CN114099950A - Electrode sucker breath massage type control method - Google Patents
Electrode sucker breath massage type control method Download PDFInfo
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- A61N1/00—Electrotherapy; Circuits therefor
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- A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
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- A61H2201/00—Characteristics of apparatus not provided for in the preceding codes
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- A61H2201/00—Characteristics of apparatus not provided for in the preceding codes
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Abstract
The invention discloses a breath massage type control method of an electrode sucker, which comprises the steps of initializing a microcontroller and a screen, starting pressure value and mode setting, then selecting a mode, then carrying out adsorption pressure detection, starting an air pump, carrying out air pressure sensor detection, and carrying out pressure regulation according to a set mode in a continuous, intermittent, frequency conversion, density or alternative mode on the premise of preventing the electrode sucker from being adsorbed and falling off; the pressure regulation is carried out according to the amplitude of half wave, square wave, triangular wave, exponential wave, sawtooth wave or sharp wave, and the like, and if the air pump is judged to be closed, the treatment is ended. The method takes a microcontroller as a core, takes the output of an air pressure sensor as a feedback signal, and realizes the accurate control of the air pump in a PWM control mode, thereby ensuring that the negative pressure in the electrode sucker changes according to a set mode.
Description
Technical Field
The invention belongs to the technical field of electrode sucker control of an electrical stimulation therapeutic apparatus, and particularly relates to a breath massage type control method of an electrode sucker.
Background
In the use process of the electrical stimulation therapeutic apparatus such as medium frequency, low frequency, interference electricity and the like, the electrode sucker acts on human body current through the electrode in the sucker to realize the electrotherapy rehabilitation effect on patients, and the sucker type structure can also realize the massage function of the sucker through a control method by utilizing the difference of negative pressure in the sucker. At present, an electrode sucker of electrical stimulation treatment equipment generally has only an electrotherapy effect but no breathing type massage effect, and cannot meet the synchronous massage function in the electrical stimulation treatment process. Therefore, the negative pressure extraction method of the electrode sucker with the breathing massage function is an effective method for solving the above requirements.
Disclosure of Invention
The invention provides an electrode sucker breath massage type control method, which aims at solving the technical problem of realizing air pressure massage by utilizing a sucker in the electrical stimulation treatment process.
The technical scheme adopted by the invention for solving the technical problems is as follows: an electrode sucker breath massage type control method comprises the following steps.
In the first step, a microcontroller and a screen are initialized.
Second, pressure value and mode setting are started.
And thirdly, selecting a mode.
Fourthly, detecting the adsorption pressure, starting an air pump, detecting an air pressure sensor, and adjusting the pressure according to a set mode of continuous, intermittent, frequency conversion, density or alternative mode on the premise that the electrode sucker is prevented from being adsorbed and falling off and the current pressure value cannot be less than a preset pressure value K%; the pressure regulation is carried out according to the amplitude of half wave, square wave, triangular wave, exponential wave, sawtooth wave or sharp wave.
And fifthly, if the air pump is judged to be closed, the treatment is finished.
In the fourth step, the negative pressure in the electrode sucker is controlled by adopting a mode adjusting mode and a pressure value adjusting mode together, wherein the mode adjusting mode comprises a continuous mode, an intermittent mode, a frequency conversion mode, a density adjusting mode or an alternate mode; the pressure value adjusting mode comprises a half wave, a square wave, a triangular wave, an exponential wave, a sawtooth wave or a sharp wave; selecting a mode adjusting mode and a pressure value adjusting mode in the treatment process; under each mode adjusting mode, selecting a pressure value adjusting mode, namely selecting one or more combinations from half-wave, square wave, triangular wave, exponential wave, sawtooth wave, sharp wave and the like as a pressure change rule; the negative pressure in the electrode sucker periodically changes according to half-wave, square-wave, triangular-wave, exponential wave, sawtooth wave or spike wave, and the amplitude of the half-wave, square-wave, triangular-wave, exponential wave, sawtooth wave or spike wave is adjustable.
The method also comprises a microcontroller, a touch screen, a PWM (pulse-width modulation) driving circuit, an air pump, an air interchanger, an electrode sucker and an electromagnetic valve, wherein the microcontroller and the touch screen are connected by adopting serial communication, and the touch screen sends set parameters to the microcontroller and receives prompt and alarm information sent by the microcontroller; the pressure sensor, the electromagnetic valve, the electrode sucker and the air pump are communicated with the air interchanger through air pipes; the micro-controller controls the air pump according to a breath massage control algorithm, and through earlier experiments, the electrode sucker cannot fall off in the treatment process under the condition that the negative pressure of the electrode sucker is-K1, and the-K1 is used as an air pump control threshold which is higher than a falling critical threshold of-K2.
The breathing massage control algorithm in the method has 4 working modes, wherein the first mode is an air pressure-free switching mode (without massage effect), the second mode is switching for m times per minute, and the third mode is switching for n times per minute. Here, m times per minute, that is, m times per minute, the switching time of the controller is t1 seconds each time. Here, the air pressure control switching is performed n times per minute, that is, n times per minute, and each controller switching time is t2 seconds. The fourth mode is a hybrid air pressure switching mode, air pressure switching (for example, the first and the second are alternately switched, and the switching can be set through touch screen parameter setting). In order to ensure the accuracy of air pump control, the microcontroller adopts PWM control.
The method is performed as follows. Firstly, carrying out system initialization on the micro control and the touch screen. And secondly, setting pressure values and modes, wherein the pressure values comprise default air pump pressure threshold values and switching threshold values, the mode is selected from any one of the modes in the 4, and then the air pump is started to work. And thirdly, executing a corresponding program according to the mode selected in the last step. If the mode 1 is selected, air is pumped according to the set pressure value, and the massage and air pressure switching effects are not generated. If the air pump is not started, the program control is finished. If the mode 2, the mode 3 and the mode 4 are selected, the timer is controlled to carry out timing operation according to the requirements of each mode. And fourthly, judging whether the air pump is started or not, starting the air pressure to detect in real time if the air pump is started, and finishing the program control if the air pump is not started. When the actual measurement atmospheric pressure value is equal to preset atmospheric pressure value, stop to bleed, if the current pressure value equals about 60% of preset pressure value, then keep current pressure value to bleed, when reaching single bleed time, then return and bleed (100%) with preset pressure value, so circulate. And if the current pressure value is not equal to about 60% of the preset pressure value, returning to continuously execute the customized air extraction instruction (stopping the PWM drive). And when the actually measured air pressure value is not equal to the preset air pressure value, continuing air pressure detection until the actually measured air pressure value is equal to the preset air pressure value.
And (5) self-defining a mode. The switched air pump pressure may be set manually, by default to-K4. Through test, the negative pressure in the electrode sucker is not lower than-K3, K3 is more than K4 is more than K1 is more than K2. In the default mode, the negative pressure change in the three switching electrode chucks is switched between-K1 and-K4. In a self-defined mode, the default threshold value can be modified through the touch screen, the negative pressure is changed to be-K1 after modification, the air pressure is switched between the new set air pressure value, and the therapeutic patient is provided with respiratory massage feeling through air pressure change to assist electrical stimulation therapy.
The air pump negative pressure detection circuit comprises a negative pressure sensor, an operational amplification circuit, a low-pass filter circuit and a voltage follower which are sequentially connected, and the output end of the voltage follower is connected with the signal input end of the controller after voltage division; the air pump electromagnetic valve driving circuit comprises a driving module, a silicon controlled rectifier set, an air pump set and an electromagnetic valve set, wherein the multi-path output signal output end of the controller is connected with each signal input end of the driving module through a corresponding current limiting resistor, and the multi-path signal output end of the driving module is connected with the control end of a corresponding air pump and an electromagnetic valve through a silicon controlled rectifier.
The air pump voltage zero-crossing detection circuit comprises a JP connector, a capacitor CX1, a first piezoresistor, a current-limiting resistor RX and an optocoupler, wherein the JP connector is connected with alternating current, the CX1 capacitor connected to two ends of the alternating current is used for eliminating differential mode interference, the piezoresistor connected to two ends of the alternating current is used for eliminating peak high voltage, the current-limiting resistor RX connected to the primary input end of the TLP62 in series is used for reducing the power consumption of a single electrical component and reducing the heat productivity, the alternating current divided by the current-limiting resistor RX passes through the optocoupler, the primary side of the optocoupler is a bidirectional diode, and when the sine voltage waveform passing through the bidirectional diode is near a defined zero-crossing point at the moment, if the voltage is lower than the on voltage of the optocoupler, the secondary side of the optocoupler is not conducted, and the output is 5V; when the voltage is high and the optocoupler conduction voltage, the optocoupler secondary is conducted and outputs 0V, when a voltage sine signal zero crossing point is detected, the optocoupler sends a control signal to the controller to trigger and send a PWM waveform, so that the stability of the PWM waveform output by the singlechip after the zero crossing point at each time is ensured, and the purpose of controlling the stability of the negative pressure of the air pump is achieved.
The electrode falling protection circuit comprises an alternating current transformer, an electrode, a mutual inductor, a sampling resistor, a precise full-wave rectification amplifying circuit, a four-order filter circuit, a current sampling clamping circuit and a microcontroller, wherein the alternating current transformer boosts a synthetic sine wave signal which is generated at the front end of the electrical stimulation treatment equipment and is subjected to modulation and carrier wave to convert the synthetic sine wave signal into single-phase alternating current with the same frequency, a DJ +, DJ-external treatment electrode is output at the secondary side of the transformer, the electrode acts on a human body through an electrode sucker, the mutual inductor is used for inducing the alternating current signal which acts on the human body and converting the alternating current signal into an alternating voltage signal (the amplitude is about 0.5V) through the sampling resistor, the precise full-wave rectification amplifying circuit rectifies and amplifies the alternating voltage signal which is converted after being output by the mutual inductor, and then the rectified and amplified voltage signal is filtered by the four-order filter circuit, and the clamping circuit ensures that the output value is less than 3.3V, the final output value Current _1 is output to an ADC module of the microcontroller, and the microcontroller is used for detecting the Current.
If no Current flows between DJ + and DJ-due to electrode drop, the output value Current _1 is 0V, the microcontroller can acquire 0V voltage through the detection of the ADC module, namely the electrode drop is judged, and the microcontroller triggers an alarm. The electrode falling detection circuit is directly used by a controller for 3.3VADC detection. The sampling resistor comprises a fixed value resistor and an adjustable resistor which are connected in series, and the adjustable resistor is used for adjusting the amplitude of the whole circuit so as to reduce or eliminate baseline interference caused by the transformation ratio error of the voltage transformer or the transformer.
The invention has the beneficial effects that: the method takes a microcontroller as a core, negative feedback is constructed by an air pressure sensor, accurate control of the air pump is realized in a PWM control mode, and regular fluctuation of negative pressure in the electrode sucker is guaranteed.
Drawings
Fig. 1 is a block diagram of an electrode chuck breath massage control.
Fig. 2 is a control flow diagram of the present invention.
Fig. 3 is an electrode fall-off detection circuit.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
Example 1: an electrode sucker breath massage type control method realizes air pressure massage formed by a sucker in the process of electrical stimulation treatment, so as to solve the current situation of missing air pressure massage in the process of electrical stimulation treatment and solve the technical problem that common air pressure massage is difficult to realize.
The control block diagram of the method is shown in figure 1. In fig. 1, the front represents electrical connections and the line without arrows represents pneumatic connections. The microcontroller is connected with the touch screen in a serial communication mode, the touch screen sends set parameters (treatment time and treatment mode) to the microcontroller and receives prompt and alarm information sent by the microcontroller (the prompt information has treatment ending sound, and the alarm information has electrode falling).
The pressure sensor, the electromagnetic valve, the electrode sucker and the air pump are communicated with the air interchanger through air pipes. The microcontroller starts the air pump to close the electromagnetic valve, stops the air pump to work to open the electromagnetic valve, and discharges the surplus water pumped from the electrode sucker in the air interchanger to the water supply and drainage box (after the system is started, the electromagnetic valve is firstly switched on for a set time to discharge the water in the air interchanger to the water drainage box, and then the electromagnetic valve is closed). The electrode sucker is connected with an air pump through an air pipe, the electromagnetic valve is located on the air pipe, the electrode is located in the electrode sucker, the electrode signal wire penetrates through the air pipe, one end of the electrode signal wire is connected with the electrode, the other end of the electrode signal wire is connected with the microcontroller, the electrode acts on a human body through the electrode sucker to perform electrical stimulation treatment, the pressure sensor is located in the electrode sucker, and the air pump is controlled by the microcontroller.
The microcontroller transmits the pressure in the electrode sucker to the microcontroller in real time through the pressure sensor, and the microcontroller controls the air pump according to the breathing massage control algorithm. Through earlier experiments, the electrode sucker cannot fall off in the treatment process under the condition that the negative pressure is-6 Kpa, and the-6 Kpa is used as an air pump control threshold which is higher than a critical threshold of falling off (-4.7 Kpa). In order to ensure the accuracy of air pump control, PWM control is adopted.
The breathing massage control algorithm in the method has 4 working modes, wherein the first mode is an air pressure-free switching mode (without massage effect), the second mode is switching for 15 times per minute, and the third mode is switching for 30 times per minute. Here, the air pressure control was switched 15 times per minute, that is, 15 times per minute, and the controller was switched for 4 seconds each time. Here, the air pressure control is switched 30 times per minute, that is, 30 times per minute, and each controller is switched to 2 seconds. The fourth mode is a hybrid air pressure switching mode, air pressure switching (for example, the first and the second are alternately switched, and the switching can be set through touch screen parameter setting).
And (5) self-defining a mode. The switched air pump pressure may be set manually, by default to 10 kpa. Through experimental tests, the negative pressure in the electrode sucker is not lower than-22 kpa. In the default mode, the negative pressure change in the three switching electrode chucks is switched between-6 kpa and-10 kpa. In the user-defined mode, the default threshold value can be modified through the touch screen, the negative pressure is changed to be-6 kpa after modification, the air pressure is switched between a new set air pressure value, and the therapeutic patient is massaged in a breathing mode through the change of the air pressure to assist electrical stimulation therapy.
According to the method, the microcontroller is used as a core, negative feedback is constructed by the air pressure sensor, accurate control of the air pump is realized in a PWM control mode, and regular fluctuation of negative pressure in the electrode sucker is guaranteed.
Example 2: on the basis of example 1, the method is carried out as follows, see fig. 2.
Firstly, carrying out system initialization on the micro control and the touch screen.
And secondly, setting pressure values and modes, wherein the pressure values comprise default air pump pressure threshold values and switching threshold values, the mode is selected from any one of the modes in the 4, and then the air pump is started to work.
And thirdly, executing a corresponding program according to the mode selected in the last step. If the mode 1 is selected, air is pumped according to the set pressure value, and the massage and air pressure switching effects are not generated. If the air pump is not started, the program control is finished. If the mode 2, the mode 3 and the mode 4 are selected, the timer is controlled to carry out timing operation according to the requirements of each mode.
And fourthly, judging whether the air pump is started or not, starting the air pressure to detect in real time if the air pump is started, and finishing the program control if the air pump is not started. When the actual measurement air pressure value is equal to the preset air pressure value, stopping air extraction, if the current pressure value is equal to 60% of the preset pressure value, keeping the current pressure value to extract air, and returning to extract air (100%) with the preset pressure value when single air extraction time is reached, so that the process is circulated. And if the current pressure value is not equal to 60 percent (50 to 70 percent) of the preset pressure value, returning to continuously execute the customized air extraction instruction (stopping the PWM drive). And when the actually measured air pressure value is not equal to the preset air pressure value, continuing air pressure detection until the actually measured air pressure value is equal to the preset air pressure value.
Example 3: on the basis of the embodiment 1, an electrode falling protection circuit is further adopted, the protection circuit is mainly used for monitoring the problem that the electrode is easy to fall off in the negative pressure change process in real time, and hardware support is provided for constructing closed-loop control of the microcontroller and realizing dynamic monitoring of the electrical stimulation treatment process through the electrode falling detection and protection circuit.
The electrode falling detection circuit is a precondition for electrode falling protection. The core of the electrode falling detection circuit is to detect the electrode current. As shown in fig. 3, the electrode falling detection circuit mentioned in this embodiment includes an ac transformer 1, an electrode 2, a transformer 3, a sampling resistor 4, a precise full-wave rectification amplifier circuit 5, a fourth-order filter circuit 6, and a current sampling clamp circuit 7. The resistance and capacitance values of the parts of the electrode falling detection circuit are shown in fig. 1. The alternating current transformer 1 is a synthesized sine wave of modulation and carrier wave generated at the front end of the electrical stimulation treatment equipment, the base line of the sine wave is 0, the sine wave has positive half cycle and negative half cycle waveforms, the signal is boosted by the single-phase alternating current transformer and then converted into single-phase alternating current with the same frequency of about 50V, DJ +, DJ-external treatment electrodes are output at the secondary side of the transformer, and the electrodes act on a human body through an electrode sucker to perform electrical stimulation treatment.
The mutual inductor 3 is used for inducing an alternating current signal acting on a human body and converting the alternating current signal into an alternating voltage signal (the amplitude is about 0.5V) through the sampling resistor 4. Because the alternating voltage signal is weak, the rectification and filtering processing can not be carried out by adopting a common rectification method. The precise rectifying and amplifying circuit constructed by the operational amplifier rectifies and amplifies the voltage signal converted after the output of the mutual inductor, and the amplification factor is 5 times. And then, filtering is carried out on the rectified and amplified 5 times by adopting a four-stage filter circuit 6, the output value is ensured to be less than 3.3V by a clamping circuit 7, the final output value Current _1 is output to an ADC (analog to digital converter) module of the microcontroller, Current detection is carried out by the microcontroller, and electrode falling protection is realized.
The principle of electrode falling protection is as follows: if no Current flows between DJ + and DJ-when the electrode falls off, the output value Current _1 is 0. As long as 0V is output through the circuit, the microcontroller detects through the ADC module, and then the voltage of 0V can be obtained, namely the electrode falling is judged, and the microcontroller triggers an alarm. The electrode dropout detection circuit described above is suitable for direct use with a controller having a 3.3VADC detection. RP2 in sampling resistor 4 is an adjustable resistor used for baseline adjustment of the whole circuit to cause baseline interference due to the transformation ratio error of the voltage transformer or transformer. The electrode sucker state real-time monitoring in the treatment process can be realized, the treatment current can be changed and extracted, and the problems that the excessive current flows through the human body in the treatment process, and the electric injury is caused to a patient to be treated are avoided.
Example 4: an electrode sucker breath massage type control method.
In the first step, a microcontroller and a screen are initialized.
Second, pressure value and mode setting are started.
And thirdly, selecting a mode.
Fourthly, detecting the adsorption pressure, starting an air pump, detecting an air pressure sensor, and adjusting the pressure according to a set mode (a continuous mode, an intermittent mode, a frequency conversion mode, a density mode or an alternate mode) on the premise of preventing the electrode sucker from being adsorbed and falling off (the current pressure value cannot be less than 60% of a preset pressure value); the pressure regulation is carried out according to the amplitude of half wave, square wave, triangular wave, exponential wave, sawtooth wave or sharp wave.
And fifthly, if the air pump is judged to be closed, the treatment is finished.
In the method, a mode adjusting mode and a pressure value adjusting mode are adopted to jointly control the negative pressure in the electrode sucker; the mode adjusting mode comprises a continuous mode, an intermittent mode, a frequency conversion mode, a density mode or an alternate mode and the like; the pressure value adjusting mode comprises a half wave, a square wave, a triangular wave, an exponential wave, a sawtooth wave or a sharp wave and the like. And selecting a mode adjusting mode and a pressure value adjusting mode in the treatment process.
Under each mode adjusting mode, selecting a pressure value adjusting mode, namely selecting one or more combinations from half-wave, square wave, triangular wave, exponential wave, sawtooth wave, sharp wave and the like as a pressure change rule; the negative pressure in the electrode sucker can periodically change according to half-wave, square-wave, triangular-wave, exponential wave, sawtooth wave, sharp wave and the like, and the amplitude of the half-wave, square-wave, triangular-wave, exponential wave, sawtooth wave, sharp wave and the like can be adjusted.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like which are made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention, for example, an air pump pressure adjusting circuit may be further included, which mainly improves the problems of inaccurate air pump pressure control, lack of real-time detection, high power consumption and the like existing in the air pump pressure control used in the existing electrical stimulation therapy, so as to solve the problem that the experience of the common electrical stimulation therapy apparatus for treating patients in the negative pressure feeling aspect is not good. The adjusting circuit mainly comprises an air pump negative pressure detecting circuit, an air pump voltage zero crossing point detecting circuit and an air pump electromagnetic valve driving circuit, the problem of accurate and stable control of air pump negative pressure extraction is solved through the air pump pressure adjusting circuit, and a trigger level signal is provided for a single chip microcomputer to accurately set off PWM.
Claims (8)
1. An electrode sucker breath massage type control method is characterized by comprising the following steps:
firstly, initializing a microcontroller and a screen;
secondly, starting pressure value and mode setting;
thirdly, selecting a mode;
fourthly, detecting the adsorption pressure, starting an air pump, detecting an air pressure sensor, and adjusting the pressure according to a set mode of continuous, intermittent, frequency conversion, density or alternative mode on the premise that the electrode sucker is prevented from being adsorbed and falling off and the current pressure value cannot be less than a preset pressure value K%; the pressure regulation is carried out according to the amplitude of half-wave, square wave, triangular wave, exponential wave, sawtooth wave or sharp wave;
and fifthly, if the air pump is judged to be closed, the treatment is finished.
2. The electrode sucker breath massage type control method according to claim 1, wherein the negative pressure in the electrode sucker is controlled by a mode adjustment mode and a pressure value adjustment mode, wherein the mode adjustment mode comprises a continuous mode, an intermittent mode, a variable frequency mode, a density mode or an alternate mode; the pressure value adjusting mode comprises a half wave, a square wave, a triangular wave, an exponential wave, a sawtooth wave or a sharp wave; selecting a mode adjusting mode and a pressure value adjusting mode in the treatment process; under each mode adjusting mode, selecting a pressure value adjusting mode, namely selecting one or more combinations from half-wave, square wave, triangular wave, exponential wave, sawtooth wave, sharp wave and the like as a pressure change rule; the negative pressure in the electrode sucker periodically changes according to half-wave, square-wave, triangular-wave, exponential wave, sawtooth wave or spike wave, and the amplitude of the half-wave, square-wave, triangular-wave, exponential wave, sawtooth wave or spike wave is adjustable.
3. The electrode sucker breath massage type control method according to claim 1, further comprising a microcontroller, a touch screen, a PWM driving circuit, an air pump, an air interchanger, an electrode sucker and an electromagnetic valve, wherein the microcontroller and the touch screen are connected by serial communication, and the touch screen sends setting parameters to the microcontroller and receives prompt and alarm information sent by the microcontroller; the pressure sensor, the electromagnetic valve, the electrode sucker and the air pump are communicated with the air interchanger through air pipes; the micro-controller controls the air pump according to a breath massage control algorithm, and through earlier experiments, the electrode sucker cannot fall off in the treatment process under the condition that the negative pressure of the electrode sucker is-K1, and the-K1 is used as an air pump control threshold which is higher than a falling critical threshold of-K2.
4. The electrode chuck breath massage control method of claim 1, wherein the breath massage control algorithm has 4 operating modes, a first mode of no-pressure switching, a second mode of m-times per minute switching, and a third mode of n-times per minute switching, wherein m-times per minute switching is performed, wherein each time the controller is switched for t1 seconds, wherein n-times per minute switching is performed, wherein each time the controller is switched for t2 seconds, and wherein the fourth mode is a mixed pressure switching mode, wherein the pressure switching is performed.
5. The electrode sucker breath massage type control method as claimed in claim 1, further comprising a self-defined mode, wherein the switched air pump pressure is manually set, the default setting is-K4, the negative pressure in the electrode sucker is not lower than-K3, K3 > K4 > K1 > K2, in the default mode, the change of the negative pressure in the three switched electrode suckers is switched between-K1 and-K4, in the self-defined mode, the default threshold value can be modified through the touch screen, after modification, the negative pressure is changed to be switched between-K1 and a new set air pressure value, and the change of the air pressure gives the treated patient a breath massage feeling to assist the electrical stimulation treatment.
6. The electrode chuck breath massage control method of claim 1, wherein the microcontroller employs PWM control.
7. The electrode sucker breath massage type control method according to claim 1, further comprising an air pump pressure regulating circuit comprising an air pump negative pressure detection circuit and an air pump solenoid valve driving circuit, wherein the air pump negative pressure detection circuit comprises a negative pressure sensor, an operational amplification circuit, a low-pass filter circuit and a voltage follower which are connected in sequence, and an output end of the voltage follower is connected with a signal input end of the controller after voltage division; the air pump electromagnetic valve driving circuit comprises a driving module, a silicon controlled rectifier set, an air pump set and an electromagnetic valve set, wherein the multi-path output signal output end of the controller is connected with each signal input end of the driving module through a corresponding current limiting resistor, and the multi-path signal output end of the driving module is connected with the control end of a corresponding air pump and an electromagnetic valve through a silicon controlled rectifier.
8. The electrode sucker breath massage control method of claim 1, wherein after the system is powered on, the solenoid valve is first turned on for a set time to drain water from the ventilator to the drain box and then turned off.
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| CN117233666A (en) * | 2023-09-20 | 2023-12-15 | 哈尔滨工业大学 | Ferroelectric material testing system and testing method thereof |
| CN117233666B (en) * | 2023-09-20 | 2024-05-03 | 哈尔滨工业大学 | Ferroelectric material testing system and testing method thereof |
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