CN215227730U - Common mode rejection ratio testing device and myoelectricity biofeedback instrument system - Google Patents

Common mode rejection ratio testing device and myoelectricity biofeedback instrument system Download PDF

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CN215227730U
CN215227730U CN202022559671.5U CN202022559671U CN215227730U CN 215227730 U CN215227730 U CN 215227730U CN 202022559671 U CN202022559671 U CN 202022559671U CN 215227730 U CN215227730 U CN 215227730U
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module
switch
rejection ratio
mode rejection
common mode
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何永正
宋静
朱小伟
樊鹏杰
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Henan Xiangyu Medical Equipment Co Ltd
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Henan Xiangyu Medical Equipment Co Ltd
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Abstract

The utility model discloses a common mode rejection ratio testing arrangement, in this scheme, common mode rejection ratio testing arrangement includes voltage regulating module, voltage contravariant module, signal attenuation module and treater, and voltage regulating module carries out the pressure regulating to the direct current that the power provided, and the voltage contravariant module carries out the contravariant to the direct current that carries out the pressure regulating and obtains the alternating current, then the signal attenuation module attenuates the alternating current, obtains the attenuation alternating current, and the treater is based on alternating current and attenuation alternating current and confirms common mode rejection ratio. Therefore, the scheme can generate the alternating current signals required by the electromyographic biofeedback instrument through the voltage regulating module and the voltage inversion module, and is small in occupied space and convenient to carry; and the processor can directly obtain the common mode rejection ratio, and a calculator is not needed to be used for calculating the common mode rejection ratio, so that the labor cost is saved, and the calculation efficiency is improved. The utility model also discloses a flesh electricity biofeedback appearance system has the same beneficial effect with above-mentioned common mode rejection ratio testing arrangement.

Description

Common mode rejection ratio testing device and myoelectricity biofeedback instrument system
Technical Field
The utility model relates to an electronic circuit and medical equipment field especially relate to a common mode rejection ratio testing arrangement and flesh electricity biofeedback appearance system.
Background
The electromyographic biofeedback instrument is an instrument which uses a surface motor to collect electromyographic signals of a human body as physiological information and feeds the physiological information back to a patient in the forms of vision or hearing and the like, so that the patient can learn to consciously control the psychophysiological activities of the patient to treat diseases.
The electromyographic biofeedback instrument internally comprises an amplifier, and the ratio of the voltage amplification factor of the amplifier to a differential mode signal to the voltage amplification factor of a common mode signal is called as a common mode rejection ratio. The common mode rejection ratio can be used as a comprehensive measure of how well the common mode signal is rejected by the amplifier.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a device for testing a common mode rejection ratio in the prior art. In the prior art, the common mode rejection ratio is tested by generating a 2-frequency-doubled sinusoidal alternating current signal with amplitude of 1V-5V and frequency of power frequency through a signal generator, reading a signal source output value and a myoelectricity biofeedback instrument display value, and substituting the signal source output value and the myoelectricity biofeedback instrument display value into the signal generator
Figure BDA0002765306640000011
Wherein CMRR is common mode rejection ratio, VinFor the signal source output value, VoAnd displaying the value for the myoelectricity biofeedback instrument.
However, in this test method, a plurality of tools such as the signal generator 1, the test circuit 2, and the calculator need to be prepared during the test process, so that the preparation work of the tester is increased, the plurality of tools occupy a large space and are inconvenient to carry, and the efficiency of calculating the common mode rejection ratio by manually using the calculator is low.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a common mode rejection ratio testing arrangement and flesh electricity biofeedback appearance system, can generate the required alternating current signal of flesh electricity biofeedback appearance through voltage regulating module, voltage contravariant module, occupation space is little and portable; and the processor can directly obtain the common mode rejection ratio, and a calculator is not needed to be used for calculating the common mode rejection ratio, so that the labor cost is saved, and the calculation efficiency is improved.
In order to solve the technical problem, the utility model provides a common mode rejection ratio testing arrangement, include:
the voltage regulating module is connected with the power supply at the input end and connected with the input end of the voltage inversion module at the output end and is used for regulating the voltage of the direct current provided by the power supply;
the voltage inversion module is connected with the output end of the signal attenuation module and used for obtaining alternating current based on the regulated direct current;
the signal attenuation module is connected with the acquisition end of the electromyographic biofeedback instrument at the output end and is used for attenuating the alternating current output by the voltage inversion module to obtain attenuated alternating current;
and the processor is connected with the electromyographic biofeedback instrument and is used for determining a common-mode rejection ratio based on the alternating current and the attenuated alternating current which are acquired by the electromyographic biofeedback instrument.
Preferably, the voltage regulation module includes:
the first switch is connected with the output positive end of the power supply at the first end, connected with the cathode of the follow current module at the second end and connected with the processor at the control end;
the anode of the follow current module is connected with the negative output end of the power supply;
the first inductor is used for reducing the voltage of the direct current, and has a first end connected with the cathode of the follow current module and the second end of the first switch and a second end connected with the first end of the first capacitor;
the second end of the first capacitor is connected with the anode of the follow current module;
the first end with the first end of first electric capacity and the second end of first inductance is connected and is connected the common terminal and conduct the positive end of output, the second end of pressure regulating module with the second end of first electric capacity and the positive pole of afterflow module is connected and is connected the common terminal and conduct the first resistance of the negative end of output of pressure regulating module.
Preferably, the voltage inverting module includes:
the first end of the second switch is connected with the output positive end of the voltage regulating module, the second end of the second switch is connected with the first end of the fourth switch, and the control end of the second switch is connected with the processor;
the first end of the third switch is connected with the output positive end of the voltage regulating module and the first end of the second switch, the second end of the third switch is connected with the first end of the fifth switch, and the control end of the third switch is connected with the processor;
the first end of the fourth switch is connected with the second end of the second switch, the second end of the fourth switch is connected with the output negative end of the voltage regulating module, and the control end of the fourth switch is connected with the processor;
the first end of the fifth switch is connected with the second end of the third switch, the second end of the fifth switch is connected with the output negative end of the voltage regulating module and the second end of the fourth switch, and the control end of the fifth switch is connected with the processor;
the first end of the second resistor is connected with the second end of the second switch and the first end of the fourth switch, and the first end of the second resistor is connected with a common end which is used as an output positive end of the voltage inversion module;
and the second end of the second inductor is connected with the second end of the third switch and the first end of the fifth switch, and a common end of the second inductor is used as the output negative end of the voltage inversion module.
Preferably, the signal attenuation module includes:
the first end of the third resistor is used as the input positive end of the signal attenuation module, and the second end of the third resistor is connected with the first end of the fourth resistor;
the second end of the fourth resistor is connected with the first acquisition end of the electromyographic biofeedback instrument;
the third capacitor is connected in parallel to two ends of the fourth resistor;
the first end of the fifth resistor is connected with the second end of the third resistor, and the second end of the fifth resistor is connected with the second acquisition end of the electromyographic biofeedback instrument;
the fourth capacitor is connected in parallel to two ends of the fifth resistor;
the first end of the sixth resistor is connected with the second end of the third resistor, and the second end of the sixth resistor is connected with the third acquisition end of the electromyographic biofeedback instrument;
the fifth capacitor is connected in parallel to two ends of the sixth resistor;
the collection end of the myoelectricity biofeedback instrument comprises the first collection end, the second collection end and the third collection end.
Preferably, the method further comprises the following steps:
the openable shielding box is used for placing the common mode rejection ratio testing device and/or the myoelectricity biofeedback instrument.
Preferably, the openable and closable shield case includes:
the first chamber is used for placing the common mode rejection ratio testing device;
and the second cavity is used for placing the electromyographic biofeedback instrument.
Preferably, the method further comprises the following steps:
an input module coupled to the processor for inputting the alternating current and the attenuated alternating current to the processor for the processor to determine the common mode rejection ratio based on the alternating current and the attenuated alternating current.
Preferably, the method further comprises the following steps:
a display module coupled to the processor and the input module for displaying the common mode rejection ratio determined by the processor based on the alternating current and the attenuated alternating current.
Preferably, the input module is a key.
In order to solve the technical problem, the utility model also provides a flesh electricity biofeedback appearance system, include flesh electricity biofeedback appearance still includes as above-mentioned common mode rejection ratio testing arrangement.
The utility model provides a common mode rejection ratio testing arrangement for obtain the inside common mode rejection ratio of flesh electricity biofeedback appearance, in this scheme, common mode rejection ratio testing arrangement includes the pressure regulating module, the voltage contravariant module, signal attenuation module and treater, the direct current that the pressure regulating module provided the power adjusts the pressure, the voltage contravariant module carries out the contravariant to the direct current that carries out the pressure regulating and obtains the alternating current, then the signal attenuation module attenuates the alternating current, obtain the decay alternating current, the treater is based on alternating current and decay alternating current and confirms common mode rejection ratio. Therefore, the scheme can generate the alternating current signals required by the electromyographic biofeedback instrument through the voltage regulating module and the voltage inversion module, and is small in occupied space and convenient to carry; and the processor can directly obtain the common mode rejection ratio, and a calculator is not needed to be used for calculating the common mode rejection ratio, so that the labor cost is saved, and the calculation efficiency is improved.
The utility model also provides a flesh electricity biofeedback appearance system has the same beneficial effect with above-mentioned common mode rejection ratio testing arrangement.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required in the prior art and the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic diagram of a prior art apparatus for testing common mode rejection ratio;
fig. 2 is a schematic structural diagram of a common mode rejection ratio testing apparatus provided by the present invention;
fig. 3 is a circuit structure diagram of a voltage reduction chip provided by the present invention;
fig. 4 is a circuit diagram of a voltage regulation module according to the present invention;
fig. 5 is a circuit structure diagram of a voltage inverter module according to the present invention;
fig. 6 is a circuit structure diagram of a signal attenuation module according to the present invention;
fig. 7 is a schematic structural diagram of the shield box that can be opened and closed provided by the present invention.
Detailed Description
The utility model has the core that the common mode rejection ratio testing device and the myoelectricity biofeedback instrument system are provided, the alternating current signals required by the myoelectricity biofeedback instrument can be generated through the voltage regulating module and the voltage inversion module, the occupied space is small, and the carrying is convenient; and the processor can directly obtain the common mode rejection ratio, and a calculator is not needed to be used for calculating the common mode rejection ratio, so that the labor cost is saved, and the calculation efficiency is improved.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, fig. 2 and fig. 3, fig. 1 is a schematic structural diagram of a device for testing a common mode rejection ratio in the prior art, fig. 2 is a schematic structural diagram of a device for testing a common mode rejection ratio provided by the present invention, and fig. 3 is a circuit structural diagram of a voltage reduction chip provided by the present invention.
The common mode rejection ratio testing device comprises:
the voltage regulating module 3 is connected with the power supply at the input end and connected with the input end of the voltage inversion module 4 at the output end and is used for regulating the voltage of the direct current provided by the power supply;
the voltage inversion module 4 is connected with the output end of the signal attenuation module 5 and used for obtaining alternating current based on the regulated direct current;
the signal attenuation module 5 is connected with the acquisition end of the electromyographic biofeedback instrument at the output end and is used for attenuating the alternating current output by the voltage inversion module 4 to obtain attenuated alternating current;
and the processor 6 is connected with the electromyographic biofeedback instrument and is used for determining the common-mode rejection ratio based on the alternating current and the attenuated alternating current acquired by the electromyographic biofeedback instrument.
The applicant considers that the electromyographic biofeedback meter internally comprises an amplifier, the ratio of the voltage amplification of the amplifier for differential mode signals to the voltage amplification for common mode signals being called the common mode rejection ratio. The common mode rejection ratio can be used as a comprehensive measure of how well the common mode signal is rejected by the amplifier.
In the prior art, the common mode rejection ratio is tested by generating a 2-frequency-doubled sinusoidal alternating current signal with the amplitude of 1V-5V and the frequency of power frequency through a signal generator, reading the sinusoidal alternating current signal, and substituting the sinusoidal alternating current signal into the power frequency
Figure BDA0002765306640000061
Wherein CMRR is common mode rejection ratio, VinFor the signal source output value, VoAnd displaying the value for the myoelectricity biofeedback instrument.
However, in this test method, a plurality of tools such as the signal generator 1, the test circuit 2, and the calculator need to be prepared during the test process, so that the preparation work of the tester is increased, the plurality of tools occupy a large space and are inconvenient to carry, and the efficiency of calculating the common mode rejection ratio by manually using the calculator is low.
In the present embodiment, the common mode rejection ratio testing apparatus includes a voltage regulating module 3, a voltage inverting module 4, a signal attenuating module 5, and a processor 6. The voltage regulating module 3 regulates the direct current provided by the power supply, the voltage inverting module 4 inverts the regulated direct current to obtain alternating current, the signal attenuation module 5 attenuates the alternating current to obtain attenuated alternating current, and the processor 6 determines the common mode rejection ratio based on the alternating current and the attenuated alternating current.
In addition, the power source is a rechargeable lithium battery, but the power source is not limited to the rechargeable lithium battery, and the type of the power source is not particularly limited in this application.
It should be noted that processor 6 determines the common mode rejection ratio based on the ac power and the attenuated ac power, and specificallyThe processor 6 is also based on the formula
Figure BDA0002765306640000062
Wherein CMRR is common mode rejection ratio, VinIs an alternating current, VoTo attenuate alternating current.
Of course, the way of obtaining the common mode rejection ratio by the processor 6 is not limited to the calculation according to the formula, and the application is not limited to how the processor 6 obtains the common mode rejection ratio specifically.
In addition, the signal attenuation module 5 is used for simulating the impedance of the skin and the electrode, attenuating the alternating current and transmitting the attenuated signal to the acquisition end of the electromyographic biofeedback instrument.
It should be noted that, because the dc power provided by the power supply is 7.4V, and the processor 6 needs 3.3V dc power, the AMS1117-3.3 buck chip is selected to adjust the 7.4V dc power provided by the power supply to 3.3V dc power, so as to supply power to the processor 6, and the connection manner between the AMS1117-3.3 buck chip and the processor 6 is as shown in fig. 3, where the capacitor C26 and the capacitor C28 are used to filter low-frequency signals in the circuit, and the capacitor C27 is used to filter high-frequency signals in the circuit.
Of course, the power supply to the processor 6 is not limited to the voltage regulation by the AMS1117-3.3 buck chip, and the application is not limited to the specific power supply to the processor 6.
In conclusion, the voltage regulating module 3 and the voltage inverting module 4 can generate the alternating current signals required by the myoelectric biofeedback instrument, so that the myoelectric biofeedback instrument is small in occupied space and convenient to carry; and the processor 6 can directly obtain the common mode rejection ratio, and a calculator is not needed to be used for calculating the common mode rejection ratio, so that the labor cost is saved, and the calculation efficiency is improved.
Please refer to fig. 4, fig. 5 and fig. 6, fig. 4 is a circuit connection diagram of a voltage regulation module provided by the present invention, fig. 5 is a circuit structure diagram of a voltage inversion module provided by the present invention, and fig. 6 is a circuit structure diagram of a signal attenuation module provided by the present invention.
On the basis of the above-described embodiment:
as a preferred embodiment, the voltage regulating module 3 includes:
the first switch is connected with the positive output end of the power supply at the first end, connected with the cathode of the follow current module at the second end and connected with the processor 6 at the control end;
the anode of the follow current module is connected with the output negative end of the power supply;
the first inductor is used for reducing the direct current, and the first end of the first inductor is connected with the cathode of the follow current module and the second end of the first switch;
the second end of the first capacitor is connected with the anode of the follow current module;
the first end of the first resistor is connected with the first end of the first capacitor and the second end of the first inductor, and the first resistor is connected with the common end as the positive output end of the voltage regulating module 3, and the second end of the first resistor is connected with the second end of the first capacitor and the anode of the freewheeling module, and the common end of the first resistor is connected as the negative output end of the voltage regulating module 3.
Considering that the electromyographic biofeedback instrument needs an alternating current signal with a certain frequency and amplitude, and the power supply provides direct current, voltage regulation processing needs to be performed on the direct current provided by the power supply. In this embodiment, the voltage regulating module 3 employs a basic Buck circuit. Specifically, when the first switch is turned on, the first inductor is charged with magnetism and stores energy, the voltage of direct current provided by the power supply is reduced after the direct current passes through the first inductor, and meanwhile, the first capacitor is charged; when the first switch is turned off, the first capacitor discharges, and meanwhile, the magnetic energy of the first inductor forms a loop through the first resistor and the follow current module to be released. The mode can carry out voltage reduction treatment on direct current provided by the power supply. In addition, Buck step-down circuit simple structure, each components and parts are very common, still have the voltage regulation simultaneously and efficient, and output voltage can adjust at will, and output current wave form is level and smooth, and the filter effect is good, advantage that direct current loss is little.
It should be noted that, here, the processor 6 adjusts a PWM (Pulse Width Modulation) wave of the first switch to control the on-time and the frequency of the first switch, so as to implement voltage reduction of the dc power provided by the power supply.
Of course, the control of the on-time and frequency of the first switch is not limited to the adjustment of the PWM wave of the first switch by the processor 6, and the application is not limited thereto.
It should be noted that the first inductor is used for energy storage and voltage reduction, and at the same time, plays a role in current limiting, and particularly at the moment of main power supply, if the first capacitor is directly charged, the charging current is very large, which may cause the capacitor to explode; in addition, the first inductor can reduce current ripples in the Buck voltage reduction circuit, and the capacitance value of the first capacitor design can be reduced.
The freewheel module is usually a diode, but the freewheel module is not limited to a diode, and the present application is not limited thereto.
As a preferred embodiment, the voltage inverting module 4 includes:
the first end of the second switch is connected with the output positive end of the voltage regulating module 3, the second end of the second switch is connected with the first end of the fourth switch, and the control end of the second switch is connected with the processor 6;
the first end of the third switch is connected with the output positive end of the voltage regulating module 3 and the first end of the second switch, the second end of the third switch is connected with the first end of the fifth switch, and the control end of the third switch is connected with the processor 6;
a fourth switch, the first end of which is connected with the second end of the second switch, the second end of which is connected with the output negative end of the voltage regulating module 3, and the control end of which is connected with the processor 6;
a fifth switch, the first end of which is connected with the second end of the third switch, the second end of which is connected with the negative output end of the voltage regulating module 3 and the second end of the fourth switch, and the control end of which is connected with the processor 6;
a second resistor, a first end of which is connected with the second end of the second switch and the first end of the fourth switch and a common end of which is used as an output positive end of the voltage inversion module 4, and a second end of which is connected with the first end of the second inductor;
the second end of the second inductor is connected with the second end of the third switch and the first end of the fifth switch, and the second end of the second inductor is connected with the common end to serve as the output negative end of the voltage inverter module 4.
Considering that the electromyographic biofeedback instrument needs an ac signal with a certain frequency and amplitude, the dc signal with a certain amplitude is obtained through the voltage regulating module 3 in the previous embodiment, and therefore the dc signal needs to be adjusted to an ac signal. In the present embodiment, the voltage inverter module 4 employs a basic H-bridge circuit. Specifically, the conduction frequency of the switching tube is controlled by the processor 6, for example, a low level is output at 0s to trigger the second switch and the fifth switch to be turned on, and the third switch and the fourth switch to be turned off; then the second switch and the fifth switch are closed in 5ms, and the third switch and the fourth switch are conducted; thus, a 5ms positive voltage and a 5ms negative voltage can be formed, namely a 10ms period is formed, the positive and negative change once in the 10ms period, and the sine wave which forms the positive and negative alternate change is repeatedly output in the way, wherein the period is 10ms, namely 100 Hz. The second resistor and the second inductor are connected in series to serve as a load, and if only the second resistor serves as the load, the output waveform is a square waveform; the output waveform is a triangular waveform if only the second inductor is used as the load. And the second inductor can prevent sudden change of current, so that the rising and the falling of the current become smooth. Therefore, the alternating current signal with the sine wave shape can be obtained by the arrangement mode.
It should be noted that, because the passband range requirement in the standard is 20Hz to 500Hz, and specifically, how much is set according to the actual situation, the adjustable range of the output end frequency of the voltage inverter module 4 is set to 20Hz to 500Hz here.
In addition, a freewheeling diode can be connected in parallel to two ends of the second switch and/or the third switch and/or the fourth switch and/or the fifth switch, and the freewheeling diode plays a freewheeling role to avoid distortion of the output waveform of the output end of the voltage inversion module 4.
As a preferred embodiment, the signal attenuation module 5 comprises:
the first end of the third resistor is used as the input positive end of the signal attenuation module 5, and the second end of the third resistor is connected with the first end of the fourth resistor;
the second end of the fourth resistor is connected with the first acquisition end of the electromyographic biofeedback instrument;
the third capacitor is connected in parallel to two ends of the fourth resistor;
the first end of the fifth resistor is connected with the second end of the third resistor, and the second end of the fifth resistor is connected with the second acquisition end of the electromyographic biofeedback instrument;
the fourth capacitor is connected in parallel to two ends of the fifth resistor;
the first end of the sixth resistor is connected with the second end of the third resistor, and the second end of the sixth resistor is connected with the third acquisition end of the electromyographic biofeedback instrument;
the fifth capacitor is connected in parallel to two ends of the sixth resistor;
the collection end of the myoelectricity biofeedback instrument comprises a first collection end, a second collection end and a third collection end.
Considering that the electromyographic biofeedback instrument has the capability of inhibiting the power frequency signal interference on the surface of the human body, in the embodiment, the signal attenuation module 5 is arranged to simulate the impedance of the skin-electrode. In this embodiment, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a third capacitor connected in parallel to both ends of the fourth resistor, a fourth capacitor connected in parallel to both ends of the fifth resistor, and a fifth capacitor connected in parallel to both ends of the sixth resistor are provided, and the alternating current obtained by the voltage inverter module 4 is attenuated to obtain attenuated alternating current.
It should be noted that the third resistor is reserved for matching circuit parameters, and after the circuit parameters and performance are actually selected by debugging, the third resistor is replaced by a resistor with a proper resistance value.
Further, according to jjjg 1043-2008 table 1, here the fourth resistor, the fifth resistor, and the sixth resistor are all set to 51k Ω, and the third capacitor, the fourth capacitor, and the fifth capacitor are all set to 47 nF.
It should be noted that it is difficult to perform measurement in the front end of the high input impedance amplifier, and since the fourth resistor, the fifth resistor and the sixth resistor of 51k Ω introduce significant noise, the shielding case is used for shielding to reduce the input of external environment noise, and the shielding case is grounded to exert shielding effectiveness.
In addition, only two electrode connections (corresponding to the first collection end out1 and the second collection end out2 in the scheme) of the electromyographic biofeedback instrument are shown in the YY1095-2015 standard 6.1.3 test circuit. However, the myoelectric biofeedback instruments with three electrodes connected are also available in the market, most of the myoelectric biofeedback instruments have an electrode falling prompting function, when any one electrode is not connected, the electrode falling is prompted, so that the myoelectric biofeedback instruments cannot work normally, and under the condition, the third acquisition end out3 is connected according to contact resistance.
Please refer to fig. 7, fig. 7 is a schematic structural diagram of an openable and closable shielding box according to the present invention.
As a preferred embodiment, further comprising:
the shielding box can be opened and closed and is used for placing a common mode rejection ratio testing device and/or a myoelectricity biofeedback instrument.
The applicant considers that if the electromyographic biofeedback instrument is directly in a natural environment, the electromyographic biofeedback instrument is easily interfered by various signals, so that final test data is not accurate enough and even exceeds a required range, and the workload of a designer for checking the cause of the test problem needs to be increased. In this embodiment, the openable and closable shielding box that can put into common mode rejection ratio testing arrangement and/or flesh electricity biofeedback appearance has been increased, can reduce external environment interference, makes the useful signal that equipment under test gathered more accurate, and then test data is more accurate.
In addition, the openable and closable shield box herein includes a shield cover 75 capable of being closed or opened, and is usually set to a flip mode in practical applications, but not limited to the flip mode, and the present application is not particularly limited to the specific form of the shield cover 75 of the openable and closable shield box.
As a preferred embodiment, the openable and closable shield box includes:
a first chamber 71 for placing a common mode rejection ratio test device;
and a second chamber 72 for holding an electromyographic biofeedback device.
On the basis of the above embodiment, in the present embodiment, the openable and closable shielding box includes a first chamber 71 and a second chamber 72, wherein the first chamber 71 is used for placing the common mode rejection ratio testing device, and the second chamber 72 is used for placing the electromyography biofeedback instrument.
It should be noted that a second slot 77 is arranged between the first chamber 71 and the second chamber 72, and is used for placing a connection line between the common mode rejection ratio testing device and the electromyographic biofeedback instrument; if the electromyographic biofeedback instrument is large in size and cannot be placed in the second chamber 72, and the electromyographic biofeedback instrument is really necessary to be shielded, a user can self make a shielding box with a proper size to shield the electromyographic biofeedback instrument, then a connecting wire between the common mode rejection ratio testing device and the electromyographic biofeedback instrument is connected with the electrode connecting terminal 78 through the first notch 76, a voltage signal output by the common mode rejection ratio testing device is connected to the electrode connecting terminal 78, and the outside of the electrode connecting terminal is connected with an electrode wire for placing the electromyographic biofeedback instrument, so that signal collection is completed.
As a preferred embodiment, further comprising:
an input module 73 connected to the processor 6 for inputting alternating current and attenuated alternating current to the processor 6 for the processor 6 to determine the common mode rejection ratio based on the alternating current and the attenuated alternating current.
The openable and closable shield box further includes an input module 73 connected to the processor 6, and in an actual test, when alternating current and attenuated alternating current are displayed on the electromyographic biofeedback instrument, the worker inputs the alternating current and the attenuated alternating current to the processor 6 through the input module 73, and the processor 6 determines the common mode rejection ratio based on the alternating current and the attenuated alternating current.
It should be noted that the input module 73 is also used for inputting the voltage and frequency required by the alternating current, and after receiving the voltage and frequency required by the alternating current, the processor 6 controls the voltage regulating module 33, the voltage inverting module 4 and the signal attenuation module 5 to perform internal regulation, so as to output an alternating current signal with the required voltage and frequency.
As a preferred embodiment, further comprising:
a display module 74 connected to the processor 6 and to the input module 73 for displaying the common mode rejection ratio determined by the processor 6 based on the alternating current and the attenuated alternating current.
In order to facilitate the reading of the common mode rejection ratio calculated by the processor 6 by the staff, in this embodiment, the openable and closable shield box further includes a display module 74 connected to the processor 6 and the input module 73, and capable of displaying the common mode rejection ratio determined by the processor 6 based on the alternating current and the attenuated alternating current.
Note that the common mode rejection ratio test apparatus typically further includes a prompting apparatus. When the myoelectricity biofeedback instrument is tested, the shielding cover 75 is closed, when the test is finished, the prompting device can give out a buzzing prompt or a voice prompt, and at the moment, a worker opens the shielding cover 75 and observes the alternating current and the attenuated alternating current values displayed on the myoelectricity biofeedback instrument.
Of course, the manner of reminding the worker of the end of the test is not limited to passing through the prompting device, and the application is not limited thereto.
As a preferred embodiment, the input module 73 is a key.
It should be noted that the input module 73 is generally a key, but the input module 73 is not limited to be a key, and the specific arrangement of the input module 73 is not particularly limited herein.
In addition, the openable and closable shield case further includes a ground post 70 through which a wire of the ground line connects a portion to be internally grounded to the ground through the ground post 70, and a charging port 79 through which a charged wire connects a portion to be internally supplied with power to an external power source through the charging port 79.
The utility model also provides a flesh electricity biofeedback appearance system, including flesh electricity biofeedback appearance, still include like foretell common mode rejection ratio testing arrangement.
To the utility model provides a please refer to above-mentioned utility model embodiment for the introduction of a myoelectricity biofeedback appearance system, the utility model discloses no longer give unnecessary details here.
It is to be noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A common mode rejection ratio test apparatus, comprising:
the voltage regulating module is connected with the power supply at the input end and connected with the input end of the voltage inversion module at the output end and is used for regulating the voltage of the direct current provided by the power supply;
the voltage inversion module is connected with the output end of the signal attenuation module and used for obtaining alternating current based on the regulated direct current;
the signal attenuation module is connected with the acquisition end of the electromyographic biofeedback instrument at the output end and is used for attenuating the alternating current output by the voltage inversion module to obtain attenuated alternating current;
and the processor is connected with the electromyographic biofeedback instrument and is used for determining a common-mode rejection ratio based on the alternating current and the attenuated alternating current which are acquired by the electromyographic biofeedback instrument.
2. The common mode rejection ratio testing apparatus of claim 1, wherein said voltage regulating module comprises:
the first switch is connected with the output positive end of the power supply at the first end, connected with the cathode of the follow current module at the second end and connected with the processor at the control end;
the anode of the follow current module is connected with the negative output end of the power supply;
the first inductor is used for reducing the voltage of the direct current, and has a first end connected with the cathode of the follow current module and the second end of the first switch and a second end connected with the first end of the first capacitor;
the second end of the first capacitor is connected with the anode of the follow current module;
the first end with the first end of first electric capacity and the second end of first inductance is connected and is connected the common terminal and conduct the positive end of output, the second end of pressure regulating module with the second end of first electric capacity and the positive pole of afterflow module is connected and is connected the common terminal and conduct the first resistance of the negative end of output of pressure regulating module.
3. The common mode rejection ratio testing apparatus of claim 1, wherein said voltage inverting module comprises:
the first end of the second switch is connected with the output positive end of the voltage regulating module, the second end of the second switch is connected with the first end of the fourth switch, and the control end of the second switch is connected with the processor;
the first end of the third switch is connected with the output positive end of the voltage regulating module and the first end of the second switch, the second end of the third switch is connected with the first end of the fifth switch, and the control end of the third switch is connected with the processor;
the first end of the fourth switch is connected with the second end of the second switch, the second end of the fourth switch is connected with the output negative end of the voltage regulating module, and the control end of the fourth switch is connected with the processor;
a fifth switch, a first end of which is connected with the second end of the third switch, a second end of which is connected with the output negative end of the voltage regulating module and the second end of the fourth switch, and a control end of which is connected with the processor;
the first end of the second resistor is connected with the second end of the second switch and the first end of the fourth switch, and the first end of the second resistor is connected with a common end which is used as an output positive end of the voltage inversion module;
and the second end of the second inductor is connected with the second end of the third switch and the first end of the fifth switch, and a common end of the second inductor is used as the output negative end of the voltage inversion module.
4. The common mode rejection ratio testing apparatus of claim 1, wherein said signal attenuation module comprises:
the first end of the third resistor is used as the input positive end of the signal attenuation module, and the second end of the third resistor is connected with the first end of the fourth resistor;
the second end of the fourth resistor is connected with the first acquisition end of the electromyographic biofeedback instrument;
the third capacitor is connected in parallel to two ends of the fourth resistor;
the first end of the fifth resistor is connected with the second end of the third resistor, and the second end of the fifth resistor is connected with the second acquisition end of the electromyographic biofeedback instrument;
the fourth capacitor is connected in parallel to two ends of the fifth resistor;
the first end of the sixth resistor is connected with the second end of the third resistor, and the second end of the sixth resistor is connected with the third acquisition end of the electromyographic biofeedback instrument;
the fifth capacitor is connected in parallel to two ends of the sixth resistor;
the collection end of the myoelectricity biofeedback instrument comprises the first collection end, the second collection end and the third collection end.
5. The common mode rejection ratio testing apparatus according to claim 1, further comprising:
the openable shielding box is used for placing the common mode rejection ratio testing device and/or the myoelectricity biofeedback instrument.
6. The common mode rejection ratio testing apparatus of claim 5, wherein said openable and closable shield case comprises:
the first chamber is used for placing the common mode rejection ratio testing device;
and the second cavity is used for placing the electromyographic biofeedback instrument.
7. The common mode rejection ratio testing apparatus according to claim 6, further comprising:
an input module coupled to the processor for inputting the alternating current and the attenuated alternating current to the processor for the processor to determine the common mode rejection ratio based on the alternating current and the attenuated alternating current.
8. The common mode rejection ratio testing apparatus according to claim 7, further comprising:
a display module coupled to the processor and the input module for displaying the common mode rejection ratio determined by the processor based on the alternating current and the attenuated alternating current.
9. The device for testing common-mode rejection ratio of claim 7, wherein said input module is a key.
10. An electromyographic biofeedback meter system, comprising an electromyographic biofeedback meter, and further comprising a common mode rejection ratio testing device according to any one of claims 1 to 9.
CN202022559671.5U 2020-11-06 2020-11-06 Common mode rejection ratio testing device and myoelectricity biofeedback instrument system Active CN215227730U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202022559671.5U CN215227730U (en) 2020-11-06 2020-11-06 Common mode rejection ratio testing device and myoelectricity biofeedback instrument system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202022559671.5U CN215227730U (en) 2020-11-06 2020-11-06 Common mode rejection ratio testing device and myoelectricity biofeedback instrument system

Publications (1)

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