CN219982903U - Electrocardiogram and myoelectricity feedback combined acquisition circuit - Google Patents
Electrocardiogram and myoelectricity feedback combined acquisition circuit Download PDFInfo
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- CN219982903U CN219982903U CN202321084717.XU CN202321084717U CN219982903U CN 219982903 U CN219982903 U CN 219982903U CN 202321084717 U CN202321084717 U CN 202321084717U CN 219982903 U CN219982903 U CN 219982903U
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Abstract
The utility model relates to an electrocardio and myoelectricity feedback combined acquisition circuit which comprises an electrode plate, an AD module, an MCU chip and a frequency selection circuit, wherein the frequency selection circuit comprises a triode, a diode and an intermediate relay, the two ends of a coil of the intermediate relay are respectively connected with a high-level input and a collector electrode of the triode, and the coil of the intermediate relay is short-circuited by the diode; the system also comprises a first resistor, a second resistor, a third resistor and a fourth resistor, wherein the first resistor and the third resistor form an myoelectricity acquisition channel, and the second resistor and the fourth resistor form an electrocardio acquisition channel; the myoelectricity acquisition channel and the electrocardio acquisition channel are switched through the contact of the intermediate relay. According to the utility model, the frequency selection circuit is arranged on the basis of the main circuit consisting of the electrode plate, the AD module and the MCU chip, and the myoelectricity acquisition channel and the electrocardio acquisition channel of the frequency selection circuit are switched by the MCU chip to finish the processing of myoelectricity signals and electrocardio signals, so that myoelectricity biofeedback and electrocardiograph monitoring feedback combination is realized.
Description
Technical Field
The utility model relates to the technical field of biomedical feedback, in particular to an electrocardio and myoelectricity feedback combined acquisition circuit.
Background
Biofeedback is to accurately measure normal and abnormal physiological electric signals of nerve-muscle and autonomic nervous system by using electronic instrument, and these physiological electric signals can reflect physiological and psychological conditions of human body, and the biofeedback equipment can selectively amplify these physiological signals into auditory or visual signals, then feed them back to patient. Achieving the purpose of treating and preventing specific diseases. Biofeedback may feed back information to the person including muscle tone, skin surface temperature, brain wave activity, skin conductivity, blood pressure, heart rate, etc.
In the existing biofeedback technology, a hardware circuit is often designed only for a single feedback form, and the main reasons are that the amplitude and the main frequency range of each electric signal in biofeedback are different. If the main signal frequency range of the electromyographic signal is 20-500 Hz, the amplitude is 0-1.5mV, the main signal frequency range of the electromyographic signal is 0.5-150 Hz, the amplitude is 100 uV-5 mV, and the signals need to be processed respectively. But the body circuits of both are substantially identical. Myoelectric biofeedback and electrocardiographic monitoring feedback are commonly combined for examination, and single equipment is high in detection cost and inconvenient to operate. Therefore, a hardware circuit with myoelectric biofeedback and electrocardiographic monitoring feedback functions is needed.
Disclosure of Invention
The utility model provides an electrocardio and electrocardio feedback combined acquisition circuit for solving the problem of high cost of the existing myoelectricity biofeedback and electrocardio monitoring feedback hardware, a frequency selection circuit is arranged based on a main circuit, and the myoelectricity acquisition channel and the electrocardio acquisition channel of the frequency selection circuit are switched by an MCU chip to finish processing of myoelectricity signals and electrocardio signals, so that the myoelectricity biofeedback and electrocardio monitoring feedback combination is realized.
In order to achieve the above purpose, the utility model provides an electrocardio and myoelectricity feedback combined acquisition circuit, which comprises an electrode plate, an AD module and an MCU chip, wherein the electrode plate is connected with an instrument amplifier, the output end of the instrument amplifier is connected with a low-pass filter circuit, the low-pass filter circuit is connected with a frequency selection circuit, the frequency selection circuit is connected with the MCU chip, the output end of the frequency selection circuit is connected with a secondary amplifier,
the frequency selecting circuit comprises a triode, a diode and an intermediate relay, wherein the base electrode of the triode is connected with an IO pin of the MCU chip, the collector electrode of the triode is connected with the cathode of the diode, the anode of the diode is connected with a high-level input, the two ends of a coil of the intermediate relay are respectively connected with the high-level input and the collector electrode of the triode, and the coil of the intermediate relay is short-circuited by the diode;
the frequency selecting circuit further comprises a first resistor, a second resistor, a third resistor and a fourth resistor, wherein one end of the first resistor is connected with the low-pass filter circuit, the other end of the first resistor is connected with the same-phase end of the second-stage amplifier, one end of the third resistor is connected with the opposite-phase end of the second-stage amplifier, and the other end of the third resistor is connected with the output end of the second-stage amplifier;
one end of the second resistor is connected with the low-pass filter circuit, the other end of the second resistor is connected with the same-phase end of the second amplifier, one end of the fourth resistor is connected with the opposite-phase end of the second amplifier, and the other end of the fourth resistor is connected with the output end of the second amplifier;
the first resistor and the third resistor form an electrocardio acquisition channel, and the second resistor and the fourth resistor form an electrocardio acquisition channel;
and the myoelectricity acquisition channel and the electrocardio acquisition channel are switched through the contact of the intermediate relay.
The operation principle is as follows: designing a frequency selection circuit, wherein the resistance values of a first resistor and a second resistor are different, the resistance values of a third resistor and a fourth resistor are different, a triode is cut off under the general condition, a diode shorts the coil of the intermediate relay, at the moment, the contact of the intermediate relay is connected with the first resistor and the third resistor, the first resistor is used for adjusting the frequency of an electromyographic signal, the third resistor is used for adjusting the amplification factor of a secondary amplifier, at the moment, electromyographic signal acquisition can be carried out, and the electromyographic signal is output to an MCU chip;
the triode is conducted through the MCU chip output signal, the diode is further cut off, the coil of the intermediate relay is electrified, further the contact of the intermediate relay is connected with the second resistor and the fourth resistor, the electrocardiosignal frequency is adjusted by the second resistor, the amplification factor of the secondary amplifier is adjusted by the fourth resistor, at the moment, the myoelectricity acquisition channel is closed, the electrocardiosignal can be acquired, and the output myoelectricity signal is transmitted to the MCU chip.
Further, the instrumentation amplifier is also electrically connected to a common measurement terminal. The common measurement end is connected to the midpoint of the measurement of the body.
Further, the output end of the secondary amplifier is connected with a power frequency trap, the output end of the power frequency trap is connected with a potential lifting circuit, the output end of the potential lifting circuit is connected with an AD module, the AD module is connected with the input end of the MCU chip, and the IO pin of the MCU chip is connected with an input unit;
and a clamping circuit is electrically connected between the power frequency trap and the lifting circuit.
And filtering out power frequency interference through a power frequency trapper.
Further, the potential lifting circuit comprises a first amplifier and a second amplifier, wherein the output end of the first amplifier is connected with the same-phase end of the second amplifier, the output end of the second amplifier is connected with the AD module, and the same-phase end of the second amplifier is also connected with the clamping circuit.
Then, the electric signal output accords with the AD conversion interval through the clamping circuit potential lifting circuit.
Further, the input unit comprises a key unit, the key unit comprises a plurality of keys, and the keys are connected with IO pins of the MCU chip.
When the myoelectricity acquisition and the electrocardio acquisition are switched, the myoelectricity acquisition and the electrocardio acquisition are selected through the key unit, and the switching on and off of the triode is controlled after the MCU chip receives the signals of the key unit.
Through the technical scheme, the utility model has the beneficial effects that:
the utility model realizes the switching between myoelectricity acquisition and electrocardio acquisition, and sets the frequency selection circuit, the frequency selection circuit is controlled by the MCU chip, other parts still adopt the original circuit, and after the myoelectricity acquisition or electrocardio acquisition is determined to be carried out, the original circuit is connected into a myoelectricity acquisition channel or an electrocardio acquisition channel by the MCU chip. The utility model can realize electrocardio and electromyographic signal acquisition under the condition that most devices are shared, and saves a great deal of device cost for related instruments and equipment.
Drawings
FIG. 1 is a main circuit of an electrocardio and myoelectricity feedback combined acquisition circuit of the utility model;
FIG. 2 is a frequency selection circuit of the combined electrocardio and myoelectricity feedback acquisition circuit of the utility model;
fig. 3 is an electrical schematic diagram of an electrocardio and myoelectricity feedback combined acquisition circuit of the utility model.
Reference numerals: 1 is an AD module, 2 is an MCU chip, 3 is an instrument amplifier, 4 is a secondary amplifier, 5 is a triode, 6 is a diode, 7 is an intermediate relay, 8 is a first resistor, 9 is a second resistor, 10 is a third resistor, 11 is a fourth resistor, 12 is a common measuring end, 13 is a power frequency trapper, 14 is a potential lifting circuit, 15 is an input unit, and 16 is a clamping circuit.
Detailed Description
The utility model is further described with reference to the drawings and detailed description which follow:
example 1
As shown in fig. 1-3, an electrocardio and myoelectricity feedback combined acquisition circuit comprises an electrode plate, an AD module 1 and an MCU chip 2, wherein the electrode plate is connected with an instrument amplifier 3, the output end of the instrument amplifier 3 is connected with a low-pass filter circuit, the low-pass filter circuit is connected with a frequency selection circuit, the frequency selection circuit is connected with the MCU chip 2, the output end of the frequency selection circuit is connected with a secondary amplifier 4, the frequency selection circuit comprises a triode 5, a diode 6 and an intermediate relay 7, the base electrode of the triode 5 is connected with an IO pin of the MCU chip 2, the collector electrode is connected with the negative electrode of the diode 6, the positive electrode of the diode 6 is connected with a high-level input, the two ends of a coil of the intermediate relay 7 are respectively connected with the high-level input and the collector electrode of the triode 5, and the coil of the intermediate relay 7 is short-circuited by the diode 6; the frequency selecting circuit further comprises a first resistor 8, a second resistor 9, a third resistor 10 and a fourth resistor 11, wherein one end of the first resistor 8 is connected with the low-pass filter circuit, the other end of the first resistor is connected with the same-phase end of the second-stage amplifier 4, one end of the third resistor 10 is connected with the opposite-phase end of the second-stage amplifier 4, and the other end of the third resistor is connected with the output end of the second-stage amplifier 4; one end of the second resistor 9 is connected with the low-pass filter circuit, the other end of the second resistor is connected with the same-phase end of the second-stage amplifier 4, one end of the fourth resistor 11 is connected with the opposite-phase end of the second-stage amplifier 4, and the other end of the fourth resistor is connected with the output end of the second-stage amplifier 4; the first resistor 8 and the third resistor 10 form an electrocardio acquisition channel, and the second resistor 9 and the fourth resistor 11 form an electrocardio acquisition channel; the myoelectricity acquisition channel and the electrocardio acquisition channel are switched through the contact of the intermediate relay 7.
Preferably, the instrumentation amplifier 3 is also electrically connected to a common measurement terminal 12.
Preferably, the output end of the secondary amplifier 4 is connected with a power frequency trap 13, the output end of the power frequency trap 13 is connected with a potential lifting circuit 14, the output end of the potential lifting circuit 14 is connected with an AD module 1, the AD module 1 is connected with the input end of the MCU chip 2, and an IO pin of the MCU chip 2 is connected with an input unit 15;
a clamping circuit 16 is electrically connected between the power frequency trap 13 and the lifting circuit 14.
Preferably, the potential boosting circuit 14 includes a first amplifier and a second amplifier, where an output end of the first amplifier is connected to an in-phase end of the second amplifier, an output end of the second amplifier is connected to the AD module 1, and an in-phase end of the second amplifier is further connected to the clamping circuit 16.
Preferably, the input unit 15 includes a key unit, where the key unit includes a plurality of keys, and the keys are connected to the IO pins of the MCU chip 2.
As shown in fig. 1 and 2, during wiring, the point a of the output end of the instrumentation amplifier 3 is connected to the point a of the frequency selection circuit, the point B of the frequency selection circuit is connected to the point B of the reverse end of the secondary amplifier 4, the point B 'of the frequency selection circuit is connected to the point B' of the output end of the secondary amplifier 4, and the point C of the clamp circuit 16 is connected to the point C of the output end of the first amplifier.
In this embodiment, the MCU chip 2 is AN STM32 type singlechip, the MCU chip 2 and the AD module are connected through a UART serial port in communication, the instrumentation amplifier 3 is AN AD620AN type chip, and the second amplifier 4, the first amplifier and the second amplifier are TL082BCDT type chips.
The main signal frequency range of the combined electromyographic signals is 20-500 Hz, the amplitude is 0-1.5mV, the main signal frequency range of the electromyographic signals is 0.5-150 Hz, the amplitude is 100 uV-5 mV, the resistance value of the first resistor 8 is 33kΩ, the resistance value of the second resistor 9 is 10MΩ, the third resistor 10 is 100kΩ, and the fourth resistor 11 is 50kΩ.
Myoelectricity collection: when a key is pressed, the MCU chip 2 receives a key signal, the MCU chip 2 enables the triode 5 to be cut off, the diode 6 is in a conducting state, the coil of the intermediate relay 7 is powered off, and at the moment, the contact of the intermediate relay 7 is connected with the first resistor 8 and the third resistor 10.
The positive end and the negative end of the electrode plate BACK2+/-are respectively connected into a body part to be measured, the public measuring end is connected into the middle point of the body measurement, the electromyographic signals enter the instrument amplifier 3 through the front-stage resistor and the capacitor, the high-frequency signals are filtered through the low-pass filter after being amplified by 11 times of the instrument, the starting frequency of the electromyographic signals is 20Hz (the cut-off frequency of the high frequency is 10 kHz), the first resistor 8 and 33kΩ are connected through the contact of the intermediate relay 7, the cut-off frequency is 10Hz, and the electromyographic signals can pass through and enter the secondary amplifier 4, and at the moment, the third resistor 10 is connected and the amplification factor is 100 times.
Then the electromyographic signals pass through a 50Hz power frequency wave trap to remove power frequency interference, then pass through a clamping circuit 16 and a potential lifting circuit 14, the electromyographic signals are lifted by about 1V to an interval suitable for AD conversion, and finally the signals enter an MCU chip 2 through an AD module 1.
And (3) electrocardio acquisition: when a key is pressed, the MCU chip 2 receives a key signal, the MCU chip 2 enables the triode 5 to be conducted, the diode 6 is in a cut-off state, the coil of the intermediate relay 7 is electrified, and at the moment, the contact of the intermediate relay 7 is connected with the second resistor 9 and the fourth resistor 11.
The positive and negative ends BACK 2+/-of the electrode plates are respectively connected into a body part to be measured, the public measuring end is connected into the middle point of the body for measurement, an electrocardiosignal enters the instrument amplifier 3 through the front-stage resistor and the capacitor, the electrocardiosignal is amplified by 11 times of the instrument, then the high-frequency signal is filtered through the low-pass filter, the initial frequency of the electrocardiosignal is 1Hz, the second resistor 9 and 10MΩ are connected through the contact of the intermediate relay 7, the cut-off frequency is 0.03Hz, the electrocardiosignal can pass through and enter the secondary amplifier 4, and the fourth resistor 11 is connected at the moment, and the amplification factor is 50 times.
Then the electrocardiosignal passes through a 50Hz power frequency trap to remove power frequency interference, then passes through a clamping circuit 16 and a potential lifting circuit 14, the electrocardiosignal is lifted by about 1V to an interval suitable for AD conversion, and finally the signal enters the MCU chip 2 through the AD module 1.
The above-described embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model, so that all equivalent changes or modifications of the structure, characteristics and principles described in the claims should be included in the scope of the present utility model.
Claims (5)
1. The electrocardio and myoelectricity feedback combined acquisition circuit comprises an electrode plate, an AD module (1) and an MCU chip (2), and is characterized in that the electrode plate is connected with an instrument amplifier (3), the output end of the instrument amplifier (3) is connected with a low-pass filter circuit, the low-pass filter circuit is connected with a frequency selection circuit, the frequency selection circuit is connected with the MCU chip (2), the output end of the frequency selection circuit is connected with a secondary amplifier (4),
the frequency selection circuit comprises a triode (5), a diode (6) and an intermediate relay (7), wherein the base electrode of the triode (5) is connected with an IO pin of the MCU chip (2), the collector electrode is connected with the cathode of the diode (6), the anode of the diode (6) is connected with high-level input, the two ends of a coil of the intermediate relay (7) are respectively connected with the high-level input and the collector electrode of the triode (5), and the coil of the intermediate relay (7) is short-circuited by the diode (6);
the frequency selecting circuit further comprises a first resistor (8), a second resistor (9), a third resistor (10) and a fourth resistor (11), wherein one end of the first resistor (8) is connected with the low-pass filter circuit, the other end of the first resistor is connected with the same-phase end of the second-stage amplifier (4), one end of the third resistor (10) is connected with the opposite-phase end of the second-stage amplifier (4), and the other end of the third resistor is connected with the output end of the second-stage amplifier (4);
one end of the second resistor (9) is connected with the low-pass filter circuit, the other end of the second resistor is connected with the same-phase end of the second-stage amplifier (4), one end of the fourth resistor (11) is connected with the opposite-phase end of the second-stage amplifier (4), and the other end of the fourth resistor is connected with the output end of the second-stage amplifier (4);
the first resistor (8) and the third resistor (10) form an electrocardio acquisition channel, and the second resistor (9) and the fourth resistor (11) form an electrocardio acquisition channel;
and the myoelectricity acquisition channel and the electrocardio acquisition channel are switched through the contact of the intermediate relay (7).
2. An electrocardio and myoelectricity feedback combined acquisition circuit as claimed in claim 1, characterized in that the instrument amplifier (3) is further electrically connected with a common measuring end (12).
3. The combined electrocardio and myoelectricity feedback acquisition circuit according to claim 1, wherein the output end of the secondary amplifier (4) is connected with a power frequency trapper (13), the output end of the power frequency trapper (13) is connected with a potential lifting circuit (14), the output end of the potential lifting circuit (14) is connected with an AD module (1), the AD module (1) is connected with the input end of the MCU chip (2), and an IO pin of the MCU chip (2) is connected with an input unit (15);
a clamping circuit (16) is electrically connected between the power frequency wave trap (13) and the lifting circuit (14).
4. A combined electrocardio and myoelectricity feedback acquisition circuit as claimed in claim 3, characterized in that the potential lifting circuit (14) comprises a first amplifier and a second amplifier, the output end of the first amplifier is connected with the same phase end of the second amplifier, the output end of the second amplifier is connected with the AD module (1), and the same phase end of the second amplifier is also connected with the clamping circuit (16).
5. The combined electrocardio and myoelectricity feedback acquisition circuit according to claim 1, wherein the input unit (15) comprises a key unit, the key unit comprises a plurality of keys, and the keys are connected with IO pins of the MCU chip (2).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321084717.XU CN219982903U (en) | 2023-05-08 | 2023-05-08 | Electrocardiogram and myoelectricity feedback combined acquisition circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321084717.XU CN219982903U (en) | 2023-05-08 | 2023-05-08 | Electrocardiogram and myoelectricity feedback combined acquisition circuit |
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| CN219982903U true CN219982903U (en) | 2023-11-10 |
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| CN202321084717.XU Active CN219982903U (en) | 2023-05-08 | 2023-05-08 | Electrocardiogram and myoelectricity feedback combined acquisition circuit |
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- 2023-05-08 CN CN202321084717.XU patent/CN219982903U/en active Active
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