Current monitoring control and disturbance current balancing regulation method

Abstract

This invention discloses a current monitoring and control method and an interference current balance adjustment method. In interference electrotherapy mode, two electrode groups need to work together. The system detects the current values ​​of the two electrodes by sampling voltage. When the two current values ​​are detected to be inconsistent, the larger current value is used as a reference, and the current output of the other electrode is adjusted by adjusting a digital potentiometer until it matches the reference level. This invention solves the problem of current intensity imbalance between the two electrodes in interference electrotherapy mode, realizing real-time monitoring and automatic adjustment during interference electrotherapy.

Description

Technical Field

[0001] This invention belongs to the field of current balance regulation technology for electrical stimulation therapy equipment, specifically relating to a current monitoring and control method and a method for regulating interference current balance. Background Technology

[0002] In electrostimulation therapy devices, interferential current therapy modes (including ordinary interferential current and dynamic interferential current) require multiple electrodes to act simultaneously on the skin. Taking a two-channel interferential current therapy mode as an example, the difference in current intensity between the two channels should not be too large (ideally, the current intensities should be the same). For ordinary interferential current mode, if the current intensities of two channels deviate too much, although it still possesses the therapeutic characteristics of interferential current, it will affect the therapeutic effect of both outputs on the body, failing to achieve the expected therapeutic effect within 20 minutes. In dynamic interferential current mode, a large deviation in current intensity between the two channels will affect the effect of the modulated output of the dynamic interferential current itself on the body. Currently, to achieve the balance of interferential current, manual operation of a knob is commonly used. However, due to the different resistance values ​​of different individuals, pre-adjustment is required before treatment. During treatment, the current magnitude may fluctuate slightly, and manual adjustment cannot meet the requirements of real-time monitoring and adjustment, posing difficulties in achieving balance in interferential current therapy modes.

[0003] Therefore, researching current monitoring and control methods and methods for adjusting the balance of interference current under interference mode is urgent and has practical clinical application value. Summary of the Invention

[0004] To address the problem of current intensity imbalance between two or more electrodes under interference electric mode, this invention provides a current monitoring and control method and an interference electric current balance adjustment method, which realizes real-time monitoring and automatic adjustment during interference electric therapy.

[0005] The solution adopted by the present invention to solve its technical problem includes the following steps.

[0006] The first step is to initialize the system.

[0007] The second step is to sample the voltage of the current flowing through the electrode plate of the interference current, and divide the voltage of the sampling point into n equal control levels, where n is an integer greater than 5.

[0008] The third step is to collect the voltage values ​​of the two electrodes respectively, sort and filter the collected n AD voltage values, and obtain the voltage peak value within the n values.

[0009] The fourth step is to match the acquired peak voltage with the pre-defined voltage ranges to determine the voltage display range.

[0010] Fifth, match the corresponding digital tube display value according to the voltage display level.

[0011] Step 6: Current balance adjustment and control. If it is determined to be an interference mode and the potentiometer knob is locked, the two digital tubes (representing the current of the two electrodes respectively) will display the same gear level, and the current gear level value will be saved as the actual gear level intensity value. If the two digital tubes display different gear levels, the electrode output will be balanced, and the larger electrode gear level will be used as the reference gear level. The output of the other electrode level will be adjusted to be equal to the reference gear level.

[0012] In step six, when the program determines whether it is in interference mode, if it is not in interference mode, it continues to judge the range. If it is in interference mode, it judges the locking status of the potentiometer knob. If the potentiometer knob is not locked, it returns to continue judging. If the potentiometer knob is locked, it judges whether the display levels of the two digital tubes are equal. If the display levels of the two digital tubes are equal, it saves the current level value as the actual level intensity value for output. If the display levels of the two digital tubes are not equal, it activates the electrode output balancing processing algorithm, takes the larger electrode level as the reference level, and adjusts the output of the other electrode level to be equal to the set reference level. Finally, it returns to AD sampling and repeats the sorting algorithm.

[0013] The electrostimulation self-controlled reset circuit based on the above method includes a motor potentiometer, a Darlington driver chip U1, and a microcontroller. Pins 7 and 9 of the motor potentiometer are connected to a 5V power supply, pin 10 of the motor potentiometer is connected to pin 18 of the Darlington driver chip U1, pin 3 of the motor potentiometer is grounded, and pin 2 of the motor potentiometer outputs a sampling voltage. This sampling voltage corresponds to the motor rotation angle of the motor potentiometer. The rotation angle of the potentiometer knob is consistent with the rotation angle of the motor. The larger the rotation angle of the potentiometer knob, the larger the corresponding sampling voltage value output by pin 2 of the motor potentiometer. The microcontroller acquires this sampling voltage value through an analog-to-digital converter module and uses it to determine the rotation angle of the motor potentiometer.

[0014] The microcontroller divides the control range based on the maximum rotation angle of the motor potentiometer and establishes a correspondence between the sampled voltage value and the control range division.

[0015] When the microcontroller issues a reset command, pin 1 of U1 outputs a high level. At this time, pin 18 of the corresponding Darlington driver chip U1 outputs a low level, connecting the DC motor of the motor potentiometer to 5V, and the motor starts to rotate. The AD value of the corresponding potentiometer also changes accordingly. The microcontroller monitors the change of the AD value of the potentiometer in real time through pin 2 (AD terminal) of the motor potentiometer. When it rotates to 0, pin 1 of U1 receives a low level from the microcontroller. At this moment, pin 18 of the corresponding Darlington driver chip U1 outputs a high level, preventing the motor from receiving current and stopping the motor from rotating, thus achieving the reset purpose.

[0016] A Zener diode D1 and a capacitor C2 are connected in parallel between the power supply pin 7 and the ground pin 3 of the motor potentiometer. The Zener diode D1 is used to clamp the 3.3V voltage to ensure that the AD acquisition voltage does not exceed 3.3V, thus protecting the microcontroller. The capacitor C2 is used to filter out high frequencies.

[0017] When pin 1 of the Darlington driver chip U1 is high, the motor potentiometer rotates forward; when pin 1 of the Darlington driver chip U1 is low, the motor potentiometer rotates in reverse; pin 2 of the motor potentiometer is the sampling voltage output terminal of the motor potentiometer. When the detected voltage is 0, the motor potentiometer rotates in reverse to reach the reset position, realizing self-controlled reset.

[0018] The beneficial effects of this invention are as follows: This invention features current monitoring and display functions, as well as automatic current balancing and adjustment functions for interference current. It solves the problem of current intensity imbalance between two or more electrodes under interference current mode, achieving real-time monitoring and automatic adjustment during interference current therapy.

[0019] The self-controlled reset circuit for electrical stimulation in this invention solves the problem of potentiometer knobs failing to automatically control after changes in current intensity. The microcontroller controls the forward and reverse rotation of the motor potentiometer by controlling the pin states of the Darlington driver chip. When pin 1 of the Darlington driver chip U1 is high, the motor potentiometer rotates forward; when pin 1 is low, the motor potentiometer rotates in reverse. Pin 2 of the motor potentiometer is the sampling voltage output terminal. When a voltage of 0 is detected, the motor potentiometer reverses to the reset position, achieving self-controlled reset. Since the motor potentiometer can be controlled to rotate forward and reverse according to different trigger signals from the microcontroller, it satisfies the requirement for consistent intensity rotation of the two motor potentiometers under interference or dynamic interference, providing hardware circuit support for balancing the interference current. Attached Figure Description

[0020] Figure 1 This is a control flowchart of the method of the present invention.

[0021] Figure 2This is a schematic diagram illustrating an example of using two interference circuits in this invention.

[0022] Figure 3 This is a schematic diagram of the microcontroller adjusting a digital potentiometer. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and examples.

[0024] Example 1: A current monitoring and control method and interference current balance adjustment method to solve the problem of current intensity imbalance between two or more electrodes under interference mode, realizing real-time monitoring and automatic adjustment during interference therapy.

[0025] The control flow diagram of this adjustment method is as follows: Figure 1 As shown. After the system powers on, it first initializes the ADC module and the digital tube module, dividing the 3.3V voltage into 10 equal voltage levels, with each voltage segment corresponding to a level, numbered 1 to 10. Then, the ADC samples the voltage value, and a bubble sort algorithm is used to calculate the peak value of the 10 consecutive sampled values. The above method is used to collect the voltage values ​​from both electrodes.

[0026] The 10 collected AD voltage values ​​are sorted and filtered, and the peak voltage value within each of the 10 values ​​is obtained. The obtained peak voltage is then matched with the pre-defined voltage range (if it falls within a certain voltage range, the potentiometer is determined to be in that range), and the voltage display range selection is determined.

[0027] Next, the program determines whether it is in interference mode. If it is not in interference mode, it continues range judgment. If it is in interference mode, it checks the potentiometer knob lock status. If the potentiometer knob is not locked, it returns to continue judgment. If the potentiometer knob is locked, it checks whether the displayed ranges on the two digital tubes are equal. If the displayed ranges on the two digital tubes are equal, it saves the current range value as the actual range intensity value for output. If the displayed ranges on the two digital tubes are not equal, it activates the electrode output balancing algorithm (using the larger electrode range as the reference range, adjusting the output of the other electrode range to equal the set reference range), and finally, it returns to AD sampling and repeats the sorting algorithm.

[0028] This method enables automatic adjustment and balance of current intensity between two or more electrodes in the interferential electrotherapy mode, realizing real-time monitoring and automatic adjustment during the interferential electrotherapy process.

[0029] Example 2: Based on Example 1, the electrical stimulation self-controlled reset circuit included in this method, such as... Figure 2As shown, it includes a motor potentiometer, a Darlington driver chip U1, and a microcontroller. This method relies on an electrically stimulated self-reset circuit, and in particular, requires the use of a motor potentiometer.

[0030] Specifically, this circuit uses 16-type motor potentiometers, including R_VR1A and R_VR1C, with U1 being a Darlington driver chip. As shown in the diagram, pins 7 and 9 of the motor potentiometer are connected to a 5V power supply, and pin 10 of the motor potentiometer R_VR1C is connected to pin 18 of the Darlington driver chip U1. Pin 3 of the motor potentiometer R_VR1A is grounded. Pin 2 of the motor potentiometer R_VR1C outputs a sampling voltage, which corresponds to the motor rotation angle of the potentiometer. A Zener diode D1 and a capacitor C2 are connected in parallel between the power supply pin 7 and the ground pin 3 of the motor potentiometer. The Zener diode D1 clamps the voltage to 3.3V, and the capacitor C2 filters out high frequencies.

[0031] Because the knob of the motor potentiometer is mechanically coaxial with the DC motor of the motor potentiometer, the rotation angle of the potentiometer knob is consistent with the rotation angle of the motor. The larger the rotation angle of the potentiometer knob, the larger the sampled voltage value output by pin 2 of the corresponding motor potentiometer R_VR1A. The microcontroller can acquire this sampled voltage value through the analog-to-digital converter module and use it to determine the rotation angle of the motor potentiometer. Based on the maximum rotation angle of the motor potentiometer, control ranges are divided, establishing a correspondence between the sampled voltage value and the control range division, providing a basis for the program to automatically control the motor potentiometer.

[0032] When the microcontroller issues a reset command, pin 1 (opening terminal) of U1 outputs a high level. At this time, pin 18 of the corresponding Darlington driver chip U1 outputs a low level. The DC motor of the motor potentiometer is then connected to 5V and begins to rotate. The AD value of the corresponding potentiometer also changes accordingly. The microcontroller monitors the change in the AD value of the potentiometer in real time through pin 2 (AD terminal) of the motor potentiometer (R_VR1A). When the value rotates to 0, pin 1 (opening terminal) of U1 receives a low level from the microcontroller. At this moment, pin 18 of the corresponding Darlington driver chip U1 outputs a high level, preventing the motor from receiving current and stopping its rotation, thus achieving the reset purpose. Capacitor C1 (220uF) is used to filter out low-frequency ripple generated during motor startup, and C2 filters out high-frequency ripple.

[0033] The above circuit has the following advantages: the microcontroller, motor potentiometer, and Darlington driver chip are all powered by a 5V power supply, ensuring consistent voltage and a simplified circuit structure; the maximum drive current of the Darlington driver chip does not exceed 500mA. Figure 1The circuit shown can realize the accurate forward and reverse rotation control of the motor potentiometer by the microcontroller, meet the automatic control and reset requirements of the knob of the electrical stimulation intensity potentiometer, and also provide hardware circuit support for current balance adjustment in the interference electrotherapy device.

[0034] Example 3: Based on Example 2, such as Figure 3 As shown, Figure 3 This is a simplified control implementation method for the aforementioned hardware circuit. Specifically, the microcontroller controls the forward and reverse rotation of the motor potentiometer by controlling the pin states of the Darlington driver chip. When pin 1 of the Darlington driver chip U1 is high, the motor potentiometer rotates forward; when pin 1 is low, the motor potentiometer rotates in reverse. Pin 2 of the motor potentiometer is the sampling voltage output terminal. When a voltage of 0 is detected, the motor potentiometer reverses to the reset position (the initial position of the motor potentiometer knob), achieving self-controlled reset. Since the motor potentiometer can be controlled to rotate forward and reverse according to different trigger signals from the microcontroller, it satisfies the control requirement of consistent rotation levels of the two motor potentiometers under interference or dynamic interference, providing hardware circuit support for balancing the interference current.

[0035] Example 4: Based on Example 1, the interference circuit control system included in this method mainly solves the problem of accurate control and operation of the interference circuit by the microcontroller. This system includes a power supply, fuse, air pump, solid-state relay, air pump button, solenoid valve drive circuit, air path solenoid valve, intensity adjustment knob, current detection circuit, 8-channel electrode suction cup circuit, 8-channel intensity indicator light, limit switch, capacitor switch, MOSFET, heating wire, temperature sensor, negative pressure sensor, waveform generation circuit, touch screen, speaker, fan, drain solenoid valve, and LED strip. The power supply powers the air pump and drain solenoid valve; the 3.3V power supply powers the microcontroller, LED strip, and limit switch; and the DC power supply powers the silicone heating wire and the operational amplifier and power amplifier chip in the waveform generation circuit. The fuse is connected to the live power line of the interference circuit to prevent short circuits; if a short circuit occurs, the fuse will blow.

[0036] The air pump is connected in series on the fuse output side. The air pump is used to interfere with the negative pressure extraction function of the electrical equipment. Its control is determined by a solid-state relay based on the state of the air pump button. When the air pump button is pressed, the microcontroller detects a high level, triggering the solid-state relay to activate and connect the air pump to the power supply. A solenoid valve is connected to the air pump's extraction end air path to control the negative pressure within each electrode suction cup. This control is achieved by the microcontroller through a solenoid valve drive circuit.

[0037] The intensity adjustment knob, employing a motor potentiometer, is a controllable knob used to adjust the current intensity applied to the human body. When the current intensity is too high, the microcontroller can automatically adjust according to the program. Besides adjusting the intensity of a single current channel, the motor potentiometer can also combine two or more channels to balance the current of interfering currents (ensuring that the current magnitudes of each channel remain consistent). The current detection circuit detects the current applied to the human body through a sampling resistor, providing control feedback signals for adjusting the motor potentiometer. The intensity indicator light indicates the knob's switching state, with brightness corresponding to different resistance values ​​of the motor potentiometer.

[0038] The limit switch is used to determine whether the heating plate is withdrawn. If withdrawn, power is supplied to the capacitor circuit (the touch switch uses a single-channel self-calibrating capacitive touch sensor chip U1, with TOUCH_PAC connected to the capacitor plate, i.e., capacitor C3 is connected between TOUCH_PAC and GND, and capacitor C3 forms a parallel capacitor with the touch capacitor plate to adjust the sensitivity of the touch button). When the capacitor switch is pressed, heating begins; if pushed in, the capacitor power supply is cut off. The capacitor detection circuit uses a detection chip with a mode selection function, which can invert the state of each touch to change the level input of the microcontroller. When the microcontroller determines that it is a heating touch command (high level), the microcontroller drives the MOSFET to connect the external DC power supply. The DC power supply powers the silicone heating wire to start heating. The silicone heating wire is equipped with an automatic temperature control switch. If the temperature exceeds 50 degrees Celsius, the power supply is automatically cut off.

[0039] Based on the above system configuration, the interference circuit control system of this embodiment has the advantages of clear control logic, high execution efficiency, and multiple protection channels.

[0040] Example 5: A current monitoring and control method and interference current balance adjustment method, comprising the following steps.

[0041] The first step is to initialize the system.

[0042] The second step is to sample the voltage of the current flowing through the electrode plate of the interference current and divide the voltage of the sampling point into 10 equal control levels.

[0043] The third step is to collect the voltage values ​​of the two electrodes, sort and filter the 10 collected AD voltage values, and obtain the voltage peak value within the 10 values.

[0044] The fourth step is to match the acquired peak voltage with the pre-defined voltage ranges to determine the voltage display range.

[0045] Fifth, match the corresponding digital tube display value according to the voltage display level;

[0046] Step 6: Current balance adjustment and control. If the circuit is determined to be in interference mode and the knob is locked, the two digital displays (representing the current of the two electrodes respectively) will show equal levels, and the current level value will be saved as the actual level intensity value. If the two digital displays show unequal levels, the electrode output will be balanced, and the higher electrode level will be used as the reference level. The output of the other electrode will be adjusted to equalize the reference level.

[0047] The method in this embodiment has current monitoring and display functions and automatic current balancing adjustment functions for interference current.

[0048] Example 6: Based on the above examples, in the interferential electrotherapy mode, a type of dual-electrode device is used, such as... Figure 2 As shown (taking two interference currents as an example, 1 and 2 form one group of electrodes; 3 and 4 form another group of electrodes), the two electrode groups need to work together. The system detects the current values ​​of the two electrodes by sampling the voltage. When the detected current values ​​are inconsistent, the larger current value is used as the reference. Figure 3 The output current of the other electrode is adjusted by adjusting the digital potentiometer until it matches the reference setting.

[0049] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of the present invention and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of the present invention should be included within the protection scope of the present invention.

Claims

1. A current monitoring, control, and interference current balance adjustment system, comprising a microcontroller, an ADC module, a digital tube module, a motor potentiometer, a Darlington driver chip, a digital potentiometer, a sampling resistor, and a current detection circuit, characterized in that, The regulating system performs the following steps during operation: The first step is to initialize the system; The second step is to sample the voltage of the current flowing through the electrode plate of the interference current through the sampling resistor, and divide the sampled voltage into n equal voltage levels, where n is an integer greater than 5. The third step is to collect the sampling voltage values ​​of the two electrodes respectively, and to sort and filter the m AD voltage values ​​collected from each channel using the bubble sort algorithm, and extract the voltage peak value within the m samples. The fourth step is to match the acquired peak voltage with the pre-defined voltage ranges to determine the voltage display range. The matching rule is: if the peak voltage falls within a certain preset voltage range, the digital potentiometer is determined to be in the corresponding range. The fifth step is to match the corresponding digital tube display value according to the voltage display level, and display the current intensity level of the two electrodes in real time through the digital tube module; Step 6, Current Balance Adjustment and Control: If the program determines that it is in interference electrotherapy mode, it checks the locking status of the motor potentiometer knob. If the motor potentiometer knob is not locked, it returns to continue the judgment. If the motor potentiometer knob is locked, it checks the display settings of the two digital tubes representing the current of the two electrodes respectively. (1) If the two digital tubes display the same gear, save the current gear value as the actual gear intensity value and output it; (2) If the display levels of the two digital tubes are not equal, the electrode output balancing processing algorithm is activated, and the larger electrode level is used as the reference level. The current output of the other electrode is controlled by adjusting the digital potentiometer until its level is consistent with the reference level.

2. The regulating system according to claim 1, characterized in that, In step six, when the program determines whether it is in interference mode, if it is not in interference mode, it returns to the determination. After completing step six, it returns to step two to repeat voltage sampling and sorting filtering, so as to realize real-time monitoring and automatic balancing of current during interference therapy.

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