CN106026978A - PWM circuit duty ratio adjusting method and system of blood pressure measuring device - Google Patents

PWM circuit duty ratio adjusting method and system of blood pressure measuring device Download PDF

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Publication number
CN106026978A
CN106026978A CN201610316287.8A CN201610316287A CN106026978A CN 106026978 A CN106026978 A CN 106026978A CN 201610316287 A CN201610316287 A CN 201610316287A CN 106026978 A CN106026978 A CN 106026978A
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duty ratio
air pressure
pwm circuit
time
blood pressure
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CN106026978B (en
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高平东
郑洪涛
李世兴
李国春
李艳峰
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Guangzhou Shiyuan Electronics Thecnology Co Ltd
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Guangzhou Shiyuan Electronics Thecnology Co Ltd
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Priority to PCT/CN2016/113116 priority patent/WO2017193594A1/en
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/01—Details
    • H03K3/017—Adjustment of width or dutycycle of pulses
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/02—Detecting, measuring or recording for evaluating the cardiovascular system, e.g. pulse, heart rate, blood pressure or blood flow
    • A61B5/021—Measuring pressure in heart or blood vessels
    • A61B5/02141—Details of apparatus construction, e.g. pump units or housings therefor, cuff pressurising systems, arrangements of fluid conduits or circuits
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/02—Detecting, measuring or recording for evaluating the cardiovascular system, e.g. pulse, heart rate, blood pressure or blood flow
    • A61B5/021—Measuring pressure in heart or blood vessels
    • A61B5/022—Measuring pressure in heart or blood vessels by applying pressure to close blood vessels, e.g. against the skin; Ophthalmodynamometers

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Cardiology (AREA)
  • Vascular Medicine (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Physiology (AREA)
  • Biophysics (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Veterinary Medicine (AREA)
  • Physics & Mathematics (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
  • Ophthalmology & Optometry (AREA)

Abstract

The invention relates to a duty ratio adjusting method and a duty ratio adjusting system of a PWM circuit of a blood pressure measuring device. The duty ratio adjusting method of the PWM circuit of the blood pressure measuring device comprises the following steps: when the blood pressure measuring device works, acquiring real-time air pressure in the cuff; calculating the duty ratio of a PWM circuit in the blood pressure measuring device according to the real-time air pressure and the duty ratio-air pressure relation model; wherein the duty ratio-air pressure relation model represents a functional relation between the duty ratio and the air pressure when the rising speed of the air pressure in the cuff is constant; and adjusting the working duty ratio of the PWM circuit according to the duty ratio. The PWM circuit duty ratio adjusting method and system of the blood pressure measuring device provided by the invention can be suitable for various types or models of blood pressure measuring devices, have a higher adjusting effect, and ensure the working stability of the PWM circuit.

Description

PWM circuit duty ratio adjusting method and system of blood pressure measuring device
Technical Field
The invention relates to the technical field of electronics, in particular to a duty ratio adjusting method and system for a PWM circuit of a blood pressure measuring device.
Background
In a blood pressure measuring device such as an electronic sphygmomanometer using an ascent method, it is generally necessary to keep a constant rate of rise of air pressure in a cuff of the blood pressure measuring device in order to improve accuracy and stability of measurement. The constant pressurizing speed can reduce the interference of the air pump on the measurement result, and a stable signal is obtained. To achieve constant pressurization, control of the air pump is particularly important. The air pump is generally driven by a PWM circuit, and the inflating power of the air pump can be adjusted by adjusting the duty ratio of PWM, so that the constant acceleration of the air pressure in the cuff is realized.
In the traditional scheme, the duty ratio of the PWM circuit can be adjusted according to parameters such as pressurization time by using related control algorithms, however, the control algorithms adopted by different types or models of blood pressure measuring devices are different, so that the adjustment schemes of the duty ratio of the PWM circuit are different, and the adjustment effect of the duty ratio is easily influenced.
Disclosure of Invention
Therefore, it is necessary to provide a method and a system for adjusting the duty ratio of the PWM circuit of the blood pressure measuring device, aiming at the technical problem that the conventional scheme easily affects the duty ratio adjusting effect.
A duty ratio adjusting method of a PWM circuit of a blood pressure measuring device comprises the following steps:
when the blood pressure measuring device works, acquiring real-time air pressure in the cuff;
calculating the duty ratio of a PWM circuit in the blood pressure measuring device according to the real-time air pressure and the duty ratio-air pressure relation model; wherein the duty ratio-air pressure relation model represents a functional relation between the duty ratio and the air pressure when the rising speed of the air pressure in the cuff is constant;
and adjusting the working duty ratio of the PWM circuit according to the duty ratio.
The duty ratio adjusting method of the PWM circuit of the blood pressure measuring device can determine the duty ratio of the PWM circuit according to the real-time air pressure and the duty ratio-air pressure relation model, realizes the adjustment of the duty ratio of the PWM circuit, wherein the adjustment of the duty ratio is mainly influenced by the real-time air pressure in the corresponding sleeve belt, can be suitable for various types or models of blood pressure measuring devices, has higher adjusting effect, and ensures the working stability of the PWM circuit.
In an embodiment, the method for adjusting the duty ratio of the PWM circuit of the blood pressure measuring apparatus may further include:
controlling the PWM circuit to respectively inflate the experimental gas capacity under the conditions of a plurality of set duty ratios;
respectively acquiring a function relation between the rising speed and the air pressure in the experimental air volume in the process of inflating the experimental air volume for each time to obtain a rising speed-air pressure relation model;
and obtaining the relationship between the duty ratio and the air pressure when the air pressure in the experimental air volume is constant from the rising speed-air pressure relationship model to obtain the duty ratio-air pressure relationship model.
According to the duty ratio adjusting method of the PWM circuit of the blood pressure measuring device, when the PWM circuit inflates the experimental air volume with different set duty ratios, the rising speed-air pressure relation model between the rising speed of the air pressure in the experimental air volume and the air pressure is obtained, so that the corresponding duty ratio-air pressure relation model is obtained, and the accuracy of the obtained duty ratio-air pressure relation model can be improved.
In one embodiment, the duty ratio-air pressure relationship model includes D ═ a × P + D; wherein P is the air pressure in the cuff, D is the duty ratio of the PWM circuit, a is a first coefficient of the duty ratio-air pressure relation model, and D is a second coefficient of the duty ratio-air pressure relation model.
In this embodiment, the duty ratio-air pressure relationship model is simplified into a linear relationship model where D is a × P + D, so that the efficiency of obtaining the corresponding duty ratio through the duty ratio-air pressure relationship model can be improved.
In an embodiment, the method for adjusting the duty ratio of the PWM circuit of the blood pressure measuring apparatus may further include:
when the rising speed of the air pressure in the experimental air volume is constant, a plurality of groups (P) corresponding to the ith experimental air volume are obtainedi，Di) According to a plurality of groups (P)i，Di) Determining D corresponding to ith experimental gas capacityi＝a×PiFirst coefficient a in + diAnd a second coefficient di(ii) a Wherein D isiRepresents the duty ratio, P, of the PWM circuit corresponding to the ith experimental gas capacityiRepresents a duty ratio of the PWM circuit as DiThen, the air pressure in the corresponding experimental air volume;
according to each aiAnd diAnd determining the a and the d.
In this embodiment, when the rising speed of the air pressure in the experimental air volume is constant, a plurality of experimental air volumes are obtained respectivelyCorresponding multiple groups (P)i，Di) Therefore, a first coefficient and a second coefficient corresponding to each experimental gas capacity are determined, and then corresponding coefficients of the duty ratio-air pressure relation model are determined according to the first coefficients and the second coefficients respectively, so that the reasonability of the determined coefficients can be ensured.
As an example, the above is according to each aiAnd diThe step of determining a and d comprises:
according to each aiAnd formulasCalculating a;
according to each diAnd formulasD is calculated; wherein i is an integer of more than or equal to 1 and less than or equal to k, and k represents the number of different experimental gas volumes.
In an embodiment, the method for adjusting the duty ratio of the PWM circuit of the blood pressure measuring apparatus may further include:
selecting n moments with equal intervals in a set time period;
respectively obtaining the air pressure P [ j ] in the cuff at each moment; wherein j is an integer which is more than or equal to 1 and less than or equal to n, and Pj is the air pressure in the sleeve at the jth moment;
according to the air pressure in the cuff at each time and the formula Delta S [ j +1]＝S0-(P[j+1]-P[j]) Calculating the air pressure rising speed deviation at the j +1 th moment; wherein, Δ S [ j +1]Is the deviation of the air pressure rising speed at the j +1 th time, Pj +1]Air pressure in the cuff at the (j + 1) th moment, S0The air pressure is a preset air pressure rising speed;
according to Δ S [ j +1]And formulasCalculating the set timeAverage boost speed deviation within a segment; wherein,average boosting speed deviation in a set time period;
according to Δ S [ j +1]、And formulasCalculating a fine adjustment coefficient; where Δ d is a trimming coefficient, kmRepresenting a preset fine tuning proportion parameter;
and updating the second coefficient to d + delta d according to the fine tuning coefficient.
In the embodiment, the fine adjustment coefficient is determined according to the air pressure in the cuff and the corresponding air pressure rising speed at a plurality of moments in the use process of the blood pressure measuring device so as to update the second coefficient, and the accuracy of the determined duty ratio-air pressure relation model is further improved.
In one embodiment, after acquiring the real-time air pressure in the cuff, the method further comprises:
and filtering the high-frequency signals in the real-time air pressure by a low-pass filter.
The embodiment can filter high-frequency signals in real-time air pressure, reduce the influence of noise signals such as the high-frequency signals on the duty ratio acquisition process, and improve the accuracy of the acquired duty ratio.
As an embodiment, the low pass filter includes:
Pout[m]＝b1×Pin[m]+b2×Pin[m-1]+b3×Pin[m-2]-b4×Pout[m-1]-b5×Pout[m-2]；
wherein, Pin[m]Is a low-pass filterInput air pressure at time Pout[m]Is the output air pressure, P, of the low-pass filter at the current momentin[m-1]Is the input air pressure of the low-pass filter at the first moment, Pout[m-1]Is the output air pressure of the low-pass filter at the first time, Pin[m-2]Input air pressure, P, of the low-pass filter at the second momentout[m-2]Is the output air pressure of the low-pass filter at the second moment, b1、b2、b3、b4And b5The filter coefficients are respectively, the first time is a time before the current time, and the second time is a time before the first time.
In an embodiment, the step of calculating the duty ratio of the PWM circuit in the blood pressure measuring device according to the real-time air pressure and the duty ratio-air pressure relationship model further includes:
detecting whether the duty cycle is in a duty cycle interval [ D ]min，Dmax]Internal; wherein D isminIs the lower limit of the duty cycle of the PWM circuit, DmaxThe duty ratio upper limit value of the PWM circuit;
if the duty ratio exceeds DmaxThen set the duty cycle to Dmax；
If the duty ratio is less than DminThen set the duty cycle to Dmin。
In the embodiment, the excessively large duty ratio is set as the upper limit value of the duty ratio of the PWM circuit, and the excessively small duty ratio is set as the lower limit value of the duty ratio of the PWM circuit, so that the duty ratio of the PWM circuit can be maintained in a corresponding working range, and the safety of the PWM circuit can be ensured.
As an embodiment, the step of calculating the duty ratio of the PWM circuit in the blood pressure measuring device according to the real-time air pressure and the duty ratio-air pressure relationship model further includes:
acquiring the duty ratio of a PWM circuit at a first moment; the first moment is a moment before the current moment;
according to the formulaUpdating the duty ratio of the current moment; wherein, D [ m ]]Is the updated duty cycle at the present time,duty ratio output for the current time duty ratio-air pressure relation model, Dm-1]Is the duty cycle at the first time;
and determining the working duty ratio of the PWM circuit according to the updated duty ratio.
The embodiment can update the duty ratio of the corresponding PWM circuit according to the duty ratio of the previous moment of the current moment, so that the duty ratio regulation is correspondingly adjusted according to the working state of the previous moment of the PWM circuit, and the reasonability of the determined duty ratio is further ensured.
A PWM circuit duty cycle adjustment system of a blood pressure measurement device, comprising:
the first acquisition module is used for acquiring real-time air pressure in the cuff when the blood pressure measuring device works;
the second acquisition module is used for calculating the duty ratio of a PWM circuit in the blood pressure measuring device according to the real-time air pressure and the duty ratio-air pressure relation model; wherein the duty ratio-air pressure relation model represents a functional relation between the duty ratio and the air pressure when the rising speed of the air pressure in the cuff is constant;
and the determining module is used for adjusting the working duty ratio of the PWM circuit according to the duty ratio.
The duty ratio adjusting system of the PWM circuit of the blood pressure measuring device can determine the duty ratio of the PWM circuit according to the real-time air pressure and the duty ratio-air pressure relation model, realizes the adjustment of the duty ratio of the PWM circuit, is mainly influenced by the real-time air pressure in the corresponding sleeve belt, can be suitable for various types or models of blood pressure measuring devices, has higher adjusting effect, and ensures the working stability of the PWM circuit.
Drawings
FIG. 1 is a flowchart of a PWM circuit duty cycle adjustment method of a blood pressure measurement device according to an embodiment;
FIG. 2 is a schematic diagram of an experimental gas capacity P-T relationship according to one embodiment;
FIG. 3 is a schematic diagram of an experimental gas capacity W-P relationship according to an embodiment;
FIG. 4 is a schematic diagram of W-P relationships corresponding to different experimental gas volumes for one embodiment;
FIG. 5 is a schematic comparison of air pressure curves before and after filtering according to one embodiment;
FIG. 6 is a schematic diagram of an embodiment of analyzing operating data of a blood pressure measuring device;
fig. 7 is a schematic structural diagram of a PWM circuit duty cycle adjusting system of a blood pressure measuring device according to an embodiment.
Detailed Description
The following describes in detail specific embodiments of the PWM circuit duty cycle adjusting method and system of the blood pressure measuring device according to the present invention with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a flowchart illustrating a method for adjusting a duty cycle of a PWM circuit of a blood pressure measuring device according to an embodiment, including the following steps:
s10, acquiring real-time air pressure in the cuff when the blood pressure measuring device works;
the blood pressure measuring device generally comprises an air pump, a pressure sensor, a cuff, a controller and the like, wherein the air pump can be correspondingly driven and controlled through a PWM circuit, so that parameters such as the inflation quantity or the inflation speed of the cuff can be controlled, the pressure sensor can measure the real-time air pressure in the cuff and send the real-time air pressure to the controller, and the controller can acquire the real-time air pressure in the cuff to perform corresponding monitoring and other processing. The controller can set or adjust the duty ratio of the PWM circuit to control the driving power of the corresponding air pump, so that the air pressure rising speed is adjusted.
S20, calculating the duty ratio of a PWM circuit in the blood pressure measuring device according to the real-time air pressure and the duty ratio-air pressure relation model; wherein the duty ratio-air pressure relation model represents a functional relation between the duty ratio and the air pressure when the rising speed of the air pressure in the cuff is constant;
the duty ratio-air pressure relation model can represent the functional relation between the duty ratio of the PWM circuit and the air pressure in the cuff when the rising speed of the air pressure in the cuff is constant, the duty ratio calculated according to the real-time air pressure and the duty ratio-air pressure relation model is only influenced by the real-time air pressure in the cuff, and the duty ratio-air pressure relation model is irrelevant to factors such as the type or the model of the blood pressure measuring device, and can be suitable for the adjustment of the duty ratio of the PWM circuit of various blood pressure measuring devices.
The cuff of the blood pressure measuring device is an elastic air volume, the air volume of the cuff can be changed within a certain range (for example, 500mL to 1500mL) along with the inflation state, when the duty ratio-air pressure relation model is obtained, in order to construct a stable working environment, a non-elastic air volume can be selected as an experimental air volume, such as a rigid air volume and the like, and under certain experimental conditions, the experimental air volume is inflated to obtain data such as air pressure, duty ratio, air pressure rising speed and the like in the inflation process, so that the duty ratio-air pressure relation model is obtained. For example, the duty ratio-air pressure relationship model may be obtained by obtaining the air pressure and the air pressure rising speed in the experimental air volume when the PWM circuit operates at different duty ratios, and then performing curve fitting, drawing analysis, and the like on the related air pressure data and the duty ratio characteristics.
And S30, adjusting the working duty ratio of the PWM circuit according to the duty ratio.
The method for adjusting the duty ratio of the PWM circuit of the blood pressure measuring device according to the present embodiment can determine the duty ratio of the PWM circuit according to the real-time air pressure and the duty ratio-air pressure relationship model, and implement adjustment of the duty ratio of the PWM circuit, wherein the adjustment of the duty ratio is mainly affected by the real-time air pressure in the corresponding cuff, and the method can be applied to various types or models of blood pressure measuring devices, has a high adjustment effect, and ensures the working stability of the PWM circuit.
In an embodiment, the method for adjusting the duty ratio of the PWM circuit of the blood pressure measuring apparatus may further include:
controlling the PWM circuit to respectively inflate the experimental gas capacity under the conditions of a plurality of set duty ratios;
respectively acquiring a function relation between the rising speed and the air pressure in the experimental air volume in the process of inflating the experimental air volume for each time to obtain a rising speed-air pressure relation model;
and obtaining the relationship between the duty ratio and the air pressure when the air pressure in the experimental air volume is constant from the rising speed-air pressure relationship model to obtain the duty ratio-air pressure relationship model.
The set duty ratio may be set within an effective duty ratio range (between a lower duty ratio limit value and an upper duty ratio limit value) of the PWM circuit, and in order to improve the efficiency of obtaining the ascending speed-air pressure relationship model, intervals between two adjacent set duty ratios may be set to be equal intervals, for example, a plurality of set duty ratios are respectively set to be 16%, 20%, 24%, 28%, 32%, and the like, and then the PWM circuit is sequentially operated under the condition of the plurality of set duty ratios.
In this embodiment, when the PWM circuit inflates the experimental gas volume with different set duty ratios, the rising speed-air pressure relationship model between the air pressure rising speed and the air pressure in the experimental gas volume is obtained, so as to obtain the corresponding duty ratio-air pressure relationship model, which can improve the accuracy of the obtained duty ratio-air pressure relationship model.
As an example, if the plurality of set duty ratios are set to 16%, 20%, 24%, 28%, and 32%, respectively, the PWM circuit may be enabled to sequentially inflate the experimental gas volume under the above duty ratios, and a relationship (P-T relationship) between the gas pressure P and the inflation time T in the experimental gas volume when the PWM operates at each duty ratio is obtained. The P-T relationship may be as shown in fig. 2, where in fig. 2, the abscissa may represent time T in units of S (seconds), and the ordinate represents pressure P in units of mmHg (pressure corresponding to 1 mm of mercury), and according to the P-T relationship, the gas pressure rising speed W corresponding to each pressure P in the experimental gas container may be calculated, so that the relationship (W-P relationship) between the gas pressure rising speed W and the pressure P under each duty ratio condition may be determined. Fitting the above W-P relationship to a W-P curve for each duty cycle, as shown in figure 3, in FIG. 3, the abscissa represents the gas pressure P in mmHg, the ordinate represents the gas pressure rising speed W in the experimental gas volume in mmHg/S (pressure per second corresponding to mmHg), from the W-P relationship corresponding to FIG. 3, a plurality of sets (P, D) corresponding to a constant rise rate of the air pressure in the experimental air volume can be obtained, for example, when the rise rate of the air pressure is 5mmHg/S, corresponding sets (P, D) (intersections of the straight lines corresponding to the 5mmHg/S gas pressure rise rate shown in fig. 3 and the W-P curves) can be obtained from the above-mentioned sets (P, D) as the relationship between the duty ratio and the gas pressure when the gas pressure rise rate in the experimental gas container is constant, that is, the above-mentioned duty ratio-gas pressure relationship model.
It can be seen from the W-P curves shown in FIG. 3 that when the intervals between two adjacent set duty ratios are equal and the rising speed of the air pressure in the experimental gas chamber is constant (for example, 4mmHg/S, 5mmHg/S and 6mmHg/S), the values of the intervals between two adjacent W-P curves are substantially equal, for example, when W is 5mmHg/S, the gas pressure interval between the W-P curve corresponding to the 16% duty ratio and the W-P curve corresponding to the 20% duty ratio, the gas pressure interval between the W-P curve corresponding to the 20% duty ratio and the W-P curve corresponding to the 24% duty ratio, and the gas pressure intervals between the other two adjacent W-P curves are equal, therefore, a direct ratio relationship exists between the variation of the duty ratio and the variation of the air pressure in the experimental air volume, and the relationship between the duty ratio and the air pressure can be approximate to a linear relationship.
To further simplify the duty-to-air pressure relationship model, in one embodiment, the duty-to-air pressure relationship model may be set to D ═ a × P + D; wherein, P is the air pressure in the experimental air volume or the cuff, D is the duty ratio of the PWM circuit, a is the first coefficient of the duty ratio-air pressure relation model, and D is the second coefficient of the duty ratio-air pressure relation model.
In this embodiment, the duty ratio-air pressure relationship model is simplified into a linear relationship model where D is a × P + D, so that the efficiency of obtaining the corresponding duty ratio through the duty ratio-air pressure relationship model can be improved. The first coefficient a and the second coefficient D may be determined by obtaining a duty ratio of a PWM circuit and a corresponding air pressure when an experimental air volume or an air pressure rise speed in the cuff is constant, and performing a correlation calculation by substituting D ═ a × P + D.
As an embodiment, the method for adjusting the duty ratio of the PWM circuit of the blood pressure measuring apparatus may further include:
when the rising speed of the air pressure in the experimental air volume is constant, a plurality of groups (P) corresponding to the ith experimental air volume are obtainedi，Di) According to a plurality of groups (P)i，Di) Determining D corresponding to ith experimental gas capacityi＝a×PiFirst coefficient a in + diAnd a second coefficient di(ii) a Wherein D isiRepresents the duty ratio, P, of the PWM circuit corresponding to the ith experimental gas capacityiRepresents a duty ratio of the PWM circuit as DiThen, the air pressure in the corresponding experimental air volume;
according to each aiAnd diAnd determining the a and the d.
The air volume of the cuff in the blood pressure measuring device can be changed within a certain range along with the inflation state (the air volume of the cuff is usually between 500mL and 1500 mL); in order to construct a stable experimental environment, inelastic gas volumes such as rigid gas volumes and the like can be selected as experimental gas volumes, and relevant experiments are carried out to obtain the duty ratio-air pressure relation model. The volume of the experimental air volume can be matched with the blood pressure measuring deviceThe cuff air volume of (1) is consistent in variation range, such as 500mL (milliliter), 700mL, 900mL, 1100mL, 1300mL, 1500mL and the like. K experimental gas volumes can be selected from the plurality of experimental gas volumes, and when the rising speed of the air pressure in the experimental gas volumes is constant, a plurality of groups (P) corresponding to the i (i ═ 1, 2.., k) th experimental gas volumes can be obtainedi，Di) For the ith experiment, a plurality of groups (P) corresponding to the gas capacitiesi，Di) Fitting is performed to obtain a corresponding first coefficient aiAnd a second coefficient di. At the time of obtaining a plurality of aiAnd diThen, can be according to the above aiDetermining a according to diDetermining d, e.g. after removing a1To akAfter the maximum value and the minimum value between the two values, the rest a is obtainediThe average value of (1) is determined as a; or a eachiThe median value of (a) is determined as a, etc.
In the process of determining the first coefficient a and the second coefficient d, the inflation speed of the corresponding experimental air volume can be controlled through the related inflation quantity control device to realize the control of the rising speed of the air pressure in the experimental air volume, so that the corresponding rising speed of the air pressure is kept constant, and the corresponding P is obtainedi，Di. The step of acquiring a plurality of sets (P, D) corresponding to the respective experimental gas volumes when the rising speed of the gas pressure in the experimental gas volumes is constant may include:
enabling the PWM to inflate each experimental gas container at a set duty ratio, and obtaining the relation (P-T relation) between the air pressure P and the inflation time T in the experimental gas container when the PWM works at each duty ratio;
according to the P-T relation, calculating the air pressure rising speed W corresponding to each pressure P in the experimental air volume, thereby determining the relation (W-P relation) between the air pressure rising speed W and the pressure P under each duty ratio condition;
a plurality of sets (P, D) corresponding to a constant rise speed of the air pressure in the test gas atmosphere (W is constant) are obtained from the W-P relationship.
As an example, the above is according to each aiAnd diThe step of determining a and d may comprise:
according to each aiAnd formulasCalculating a;
according to each diAnd formulasD is calculated; wherein i is an integer of more than or equal to 1 and less than or equal to k, and k represents the number of different experimental gas volumes.
The embodiment is based on a plurality of aiDetermines a from a plurality of diD is determined by the average value of the two, and the accuracy of the determined a and d can be ensured.
In practical applications, the cuff of the blood pressure measuring apparatus is an elastic air volume, the air volume of which can be changed within a certain range with the inflation state, and the first coefficient and the second coefficient in the duty ratio-air pressure relation model are determined based on an inelastic experimental air volume, in order to verify the reasonability of the determined first coefficient and second coefficient, in one embodiment, the inflation experiment can be performed on a plurality of experimental air volumes with different air volumes under a plurality of set duty ratio conditions, for example, the first experimental air volume and the second experimental air volume with different air volumes are sequentially inflated under the working conditions of 16%, 20%, 24%, 28% and 32% duty ratios of the PWM circuit, the W-P relation corresponding to the first experimental air volume and the second experimental air volume is fitted to corresponding curves, as shown in fig. 4, the abscissa represents the air pressure P, the unit is mmHg, the ordinate represents the rising speed W of the air pressure in the experimental air volume, the unit is mmHg/S, the dotted line is the W-P relation corresponding to the first experimental air volume, and the solid line is the W-P relation corresponding to the second experimental air volume; fig. 5 shows that different air volumes are respectively inflated under the same multiple set duty ratios, the obtained W-P relationships are not completely consistent, however, when the air pressure rise speed W is constant, in a group of W-P curves corresponding to the same experimental air volume, the interval between two adjacent W-P curves is consistent, or when the air pressure rise speed W is constant, the proportional relationship between the duty ratio change and the corresponding air pressure change is constant, it can be seen that, for air volumes (different experimental air volumes, the same cuff) with different air volumes, the first coefficient a in the duty ratio-air pressure relationship model D ═ a × P + D is constant, and the second coefficient D is correspondingly changed along with the different volumes.
In an embodiment, the PWM circuit duty ratio adjusting method may further include:
selecting n moments with equal intervals in a set time period;
respectively obtaining the air pressure P [ j ] in the cuff at each moment; wherein j is an integer which is more than or equal to 1 and less than or equal to n, and Pj is the air pressure in the sleeve at the jth moment;
according to the air pressure in the cuff at each time and the formula Delta S [ j +1]＝S0-(P[j+1]-P[j]) Calculating the air pressure rising speed deviation at the j +1 th moment; wherein, Δ S [ j +1]Is the deviation of the air pressure rising speed at the j +1 th time, Pj +1]Air pressure in the cuff at the (j + 1) th moment, S0The air pressure is a preset air pressure rising speed;
according to Δ S [ j +1]And formulasCalculating the average boosting speed deviation in a set time period; wherein,average boosting speed deviation in a set time period;
according to Δ S [ j +1]、And formulasCalculating a fine adjustment coefficient; where Δ d is a trimming coefficient, kmRepresenting a preset fine tuning proportion parameter;
updating the second coefficient to d + Δ d according to the fine tuning coefficient; and d is a second coefficient of the duty ratio-air pressure relation model before updating.
The set time period may be set to a period of time before the current time, for example, if n is 50 within 0.5 seconds before the current time during the use of the blood pressure measurement device, that is, 50 times with equal intervals are taken within 0.5 seconds before the current time, where the 1 st time is 0.5 seconds before the current time, and the n (50) th time is the current time. The preset air pressure rising speed S0The current required air pressure rising speed of the blood pressure measuring device is the real-time air pressure rising speed and S in the sleeve0In accordance with this, the difference between the two is minimized, and the measurement effect of the blood pressure measuring device can be improved. The fine tuning proportion parameter kmCan be set according to the performance characteristics of the corresponding blood pressure measuring device, such as 0.00004, etc., according to kmThe determined fine tuning coefficient deltad is associated with the performance characteristics of the respective blood pressure measuring device, further ensuring the plausibility of the determined fine tuning coefficient deltad.
According to the embodiment, the fine adjustment coefficients are determined according to the air pressure in the cuff and the corresponding air pressure rising speed at multiple moments in the use process of the blood pressure measuring device, so that the accuracy of the determined fine adjustment coefficients is improved, and further, the accuracy of the corresponding duty ratio-air pressure relation model is improved.
Because the air volume of the cuff in the blood pressure measuring device is dynamic, the duty ratio-air pressure relation model D is updated by the fine adjustment coefficient to be the second coefficient of a multiplied by P + D, the updated second coefficient is D + delta D, the updated duty ratio-air pressure relation model is D multiplied by P + D + delta D, the delta D is determined according to the difference between the preset air pressure rising speed and the real-time air pressure rising speed in the cuff, the difference between the air pressure rising speed achieved by the duty ratio adjusted by the duty ratio-air pressure relation model and the preset air pressure rising speed can be reduced as much as possible, and the accuracy of the duty ratio obtained according to the duty ratio-air pressure relation model is further ensured.
In one embodiment, after acquiring the real-time air pressure in the cuff, the method may further include:
and filtering the high-frequency signals in the real-time air pressure by a low-pass filter.
The embodiment can filter high-frequency signals in real-time air pressure, reduce the influence of noise signals such as the high-frequency signals on the duty ratio acquisition process, and further improve the accuracy of the acquired duty ratio.
As an embodiment, the low pass filter may include:
Pout[m]＝b1×Pin[m]+b2×Pin[m-1]+b3×Pin[m-2]-b4×Pout[m-1]-b5×Pout[m-2]；
wherein, Pin[m]Input air pressure, P, at the present moment of the low-pass filterout[m]Is the output air pressure, P, of the low-pass filter at the current momentin[m-1]Is the input air pressure of the low-pass filter at the first moment, Pout[m-1]Is the output air pressure of the low-pass filter at the first time, Pin[m-2]Input air pressure, P, of the low-pass filter at the second momentout[m-2]Is the output air pressure of the low-pass filter at the second moment, b1、b2、b3、b4And b5The filter coefficients are respectively, the first time is a time before the current time, and the second time is a time before the first time. In the process of filtering the real-time air pressure through the low-pass filter, the present embodiment may detect the input air pressure of the low-pass filter at a set detection frequency, record the output air pressure of the low-pass filter when detecting the input air pressure, and store the detected input air pressure, the detection time, and the recorded output air pressure for adjusting the corresponding low-pass filter, thereby improving the filtering performance of the low-pass filter. The first time is a detection time before the current time, and the second time is a detection time before the first time, that isThe second detection time before the current time. The detection frequency can be set according to the filtering accuracy of the low-pass filter.
The filter parameters of the low-pass filter may include: the sampling rate is 100Hz (Hertz), the passband cut-off frequency is 0.2Hz, the stopband cut-off frequency is 0.9Hz, the maximum attenuation of passband ripple is 5dB (decibel), and the stopband attenuation is 10 dB. The filter coefficient b1、b2、b3、b4And b5The values of (a) may be:
b1＝b3＝2.413590490419615e-04，
b2＝4.827180980839230e-04，
b4＝-1.955578240315036，
b5＝0.956543676511203。
fig. 5 shows a comparison graph of pressure curves before and after filtering the real-time pressure by using the low-pass filter, where in fig. 5, the abscissa represents time in the unit of S and the ordinate represents others in the unit of mmHg, in fig. 5, the upper irregular curve is the real-time pressure before filtering, and the lower smoother curve is the real-time pressure after filtering, and fig. 5 shows that after filtering the real-time pressure by using the low-pass filter, noise signals such as high-frequency signals in the real-time pressure can be effectively removed.
In an embodiment, the step of calculating the duty ratio of the PWM circuit in the blood pressure measuring device according to the real-time air pressure and the duty ratio-air pressure relationship model may further include:
detecting whether the duty cycle is in a duty cycle interval [ D ]min，Dmax]Internal; wherein D isminIs the lower limit of the duty cycle of the PWM circuit, DmaxThe duty ratio upper limit value of the PWM circuit;
if the duty ratio exceeds DmaxThen set the duty cycle to Dmax；
If the duty ratio is less than DminThen set the duty cycle to Dmin。
The duty ratio of the PWM circuit during normal operation generally has a certain effective duty ratio range, and the effective duty ratio range may include a lower limit value D of the duty ratiominTo the upper limit value D of the duty ratiomaxInterval of duty ratio between if the PWM circuit is in [ D ]min，Dmax]The duty cycle operation outside this interval may affect the normal operation of the PWM circuit, thereby affecting the measurement effect of the blood pressure measuring device, and the duty cycle of the PWM circuit needs to be adjusted within the corresponding effective duty cycle range to ensure the safety of the operation. Above-mentioned [ D ]min，Dmax]Represents DminAnd DmaxThe closed interval in between. The lower limit value D of the duty ratiominAnd duty ratio upper limit value DmaxThe devices may be arranged according to the performance of the respective PWM circuit, e.g. D may be arrangedminSet to 16%, DmaxSet to 50%, etc.
As an embodiment, the step of calculating the duty ratio of the PWM circuit in the blood pressure measuring device according to the real-time air pressure and the duty ratio-air pressure relation model may further include:
acquiring the duty ratio of a PWM circuit at a first moment; the first moment is a moment before the current moment;
according to the formulaUpdating the duty ratio of the current moment; wherein, D [ m ]]Is the updated duty cycle at the present time,duty ratio output for the current time duty ratio-air pressure relation model, Dm-1]Is the duty cycle at the first time;
and determining the working duty ratio of the PWM circuit according to the updated duty ratio.
The embodiment can update the duty ratio of the corresponding PWM circuit according to the duty ratio of the previous moment of the current moment, so that the duty ratio adjustment can be correspondingly adjusted according to the working state of the previous moment of the PWM circuit, and the reasonability of the determined duty ratio is further ensured.
In one embodiment, the duty ratio of the PWM circuit of the blood pressure measuring device in use is adjusted by the PWM circuit duty ratio adjusting method of the blood pressure measuring device, and data such as air pressure, air pressure rising speed, inflation time and the like in a cuff during the working process of the blood pressure measuring device are obtained and analyzed, so as to obtain a working data analysis diagram as shown in fig. 6, where fig. 6 includes 4 data analysis subgraphs, and the 4 data analysis subgraphs are arranged in fig. 6 in two rows and two columns, where a first data analysis subgraph (the 1 st row and the 1 st row) is a raw data comparison graph, the abscissa of the graph represents inflation time of the cuff, the unit is S, the ordinate represents cuff internal air pressure, the unit is mmHg, the first data analysis subgraph includes two air pressure curves, namely a raw air pressure curve measured from the cuff and a filtered air pressure curve filtered by a low-pass filter, the first data analysis subgraph can show that the two air pressure curves before and after filtering are superposed, and the low-pass filter can strictly keep the consistency of air pressure data after correspondingly filtering real-time air pressure. The second data analysis subgraph (the 1 st row and the 2 nd row) is a relationship graph of the air pressure rising speed and time, the abscissa of the graph represents the inflating time of the cuff, the unit is S, the ordinate represents the air pressure rising speed in the cuff, and the unit is mmHg/S, and the second data analysis subgraph shows that in practical application, the corresponding duty ratio can be adjusted by adopting the PWM circuit duty ratio adjusting method, so that the air pressure rising speed in the cuff can reach the set target rising speed in a short time, and the target rising speed is kept, and the measuring effect of the corresponding blood pressure measuring device can be improved. The third data analysis subgraph (line 2, line 1) is an air pressure rising speed-air pressure relation graph, the abscissa of the graph represents the air pressure in the cuff, the unit is mmHg, the ordinate represents the rising speed of the air pressure in the cuff, the unit is mmHg/S, the straight line with the air pressure rising speed W equal to 5 is the air pressure rising speed required to be kept in the cuff, the curve in the graph represents the actual rising speed in the cuff, and the third data analysis subgraph can show that the duty ratio control is carried out through the duty ratio-air pressure relation model D equal to a multiplied by P + D + delta D, the target rising speed required to be kept in the cuff can be reached when the air pressure in the cuff is small (namely in short inflation time), and relevant measurement can be carried out by keeping the corresponding target rising speed. The fourth data analysis subgraph (line 2, 2) is a duty ratio-time relation graph, the abscissa of the graph represents the duty ratio, the unit is 1/1000, the ordinate represents the inflation time of the cuff, the unit is S, and the fourth data analysis subgraph shows that when the PWM circuit starts to work, the corresponding cuff can be rapidly inflated with a slightly smaller duty ratio, and after the cuff is inflated to the corresponding blood pressure measuring device and blood pressure measurement can be started, the duty ratio can be increased at a more stable speed so as to ensure the working stability of the corresponding PWM circuit.
Referring to fig. 7, fig. 7 is a schematic structural diagram of a PWM circuit duty cycle adjusting system of a blood pressure measuring device according to an embodiment, including:
the first acquisition module 10 is used for acquiring real-time air pressure in the cuff when the blood pressure measuring device works;
the second obtaining module 20 is configured to calculate a duty ratio of a PWM circuit in the blood pressure measuring apparatus according to the real-time air pressure and the duty ratio-air pressure relationship model; wherein the duty ratio-air pressure relation model represents a functional relation between the duty ratio and the air pressure when the rising speed of the air pressure in the cuff is constant;
and the determining module 30 is configured to adjust the duty cycle of the PWM circuit according to the duty cycle.
The technical characteristics and the beneficial effects described in the embodiment of the PWM circuit duty ratio adjusting method of the blood pressure measuring device are applicable to the embodiment of the PWM circuit duty ratio adjusting system of the blood pressure measuring device, and the technical characteristics and the beneficial effects are stated in the specification.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (11)

1. A duty ratio adjusting method of a PWM circuit of a blood pressure measuring device is characterized by comprising the following steps:
when the blood pressure measuring device works, acquiring real-time air pressure in the cuff;
calculating the duty ratio of a PWM circuit in the blood pressure measuring device according to the real-time air pressure and the duty ratio-air pressure relation model; wherein the duty ratio-air pressure relation model represents a functional relation between the duty ratio and the air pressure when the rising speed of the air pressure in the cuff is constant;
and adjusting the working duty ratio of the PWM circuit according to the duty ratio.
2. The PWM circuit duty ratio adjustment method of a blood pressure measurement device according to claim 1, further comprising:
controlling the PWM circuit to respectively inflate the experimental gas capacity under the conditions of a plurality of set duty ratios;
respectively acquiring a function relation between the rising speed and the air pressure in the experimental air volume in the process of inflating the experimental air volume for each time to obtain a rising speed-air pressure relation model;
and obtaining the relationship between the duty ratio and the air pressure when the air pressure in the experimental air volume is constant from the rising speed-air pressure relationship model to obtain the duty ratio-air pressure relationship model.
3. The PWM circuit duty cycle adjustment method of a blood pressure measurement device according to claim 2, wherein the duty cycle-air pressure relationship model includes D ═ a × P + D; wherein P is the air pressure in the cuff, D is the duty ratio of the PWM circuit, a is a first coefficient of the duty ratio-air pressure relation model, and D is a second coefficient of the duty ratio-air pressure relation model.
4. The PWM circuit duty ratio adjustment method of a blood pressure measurement device according to claim 3, further comprising:
when the rising speed of the air pressure in the experimental air volume is constant, a plurality of groups (P) corresponding to the ith experimental air volume are obtainedi，Di) According to a plurality of groups (P)i，Di) Determining D corresponding to ith experimental gas capacityi＝a×PiFirst coefficient a in + diAnd a second coefficient di(ii) a Wherein D isiRepresents the duty ratio, P, of the PWM circuit corresponding to the ith experimental gas capacityiRepresents a duty ratio of the PWM circuit as DiThen, the air pressure in the corresponding experimental air volume;
according to each aiAnd diAnd determining the a and the d.
5. The PWM circuit duty ratio adjustment method of a blood pressure measurement device according to claim 4, wherein a is set according to each aiAnd diThe step of determining a and d comprises:
according to each aiAnd formulasCalculating a;
according to each diAnd formulasD is calculated; wherein i is an integer of more than or equal to 1 and less than or equal to k, and k represents the number of different experimental gas volumes.
6. The PWM circuit duty ratio adjustment method of a blood pressure measurement device according to claim 3, further comprising:
selecting n moments with equal intervals in a set time period;
respectively obtaining the air pressure P [ j ] in the cuff at each moment; wherein j is an integer which is more than or equal to 1 and less than or equal to n, and Pj is the air pressure in the sleeve at the jth moment;
according to the air pressure in the cuff at each time and the formula Delta S [ j +1]＝S0-(P[j+1]-P[j]) Calculating the air pressure rising speed deviation at the j +1 th moment; wherein, Δ S [ j +1]Is the deviation of the air pressure rising speed at the j +1 th time, Pj +1]Air pressure in the cuff at the (j + 1) th moment, S0The air pressure is a preset air pressure rising speed;
according to Δ S [ j +1]And formulasCalculating the average boosting speed deviation in a set time period; wherein,average boosting speed deviation in a set time period;
according to Δ S [ j +1]、And formulasCalculating a fine adjustment coefficient; where Δ d is a trimming coefficient, kmRepresenting a preset fine tuning proportion parameter;
and updating the second coefficient to d + delta d according to the fine tuning coefficient.
7. The method for adjusting the duty ratio of the PWM circuit of the blood pressure measuring device according to any one of claims 1 to 6, further comprising, after acquiring the real-time air pressure in the cuff:
and filtering the high-frequency signals in the real-time air pressure by a low-pass filter.
8. The PWM circuit duty ratio adjustment method of a blood pressure measurement device according to claim 7, wherein the low-pass filter includes:
Pout[m]＝b1×Pin[m]+b2×Pin[m-1]+b3×Pin[m-2]-b4×Pout[m-1]-b5×Pout[m-2]；
wherein, Pin[m]Input air pressure, P, at the present moment of the low-pass filterout[m]Is the output air pressure, P, of the low-pass filter at the current momentin[m-1]Is the input air pressure of the low-pass filter at the first moment, Pout[m-1]Is the output air pressure of the low-pass filter at the first time, Pin[m-2]Input air pressure, P, of the low-pass filter at the second momentout[m-2]Is the output air pressure of the low-pass filter at the second moment, b1、b2、b3、b4And b5The filter coefficients are respectively, the first time is a time before the current time, and the second time is a time before the first time.
9. The method for adjusting the duty ratio of the PWM circuit of the blood pressure measuring device according to any one of claims 1 to 6, wherein the step of calculating the duty ratio of the PWM circuit of the blood pressure measuring device according to the real-time air pressure and the duty ratio-air pressure relationship model further comprises:
detecting whether the duty cycle is in a duty cycle interval [ D ]min，Dmax]Internal; wherein D isminIs the lower limit of the duty cycle of the PWM circuit, DmaxThe duty ratio upper limit value of the PWM circuit;
if the duty ratio exceeds DmaxThen set the duty cycle to Dmax；
If the duty ratio is less than DminThen set the duty cycle to Dmin。
10. The method for adjusting the duty ratio of the PWM circuit of the blood pressure measuring apparatus according to claim 9, wherein the step of calculating the duty ratio of the PWM circuit of the blood pressure measuring apparatus according to the real-time air pressure and the relationship model between the duty ratio and the air pressure further comprises:
acquiring the duty ratio of a PWM circuit at a first moment; the first moment is a moment before the current moment;
according to the formulaUpdating the duty ratio of the current moment; wherein, D [ m ]]Is the updated duty cycle at the present time,duty ratio output for the current time duty ratio-air pressure relation model, Dm-1]Is the duty cycle at the first time;
and determining the working duty ratio of the PWM circuit according to the updated duty ratio.
11. A PWM circuit duty cycle adjustment system of a blood pressure measurement device, comprising:
the first acquisition module is used for acquiring real-time air pressure in the cuff when the blood pressure measuring device works;
the second acquisition module is used for calculating the duty ratio of a PWM circuit in the blood pressure measuring device according to the real-time air pressure and the duty ratio-air pressure relation model; wherein the duty ratio-air pressure relation model represents a functional relation between the duty ratio and the air pressure when the rising speed of the air pressure in the cuff is constant;
and the determining module is used for adjusting the working duty ratio of the PWM circuit according to the duty ratio.
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