Self-checking circuit of intelligent respirator

Abstract

The application discloses a kind of intelligent respirator self-checking circuits, it is related to intelligent respirator self-checking technical field, including first resistance, second resistance, third resistance, sixth resistance, thirteenth resistance, fifteenth resistance, twenty-seventh resistance, first operational amplifier, first MOS tube, third triode, first connector, fifth connector, first light emitting diode, the present application can be in the initial opening of respirator to its oxygen supply response self-checking, and when oxygen supply response reaches standard, based on the required oxygen supply flow of patient to the respirator is automatically regulated to prevent the oxygen supply pressure variation caused by different oxygen supply end oxygen supply time length or replacement oxygen supply end makes the oxygen intake in respirator mask different.

Description

Technical Field

[0001] This invention relates to the field of intelligent respirator self-testing technology, and in particular to an intelligent respirator self-testing circuit. Background Technology

[0002] As a crucial medical device for treating respiratory diseases, a ventilator assists and controls a patient's spontaneous breathing. This helps alleviate breathing difficulties and promotes the recovery of respiratory function. The ventilator's oxygen delivery response speed and appropriate oxygen flow rate are key factors in ensuring that patients receive timely and correct assistance within the golden rescue time. Therefore, before interventional treatment, the ventilator needs to undergo self-testing to ensure its stable and reliable operation. This paper proposes an intelligent ventilator self-testing circuit that can self-test the ventilator's oxygen delivery response time and automatically adjust the ventilator based on the patient's required oxygen flow rate. Summary of the Invention

[0003] To address the aforementioned technical problems, the present invention aims to provide a self-test circuit for an intelligent respirator, comprising a first resistor R1, a second resistor R2, a third resistor R3, a sixth resistor R6, a thirteenth resistor R13, a fifteenth resistor R15, a twenty-seventh resistor R27, a first operational amplifier U1, a first MOSFET Q1, a third transistor Q3, a first connector P1, a fifth connector P5, and a first light-emitting diode D1. One end of the first resistor R1, one end of the thirteenth resistor R13, and one end of the fifteenth resistor R15 are connected to a power supply. The other end of the first resistor R1, one end of the second resistor R2, and the drain of the first MOSFET Q1 are connected. The gate of the first MOSFET Q1 is connected to the first connector P1. The source of the first MOSFET Q1 is connected to one end of the third resistor R3. The other end of the third resistor R3 is connected to the non-inverting input of the first operational amplifier U1. The inverting input of the first operational amplifier U1 is connected to one end of the sixth resistor R6 and the other end of the fifteenth resistor R15. The output of the first operational amplifier U1 is connected to the base of the third transistor Q3. The collector of the third transistor Q3 is connected to the cathode of the first light-emitting diode D1. The anode of the first light-emitting diode D1 is connected to the other end of the thirteenth resistor R13. The emitter of the third transistor Q3 is connected to one end of the twenty-seventh resistor R27 and the fifth connector P5. The other ends of the second resistor R2, the sixth resistor R6, and the twenty-seventh resistor R27 are connected to the ground terminal.

[0004] Furthermore, it also includes a fifth resistor R5, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a twentieth resistor R20, a seventh operational amplifier U7, a second MOSFET Q2, a sixth MOSFET Q6, a seventh MOSFET Q7, a second connector P2, a first capacitor C1, and a second capacitor C2. The drain of the second MOSFET Q2 is connected to the non-inverting input of the first operational amplifier U1 and one end of the first capacitor C1. The gate of the second MOSFET Q2 is connected to one end of the fifth resistor R5, the gate of the seventh MOSFET Q7, and the second connector P2. One end of the sixteenth resistor R16 is connected to the power supply, and the other end of the sixteenth resistor R16 is connected to the seventeenth resistor R20. One end of resistor R17 is connected to the source of the sixth MOSFET Q6. The gate of the sixth MOSFET Q6 is connected to the first connector P1. The drain of the sixth MOSFET Q6 is connected to the drain of the seventh MOSFET Q7 and one end of the second capacitor C2. The source of the seventh MOSFET Q7 is connected to one end of the eighteenth resistor R18 and the inverting input of the seventh operational amplifier U7. The non-inverting input of the seventh operational amplifier U7 and one end of the twentieth resistor R20 are connected. The other end of the fifth resistor R5, the other end of the seventeenth resistor R17, the other end of the eighteenth resistor R18, the other end of the twentieth resistor R20, the other end of the first capacitor C1, the other end of the second capacitor C2, the source of the second MOSFET Q2, and the ground terminal are connected.

[0005] Furthermore, it also includes a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a second operational amplifier U2, a fifth operational amplifier U5, and a sixth operational amplifier U6. The non-inverting input of the fifth operational amplifier U5 is connected to the inverting input of the first operational amplifier U1. The inverting input of the fifth operational amplifier U5 is connected to one end of the seventh resistor R7. The output terminal of the fifth operational amplifier U5 is connected to the other end of the seventh resistor R7 and one end of the eighth resistor R8. The second operational amplifier U2... The non-inverting input of the second operational amplifier U2 is connected to one end of the tenth resistor R10. The inverting input of the second operational amplifier U2 is connected to the other end of the eighth resistor R8 and one end of the ninth resistor R9. The output of the second operational amplifier U2 is connected to the other end of the ninth resistor R9 and one end of the twelfth resistor R12. The inverting input of the sixth operational amplifier U6 is connected to one end of the eleventh resistor R11 and the other end of the twelfth resistor R12. The output of the sixth operational amplifier U6 is connected to the other end of the eleventh resistor R11. The other end of the tenth resistor R10, the non-inverting input of the sixth operational amplifier U6, and the ground terminal are connected.

[0006] Furthermore, it also includes a fourteenth resistor R14, a twenty-sixth resistor R26, a third operational amplifier U3, a fourth transistor Q4, a fifth MOSFET Q5, a third connector P3, and a second light-emitting diode D2. The anode of the second light-emitting diode D2 is connected to the anode of the first light-emitting diode D1. The cathode of the second light-emitting diode D2 is connected to the collector of the fourth transistor Q4. The emitter of the fourth transistor Q4 is connected to one end of the twenty-sixth resistor R26. The base of the fourth transistor Q4 is connected to the output terminal of the third operational amplifier U3. The non-inverting input of the third operational amplifier U3 is connected to one end of the fourteenth resistor R14 and the drain of the fifth MOSFET Q5. The inverting input of the third operational amplifier U3 is connected to the output terminal of the sixth operational amplifier U6. The gate of the fifth MOSFET Q5 is connected to the output terminal of the seventh operational amplifier U7. The source of the fifth MOSFET Q5 is connected to the third connector P3. The other end of the fourteenth resistor R14 and the other end of the twenty-sixth resistor R26 are connected to the ground terminal.

[0007] Furthermore, it also includes resistors R21 (21st), R23 (23rd), R24 (24th), R25 (25th), operational amplifier U4 (4th), MOSFET Q8 (8th), MOSFET Q9 (9th), connector P4 (4th), terminal P6 (6th), capacitor C3 (3rd), and LED D3 (3rd). One end of resistor R21 is connected to the drain of MOSFET Q8 and connector P4. The gates of MOSFET Q8 and Q9, the base of transistor Q4, and one end of capacitor C3 are connected. The source of MOSFET Q8 and the drain of MOSFET Q9 are connected. Connect one end of the 24th resistor R24 ​​and one end of the 25th resistor R25. Connect the source of the 9th MOSFET Q9 and the anode of the 3rd LED D3, and the 6th connection terminal P6. Connect the output terminal of the 4th operational amplifier U4 and the other end of the 25th resistor R25. Connect the inverting input of the 4th operational amplifier U4 and the drain of the 7th MOSFET Q7. Connect the non-inverting input of the 4th operational amplifier U4 and one end of the 23rd resistor R23. Connect the other end of the 21st resistor R21, the other end of the 23rd resistor R23, the other end of the 24th resistor R24, the other end of the 3rd capacitor C3, the cathode of the 3rd LED D3, and the ground terminal.

[0008] Furthermore, it also includes a fourth resistor R4, one end of which is connected to the gate of the first MOS transistor Q1, and the other end of which is connected to the ground terminal.

[0009] Furthermore, it also includes a nineteenth resistor R19, one end of which is connected to the gate of the fifth MOS transistor Q5, and the other end of which is connected to the ground terminal.

[0010] Furthermore, it also includes a 22nd resistor R22, one end of which is connected to the gate of the 8th MOS transistor Q8, and the other end of which is connected to the ground terminal.

[0011] The beneficial effects of this invention compared to the prior art are:

[0012] This invention can perform a self-check on the oxygen supply response when the ventilator is initially turned on, and automatically adjust the ventilator based on the patient's required oxygen flow rate when the oxygen supply response meets the standard, so as to prevent the oxygen supply volume in the ventilator mask from being different due to different oxygen supply time at the oxygen supply end or changes in oxygen supply pressure caused by changing the oxygen supply end. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the prior art and embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 The self-test circuit structure diagram provided by the present invention. Detailed Implementation

[0015] To make the objectives and advantages of the present invention clearer, the present invention will be specifically described below in conjunction with embodiments. It should be understood that the following text is only used to describe one or more specific embodiments of the present invention and does not strictly limit the scope of protection specifically claimed by the present invention.

[0016] This invention discloses a self-test circuit for an intelligent respirator, including a first resistor R1, a second resistor R2, a third resistor R3, a sixth resistor R6, a thirteenth resistor R13, a fifteenth resistor R15, a twenty-seventh resistor R27, a first operational amplifier U1, a first MOSFET Q1, a third transistor Q3, a first connector P1, a fifth connector P5, and a first light-emitting diode D1. One end of the first resistor R1, one end of the thirteenth resistor R13, and one end of the fifteenth resistor R15 are connected to a power supply. The other end of the first resistor R1, one end of the second resistor R2, and the drain of the first MOSFET Q1 are connected. The gate of the first MOSFET Q1 is connected to the first connector P1. The source of transistor Q1 is connected to one end of the third resistor R3. The other end of the third resistor R3 is connected to the non-inverting input of the first operational amplifier U1. The inverting input of the first operational amplifier U1 is connected to one end of the sixth resistor R6 and the other end of the fifteenth resistor R15. The output of the first operational amplifier U1 is connected to the base of the third transistor Q3. The collector of the third transistor Q3 is connected to the cathode of the first light-emitting diode D1. The anode of the first light-emitting diode D1 is connected to the other end of the thirteenth resistor R13. The emitter of the third transistor Q3 is connected to one end of the twenty-seventh resistor R27 and the fifth connector P5. The other ends of the second resistor R2, the sixth resistor R6, and the twenty-seventh resistor R27 are connected to the ground terminal.

[0017] Specifically, it also includes the fifth resistor R5, the sixteenth resistor R16, the seventeenth resistor R17, the eighteenth resistor R18, the twentieth resistor R20, the seventh operational amplifier U7, the second MOSFET Q2, the sixth MOSFET Q6, the seventh MOSFET Q7, the second connector P2, the first capacitor C1, and the second capacitor C2. The drain of the second MOSFET Q2 is connected to the non-inverting input of the first operational amplifier U1 and one end of the first capacitor C1. The gate of the second MOSFET Q2 is connected to one end of the fifth resistor R5, the gate of the seventh MOSFET Q7, and the second connector P2. One end of the sixteenth resistor R16 is connected to the power supply, and the other end of the sixteenth resistor R16 is connected to the seventeenth resistor R20. One end of resistor R17 is connected to the source of the sixth MOSFET Q6. The gate of the sixth MOSFET Q6 is connected to the first connector P1. The drain of the sixth MOSFET Q6 is connected to the drain of the seventh MOSFET Q7 and one end of the second capacitor C2. The source of the seventh MOSFET Q7 is connected to one end of the eighteenth resistor R18 and the inverting input of the seventh operational amplifier U7. The non-inverting input of the seventh operational amplifier U7 and one end of the twentieth resistor R20 are connected. The other end of the fifth resistor R5, the other end of the seventeenth resistor R17, the other end of the eighteenth resistor R18, the other end of the twentieth resistor R20, the other end of the first capacitor C1, the other end of the second capacitor C2, the source of the second MOSFET Q2, and the ground terminal are connected.

[0018] Specifically, it also includes a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a second operational amplifier U2, a fifth operational amplifier U5, and a sixth operational amplifier U6. The non-inverting input of the fifth operational amplifier U5 is connected to the inverting input of the first operational amplifier U1. The inverting input of the fifth operational amplifier U5 is connected to one end of the seventh resistor R7. The output terminal of the fifth operational amplifier U5 is connected to the other end of the seventh resistor R7 and one end of the eighth resistor R8. The second operational amplifier U2... The non-inverting input of the second operational amplifier U2 is connected to one end of the tenth resistor R10. The inverting input of the second operational amplifier U2 is connected to the other end of the eighth resistor R8 and one end of the ninth resistor R9. The output of the second operational amplifier U2 is connected to the other end of the ninth resistor R9 and one end of the twelfth resistor R12. The inverting input of the sixth operational amplifier U6 is connected to one end of the eleventh resistor R11 and the other end of the twelfth resistor R12. The output of the sixth operational amplifier U6 is connected to the other end of the eleventh resistor R11. The other end of the tenth resistor R10, the non-inverting input of the sixth operational amplifier U6, and the ground terminal are connected.

[0019] Specifically, it also includes the fourteenth resistor R14, the twenty-sixth resistor R26, the third operational amplifier U3, the fourth transistor Q4, the fifth MOSFET Q5, the third connector P3, and the second light-emitting diode D2. The anode of the second light-emitting diode D2 is connected to the anode of the first light-emitting diode D1. The cathode of the second light-emitting diode D2 is connected to the collector of the fourth transistor Q4. The emitter of the fourth transistor Q4 is connected to one end of the twenty-sixth resistor R26. The base of the fourth transistor Q4 is connected to the output terminal of the third operational amplifier U3. The non-inverting input of the third operational amplifier U3 is connected to one end of the fourteenth resistor R14 and the drain of the fifth MOSFET Q5. The inverting input of the third operational amplifier U3 is connected to the output terminal of the sixth operational amplifier U6. The gate of the fifth MOSFET Q5 is connected to the output terminal of the seventh operational amplifier U7. The source of the fifth MOSFET Q5 is connected to the third connector P3. The other end of the fourteenth resistor R14 and the other end of the twenty-sixth resistor R26 are connected to the ground terminal.

[0020] Specifically, it also includes the twenty-first resistor R21, the twenty-third resistor R23, the twenty-fourth resistor R24, the twenty-fifth resistor R25, the fourth operational amplifier U4, the eighth MOSFET Q8, the ninth MOSFET Q9, the fourth connector P4, the sixth connection terminal P6, the third capacitor C3, and the third light-emitting diode D3. One end of the twenty-first resistor R21 is connected to the drain of the eighth MOSFET Q8 and the fourth connector P4. The gate of the eighth MOSFET Q8 is connected to the gate of the ninth MOSFET Q9, the base of the fourth transistor Q4, and one end of the third capacitor C3. The source of the eighth MOSFET Q8 and the drain of the ninth MOSFET Q9 are connected. Connect one end of the 24th resistor R24 ​​and one end of the 25th resistor R25. Connect the source of the 9th MOSFET Q9 and the anode of the 3rd LED D3, and the 6th connection terminal P6. Connect the output terminal of the 4th operational amplifier U4 and the other end of the 25th resistor R25. Connect the inverting input of the 4th operational amplifier U4 and the drain of the 7th MOSFET Q7. Connect the non-inverting input of the 4th operational amplifier U4 and one end of the 23rd resistor R23. Connect the other end of the 21st resistor R21, the other end of the 23rd resistor R23, the other end of the 24th resistor R24, the other end of the 3rd capacitor C3, the cathode of the 3rd LED D3, and the ground terminal.

[0021] Specifically, it also includes a fourth resistor R4, one end of which is connected to the gate of the first MOS transistor Q1, and the other end of which is connected to the ground terminal.

[0022] Specifically, it also includes a nineteenth resistor R19, one end of which is connected to the gate of the fifth MOS transistor Q5, and the other end of which is connected to the ground terminal.

[0023] Specifically, it also includes a 22nd resistor R22, one end of which is connected to the gate of the 8th MOS transistor Q8, and the other end of which is connected to the ground terminal.

[0024] Referring to the accompanying drawings, in this embodiment, the power signal passes through the first resistor R1 and the second resistor R2 to the grounding circuit, and the power signal passes through the fifteenth resistor R15 and the sixth resistor R6 to the grounding circuit. The signal at the sixth resistor R6 is fed back to the inverting input of the first operational amplifier U1. When the respirator is in use, a manual feedback signal is sent to the respirator. Simultaneously, the respirator sends a self-test signal to the self-test circuit. The self-test signal is fed back to the gate of the first MOSFET Q1 through the first connector P1. The fourth resistor R4 is used to discharge the parasitic capacitance of the gate of the first MOSFET Q1. When the voltage difference between the gate and source of the first MOSFET Q1 is higher than the conduction threshold, the first MOSFET Q1 is turned on. The signal at the second resistor R2 passes through the drain and source of the first MOSFET Q1 and the third resistor R3 before being fed back to the non-inverting input of the first operational amplifier U1. At the same time, the potential of the first capacitor C1 rises. The response time is adjusted by setting the capacitance value of the first capacitor C1. When the self-test circuit receives the self-test signal and the respirator is not in operation... When the response time is set so that oxygen is supplied to the respirator mask, the first operational amplifier U1 outputs. The signal from the output of the first operational amplifier U1 passes through the base and emitter of the third transistor Q3, the twenty-seventh resistor R27, and then to the ground circuit. The base and emitter of the third transistor Q3 are forward biased, and the third transistor Q3 is turned on. The power signal passes through the thirteenth resistor R13, the first light-emitting diode D1, the collector and emitter of the third transistor Q3, the twenty-seventh resistor R27, and then to the ground circuit. The first light-emitting diode D1 is turned on, and its conduction indicates a respirator oxygen supply failure. At the same time, the signal from the twenty-seventh resistor R27 is fed back to the respirator through the fifth connector P5. The signal from the fifth connector P5 is an oxygen supply shutdown signal. After receiving the feedback signal from the fifth connector P5, the respirator closes the oxygen supply channel, causing the first light-emitting diode D1 to remain lit as an alarm after the response timeout. This serves as a self-check of the oxygen supply response when the respirator is initially turned on.

[0025] Referring to the accompanying drawings, in this embodiment, the power signal passes through the sixteenth resistor R16 and the seventeenth resistor R17 to the grounding circuit. The signal at the seventeenth resistor R17 passes through the source and drain of the sixth MOSFET Q6, causing the potential of the second capacitor C2 to rise. The signal from the first connector P1 is synchronously fed back to the gate of the sixth MOSFET Q6. The voltage difference between the gate and source of the sixth MOSFET Q6 is higher than the conduction threshold, so the sixth MOSFET Q6 is turned off. When the respirator starts supplying oxygen within the set time, the oxygen supply start signal is fed back to the gate of the second MOSFET Q2 on the self-test circuit through the second connector P2. The voltage difference between the gate and source of the second MOSFET Q2 is higher than the conduction threshold, so the second MOSFET Q2 is turned on. The signal at the non-inverting input of the first operational amplifier U1 passes through the drain of the second MOSFET Q2 and the second MOSFET Q2... The source-to-ground circuit is established, and simultaneously, the signal from the second connector P2 is fed back to the gate of the seventh MOSFET Q7. When the voltage difference between the gate and source of the seventh MOSFET Q7 exceeds the conduction threshold, the seventh MOSFET Q7 conducts, and the potential of the second capacitor C2 decreases. The potential drop time of the second capacitor C2 can be adjusted by changing its capacitance value. Based on different patient conditions, the capacitance value of the second capacitor C2 can be set as needed to adjust the single oxygen supply time. The signal from the second capacitor C2 terminal passes through the drain of the seventh MOSFET Q7, the source of the seventh MOSFET Q7, and the eighteenth resistor R18 to the ground circuit. The signal from the eighteenth resistor R18 terminal is fed back to the inverting input of the seventh operational amplifier U7. The twentieth resistor R20 is a pull-down resistor for the non-inverting input of the seventh operational amplifier U7, and the seventh operational amplifier U7 is turned off. When the oxygen supply response meets the standard, the oxygen supply flow rate is detected.

[0026] Referring to the accompanying drawings, in this embodiment, the signal at the sixth resistor R6 is fed back to the non-inverting input of the fifth operational amplifier U5. The output of the fifth operational amplifier U5 is negatively fed back through the seventh resistor R7 and the inverting input of the fifth operational amplifier U5. The total oxygen flow rate per minute is set by adjusting the value of the ninth resistor R9, and the number of oxygen inlets per minute is set by adjusting the value of the eighth resistor R8. The values ​​of the ninth resistor R9 and the eighth resistor R8 are adjusted as needed according to the patient's condition. The tenth resistor R10 is a pull-down circuit for the non-inverting input of the second operational amplifier U2. The output of the second operational amplifier U2 is negatively fed back through the ninth resistor R9 and the inverting input of the second operational amplifier U2. Simultaneously, the signal at the output of the fifth operational amplifier U5 is fed back to the second operational amplifier U2 via the eighth resistor R8. The inverting input of amplifier U2 and the output of the sixth resistor R6 are connected to the inverting input of the sixth operational amplifier U6 via the eleventh resistor R11 for negative feedback. The signal from the output of the second operational amplifier U2 is fed back to the inverting input of the sixth operational amplifier U6 via the twelfth resistor R12, making the amplitude of the signal at the output of the sixth operational amplifier U6 the ratio of the resistances of the ninth resistor R9 and the eighth resistor R8. The flow sensor feeds back the actual oxygen flow rate signal inside the respirator mask to the third connector P3 on the self-test circuit. When the respirator supplies oxygen, the oxygen from the supply end goes through the oxygen supply channel and the one-way inlet valve into the respirator mask. Initially, the one-way inlet valve is at its minimum opening, and the initial opening value is set on the ventilator. When the third connector P3 receives a signal feedback, the third connector P3... The signal passes through the source and drain of the fifth MOSFET Q5, and the fourteenth resistor R14 to the ground circuit. The output signal of the sixth operational amplifier U6 is fed back to the inverting input of the third operational amplifier U3. When the actual oxygen flow rate is lower than the required oxygen flow rate for a single cycle, the third operational amplifier U3 is turned off. The output signal of the third operational amplifier U3 is synchronously fed back to the gate of the eighth MOSFET Q8. When the voltage difference between the gate and source of the eighth MOSFET Q8 is lower than the conduction threshold, the eighth MOSFET Q8 is turned on. The signal at the second capacitor C2 is synchronously fed back to the inverting input of the fourth operational amplifier U4. The twenty-third resistor R23 is a pull-down resistor for the non-inverting input of the fourth operational amplifier U4. When the potential of the second capacitor C2 drops to zero potential... At this time, the fourth operational amplifier U4 outputs, the seventh operational amplifier U7 outputs, and the signal from the output of the seventh operational amplifier U7 is fed back to the gate of the fifth MOSFET Q5. The nineteenth resistor R19 is used to discharge the parasitic capacitance of the gate of the fifth MOSFET Q5. When the voltage difference between the gate and source of the fifth MOSFET Q5 is higher than the conduction threshold, the fifth MOSFET Q5 is turned off. The signal from the output of the fourth operational amplifier U4 passes through the twenty-fifth resistor R25 and the twenty-fourth resistor R24 ​​to the ground circuit. The signal from the twenty-fourth resistor R24 ​​passes through the source and drain of the eighth MOSFET Q8 and the twenty-first resistor R21 to the ground circuit. The signal from the twenty-first resistor R21 is fed back to the respirator through the fourth connector P4.When the ventilator receives a signal feedback from the fourth connector P4, it shuts off and adjusts the opening value of the one-way inlet valve. Once the one-way inlet valve opening value adjustment is complete, the ventilator restarts, simultaneously sending a self-test signal. This automatic adjustment prevents variations in oxygen supply volume within the ventilator mask caused by differences in oxygen supply duration or pressure changes due to switching oxygen supply terminals, even when the oxygen supply response is within acceptable limits and the flow rate is lower than the patient's required flow rate.

[0027] Referring to the accompanying drawings, in this embodiment, when the actual oxygen flow rate is higher than the required oxygen flow rate for a single cycle, the third operational amplifier U3 outputs, the eighth MOSFET Q8 is cut off, the potential of the third capacitor C3 rises, and the signal from the output of the third operational amplifier U3 passes through the base and emitter of the fourth transistor Q4, the twenty-sixth resistor R26, and then to the ground circuit. The base and emitter of the fourth transistor Q4 are forward biased, and the fourth transistor Q4 is turned on. The power signal passes through the thirteenth resistor R13, the second LED D2, the collector and emitter of the fourth transistor Q4, the twenty-sixth resistor R26, and then to the ground circuit. The second LED D2 is turned on, and the conduction of the second LED D2 indicates that the oxygen flow rate of the respirator is normal. At the same time, the signal from the output of the third operational amplifier U3 is fed back to the gate of the ninth MOSFET Q9. The twenty-second resistor R22 is used to discharge the parasitic capacitance of the gates of the eighth MOSFET Q8 and the ninth MOSFET Q9. When the voltage difference between the source and the second capacitor C2 exceeds the conduction threshold, the second capacitor C2 turns on. When the voltage difference between the second capacitor C2 and the source exceeds the conduction threshold, the fourth operational amplifier U4 outputs. The signal from the twenty-fourth resistor R24 ​​passes through the drain and source of the second capacitor Q9, and the third LED D3 to the ground circuit. The third LED D3 turns on, indicating that the self-test is complete. At the same time, the signal from the source of the second capacitor Q9 is fed back to the respirator through the sixth connection terminal P6. When the respirator receives the signal feedback from the sixth connection terminal P6, it stops feeding back the self-test signal and the oxygen supply start signal. When the voltage difference between the second capacitor C2 and the source exceeds the threshold, the third operational amplifier U3 turns off, and the voltage difference between the second capacitor C3 and the source exceeds the threshold. When the voltage difference between the second capacitor C3 and the source exceeds the threshold, the eighth MOSFET Q8 turns on. When the respirator is finished using the equipment, it automatically feeds back a reset signal to the respirator, which resets the one-way air intake valve. This stops the respirator from feeding back the signal to the self-test circuit after the adjustment is completed.

[0028] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No markings in the claims should be construed as limiting the scope of the claims.

Claims

1. A self-test circuit for an intelligent respirator, characterized in that, The system includes a first resistor, a second resistor, a third resistor, a sixth resistor, a thirteenth resistor, a fifteenth resistor, a twenty-seventh resistor, a first operational amplifier, a first MOSFET, a third transistor, a first connector, a fifth connector, a first light-emitting diode (LED), a first capacitor, a second connector, a second MOSFET, and a fourth resistor. One end of the first resistor, one end of the thirteenth resistor, and one end of the fifteenth resistor are connected to the power supply. The other end of the first resistor, one end of the second resistor, and the drain of the first MOSFET are connected. The gate of the first MOSFET is connected to the first connector. The source of the first MOSFET is connected to one end of the third resistor. The other end of the third resistor is connected to the non-inverting input of the first operational amplifier. The inverting input of the first operational amplifier is connected to one end of the sixth resistor and the other end of the fifteenth resistor. The output of the first operational amplifier is connected to the base of the third transistor. The collector of the third transistor is connected to the first LED. The diode cathode is connected, the anode of the first light-emitting diode is connected to the other end of the thirteenth resistor, the emitter of the third transistor and one end of the twenty-seventh resistor are connected to the fifth connector, the other ends of the second resistor, the other ends of the sixth resistor, the other ends of the twenty-seventh resistor and the ground terminal are connected, the drain of the second MOSFET is connected to the non-inverting input of the first operational amplifier and one end of the first capacitor, the gate of the second MOSFET is connected to the second connector, one end of the fourth resistor is connected to the gate of the first MOSFET, the other end of the first capacitor, the source of the second MOSFET, the other end of the fourth resistor and the ground terminal are connected, the self-test signal is fed back to the gate of the first MOSFET through the first connector, the fourth resistor is used to discharge the parasitic capacitance of the gate of the first MOSFET, the response time is adjusted by setting the capacitance value of the first capacitor, and the oxygen supply start signal is fed back to the gate of the second MOSFET on the self-test circuit through the second connector.

2. The self-test circuit for the intelligent respirator according to claim 1, characterized in that, It also includes a fifth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a twentieth resistor, a seventh operational amplifier, a sixth MOSFET, a seventh MOSFET, and a second capacitor. One end of the fifth resistor is connected to the second connector and the gate of the seventh MOSFET. One end of the sixteenth resistor is connected to the power supply. The other end of the sixteenth resistor is connected to one end of the seventeenth resistor and the source of the sixth MOSFET. The gate of the sixth MOSFET is connected to the first connector. The drain of the sixth MOSFET is connected to the drain of the seventh MOSFET and one end of the second capacitor. The source of the seventh MOSFET is connected to one end of the eighteenth resistor and the inverting input of the seventh operational amplifier. The non-inverting input of the seventh operational amplifier is connected to one end of the twentieth resistor. The other ends of the fifth resistor, the seventeenth resistor, the eighteenth resistor, the twentieth resistor, and the second capacitor are connected to the ground terminal.

3. The self-test circuit for the intelligent respirator according to claim 1, characterized in that, It also includes a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a second operational amplifier, a fifth operational amplifier, and a sixth operational amplifier. The non-inverting input of the fifth operational amplifier is connected to the inverting input of the first operational amplifier. The inverting input of the fifth operational amplifier is connected to one end of the seventh resistor. The output of the fifth operational amplifier is connected to the other end of the seventh resistor and one end of the eighth resistor. The non-inverting input of the second operational amplifier is connected to one end of the tenth resistor. The inverting input of the second operational amplifier is connected to the other end of the eighth resistor and one end of the ninth resistor. The output of the second operational amplifier is connected to the other end of the ninth resistor and one end of the twelfth resistor. The inverting input of the sixth operational amplifier is connected to one end of the eleventh resistor and the other end of the twelfth resistor. The output of the sixth operational amplifier is connected to the other end of the eleventh resistor. The other end of the tenth resistor, the non-inverting input of the sixth operational amplifier, and the ground terminal are connected.

4. The self-test circuit for the intelligent respirator according to claim 3, characterized in that, It also includes a fourteenth resistor, a twenty-sixth resistor, a third operational amplifier, a fourth transistor, a fifth MOSFET, a third connector, and a second light-emitting diode. The anode of the second light-emitting diode is connected to the anode of the first light-emitting diode. The cathode of the second light-emitting diode is connected to the collector of the fourth transistor. The emitter of the fourth transistor is connected to one end of the twenty-sixth resistor. The base of the fourth transistor is connected to the output terminal of the third operational amplifier. The non-inverting input of the third operational amplifier is connected to one end of the fourteenth resistor and the drain of the fifth MOSFET. The inverting input of the third operational amplifier is connected to the output terminal of the sixth operational amplifier. The gate of the fifth MOSFET is connected to the output terminal of the seventh operational amplifier. The source of the fifth MOSFET is connected to the third connector. The other ends of the fourteenth resistor and the twenty-sixth resistor are connected to the ground terminal.

5. The self-test circuit for the intelligent respirator according to claim 4, characterized in that, It also includes a 21st resistor, a 23rd resistor, a 24th resistor, a 25th resistor, a fourth operational amplifier, an eighth MOSFET, a ninth MOSFET, a fourth connector, a sixth connection terminal, a third capacitor, and a third light-emitting diode. One end of the 21st resistor is connected to the drain of the eighth MOSFET and the fourth connector. The gate of the eighth MOSFET is connected to the gate of the ninth MOSFET, the base of the fourth transistor, and one end of the third capacitor. The source of the eighth MOSFET is connected to the drain of the ninth MOSFET, one end of the 24th resistor, and one end of the 25th resistor. The source of the ninth MOSFET is connected to the anode of the third light-emitting diode and the sixth connection terminal. The output terminal of the fourth operational amplifier is connected to the other end of the 25th resistor. The inverting input of the fourth operational amplifier is connected to the drain of the seventh MOSFET. The non-inverting input of the fourth operational amplifier is connected to one end of the 23rd resistor. The other ends of the 21st resistor, the 23rd resistor, the 24th resistor, the third capacitor, the cathode of the third light-emitting diode, and the ground terminal are connected.

6. The self-test circuit for the intelligent respirator according to claim 4, characterized in that, It also includes a nineteenth resistor, one end of which is connected to the gate of the fifth MOS transistor, and the other end of which is connected to the ground terminal.

7. The self-test circuit for the intelligent respirator according to claim 5, characterized in that, It also includes a 22nd resistor, one end of which is connected to the gate of the 8th MOS transistor, and the other end of which is connected to the ground terminal.

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