CN209826722U - Surface electromyogram signal acquisition device - Google Patents
Surface electromyogram signal acquisition device Download PDFInfo
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- CN209826722U CN209826722U CN201822140183.3U CN201822140183U CN209826722U CN 209826722 U CN209826722 U CN 209826722U CN 201822140183 U CN201822140183 U CN 201822140183U CN 209826722 U CN209826722 U CN 209826722U
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Abstract
The utility model discloses a surface flesh electric signal collection system, including being used for picking up the modulate circuit of unit connection with the biological electricity signal, modulate circuit includes amplifier circuit, its characterized in that, amplifier circuit have connected gradually analog-to-digital converter, digital isolator, the singlechip that has the AD sampling function, and the singlechip carries out the information interaction with the host computer.
Description
Technical Field
The utility model relates to a signal acquisition technical field, concretely relates to surface electromyogram signal acquisition device.
Background
Electromyographic signals (EMG) are a complex result of the integration of sub-epidermal electromyographic activity at the skin surface both temporally and spatially. The electromyographic signals are derived from the own electric signals of people, so the electromyographic signals have the characteristics of direct and natural, are an important information quantity by utilizing the electromyographic signals, and can be used for the research on the aspects of muscle movement, muscle injury diagnosis, rehabilitation medicine, sports and the like. Generally, multi-channel EMG signals measured from the skin on the surface of the moving muscle can be used to provide a safe and non-invasive way of extracting EMG signals, and thus can be used for human locomotion and biomechanical studies.
The existing electromyographic signal acquisition device generally obtains the electromyographic signal of the skin surface by contacting the skin of a human body through an electrode, and then processes the electromyographic signal through a corresponding circuit. However, the conventional electromyographic signal acquisition device usually adopts a conventional analog device, so that the common-mode rejection ratio of the acquired electromyographic signals is low, the input impedance is low, and the accuracy is low. Meanwhile, the use of a large number of analog devices also leads to low signal-to-noise ratio of the whole amplification system, difficult miniaturization of the volume, high cost and high power consumption.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a surface electromyogram signal acquisition device can solve the problem among the above-mentioned prior art.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a surface electromyographic signal acquisition device comprises a conditioning circuit connected with a bioelectricity signal pickup unit, wherein the conditioning circuit comprises an amplifying circuit, the amplifying circuit is sequentially connected with an analog-to-digital converter with an A/D sampling function, a digital isolator and a single chip microcomputer, and the single chip microcomputer is in information interaction with an upper computer.
As a preferred mode, the conditioning circuit further comprises a transient voltage protection circuit, a lightning protection circuit and a low-pass filter; the input end of the amplifying circuit is sequentially connected with a low-pass filter, a transient voltage protection circuit and a lightning protection circuit, and the myoelectric signals enter the amplifying circuit after being processed by the lightning protection circuit, the transient voltage protection circuit and the low-pass filter.
Preferably, the amplifying circuit comprises a low-noise two-way symmetrical preamplifier as an input end, a baseline drift correction circuit, a second-stage amplifying circuit and a third-stage amplifying circuit as an output end which are connected in sequence.
As a preferred technical scheme, the conditioning circuit has two paths, which form a dual-channel for a signal to enter the analog-to-digital converter.
As a preferred technical scheme, the baseline wander correcting circuit comprises an integrating amplifier U2, the positive input end of an integrating amplifier U2 is grounded, and the negative input end of an integrating amplifier U2 is connected with the output end of a low-noise two-way symmetrical preamplifier through a resistor R11. And a capacitor C6 is also connected between the negative input end and the output end of the integrating amplifier U2, and the output end of the integrating amplifier U2 is connected to the reference pin of the low-noise two-way symmetrical preamplifier.
As a preferred technical solution, the lightning protection circuit includes a gas discharge tube, the transient voltage protection circuit includes a transient suppressor diode, one end of the gas discharge tube is connected to one pole of the transient suppressor diode, the other end of the gas discharge tube is connected to the other pole of the transient suppressor diode through a resistor, a common terminal between the resistor and the gas discharge tube is used as an input terminal of the electromyographic signal, and a common terminal between the transient suppressor diode and the resistor is used as an output terminal of the electromyographic signal.
As a preferred technical scheme, the three-stage amplifying circuit is a differential amplifying circuit and outputs a differential signal; the Vocm pin of the amplifier U4 of the three-stage amplification circuit is connected to the ground through a capacitor C5, and the common terminal between the Vocm pin and the capacitor C5 is connected with 2.5V voltage.
As a preferred technical scheme, a VCOM pin of an analog-to-digital converter is connected to a positive input end of an amplifier U5, a negative input end of an amplifier U5 is connected with an output end of an amplifier U5, and an output end of an amplifier U5 inputs 2.5V voltage through a resistor R17;
the VREFP pin of the analog-to-digital converter ADC is connected to the ground through a capacitor C11, the VREFP pin of the analog-to-digital converter ADC is further connected to the output end of an amplifier U6 through a resistor R18, the output end of an amplifier U6 is further connected to the negative input end of an amplifier U6, the positive input end of an amplifier U6 is connected to the VO pin of a chip U7, the VO pin of a chip U7 is connected to the ground through a capacitor C12, the Vin pin of a chip U7 is connected to a voltage VCC, the Vin pin of a chip U7 is connected to one end of a capacitor C14 and one end of an electrolytic capacitor Cz1, the other ends of the capacitor C14 and the electrolytic capacitor Cz1 are connected to one end of a capacitor C13 and then connected to. The chip U7 outputs a reference voltage to the analog-to-digital converter ADC.
As an optimal technical scheme, the single chip microcomputer carries out information interaction with an upper computer through a USB transmission circuit.
As a preferred technical scheme, the front end of the second-stage amplifying circuit is also connected with a low-pass filter circuit.
Compared with the prior art, the utility model, following beneficial effect has:
(1) the utility model discloses the low-power consumption that will have AD acquisition function, small size, high sampling rate, the analog-to-digital converter of high accuracy is put the isolation front end of original flesh electrical signal amplifier circuit, because convert flesh electrical signal into digital signal, no longer be analog signal but digital signal through the isolation circuit transmission, this kind of design can save original circuit in the price, the consumption, the amplifier device is kept apart in the biggest simulation of volume, and the substitute is the low price, small, the digital isolator of low power consumption, cost and consumption have been reduced under the condition that does not reduce original security and SNR, make entire system miniaturization more easily.
(2) Because the system carries out data processing to digital signal based on the singlechip, does not use any traditional analogue device to handle, so this utility model discloses can save analogue trapper among the prior art and analogue devices such as simulation band pass filter, because analogue device external factors such as along with time and temperature can produce the performance decay, consequently the utility model discloses greatly reduced printed circuit board's volume and the consumption of system, broken away from traditional analogue device and have voltage drift, temperature drift and noise, the poor performance scheduling problem. The performance of the prior large instrument can be realized in a smaller volume.
(3) Due to the reduction of the power consumption of elements and the number of active components, the whole power consumption of the system is low, the system has the condition of working for a long time under the condition of battery power supply, and meanwhile, the size is small, the portability of the system is realized, and the wearable device has the advantage of being wearable.
(4) A standard USB output interface is provided to facilitate communication with other medical instruments or consumer electronic devices and to prevent unnecessary reduction in signal-to-noise ratio due to long-range transmission of analog signals.
Drawings
Fig. 1 is a structural frame diagram of the present invention.
Fig. 2 is a schematic circuit diagram of the middle lightning protection circuit and the transient voltage protection circuit of the present invention.
Fig. 3 is a schematic circuit diagram of the low-pass filter of the present invention.
Fig. 4 is a schematic circuit diagram of the low-noise dual-path symmetrical preamplifier, the baseline drift correction circuit, the second-stage amplifying circuit and the third-stage amplifying circuit of the present invention.
Fig. 5 is a circuit schematic of an analog-to-digital converter.
FIG. 6 is a circuit schematic of the digital isolator.
Fig. 7 is a schematic circuit diagram of the single chip microcomputer.
FIG. 8 is a schematic circuit diagram of a USB transmission circuit.
Detailed Description
An object of the utility model is to overcome prior art's defect, provide a surface electromyogram signal acquisition device, it is right to combine the embodiment below the utility model discloses do further detailed description.
Examples
A surface electromyographic signal acquisition device comprises an analog-to-digital converter and two conditioning circuits connected with the analog-to-digital converter, wherein the two conditioning circuits are respectively used as two channels to input electromyographic signals to the analog-to-digital converter. The analog-to-digital converter is sequentially connected with a digital isolator, a singlechip arithmetic circuit and a USB transmission circuit, the acquisition device is connected with an upper computer through the USB transmission circuit to realize information interaction, and the upper computer is a computer in the embodiment.
Each conditioning circuit comprises a lightning protection circuit, a transient voltage protection circuit, a low-pass filter, a low-noise two-way symmetrical preamplifier, a baseline drift correction circuit, a second-stage amplification circuit and a third-stage amplification circuit which are sequentially connected. The input end of the lightning protection circuit which is a conditioning circuit is used for receiving the electromyographic signals, and the output end of the third-stage amplifying circuit which is the conditioning circuit is connected with the analog-to-digital converter.
The physical quantity measured by the acquisition device is the physical quantity of the myoelectric voltage of the surface of the human body. The electrode plate sends the human body surface electromyogram signals including a positive electrode, a reference electrode and a negative electrode into a low-noise two-way symmetrical preamplifier through a lead wire and a signal connector after being sent into a lightning protection circuit, a transient voltage protection circuit and a low-pass filter, so as to ensure excellent common mode rejection ratio, the signals are subjected to baseline drift correction after being output by the amplifier, low-frequency components in the collected signals are removed, the signals are subjected to second-stage amplification and then sent into a third-stage amplification and then superposed with reference direct current voltage for level lifting, finally the conditioned signals are obtained, the conditioned signals are input into an analog-to-digital converter, and the analog-to-digital converter outputs digital signals to the input end of a digital isolator.
The single chip microcomputer initializes an input/output interface (I/O port), a serial port baud rate and a USB input/output interface, a sampling interval of an analog-to-digital converter is set to be 0.1mS (the sampling rate is 10 kHz), the analog-to-digital converter performs analog-to-digital conversion on the conditioned signals, the two-channel electromyographic signals are converted into digital signals, the analog-to-digital converter generates an interrupt signal when the conversion is completed, and the signal informs the single chip microcomputer that an AD value can be read. The single chip microcomputer reads the AD value into a buffer area according to a channel, then immediately reads out the data of the buffer area, and respectively and sequentially puts the multi-sampling results into a band-pass filter and a power frequency trap filter for digital filtering processing; and finally, the processed data is put into a USB buffer area, and the digital signals filtered in the buffer area are sent to a computer from a USB interface of the singlechip in a digital form.
The following describes a specific circuit configuration adopted by the above circuit.
The lightning protection circuit comprises a GAS discharge tube GAS, the transient voltage protection circuit comprises a transient suppression diode TVS, one end of the GAS discharge tube GAS is connected with one pole of the transient suppression diode TVS, the other end of the GAS discharge tube GAS is connected with the other pole of the transient suppression diode TVS through a resistor RES, a public end between the resistor RES and the GAS discharge tube GAS is used as an input end of an electromyographic signal, and a public end between the transient suppression diode TVS and the resistor RES is used as an output end of the electromyographic signal. In this embodiment, the lightning protection circuit and the transient voltage protection circuit discharge static electricity quickly, the transient voltage protection circuit guides energy to the ground after being turned on, and then the lightning protection circuit absorbs the energy quickly.
The low-pass filter is a traditional circuit and comprises resistors R14, R15 and R16 which are connected in series, wherein the resistor R14 is used as an input end and connected with the output end, and the resistor R16 is used as an output end and connected with the low-noise two-way symmetrical preamplifier. Two ends of the resistor R16 are respectively connected with one ends of the capacitor C9 and the capacitor 10, a common end between the resistor R14 and the resistor R15 is connected with one end of the capacitor C8, and the other ends of the capacitors C8, C9 and C10 are grounded.
The low-noise two-way symmetrical preamplifier comprises an amplifier U1, wherein a pin 1 of an amplifier U1 is connected with the output end of a low-pass filter through a resistor R4 to serve as a signal input channel, and a pin 4 of an amplifier U1 is connected with the output end of the low-pass filter through a resistor R12; connected as another signal input channel; resistors RG1 and RG2 are connected in series between pins 2 and 3 of the amplifier U1. Pin 8 of amplifier U1 is the voltage VCC connection, and pin 5 of amplifier U1 is connected to common ground VSS. The resistor RG1 and the resistor RG2 are used for adjusting the gain and the amplification factor.
The baseline wander correction circuit includes an integrating amplifier U2, the positive input terminal of the integrating amplifier U2 is grounded, and the negative input terminal of the integrating amplifier U2 is connected to the 7-pin (output terminal) of the amplifier U1 through a resistor R11. A capacitor C6 is also connected between the negative input terminal and the output terminal of the integrating amplifier U2, and the output terminal of the integrating amplifier U2 is connected to pin 6 (reference voltage input terminal) of the amplifier U1. The output signal of the amplifier U1 passes through an integrating amplifier U2 and then through pin 6 (reference pin) of the amplifier U1 to correct the baseline.
The two-stage amplifying circuit comprises an operational amplifier U3, wherein the positive input end of the operational amplifier U3 is connected to the common end between a resistor R11 and an amplifier U1 through resistors R8 and R7 in sequence. The common terminal between the resistors R7, R8 is connected to the output terminal of the operational amplifier U3 through the capacitor C3. The common terminal between the resistor R8 and the positive input terminal of the operational amplifier U3 is grounded through a capacitor C4. The common end between one ends of the series resistors R2 and R3 is connected to the negative input end of the operational amplifier U3, the other end of the resistor R2 is grounded, and the other end of the resistor R3 is connected to the output end of the operational amplifier U3. The signal from the baseline drift correction circuit is processed by low-pass filtering formed by the resistor R8 and the capacitor C4, and because certain high-frequency interference still exists after the signal is released, the high-frequency interference is removed by the low-pass filtering again before the signal is amplified in the second stage, so that the signal is more accurate. The three-stage amplifying circuit comprises an amplifier U4, is a differential amplifying circuit and outputs differential signals. And a differential circuit is adopted to suppress the common-mode signal, so that the electromyographic signal has stronger anti-interference capability. The Vin-leg of the amplifier U4 is connected to the output of the operational amplifier U3 through a resistor R9. The common end between the Vin-pin of the amplifier U4 and the resistor R9 is connected with one end of a capacitor C7 and one end of a resistor R13 which are connected in parallel, and the other ends of the capacitor C7 and the resistor R13 which are connected in parallel are connected with the Vout + pin of the amplifier U4. The pin Vin + of the amplifier U4 is connected to the ground through a resistor R5, the common end between the resistor R5 and the pin Vin + of the amplifier U4 is connected to one end of a capacitor C1 and a resistor R1 which are connected in parallel, and the other ends of the capacitor C1 and the resistor R1 which are connected in parallel are connected to the pin Vout of the amplifier U4. The Vout-pin and Vout + of the amplifier U4 are connected to the analog-to-digital converter through resistors R6 and R10, and a capacitor C2 is connected between the resistors R6 and R10 and the common end of the analog-to-digital converter. The Vocm pin of the amplifier U4 is connected to ground through a capacitor C5, and the common terminal between the Vocm pin and the capacitor C5 is at 2.5V. In conclusion, the lifting of the level is realized.
The AINP4 and the AINN4 of the analog-digital converter ADC are connected with the three-stage amplifying circuit as one group of interfaces, and the AINP3 and the AINN3 of the analog-digital converter ADC are connected with the three-stage amplifying circuit as the other group of interfaces. As described above, because of the dual channel, there are two three-stage amplification circuits, in which the Vout + pin and the Vout-pin of the amplifier U4 of one of the three-stage amplification circuits are respectively connected with the AINP4 pin and the AINN4 pin of the analog-to-digital converter ADC; the Vout + pin and the Vout-pin of the amplifier of the other three-stage amplifying circuit are respectively connected with the AINP3 pin and the AINN3 pin of the analog-to-digital converter ADC.
The VCOM pin of the analog-to-digital converter is connected to the positive input terminal of the amplifier U5, the negative input terminal of the amplifier U5 is connected to the output terminal of the amplifier U5, and the output terminal of the amplifier U5 inputs 2.5V voltage through the resistor R17.
The VREFP pin of the analog-to-digital converter ADC is connected to the ground through a capacitor C11, the VREFP pin of the analog-to-digital converter ADC is further connected to the output end of an amplifier U6 through a resistor R18, the output end of an amplifier U6 is further connected to the negative input end of an amplifier U6, the positive input end of an amplifier U6 is connected to the VO pin of a chip U7, the VO pin of a chip U7 is connected to the ground through a capacitor C12, the Vin pin of a chip U7 is connected to a voltage VCC, the Vin pin of a chip U7 is connected to one end of a capacitor C14 and one end of an electrolytic capacitor Cz1, the other ends of the capacitor C14 and the electrolytic capacitor Cz1 are connected to one end of a capacitor C13 and then connected to. The chip U7 outputs a reference voltage to the analog-to-digital converter ADC.
The IND pin of the chip U10 of the digital isolator is connected to the DOUT1 pin of the analog-to-digital converter ADC, and receives the converted signal.
In the embodiment, the operational amplifier follower circuit is designed by using the amplifiers U5 and U6, the input impedance is large, the output impedance is small, the incoming voltage of the two operational amplifier follower circuits is the reference level of the ADC, and the operational amplifier follower circuit is designed for stabilizing the reference voltage.
The singlechip and the USB transmission circuit are traditional circuits, and are omitted from description. The model of the singlechip is STM32F103C8T 6.
In this embodiment, since the two front-end circuits have the same structure, the circuit structure of only one front-end circuit will be described in this embodiment.
According to the above embodiment, alright realize the utility model discloses well. It is worth to say that, on the premise of the above structural design, in order to solve the same technical problem, even if some insubstantial changes or retouching are made in the utility model, the essence of the adopted technical scheme is still the same as the utility model, so it should be in the protection scope of the utility model.
Claims (10)
1. A surface electromyographic signal acquisition device comprises a conditioning circuit connected with a bioelectricity signal pickup unit, wherein the conditioning circuit comprises an amplifying circuit, and the surface electromyographic signal acquisition device is characterized in that the amplifying circuit is sequentially connected with an analog-to-digital converter (ADC) with an analog-to-digital (A/D) sampling function, a digital isolator and a single chip microcomputer, and the single chip microcomputer is in information interaction with an upper computer.
2. The surface electromyogram signal acquisition device of claim 1, wherein the conditioning circuit further comprises a transient voltage protection circuit, a lightning protection circuit, a low pass filter; the input end of the amplifying circuit is sequentially connected with a low-pass filter, a transient voltage protection circuit and a lightning protection circuit, and the myoelectric signals enter the amplifying circuit after being processed by the lightning protection circuit, the transient voltage protection circuit and the low-pass filter.
3. The surface electromyogram signal acquisition device of claim 1, wherein the amplification circuit comprises a low-noise two-way symmetrical preamplifier, a baseline drift correction circuit, a second-stage amplification circuit and a third-stage amplification circuit which are connected in sequence and used as input ends.
4. The device for acquiring the surface electromyogram signal of any one of claims 1 to 1 ~ 3, wherein the conditioning circuit has two paths, forming a dual path for a signal to enter the analog-to-digital converter.
5. The surface electromyogram signal acquisition device of any one of claims 1 ~ 3, wherein the baseline wander correction circuit comprises an integrating amplifier U2, the positive input terminal of the integrating amplifier U2 is grounded, the negative input terminal of the integrating amplifier U2 is connected to the output terminal of the low noise dual-path symmetric preamplifier through a resistor R11, a capacitor C6 is further connected between the negative input terminal and the output terminal of the integrating amplifier U2, and the output terminal of the integrating amplifier U2 is connected to the reference pin of the low noise dual-path symmetric preamplifier.
6. The device for acquiring the surface electromyographic signal according to claim 2, wherein the lightning protection circuit comprises a gas discharge tube, the transient voltage protection circuit comprises a transient suppressor diode, one end of the gas discharge tube is connected with one pole of the transient suppressor diode, the other end of the gas discharge tube is connected with the other pole of the transient suppressor diode through a resistor, a common end between the resistor and the gas discharge tube is used as an input end of the electromyographic signal, and a common end between the transient suppressor diode and the resistor is used as an output end of the electromyographic signal.
7. The surface electromyogram signal acquisition device of any one of claims 1 ~ 3, wherein the three-stage amplification circuit is a differential amplification circuit, the differential amplification circuit outputs a differential signal, a Vocm pin of an amplifier U4 of the three-stage amplification circuit is connected to ground through a capacitor C5, and a common terminal between the Vocm pin and a capacitor C5 is connected with 2.5V voltage.
8. The surface electromyogram signal acquisition device of any one of claims 1 ~ 3, wherein the VCOM pin of the analog-to-digital converter is connected to the positive input terminal of amplifier U5, the negative input terminal of amplifier U5 is connected to the output terminal of amplifier U5, the output terminal of amplifier U5 inputs 2.5V voltage through resistor R17;
the VREFP pin of the analog-to-digital converter ADC is connected to the ground through a capacitor C11, the VREFP pin of the analog-to-digital converter ADC is further connected to the output end of an amplifier U6 through a resistor R18, the output end of the amplifier U6 is further connected to the negative input end of an amplifier U6, the positive input end of an amplifier U6 is connected to the VO pin of a chip U7, the VO pin of a chip U7 is connected to the ground through a capacitor C12, the Vin pin of a chip U7 is connected to a voltage VCC, the Vin pin of a chip U7 is connected to one end of a capacitor C14 and one end of an electrolytic capacitor Cz1, the other ends of the capacitor C14 and the electrolytic capacitor Cz1 are connected to one end of a capacitor C13 and grounded, the other end of the capacitor C13 is connected to the.
9. The surface electromyogram signal acquisition device of any one of claims 1 to 1 ~ 3 wherein the single chip microcomputer is in information interaction with a host computer through a USB transmission circuit.
10. The device for acquiring the surface electromyogram signal of any one of claims 1 to 1 ~ 3, wherein a low-pass filter circuit is further connected to the front end of the second-stage amplification circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822140183.3U CN209826722U (en) | 2018-12-19 | 2018-12-19 | Surface electromyogram signal acquisition device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201822140183.3U CN209826722U (en) | 2018-12-19 | 2018-12-19 | Surface electromyogram signal acquisition device |
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| CN209826722U true CN209826722U (en) | 2019-12-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109381185A (en) * | 2018-12-19 | 2019-02-26 | 四川君健万峰医疗器械有限责任公司 | A kind of surface myoelectric signal collection apparatus |
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2018
- 2018-12-19 CN CN201822140183.3U patent/CN209826722U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109381185A (en) * | 2018-12-19 | 2019-02-26 | 四川君健万峰医疗器械有限责任公司 | A kind of surface myoelectric signal collection apparatus |
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