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Air pump pressure adjusting method

A technology of pressure regulation and air pump, applied in pump control, electrotherapy, liquid variable capacity machinery, etc., can solve problems such as unstable air pump control

Pending Publication Date: 2021-12-31
河南百昌源医疗科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem of instability of air pump control caused by time delay in traditional air pump control in the way of zero-crossing detection trigger interruption, the present invention provides an air pump pressure adjustment method to solve this problem

Method used

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Experimental program
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Effect test

Embodiment 1

[0022] Embodiment 1: A method for adjusting the pressure of an air pump, which is used to solve the problem of unstable air pump control caused by the time delay in the zero-crossing detection trigger interruption mode in traditional air pump control. Such as figure 1 As shown, this method takes the microcontroller as the control core, and obtains the single-pulse trigger control signal of the microcontroller by detecting the zero-crossing point of the voltage waveform of the air pump power supply, and controls the AC negative pressure pump by adjusting the duty cycle of the single pulse to realize the control of the negative pressure pump. Extraction of negative pressure in the electrode suction cup. Use the pressure sensor to obtain the negative pressure value of the air pump, and compare it with the preset threshold value set in the microcontroller. Once the pressure sensor value is inconsistent with the set threshold value, adjust the single pulse duty cycle to realize the...

Embodiment 2

[0026] Embodiment 2: On the basis of Embodiment 1, an air pump pressure regulation circuit is adopted. This circuit is mainly improved for the problems of inaccurate air pump pressure control, lack of real-time detection, and high power consumption in the existing air pump pressure control used in electrical stimulation therapy. , to solve the problem of poor experience for patients treated by ordinary electrical stimulation therapy instruments in terms of negative pressure perception.

[0027] The regulating circuit mainly includes an air pump negative pressure detection circuit, an air pump voltage zero-crossing detection circuit and an air pump electromagnetic valve drive circuit.

[0028] Specifically, the air pump negative pressure detection circuit such as image 3As shown, U4 in the figure is a negative pressure sensor, which outputs different differential mode signals when the negative pressure changes, and the amplitude is very small, only in the millivolt level. Cap...

Embodiment 3

[0032] Embodiment 3: On the basis of Embodiment 1, an air pump pressure regulation circuit is adopted, including an air pump negative pressure detection circuit, an air pump voltage zero-crossing detection circuit and an air pump solenoid valve drive circuit.

[0033] Such as image 3 As shown, the air pump negative pressure detection circuit includes a negative pressure sensor, an operational amplifier circuit, a low-pass filter circuit and a voltage follower connected in sequence, and the output terminal of the voltage follower is divided and connected to the signal input terminal of the controller.

[0034] Among them, the operational amplifier circuit is a three-op-amp instrumentation operational amplifier circuit composed of three operational amplifiers U3A, U3B and U3C, in which the resistor R15 is connected in series between the inverting input terminals of the operational amplifier U3A and U3B, and the inverting input terminal of the operational amplifier U3A Connect t...

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Abstract

The invention discloses an air pump pressure adjusting method which takes a microcontroller as the control core, obtains a microcontroller monopulse trigger control signal by detecting the voltage waveform zero crossing point of an air pump power source, controls an alternating current negative pressure pump by adjusting the duty ratio of monopulse, and realizes the adjustment of the pressure of the interior of an electrode suction cup. The negative pressure value of an air pump is acquired by acquiring a pressure sensor and is compared with an initial threshold value set in a microcontroller, and once the value of the pressure sensor is inconsistent with the set threshold value, a pressure adjusting increasing or decreasing strategy is adopted, so that accurate control of the alternating current negative pressure pump is realized. The problem of accurate and stable control over negative pressure extraction of the air pump can be solved, and pressure feedback detection is achieved through the air pressure sensor. And zero crossing point detection is adopted, so that the influence of power supply voltage fluctuation on the alternating current air pump is avoided, and a trigger level signal is provided for a single chip microcomputer to accurately send out PWM. And the zero point detection and air pressure sensor dual-detection control method is formed.

Description

technical field [0001] The invention belongs to the technical field of regulating circuits of electric stimulation therapeutic instruments such as intermediate frequency and low frequency, and in particular relates to a method for regulating the pressure of an air pump. Background technique [0002] During the use of medium-frequency, low-frequency and other electrical stimulation therapeutic instruments, suction cups or suction bowls are needed to fix the electrode sheets on the human skin, so an air pump is needed to draw negative pressure on the suction cups or suction bowls to ensure that the electrode suction cups or suction cups are in the process of treatment. The suction cup does not fall off. In addition, the negative pressure in the suction cup or suction bowl determines the comfort of the human body during treatment. Excessive negative pressure in the suction cup will cause skin blisters and capillary rupture, which will affect the experience of using the electric...

Claims

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Application Information

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IPC IPC(8): F04B49/06F04B49/08F04B49/22A61N1/08A61N1/36A61N1/04
CPCF04B49/06F04B49/08F04B49/22A61N1/08A61N1/3603A61N1/0472
Inventor 申思宪俎志勇董俊鹏赵志科吴涛杨亚烁丁鹏元房艳冰程龙可连钊
Owner 河南百昌源医疗科技有限公司