrasonic Instrument technology fields, particularly relate to a kind of control circuit of ultrasonic lung function instrument.
Background technique
After ultrasonic lung function instrument passes through the gas of tested person's breathing by measuring ultrasonic pulse signal from different directions
Time difference, the actual flow velocity of gas is conversed, to obtain the indices parameter of tested person's lung function.The ultrasound of current main-stream
Lung function instrument is all made of FPGA or CPLD as core control and operation circuit.Due to receive waveform be analog quantity, need into
The consistent digital signal of IO level with FPGA or CPLD is first converted to before entering FPGA or CPLD.There are two ways to conversion,
One is comparator is used, digital quantity is converted for analog quantity by zero passage detection；Another kind will be believed using AD conversion chip
Number and noise be first converted into digital quantity, pass through algorithm judgement signal and noise in FPGA or CPLD.Former approach requires
Signal-to-noise ratio is very high before comparator, and latter does not require the signal-to-noise ratio for having too high before AD conversion then.Both methods it is hard
Part cost is higher, and writing for software is also complex.
Summary of the invention
The object of the present invention is to provide a kind of control circuits of ultrasonic lung function instrument, save hardware cost, and eliminate
Software programming work, shortens the development cycle, reduces Time To Market.
To achieve the goals above, present invention employs technical solutions below: a kind of control electricity of ultrasound lung function instrument
Road, including MCU module, for the GP22 chip of core control and operation；
The MCU module is configured with GP22 chip；
The GP22 chip is set there are four pin, respectively FIREUP pin, STOP1 pin, FIREDOWN pin,
STOP2 pin；
The FIREUP pin is connect with pulse generating circuit 1, is connect through probe 1 with switching switch K1, the switching is opened
It closes K1 to connect by a capacitance with the input terminal of amplifying circuit 1, be connect after amplifying circuit 1 with STOP1 pin；
The FIREDOWN pin is connect with pulse generating circuit 2, is connect through probe 2 with switching switch K2, the switching
Switch K2 is connect by a capacitance with the input terminal of amplifying circuit 2, is connect after amplifying circuit 2 with STOP2 pin；
The MCU module is set there are two I/O pin, is connect with the control terminal of switching switch K1, K2, is cut respectively for control
Change the on-off of switch K1 and 1 and 3.3V level of popping one's head in or the on-off of K2 and probe 2 and 3.3V level.
The beneficial effects of the present invention are: using after above system, which includes comparator, passes through zero passage
Judgement is to extract signal；Chip is automatically performed the algorithm function of FPGA or CPLD, to eliminate software programming；It is opened using two-way
Pass can guarantee that the vacant state of receiving end is most short, and the noise jamming being subject to is minimum, save hardware cost in this way, and exempt
Software programming work, shortens the development cycle, reduces Time To Market.
Detailed description of the invention
Technical solution in order to illustrate the embodiments of the present invention more clearly, below will be to needed in embodiment description
Attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is only the present invention in order to illustrate more clearly of this hair
Bright embodiment or technical solution in the prior art, below will be p- required for describing the embodiments or the prior art attached
Figure is briefly described, for those of ordinary skill in the art, without creative efforts, can be with root
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the circuit hardware structure chart of current main-stream ultrasound lung function instrument；
Fig. 2 is the present invention using circuit hardware structure chart of the GP22 as core control and operation chip；
Fig. 3 is the control waveform diagram of present invention switching switch.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The circuit hardware structure of current main-stream ultrasound lung function instrument as shown in Figure 1, since gas declines to ultrasonic signal
Subtract amplitude all very littles of very big, to directly receive from probe signal, typically less than 5 millivolts, such signal can not carry out
Subsequent measurement, it is therefore desirable to amplify.The signal that two-way receives is sentenced after noise reduction using the zero passage of comparator through enhanced processing
It is disconnected, it is just input in the form of pulse signal in FPGA or CPLD, FPGA or CPLD carry out related operation, finally obtain the time
Difference, the circuit using the double modes received of double hairs, that is, pop one's head in 1 transmitting when probe 2 receive, and pop one's head in 2 transmitting when probe 1 receive.
A kind of control circuit of ultrasonic lung function instrument as shown in Figure 2, substitutes FPGA or CPLD using GP22, can save
Comparison circuit or A/D converter circuit.Since the transmitting terminal of GP22 has high-impedance state, receiving terminal circuit is easily coupled to noise.If
Signal-to-noise ratio is too small, and GP22 will be unable to recognize signal, it is therefore necessary to try to reduce the noise for receiving circuit.Two-way receives circuit
Per an electronic switch is added all the way, by the software of MCU come the switching of control switch.Receiving time section by switching to visit
Head, the non-reception time is by switching to 3.3V.Switch is connected by the input terminal of a capacitance and amplifier.Two-way is put
The output end of big device is then connect with STOP1, STOP2 pin of GP22 respectively.The control terminal of switch K1, K2 are connected respectively to MCU
Two I/O pins, switching controlled by MCU.When due to being switched to probe, the input terminal for receiving circuit does not have compulsory direct current
Level is in vacant state, and vulnerable to noise jamming.Therefore, being switched to should be short as far as possible with the state of probe connection.This will
It asks, on the basis of guaranteeing to receive signal leading edge, shortening receiving end and antenna binding time, extension are electric with 3.3V as far as possible
Flat binding time.
The present invention by MCU come the switching of control switch, since MCU also controls the configuration of GP22, in timing just
In time difference control switching and receive waveform.From the time point being switched to probe connection is connect with 3.3V, originated in pulse
After launch time, controlled by MCU.MCU can issue emit pulse command after, by it is appropriate delay issue again from
3.3V connection is switched to the instruction of probe, due to being delayed in Microsecond grade, can be realized by several non-operation instructions.Delay
Accomplish the closest forward position for receiving waveform of switching time point, while can't influence to receive the integrality in waveform forward position, it is ensured that
Do not influence measurement result.For example, it is divided into 20uS between the transmitting-receiving pulse aerial shortest time in the measurement range of instrument,
Switch in this 20uS will be made to connect as far as possible with 3.3V, therefore switching time point should be as far as possible in the last of this 20uS.If MCU machine
Device frequency is 24MHz, and single instrction frequency is 2MHz, then single command cycle is 0.5uS, and 20uS is 40 single command cycles.?
After issuing impulse ejection instruction, MCU executes 40 non-operation instructions, just realizes delay 20uS.In order to ensure receiving the complete of signal
Whole property, we, which are set in issue after impulse ejection instructs, executes 18 non-operation instructions, then issues switching instruction, is switched to
It receives circuit input end and probe connects.GP22 once receives signal, just issues interrupt requests, the interrupt response of MCU to MCU
Subprogram will be switched to probe connection connect with 3.3V again.FIREUP the and FIREDOWN pin of GP22 is sent out respectively as pulse
The control signal input of raw device 1 and impulse generator 2.The control waveform of switch is as shown in Figure 3.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (1)
1. a kind of control circuit of ultrasound lung function instrument, it is characterised in that: including MCU module, for core control and operation
GP22 chip；
The MCU module is configured with GP22 chip；
The GP22 chip is set there are four pin, and respectively FIREUP pin, STOP1 pin, FIRE DOWN pin, STOP2 draws
Foot；
The FIREUP pin is connect with pulse generating circuit 1, is connect through probe 1 with switching switch K1, the switching switch K1
It is connect by a capacitance with the input terminal of amplifying circuit 1, is connect after amplifying circuit 1 with STOP1 pin；
The FIREDOWN pin is connect with pulse generating circuit 2, is connect through probe 2 with switching switch K2, the switching switch
K2 is connect by a capacitance with the input terminal of amplifying circuit 2, is connect after amplifying circuit 2 with STOP2 pin；
The MCU module is set there are two I/O pin, connect respectively with the control terminal of switching switch K1, K2, is switched for control and open
Close the on-off of K1 and 1 and 3.3V level of popping one's head in or the on-off of K2 and probe 2 and 3.3V level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711201697.9A CN109839855A (en) | 2017-11-27 | 2017-11-27 | A kind of control circuit of ultrasound lung function instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711201697.9A CN109839855A (en) | 2017-11-27 | 2017-11-27 | A kind of control circuit of ultrasound lung function instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109839855A true CN109839855A (en) | 2019-06-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711201697.9A Pending CN109839855A (en) | 2017-11-27 | 2017-11-27 | A kind of control circuit of ultrasound lung function instrument |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113558659A (en) * | 2021-07-30 | 2021-10-29 | 重庆安酷科技有限公司 | High-precision ultrasonic lung function detector and detection method thereof |
-
2017
- 2017-11-27 CN CN201711201697.9A patent/CN109839855A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113558659A (en) * | 2021-07-30 | 2021-10-29 | 重庆安酷科技有限公司 | High-precision ultrasonic lung function detector and detection method thereof |
| CN113558659B (en) * | 2021-07-30 | 2023-07-04 | 重庆安酷科技有限公司 | High-precision ultrasonic lung function detector and detection method thereof |
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Application publication date: 20190604 |