CN203122375U - Non-invasive blood pressure anti-interference circuit - Google Patents
Non-invasive blood pressure anti-interference circuit Download PDFInfo
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- CN203122375U CN203122375U CN 201320026957 CN201320026957U CN203122375U CN 203122375 U CN203122375 U CN 203122375U CN 201320026957 CN201320026957 CN 201320026957 CN 201320026957 U CN201320026957 U CN 201320026957U CN 203122375 U CN203122375 U CN 203122375U
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Abstract
The utility model relates to the field of medical detection circuit products, in particular to a non-invasive blood pressure anti-interference circuit. The non-invasive blood pressure anti-interference circuit main comprises a power circuit, a pressure sensor, an amplifying circuit, a low-pass filter circuit, an analog to digital conversion circuit and a microprocessor circuit, wherein the pressure sensor, the amplifying circuit, the low-pass filter circuit, the analog to digital conversion circuit and the microprocessor circuit are sequentially connected, and the power circuit is connected with and provides suitable voltages for the pressure sensor, the amplifying circuit and the analog to digital conversion circuit. Due to the fact that the power circuit is used for providing electricity for the pressure sensor, the amplifying circuit and the analog to digital conversion circuit, the voltages are constantly kept in a synchronous state, circuit noise interference is reduced, circuit performance is improved, and circuit cost is reduced.
Description
Technical field
This utility model relates to medical testing circuit product scope, is specifically related to a kind of non-invasive blood pressure anti-jamming circuit
Background technology
At existing armarium, as: be equipped with the non-invasive blood pressure pressure detection circuit on monitor, the electric sphygmomanometer, so that blood pressure is measured, existing non-invasive blood pressure pressure detection circuit mainly comprises pressure transducer, amplifying circuit, low-pass filter circuit, analog to digital conversion circuit, microcontroller circuit, power circuit etc.; And this power circuit by three independently power supply circuits form, be respectively the pressure transducer driving power circuit that pressure transducer provides driving voltage; The amplifying circuit bias power supply circuit of bias voltage is provided for amplifying circuit; The reference power source circuit of reference power source is provided for analog to digital conversion circuit.Because above-mentioned three's voltage is unequal in the prior art, sensor driving voltage or analog digital conversion adopt accurate reference source to supply with usually, the amplifying circuit bias voltage adopts different power supplys to supply with again, and then make pressure transducer driving voltage or amplifying circuit bias voltage asynchronous with the analog digital conversion reference voltage, it is bigger to cause circuit noise to disturb, thereby influence circuit performance, and circuit cost is higher
Summary of the invention
For overcoming above-mentioned defective, the purpose of this utility model namely is to provide a kind of non-invasive blood pressure anti-jamming circuit.
The purpose of this utility model is achieved through the following technical solutions:
This utility model is a kind of non-invasive blood pressure anti-jamming circuit, comprising:
Power circuit, and the pressure transducer that is linked in sequence successively, amplifying circuit, low-pass filter circuit, analog to digital conversion circuit, microcontroller circuit, described power circuit respectively with pressure transducer, amplifying circuit, analog to digital conversion circuit connects, so that the voltage that adapts to be provided respectively.
Further, be provided with first voltage conversion circuit between described power circuit and the pressure transducer, be provided with second voltage conversion circuit between described power circuit and the amplifying circuit.
Improve as another kind, described power circuit by builtin voltage branch road and the buffer circuit of analog to digital conversion circuit, is connected with amplifying circuit successively.
Further, also be provided with the prime filter circuit between described pressure transducer and the amplifying circuit.
As a kind of improvement, described prime filter circuit is connected with parallel resistor by the filter capacitor group and forms, and the input that this parallel resistor is arranged on the prime filter circuit is connected with pressure transducer.
Improve as another kind, described prime filter circuit is connected with magnetic bead in parallel by the filter capacitor group and forms, and the input that this magnetic bead in parallel is arranged on the prime filter circuit is connected with pressure transducer.
Improve as another kind, described prime filter circuit is connected with inductance in parallel by the filter capacitor group and forms, and the input that this inductance in parallel is arranged on the prime filter circuit is connected with pressure transducer.
Improve as another kind, described prime filter circuit is connected with common mode inductance by the filter capacitor group and forms, and the input that this common mode inductance is arranged on the prime filter circuit is connected with pressure transducer.
This utility model adopts a power circuit to be respectively pressure transducer, amplifying circuit, analog to digital conversion circuit and powers, and makes voltage keep synchronous regime constantly, thereby has reduced the circuit noise interference, has improved circuit performance, has reduced circuit cost.
Description of drawings
In order to be easy to explanation, this utility model is described in detail by following preferred embodiment and accompanying drawing.
Fig. 1 is overall structure sketch map of the present utility model;
Fig. 2 is an embodiment electrical block diagram of the present utility model;
Fig. 3 is another embodiment electrical block diagram of the present utility model;
Fig. 4 is another embodiment electrical block diagram of the present utility model;
Fig. 5 is another embodiment electrical block diagram of the present utility model.
The specific embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, this utility model is further described.Should be appreciated that specific embodiment described herein only in order to explaining this utility model, and be not used in restriction this utility model.
See also Fig. 1, this utility model is a kind of non-invasive blood pressure anti-jamming circuit, comprise: power circuit 16, and the pressure transducer 10 that is linked in sequence successively, amplifying circuit 12, low-pass filter circuit 13, analog to digital conversion circuit 14, microcontroller circuit 15, described power circuit 16 respectively with pressure transducer 10, amplifying circuit 12, analog to digital conversion circuit connects 13, so that the voltage that adapts to be provided respectively.
Further, be provided with prime filter circuit 11 between described pressure transducer 10 and the amplifying circuit 12; Since in the prior art generally behind circuit level carry out low-pass filtering design, when interfering signals such as electric knife interference, power frequency interference, Radio frequency interference enter from circuit front-end, interfering signal is rectified into low-frequency interference signal through behind the amplifier, thereby cause the interfering signal can not be by filtering, and then influence the blood pressure measurement accuracy; And this utility model is provided with prime filter circuit 11 at amplifying circuit 12 front ends, in a filtering of the advanced row of front end, effectively reduces interfering signals such as electric knife interference, power frequency interference, Radio frequency interference, has strengthened the circuit interference free performance, makes blood pressure measurement more accurate.
Because blood pressure signal belongs to small-signal, be subjected to the influence of external disturbance easily, especially the electric knife introduced of amplifier input terminal, power frequency, interfering signals such as radio frequency can be carried out rectification through behind the amplifier, be low-frequency disturbance with its rectification, thereby cause the interfering signal can not be by filtering, so the signal of pressure transducer 10 outputs at first carries out filtering through prime filter circuit 11 in this utility model, the High-frequency Interference that filtering is introduced by circuit front-end, and then enter amplifying circuit 12 and amplify, carry out filtering through low-pass filter circuit 13 again, send into analog to digital conversion circuit 13 then and gather, send into microprocessor at last and carry out date processing.For signal is adjusted in the analog-to-digital conversion process scope, so amplifying circuit 12 has increased bias voltage.
The reference voltage of analog to digital conversion circuit 14 is provided by power circuit 16, power circuit 16 is again by corresponding change-over circuit, be converted to the driving voltage of pressure transducer 10 and the bias voltage of amplifying circuit 12 respectively, thereby the reference voltage three voltage of bias voltage, analog to digital conversion circuit 14 that reaches driving voltage, the amplifying circuit 12 of pressure transducer 10 is synchronous.Because circuit power is synchronous, big or when changing when power supply noise, sensor driving voltage, amplifying circuit bias voltage, analog digital conversion reference voltage three change simultaneously, the variation of three's voltage is cancelled out each other like this, the signal that analog digital conversion is gathered is constant, disturb thereby can reduce circuit noise, improve the circuit capacity of resisting disturbance, improved circuit performance.
In order better to understand this utility model, with a concrete embodiment this utility model is described below, see also Fig. 2, be specially:
Described power circuit by builtin voltage branch road and the buffer circuit of analog to digital conversion circuit, is connected with amplifying circuit successively;
Described pressure transducer 10, be used for gathering the current pressure value, be connected with prime filter circuit 11, because its driving voltage is identical with the reference voltage of analog to digital conversion circuit 14, so the driving voltage of pressure transducer 10 adopts Vref, synchronous with the reference voltage Vref of analog to digital conversion circuit 14, disturb thereby reduce circuit noise, improve the circuit capacity of resisting disturbance.
Described prime filter circuit 11 is made up of parallel resistor R1, R2 and filter capacitor group C1, C2, C3, and the high-frequency interferencing signal that circuit front-end is introduced carries out filtering, improves the circuit capacity of resisting disturbance.Wherein R1 and R2 equivalence, C2 and C3 equivalence.R1, R2, C1, C2, C3 are used for differential mode filtering, and R1, R2, C2, C3 are used for common mode filtering.Five devices carry out value according to the circuit actual bandwidth.
12 pairs of filtered signals of described amplifying circuit amplify.The bias voltage that adopts in the amplifying circuit 12 is used for signal is adjusted in the process range of analog to digital conversion circuit 14, bias voltage adopts the builtin voltage of analog to digital conversion circuit 14, since this voltage driving force a little less than, so can improve its driving force by buffer circuit 19.Because the builtin voltage of analog to digital conversion circuit 14 is got by electric resistance partial pressure by Vref, adopt this voltage as circuit bias voltage, can make the reference voltage Vref of bias voltage and analog to digital conversion circuit 14 synchronous, disturb thereby reduce circuit noise, improve the circuit capacity of resisting disturbance.
Signal after 13 pairs of amplifications of described low-pass filter circuit carries out low-pass filtering, enters ADC then and gathers.
It is digital signal that analog-digital conversion circuit as described 14 is used for the pressure simulation conversion of signals.Its reference voltage is Vref, and Vref also is used for the driving voltage of pressure transducer 10 simultaneously.Because the builtin voltage of analog to digital conversion circuit 14 is got by electric resistance partial pressure by Vref, so adopt the builtin voltage of analog to digital conversion circuit 14 as the bias voltage of amplifying circuit 12, can make the power supply of entire circuit synchronous like this, disturb thereby reduce circuit noise, improve the circuit capacity of resisting disturbance.
Described microcontroller circuit 15 is used for the pressure signal that analog to digital conversion circuit 14 is gathered is handled.
Described power circuit 16 provides power supply for pressure transducer 10 and analog to digital conversion circuit 14, thereby makes entire circuit realize that power supply is synchronous.
In order better to understand this utility model, with another concrete embodiment this utility model is described below, see also Fig. 3, be specially:
Be provided with first voltage conversion circuit 17 between described power circuit 16 and the pressure transducer 10, be provided with second voltage conversion circuit 18 between described power circuit 16 and the amplifying circuit 12.
Described pressure transducer 10, be used for gathering the current pressure value, be connected with prime filter circuit 11, because the reference voltage of its driving voltage and analog to digital conversion circuit 14 is inequality, so the driving voltage of pressure transducer 10 adopts Vref, synchronous with the reference voltage Vref of analog to digital conversion circuit 14, disturb thereby reduce circuit noise, improve the circuit capacity of resisting disturbance.
Described prime filter circuit 11 is made up of magnetic bead FB1 in parallel, FB2 and capacitor C 1 ~ C3, and the input that this magnetic bead in parallel is arranged on the prime filter circuit is connected with pressure transducer; The high-frequency interferencing signal that circuit front-end is introduced carries out filtering, improves the circuit capacity of resisting disturbance.Wherein FB1 and FB2 same model, C2 and C3 equivalence.Electric capacity and magnetic bead are all selected according to the circuit actual bandwidth.
12 pairs of filtered signals of described amplifying circuit amplify.The bias voltage that adopts in the amplifying circuit 12 is used for signal is adjusted in the process range of analog to digital conversion circuit 14.
Signal after 13 pairs of amplifications of described low-pass filter circuit carries out low-pass filtering, enters analog to digital conversion circuit 14 then and gathers.
There is not builtin voltage in the analog-digital conversion circuit as described 14, the bias voltage of the driving voltage of pressure transducer 10 and amplifying circuit 12 all adopts analog to digital conversion circuit 14 external reference voltages, because the external reference voltage of pressure transducer driving voltage and amplifying circuit bias voltage and analog to digital conversion circuit 14 is different, so pressure transducer driving voltage and amplifying circuit bias voltage are changed through first voltage conversion circuit 17 and second voltage conversion circuit 18 respectively by the external reference voltage of analog to digital conversion circuit 14, described first voltage conversion circuit 17 and second voltage conversion circuit 18 can be circuit forms such as electric resistance partial pressure or amplifier conversion.So also can make the power supply of entire circuit synchronous, disturb thereby reduce circuit noise, improve the circuit capacity of resisting disturbance.
Described microcontroller circuit 15 is used for the pressure signal that analog to digital conversion circuit 14 is gathered is handled.
Described power circuit 16 provides power supply and bias voltage for pressure transducer 10 and analog to digital conversion circuit 14, thereby makes entire circuit realize that power supply is synchronous.
In order better to understand this utility model, with another concrete embodiment this utility model is described below, see also Fig. 4, be specially:
Be provided with first voltage conversion circuit 17 between described power circuit 16 and the pressure transducer 10, be provided with second voltage conversion circuit 18 between described power circuit 16 and the amplifying circuit 12.
Described pressure transducer 10, be used for gathering the current pressure value, be connected with prime filter circuit 11, because the reference voltage of its driving voltage and analog to digital conversion circuit 14 is inequality, so the driving voltage of pressure transducer 10 adopts Vref, synchronous with the reference voltage Vref of analog to digital conversion circuit 14, disturb thereby reduce circuit noise, improve the circuit capacity of resisting disturbance.
Described prime filter circuit 11 is made up of inductance L 1, L2 and filter capacitor group C1, C2, the C3 of prime filter circuit 11 by parallel connection, and the input that this inductance in parallel is arranged on the prime filter circuit is connected with pressure transducer; Its high-frequency interferencing signal that circuit front-end is introduced carries out filtering, improves the circuit capacity of resisting disturbance.Wherein L1 and L2 equivalence, C2 and C3 equivalence.Five devices also carry out value according to the circuit actual bandwidth.
12 pairs of filtered signals of described amplifying circuit amplify.The bias voltage that adopts in the amplifying circuit 12 is used for signal is adjusted in the process range of analog to digital conversion circuit 14.
Signal after 13 pairs of amplifications of described low-pass filter circuit carries out low-pass filtering, enters analog to digital conversion circuit 14 then and gathers.
There is not builtin voltage in the analog-digital conversion circuit as described 14, the bias voltage of the driving voltage of pressure transducer 10 and amplifying circuit 12 all adopts analog to digital conversion circuit 14 external reference voltages, because the external reference voltage of pressure transducer driving voltage and amplifying circuit bias voltage and analog to digital conversion circuit 14 is different, so pressure transducer driving voltage and amplifying circuit bias voltage are changed through first voltage conversion circuit 17 and second voltage conversion circuit 18 respectively by the external reference voltage of analog to digital conversion circuit 14, described first voltage conversion circuit 17 and second voltage conversion circuit 18 can be circuit forms such as electric resistance partial pressure or amplifier conversion.So also can make the power supply of entire circuit synchronous, disturb thereby reduce circuit noise, improve the circuit capacity of resisting disturbance.
Described microcontroller circuit 15 is used for the pressure signal that analog to digital conversion circuit 14 is gathered is handled.
Described power circuit 16 provides power supply and establishment voltage for pressure transducer 10 and analog to digital conversion circuit 14, thereby makes entire circuit realize that power supply is synchronous.
In order better to understand this utility model, with another concrete embodiment this utility model is described below, see also Fig. 5, be specially:
Be provided with first voltage conversion circuit 17 between described power circuit 16 and the pressure transducer 10, be provided with second voltage conversion circuit 18 between described power circuit 16 and the amplifying circuit 12.
Described pressure transducer 10, be used for gathering the current pressure value, be connected with prime filter circuit 11, because the reference voltage of its driving voltage and analog to digital conversion circuit 14 is inequality, so the driving voltage of pressure transducer 10 adopts Vref, synchronous with the reference voltage Vref of analog to digital conversion circuit 14, disturb thereby reduce circuit noise, improve the circuit capacity of resisting disturbance.
Described prime filter circuit 11 is made up of common mode inductance XL1 and filter capacitor group C1, C2, C3 prime filter circuit 11, the input that this common mode inductance is arranged on the prime filter circuit is connected with pressure transducer, its high-frequency interferencing signal that circuit front-end is introduced carries out filtering, improves the circuit capacity of resisting disturbance.Wherein C2 and C3 equivalence.Electric capacity and common mode inductance are all selected according to the circuit actual bandwidth.。
12 pairs of filtered signals of described amplifying circuit amplify.The bias voltage that adopts in the amplifying circuit 12 is used for signal being adjusted in the process range of analog to digital conversion circuit 14 high circuit capacity of resisting disturbance.
Signal after 13 pairs of amplifications of described low-pass filter circuit carries out low-pass filtering, enters analog to digital conversion circuit 14 then and gathers.
There is not builtin voltage in the analog-digital conversion circuit as described 14, the bias voltage of the driving voltage of pressure transducer 10 and amplifying circuit 12 all adopts analog to digital conversion circuit 14 external reference voltages, because the external reference voltage of pressure transducer driving voltage and amplifying circuit bias voltage and analog to digital conversion circuit 14 is different, so pressure transducer driving voltage and amplifying circuit bias voltage are changed through first voltage conversion circuit 17 and second voltage conversion circuit 18 respectively by the external reference voltage of analog to digital conversion circuit 14, described first voltage conversion circuit 17 and second voltage conversion circuit 18 can be circuit forms such as electric resistance partial pressure or amplifier conversion.So also can make the power supply of entire circuit synchronous, disturb thereby reduce circuit noise, improve the circuit capacity of resisting disturbance.
Described microcontroller circuit 15 is used for the pressure signal that analog to digital conversion circuit 14 is gathered is handled.
Described power circuit 16 provides power supply and works out voltage for pressure transducer 10 and analog to digital conversion circuit 14, thereby makes entire circuit realize that power supply is synchronous.
The above only is preferred embodiment of the present utility model; not in order to limit this utility model; all any modifications of within spirit of the present utility model and principle, doing, be equal to and replace and improvement etc., all should be included within the protection domain of the present utility model.
Claims (8)
1. non-invasive blood pressure anti-jamming circuit, it is characterized in that, comprise: power circuit, and the pressure transducer that is linked in sequence successively, amplifying circuit, low-pass filter circuit, analog to digital conversion circuit, microcontroller circuit, described power circuit respectively with pressure transducer, amplifying circuit, analog to digital conversion circuit connects, so that the voltage that adapts to be provided respectively.
2. non-invasive blood pressure anti-jamming circuit according to claim 1 is characterized in that, is provided with first voltage conversion circuit between described power circuit and the pressure transducer, is provided with second voltage conversion circuit between described power circuit and the amplifying circuit.
3. non-invasive blood pressure anti-jamming circuit according to claim 1 is characterized in that, described power circuit by builtin voltage branch road and the buffer circuit of analog to digital conversion circuit, is connected with amplifying circuit successively.
4. according to claim 2 or 3 described non-invasive blood pressure anti-jamming circuits, it is characterized in that, also be provided with the prime filter circuit between described pressure transducer and the amplifying circuit.
5. non-invasive blood pressure anti-jamming circuit according to claim 4 is characterized in that, described prime filter circuit is connected with parallel resistor by the filter capacitor group and forms, and the input that this parallel resistor is arranged on the prime filter circuit is connected with pressure transducer.
6. non-invasive blood pressure anti-jamming circuit according to claim 4 is characterized in that, described prime filter circuit is connected with magnetic bead in parallel by the filter capacitor group and forms, and the input that this magnetic bead in parallel is arranged on the prime filter circuit is connected with pressure transducer.
7. non-invasive blood pressure anti-jamming circuit according to claim 4 is characterized in that, described prime filter circuit is connected with inductance in parallel by the filter capacitor group and forms, and the input that this inductance in parallel is arranged on the prime filter circuit is connected with pressure transducer.
8. non-invasive blood pressure anti-jamming circuit according to claim 4 is characterized in that, described prime filter circuit is connected with common mode inductance by the filter capacitor group and forms, and the input that this common mode inductance is arranged on the prime filter circuit is connected with pressure transducer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320026957 CN203122375U (en) | 2013-01-18 | 2013-01-18 | Non-invasive blood pressure anti-interference circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320026957 CN203122375U (en) | 2013-01-18 | 2013-01-18 | Non-invasive blood pressure anti-interference circuit |
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| Publication Number | Publication Date |
|---|---|
| CN203122375U true CN203122375U (en) | 2013-08-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201320026957 Expired - Lifetime CN203122375U (en) | 2013-01-18 | 2013-01-18 | Non-invasive blood pressure anti-interference circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105186448A (en) * | 2015-10-21 | 2015-12-23 | 田子欣 | Anti-interference circuit of leakage protector |
| CN109199070A (en) * | 2017-06-30 | 2019-01-15 | 佛山市顺德区美的电热电器制造有限公司 | Cooking apparatus, air hose leakage detection method, computer equipment |
-
2013
- 2013-01-18 CN CN 201320026957 patent/CN203122375U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105186448A (en) * | 2015-10-21 | 2015-12-23 | 田子欣 | Anti-interference circuit of leakage protector |
| CN109199070A (en) * | 2017-06-30 | 2019-01-15 | 佛山市顺德区美的电热电器制造有限公司 | Cooking apparatus, air hose leakage detection method, computer equipment |
| CN109199070B (en) * | 2017-06-30 | 2021-07-20 | 佛山市顺德区美的电热电器制造有限公司 | Cooking appliance, air duct leakage detection method and computer equipment |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130814 |
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| CX01 | Expiry of patent term |