Overvoltage protection circuit for inflatable vest

Abstract

The utility model discloses an overvoltage protection circuit for an inflatable vest. The overvoltage protection circuit comprises a pressure detection circuit, a differential output circuit, a master control circuit, a biasing circuit and a comparison circuit. The real-time pressure of the inflatable vest is detected in real time through the pressure detection circuit, the differential output circuit is combined to output the first differential signal and the second differential signal to the comparison circuit, the comparison circuit is combined with the bias signal output by the master control circuit and the bias circuit, the first differential signal and the second differential signal, and the pressure of the inflatable vest is detected in real time. And a control signal is output to the air pressure source of the inflatable vest, so that the air pressure source is disconnected, and by directly disconnecting the air pressure source of the inflatable vest instead of a software control mode, the high-frequency vibration sputum excretion machine can stop inflating in time and react quickly when the air pressure exceeds the bearing range of a patient after external conditions intervene, so that the sputum excretion efficiency is improved. And the patient is effectively and timely protected.

Description

Technical Field

[0001] The utility model relates to the technical field of sputum removal machines, in particular to an overvoltage protection circuit for an inflatable vest. Background Art

[0002] High-frequency vibration expectoration machine is the main means for doctors to treat respiratory secretion blockage. In the prior art, patients need to wear an inflatable vest for treatment, and inflation is the main means of treating respiratory secretion blockage. In the prior art, when external conditions intervene and cause the air pressure to exceed the patient's tolerance range, software detection is usually used to shut down the air pressure source of the inflatable vest, resulting in the inability to stop the inflation of the inflatable vest in time, slow reaction speed, and failure to protect the patient in time. Utility Model Content

[0003] Based on this, it is necessary to propose an inflatable vest overvoltage protection circuit to address the above problems.

[0004] An overvoltage protection circuit for an inflatable vest, comprising:

[0005] A pressure detection circuit, the input end of which is in contact with the inflatable vest, and the output end of which is connected to the input end of the differential output circuit, for detecting the real-time pressure of the inflatable vest and outputting the real-time pressure to the differential output circuit;

[0006] The differential output circuit, whose output end is connected to the input end of the comparison circuit, is used to receive the real-time pressure, convert the real-time pressure into a first differential signal and a second differential signal, and output the first differential signal and the second differential signal to the comparison circuit;

[0007] A main control circuit, whose output end is connected to the input end of the bias circuit, and is used to output a bias signal to the bias circuit;

[0008] The bias circuit has an output end connected to the input end of the comparison circuit, and is used to output the amplified bias signal to the comparison circuit;

[0009] The comparison circuit has an output end connected to the air pressure source of the inflatable vest, and is used to receive the first differential signal, the second differential signal and the bias signal, and output a control signal to the air pressure source to disconnect the air pressure source.

[0010] In one embodiment, the pressure detection circuit includes: a pressure detection chip, a first operational amplifier, a first resistor and a second resistor;

[0011] The positive input terminal IN+ of the pressure detection chip is connected to the output terminal of the first operational amplifier, the negative input terminal of the pressure detection chip is connected to the inverting input terminal of the first operational amplifier, and the positive output terminal and the negative output terminal of the pressure detection chip are both connected to the input terminal of the differential output circuit;

[0012] One end of the first resistor is connected to an external power supply, and the other end is connected to a non-inverting input terminal of the first operational amplifier;

[0013] One end of the second resistor is connected to the non-inverting input terminal of the first operational amplifier, and the other end is grounded.

[0014] In one embodiment, the pressure detection circuit further includes: a first capacitor;

[0015] One end of the first capacitor is connected to the common end of the first operational amplifier and the other end is grounded.

[0016] In one embodiment, the differential output circuit includes: a second operational amplifier and a third operational amplifier;

[0017] The non-inverting input terminal of the second operational amplifier is connected to the negative output terminal of the pressure detection chip, the inverting input terminal of the second operational amplifier is connected to the inverting input terminal of the third operational amplifier, and the output terminal of the second operational amplifier is connected to the input terminal of the comparison circuit;

[0018] The non-inverting input terminal of the third operational amplifier is connected to the positive output terminal of the pressure detection chip, and the output terminal of the third operational amplifier is connected to the input terminal of the comparison circuit.

[0019] In one embodiment, the differential output circuit further includes: a third resistor, a fourth resistor and a fifth resistor;

[0020] One end of the third resistor is connected to the inverting input terminal of the second operational amplifier, and the other end is connected to the output terminal of the second operational amplifier;

[0021] One end of the fourth resistor is connected to the inverting input terminal of the third operational amplifier, and the other end is connected to the output terminal of the third operational amplifier;

[0022] One end of the fifth resistor is connected to the inverting input terminal of the second operational amplifier, and the other end is connected to the inverting input terminal of the third operational amplifier.

[0023] In one embodiment, the main control circuit includes: a main control chip;

[0024] The output end of the main control chip is connected to the input end of the bias circuit.

[0025] In one embodiment, the bias circuit includes: a fourth operational amplifier and a sixth resistor;

[0026] The non-inverting input terminal of the fourth operational amplifier is connected to the output terminal of the main control chip, and the inverting input terminal of the fourth operational amplifier is connected to the output terminal of the fourth operational amplifier.

[0027] In one embodiment, the bias circuit further includes: a seventh resistor, a ninth resistor, a second capacitor and a third capacitor;

[0028] One end of the ninth resistor is connected to the output end of the main control chip, and the other end is connected to one end of the seventh resistor, and the other end of the seventh resistor is connected to the non-inverting input end of the fourth operational amplifier;

[0029] One end of the second capacitor is connected to the non-inverting input terminal of the fourth operational amplifier, and the other end is grounded;

[0030] The third capacitor is connected in parallel with the second capacitor.

[0031] In one embodiment, the comparison circuit includes: a fifth operational amplifier and a MOS tube;

[0032] The inverting input terminal of the fifth operational amplifier is connected to the output terminal of the second operational amplifier, the non-inverting input terminal of the fifth operational amplifier is connected to the output terminal of the third operational amplifier, and the output terminal of the fifth operational amplifier is connected to the gate of the MOS tube;

[0033] The source of the MOS tube is grounded, and the drain of the MOS tube is connected to the switch.

[0034] In one embodiment, the comparison circuit further includes: a tenth resistor and an eleventh resistor;

[0035] One end of the tenth resistor is connected to the output end of the fifth operational amplifier, and the other end is connected to the gate of the MOS tube;

[0036] One end of the eleventh resistor is connected to the gate of the MOS tube, and the other end is grounded.

[0037] Implementing the embodiments of the present utility model will have the following beneficial effects:

[0038] The present application detects the real-time pressure of the inflatable vest through a pressure detection circuit, and outputs the real-time pressure to a differential output circuit; the differential output circuit receives the real-time pressure, and converts the real-time pressure into a first differential signal and a second differential signal, and outputs the first differential signal and the second differential signal to the comparison circuit; the main control circuit outputs a bias signal to the bias circuit; the bias circuit outputs the amplified bias signal to the comparison circuit; the comparison circuit receives the first differential signal, the second differential signal and the bias signal, and outputs a control signal to the air pressure source to disconnect the air pressure source. The present application detects the real-time pressure of the inflatable vest in real time through a pressure detection circuit, and outputs a first differential signal and a second differential signal to a comparison circuit in combination with a differential output circuit. The comparison circuit outputs a control signal to the air pressure source of the inflatable vest in combination with the bias signal output by the main control circuit and the bias circuit and the first differential signal and the second differential signal to disconnect the air pressure source. By directly disconnecting the air pressure source of the inflatable vest rather than by software control, the high-frequency vibration expectoration machine can stop inflation in time and respond quickly when the air pressure exceeds the patient's tolerance range after external conditions intervene, thereby effectively and timely protecting the patient. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0040] in:

[0041] Figure 1 is a structural block diagram of an overvoltage protection circuit of an inflatable vest in one embodiment;

[0042] Figure 2 is a circuit diagram of a pressure detection circuit, a differential output circuit, a comparison circuit and a bias circuit 50 in one embodiment;

[0043] Figure 3 FIG. 4 is a circuit diagram of a main control circuit in one embodiment. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0045] High-frequency vibration expectoration machine is the main means for doctors to treat respiratory secretion blockage. In the prior art, patients need to wear an inflatable vest for treatment, and inflation is the main means of treating respiratory secretion blockage. In the prior art, when external conditions intervene and cause the air pressure to exceed the patient's tolerance range, software detection is usually used to shut down the air pressure source of the inflatable vest, resulting in the inability to stop the inflatable vest from inflating in time, slow reaction speed, and failure to protect the patient in time. In order to solve the above technical problems, the present application provides an inflatable vest overvoltage protection circuit, such as Figure 1 As shown, it includes: a pressure detection circuit 10, a differential output circuit 20, a comparison circuit 30, a main control circuit 40 and a bias circuit 50; wherein the input end of the pressure detection circuit 10 is in contact with the inflatable vest, and the output end is connected to the input end of the differential output circuit 20, for detecting the real-time pressure of the inflatable vest, and outputting the real-time pressure to the differential output circuit 20; the output end of the differential output circuit 20 is connected to the input end of the comparison circuit 30, for receiving the real-time pressure, and converting the real-time pressure into a first differential signal and a second differential signal, and the first differential signal is output to the inflatable vest. The signal and the second differential signal are output to the comparison circuit 30; the output end of the main control circuit 40 is connected to the input end of the bias circuit 50, for outputting the bias signal DA to the bias circuit 50; the output end of the bias circuit 50 is connected to the input end of the comparison circuit 30, for outputting the amplified bias signal DA to the comparison circuit 30; the output end of the comparison circuit 30 is connected to the air pressure source of the inflatable vest, for receiving the first differential signal, the second differential signal and the bias signal DA, and outputting a control signal to the air pressure source to disconnect the air pressure source. The present application detects the real-time pressure of the inflatable vest through a pressure detection circuit, and outputs the real-time pressure to a differential output circuit; the differential output circuit receives the real-time pressure, and converts the real-time pressure into a first differential signal and a second differential signal, and outputs the first differential signal and the second differential signal to the comparison circuit; the main control circuit outputs a bias signal to the bias circuit; the bias circuit outputs the amplified bias signal to the comparison circuit; the comparison circuit receives the first differential signal, the second differential signal and the bias signal, and outputs a control signal to the air pressure source to disconnect the air pressure source. The present application detects the real-time pressure of the inflatable vest in real time through a pressure detection circuit, and outputs a first differential signal and a second differential signal to a comparison circuit in combination with a differential output circuit. The comparison circuit outputs a control signal to the air pressure source of the inflatable vest in combination with the bias signal output by the main control circuit and the bias circuit and the first differential signal and the second differential signal to disconnect the air pressure source. By directly disconnecting the air pressure source of the inflatable vest rather than by software control, the high-frequency vibration expectoration machine can stop inflation in time and respond quickly when the air pressure exceeds the patient's tolerance range after external conditions intervene, thereby effectively and timely protecting the patient.

[0046] In one embodiment, Figure 2 As shown, the pressure detection circuit 10 includes: a pressure detection chip U1, a first operational amplifier U2, a first resistor R1 and a second resistor R2; wherein, the positive input terminal IN+ of the pressure detection chip U1 is connected to the output terminal of the first operational amplifier U2, the negative input terminal IN- of the pressure detection chip U1 is connected to the inverting input terminal of the first operational amplifier U2, and the positive output terminal O+ and the negative output terminal O- of the pressure detection chip U1 are both connected to the input terminal of the differential output circuit 20; one end of the first resistor R1 is connected to an external power supply, and the other end is connected to the positive input terminal of the first operational amplifier U2; one end of the second resistor R2 is connected to the positive input terminal of the first operational amplifier U2, and the other end is grounded.

[0047] In one embodiment, Figure 2 As shown, the pressure detection circuit 10 further includes: a first capacitor C1; wherein one end of the first capacitor C1 is connected to the common end of the first operational amplifier U2 and the other end is grounded.

[0048] In one embodiment, Figure 2 As shown, the differential output circuit 20 includes: a second operational amplifier U3 and a third operational amplifier U4; wherein, the non-inverting input terminal of the second operational amplifier U3 is connected to the negative output terminal O- of the pressure detection chip U1, the inverting input terminal of the second operational amplifier U3 is connected to the inverting input terminal of the third operational amplifier U4, and the output terminal of the second operational amplifier U3 is connected to the input terminal of the comparison circuit 30; the non-inverting input terminal of the third operational amplifier U4 is connected to the positive output terminal O+ of the pressure detection chip U1, and the output terminal of the third operational amplifier U4 is connected to the input terminal of the comparison circuit 30.

[0049] In one embodiment, Figure 2 As shown, the differential output circuit 20 also includes: a third resistor R4, a fourth resistor R5 and a fifth resistor R6; wherein, one end of the third resistor R4 is connected to the inverting input terminal of the second operational amplifier U3, and the other end is connected to the output terminal of the second operational amplifier U3; one end of the fourth resistor R5 is connected to the inverting input terminal of the third operational amplifier U4, and the other end is connected to the output terminal of the third operational amplifier U4; one end of the fifth resistor R6 is connected to the inverting input terminal of the second operational amplifier U3, and the other end is connected to the inverting input terminal of the third operational amplifier U4.

[0050] In one embodiment, Figure 3 As shown, the main control circuit 40 includes: a main control chip U7; wherein the output terminal PA4 of the main control chip U7 is connected to the input terminal of the bias circuit 50.

[0051] In one embodiment, Figure 2As shown, the bias circuit 50 includes: a fourth operational amplifier U5 and a sixth resistor R6; wherein, the non-inverting input terminal of the fourth operational amplifier U5 is connected to the output terminal PA4 of the main control chip U7, and the inverting input terminal of the fourth operational amplifier U5 is connected to the output terminal of the fourth operational amplifier U5.

[0052] In one embodiment, Figure 2 As shown, the bias circuit 50 also includes: a seventh resistor R8, a ninth resistor R9, a second capacitor C2 and a third capacitor C3; wherein one end of the ninth resistor R9 is connected to the output terminal PA4 of the main control chip U7, and the other end is connected to one end of the seventh resistor R8, and the other end of the seventh resistor R8 is connected to the in-phase input terminal of the fourth operational amplifier U5; one end of the second capacitor C2 is connected to the in-phase input terminal of the fourth operational amplifier U5, and the other end is grounded; the third capacitor C3 is connected in parallel with the second capacitor C2.

[0053] In one embodiment, Figure 2 As shown, the comparison circuit 30 includes: a fifth operational amplifier U6 and a MOS tube Q1; wherein, the inverting input terminal of the fifth operational amplifier U6 is connected to the output terminal of the second operational amplifier U3, the non-inverting input terminal of the fifth operational amplifier U6 is connected to the output terminal of the third operational amplifier U4, and the output terminal of the fifth operational amplifier U6 is connected to the gate of the MOS tube Q1; the source of the MOS tube Q1 is grounded, and the drain of the MOS tube Q1 is connected to the open circuit.

[0054] In one embodiment, Figure 2 As shown, the comparison circuit 30 also includes: a tenth resistor R10 and an eleventh resistor R11; wherein one end of the tenth resistor R10 is connected to the output end of the fifth operational amplifier U6, and the other end is connected to the gate of the MOS tube Q1; one end of the eleventh resistor R11 is connected to the gate of the MOS tube Q1, and the other end is grounded.

[0055] The present application detects the real-time pressure of the inflatable vest through a pressure detection circuit, and outputs the real-time pressure to a differential output circuit; the differential output circuit receives the real-time pressure, and converts the real-time pressure into a first differential signal and a second differential signal, and outputs the first differential signal and the second differential signal to the comparison circuit; the main control circuit outputs a bias signal to the bias circuit; the bias circuit outputs the amplified bias signal to the comparison circuit; the comparison circuit receives the first differential signal, the second differential signal and the bias signal, and outputs a control signal to the air pressure source to disconnect the air pressure source. The present application detects the real-time pressure of the inflatable vest in real time through a pressure detection circuit, and outputs a first differential signal and a second differential signal to a comparison circuit in combination with a differential output circuit. The comparison circuit outputs a control signal to the air pressure source of the inflatable vest in combination with the bias signal output by the main control circuit and the bias circuit and the first differential signal and the second differential signal to disconnect the air pressure source. By directly disconnecting the air pressure source of the inflatable vest rather than by software control, the high-frequency vibration expectoration machine can stop inflation in time and respond quickly when the air pressure exceeds the patient's tolerance range after external conditions intervene, thereby effectively and timely protecting the patient.

[0056] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. An inflatable vest overvoltage protection circuit, It is characterized in that include: A pressure detection circuit, the input end of which is in contact with the inflatable vest, and the output end of which is connected to the input end of the differential output circuit, for detecting the real-time pressure of the inflatable vest and outputting the real-time pressure to the differential output circuit; The differential output circuit, whose output end is connected to the input end of the comparison circuit, is used to receive the real-time pressure, convert the real-time pressure into a first differential signal and a second differential signal, and output the first differential signal and the second differential signal to the comparison circuit; A main control circuit, whose output end is connected to the input end of the bias circuit, and is used to output a bias signal to the bias circuit; The bias circuit has an output end connected to the input end of the comparison circuit, and is used to output the amplified bias signal to the comparison circuit; The comparison circuit has an output end connected to the air pressure source of the inflatable vest, and is used to receive the first differential signal, the second differential signal and the bias signal, and output a control signal to the air pressure source to disconnect the air pressure source.

2. The inflatable vest overvoltage protection circuit according to claim 1, It is characterized in that The pressure detection circuit comprises: a pressure detection chip, a first operational amplifier, a first resistor and a second resistor; The positive input terminal IN+ of the pressure detection chip is connected to the output terminal of the first operational amplifier, the negative input terminal of the pressure detection chip is connected to the inverting input terminal of the first operational amplifier, and the positive output terminal and the negative output terminal of the pressure detection chip are both connected to the input terminal of the differential output circuit; One end of the first resistor is connected to an external power supply, and the other end is connected to a non-inverting input terminal of the first operational amplifier; One end of the second resistor is connected to the non-inverting input terminal of the first operational amplifier, and the other end is grounded.

3. The inflatable vest overvoltage protection circuit according to claim 2, It is characterized in that The pressure detection circuit further includes: a first capacitor; One end of the first capacitor is connected to the common end of the first operational amplifier and the other end is grounded.

4. The inflatable vest overvoltage protection circuit according to claim 3, It is characterized in that The differential output circuit comprises: a second operational amplifier and a third operational amplifier; The non-inverting input terminal of the second operational amplifier is connected to the negative output terminal of the pressure detection chip, the inverting input terminal of the second operational amplifier is connected to the inverting input terminal of the third operational amplifier, and the output terminal of the second operational amplifier is connected to the input terminal of the comparison circuit; The non-inverting input terminal of the third operational amplifier is connected to the positive output terminal of the pressure detection chip, and the output terminal of the third operational amplifier is connected to the input terminal of the comparison circuit.

5. The inflatable vest overvoltage protection circuit according to claim 4, It is characterized in that The differential output circuit further includes: a third resistor, a fourth resistor and a fifth resistor; One end of the third resistor is connected to the inverting input terminal of the second operational amplifier, and the other end is connected to the output terminal of the second operational amplifier; One end of the fourth resistor is connected to the inverting input terminal of the third operational amplifier, and the other end is connected to the output terminal of the third operational amplifier; One end of the fifth resistor is connected to the inverting input terminal of the second operational amplifier, and the other end of the fifth resistor is connected to the inverting input terminal of the third operational amplifier.

6. The inflatable vest overvoltage protection circuit according to claim 1, It is characterized in that The main control circuit comprises: a main control chip; The output end of the main control chip is connected to the input end of the bias circuit.

7. The inflatable vest overvoltage protection circuit according to claim 6, It is characterized in that The bias circuit comprises: a fourth operational amplifier and a sixth resistor; The non-inverting input terminal of the fourth operational amplifier is connected to the output terminal of the main control chip, and the inverting input terminal of the fourth operational amplifier is connected to the output terminal of the fourth operational amplifier.

8. The overvoltage protection circuit of the inflatable vest according to claim 7, It is characterized in that The bias circuit further includes: a seventh resistor, a ninth resistor, a second capacitor and a third capacitor; One end of the ninth resistor is connected to the output end of the main control chip, and the other end is connected to one end of the seventh resistor, and the other end of the seventh resistor is connected to the non-inverting input end of the fourth operational amplifier; One end of the second capacitor is connected to the non-inverting input terminal of the fourth operational amplifier, and the other end is grounded; The third capacitor is connected in parallel with the second capacitor.

9. The inflatable vest overvoltage protection circuit according to claim 4, It is characterized in that The comparison circuit comprises: a fifth operational amplifier and a MOS tube; The inverting input terminal of the fifth operational amplifier is connected to the output terminal of the second operational amplifier, the non-inverting input terminal of the fifth operational amplifier is connected to the output terminal of the third operational amplifier, and the output terminal of the fifth operational amplifier is connected to the gate of the MOS tube; The source of the MOS tube is grounded, and the drain of the MOS tube is connected to the open hook.

10. The inflatable vest overvoltage protection circuit according to claim 9, It is characterized in that The comparison circuit further includes: a tenth resistor and an eleventh resistor; One end of the tenth resistor is connected to the output end of the fifth operational amplifier, and the other end is connected to the gate of the MOS tube; One end of the eleventh resistor is connected to the gate of the MOS tube, and the other end is grounded.

Images