A method for automatically adjusting oxygen concentration of gas transmission by high-flow equipment

Abstract

The present invention discloses a method for automatically adjusting the oxygen concentration of gas transmission of a high-flow device. The method comprises an MCU microprocessor, a timing circuit, a coupling circuit, a driving circuit, and a proportional valve. The method comprises the following steps: setting a timing circuit so that the timing circuit simultaneously outputs three timing signals and a dual timing signal, and the three timing signals and the dual timing signal have the same period length; connecting the dual timing signal to an I / O acquisition port of the MCU microprocessor, the MCU microprocessor collects infrared light and red light data based on the dual timing signal, and the timing circuit circulates through the dual timing signal; outputting infrared light and red light emitting tube control signals through the three timing signals; and setting a coupling circuit to convert the infrared light and red light signals into voltage signals, and respectively extracting AC and DC components and outputting them to the I / O acquisition port of the MCU microprocessor.

Description

Technical Field

[0001] The present invention relates to the technical field of oxygen flow control for oxygen concentrators, and in particular to a method for automatically adjusting the oxygen concentration of gas delivered by high-flow equipment. Background Art

[0002] Application No. CN202210694367.2 discloses an intelligent ventilator system and control method with a blood oxygen saturation control function. According to the type of symptoms of different patients, the oxygen concentration is automatically adjusted to keep the patient's blood oxygen saturation within an optimal medical range. However, when collecting blood oxygen data, it is necessary to use an H-bridge circuit to perform time-sharing control of red light and infrared light. However, the alternating conduction of red light and infrared light will cause crosstalk, and the control method of the collected signal is to control the I / V conversion module through the MCU to perform gain selection and timing control of the collected light-transmitting signal. When clock offset occurs, the MCU is prone to missed scanning, resulting in deviation in the final adjustment. Summary of the Invention

[0003] In view of the above technical problems, the present invention aims to provide a method for automatically adjusting the oxygen concentration of gas transmission by a high-flow device, comprising an MCU microprocessor, a timing circuit, a coupling circuit, a drive circuit, and a proportional valve. The method for automatically adjusting the oxygen concentration of gas transmission by a high-flow device comprises the following steps:

[0004] The timing circuit is set so that the timing circuit has both triple timing signal and dual timing signal outputs, and the triple timing signal and the dual timing signal have the same period length;

[0005] The dual timing signal is connected to the MCU microprocessor I / O acquisition port. The MCU microprocessor collects infrared light and red light data based on the dual timing signal. The timing circuit circulates through the dual timing signal.

[0006] Output infrared light and red light emitting diode control signals through three timing signals;

[0007] A coupling circuit is set up to convert the infrared light and red light signals into voltage signals and extract the AC and DC components respectively and output them to the I / O acquisition port of the MCU microprocessor;

[0008] Writing Beer's law algorithm into the MCU microprocessor to calculate and output the AC component signal and DC component signal input by the coupling circuit;

[0009] The driving circuit is configured to receive a signal output by the MCU microprocessor to adjust the oxygen flow rate of the proportional valve.

[0010] Furthermore, the timing circuit includes a first MOS transistor Q1, a second MOS transistor Q2, a third transistor Q3, a fourth transistor Q4, a fifth MOS transistor Q5, a sixth MOS transistor Q6, a seventh transistor Q7, an eighth transistor Q8, a ninth phototransistor Q9, a tenth phototransistor Q10, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a first operational amplifier U1, a second operational amplifier U2, a third light-emitting diode U3, a fourth light-emitting diode U4, a fifth light-emitting diode U5, a sixth light-emitting diode U6, a first capacitor C1, a first output terminal OUT1, a second output terminal OUT2, and the first output terminal OUT2. An output end of an operational amplifier U1 is connected to the gate of a first MOS transistor Q1, the gate of a second MOS transistor Q2, and the drain of the second MOS transistor Q2. The source of the first MOS transistor Q1 is connected to one end of a first resistor R1, one end of a second resistor R2, the anode of a third light-emitting diode U3, and the collector of a third transistor Q3. The other end of the first resistor R1 is connected to one end of a third resistor R3 and a power supply. The other end of the third resistor R3 is connected to the collector of a fourth transistor Q4, one end of a fourth resistor R4, and the anode of a sixth light-emitting diode U6. The base of the fourth transistor Q4 is connected to the other end of the second resistor R2. The other end of the fourth resistor R4 is connected to the base of the third transistor Q3. The cathode of the sixth light-emitting diode U6 is connected to the base of the seventh transistor Q7. The collector of the seventh transistor Q7 is connected to one end of the seventh resistor R7, the other end of the seventh resistor R7 is connected to the base of the eighth transistor Q8, the emitter of the eighth transistor Q8 is connected to the power supply, the collector of the eighth transistor Q8 is connected to one end of the sixth resistor R6, the other end of the sixth resistor R6 is connected to one end of the fifth resistor R5, one end of the first capacitor C1, the inverting end of the second operational amplifier U2, and the non-inverting end of the first operational amplifier U1, the output end of the second operational amplifier U2 is connected to the drain of the sixth MOS transistor Q6, the gate of the sixth MOS transistor Q6, and the gate of the fifth MOS transistor Q5, the source of the fifth MOS transistor Q5 is connected to the anode of the sixth light-emitting diode U6, the source of the sixth MOS transistor Q6 is connected to the anode of the fifth light-emitting diode U5, and the seventh The emitter of the transistor Q7, the other end of the first capacitor C1, the cathode of the fifth light-emitting diode U5, the cathode of the fourth light-emitting diode U4, the emitter of the third transistor Q3, the cathode of the third light-emitting diode U3 and the ground terminal are connected, the third light-emitting diode U3 and the ninth phototransistor Q9 are optically coupled and packaged, the sixth light-emitting diode U6 and the tenth phototransistor Q10 are optically coupled and packaged, the collector of the ninth phototransistor Q9 is connected to the power supply, the collector of the tenth phototransistor Q10 is connected to the power supply, the emitter of the ninth phototransistor Q9 is connected to the first output terminal OUT1, the emitter of the tenth phototransistor Q10 is connected to the second output terminal OUT2, and the first output terminal OUT1 and the second output terminal OUT2 are connected to the data acquisition port of the MCU microprocessor.

[0011] Furthermore, the coupling circuit includes an eleventh phototransistor Q11, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a seventh operational amplifier U7, a second capacitor C2, a third capacitor C3, a third output terminal OUT3, and a fourth output terminal OUT4. The eleventh phototransistor Q11 is optically coupled with the fifth light-emitting diode U5 and the fourth light-emitting diode U4. The collector of the eleventh phototransistor Q11 is connected to the power supply. The emitter of the eleventh phototransistor Q11 is connected to one end of the eighth resistor R8, one end of the ninth resistor R9, and the in-phase terminal of the seventh operational amplifier U7. The ninth resistor The other end of R9 is connected to one end of the second capacitor C2 and the third output terminal OUT3, the inverting end of the seventh operational amplifier U7 is connected to one end of the eleventh resistor R11 and one end of the tenth resistor R10, the other end of the tenth resistor R10 is connected to the output end of the seventh operational amplifier U7 and one end of the third capacitor C3, the other end of the third capacitor C3 is connected to the fourth output terminal OUT4 and one end of the twelfth resistor R12, the other end of the twelfth resistor R12, the other end of the eleventh resistor R11, the other end of the second capacitor C2, the other end of the eighth resistor R8 are connected to the ground end, and the third output terminal OUT3 and the fourth output terminal OUT4 are connected to the acquisition port of the MCU microprocessor.

[0012] Furthermore, the driving circuit includes an eighth operational amplifier U8, a twentieth resistor R20, a twenty-first resistor R21, a twenty-second resistor R22, a fourth capacitor C4, a first input terminal IN1, and a fifth output terminal OUT5. The in-phase terminal of the eighth operational amplifier U8 is connected to one end of the twentieth resistor R20 and one end of the fourth capacitor C4, the inverting terminal of the eighth operational amplifier U8 is connected to one end of the twenty-first resistor R21 and one end of the twenty-second resistor R22, the other end of the twenty-second resistor R22 is connected to the output terminal of the eighth operational amplifier U8 and the fifth output terminal OUT5, the fifth output terminal OUT5 is connected to the proportional valve, the other end of the twenty-first resistor R21, the other end of the fourth capacitor C4 are connected to the ground terminal, the other end of the twentieth resistor R20 is connected to the first input terminal IN1, and the first input terminal IN1 is connected to the MCU output port.

[0013] Furthermore, the timing circuit also includes a thirteenth resistor R13 and a fourteenth resistor R14, one end of the thirteenth resistor R13 is connected to the power supply, the other end of the thirteenth resistor R13 is connected to the drain of the fifth MOS tube Q5, the drain of the first MOS tube Q1, and one end of the fourteenth resistor R14, and the other end of the fourteenth resistor R14 is connected to the ground end.

[0014] Furthermore, the timing circuit also includes a fifteenth resistor R15, a sixteenth resistor R16, and a seventeenth resistor R17, one end of the fifteenth resistor R15 is connected to the power supply, the other end of the fifteenth resistor R15 is connected to the inverting end of the first operational amplifier U1 and one end of the sixteenth resistor R16, the other end of the sixteenth resistor R16 is connected to the non-inverting end of the second operational amplifier U2 and one end of the seventeenth resistor R17, and the other end of the seventeenth resistor R17 is connected to the ground end.

[0015] Furthermore, the timing circuit further includes an eighteenth resistor R18 , one end of the eighteenth resistor R18 is connected to the gate of the sixth MOS transistor Q6 , and the other end of the eighteenth resistor R18 is connected to the ground.

[0016] Furthermore, the timing circuit further includes a nineteenth resistor R19, one end of the nineteenth resistor R19 is connected to the gate of the second MOS transistor Q2, and the other end of the nineteenth resistor R19 is connected to the ground end.

[0017] Further, the MCU microprocessor signal is STM32F103, the dual timing signal is respectively connected to the PA0 pin and PA1 pin of STM32F103, the coupling circuit is connected to the PA2 pin and PA3 pin of STM32F103, the driving circuit is connected to the PD0 pin of STM32F103, and 1CLK is connected to the clock signal.

[0018] The beneficial effects of the present invention compared with the prior art are:

[0019] The oxygen flow rate is controlled by the blood oxygen saturation and oxygen flow proportional valve to increase or decrease the oxygen concentration. The timing circuit can realize the three-time control of red light and infrared light at the same time, as well as the control of signal acquisition after light transmission, to avoid alternating crosstalk and missed scanning. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the prior art and the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 and Figure 2 This is a schematic diagram of the timing circuit structure provided by the present invention.

[0022] Figure 3 This is a schematic diagram of the coupling circuit structure provided by the present invention.

[0023] Figure 4 This is a schematic diagram of the driving circuit structure provided by the present invention.

[0024] Figure 5 This is a schematic diagram of the pin connections used by the STM32103 provided by the present invention. DETAILED DESCRIPTION

[0025] In order to make the objects and advantages of the present invention more clearly understood, the present invention is described in detail below with reference to the embodiments. It should be understood that the following text is only used to describe one or several specific implementation methods of the present invention and does not strictly limit the scope of protection specifically requested by the present invention.

[0026] Referring to the accompanying drawings, the present invention is a method for automatically adjusting the oxygen concentration of gas transmission by a high-flow device, comprising an MCU microprocessor, a timing circuit, a coupling circuit, a drive circuit, and a proportional valve. The method for automatically adjusting the oxygen concentration of gas transmission by a high-flow device comprises the following steps:

[0027] The timing circuit is set so that the timing circuit has both triple timing signal and dual timing signal outputs, and the triple timing signal and the dual timing signal have the same period length;

[0028] The dual timing signal is connected to the MCU microprocessor I / O acquisition port. The MCU microprocessor collects infrared light and red light data based on the dual timing signal. The timing circuit circulates through the dual timing signal.

[0029] Output infrared light and red light emitting diode control signals through three timing signals;

[0030] A coupling circuit is set up to convert the infrared light and red light signals into voltage signals and extract the AC and DC components respectively and output them to the I / O acquisition port of the MCU microprocessor;

[0031] Writing Beer's law algorithm into the MCU microprocessor to calculate and output the AC component signal and DC component signal input by the coupling circuit;

[0032] The driving circuit is configured to receive a signal output by the MCU microprocessor to adjust the oxygen flow rate of the proportional valve.

[0033] Specifically, the timing circuit includes a first MOS transistor Q1, a second MOS transistor Q2, a third transistor Q3, a fourth transistor Q4, a fifth MOS transistor Q5, a sixth MOS transistor Q6, a seventh transistor Q7, an eighth transistor Q8, a ninth phototransistor Q9, a tenth phototransistor Q10, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a first operational amplifier U1, a second operational amplifier U2, a third light-emitting diode U3, a fourth light-emitting diode U4, a fifth light-emitting diode U5, a sixth light-emitting diode U6, a first capacitor C1, a first output terminal OUT1, a second output terminal OUT2, and the first operational amplifier U1. The output end of the operational amplifier U1 is connected to the gate of the first MOS transistor Q1, the gate of the second MOS transistor Q2, and the drain of the second MOS transistor Q2. The source of the first MOS transistor Q1 is connected to one end of the first resistor R1, one end of the second resistor R2, the anode of the third light-emitting tube U3, and the collector of the third transistor Q3. The other end of the first resistor R1 is connected to one end of the third resistor R3 and a power supply. The other end of the third resistor R3 is connected to the collector of the fourth transistor Q4, one end of the fourth resistor R4, and the anode of the sixth light-emitting tube U6. The base of the fourth transistor Q4 is connected to the other end of the second resistor R2. The other end of the fourth resistor R4 is connected to the base of the third transistor Q3. The cathode of the sixth light-emitting tube U6 is connected to the base of the seventh transistor Q7. The collector of the transistor Q7 is connected to one end of the seventh resistor R7, the other end of the seventh resistor R7 is connected to the base of the eighth transistor Q8, the emitter of the eighth transistor Q8 is connected to the power supply, the collector of the eighth transistor Q8 is connected to one end of the sixth resistor R6, the other end of the sixth resistor R6 is connected to one end of the fifth resistor R5, one end of the first capacitor C1, the inverting end of the second operational amplifier U2, and the non-inverting end of the first operational amplifier U1, the output end of the second operational amplifier U2 is connected to the drain of the sixth MOS transistor Q6, the gate of the sixth MOS transistor Q6, and the gate of the fifth MOS transistor Q5, the source of the fifth MOS transistor Q5 is connected to the anode of the sixth light-emitting tube U6, the source of the sixth MOS transistor Q6 is connected to the anode of the fifth light-emitting tube U5, and the seventh transistor The emitter of Q7, the other end of the first capacitor C1, the cathode of the fifth light-emitting tube U5, the cathode of the fourth light-emitting tube U4, the emitter of the third transistor Q3, the cathode of the third light-emitting tube U3 and the ground terminal are connected, the third light-emitting tube U3 and the ninth phototransistor Q9 are optically coupled and packaged, the sixth light-emitting tube U6 and the tenth phototransistor Q10 are optically coupled and packaged, the collector of the ninth phototransistor Q9 is connected to the power supply, the collector of the tenth phototransistor Q10 is connected to the power supply, the emitter of the ninth phototransistor Q9 is connected to the first output terminal OUT1, the emitter of the tenth phototransistor Q10 is connected to the second output terminal OUT2, and the first output terminal OUT1 and the second output terminal OUT2 are connected to the data acquisition port of the MCU microprocessor.

[0034] Specifically, the coupling circuit includes an eleventh phototransistor Q11, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a seventh operational amplifier U7, a second capacitor C2, a third capacitor C3, a third output terminal OUT3, and a fourth output terminal OUT4. The eleventh phototransistor Q11 is optically coupled with the fifth light-emitting tube U5 and the fourth light-emitting tube U4. The collector of the eleventh phototransistor Q11 is connected to the power supply. The emitter of the eleventh phototransistor Q11 is connected to one end of the eighth resistor R8, one end of the ninth resistor R9, and the non-inverting terminal of the seventh operational amplifier U7. The ninth resistor The other end of R9 is connected to one end of the second capacitor C2 and the third output terminal OUT3, the inverting end of the seventh operational amplifier U7 is connected to one end of the eleventh resistor R11 and one end of the tenth resistor R10, the other end of the tenth resistor R10 is connected to the output end of the seventh operational amplifier U7 and one end of the third capacitor C3, the other end of the third capacitor C3 is connected to the fourth output terminal OUT4 and one end of the twelfth resistor R12, the other end of the twelfth resistor R12, the other end of the eleventh resistor R11, the other end of the second capacitor C2, the other end of the eighth resistor R8 are connected to the ground end, and the third output terminal OUT3 and the fourth output terminal OUT4 are connected to the acquisition port of the MCU microprocessor.

[0035] Specifically, the driving circuit includes an eighth operational amplifier U8, a twentieth resistor R20, a twenty-first resistor R21, a twenty-second resistor R22, a fourth capacitor C4, a first input terminal IN1, and a fifth output terminal OUT5. The in-phase terminal of the eighth operational amplifier U8 is connected to one end of the twentieth resistor R20 and one end of the fourth capacitor C4, the inverting terminal of the eighth operational amplifier U8 is connected to one end of the twenty-first resistor R21 and one end of the twenty-second resistor R22, the other end of the twenty-second resistor R22 is connected to the output terminal of the eighth operational amplifier U8 and the fifth output terminal OUT5, the fifth output terminal OUT5 is connected to the proportional valve, the other end of the twenty-first resistor R21, the other end of the fourth capacitor C4 are connected to the ground terminal, the other end of the twentieth resistor R20 is connected to the first input terminal IN1, and the first input terminal IN1 is connected to the MCU output port.

[0036] Specifically, the timing circuit also includes a thirteenth resistor R13 and a fourteenth resistor R14, one end of the thirteenth resistor R13 is connected to the power supply, the other end of the thirteenth resistor R13 is connected to the drain of the fifth MOS tube Q5, the drain of the first MOS tube Q1, and one end of the fourteenth resistor R14, and the other end of the fourteenth resistor R14 is connected to the ground end.

[0037] Specifically, the timing circuit also includes a fifteenth resistor R15, a sixteenth resistor R16, and a seventeenth resistor R17. One end of the fifteenth resistor R15 is connected to the power supply, the other end of the fifteenth resistor R15 is connected to the inverting end of the first operational amplifier U1 and one end of the sixteenth resistor R16, the other end of the sixteenth resistor R16 is connected to the non-inverting end of the second operational amplifier U2 and one end of the seventeenth resistor R17, and the other end of the seventeenth resistor R17 is connected to the ground end.

[0038] Specifically, the timing circuit further includes an eighteenth resistor R18 , one end of the eighteenth resistor R18 is connected to the gate of the sixth MOS transistor Q6 , and the other end of the eighteenth resistor R18 is connected to the ground.

[0039] Specifically, the timing circuit further includes a nineteenth resistor R19, one end of the nineteenth resistor R19 is connected to the gate of the second MOS transistor Q2, and the other end of the nineteenth resistor R19 is connected to the ground end.

[0040] Specifically, the MCU microprocessor signal is STM32F103, the dual timing signal is respectively connected to the PA0 pin and PA1 pin of the STM32F103, the coupling circuit is connected to the PA2 pin and PA3 pin of the STM32F103, the drive circuit is connected to the PD0 pin of the STM32F103, and 1CLK is connected to the clock signal.

[0041] The working principle of the present invention is as follows: a threshold signal is set by the inverting terminal of the first operational amplifier U1, and a threshold signal is set by the non-inverting terminal of the second operational amplifier U2. When the first operational amplifier U1 outputs a signal, the first MOS tube Q1 and the second MOS tube Q2 are turned on, and the second MOS tube Q2 is turned on to enable the fourth light-emitting tube U4 to emit a red light signal, occupying the first timing signal of the three timing signals; the first MOS tube Q1 is turned on to enable the third light-emitting tube U3 and the fourth transistor Q4 to be turned on, and the third light-emitting tube U3 is coupled with the ninth photosensitive transistor Q9, occupying the first timing signal in the dual timing and feeding back the signal to the first output terminal OUT1; when the second operational amplifier U2 outputs a signal, the fifth MOS tube Q5 and the sixth MOS tube Q6 are turned on. , the sixth MOS tube Q6 is turned on to make the fifth light-emitting tube U5 emit an infrared light signal, occupying the second timing signal of the three timing signals; the fifth MOS tube Q5 is turned on to make the sixth light-emitting tube U6 and the seventh transistor Q7 be turned on, the sixth light-emitting tube U6 and the tenth photosensitive transistor Q10 are coupled, occupying the second timing signal of the dual timing and feeding back the signal to the second output terminal OUT2; the seventh transistor Q7 is turned on to make the eighth transistor Q8, the seventh resistor R7, the seventh transistor Q7, and the ground terminal form a loop, so that the eighth transistor Q8, the sixth resistor R6, the fifth resistor R5, and the ground terminal form a loop, so that the potential of the first capacitor C1, the inverting terminal of the second operational amplifier U2, and the non-inverting terminal of the first operational amplifier U1 rise, and the first operational amplifier U1 is turned on. The amplifier U1 and the second operational amplifier U2 stop outputting signals, the fifth light-emitting tube U5 and the fourth light-emitting tube U4 are not coupled, and occupy the third timing signal of the three timing signals; when the power is initially turned on, the second operational amplifier U2 outputs a signal to activate the above-mentioned components, and as the second operational amplifier U2 stops outputting, the fifth MOS tube Q5 and the sixth MOS tube Q6 are turned off, and the fifth light-emitting tube U5 stops emitting infrared light; the power supply signal at the end of the third resistor R3 forms a loop through the third resistor R3, the sixth light-emitting tube U6, the seventh transistor Q7, and the ground end, and the sixth light-emitting tube U6 continues to occupy the second timing signal in the dual timing, and the eighth transistor Q8 continues to be turned on, and as the non-inverting end of the first operational amplifier U1 and the second operational amplifier U 2. The inverting terminal and the first capacitor C1 rise, the output signal of the first operational amplifier U1 passes through the above loop, the fourth transistor Q4 is turned on, so that the power signal at the third resistor R3 forms a loop through the fourth transistor Q4 and the ground terminal, the seventh transistor Q7 is turned off, the sixth light-emitting diode U6 stops occupying the second timing signal in the dual timing sequence, and the third light-emitting diode U3 continues to occupy the first timing signal in the dual timing sequence. As the first operational amplifier U1 stops outputting, the first MOS transistor Q1 and the second MOS transistor Q2 are turned off, the fourth light-emitting diode U4 stops emitting the red light signal, the power signal at the first resistor R1 forms a loop through the third light-emitting diode U3 and the ground terminal, and the third light-emitting diode U3 continues to occupy the first timing signal in the dual timing sequence;The control duration of the dual timing signal is consistent with the control duration of the three timing signals. The three timing signals are controlled as follows: the fourth light-emitting tube U4 emits, the fifth light-emitting tube U5 is cut off - the fourth light-emitting tube U4 is cut off, the fifth light-emitting tube U5 is cut off - the fifth light-emitting tube U5 emits, and the fourth light-emitting tube U4 is cut off; the first output terminal OUT1 and the second output terminal OUT2 are connected to the programmable I / O of the MCU microprocessor. The MCU collects the light transmission signals of the red light and the infrared light emitted correspondingly in the above circuit according to the dual timing signals fed back by the first output terminal OUT1 and the second output terminal OUT2. The light transmission collection is performed by the eleventh photosensitive transistor Q11 to collect the light transmission signals of the fifth light-emitting tube U4. The light signals of the light emitting tube U5 and the fourth light emitting tube U4 are amplified by the eleventh phototransistor Q11, converted by the eighth resistor R8, fed back to the ninth resistor R9 and the second capacitor C2 for filtering, filtering out the AC component and extracting the DC component, and fed back to the non-inverting terminal of the seventh operational amplifier U7. The third output terminal OUT3 outputs the DC component signal. The tenth resistor R10 and the eleventh resistor R11 are connected to the inverting terminal of the seventh operational amplifier U7 and grounded. The third capacitor C3 and the twelfth resistor R12 perform filtering, filtering out the DC component and extracting the AC component. The fourth output terminal OUT4 outputs the AC component signal. The output terminal OUT3 and the fourth output terminal OUT4 are connected to the programmable I / O port of the MCU microprocessor; the MCU microprocessor writes a program to calculate the AC component / DC component collected by the first timing signal in the dual timing signal and the AC component / DC component of the second timing signal to obtain a blood oxygen saturation signal for output, and the output signal controls the proportional valve through the drive circuit; the twentieth resistor R20 and the fourth capacitor C4 in the drive circuit integrate the signal input to the drive circuit by the MCU, and the eighth operational amplifier U8 performs corresponding amplification and outputs it to the fifth output terminal OUT5 to control the opening of the proportional valve; the eighteenth resistor R10 integrates the signal input to the drive circuit by the MCU, and the eighth operational amplifier U8 performs corresponding amplification and outputs it to the fifth output terminal OUT5 to control the opening of the proportional valve; ... R18 provides parasitic relief for the fifth and sixth MOS transistors Q5 and Q6, while the nineteenth resistor R19 provides parasitic relief for the first and second MOS transistors Q1 and Q2. The fifteenth, sixteenth, and seventeenth resistors R15, R16, and R17 divide the voltage and provide threshold signals for the inverting terminal of the first operational amplifier U1 and the non-inverting terminal of the second operational amplifier U2. The STM32103 can be replaced with any chip with four or more programmable I / O ports, or directly with a chip with four or more customizable pin functions, to expand the chip selection range. Pin definition functions are prior art and will not be elaborated here.

Claims

1. A method for automatically adjusting the oxygen concentration of gas transmission by high-flow equipment, characterized in that: The method comprises an MCU microprocessor, a timing circuit, a coupling circuit, a drive circuit, and a proportional valve. The method of automatically adjusting the oxygen concentration of the high-flow device includes the following steps: The timing circuit is set so that the timing circuit has both triple timing signal and dual timing signal outputs, and the triple timing signal and the dual timing signal have the same period length; The dual timing signal is connected to the MCU microprocessor I / O acquisition port. The MCU microprocessor collects infrared light and red light data based on the dual timing signal. The timing circuit circulates through the dual timing signal. Output infrared light and red light emitting diode control signals through three timing signals; A coupling circuit is set up to convert the infrared light and red light signals into voltage signals and extract the AC and DC components respectively and output them to the I / O acquisition port of the MCU microprocessor; Writing Beer's law algorithm into the MCU microprocessor to calculate and output the AC component signal and DC component signal input by the coupling circuit; A driving circuit is configured to receive a signal output by an MCU microprocessor to adjust the oxygen flow rate of the proportional valve; an output end of a first operational amplifier is connected to a gate of a first MOS tube, a gate of a second MOS tube, and a drain of a second MOS tube; a source of the first MOS tube is connected to one end of a first resistor, one end of a second resistor, an anode of a third light-emitting tube, and a collector of a third transistor; the other end of the first resistor is connected to one end of the third resistor and a power supply; the other end of the third resistor is connected to the collector of a fourth transistor, one end of a fourth resistor, and an anode of a sixth light-emitting tube; the base of the fourth transistor is connected to the other end of the second resistor; the other end of the fourth resistor is connected to the base of the third transistor; the cathode of the sixth light-emitting tube is connected to the base of the seventh transistor; the collector of the seventh transistor is connected to one end of the seventh resistor; the other end of the seventh resistor is connected to the base of the eighth transistor; the emitter of the eighth transistor is connected to the power supply; the collector of the eighth transistor is connected to one end of the sixth resistor; the other end of the sixth resistor is connected to one end of the fifth resistor, one end of the first capacitor, an inverting end of the second operational amplifier, and a non-inverting end of the first operational amplifier; the output end of the second operational amplifier is connected to the drain of the sixth MOS tube, the The gate of the sixth MOS tube and the gate of the fifth MOS tube are connected, the source of the fifth MOS tube and the anode of the sixth light-emitting tube are connected, the source of the sixth MOS tube and the anode of the fifth light-emitting tube are connected, the emitter of the seventh transistor, the other end of the first capacitor, the cathode of the fifth light-emitting tube, the cathode of the fourth light-emitting tube, the emitter of the third transistor, the cathode of the third light-emitting tube and the ground are connected; the eleventh phototransistor is optically coupled with the fifth light-emitting tube and the fourth light-emitting tube, the collector of the eleventh phototransistor is connected to the power supply, the emitter of the eleventh phototransistor is connected to one end of the eighth resistor, one end of the ninth resistor, and the non-inverting end of the seventh operational amplifier, the other end of the ninth resistor is connected to one end of the second capacitor and the third output end, the inverting end of the seventh operational amplifier is connected to one end of the eleventh resistor and one end of the tenth resistor, the other end of the tenth resistor is connected to the output end of the seventh operational amplifier and one end of the third capacitor, the other end of the third capacitor is connected to the fourth output end and one end of the twelfth resistor, the other end of the twelfth resistor, the other end of the eleventh resistor, the other end of the second capacitor, and the other end of the eighth resistor are connected to the ground, and the third output end and the fourth output end are connected to the data acquisition port of the MCU microprocessor.

2. The method for automatically adjusting the oxygen concentration of gas transmission by high flow equipment according to claim 1, characterized in that: The driving circuit includes an eighth operational amplifier, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a fourth capacitor, a first input terminal, and a fifth output terminal. The non-inverting terminal of the eighth operational amplifier is connected to one end of the twentieth resistor and one end of the fourth capacitor. The inverting terminal of the eighth operational amplifier is connected to one end of the twenty-first resistor and one end of the twenty-second resistor. The other end of the twenty-second resistor is connected to the output terminal of the eighth operational amplifier and the fifth output terminal. The fifth output terminal is connected to the proportional valve. The other end of the twenty-first resistor, the other end of the fourth capacitor are connected to the ground terminal. The other end of the twentieth resistor is connected to the first input terminal, and the first input terminal is connected to the output port of the MCU.

3. The method for automatically adjusting the oxygen concentration of gas transmission by high flow equipment according to claim 1, characterized in that: The timing circuit also includes a thirteenth resistor and a fourteenth resistor, one end of the thirteenth resistor is connected to the power supply, the other end of the thirteenth resistor is connected to the drain of the fifth MOS tube, the drain of the first MOS tube, and one end of the fourteenth resistor, and the other end of the fourteenth resistor is connected to the ground end.

4. The method for automatically adjusting the oxygen concentration of gas transmission by high flow equipment according to claim 1, characterized in that: The timing circuit also includes a fifteenth resistor, a sixteenth resistor, and a seventeenth resistor, one end of the fifteenth resistor is connected to the power supply, the other end of the fifteenth resistor is connected to the inverting end of the first operational amplifier and one end of the sixteenth resistor, the other end of the sixteenth resistor is connected to the non-inverting end of the second operational amplifier and one end of the seventeenth resistor, and the other end of the seventeenth resistor is connected to the ground end.

5. The method for automatically adjusting the oxygen concentration of gas transmission by high flow equipment according to claim 1, characterized in that: The timing circuit further includes an eighteenth resistor, one end of the eighteenth resistor is connected to the gate of the sixth MOS tube, and the other end of the eighteenth resistor is connected to the ground end.

6. The method for automatically adjusting the oxygen concentration of gas transmission by high flow equipment according to claim 1, characterized in that: The timing circuit further includes a nineteenth resistor, one end of the nineteenth resistor is connected to the gate of the second MOS tube, and the other end of the nineteenth resistor is connected to the ground end.

7. The method for automatically adjusting the oxygen concentration of gas transmission by high flow equipment according to claim 1, characterized in that: The MCU microprocessor signal is STM32F103, the dual timing signal is respectively connected to the PA0 pin and PA1 pin of the STM32F103, the coupling circuit is connected to the PA2 pin and PA3 pin of the STM32F103, the driving circuit is connected to the PD0 pin of the STM32F103, and 1CLK is connected to the clock signal.

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