CN112594175A - Medical vacuum negative pressure machine driving system - Google Patents
Medical vacuum negative pressure machine driving system Download PDFInfo
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- CN112594175A CN112594175A CN202011297806.3A CN202011297806A CN112594175A CN 112594175 A CN112594175 A CN 112594175A CN 202011297806 A CN202011297806 A CN 202011297806A CN 112594175 A CN112594175 A CN 112594175A
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- 230000008859 change Effects 0.000 claims abstract description 48
- 238000012545 processing Methods 0.000 claims abstract description 10
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- 230000002441 reversible effect Effects 0.000 claims description 16
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- 239000004593 Epoxy Substances 0.000 claims description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims description 3
- 239000003365 glass fiber Substances 0.000 claims description 3
- 229910052744 lithium Inorganic materials 0.000 claims description 3
- 239000000758 substrate Substances 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 abstract description 5
- 230000003321 amplification Effects 0.000 description 25
- 238000003199 nucleic acid amplification method Methods 0.000 description 25
- 206010052428 Wound Diseases 0.000 description 14
- 208000027418 Wounds and injury Diseases 0.000 description 13
- 230000006872 improvement Effects 0.000 description 10
- 230000000087 stabilizing effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 230000035876 healing Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 210000001519 tissue Anatomy 0.000 description 2
- 208000032544 Cicatrix Diseases 0.000 description 1
- 208000013935 Electric injury Diseases 0.000 description 1
- 206010063560 Excessive granulation tissue Diseases 0.000 description 1
- 208000035415 Reinfection Diseases 0.000 description 1
- 208000025865 Ulcer Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 210000002615 epidermis Anatomy 0.000 description 1
- 210000000416 exudates and transudate Anatomy 0.000 description 1
- 210000001126 granulation tissue Anatomy 0.000 description 1
- 208000015181 infectious disease Diseases 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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- 238000007639 printing Methods 0.000 description 1
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- 230000035945 sensitivity Effects 0.000 description 1
- 231100000397 ulcer Toxicity 0.000 description 1
- 230000029663 wound healing Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
- F04B49/065—Control using electricity and making use of computers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B37/00—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00
- F04B37/10—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use
- F04B37/14—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use to obtain high vacuum
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Continuous-Control Power Sources That Use Transistors (AREA)
- External Artificial Organs (AREA)
Abstract
本发明提供一种医用真空负压机驱动系统，包括输入电源(1)、MCU控制器(9)、功率放大电路(5)、负压泵组件(6)、气压采集电路(7)；所述输入电源(1)与MCU控制器(9)电性连接，用于对医用真空负压机驱动系统供电；所述功率放大电路(5)接受来自于MCU控制器(9)的控制信号，控制负压泵组件(6)启动、关闭或停止；所述负压泵组件(6)接受功率放大电路(5)控制其启动、关闭或停止；所述气压采集电路(7)设置于负压泵组件(6)的进气口上，用于采集负压环境的气压变化，并将其转化为电压变化，输出电压变化数据至MCU控制器(9)；所述MCU控制器(9)用于采集、处理和控制。该驱动系统实现了控制电路板与负压泵组件、输入电源的直接连接，省去了一些外围器件，控制电路板面积较小，达到整体元件布局简洁，整机使用更加便捷。The invention provides a driving system for a medical vacuum negative pressure machine, comprising an input power supply (1), an MCU controller (9), a power amplifier circuit (5), a negative pressure pump assembly (6), and an air pressure collection circuit (7); The input power supply (1) is electrically connected to the MCU controller (9) for supplying power to the drive system of the medical vacuum negative pressure machine; the power amplifier circuit (5) accepts the control signal from the MCU controller (9), Control the negative pressure pump assembly (6) to start, close or stop; the negative pressure pump assembly (6) is controlled by the power amplifying circuit (5) to start, close or stop; the air pressure collection circuit (7) is set in the negative pressure The air inlet of the pump assembly (6) is used to collect the air pressure change of the negative pressure environment, convert it into a voltage change, and output the voltage change data to the MCU controller (9); the MCU controller (9) is used for Acquisition, processing and control. The drive system realizes the direct connection between the control circuit board and the negative pressure pump assembly and the input power supply, eliminating some peripheral devices, and the area of the control circuit board is small, so that the overall component layout is simple and the whole machine is more convenient to use.
Description
Technical Field
The invention belongs to the field of medical instruments, and particularly relates to a medical vacuum negative pressure machine driving system.
Background
In recent years, negative pressure wound treatment management is widely applied to healing treatment of various local tissue wounds as a closed negative pressure treatment technology, and the application of the negative pressure wound treatment management technology can ensure that a negative pressure environment is formed on the surface of a tissue wound and promote the wound healing.
At present, common negative pressure machines and negative pressure drainage devices are used together with negative pressure tanks and drainage bottles, and the devices are mainly used for collecting a large amount of seepage which overflows from wounds aiming at wound management such as large-area ulcer, burn, electric injury and the like with large seepage. There are three problems with this type of device in actual use: 1. the negative pressure drainage device is mainly used for collecting a large amount of seepage, and after collection, a negative pressure environment cannot be constructed on the surface of a wound all the time, so that recurrent infection is easy; 2. the negative pressure drainage device is mainly used for collecting wound exudate aiming at an open wound, and when the negative pressure drainage device is used for a sutured wound, granulation tissues of the epidermis are damaged due to overlarge negative pressure attraction, so that the recovery and healing of the wound are influenced; 3. the negative pressure drainage device has a large negative pressure value range, cannot achieve fine negative pressure environmental management aiming at sutured wounds, and is not beneficial to removing and treating wound scars. Therefore, a medical vacuum negative pressure machine with refined negative pressure environment management can be constructed for sutured wounds, and it is necessary to design a medical vacuum negative pressure machine driving system capable of meeting the requirements.
Disclosure of Invention
The invention provides a medical vacuum negative pressure machine driving system which is high in negative pressure acquisition sensitivity, fine in negative pressure value and low in circuit cost aiming at the technical problems in the background technology.
The invention provides a medical vacuum negative pressure machine driving system which comprises an input power supply (1), an MCU (microprogrammed control unit) controller (9), a power amplification circuit (5), a negative pressure pump assembly (6) and an air pressure acquisition circuit (7);
the input power supply (1) is electrically connected with the MCU controller (9) and is used for supplying power to the medical vacuum negative pressure machine driving system;
the power amplification circuit (5) receives a control signal from the MCU controller (9) to control the start, the close or the stop of the negative pressure pump assembly (6);
the negative pressure pump assembly (6) receives a signal for controlling the power amplification circuit (5) to start, close or stop;
the air pressure acquisition circuit (7) is arranged on an air inlet of the negative pressure pump assembly (6) and is used for acquiring air pressure change of a negative pressure environment, converting the air pressure change into voltage change and outputting voltage change data to the MCU controller (9);
the MCU controller (9) is used for acquiring and processing data from the air pressure acquisition circuit (7) and controlling the operation of the power amplification circuit (5).
As an improvement, the input power supply (1) is a dry battery, a lithium battery or a direct current power supply externally connected through an adapter; the input power supply is a power supply center of a medical vacuum negative pressure machine driving system.
As another improvement, the power amplifying circuit (5) is a switch circuit based on an N-channel field effect transistor, wherein the threshold voltage of a grid electrode and a source electrode of the N-channel field effect transistor is 1.5V @240uA, and the on-resistance is lower than 0.45 omega; the power amplification circuit is a circuit system for driving the negative pressure pump assembly, and the MCU controller outputs signals to control the conduction or the cut-off of the N-channel field effect tube in real time, so that the function of controlling the start or the pause of the negative pressure pump assembly is realized.
As another improvement, the negative pressure pump assembly (6) comprises a diaphragm pump, a motor base plate; the motor base plate is a printed circuit board which is mainly made of an epoxy glass fiber cloth substrate, and positive and negative electric signal lines are arranged in the printed circuit board and are connected with a power amplifying circuit; the diaphragm pump is provided with positive and negative electric connection points which are electrically connected with positive and negative electric signal wires of a motor base plate; the air passage pipeline of the diaphragm pump is provided with an air inlet and an air outlet, and the air pressure acquisition circuit is arranged on the air inlet.
As another improvement, the air pressure acquisition circuit (7) is an air pressure acquisition circuit based on the Wheatstone bridge principle, a precise resistance type air pressure sensor for converting air pressure change into voltage change is realized, and the acquisition pressure range is 0-37 kPa; preferably, the air pressure acquisition circuit (7) is a sensor for converting the air pressure change of 10 kPa-20 kPa into the voltage change of 6mV-12mV by using a resistance type pressure sensor.
As another improvement, the MCU controller (9) is a medical vacuum negative pressure machine controller based on a low-power consumption chip of STM 8L.
As another improvement, the device also comprises a reverse connection protection circuit (2) and a power management circuit (3); the reverse connection protection circuit (2) and the power management circuit (3) are sequentially connected in series between the input power supply (1) and the MCU controller (9);
the reverse connection protection circuit (2) is used for preventing the power management circuit (3) from being damaged when the power polarity of the input power (1) is reversely connected, the reverse connection protection circuit comprises a P-channel field effect transistor and an NPN triode, the source electrode and the drain electrode of the P-channel field effect transistor are respectively connected with the output end of the input power (1) and the input end of the power management circuit (3), the connection with the power management circuit is disconnected when the polarity of the input power is reversely connected, the P-channel field effect transistor is conducted when the base electrode of the NPN triode inputs a high level, and the power is normally connected;
the power management circuit (3) comprises a low-input booster circuit and a low-dropout linear voltage stabilizing circuit which are sequentially connected, the low-input booster circuit is a dry battery input power booster circuit and is used for ensuring the stable work of a driving system, the output voltage of a battery pack is continuously reduced along with the consumption of the electric quantity of a battery, and the low-input booster circuit realizes that the input power voltage is still output at the lowest 1.1V; the low-dropout linear voltage stabilizing circuit provides fixed 3.0V power output for the MCU controller and is used for ensuring the performance parameters of the output signal of the 3.0V power such as power supply ripple and high-frequency noise to be optimally processed, the low-input booster circuit belongs to a switch type circuit type, the output power supply signal has high-frequency noise inevitably, the ripple is large, the MCU controller is used as a control center of the whole driving system, and the optimal processing of the high-frequency noise of the power supply is very important to the performance stability of the MCU controller.
As another improvement, the medical vacuum negative pressure machine driving system further comprises an LED display circuit (4) which is electrically connected with the MUC controller (9) and is used for displaying whether the function of the medical vacuum negative pressure machine driving system is normal or not; for example, the circuit may include 3 monochromatic LED lamps and 3 NPN transistors; the 3 LED lamps are respectively green, yellow and red, and the on and off of each LED lamp is controlled by controlling the on and off of an NPN triode through the output signal of the MCU controller (9), so that whether the function of the medical vacuum negative pressure machine driving system is normal or not is displayed.
As another improvement, the device also comprises a differential amplification circuit (8) which is connected in series between the air pressure acquisition circuit (7) and the MCU controller (9) and is used for amplifying the voltage change of 6mV-12mV output by the air pressure acquisition circuit (7), matching output impedance and then sending the voltage change to the MCU controller (9); the differential amplifying circuit is divided into an integrated circuit scheme formed by instrument operational amplifier chips and a discrete circuit scheme formed by general operational amplifier chips, wherein the discrete circuit scheme is an instrument differential amplifying circuit formed by combining three operational amplifiers with low power consumption and high precision; the reasonable gain of the instrument differential amplification circuit can be debugged through the front-end gain resistor, the rear-end gain resistor and the direct-current bias voltage.
As another improvement, the device further comprises a voltage acquisition circuit (11), wherein the voltage acquisition circuit (11) is used for acquiring the voltage change of the input power supply (1) in real time and is connected to the MCU controller (9); the voltage acquisition circuit (11) is an RC filter circuit formed by a capacitor and a capacitor.
As another improvement, the medical vacuum negative pressure machine further comprises a key control circuit (10) which is connected with the MCU controller (9) and is used for starting, closing or suspending the driving system of the medical vacuum negative pressure machine and presetting a negative pressure range; the key control circuit is an external interrupt trigger circuit formed by mechanical keys, and mainly realizes the functions of starting, gear selection, shutdown and the like of the medical vacuum negative pressure machine.
On the other hand, the invention provides a medical vacuum negative pressure machine driving system which comprises an input power supply (1), an MCU (microprogrammed control unit) controller (9), a differential amplification circuit (8), a negative pressure pump assembly (6) and an air pressure acquisition circuit (7), wherein the input power supply (1) is electrically connected with the MCU controller (9), the air pressure acquisition circuit (7) is arranged on an air inlet of the negative pressure pump assembly (6), and the differential amplification circuit (8) is connected between the air pressure acquisition circuit (7) and the MCU controller (9) in series.
Further, the power supply device further comprises a reverse connection protection circuit (2) and a power supply management circuit (3) which are sequentially connected in series between the input power supply (1) and the MCU controller (9), wherein the power supply management circuit (3) comprises a low-input booster circuit and a low-dropout linear voltage stabilizing circuit which are sequentially connected.
Has the advantages that: compared with the prior art, the medical vacuum negative pressure machine driving system provided by the invention has the following outstanding advantages:
1. the battery has strong cruising ability. The power management circuit, especially relate to low input boost circuit and low dropout linear voltage regulator circuit and can guarantee that battery power maximize utilizes, MCU controller and power amplifier circuit performance are more stable. Meanwhile, the differential amplification circuit adopts a low-power consumption chip, the MCU controller also has a standby low-power consumption processing algorithm, and the power consumption of the whole driving system is lower.
2. Low cost and high performance-price ratio. Peripheral devices required by the instrument operational amplifier chip integrated circuit scheme of the differential amplifier circuit are few, and the cost of component materials is low; particularly, the universal operational amplifier is adopted to form a discrete circuit scheme, and the operational amplifier chip of the universal operational amplifier instrument is lower in cost.
3. And the power source is reversely connected with a protection function. The power supply reverse connection protection circuit formed by the P-channel field effect transistor and the NPN triode is utilized, when the polarity of an input power supply is opposite, the input power supply and the power supply management circuit are in a disconnected state, and the power supply management circuit can normally work only if the polarity of the input power supply is correct.
4. Simple and convenient. The driving system realizes the direct connection of the control circuit board, the negative pressure pump assembly and the input power supply, saves some peripheral devices, has small area of the control circuit board, and achieves the aims of concise overall element layout and more convenient and faster overall use.
Drawings
Fig. 1 is a circuit block diagram of a medical vacuum negative pressure machine driving system of the present invention.
Fig. 2 is a block diagram of a discrete differential circuit formed by the universal operational amplifier of the present invention.
Fig. 3 is a block diagram of an integrated circuit formed by the operational amplifier chip of the meter according to the present invention.
Fig. 4 is a block diagram of the internal circuit of the air pressure acquisition circuit of the present invention.
In the figure: 1-input power supply, 2-reverse connection protection circuit, 3-power management circuit, 4-LED display circuit, 5-power amplification circuit, 6-negative pressure pump assembly, 7-air pressure acquisition circuit, 8-differential amplification circuit, 9-MCU controller, 10-key control circuit, 11-voltage acquisition circuit, 811-on-chip operational amplifier, 812-on-chip precision resistor, 813-external resistor, 821-constant current source circuit, 822-voltage follower, 823-feedback resistor, 824-front-end gain resistor, 825-differential circuit, 826-back-end gain resistor and 827-direct current bias voltage.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples.
A medical vacuum negative pressure machine driving system is shown in figure 1 and comprises an input power supply (1), a reverse connection protection circuit (2), a power supply management circuit (3), an LED display circuit (4), a power amplification circuit (5), a negative pressure pump assembly (6), an air pressure acquisition circuit (7), a differential amplification circuit (8), an MCU controller (9), a key control circuit (10) and a voltage acquisition circuit (11).
The input power supply (1) is electrically connected with the MCU controller (9) and is used for supplying power to the medical vacuum negative pressure machine driving system; the input power supply (1) is a dry battery, a lithium battery or a direct current power supply externally connected through an adapter; the input power supply is a power supply center of a medical vacuum negative pressure machine driving system.
The reverse connection protection circuit (2) and the power management circuit (3) are sequentially connected in series between the input power supply (1) and the MCU controller (9);
the reverse connection protection circuit (2) is used for preventing the power supply management circuit (3) from being damaged when the power supply polarity of the input power supply (1) is reversely connected, and comprises a P-channel field effect transistor and an NPN triode, wherein the source electrode and the drain electrode of the P-channel field effect transistor are respectively connected with the output end of the input power supply (1) and the input end of the power supply management circuit (3), the connection with the power supply management circuit is disconnected when the input power supply polarity is reversely connected, the P-channel field effect transistor is conducted when the base electrode of the NPN triode inputs a high level, and the power supply is normally connected; the reverse connection protection circuit 2 is based on a P-channel field effect transistor, and can ensure that the power management circuit 3 is protected under the condition that the polarity of the input power supply 1 is reverse, namely, the power management circuit 3 has power input only if the input power supply 1 is connected with correct polarity, otherwise, the power management circuit 3 has no power input.
Specifically, the reverse connection protection circuit 2 mainly comprises a P-channel field effect transistor and an NPN triode, wherein the base electrode of the NPN triode is connected with the positive electrode of the output signal of the input power supply 1, the emitting electrode of the NPN triode is connected with the negative electrode of the output signal of the input power supply 1, and the collecting electrode of the NPN triode is connected with the grid electrode of the P-channel field effect transistor; the source electrode of the P-channel field effect transistor is connected with the output signal anode of the input power supply 1, and the drain electrode of the P-channel field effect transistor is connected with the input end of the power supply management circuit 3. When the output electrical polarity of the input power supply 1 is correct, the NPN triode is conducted, the P-channel field effect transistor is conducted, and a signal of the input power supply 1 is normally transmitted to the input end of the power management circuit 3; when the output electrical polarity of the input power supply 1 is opposite, the NPN triode is cut off, the P-channel field effect transistor is cut off, and the signal of the input power supply 1 cannot be transmitted to the input end of the power management circuit 3.
The power management circuit (3) comprises a low-input booster circuit and a low-dropout linear voltage stabilizing circuit which are sequentially connected, wherein the low-input booster circuit is a dry battery input power booster circuit and is used for ensuring the stable work of a driving system, the output voltage of a battery pack is continuously reduced along with the consumption of the electric quantity of a battery, and the low-input booster circuit realizes that the input power voltage is still output at the lowest 1.1V; the low-dropout linear voltage stabilizing circuit provides fixed 3.0V power output for the MCU controller and is used for ensuring the performance parameters of the output signal of the 3.0V power such as power supply ripple and high-frequency noise to be optimally processed, the low-input booster circuit belongs to a switch type circuit type, the output power supply signal has high-frequency noise inevitably, the ripple is large, the MCU controller is used as a control center of the whole driving system, and the optimal processing of the high-frequency noise of the power supply is very important to the performance stability of the MCU controller.
The power amplification circuit (5) receives a control signal from the MCU controller (9) and controls the negative pressure pump assembly (6) to start, close or stop; the power amplification circuit (5) is a switch circuit based on an N-channel field effect transistor, wherein the threshold voltage of a grid source electrode of the N-channel field effect transistor is 1.5V @240uA, and the on-resistance is lower than 0.45 omega; the power amplification circuit is a circuit system for driving the negative pressure pump assembly, and the MCU controller outputs signals to control the conduction or the cut-off of the N-channel field effect tube in real time, so that the function of controlling the start or the pause of the negative pressure pump assembly is realized.
Specifically, the power amplifying circuit 5 is a switching circuit based on an N-channel field effect transistor, wherein a drain electrode of the N-channel field effect transistor is connected with a negative electrical connection point of the diaphragm pump, a gate electrode of the N-channel field effect transistor is connected with the MCU controller 9, and a source electrode of the N-channel field effect transistor is connected with a negative electrical connection point of the input power supply 1. When the MCU controller 9 outputs a high level, the N-channel field effect tube is conducted, the negative electrical connection point of the diaphragm pump is communicated with the negative electrical connection point of the input power supply 1, and the negative pressure pump assembly starts to work to realize the air pumping function; when the MCU controller 9 outputs low level, the N-channel field effect tube is cut off, the negative electric connection point of the diaphragm pump is disconnected with the negative electric connection point of the input power supply 1, and the negative pressure pump assembly stops working.
The negative pressure pump assembly (6) is controlled by the power amplification circuit (5) to start, close or stop; the negative pressure pump assembly (6) comprises a diaphragm pump and a motor base plate; the motor base plate is a printed circuit board which is mainly made of an epoxy glass fiber cloth substrate, and positive and negative electric signal lines are arranged in the printed circuit board and are connected with a power amplifying circuit; the diaphragm pump is provided with positive and negative electric connection points which are electrically connected with positive and negative electric signal wires of the motor base plate; the air passage pipeline of the diaphragm pump is provided with an air inlet and an air outlet, and the air pressure acquisition circuit is arranged on the air inlet.
Specifically, the negative pressure pump assembly 6 mainly comprises a diaphragm pump, a motor base plate and an air channel pipeline, wherein the diaphragm pump has positive and negative electric connection points; the motor base plate is a printed circuit board, and positive and negative signal lines drawn in the plate are correspondingly connected with positive and negative electric connection points of the diaphragm pump one by one; the air passage pipeline is provided with an air inlet and an air outlet. The positive and negative electric connection points of the diaphragm pump are connected with the positive and negative signal lines of the motor base plate; the air inlet of the air passage pipeline is connected to the air pressure acquisition circuit 7; the positive signal line connecting point of the motor base plate is connected with the positive electrode of the power management circuit 3, and the positive signal line of the motor base plate is connected with the power amplification circuit 5.
The air pressure acquisition circuit (7) is arranged on an air inlet of the negative pressure pump assembly (6) and is used for acquiring air pressure change of a negative pressure environment, converting the air pressure change into voltage change and outputting voltage change data to the MCU controller (9); the air pressure acquisition circuit (7) is based on a Wheatstone bridge principle, realizes a precise resistance type air pressure sensor for converting air pressure change into voltage change, and can acquire the pressure within the range of 0-37 kPa; preferably, the air pressure acquisition circuit (7) is a sensor for converting the air pressure change of 10 kPa-20 kPa into the voltage change of 6mV-12mV by using a resistance type pressure sensor.
Specifically, as shown in fig. 2, the air pressure acquisition circuit 7 is constructed by a resistance type air pressure sensor based on the wheatstone bridge principle, in which the resistance of the strain gauge changes due to air pressure changes, thereby generating voltage changes. The air pressure sensor pin used in the invention is welded on the printed circuit board, the gas collecting port at the top end is inserted into the corresponding air tap, and the negative pressure environment in the air tap is collected in real time, so that the function of converting the air pressure change of 10 kPa-20 kPa into the voltage change of 6mV-12mV is realized.
As shown in fig. 4, the air pressure collecting circuit 7 mainly includes a bridge circuit composed of four piezoresistors R1, R2, R3 and R4, and measures the change of the air flow by using the change of the resistance; when no air flow changes, namely no air pressure changes, all resistance values in the bridge are equal, and voltages between the AB and the CD are equal; when a change in air pressure is applied to the bridge, the resistances of two opposing resistors will increase (e.g., R1, R3), while the resistances of the other two resistors will decrease (e.g., R2, R4), and the increasing and decreasing resistances will be equal to each other, thereby outputting a varying differential voltage, i.e., a change in voltage between AB and CD.
The differential amplification circuit (8) is connected in series between the air pressure acquisition circuit (7) and the MCU controller (9) and is used for amplifying the voltage change of 6mV-12mV output by the air pressure acquisition circuit (7), matching output impedance and then transmitting the voltage change to the MCU controller (9); the differential amplifying circuit is divided into an integrated circuit scheme formed by instrument operational amplifier chips and a discrete circuit scheme formed by general operational amplifier chips, wherein the discrete circuit scheme is an instrument differential amplifying circuit formed by combining three operational amplifiers with low power consumption and high precision; the reasonable gain of the instrument differential amplification circuit can be debugged through the front-end gain resistor, the rear-end gain resistor and the direct-current bias voltage.
Specifically, the differential amplifier circuit 8 has two circuit schemes, which are an integrated circuit scheme formed by an instrument operational amplifier chip and a discrete circuit scheme formed by a general operational amplifier chip, and each circuit scheme also has advantages and disadvantages.
Based on the integrated circuit scheme formed by the instrument operational amplifier chip, as shown in fig. 3, the circuit scheme has fewer peripheral devices, a very high common mode rejection ratio, a very low input bias current, and a very low operating power consumption, and is a good choice for processing analog differential signals, but the circuit scheme has a high chip cost which is ten times of the cost of a general operational amplifier chip, and in addition, the deviation between the resistances of the on-chip precision resistor 812 and the external resistor 813 of the integrated circuit scheme may reach 20%, and at the same time, there is a thermal performance difference, for example, the on-chip precision resistor 812 and the external resistor 813 may have opposite temperature coefficients. Therefore, some products have high cost requirements and short service time, and such circuit schemes do not need to be considered.
As shown in fig. 3, the air pressure acquisition circuit (7) outputs a varying differential voltage, the positive and negative signals of the differential voltage are connected to the inverting input terminal of the differential instrument amplification circuit 811, and the on-chip precision resistor 812 is connected to the output terminal of the differential instrument amplification circuit 811 to realize the adjustment of the gain; the external circuit 813 is connected to the upper and lower voltage dividing connection points A, B of the on-chip precision circuit 812, respectively.
As shown in fig. 2, the discrete circuit scheme formed based on the general operational amplifier chip has many peripheral elements, mainly resistors and capacitors, and has low material cost, but the hardware debugging work of the circuit scheme is complicated, particularly the accuracy control and matching debugging of the feedback resistor 823, the front-end gain resistor 824 and the rear-end gain resistor 826 are performed, and meanwhile, the requirement on the circuit layout is high, and the minimum design of the circulation path of the differential signal and the analog power signal needs to be fully considered. Furthermore, the input signal is amplified by the voltage follower 822, the obtained input differential voltage is presented at two ends of the front-end gain resistor 824, in the process, the gain of the differential signal can be adjusted by the front-end gain resistor 824, here, the gain is denoted as Au1, and the gain of the common-mode signal is only amplified by the voltage follower 822, which means that the common-mode printing ratio of the input signal can also be adjusted by the front-end gain resistor 824, which is significant for the differential signal acquisition. Then, the signal processed by the front end is transmitted to the differential circuit 825, the back-end gain resistor 826 may further amplify the signal processed by the front end, where the gain is denoted as Au2, the gain of the final output signal is Au1 Au2, and the combination of Au1 Au2 is set to have a certain logical relationship with the dc bias voltage 827, for example, when Au1 Au2 is 40 times, the dc bias voltage needs to be set to about 0.4V; when Au1 is 200 times Au2, the dc bias voltage needs to be set to about 0.2V. It should be noted that, the back-end gain resistor 826 amplifies the signal and simultaneously amplifies the common-mode signal, which undesirably reduces the common-mode rejection ratio of the whole circuit, so that it is necessary to select the appropriate Au2 according to the actual circuit debugging. Therefore, the discrete circuit scheme formed by the general operational amplifier chip provided by the invention has the advantages of low cost, adjustable common mode rejection ratio, matching of resistance and thermal performance and the like.
As shown in fig. 2, a comparator is formed by a voltage dividing resistor and an operational amplifier 821 to stabilize the output voltage; the output voltage is connected to an air pressure acquisition circuit (7), and a constant current source is utilized to flow through a variable resistor, so that a variable voltage is correspondingly generated. The output voltage is a differential voltage and then connected to a buffer circuit 822; the amplitude of the output voltage of the buffer circuit 822 can be adjusted by using the gain combination resistors 823 and 824; the proportional resistor 826 and the differential operational amplifier 825 form an instrument amplifying circuit, and amplify and output the differential voltage output by the air pressure acquisition circuit (7); the dc bias voltage 827 is connected to the inverting input of the meter's amplifier circuit.
The MCU controller (9) is used for collecting, processing and controlling; the MCU controller (9) is a medical vacuum negative pressure machine controller based on a low-power consumption chip of STM 8L.
And the LED display circuit (4) is used for displaying whether the function of the medical vacuum negative pressure machine driving system is normal or not.
Specifically, the LED display circuit 4 is a switching circuit formed based on an NPN transistor, and mainly controls the on/off of the negative electrode of the LED lamp. Further, when the MCU controller 9 outputs a high level, the NPN transistor is turned on, and the LED lamp is turned on; when the MCU controller 9 outputs a low level, the NPN triode is cut off, and the LED lamp is turned off. The LED display circuit 4 provided by the invention consists of three monochromatic LED lamps, which are respectively green, yellow and red, and the function indication is realized by the on-off of the corresponding LED lamps.
The key control circuit (10) is connected with the MCU controller (9) and is used for starting, closing or pausing the medical vacuum negative pressure machine driving system and presetting a negative pressure range; the key control circuit is an external interrupt trigger circuit formed by mechanical keys, and mainly realizes the functions of starting, gear selection, shutdown and the like of the medical vacuum negative pressure machine.
The voltage acquisition circuit (11) is used for acquiring the voltage change of the input power supply (1) in real time and is connected to the MCU controller (9); the voltage acquisition circuit (11) is an RC filter circuit formed by a capacitor and a capacitor.
Specifically, the voltage acquisition circuit 11 is set for monitoring the electric quantity of the input power supply 1 in real time, and the voltage acquisition circuit 11 is an RC filter network. The current of the input power supply 1 flows through two ends of a resistor of the RC filter network, so that the current change is converted into the voltage change, and then the voltage change is connected to an AD acquisition port of the MCU controller 9, so that the function of monitoring the electric quantity of the input power supply 1 in real time by the MCU controller 9 is realized. The capacitance of the RC filter network mainly filters noise interference in the current path, ensuring optimal processing of the signal power supply ripple connected to the MCU controller 9.
The working principle of the device is as follows: the air pressure acquisition circuit 7 converts the change of the negative pressure value expected to be maintained into a corresponding voltage change, the voltage change is subjected to proportional amplification, signal matching and the like of the differential amplification circuit 8 and then is transmitted to the MCU controller 9, and the voltage change acquired by the MCU controller 9 is compared and judged with the expected voltage change set by a program, so that whether the current negative pressure value is in an expected range or not is obtained; if yes, the MCU controller 9 outputs a control signal to keep the negative pressure pump assembly 6 in a standby state, and outputs the control signal to enable the LED display circuit 4 to be in a green light normally-on state; if not, the MCU controller 9 outputs a control signal to enable the negative pressure pump assembly 6 to be in a working state, and outputs a control signal to enable the LED display circuit 4 to be in a green light flickering state.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (13)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011297806.3A CN112594175A (en) | 2020-11-18 | 2020-11-18 | Medical vacuum negative pressure machine driving system |
| PCT/CN2021/130507 WO2022105697A1 (en) | 2020-11-18 | 2021-11-15 | Drive system for medical vacuum negative-pressure machine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011297806.3A CN112594175A (en) | 2020-11-18 | 2020-11-18 | Medical vacuum negative pressure machine driving system |
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| CN112594175A true CN112594175A (en) | 2021-04-02 |
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| CN202011297806.3A Pending CN112594175A (en) | 2020-11-18 | 2020-11-18 | Medical vacuum negative pressure machine driving system |
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| WO (1) | WO2022105697A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2022105697A1 (en) * | 2020-11-18 | 2022-05-27 | 江苏苏中药业集团医疗器械有限公司 | Drive system for medical vacuum negative-pressure machine |
| CN114566943A (en) * | 2022-02-23 | 2022-05-31 | 睿士医疗科技(浙江)有限公司 | Overvoltage protection system of hardware |
| CN117717671A (en) * | 2024-01-15 | 2024-03-19 | 邦士医疗科技股份有限公司 | Medical perfusion suction system |
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| WO2022105697A1 (en) | 2022-05-27 |
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