Flow control system of air pump and endoscope air supply device

Abstract

The utility model discloses a flow control system of an air pump and an endoscope air supply device, which comprise a power supply module, a flow detection module, a voltage regulation module, a digital-to-analog conversion module, a control module and a flow control valve connected with the air pump, and the power supply module supplies power to the flow control valve to open the flow control valve. The flow detection module obtains air flow and feeds back the air flow to the control module, the control module outputs a corresponding digital control signal according to the air flow, and the digital control signal is converted into analog voltage through the digital-to-analog conversion module and output to the voltage regulation module. The voltage adjusting module outputs corresponding adjusting voltage according to the analog voltage and loads the adjusting voltage to the power supply end of the flow control valve so as to control the opening degree of the flow control valve, the air supply flow can be automatically adjusted, and the control precision is high.

Description

Technical Field

[0001] The present utility model relates to the air supply control technology of endoscope products, and particularly to a flow control system of an air pump and an endoscopic air supply device. Background Art

[0002] With the continuous development of endoscope technology in the field of medical devices, the technical requirements of endoscopes are also constantly improving. The air supply pump is used by medical institutions as an auxiliary air supply control for carbon dioxide gas (CO2) during endoscopic surgery, and is used to inject carbon dioxide into the body (such as into the stomach or intestine) through the endoscope to facilitate the observation and treatment of electronic endoscopes. The existing carbon dioxide air supply pump products mainly focus on operations such as air supply pressure and temperature, and ignore the control of the air supply volume, resulting in inconvenient operations caused by poor accuracy. During the examination, problems such as postoperative pain and discomfort may occur due to excessive air supply volume during the doctor's operation. In the existing technology, when operating, the opening degree of the valve needs to be adjusted manually, and it is often difficult to control the gas flow rate, and the air flow control is not precise enough. Summary of the Utility Model

[0003] In view of the deficiencies of the above-mentioned existing technologies, the purpose of the present utility model is to provide a flow control system of an air pump and an endoscopic air supply device, which can automatically control the flow rate of the air pump.

[0004] To solve the above technical problems, the present utility model adopts the following technical solutions:

[0005] A flow control system of an air pump, which includes a power supply module, a flow detection module, a voltage regulation module, a digital-to-analog conversion module, a control module, and a flow control valve connected to the air pump. The power supply module supplies power to the flow control valve to open the flow control valve. The flow detection module obtains the air flow rate and feeds it back to the control module. The control module outputs a corresponding digital control signal according to the air flow rate. The digital control signal is converted into an analog voltage by the digital-to-analog conversion module and output to the voltage regulation module. The voltage regulation module outputs a corresponding regulated voltage according to the analog voltage and loads it to the power supply terminal of the flow control valve to control the opening degree of the flow control valve.

[0006] In the flow control system of the air pump, the power supply module outputs a reference voltage to supply power to the voltage regulation module, and the voltage regulation module outputs the regulated voltage according to the reference voltage and the analog voltage to adjust the opening degree of the flow control valve.

[0007] In the flow control system of the air pump, the control module includes a control chip. The PD8 pin, PB12 pin, PB13 pin, and PB15 pin of the control chip are connected to the digital-to-analog conversion module, and the PD9 pin of the control chip is connected to the power supply module.

[0008] In the flow control system of the air pump, the digital-to-analog conversion module includes a DAC chip, a first resistor, a second resistor, a third resistor, a fourth resistor, and a fifth resistor. The pin of the DAC chip is connected to the PB12 pin of the control chip through the first resistor. The VoutA pin of the DAC chip is connected to the voltage regulation module through the second resistor. The pin of the DAC chip is connected to the PD8 pin of the control chip through the third resistor. The DIN pin of the DAC chip is connected to the PB15 pin of the control chip through the fourth resistor. The SCLK pin of the DAC chip is connected to the PB13 pin of the control chip through the fifth resistor.

[0009] In the flow control system of the air pump, the power supply module includes a first filtering unit and a power management unit. The input end of the first filtering unit is connected to the power supply. The output end of the first filtering unit is connected to the power supply ends of the control module, the regulation module, and the flow control valve through the power management unit.

[0010] In the flow control system of the air pump, the power management unit includes a power chip, a sixth resistor, a seventh resistor, and a first inductor. The VIN pin of the power chip is connected to the first filtering unit. The EN pin of the power chip is connected to the PD9 pin of the control chip through the sixth resistor and is also grounded through the seventh resistor. The PH pin of the power chip is connected to the first end of the voltage regulation module and the power supply end of the flow control valve through the first inductor. The VSENSE pin of the power chip is connected to the second end of the voltage regulation module. The third end of the voltage regulation module is connected to the VoutA pin of the DAC chip.

[0011] In the flow control system of the air pump, the power management unit further includes a diode. The cathode of the diode is connected to the PH pin of the power chip, and the anode of the diode is grounded.

[0012] In the flow control system of the air pump, the voltage regulation module includes an eighth resistor, a ninth resistor, and a tenth resistor. One end of the eighth resistor is connected to the VoutA pin of the DAC chip. The other end of the eighth resistor is connected to the VSENSE pin of the power chip, is also connected to the power supply end of the flow control valve through the ninth resistor, and is further grounded through the tenth resistor.

[0013] In the flow control system of the air pump, the first filtering unit includes a second inductor, a first capacitor, a second capacitor, and a third capacitor. One end of the second inductor is connected to the power supply, and the other end of the second inductor is connected to the VIN pin of the power supply chip and is also grounded through the first capacitor. The second capacitor and the third capacitor are connected in parallel with the first capacitor.

[0014] An endoscopic air supply device includes an air pump and a flow control system, and the flow control system is connected to the air pump.

[0015] Compared with the prior art, in the flow control system of the air pump provided by the present utility model, a digital control signal is output by the control module and converted into a module voltage by the digital-to-analog conversion module, so that the voltage regulation module outputs a corresponding regulated voltage and loads it to the power supply end of the flow control valve. By combining this regulated voltage with the power supply voltage of the power supply module, the working voltage of the flow control valve is regulated, thereby controlling the opening degree of the flow control valve and realizing automatic regulation of the air supply flow, and the control accuracy is high. Description of the Drawings

[0016] Figure 1 It is a structural block diagram of the flow control system of the air pump provided by the present utility model.

[0017] Figure 2 It is a block diagram of the power supply module, digital-to-analog conversion module, and voltage regulation module in the flow control system of the air pump provided by the present utility model.

[0018] Figure 3 It is a circuit schematic diagram of the control module in the flow control system of the air pump provided by the present utility model.

[0019] Figure 4 It is a circuit schematic diagram of the digital-to-analog conversion module in the flow control system of the air pump provided by the present utility model.

[0020] Figure 5 It is a circuit schematic diagram of the power supply module and voltage regulation module in the flow control system of the air pump provided by the present utility model.

[0021] Description of the Reference Numerals

[0022] Power supply module 10, first filtering unit 11, power management unit 12, second filtering unit 13, voltage regulation module 20, digital-to-analog conversion module 30, control module 40, flow control valve 50, flow detection module 60, control chip U1, DAC chip U2, first resistor R1, second resistor R2, third resistor R3, fourth resistor R4, fifth resistor R5, power supply chip U3, sixth resistor R6, seventh resistor R7, first inductor L1, diode D1, second inductor L2, first capacitor C1, second capacitor C2, third capacitor C3, eighth resistor R8, ninth resistor R9, tenth resistor R10, eleventh resistor R11, fourth capacitor C4, third inductor L3, fifth capacitor C5, sixth capacitor C6, seventh capacitor C7, eighth capacitor C8 Detailed implementation manners

[0023] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model, and are not used to limit the present utility model.

[0024] The flow control system of the air pump provided by the present utility model is mainly used in conjunction with an electronic endoscope, and is used by a medical institution as an auxiliary gas supply control for carbon dioxide gas (CO2) during an endoscopic operation, and is used to inject carbon dioxide into the body of a subject through the endoscope to facilitate the observation and treatment of the electronic endoscope. The present utility model can filter impurities and perform secondary decompression on the CO2 gas output from a gas source (such as a gas supply tank) through a gas delivery device (such as an air pump), and then control the output through a flow control valve.

[0025] Please refer to Figure 1 , the flow control system of the air pump provided by the present utility model includes a power supply module 10, a voltage regulation module 20, a digital-to-analog conversion module 30, a control module 40, a flow control valve 50 and a flow detection module 60. The flow control valve 50 is connected to an air pump (not shown in the figure) through an air supply pipeline. The power supply module 10 is connected to the first end, the second end of the voltage regulation module 20 and the flow control valve 50. The control module 40 is connected to the third end of the voltage regulation module 20 through the digital-to-analog conversion module 30.

[0026] The power supply module 10 supplies power to the flow control valve 50 to open the flow control valve 50. The flow control valve 50 is arranged on the air supply pipeline of the air pump and is used to control the flow rate of the CO2 gas injected into the human body. The control module 40 outputs a corresponding digital control signal according to the air flow rate. The digital control signal is converted into an analog voltage by the digital-to-analog conversion module 30 and output to the voltage regulation module. The voltage regulation module outputs a corresponding regulated voltage according to the analog voltage and loads it to the power supply terminal of the flow control valve 50 to control the opening degree of the flow control valve 50, that is, the opening degree.

[0027] In an alternative embodiment, the control module 40 is further connected to a flow detection module 60. The flow detection module 60 can be arranged at the air supply pipeline or the output port of the air pump. The air flow rate of the air supply pipeline or the air pump is obtained by the flow detection module 60 and fed back to the control module 40. The control module 40 outputs a digital control signal according to the air flow rate signal it obtains, and is converted into a voltage quantity (i.e., an analog control signal with a corresponding voltage value) by the digital-to-analog conversion module 30, and the voltage regulation module 20 outputs a corresponding regulated voltage and loads it to the power supply terminal of the flow control valve 50. By combining the regulated voltage with the power supply voltage of the power supply module 10, the working voltage of the flow control valve 50 is adjusted, thereby controlling the opening degree of the flow control valve 50, realizing the automatic adjustment of the air supply flow rate, and having high control accuracy.

[0028] Optionally, the flow detection module 60 includes an air flow sensor, which can adopt a pressure sensor with the model number MPXV5050DP. It is a piezoresistive sensor that can provide an accurate, high-level analog output signal. The analog voltage is proportional to the applied pressure. In the present invention, the analog voltage output by the air flow sensor can be divided into multiple levels, and each level corresponds to a corresponding air flow rate. A correspondence table between the voltage level and the air flow rate can be stored in the control module 40. According to the magnitude of the analog voltage, the corresponding air flow rate can be known. Since it is prior art and not the protection point of the present invention, it will not be described in detail here.

[0029] Please refer to Figures 2 to 5 In the flow control system of the present invention, the power supply module 10 includes a first filtering unit 11 and a power management unit 12. The input end of the first filtering unit 11 is connected to the power supply, and the output end of the first filtering unit 11 is connected to the power supply terminals of the control module 40, the voltage regulation module 20, and the flow control valve 50 through the power management unit 12.

[0030] The power supply is a 15V DC power supply. The power management unit 12 is a step-down voltage stabilization unit. After the first filtering unit 11 filters out the noise of the power supply voltage, the power management unit 12 steps down and stabilizes the voltage to output a stable 12V voltage to supply power to the flow control valve 50.

[0031] Further, the power supply module 10 further includes a second filtering unit 13. The second filtering unit 13 is connected to the power management unit 12 and the power supply terminal of the flow control valve 50, such as being connected in series between the power management unit 12 and the power supply terminal of the flow control valve 50, and is used for filtering the voltage output by the power management unit 12 to make the voltage output by the power management unit 12 stable, so as to accurately control the opening degree of the flow control valve 50.

[0032] Please refer to Figures 2 to 5 In the flow control system of the present utility model, the control module 40 includes a control chip U1. The PD8 pin, PB12 pin, PB13 pin, and PB15 pin of the control chip U1 are connected to the digital-to-analog conversion module 30, and the PD9 pin of the control chip U1 is connected to the power management unit 12. Among them, the control chip U1 can adopt a microprocessor with the model of STM32F46VET6. It has rich IO ports and is convenient for function expansion. It uses SPI communication with the digital-to-analog conversion module 30 and the power management unit 12, with fast communication response speed and strong anti-interference function.

[0033] Such as Figure 3 、 Figure 4 As shown in the figure, the digital-to-analog conversion module 30 includes a DAC chip U2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a fifth resistor R5. The first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, and the fifth resistor R5 all play a voltage-dividing role and can be used to protect the control chip U1 and the flow control valve 50. The DAC chip U2 can adopt a digital-to-analog converter of DAC8568, which can convert the digital signal output by the control chip U1 into a voltage quantity. This digital-to-analog converter is a 16-bit, 8-channel, SPI interface digital-to-analog conversion chip, and its accuracy can reach 0.004%, so as to accurately control the opening degree of the flow control valve 50. Moreover, this chip has few external devices, simple circuit design, and low cost.

[0034] The pin of the DAC chip U2 is connected to the PB12 pin of the control chip U1 through the first resistor R1. The VoutA pin of the DAC chip U2 is connected to the voltage regulation module 20 through the second resistor R2. The pin of the DAC chip U2 is connected to the PD8 pin of the control chip U1 through the third resistor R3. The DIN pin of the DAC chip U2 is connected to the PB15 pin of the control chip U1 through the fourth resistor R4. The SCLK pin of the DAC chip U2 is connected to the PB13 pin of the control chip U1 through the fifth resistor R5. From the pin of the DAC chip U2, The FOOT, DIN foot, and SCLK foot communicate with the control chip U1, and an analog voltage is output from the VoutA foot to the voltage regulation module.

[0035] Please continue to refer to Figures 3 to 5 , the power management unit 12 includes a power chip U3, a sixth resistor R6, a seventh resistor R7, and a first inductor L1. The power chip U3 can use a DC-DC chip of model TPS54331 DDAR, which is a step-down power chip U3 and can output a stable 12V voltage.

[0036] In this embodiment, the VIN foot of the power chip U3 is connected to the first filtering unit 11, and the first filtering unit 11 filters out power supply noise to make the voltage of the VIN foot input to the power chip U3 stable.

[0037] The EN foot of the power chip U3 is connected to the PD9 foot of the control chip U1 through the sixth resistor R6 and is also grounded through the seventh resistor R7. The sixth resistor R6 and the seventh resistor R7 are a voltage sampling circuit for obtaining the voltage output from the PD9 foot of the control chip U1, and when the voltage is higher than 1.25V, the power chip U3 works.

[0038] The PH foot of the power chip U3 is connected to the first end of the voltage regulation module 20 and the power supply end of the flow control valve 50 through the first inductor L1 to provide a stable 12V power supply for the flow control valve 50. The VSENSE foot of the power chip U3 is connected to the second end of the voltage regulation module 20 to provide a stable reference voltage for the voltage regulation module 20. The third end of the voltage regulation module 20 is connected to the VoutA foot of the DAC chip U2, and the corresponding analog voltage is output from the VoutA foot of the DAC chip U2 to adjust the output voltage of the voltage regulation module 20. This voltage and the 12V voltage together supply power to the flow control valve 50, so as to automatically adjust the opening degree of the flow control valve 50 by changing the output voltage of the voltage regulation module 20, that is, automatically control the air supply flow of the air pump, and the opening degree of the flow control valve 50 can be accurately controlled in cooperation with the voltage output by the DAC chip U2.

[0039] Further, the power management unit 12 further includes a diode D1. The cathode of the diode D1 is connected to the PH foot of the power chip U3, and the anode of the diode D1 is grounded. This diode D1 is a voltage stabilizing diode D1 to make the voltage output from the PH foot of the power chip U3 stable and make the flow control valve 50 work stably.

[0040] Further, the first filtering unit 11 includes a second inductor L2, a first capacitor C1, a second capacitor C2, and a third capacitor C3. The second inductor L2, the first capacitor C1, the second capacitor C2, and the third capacitor C3 form an LC filtering circuit to stabilize the voltage of the VIN pin of the input power supply chip U3 and prevent the spike voltage from damaging the power supply chip U3.

[0041] In this embodiment, one end of the second inductor L2 is connected to the power supply, the other end of the second inductor L2 is connected to the VIN pin of the power supply chip U3, and is also grounded through the first capacitor C1. The second capacitor C2 and the third capacitor C3 are connected in parallel with the first capacitor C1. Of course, the number of capacitors can also be set as needed, and the present invention does not limit this.

[0042] In an alternative embodiment, the flow rate detection module 60 is an electromagnetic proportional valve. Applying a current to the coil of the electromagnetic proportional valve will generate a magnetic field, and when the current is lost, the magnetic force will disappear. Thus, the electromagnetic proportional valve can freely control its opening degree according to the change of the input voltage, so as to control the flow rate and pressure of the air supply pipeline, that is, by changing the magnetic force generated by changing the voltage applied to the coil to move the position of the valve core to control the flow rate of the fluid (i.e., CO2 gas in the pipeline).

[0043] In a specific embodiment, the voltage regulation module 20 includes an eighth resistor R8, a ninth resistor R9, and a tenth resistor R10. One end of the eighth resistor R8 is the 3rd terminal of the voltage regulation module 20, which is connected to the VoutA pin of the DAC chip U2. The VoutA pin of the DAC chip U2 provides a precise external voltage (i.e., the module voltage). The other end of the eighth resistor R8 is the 2nd terminal of the voltage regulation module 20, which is connected to the VSENSE pin of the power supply chip U3, is also connected to the power supply terminal of the flow control valve 50 through the ninth resistor R9, and is also grounded through the tenth resistor R10.

[0044] In this embodiment, the DAC chip provides a precise external voltage for the voltage regulation module 20. The PH pin and the VSENSE pin of the power supply chip U3 are the voltage output terminal and the reference voltage output terminal of the power supply module 10 respectively, and provide voltages for the eighth resistor R8 and the ninth resistor R9 respectively, so as to adjust the working voltage of the flow control valve 50, thereby controlling the magnetic force of the coil of the flow control valve 50 to control the opening degree of the flow control valve 50 for air flow control. The electromagnetic proportional valve of the voltage regulation module 20 is obtained by the following formula:

[0045] V OUT1 = R9[0.8 / R 10 -(V DAC1 -0.8) / R8]

[0046] Wherein, V DAC1 is the output voltage (i.e., analog voltage) of the VoutA pin of the DAC chip U2, R8 is the resistance value of the eighth resistor R8, R9 is the resistance value of the ninth resistor R9, and R 10 is the resistance value of the tenth resistor R10.

[0047] The utility model adjusts the opening degree of the flow control valve 50 by adjusting the supply voltage of the flow control valve 50, thereby controlling the size of the gas flow rate to increase the gas flow rate control accuracy.

[0048] Furthermore, the power management unit 12 further includes an eleventh resistor R11 and a fourth capacitor C4. The eleventh resistor R11 and the fourth capacitor C4 form an RC filter circuit. One end of the eleventh resistor R11 is connected to the PH pin of the power supply chip U3, and the other end of the eleventh resistor R11 is grounded through the fourth capacitor C4. The voltage output by the PH pin of the power supply chip U3 is filtered by the RC filter circuit, stored and boosted by the first inductor L1, and then supplies power to the flow control valve 50.

[0049] The second filtering unit 13 includes a third inductor L3, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, and an eighth capacitor C8. The third inductor L3 is connected in series between the second inductor L2 and the flow control valve 50. One end of the fifth capacitor C5 is connected to the third inductor L3, and the other end of the fifth capacitor C5 is grounded. The sixth capacitor C6, the seventh capacitor C7, and the eighth capacitor C8 are connected in parallel with the fifth capacitor C5.

[0050] The third inductor L3, the fifth capacitor C5, the sixth capacitor C6, the seventh capacitor C7, and the eighth capacitor C8 form an LC circuit. The voltage output by the third inductor L3 is filtered by the fifth capacitor C5, the sixth capacitor C6, the seventh capacitor C7, and the eighth capacitor C8 to stabilize the supply voltage of the flow detection module 60. Of course, the number of capacitors can also be set according to needs, and the utility model does not limit this.

[0051] To better understand the technical solution of the utility model, the following takes an anesthesia machine as an application embodiment and combines Figure 2 and Figure 5 to elaborate in detail on the flow control system of the air pump of the utility model:

[0052] When the endoscope is powered on, the air pump is powered on and starts to supply air. The power supply chip U3 converts the 15V power supply voltage into 12V voltage and outputs it through the PH pin of the power supply chip U3 to supply power to the flow detection module 60. And a stable reference voltage is output from the VSENSE pin of the power supply chip U3 to the voltage regulation module 20. When the air pump is working, the air flow rate of the air pump is obtained by the flow detection module 60 (such as an air flow sensor). At the same time, the air flow sensor will obtain the air flow rate data of the air pump and convert it into a corresponding voltage and feedback it to the control chip U1. The control chip U1 obtains the corresponding air flow rate value according to the voltage converted by the air flow sensor, and outputs a corresponding digital control signal to the pin of the DAC chip U2. And the DAC chip U2 converts the digital signal output by the control chip U1 into a corresponding voltage value. When the voltage converted by the air flow sensor changes, the digital control signal output by the control chip U1 will change accordingly, and the module voltage output by the VoutA pin of the DAC chip U2 will also change accordingly. Thus, the voltage output by the voltage regulation module composed of the eighth resistor R8, the ninth resistor R9, and the tenth resistor R10 changes accordingly. Due to the change in the voltage drop of the ninth resistor R9, after this voltage drop is loaded to the power supply terminal of the flow control valve 50, the working voltage of the flow control valve 50 changes, thereby controlling the movement of the spool of the electromagnetic proportional valve to the corresponding position of the electromagnetic proportional valve, so as to accurately control the opening degree of the electromagnetic proportional valve.

[0053] The utility model adjusts the power of the electromagnetic proportional valve by adjusting the supply voltage of the electromagnetic proportional valve, thereby controlling the air flow rate, and the control precision of the air flow rate is high.

[0054] The utility model also provides an endoscope air supply device, which includes an air pump, an air supply pipeline and a flow control system. The air supply pipeline is connected to the air pump. The flow control system is used to adjust the air flow rate into the human body in real time according to the gas flow rate data in the air supply pipeline. Since the flow control system of the air pump has been described in detail above, it will not be repeated here.

[0055] In summary, the flow control system of the air pump provided by the utility model outputs a digital control signal by the control module, and is converted into an analog voltage by the digital-to-analog conversion module, so that the voltage regulation module outputs a corresponding regulated voltage and loads it to the power supply terminal of the flow control valve. By combining this voltage with the supply voltage of the power supply module, the working voltage of the flow control valve is adjusted, thereby controlling the opening degree of the flow control valve, realizing the automatic adjustment of the air supply flow rate, and having high control precision, improving the intelligent degree of the endoscope air supply device.

[0056] The utility model adopts an electromagnetic proportional valve with adjustable opening and closing size, and adjusts the supply voltage of the electromagnetic proportional valve through the cooperation of an external DAC and a power supply to adjust the opening and closing size of the electromagnetic proportional valve, making the flow control of the electromagnetic proportional valve more accurate.

[0057] It is understandable that for those of ordinary skill in the art, equivalent substitutions or modifications can be made according to the technical solution of the present utility model and its inventive concept, and all such modifications or substitutions shall fall within the protection scope of the claims appended to the present utility model.

Claims

1. A flow control system for an air pump, characterized in that, It includes a power supply module, a flow rate detection module, a voltage regulation module, a digital-to-analog conversion module, a control module, and a flow control valve connected to an air pump. The power supply module supplies power to the flow control valve to open it. The flow rate detection module obtains the air flow rate and feeds it back to the control module. The control module outputs a corresponding digital control signal according to the air flow rate. The digital control signal is converted into an analog voltage by the digital-to-analog conversion module and output to the voltage regulation module. The voltage regulation module outputs a corresponding regulated voltage according to the analog voltage and loads it to the power supply terminal of the flow control valve to control the opening degree of the flow control valve.

2. The flow control system of the air pump according to claim 1, wherein The power supply module outputs a reference voltage to supply power to the voltage regulation module. The voltage regulation module outputs the regulated voltage according to the reference voltage and the analog voltage to adjust the opening degree of the flow control valve.

3. The flow control system of the air pump according to claim 1, wherein The control module includes a control chip. The PD8 pin, PB12 pin, PB13 pin, and PB15 pin of the control chip are connected to the digital-to-analog conversion module. The PD9 pin of the control chip is connected to the power supply module.

4. The flow control system of the air pump according to claim 3, wherein The digital-to-analog conversion module includes a DAC chip, a first resistor, a second resistor, a third resistor, a fourth resistor, and a fifth resistor. The pin of the DAC chip is connected to the PB12 pin of the control chip through the first resistor. The VoutA pin of the DAC chip is connected to the voltage regulation module through the second resistor. The pin of the DAC chip is connected to the PD8 pin of the control chip through the third resistor. The DIN pin of the DAC chip is connected to the PB15 pin of the control chip through the fourth resistor. The SCLK pin of the DAC chip is connected to the PB13 pin of the control chip through the fifth resistor.

5. The flow control system of the air pump according to claim 4, characterized in that, The power supply module includes a first filtering unit and a power management unit. The input end of the first filtering unit is connected to the power supply. The output end of the first filtering unit is connected to the power supply terminals of the control module, the regulation module, and the flow control valve through the power management unit.

6. The flow control system of the air pump according to claim 5, characterized in that, The power management unit includes a power supply chip, a sixth resistor, a seventh resistor, and a first inductor. The VIN pin of the power supply chip is connected to the first filtering unit. The EN pin of the power supply chip is connected to the PD9 pin of the control chip through the sixth resistor and is also grounded through the seventh resistor. The PH pin of the power supply chip is connected to the first end of the voltage regulation module and the power supply terminal of the flow control valve through the first inductor. The VSENSE pin of the power supply chip is connected to the second end of the voltage regulation module. The third end of the voltage regulation module is connected to the VoutA pin of the DAC chip.

7. The flow control system of the air pump according to claim 6, characterized in that, The power management unit further includes a diode. The cathode of the diode is connected to the PH pin of the power supply chip, and the anode of the diode is grounded.

8. The flow control system of the air pump according to claim 6, characterized in that, The voltage regulation module includes an eighth resistor, a ninth resistor, and a tenth resistor. One end of the eighth resistor is connected to the VoutA pin of the DAC chip. The other end of the eighth resistor is connected to the VSENSE pin of the power supply chip, is also connected to the power supply terminal of the flow control valve through the ninth resistor, and is also grounded through the tenth resistor.

9. The flow control system of the air pump according to claim 6, wherein, The first filtering unit includes a second inductor, a first capacitor, a second capacitor, and a third capacitor. One end of the second inductor is connected to the power supply. The other end of the second inductor is connected to the VIN pin of the power supply chip and is also grounded through the first capacitor. The second capacitor and the third capacitor are connected in parallel with the first capacitor.

10. An endoscopic gas supply device, characterized in that, It includes an air pump and a flow control system according to any one of claims 1-9.

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