Implementation circuit for realizing intelligent pressure control of massage air bag
By using feedback from air pressure sensors in the massage airbag controller to achieve closed-loop control and using an instrument amplifier composed of dual op amps, the problems of low accuracy and high cost of inflation pressure control in the prior art are solved, and higher control is achieved Accuracy and economical.
Patent Information
- Application Number
- CN202420168052.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-24
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2034-01-24
AI Technical Summary
The existing massage airbag controller adopts open-loop control without feedback, resulting in low control accuracy of inflation pressure. The amplifier circuit generally uses a single op amp differential amplifier or a three op amp instrument amplifier, which has small input impedance or high cost. question.
The feedback from the air pressure sensor is used to achieve closed-loop control of the air pressure, and the differential voltage is amplified through the instrumentation amplifier composed of dual op amps to improve control accuracy and reduce costs.
Closed-loop control is achieved through feedback from the air pressure sensor, which improves the control accuracy of the inflation pressure, and reduces costs through dual op-amp amplifier circuits, with higher input impedance and economicality.
Smart Images
Figure CN222461944U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of massage equipment, in particular to a circuit for realizing intelligent pressure control of a massage air bag. Background Art
[0002] The massage airbag is a device that simulates the palm kneading massage action by inflating and deflating air. Its structure mainly includes an airbag, an air pump, a pipeline and a controller. The controller is the control part of the massage airbag, which is responsible for controlling parameters such as the working time and inflation pressure of the air pump. Through the controller, users can adjust the inflation pressure and massage time of the airbag according to their needs to achieve the best massage effect. However, the existing controller generally adopts open-loop control without feedback, resulting in low control accuracy of the inflation pressure. At the same time, the amplifier circuit part of the existing controller generally adopts a single op amp differential amplifier or a three-op amp instrumentation amplifier. The single op amp differential amplifier has the disadvantage of small input impedance, while the three-op amp instrumentation amplifier has a high cost. Utility Model Content
[0003] The purpose of the utility model is to provide a circuit for realizing intelligent pressure control of a massage airbag, so as to solve the problems raised in the above background technology.
[0004] In order to solve the above technical problems, the utility model provides the following technical solutions: a circuit for realizing intelligent pressure control of a massage airbag, comprising an air pressure sensor Baro, an operational amplifier A and an operational amplifier B, wherein the positive input terminal of the operational amplifier A is connected to Input-, the negative input terminal of the operational amplifier A is connected in series with a resistor R4 and then connected to GND, the output terminal of the operational amplifier A and the negative input terminal are connected in series through a resistor R3, the positive input terminal of the operational amplifier B is connected to Input+, the negative input terminal of the operational amplifier B is connected in parallel with resistors R1, R2 and R5, the other end of the resistor R1 is connected to the output terminal of the operational amplifier A, the other end of the resistor R2 is connected to the output terminal of the operational amplifier B, and the other end of the resistor R5 is connected to the input terminal of the operational amplifier A.
[0005] Preferably, the positive power input terminal of the operational amplifier A is connected to VCC, and the negative power input terminal is connected to GND.
[0006] Preferably, the resistance values of the resistors R1, R2, R3 and R4 are all 24 kΩ.
[0007] Preferably, the resistance of the resistor R5 is 1 kΩ.
[0008] Preferably, the output end of the operational amplifier B is connected to the air pressure sensor Baro.
[0009] The utility model provides a circuit for realizing intelligent pressure control of a massage airbag, which has the advantages that: the utility model realizes closed-loop control of air pressure through feedback from an air pressure sensor, thereby improving control accuracy; the adopted amplification circuit is an instrument amplifier composed of dual operational amplifiers, which has the advantage of large input impedance compared to a single operational amplifier differential amplifier, and is more cost-effective than a three-op-amp instrument amplifier. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0011] Figure 1 This is a circuit schematic diagram of the utility model. DETAILED DESCRIPTION
[0012] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0013] See also Figure 1 The utility model provides an embodiment: a circuit for realizing intelligent pressure control of a massage airbag, comprising an air pressure sensor Baro, an operational amplifier A and an operational amplifier B, the positive input terminal of the operational amplifier A is connected to Input-, the negative input terminal of the operational amplifier A is connected in series with a resistor R4 and then connected to GND, the output terminal of the operational amplifier A is connected in series with the negative input terminal through a resistor R3, the positive input terminal of the operational amplifier B is connected to Input+, the negative input terminal of the operational amplifier B is connected in parallel with resistors R1, R2 and R5, the other end of the resistor R1 is connected to the output terminal of the operational amplifier A, the other end of the resistor R2 is connected to the output terminal of the operational amplifier B, the other end of the resistor R5 is connected to the input terminal of the operational amplifier A, the positive input terminal of the power supply of the operational amplifier A is connected to VCC, the negative input terminal of the power supply is connected to GND, the resistance values of the resistors R1, R2, R3 and R4 are all 24kΩ, the resistance value of the resistor R5 is 1kΩ, and the output terminal of the operational amplifier B is connected to the air pressure sensor Baro.
[0014] Working principle: When the utility model is used to control the pressure of the massage airbag, the air pressure of the airbag is detected by the air pressure sensor Baro, the differential voltage is amplified by the amplifier circuit, and the single-ended voltage is output to the ADC for collection to achieve closed-loop control of the air pressure. Among them, the amplifier circuit adopts an instrument amplifier composed of an operational amplifier A and an operational amplifier B, with a gain of 50V / V. The air pressure sensor Baro inputs a 5V-12V voltage and outputs a millivolt voltage.
[0015] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0016] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.
[0017] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.
Claims
1. A circuit for realizing intelligent pressure control of a massage airbag, comprising an air pressure sensor Baro, an operational amplifier A and an operational amplifier B, characterized in that: The positive input terminal of the operational amplifier A is connected to Input-, the negative input terminal of the operational amplifier A is connected in series with a resistor R4 and then connected to GND, the output terminal of the operational amplifier A and the negative input terminal are connected in series through a resistor R3, the positive input terminal of the operational amplifier B is connected to Input+, the negative input terminal of the operational amplifier B is connected in parallel with resistors R1, R2 and R5, the other end of the resistor R1 is connected to the output terminal of the operational amplifier A, the other end of the resistor R2 is connected to the output terminal of the operational amplifier B, and the other end of the resistor R5 is connected to the input terminal of the operational amplifier A.
2. A circuit for realizing intelligent pressure control of a massage airbag according to claim 1, characterized in that: The positive power input terminal of the operational amplifier A is connected to VCC, and the negative power input terminal is connected to GND.
3. A circuit for realizing intelligent pressure control of a massage airbag according to claim 1, characterized in that: The resistance values of the resistors R1 , R2 , R3 and R4 are all 24 kΩ.
4. The circuit for realizing intelligent pressure control of a massage airbag according to claim 1, characterized in that: The resistance value of the resistor R5 is 1 kΩ.
5. The circuit for realizing intelligent pressure control of massage airbags according to claim 1, characterized in that: The output end of the operational amplifier B is connected to the air pressure sensor Baro.