Gas detection and alarm control circuit and medical device

Abstract

The utility model relates to medical device technical field, especially a kind of gas detection and alarm control circuit and medical device;Gas state detection module in gas detection and alarm control circuit includes series connection's gas state detection device, gas state warning control circuit and warning output device, gas state warning control circuit includes control module U2, control module U2 is voice IC, control module U2 includes IO1 pin and OKY1 pin, IO1 pin and OKY1 pin are respectively as input pin and high-level warning circuit and low-level warning circuit in gas state warning control circuit connection, gas state detection device detects gas state and generates state signal, control module U2 obtains state signal by high-level warning circuit or low-level warning circuit, based on state signal control gas state warning output device and output gas state warning information, using voice IC, the richness of alarm sound is improved, patient will not feel bored, satisfy more alarm function demand.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical device technical field, especially a kind of gas detection and alarm control circuit and medical device. BACKGROUND

[0002] Gas plays an indispensable important role in vivo and outside, and medical gas is widely used in medical field as gas for medical diagnosis and life rescue. When animals need to be operated for health reasons, they need to be provided with breathing support and anesthesia by external anesthesia machine.

[0003] When the pressure supply of medical gas does not meet the requirements, medical staff needs to be notified in the first time to make adjustment. When the traditional anesthesia machine sends warning information by sound, the sound is monotonous and irritating, and the patient is easy to feel bored. The content of warning information is monotonous and poor, which cannot meet more functional requirements. UTILITY MODEL

[0004] To solve the problem that the traditional anesthesia machine sends warning information by sound, the sound is monotonous and irritating, the patient is easy to feel bored, and the content of warning information is monotonous and poor, which cannot meet more functional requirements, the utility model provides a kind of gas detection and alarm control circuit and medical device.

[0005] The utility model solves technical problem's scheme to provide a kind of gas detection and alarm control circuit, the gas detection and alarm control circuit includes electrically connected power module and gas state detection module, the gas state detection module includes series connection's gas state detection device, gas state warning control circuit and gas state warning output device, the power module includes power switch, the gas state warning control circuit includes control module U2, the control module U2 is voice IC, the control module U2 includes IO1 pin, the gas state warning control circuit includes senior warning circuit, the senior warning circuit includes resistance R9, resistance R10 and electric capacity C15, the IO1 pin is connected the power switch by the resistance R9;The IO1 pin is connected the gas state detection device by the resistance R10, the IO1 pin is grounded by the electric capacity C15, the gas state detection device detects gas state and generates state signal, the IO1 pin obtains the state signal by the senior warning circuit, and gas state warning output device is controlled based on the state signal and exports gas state warning information.

[0006] Preferably, the control module U2 further comprises an OKY1 pin, and the gas state warning control circuit further comprises a low-level warning circuit, the low-level warning circuit comprising a resistor R6, a resistor R7, a resistor R8 and a capacitor C12, the OKY1 pin being connected to the power switch through the resistor R6; the OKY1 pin being grounded through the resistor R7, the OKY1 pin being connected to the gas state detection device through the resistor R8, the OKY1 pin being grounded through the capacitor C12, the OKY1 pin acquiring the state signal through the low-level warning circuit and controlling the gas state warning output device to output gas state warning information based on the state signal.

[0007] Preferably, the gas state detection device detecting the gas state comprises pressure detection and / or flow detection and / or concentration detection of the gas.

[0008] Preferably, the control module U2 comprises a VDD pin, a GND pin and at least one group of PWM pins, the VDD pin being connected to the power switch, one end of the gas state detection device being connected to the power switch through a resistor R10 and a resistor R9 in sequence, the other end of the gas state detection device being grounded, the IO1 pin being connected between the resistor R9 and the resistor R10, and the PWM pin being connected to the gas state warning output device.

[0009] Preferably, the gas state warning control circuit further comprises a magnetic bead, the PWM pin being connected to the input end of the gas state warning output device through the magnetic bead, and / or the gas state warning control circuit further comprises a capacitor C11, the input end of the gas state warning output device being grounded through the capacitor C11.

[0010] Preferably, the power module adopts direct current power supply and / or battery power supply, and further comprises a charge and discharge circuit, a lithium battery and a charging state display device connected in an electrical manner.

[0011] Preferably, the power module is externally connected with an external DC power supply, the charging and discharging circuit comprises a battery charger control IC, a PNP transistor Q1 and a charging state display device, the battery charger control IC comprises a BAT pin and a CHRG pin; the positive electrode of the lithium battery is connected with the BAT pin, the negative electrode of the lithium battery is grounded, the power switch is connected with the BAT pin of the battery charger control IC, the CHRG pin is connected with the base of the PNP transistor Q1 through a resistor R2, the emitter of the PNP transistor Q1 is connected with the positive electrode of the external DC power supply, the base and the collector of the PNP transistor Q1 are grounded through a capacitor C16 and a capacitor C17 respectively, the negative electrode of the charging state display device is grounded, and the positive electrode of the charging state display device is connected with the collector of the PNP transistor Q1 through a resistor R11.

[0012] Preferably, the battery charger control IC further comprises an IN pin, a GND pin, an EN pin, an SW pin, an SEN pin, a TEMP pin and a BS pin, the IN pin is grounded through a capacitor C5, the GND pin is grounded, the EN pin is grounded through a capacitor C1, the SW pin is connected with the BAT pin in sequence through an inductor L1 and a resistor R4, the SEN pin is connected between the inductor L1 and the resistor R4, the TEMP pin is grounded through a resistor R1, a bootstrap capacitor C4 is connected between the BS pin and the SW pin, and the SW pin is grounded in sequence through a resistor R5 and a capacitor C9; the positive electrode of the lithium battery is grounded through parallel-connected capacitors C6, C7 and C8, and the positive electrode of the external DC power supply is grounded through parallel-connected capacitors C2 and C3.

[0013] Preferably, the gas detection and alarm control circuit further comprises a power supply battery voltage detection module, the power supply battery voltage detection module comprises a voltage detection circuit and an undervoltage state display device, the voltage detection circuit comprises a battery voltage monitoring IC, a NPN transistor Q2 and a NPN transistor Q3, the battery voltage monitoring IC comprises a VDD pin, a RESET pin and a GND pin; the VDD pin is connected with the power switch, the base of the NPN transistor Q3 is connected with the RESET pin through a resistor R15, the RESET pin is grounded through a resistor R16, the emitter of the NPN transistor Q3 is grounded, the base of the NPN transistor Q2 is connected with the power switch in sequence through a resistor R13 and a resistor R14, the base of the NPN transistor Q3 is connected between the resistor R14 and the resistor R13, the emitter of the NPN transistor Q2 is grounded, and the collector of the NPN transistor Q2 is connected with the power switch through a resistor R12; the positive electrode of the undervoltage state display device is connected with the collector of the NPN transistor Q2, and the negative electrode of the undervoltage state display device is grounded.

[0014] The utility model discloses in another embodiment to solve the above technical problem provides a kind of medical device, and the circuit of the medical device is the gas detection and alarm control circuit described above.

[0015] Compared with the prior art, the gas detection and alarm control circuit and the medical device have the following advantages:

[0016] 1、The utility model discloses a gas detection and alarm control circuit includes power module and gas state detection module, and gas state detection module includes series connection's gas state detection device, gas state warning control circuit and gas state warning output device, and power module includes power switch, and gas state warning control circuit includes control module U2, and control module U2 is voice IC, and control module U2 includes IO1 pin, and gas state warning control circuit includes senior warning circuit, and senior warning circuit includes resistance R9, resistance R10 and condenser C15, and IO1 pin connects power switch through resistance R9;IO1 pin connects gas state detection device through resistance R10, and IO1 pin is grounded through condenser C15, and gas state detection device detects gas state and generates state signal, and IO1 pin obtains state signal through senior warning circuit, and gas state warning output device exports gas state warning information based on state signal.Due to control module U2 is voice IC, by setting gas state detection device detects gas state and generates state signal, and by senior warning circuit, IO1 pin of control module U2 receives the state signal, and then based on state signal control gas state warning output device exports gas state warning information, IO1 pin receives state signal as input pin, and control module U2 controls gas state warning output device to export voice warning information, can realize the accurate control and real-time monitoring of voice broadcast, and can improve the richness of alarm sound, satisfy more alarm function demand, will not make patient feel bored, can satisfy medical alarm sound etc. authentication.

[0017] 2, The control module U2 of the utility model further comprises an OKY1 pin, the gas state warning control circuit further comprises a low-level warning circuit, the low-level warning circuit comprises a resistor R6, a resistor R7, a resistor R8 and a capacitor C12, the OKY1 pin is connected with the power switch through the resistor R6; the OKY1 pin is grounded through the resistor R7, the OKY1 pin is connected with the gas state detection device through the resistor R8, the OKY1 pin is grounded through the capacitor C12, the OKY1 pin obtains the state signal through the low-level warning circuit, and the gas state warning output device is controlled to output the gas state warning information based on the state signal. Since the OKY1 pin is connected with the gas state detection device through the resistor R8, the OKY1 pin can use the state signal of the gas state detection device as the input of the trigger signal, optionally, a PWM pin is arranged on the control module U2, and the control module U2 controls the gas state warning output device to output the gas state warning information through the PWM pin after being triggered. The OKY1 pin is used as the input pin, the voice IC can also improve the richness of the alarm sound, meet more alarm function requirements, and avoid the patient's boredom with the alarm sound.

[0018] 3, The gas state detection device of the utility model detects the gas state and comprises pressure detection, flow detection and concentration detection. By using one or more of the pressure detection, flow detection and concentration detection, the gas pressure state can be effectively detected, the pressure detection can directly detect whether the supplied gas pressure meets the requirements, and the flow detection and concentration detection can indirectly detect the pressure although they do not directly detect the pressure.

[0019] 4, The utility model discloses a control module U2 includes VDD pin, GND pin and at least one group PWM pin, VDD pin connects the power switch, and the one end of gas state detection device passes through resistance R10 and resistance R9 in proper order and is connected with the power switch, and the other end of gas state detection device is grounded, and IO1 pin is connected between resistance R9 and resistance R10, and PWM pin is connected with gas state warning output device. Since the one end of gas state detection device passes through resistance R10 and resistance R9 in proper order and is connected with the power switch, and IO1 pin is connected between resistance R9 and resistance R10, when the state signal of gas state detection device triggers IO1 pin, control module U2 exports control signal through PWM pin and controls the output of gas state warning device, and through the duty ratio of PWM pin, the accurate control to gas state warning output device can be realized. And the PWM signal of PWM pin output can also realize energy saving and improve efficiency, and unnecessary power consumption can be reduced by adjusting the duty ratio. When the PWM pin is set as multiple groups, the control signal output has more functions and flexibility, and can realize more accurate control. The above setting makes that gas state warning control circuit does not use MCU and only relies on circuit, and since does not use MCU, can effectively reduce cost, and through the duty ratio of PWM signal output by PWM pin, unnecessary power consumption can be reduced, and the design without MCU, thereby realizing the low power consumption of gas state warning control circuit, and therefore the above setting makes that gas detection and alarm control circuit has the advantages of low cost and low power consumption.

[0020] 5, The utility model discloses a gas state warning control circuit still includes magnetic bead, and PWM pin is connected to the input of gas state warning output device through magnetic bead and / or gas state warning control circuit still includes capacitor C11, and the input of gas state warning output device is grounded through capacitor C11. EMI (Electromagnetic Interference) refers to the interference that the electromagnetic wave produced by electronic equipment causes to the normal work of other equipment. As output equipment, gas state warning output device can produce or be affected by EMI, and magnetic bead is a passive element and has high resistivity and small inductance value, and PWM pin is connected to the input of gas state warning output device through magnetic bead, can suppress high-frequency noise, reduces the conduction EMI. And through setting capacitor C11, the input of gas state warning output device is grounded through capacitor C11, so that high-frequency noise can flow to the ground wire through capacitor C11, thereby reducing the propagation in the circuit. Through the above method, the EMI problem can be effectively solved, and high-quality warning output information is provided.

[0021] 6. The power module of the utility model adopts DC power supply and / or battery power supply, and the power module further comprises a charge-discharge circuit, a lithium battery and a charging state display device connected electrically. By setting the power module to adopt DC power supply or battery power supply, the DC power supply can be used in a working environment with power supply conditions, and the battery power supply can be used in a working environment without power supply conditions according to different specific use scenarios. The charge-discharge circuit, the lithium battery and the charging state display device are connected electrically, and the charging state display device can display the charging state information of the lithium battery.

[0022] 7. The power module of the utility model is externally connected with an external DC power supply, the charge-discharge circuit comprises a battery charger control IC, a PNP triode Q1 and a charging state display device, the battery charger control IC comprises a BAT pin, a SEN pin, a SW pin, a BS pin, a CHRG pin and a GND pin; the positive pole of the lithium battery is connected with the BAT pin, the negative pole of the lithium battery is grounded, the power switch is connected with the BAT pin of the battery charger control IC, the CHRG pin is connected with the base of the PNP triode Q1 through a resistor R2, the emitter of the PNP triode Q1 is connected with the positive pole of the external DC power supply, the base and the collector of the PNP triode Q1 are grounded through a capacitor C16 and a capacitor C17 respectively, the negative pole of the charging state display device is grounded, and the positive pole of the charging state display device is connected with the collector of the PNP triode Q1 through a resistor R11. When the external DC power supply is connected, the CHRG pin of the battery charger control IC sends a low-level signal, the charging state display device works and displays through the PNP triode, and the charging state display device becomes a high resistance state when the external DC power supply is removed or the charging is saturated, so that the charging state display device does not work, and the real-time display of the power working state is realized.

[0023] 8, The battery charger control IC further comprises an IN pin, a GND pin, an EN pin, an SW pin, an SEN pin, a TEMP pin and a BS pin, the IN pin is grounded through a capacitor C5, the GND pin is grounded, the EN pin is grounded through a capacitor C1, the SW pin is connected with the BAT pin in sequence through an inductor L1 and a resistor R4, the SEN pin is connected between the inductor L1 and the resistor R4, the TEMP pin is grounded through a resistor R1, a bootstrap capacitor C4 is connected between the BS pin and the SW pin, and the SW pin is grounded in sequence through a resistor R5 and a capacitor C9; the positive pole of the lithium battery is grounded through the parallel connection of capacitors C6, C7 and C8, and the positive pole of the external DC power supply is grounded through the parallel connection of capacitors C2 and C3. The bootstrap capacitor C4 connected between the BS pin and the SW pin can provide sufficient driving voltage; the SW pin is grounded in sequence through the resistor R5 and the capacitor C9, which can effectively eliminate noise. By setting the SW pin connected with the BAT pin in sequence through the inductor L1 and the resistor R4, and the SEN pin connected between the inductor L1 and the resistor R4, the resistor R4 is arranged as an external sensing resistor on the SEN pin and the BAT pin, so that current detection and control during the charging process can be realized. Since a voltage drop is generated when current passes through the resistor R4, the voltage drop is proportional to the current passing through the resistor R4. The SEN pin is connected to one end of the resistor R4 and is used to read the voltage drop between the two ends of the resistor R4, and the battery charger control IC calculates the actual charging current according to the voltage drop. The BAT pin is connected with the positive pole of the lithium battery and is used to monitor the voltage of the lithium battery. The above setting helps the battery charger control IC to obtain the state information of the battery, and according to whether the battery is fully charged and whether the charging strategy needs to be adjusted, the battery charger control IC can calculate the actual charging current through an internal algorithm according to the voltage drop read on the SEN pin. If a specific charging current needs to be set, it can be realized by adjusting the value of the sensing resistor. Moreover, the battery charger control IC can adjust the charging current through an internal control algorithm according to the current sensing signal on the SEN pin and the voltage monitoring signal on the BAT pin, so as to ensure the safety and efficiency of the charging process.

[0024] 9、The gas detection and alarm control circuit of the utility model further includes a power supply battery voltage detection module, the power supply battery voltage detection module includes a voltage detection circuit and an under-voltage state display device, the voltage detection circuit includes a battery voltage monitoring IC, an NPN triode Q2, an NPN triode Q3 and the under-voltage state display device, the battery voltage monitoring IC includes a VDD pin, a RESET pin and a GND pin;The VDD pin is connected with a power switch, the base of the NPN triode Q3 is connected with the RESET pin through a resistance R15, the RESET pin is grounded through a resistance R16, the emitter of the NPN triode Q3 is grounded, the base of the NPN triode Q2 is connected with the power switch in turn through a resistance R14 and a resistance R13, the base of the NPN triode Q3 is connected between the resistance R14 and the resistance R13, the emitter of the NPN triode Q2 is grounded, the collector of the NPN triode Q2 is connected with the power switch through a resistance R12, the anode of the under-voltage state display device is connected with the collector of the NPN triode Q2, and the cathode of the under-voltage state display device is grounded.For the diversification of specific use scenarios, direct current power supply is used in the working environment with power supply conditions, and battery power supply can only be used in the working environment without power supply conditions.When battery power supply is used, in order to ensure that the voltage of the power supply battery can be maintained in a continuously stable range and avoid affecting the normal work of the gas detection and alarm control circuit, the voltage state of the power supply battery needs to be obtained.The power supply battery voltage detection module detects the voltage by being arranged, the power supply battery voltage detection module adopts the battery voltage monitoring IC, after the power switch is turned on, the battery voltage monitoring IC detects that the battery voltage is in the set voltage range, the RESET pin of the battery voltage monitoring IC sends a high-level signal as a reset pin, and the under-voltage state display device works and displays through the NPN triode.When the battery voltage monitoring IC detects that the battery voltage is not in the set voltage range, the RESET pin sends a low-level signal, and the under-voltage state display device does not work.According to the display working state of the under-voltage state display device, whether the power supply battery is under-voltage can be known, so that the real-time monitoring of the voltage of the power supply battery is realized, and the normal work of the gas detection and alarm control circuit is ensured.

[0025] 10、The utility model further provides a medical device has same beneficial effect with above-mentioned gas detection and alarm control circuit, and does not make superfluous here.

DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating creative labor.

[0027] Figure 1 is a circuit block diagram of the gas detection and alarm control circuit provided by the first embodiment of the utility model.

[0028] Figure 2 is a circuit principle diagram of the gas state detection module of the gas detection and alarm control circuit provided by the first embodiment of the utility model.

[0029] Figure 3 is a circuit principle diagram of the power module of the gas detection and alarm control circuit provided by the first embodiment of the utility model.

[0030] Figure 4 is a circuit principle diagram of the power supply battery voltage detection module of the gas detection and alarm control circuit provided by the first embodiment of the utility model.

[0031] Figure 5 is a block diagram of the medical device provided by the second embodiment of the utility model.

[0032] The figure mark explanation is as follows:

[0033] 1, gas detection and alarm control circuit;20, gas state detection module;30, power module;40, power supply battery voltage detection module;100, medical device.

CONCRETE IMPLEMENTATION

[0034] In order to make the purpose, technical scheme and advantages of the utility model more clear and obvious, the utility model is further described in detail below by combining with the drawings and implementation examples. It should be understood that the specific embodiments described herein are only used to explain the utility model, and are not used to limit the utility model.

[0035] It should be noted that when an element is referred to as "fixed to" another element, it can be directly on the other element or there can be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there can be a middle element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0036] In the utility model, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "transverse", "longitudinal" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the utility model and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0037] And, in addition to the above-mentioned partial terms can be used to indicate the orientation or position relationship, it can also be used to represent other meanings, for example, the term "upper" in some cases can also be used to represent a certain dependent relationship or connection relationship. For those skilled in the art, the specific meaning of these terms in the utility model can be understood according to the specific circumstances.

[0038] In addition, the terms "installation", "setting", "provided with", "connection", "connected" should be broadly understood. For example, it can be fixedly connected, detachably connected, or integrally configured; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or internal communication between two devices, elements or components. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0039] Please combine Figure 1 And Figure 2 The first embodiment of the utility model provides a kind of gas detection and alarm control circuit 1, and gas detection and alarm control circuit 1 includes power module 30 and gas state detection module 20 of electrically connected, gas state detection module 20 includes series connection gas state detection device, gas state warning control circuit and gas state warning output device, power module includes power switch, gas state warning control circuit includes control module U2, control module U2 is voice IC, control module U2 includes IO1 pin, gas state warning control circuit includes advanced warning circuit, advanced warning circuit includes resistance R9, resistance R10 and capacitor C15, IO1 pin is connected power switch by resistance R9;IO1 pin is connected gas state detection device by resistance R10, IO1 pin is grounded by capacitor C15, gas state detection device detects gas state and generates state signal, IO1 pin obtains state signal by advanced warning circuit, and gas state warning output device is controlled based on state signal to output gas state warning information.

[0040] It can be understood that, since control module U2 is voice IC, by setting gas state detection device detects gas state and generates state signal, and by advanced warning circuit, IO1 pin of control module U2 receives the state signal, and then based on state signal control gas state warning output device to output gas state warning information, IO1 pin receives state signal as input pin, control module U2 controls gas state warning output device to output voice warning information, accurate control and real-time monitoring of voice playing can be realized, and alarm sound richness can be improved, more alarm sound types can also meet more alarm function requirements, without making patients feel bored, to meet medical alarm sound certification, etc.

[0041] It needs to be explained that in medical electrical equipment, the audible alarm signal has strict specifications, the sound emitted by the traditional buzzer is harsh and monotonous, which can make the patient feel bored, the scheme of the utility model can adjust the parameters of the emergency degree of the sound pulse group according to the user's demand, for example, the interval between each pulse, the number of pulse group repetition, the rhythm of the pulse in the pulse group, the change of the pulse duration in a single pulse group, the tone curve and the music structure, and the frequency range can also be modified, which can realize the requirement that the alarm signal can be heard by bypassing or passing through the obstacle, and can also be distinguished from the sound of other alarm devices. At the same time, the voice IC can be built-in D class power amplifier, and the sound with large volume and comfortable sense can be emitted through the loudspeaker.

[0042] It needs to be explained that since the control module U2 is a voice IC, the gas state detection device detects the gas state and generates a state signal, and the IO1 pin of the control module U2 receives the state signal through the advanced warning circuit, and then controls the gas state warning output device to output the gas state warning information based on the state signal, which has the advantages of simple structure and low cost, compared with traditional sensors such as digital sensors, analog sensors, etc., which need software code to coordinate the communication sampling of the sensor and the MCU, and cannot meet the requirements of simplicity and low cost. The scheme of the utility model can realize the design without MCU, and the structure is simple and the cost is reduced.

[0043] Optionally, the control module U2 is a voice synthesis IC, the warning voice data is placed in the EPROM in the voice synthesis IC, and the warning voice data is played through the PWM waveform when triggered, the warning voice data can be adjusted and selected according to the demand, and the individualization demand of the warning information is met.

[0044] Optionally, the gas state detection device can adopt a pressure switch, when the detected gas pressure is greater than a certain limit, Figure 2 the connection ends 1, 2 and 3, 4 of the gas state detection device are disconnected; when the detected gas pressure is less than a certain limit, the connection ends 1, 2 and 3, 4 of the gas state detection device are connected, and the state signal is triggered.

[0045] Please continue to combine Figure 1 and Figure 2 , further, the control module U2 further includes an OKY1 pin, the gas state warning control circuit further includes a low-level warning circuit, the low-level warning circuit includes resistors R6, R7, R8 and a capacitor C12, the OKY1 pin is connected with the power switch through the resistor R6; the OKY1 pin is grounded through the resistor R7, the OKY1 pin is connected with the gas state detection device through the resistor R8, the OKY1 pin is grounded through the capacitor C12, and the OKY1 pin acquires the state signal through the low-level warning circuit, and controls the gas state warning output device to output the gas state warning information based on the state signal.

[0046] It can be understood that, since the OKY1 pin is connected to the gas state detection device through the resistor R8, the OKY1 pin can use the state signal of the gas state detection device as the input of the trigger signal. Optionally, the control module U2 is provided with a PWM pin, and after being triggered, the control module U2 controls the gas state warning output device to output the gas state warning information through the PWM pin. As the input pin, the OKY1 pin can use the voice IC to improve the richness of the alarm sound, meet more alarm function requirements, and avoid the patient's boredom of the alarm sound.

[0047] Optionally, when the IO1 pin is used, the resistor R7 is in the circuit and the resistor R8 is in the circuit; when the OKY1 pin is used, the IO1 pin is grounded, the resistor R7 is in the circuit and the resistor R8 is in the circuit. The resistor R6 and the resistor R8 form a loop with the gas detection device, and the OKY1 pin can receive the trigger signal of the gas monitoring module in the loop.

[0048] Please continue to combine Figure 1 and Figure 2 , further, the gas state detection device detects the gas state, which includes pressure detection, flow detection and / or concentration detection.

[0049] It can be understood that, by using one or more of the pressure detection, flow detection and concentration detection methods, the gas pressure state can be effectively detected. The pressure detection can directly detect whether the supplied gas pressure meets the requirements. Although the flow detection and concentration detection do not directly detect the pressure, they can detect information related to the pressure, and can indirectly detect the pressure.

[0050] Specifically, the pressure detection can use a pressure switch, a pressure sensor or a pressure gauge to detect the gas pressure by detecting absolute pressure, gauge pressure or pressure difference, and trigger the gas detection and alarm control circuit 1 to issue a warning in the case of unqualified pressure. The flow detection can use a flow meter to detect the flow, and trigger the gas detection and alarm control circuit 1 to issue a warning when the gas flow does not meet the set range. The concentration detection can use a concentration sensor to detect the flow, and trigger the gas detection and alarm control circuit 1 to issue a warning information when the gas concentration does not meet the set range.

[0051] Please continue to combine Figure 1 and Figure 2 , further, the control module U2 includes a VDD pin, a GND pin and at least one group of PWM pins, the VDD pin is connected to the power switch, one end of the gas state detection device is connected to the power switch through the resistor R10 and the resistor R9 in sequence, the other end of the gas state detection device is grounded, the IO1 pin is connected between the resistor R9 and the resistor R10, and the PWM pin is connected to the gas state warning output device.

[0052] Understandably, since the gas state detection device is connected with the power switch through the resistor R10 and the resistor R9 in turn, the power switch is powered through the power supply switch power supply pin VBAT, the IO1 pin is connected between the resistor R9 and the resistor R10, when the state signal of the gas state detection device triggers the IO1 pin, the control module U2 outputs the control signal through the PWM pin to control the output of the gas state warning device, and by adjusting the duty cycle of the PWM pin, the precise control of the gas state warning output device can be realized. And the PWM signal output by the PWM pin can also realize energy saving and improve efficiency, and unnecessary power consumption can be reduced by adjusting the duty cycle. When the PWM pin is set to multiple groups, the output control signal has more functions and flexibility, and more precise control can be realized. The above setting makes the gas state warning control circuit not use MCU and only rely on the circuit, which can effectively reduce the cost, and by adjusting the duty cycle of the PWM signal output by the PWM pin, unnecessary power consumption can be reduced, and the MCU design is not used, so that the low power consumption of the gas state warning control circuit is realized, therefore the above setting makes the gas detection and alarm control circuit 1 have the advantages of low cost and low power consumption.

[0053] It should be noted that, since the life value of animals is not as precious as the life value of human beings, the existing mechanical animal anesthetic machine for animals has lower cost than the human anesthetic machine but does not have medical gas pressure detection capability, the above setting of the gas state monitoring and warning of the utility model is realized without MCU and only relies on the circuit, has the advantage of low cost, and realizes medical gas detection and warning at low cost; and by adjusting the duty cycle of the PWM signal output by the PWM pin and the MCU design, the power consumption can be reduced, and the advantage of low power consumption is obtained, and therefore the gas detection and alarm control circuit 1 of the utility model has the advantages of low cost and low power consumption.

[0054] Please continue to combine Figure 1 and Figure 2 , further, the gas state warning control circuit further comprises a magnetic bead, the PWM pin is connected to the input end of the gas state warning output device through the magnetic bead, and / or the gas state warning control circuit further comprises a capacitor C11, and the input end of the gas state warning output device is grounded through the capacitor C11.

[0055] It can be understood that EMI (Electromagnetic Interference) refers to the interference caused by the electromagnetic waves generated by electronic devices to the normal work of other devices. As an output device, the gas state warning output device will generate or be affected by EMI. The magnetic bead is a passive element with high resistivity and small inductance value. The PWM pin is connected to the input end of the gas state warning output device through the magnetic bead, which can suppress high-frequency noise and reduce conducted EMI. By setting the capacitor C11, the input end of the gas state warning output device is connected to the ground through the capacitor C11, so that the high-frequency noise can flow to the ground through the capacitor C11, thereby reducing the propagation in the circuit. The above method can effectively solve the EMI problem and provide high-quality warning output information.

[0056] Specifically, as a preferred embodiment, the PWM pin is provided in two groups, including the PWM1 pin and the PWM2 pin, the magnetic bead includes the magnetic bead FB1 and the magnetic bead FB2, the PWM1 pin is connected to the gas state warning output device through the magnetic bead FB2; the PWM2 pin is connected to the gas state warning output device through the magnetic bead FB1, the capacitor C11 includes the capacitor C11a and the capacitor C11b, and the input end of the gas state warning output device corresponding to the PWM1 pin and the PWM2 pin is respectively connected to the ground through the C11a and the capacitor C11b. The magnetic beads FB1 and FB2 can effectively suppress high-frequency noise and reduce conducted EMI; the capacitors C11a and C11b can guide high-frequency noise to flow to the ground, thereby reducing radiated EMI and conducted EMI. The gas state warning output device can be provided as a loudspeaker, the PWM1 and PWM2 pins are connected to the driving circuit of the loudspeaker, and the loudspeaker is driven to sound by the modulated PWM signal to output warning signals with different audio characteristics; the PWM1 and PWM2 pins can also control different output devices to realize more complex warning output functions, for example, the gas state warning output device is provided as a loudspeaker and a warning light, one of the PWM1 and PWM2 pins is used to control audio output, and the other is used to control LED brightness.

[0057] Please refer to Figure 1 and Figure 3 , further, the power module 30 adopts direct current power supply and / or battery power supply, and the power module 30 further includes a charge-discharge circuit, a lithium battery and a charging state display device connected electrically.

[0058] Understandably, by setting the power module 30 to adopt DC power supply or battery power supply, it can be used in the working environment with power supply conditions by DC power supply, and in the working environment without power supply conditions by battery power supply according to different specific use scenarios. The charging and discharging circuit, the lithium battery and the charging state display device are electrically connected, and the charging state display device can display the charging state information of the lithium battery.

[0059] Please continue to combine Figure 1 and Figure 3 Further, the power module 30 is externally connected with an external DC power supply, the charging and discharging circuit includes a battery charger control IC, a PNP transistor Q1 and a charging state display device, the battery charger control IC includes a BAT pin and a CHRG pin; the positive electrode of the lithium battery is connected with the BAT pin, the negative electrode of the lithium battery is grounded, the power switch is connected with the BAT pin of the battery charger control IC, the CHRG pin is connected with the base electrode of the PNP transistor Q1 through the resistance R2, the emitter electrode of the PNP transistor Q1 is connected with the positive electrode of the external DC power supply, the base electrode and the collector electrode of the PNP transistor Q1 are respectively grounded through the capacitor C16 and the capacitor C17, the negative electrode of the charging state display device is grounded, and the positive electrode of the charging state display device is connected with the collector electrode of the PNP transistor Q1 through the resistance R11.

[0060] Understandably, when the external DC power supply is connected, the CHRG pin of the battery charger control IC sends a low-level signal to make the charging state display device work and display, and becomes a high resistance state when the external DC power supply is removed or the charging is saturated, so that the charging state display device does not work, and the real-time display of the power supply working state is realized.

[0061] Please continue to combine Figure 1 and Figure 3 Further, the battery charger control IC further includes an IN pin, a GND pin, an EN pin, an SW pin, an SEN pin, a TEMP pin and a BS pin, the IN pin is grounded through the capacitor C5, the GND pin is grounded, the EN pin is grounded through the capacitor C1, the SW pin is connected with the BAT pin in sequence through the inductor L1 and the resistance R4, the SEN pin is connected between the inductor L1 and the resistance R4, the TEMP pin is grounded through the resistance R1, the BS pin and the SW pin are connected with the bootstrap capacitor C4, and the SW pin is grounded in sequence through the resistance R5 and the capacitor C9; the positive electrode of the lithium battery is grounded through the parallel connection of the capacitor C6, the capacitor C7 and the capacitor C8, and the positive electrode of the external DC power supply is grounded through the parallel connection of the capacitor C2 and the capacitor C3.

[0062] It can be understood that the bootstrap capacitor C4 can provide sufficient driving voltage by connecting between the BS pin and the SW pin; the SW pin is grounded through the resistor R5 and the capacitor C9 in turn, which can effectively eliminate noise. By setting the SW pin to connect to the BAT pin through the inductor L1 and the resistor R4 in turn, the SEN pin is connected between the inductor L1 and the resistor R4, and the resistor R4 is set as an external sensing resistor on the SEN pin and the BAT pin, which can realize current detection and control during the charging process. Since a voltage drop is generated when current passes through the resistor R4, the voltage drop is proportional to the current passing through the resistor R4. The SEN pin is connected to one end of the resistor R4 for reading the voltage drop across the resistor R4, and the battery charger control IC calculates the actual charging current according to the voltage drop. The BAT pin is connected to the positive electrode of the lithium battery for monitoring the voltage of the lithium battery. The above settings help the battery charger control IC to obtain the state information of the battery, and according to whether the battery is fully charged or needs to adjust the charging strategy, the battery charger control IC can calculate the actual charging current through the internal algorithm according to the voltage drop read on the SEN pin. If a specific charging current needs to be set, it can be achieved by adjusting the value of the sensing resistor. And the battery charger control IC will adjust the charging current through the internal control algorithm according to the current sensing signal on the SEN pin and the voltage monitoring signal on the BAT pin to ensure safe and efficient charging process.

[0063] Please refer to Figure 1 and Figure 4 , further, the gas detection and alarm control circuit 1 further comprises a power supply battery voltage detection module 40, the power supply battery voltage detection module 40 comprises a voltage detection circuit and an undervoltage state display device, the voltage detection circuit comprises a battery voltage monitoring IC, an NPN transistor Q2, an NPN transistor Q3 and the undervoltage state display device, the battery voltage monitoring IC comprises a VDD pin, a RESET pin and a GND pin; the VDD pin is connected with a power switch, the base of the NPN transistor Q3 is connected with the RESET pin through a resistor R15, the RESET pin is grounded through a resistor R16, the emitter of the NPN transistor Q3 is grounded, the base of the NPN transistor Q2 is connected with the power switch through a resistor R13 and a resistor R14 in turn, the base of the NPN transistor Q3 is connected between the resistor R14 and the resistor R13, the emitter of the NPN transistor Q2 is grounded, the collector of the NPN transistor Q2 is connected with the power switch through a resistor R12, the positive electrode of the undervoltage state display device is connected with the collector of the NPN transistor Q2, and the negative electrode of the undervoltage state display device is grounded.

[0064] It can be understood that, for the diversification of specific use scenarios, direct current power supply is used in working environment with power supply condition, and battery power supply is used in working environment without power supply condition. When battery power supply is used, in order to ensure that the voltage of the power supply battery can be maintained in a continuous and stable range, and to avoid affecting the normal work of the gas detection and alarm control circuit 1, the voltage state of the power supply battery needs to be obtained. The voltage is detected by setting the power supply battery voltage detection module 40, and the power supply battery voltage detection module 40 adopts a battery voltage monitoring IC. After the power switch is turned on, the battery voltage monitoring IC detects that the battery voltage is in the set voltage range, the RESET pin of the battery voltage monitoring IC serves as a reset pin and outputs a high level signal, and the NPN triode makes the undervoltage state display device work and display. When the battery voltage monitoring IC detects that the battery voltage is not in the set voltage range, the RESET pin outputs a low level signal, and the undervoltage state display device does not work. According to the display working state of the undervoltage state display device, it can be known whether the power supply battery is undervoltage, so as to realize real-time monitoring of the voltage of the power supply battery, and provide protection for the normal work of the gas detection and alarm control circuit 1.

[0065] Please refer to Figure 5 The utility model provides a kind of medical device 100, and the circuit of medical device 100 is above-mentioned gas detection and alarm control circuit 1. Medical device 100 has the same beneficial effects with gas detection and alarm control circuit 1, and is not described here.

[0066] Compared with prior art, the utility model discloses a kind of gas detection and alarm control circuit and medical device, with the following advantages:

[0067] 1. The gas detection and alarm control circuit of the utility model comprises a power module and a gas state detection module which are electrically connected, the gas state detection module comprises a gas state detection device, a gas state warning control circuit and a gas state warning output device which are connected in series, the power module comprises a power switch, the gas state warning control circuit comprises a control module U2, the control module U2 is a voice IC, the control module U2 comprises an IO1 pin, the gas state warning control circuit comprises a senior warning circuit, the senior warning circuit comprises a resistor R9, a resistor R10 and a capacitor C15, the IO1 pin is connected with the power switch through the resistor R9; the IO1 pin is connected with the gas state detection device through the resistor R10, the IO1 pin is grounded through the capacitor C15, the gas state detection device detects the gas state and generates a state signal, the IO1 pin acquires the state signal through the senior warning circuit and controls the gas state warning output device to output the gas state warning information based on the state signal. Since the control module U2 is a voice IC, the gas state detection device is arranged to detect the gas state and generate a state signal, and the IO1 pin of the control module U2 receives the state signal through the senior warning circuit, and then the gas state warning output device is controlled to output the gas state warning information based on the state signal, the IO1 pin receives the state signal as an input pin, the control module U2 controls the gas state warning output device to output the voice warning information, accurate control and real-time monitoring of voice playing can be realized, the richness of the alarm sound can be improved, more alarm function requirements can be met, the patient will not feel bored, and the medical alarm sound certification can be met.

[0068] 2. The control module U2 of the utility model further comprises an OKY1 pin, the gas state warning control circuit further comprises a junior warning circuit, the junior warning circuit comprises a resistor R6, a resistor R7, a resistor R8 and a capacitor C12, the OKY1 pin is connected with the power switch through the resistor R6; the OKY1 pin is grounded through the resistor R7, the OKY1 pin is connected with the gas state detection device through the resistor R8, the OKY1 pin is grounded through the capacitor C12, the OKY1 pin acquires the state signal through the junior warning circuit and controls the gas state warning output device to output the gas state warning information based on the state signal. Since the OKY1 pin is connected with the gas state detection device through the resistor R8, the OKY1 pin can use the state signal of the gas state detection device as the input of the trigger signal, optionally, a PWM pin is arranged on the control module U2, and after being triggered, the control module U2 controls the gas state warning output device to output the gas state warning information through the PWM pin. The OKY1 pin is an input pin, and the voice IC can also improve the richness of the alarm sound, meet more alarm function requirements, and avoid the patient being bored by the alarm sound.

[0069] 3. The gas state detection device detects the gas state, which includes pressure detection, flow detection and / or concentration detection of the gas. By using one or more of the pressure detection, flow detection and concentration detection methods, the gas pressure state can be effectively detected. The pressure detection can directly detect whether the supplied gas pressure meets the requirements. Although the flow detection and concentration detection do not directly detect the pressure, they can detect information related to the pressure, and can indirectly detect the pressure.

[0070] 4. The control module U2 includes a VDD pin, a GND pin and at least one group of PWM pins. The VDD pin is connected to a power switch. One end of the gas state detection device is connected to the power switch through a resistor R10 and a resistor R9 in sequence. The other end of the gas state detection device is grounded. An IO1 pin is connected between the resistor R9 and the resistor R10. The PWM pin is connected to the gas state warning output device. When the state signal of the gas state detection device triggers the IO1 pin, the control module U2 outputs a control signal through the PWM pin to control the output of the gas state warning device. By adjusting the duty cycle of the PWM pin, the gas state warning output device can be accurately controlled. The PWM signal output by the PWM pin can also achieve energy saving and improve efficiency, and unnecessary power consumption can be reduced by adjusting the duty cycle. When the PWM pin is set to multiple groups, the output control signal has more functions and flexibility, and more precise control can be achieved. The above settings make the gas state warning control circuit not use MCU and only rely on the circuit. Since no MCU is used, the cost can be effectively reduced. By adjusting the duty cycle of the PWM signal output by the PWM pin, unnecessary power consumption can be reduced, and the design without MCU can achieve low power consumption of the gas state warning control circuit. Therefore, the above settings make the gas detection and alarm control circuit have the advantages of low cost and low power consumption.

[0071] 5、The gas state warning control circuit further comprises a magnetic bead, the PWM pin is connected to the input end of the gas state warning output device through the magnetic bead, and / or the gas state warning control circuit further comprises a capacitor C11, and the input end of the gas state warning output device is grounded through the capacitor C11. EMI (Electromagnetic Interference) refers to the interference caused by electromagnetic waves generated by electronic equipment to the normal work of other equipment. As an output device, the gas state warning output device can generate or be affected by EMI. The magnetic bead is a passive element with high resistivity and small inductance value. The PWM pin is connected to the input end of the gas state warning output device through the magnetic bead, which can suppress high-frequency noise and reduce conducted EMI. By setting the capacitor C11, the input end of the gas state warning output device is grounded through the capacitor C11, so that the high-frequency noise can flow to the ground through the capacitor C11, thereby reducing the propagation in the circuit. The above method can effectively solve the EMI problem and provide high-quality warning output information.

[0072] 6、The power module of the utility model adopts direct current power supply and / or battery power supply, and the power module further comprises a charge-discharge circuit, a lithium battery and a charging state display device which are electrically connected. By adopting direct current power supply or battery power supply, the power module can be used in different specific use scenarios. In the working environment with power supply conditions, direct current power supply is used, and in the working environment without power supply conditions, battery power supply is used. The charge-discharge circuit, the lithium battery and the charging state display device are electrically connected, and the charging state display device can display the charging state information of the lithium battery.

[0073] 7、The power module of the utility model is externally connected with an external DC power supply, the charge-discharge circuit comprises a battery charger control IC, a PNP triode Q1 and a charging state display device, the battery charger control IC comprises a BAT pin, a SEN pin, a SW pin, a BS pin, a CHRG pin and a GND pin; the positive pole of the lithium battery is connected with the BAT pin, the negative pole of the lithium battery is grounded, the power switch is connected with the BAT pin of the battery charger control IC, the CHRG pin is connected with the base of the PNP triode Q1 through a resistor R2, the emitter of the PNP triode Q1 is connected with the positive pole of the external DC power supply, the base and the collector of the PNP triode Q1 are grounded through a capacitor C16 and a capacitor C17 respectively, the negative pole of the charging state display device is grounded, and the positive pole of the charging state display device is connected with the collector of the PNP triode Q1 through a resistor R11. When the external DC power supply is connected, the CHRG pin of the battery charger control IC sends a low-level signal, the charging state display device works through the PNP triode, and when the external DC power supply is removed or the charging is saturated, the charging state display device becomes a high resistance state and does not work, thereby realizing real-time display of the power working state.

[0074] 8、The battery charger control IC of the utility model further comprises an IN pin, a GND pin, an EN pin, an SW pin, an SEN pin, a TEMP pin and a BS pin, the IN pin is grounded through a capacitor C5, the GND pin is grounded, the EN pin is grounded through a capacitor C1, the SW pin is connected with a BAT pin in sequence through an inductor L1 and a resistor R4, the SEN pin is connected between the inductor L1 and the resistor R4, the TEMP pin is grounded through a resistor R1, a bootstrap capacitor C4 is connected between the BS pin and the SW pin, and the SW pin is grounded in sequence through a resistor R5 and a capacitor C9; the positive pole of the lithium battery is grounded through parallel capacitors C6, C7 and C8, and the positive pole of the external DC power supply is grounded through parallel capacitors C2 and C3. The bootstrap capacitor C4 connected between the BS pin and the SW pin can provide sufficient driving voltage; the SW pin is grounded in sequence through the resistor R5 and the capacitor C9, which can effectively eliminate noise. By setting the SW pin connected with the BAT pin in sequence through the inductor L1 and the resistor R4, and the SEN pin connected between the inductor L1 and the resistor R4, the resistor R4 is arranged as an external sensing resistor on the SEN pin and the BAT pin, current detection and control during the charging process can be realized. Since a voltage drop is generated when current passes through the resistor R4, the voltage drop is proportional to the current passing through the resistor R4. The SEN pin is connected to one end of the resistor R4 and is used to read the voltage drop between the two ends of the resistor R4, and the battery charger control IC calculates the actual charging current according to the voltage drop. The BAT pin is connected with the positive pole of the lithium battery and is used to monitor the voltage of the lithium battery. The above setting helps the battery charger control IC to obtain the state information of the battery, and according to whether the battery is fully charged and whether the charging strategy needs to be adjusted, the battery charger control IC can calculate the actual charging current through an internal algorithm according to the voltage drop read on the SEN pin. If a specific charging current needs to be set, it can be realized by adjusting the value of the sensing resistor. Moreover, the battery charger control IC can adjust the charging current through an internal control algorithm according to the current sensing signal on the SEN pin and the voltage monitoring signal on the BAT pin, to ensure the safety and efficiency of the charging process.

[0075] 9、The gas detection and alarm control circuit of the utility model further includes a power supply battery voltage detection module, the power supply battery voltage detection module includes a voltage detection circuit and an under-voltage state display device, the voltage detection circuit includes a battery voltage monitoring IC, an NPN triode Q2, an NPN triode Q3 and the under-voltage state display device, the battery voltage monitoring IC includes a VDD pin, a RESET pin and a GND pin;The VDD pin is connected with a power switch, the base of the NPN triode Q3 is connected with the RESET pin through a resistor R15, the RESET pin is grounded through a resistor R16, the emitter of the NPN triode Q3 is grounded, the base of the NPN triode Q2 is connected with the power switch in turn through a resistor R14 and a resistor R13, the base of the NPN triode Q3 is connected between the resistor R14 and the resistor R13, the emitter of the NPN triode Q2 is grounded, the collector of the NPN triode Q2 is connected with the power switch through a resistor R12, the anode of the under-voltage state display device is connected with the collector of the NPN triode Q2, and the cathode of the under-voltage state display device is grounded.For the diversification of specific use scenarios, direct current power supply is used in the working environment with power supply conditions, and battery power supply can only be used in the working environment without power supply conditions.When battery power supply is used, in order to ensure that the voltage of the power supply battery can be maintained in a continuous and stable range, and to avoid affecting the normal work of the gas detection and alarm control circuit, the voltage state of the power supply battery needs to be obtained.The power supply battery voltage detection module detects the voltage, the power supply battery voltage detection module uses a battery voltage monitoring IC, after the power switch is turned on, the battery voltage monitoring IC detects that the battery voltage is in the set voltage range, the RESET pin of the battery voltage monitoring IC sends a high-level signal as a reset pin, and the under-voltage state display device works and displays through the NPN triode, when the battery voltage monitoring IC detects that the battery voltage is not in the set voltage range, the RESET pin sends a low-level signal, and the under-voltage state display device does not work, whether the power supply battery is under-voltage can be known according to the display working state of the under-voltage state display device, so that the real-time monitoring of the power supply battery voltage is realized, and the normal work of the gas detection and alarm control circuit is ensured.

[0076] 10、The utility model further provides a medical device has same beneficial effect with above-mentioned gas detection and alarm control circuit, and does not make superfluous repetition here.

[0077] The above is only the preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement and improvement within the principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A gas detection and alarm control circuit, characterized by: The gas detection and alarm control circuit comprises a power module and a gas state detection module connected electrically, the gas state detection module comprises a gas state detection device, a gas state warning control circuit and a gas state warning output device connected in series, the power module comprises a power switch, the gas state warning control circuit comprises a control module U2, the control module U2 is a voice IC, the control module U2 comprises an IO1 pin, the gas state warning control circuit comprises a high-level warning circuit, the high-level warning circuit comprises a resistor R9, a resistor R10 and a capacitor C15, the IO1 pin is connected to the power switch through the resistor R9; the IO1 pin is connected to the gas state detection device through the resistor R10, and the IO1 pin is grounded through the capacitor C15, the gas state detection device detects the gas state and generates a state signal, the IO1 pin acquires the state signal through the high-level warning circuit, and the gas state warning output device outputs the gas state warning information based on the state signal.

2. A gas detection and alarm control circuit as defined in claim 1, wherein: The control module U2 further comprises an OKY1 pin, and the gas state warning control circuit further comprises a low-level warning circuit, the low-level warning circuit comprises a resistor R6, a resistor R7, a resistor R8 and a capacitor C12, the OKY1 pin is connected to the power switch through the resistor R6; the OKY1 pin is grounded through the resistor R7, the OKY1 pin is connected to the gas state detection device through the resistor R8, and the OKY1 pin is grounded through the capacitor C12, the OKY1 pin acquires the state signal through the low-level warning circuit, and the gas state warning output device outputs the gas state warning information based on the state signal.

3. A gas detection and alarm control circuit as defined in claim 1, wherein: The gas state detection device detects the gas state, which comprises pressure detection, flow detection and / or concentration detection of the gas.

4. The gas detection and alarm control circuit of claim 1, wherein: The control module U2 comprises a VDD pin, a GND pin and at least one group of PWM pins, the power module comprises a power switch, the VDD pin is connected to the power switch, one end of the gas state detection device is connected to the power switch through the resistor R10 and the resistor R9 in sequence, the other end of the gas state detection device is grounded, the IO1 pin is connected between the resistor R9 and the resistor R10, and the PWM pin is connected to the gas state warning output device.

5. A gas detection and alarm control circuit as defined in claim 4, wherein: The gas state warning control circuit further comprises a magnetic bead, the PWM pin is connected to the input end of the gas state warning output device through the magnetic bead, and / or the gas state warning control circuit further comprises a capacitor C11, and the input end of the gas state warning output device is grounded through the capacitor C11.

6. The gas detection and alarm control circuit of claim 1, wherein: The power module adopts direct current power supply and / or battery power supply, and further comprises a charge-discharge circuit, a lithium battery and a charging state display device connected electrically.

7. A gas detection and alarm control circuit as defined in claim 6, wherein: The power module is externally connected with an external DC power supply, the charge-discharge circuit comprises a battery charger control IC, a PNP transistor Q1 and a charging state display device, the battery charger control IC comprises a BAT pin and a CHRG pin; the positive pole of the lithium battery is connected with the BAT pin, the negative pole of the lithium battery is grounded, the power switch is connected with the BAT pin of the battery charger control IC, the CHRG pin is connected with the base of the PNP transistor Q1 through a resistor R2, the emitter of the PNP transistor Q1 is connected with the positive pole of the external DC power supply, the base and the collector of the PNP transistor Q1 are grounded through a capacitor C16 and a capacitor C17 respectively, the negative pole of the charging state display device is grounded, and the positive pole of the charging state display device is connected with the collector of the PNP transistor Q1 through a resistor R11.

8. A gas detection and alarm control circuit as defined in claim 7, wherein: The battery charger control IC further comprises an IN pin, a GND pin, an EN pin, an SW pin, an SEN pin, a TEMP pin and a BS pin, the IN pin is grounded through a capacitor C5, the GND pin is grounded, the EN pin is grounded through a capacitor C1, the SW pin is connected with the BAT pin in sequence through an inductor L1 and a resistor R4, the SEN pin is connected between the inductor L1 and the resistor R4, the TEMP pin is grounded through a resistor R1, a bootstrap capacitor C4 is connected between the BS pin and the SW pin, and the SW pin is grounded in sequence through a resistor R5 and a capacitor C9; the positive pole of the lithium battery is grounded through parallel-connected capacitors C6, C7 and C8, and the positive pole of the external DC power supply is grounded through parallel-connected capacitors C2 and C3.

9. The gas detection and alarm control circuit of claim 6, wherein: The gas detection and alarm control circuit further comprises a power supply battery voltage detection module, the power supply battery voltage detection module comprises a voltage detection circuit and an under-voltage state display device, the voltage detection circuit comprises a battery voltage monitoring IC, a NPN transistor Q2 and a NPN transistor Q3, the battery voltage monitoring IC comprises a VDD pin, a RESET pin and a GND pin; the VDD pin is connected with the power switch, the base of the NPN transistor Q3 is connected with the RESET pin through a resistor R15, the RESET pin is grounded through a resistor R16, the emitter of the NPN transistor Q3 is grounded, the base of the NPN transistor Q2 is connected with the power switch in sequence through a resistor R13 and a resistor R14, the base of the NPN transistor Q3 is connected between the resistor R14 and the resistor R13, the emitter of the NPN transistor Q2 is grounded, and the collector of the NPN transistor Q2 is connected with the power switch through a resistor R12; the positive pole of the under-voltage state display device is connected with the collector of the NPN transistor Q2, and the negative pole of the under-voltage state display device is grounded.

10. A medical device characterized by: The circuit of the medical device is the gas detection and alarm control circuit according to any one of claims 1-9.

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