CN215017462U - SOC integrated circuit based on cardiac shock signal detection - Google Patents

Abstract

The utility model discloses a SOC integrated circuit based on heart impact signal detects belongs to integrated circuit technical field. This SOC integrated circuit sets up on the shoe pad, includes: the system comprises a heart impact signal acquisition module, an SOC integrated circuit module and a singlechip module; the heart impact signal acquisition module is arranged on the shoe pad, and the heart impact signal acquisition module, the SOC integrated circuit module and the single chip microcomputer module are sequentially connected; the SOC integrated circuit module includes: the device comprises a charge amplifier, a voltage follower, a voltage comparator, a band-pass filter and an analog-to-digital converter. The utility model discloses a SOC integrated circuit is through collecting BCG signal acquisition, voltage amplification, voltage follow, voltage lifting, voltage comparison, filtering and analog-to-digital conversion process in an organic whole, reduces original board level circuit's volume and quality effectively, the utility model discloses a SOC integrated circuit sets up the non-contact measurement that can realize the BCG signal on the shoe-pad.

Description

SOC integrated circuit based on cardiac shock signal detection

Technical Field

The utility model relates to a wearable technical field specifically, relates to a SOC integrated circuit based on heart impact signal detects.

Background

Cardiovascular diseases are always the first cause of death of human beings, but the most common cardiac detection method at present is carried out by using ECG signals, but the detection of the ECG signals needs to be carried out by coating a couplant on a human body in advance and then attaching electrodes, so that the method is a contact type detection method which is easy to bring discomfort to a tester, thereby causing psychological stress and influencing the detection accuracy. Therefore, a non-contact detection method is needed to solve this problem.

The Ballistocardiogram (BCG) signal is a weak vibration signal generated on the surface of a human body, contains abundant cardiovascular information of the human body, can be used for carrying out BCG signal acquisition in a non-contact mode, cannot generate larger psychological pressure on a tester, and has more accurate detection result. However, BCG signals are weak, and the acquisition device is large in size, which is not beneficial to real-time monitoring of cardiovascular diseases, so BCG signal detection in the traditional cardiovascular disease detection is very rare.

SUMMERY OF THE UTILITY MODEL

To the problem that exists among the prior art, the utility model provides a SOC integrated circuit based on heart impact signal detects. The SOC integrated circuit enables detection based on BCG signals, and is integrated in the wearable insole, so that intellectualization of the insole and non-contact measurement of the BCG signals are achieved.

In order to achieve the above purpose, the utility model adopts the following technical scheme: an SOC integrated circuit based on ballistocardiogram signal detection, the SOC integrated circuit disposed on a shoe pad, comprising: the system comprises a heart impact signal acquisition module, an SOC integrated circuit module and a singlechip module; the heart impact signal acquisition module is arranged on the shoe pad, and the heart impact signal acquisition module, the SOC integrated circuit module and the single chip microcomputer module are sequentially connected; the SOC integrated circuit module includes: the charge amplifier, the voltage follower, the voltage comparator, the band-pass filter and the analog-to-digital converter; the heart attack signal acquisition module is connected with the charge amplifier, the charge amplifier is connected with the voltage follower and the voltage comparator respectively, the voltage follower is connected with the voltage comparator, the voltage comparator is connected with the band-pass filter and the analog-to-digital converter in sequence, and the analog-to-digital converter is connected with the single chip microcomputer module.

Furthermore, the cardiac shock signal acquisition module is a PVDF piezoelectric film.

Further, the thickness of the heart impact signal acquisition module is 0.5 mm-1 mm.

Furthermore, the charge amplifier comprises a first capacitor C1, a first resistor R1 and a first operational amplifier which are connected in parallel, one lead of the ballistocardiogram signal acquisition module is connected with the same-direction input end of the first operational amplifier, the other lead of the ballistocardiogram signal acquisition module is connected with the reverse-direction input end of the first operational amplifier, the same-direction input end of the first operational amplifier is further connected with a voltage follower, and the output end of the first operational amplifier is connected with a voltage comparator.

Further, the voltage follower is composed of a power supply voltage division circuit composed of a second resistor R2 and a third resistor R3, and a second operational amplifier, wherein the power supply voltage division circuit is connected with the same-direction input end of the second operational amplifier, the output end of the second operational amplifier is connected with the same-direction input end of the first operational amplifier, and the reverse input end of the second operational amplifier is connected with the same-direction input end of the first operational amplifier.

Further, the voltage comparator includes: a third operational amplifier, a second capacitor C2, a third capacitor C3, a fourth resistor R4, a fifth resistor R5; the second capacitor C2 and the third capacitor C3 are connected in series with one end of a fourth resistor R4 after being connected in parallel, the other end of the fourth resistor R4 is connected with one end of a fifth resistor R5 and the reverse input end of a third operational amplifier respectively, the other end of the fifth resistor R5 is connected with the output end of the third operational amplifier, the output end of the third operational amplifier is connected with a band-pass filter, and the same-direction input end of the third operational amplifier is connected with a charge amplifier.

Furthermore, the cathodes of the second capacitor C2 and the third capacitor C3 are connected in parallel with the power supply voltage dividing circuit, and the anodes of the second capacitor C2 and the third capacitor C3 are connected to the output end of the second operational amplifier and the same-direction input end of the first operational amplifier, respectively.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses a BCG signal that SOC integrated circuit will gather is handled the back through SOC integrated circuit module, sends single chip module to, and single chip module judges out people's heart health status according to the BCG signal, carries out reasonable early warning. The utility model provides a SOC integrated circuit is integrated in an organic whole with heart impact signal acquisition module, charge amplifier, voltage follower, voltage comparator, band pass filter, analog to digital converter and singlechip, has reduced BCG signal detection device's volume and quality greatly, can enlarge, filter weak BCG signal simultaneously, improves measurement accuracy. The utility model discloses to set up the SOC integrated circuit based on BCG signal detection on the shoe-pad, realize the non-contact measurement of BCG signal, this SOC integrated circuit has convenient and practical, low cost's characteristics, has wide prospect in cardiovascular disease's detection.

Drawings

Fig. 1 is a schematic structural diagram of an SOC integrated circuit based on ballistocardiogram signal detection according to the present invention;

fig. 2 is a circuit diagram of the SOC integrated circuit module of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings.

Referring to fig. 1, it is a schematic structural diagram of the SOC integrated circuit based on the cardiac shock signal detection of the present invention; this SOC integrated circuit sets up on the shoe pad, includes: the system comprises a heart impact signal acquisition module, an SOC integrated circuit module and a singlechip module; the central impact signal acquisition module is arranged on the shoe pad, and the central impact signal acquisition module, the SOC integrated circuit module and the single chip microcomputer module are sequentially connected; the utility model discloses well adopted heart impact signal acquisition module is PVDF piezoelectric film, cuts out PVDF piezoelectric film into the shoe-pad form to glue and glue in the shoe-pad below, utilize PVDF piezoelectric film to have the characteristic of high sensitivity to dynamic stress to gather the BCG signal that the tester stands under the quiescent condition, draw forth the electrode at PVDF piezoelectric film both ends through the surface about the conductive adhesive bonding electrode, be connected with SOC integrated circuit module, give SOC integrated circuit module with the BCG signal transmission who gathers. Because the thickness of shoe-pad generally is 2~3mm, for avoiding the tester to produce uncomfortable sense, the utility model discloses in set up PVDF piezoelectric film thickness into 0.5~1 mm. The utility model provides a BCG signal that SOC integrated circuit will gather through PVDF piezoelectric film carries out after charge amplification, voltage follow, voltage lifting, voltage comparison, filtering, carries out analog-to-digital conversion, sends single chip module at last, and single chip module judges people's heart health status to and the early warning. Therefore, the utility model provides a SOC integrated circuit module includes: the charge amplifier, the voltage follower, the voltage comparator, the band-pass filter and the analog-to-digital converter; the heart attack signal acquisition module is connected with the charge amplifier, the charge amplifier is respectively connected with the voltage follower and the voltage comparator, the voltage follower is connected with the voltage comparator, the voltage comparator is sequentially connected with the band-pass filter BF and the analog-to-digital converter, and the analog-to-digital converter is connected with the single chip microcomputer module.

Referring to fig. 2, for the utility model discloses SOC integrated circuit's circuit diagram, charge amplifier converts the weak charge signal of heart impact signal collection module collection into voltage signal, charge amplifier includes 200 pF's parallelly connected first condenser C1, 100M omega's first resistance R1 and first operational amplifier, a lead wire of heart impact signal collection module is connected with first operational amplifier's syntropy input, another lead wire is connected with first operational amplifier's reverse input, first operational amplifier's syntropy input is connected with the voltage follower, first operational amplifier's output and voltage comparator are connected. The voltage follower comprises a power supply voltage division circuit and a second operational amplifier, wherein the power supply voltage division circuit consists of a second resistor R2 of 10K omega and a third resistor R3 of 10K omega, divides the power supply voltage VCC, and inputs half of the power supply voltage to the same-direction input end of the second operational amplifier, and the output end of the second operational amplifier is connected with the same-direction input end of the first operational amplifier to form a voltage lifting circuit, wherein the lifting voltage is 1.65V, so that the output voltage meets the voltage conversion range of the analog-to-digital converter (ADC); the inverting input terminal of the second operational amplifier is connected to the non-inverting input terminal of the first operational amplifier. The voltage comparator includes: a third operational amplifier, a second capacitor C2 of 68 μ F, a third capacitor C3 of 0.1 μ F, a fourth resistor R4 of 10K Ω, a fifth resistor R5 of 10K Ω; the second capacitor C2 and the third capacitor C3 are connected in parallel and then connected in series with one end of a fourth resistor R4, the other end of the fourth resistor R4 is respectively connected with one end of a fifth resistor R5 and the reverse input end of a third operational amplifier, the other end of the fifth resistor R5 is connected with the output end of the third operational amplifier, the output end of the third operational amplifier is connected with a band-pass filter BF, and the same-direction input end of the third operational amplifier is connected with a charge amplifier; the cathodes of the second capacitor C2 and the third capacitor C3 are connected in parallel with the power supply voltage dividing circuit, and the anodes of the second capacitor C2 and the third capacitor C3 are connected to the output terminal of the second operational amplifier and the unidirectional input terminal of the first operational amplifier, respectively. The voltage comparator is used for shaping and amplifying the lifted and superposed mixed non-sinusoidal signals into rectangular wave waveforms with different duty ratios, and finally outputting the rectangular wave waveforms through the output end. The voltage comparator adopts a mode of superposing the power frequency signal and the BCG, when no BCG signal exists, a square wave signal with the duty ratio of about 50% is output, and when the BCG signal is carried in the power frequency signal, a square wave signal (more than 50%) with the variable duty ratio is output. The same-direction input ends of the first operational amplifier and the third operational amplifier are connected with a power supply voltage VCC, and the output ends of the first operational amplifier, the second operational amplifier and the third operational amplifier are grounded.

Because probably there are interference signal such as noise in the rectangular wave signal of output through voltage comparator output, carry out filtering process to it through band pass filter BF, make the testing result more accurate, the utility model discloses the band pass filter BF that well adopted is put for using the ideal fortune band pass filter (supply voltage is VCC), realizes band pass filter BF's function. Will be provided withThrough in filtering processing's BCG signal transmission to analog-to-digital converter, the utility model discloses well analog-to-digital converter who adopts is successive approximation type ADC, and supply voltage is the VCC to insert a reference voltage V_REFThe converter performs analog-to-digital conversion on the filtered BCG signal, converts the analog signal into a discrete digital signal, and converts the digital signal V into a digital signal_outAnd transmitting the BCG signal to a singlechip module, judging whether the BCG signal is abnormal or not through the singlechip module, and early warning the abnormal BCG signal.

The utility model discloses a SOC integrated circuit is integrated in an organic whole with BCG signal acquisition, voltage amplification, voltage follow, voltage lifting, voltage comparison, filtering and analog-to-digital conversion process, has reduced BCG signal processing module's volume and quality greatly for this SOC integrated circuit can extensively be arranged in wearable device, if be applicable the utility model discloses an in the shoe-pad, realize the non-contact measurement to the BCG signal.

Above only the utility model discloses an it is preferred embodiment, the utility model discloses a scope of protection not only limits in above-mentioned embodiment, and the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, a plurality of modifications and decorations without departing from the principle of the present invention should be considered as the protection scope of the present invention.

Claims (7)

1. An SOC integrated circuit based on ballistocardiogram signal detection, the SOC integrated circuit disposed on a shoe pad, comprising: the system comprises a heart impact signal acquisition module, an SOC integrated circuit module and a singlechip module; the heart impact signal acquisition module is arranged on the shoe pad, and the heart impact signal acquisition module, the SOC integrated circuit module and the single chip microcomputer module are sequentially connected; the SOC integrated circuit module includes: the charge amplifier, the voltage follower, the voltage comparator, the band-pass filter and the analog-to-digital converter; the heart attack signal acquisition module is connected with the charge amplifier, the charge amplifier is connected with the voltage follower and the voltage comparator respectively, the voltage follower is connected with the voltage comparator, the voltage comparator is connected with the band-pass filter and the analog-to-digital converter in sequence, and the analog-to-digital converter is connected with the single chip microcomputer module.

2. The SOC integrated circuit based on ballistocardiogram signal detection as claimed in claim 1, wherein the ballistocardiogram signal acquisition module is a PVDF piezoelectric film.

3. The SOC integrated circuit based on cardioverter shock signal detection as claimed in claim 1, wherein the thickness of the cardioverter shock signal acquisition module is 0.5-1 mm.

4. The SOC integrated circuit based on impact signal detection as claimed in claim 1, wherein the charge amplifier comprises a first capacitor C1, a first resistor R1 and a first operational amplifier connected in parallel, one lead of the impact signal collection module is connected with a unidirectional input terminal of the first operational amplifier, the other lead is connected with an inverted input terminal of the first operational amplifier, the unidirectional input terminal of the first operational amplifier is further connected with a voltage follower, and an output terminal of the first operational amplifier is connected with a voltage comparator.

5. The SOC integrated circuit of claim 1, wherein the voltage follower comprises a power divider circuit comprising a second resistor R2 and a third resistor R3, and a second operational amplifier, the power divider circuit is connected to a non-inverting input of the second operational amplifier, the output of the second operational amplifier is connected to a non-inverting input of the first operational amplifier, and the inverting input of the second operational amplifier is connected to a non-inverting input of the first operational amplifier.

6. The SOC integrated circuit of claim 1, wherein the voltage comparator comprises: a third operational amplifier, a second capacitor C2, a third capacitor C3, a fourth resistor R4, a fifth resistor R5; the second capacitor C2 and the third capacitor C3 are connected in series with one end of a fourth resistor R4 after being connected in parallel, the other end of the fourth resistor R4 is connected with one end of a fifth resistor R5 and the reverse input end of a third operational amplifier respectively, the other end of the fifth resistor R5 is connected with the output end of the third operational amplifier, the output end of the third operational amplifier is connected with a band-pass filter, and the same-direction input end of the third operational amplifier is connected with a charge amplifier.

7. The SOC integrated circuit as claimed in claim 6, wherein cathodes of the second and third capacitors C2 and C3 are connected in parallel with the power supply voltage divider circuit to ground, and anodes of the second and third capacitors C2 and C3 are connected to the output terminal of the second operational amplifier and the same-direction input terminal of the first operational amplifier, respectively.

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