Power failure alarm circuit of vehicle-mounted oxygenerator

Abstract

The utility model provides a power-off alarm circuit for a vehicle-mounted oxygenerator, which belongs to the field of oxygenerator power supply and comprises a controller, a charging and discharging circuit, a switching signal detection circuit, a power-off signal detection circuit and an alarm circuit. The output end of the switching signal detection circuit and the output end of the power-off signal detection circuit are both electrically connected with the input end of the controller, the charging and discharging circuit comprises a plurality of super capacitors, the output port of the controller is electrically connected with the input port of the charging and discharging circuit, and the charging and discharging circuit supplies power to the alarm circuit after the oxygen generator is abnormally powered off; when the oxygen generator is started, the S1 is pressed, the switching signal detection circuit inputs signals to the controller, the oxygen generator is started normally, when the S1 is pressed again, the oxygen generator is shut down normally, and the oxygen generator is powered off, the power-off signal detection circuit inputs signals to the controller to judge that the power supply is cut off, and if the S1 is not pressed again, the oxygen generator is judged to be powered off abnormally, and the controller controls the super capacitor to supply power to the alarm circuit. The alarm circuit gives an alarm to prompt abnormal power failure.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply for vehicle-mounted oxygen concentrators, in particular to a power-off alarm circuit for vehicle-mounted oxygen concentrators. Background Art

[0002] With the rapid development of oxygen concentrator technology, vehicle-mounted oxygen concentrators are also increasingly used. With the continuous updating of technology, vehicle-mounted oxygen concentrators have become less noisy and have a smooth oxygen supply flow. In the complex in-vehicle environment, it is difficult for users to detect whether the oxygen concentrator is operating normally. Therefore, a vehicle-mounted oxygen concentrator power-off alarm system is needed to remind users that the oxygen concentrator is not operating normally through an alarm, so that users can locate the cause of the oxygen concentrator failure and quickly troubleshoot the failure. Utility Model Content

[0003] The technical problem to be solved by the utility model is how to detect abnormal power failure of an oxygen concentrator.

[0004] The utility model solves the above technical problems through the following technical solutions: a vehicle-mounted oxygen concentrator power-off alarm circuit, comprising a controller, a charging and discharging circuit, a switch signal detection circuit, a power-off signal detection circuit and an alarm circuit, the switch signal detection circuit comprising a self-resetting switch S1, the output ends of the switch signal detection circuit and the power-off signal detection circuit are both electrically connected to the input end of the controller, the charging and discharging circuit comprises a plurality of supercapacitors, the output port of the controller is electrically connected to the input port of the charging and discharging circuit, and the charging and discharging circuit supplies power to the alarm circuit after the oxygen concentrator is abnormally powered off.

[0005] When the vehicle-mounted oxygen concentrator is powered on, the input power supply provides a stable input voltage to the supercapacitor. When starting up, the self-reset switch S1 is pressed, and the switch signal detection circuit inputs a control signal to the controller. The controller determines that the oxygen concentrator is started normally based on the detected signal. When the self-reset switch S1 is pressed again, it is determined that the oxygen concentrator is shut down normally. When the vehicle-mounted oxygen concentrator is powered off, the power-off signal detection circuit inputs a control signal to the controller, which can monitor that the power supply to the oxygen concentrator is disconnected. If the self-reset switch S1 is not pressed again, it is determined that the oxygen concentrator is powered off abnormally. When the controller detects an abnormal power-off signal, it controls the supercapacitor in the charge and discharge circuit to continuously supply power to the alarm circuit, and the alarm circuit alarms to prompt the user that the oxygen concentrator is powered off abnormally.

[0006] Preferably, the model of the controller is GD32C103CBT6, and the power-off signal detection circuit includes a resistor R6, a resistor R8, a resistor R10, a capacitor C10 and a diode V3, one end of the resistor R6 is connected to the power supply, and the other end is connected to one end of the resistor R10, the other end of the resistor R10 is grounded, the resistor R6 and the resistor R10 are electrically connected in series to one end of the resistor R8, the other end of the resistor R8 is connected in series with the capacitor C10 and then grounded, the other end of the resistor R8 is also connected to the anode of the diode V3, the cathode of the diode V3 is connected to the first DC power supply, and the other end of the resistor R8 is also connected to the tenth pin of the controller.

[0007] Preferably, the switch signal detection circuit also includes a resistor R7, a resistor R9, an optocoupler E1 and a capacitor C9, one end of the resistor R7 is connected to a power supply, and the other end is connected to one end of the resistor R9, the other end of the resistor R9 is connected in series with the automatic reset switch S1 and then grounded, one end of the resistor R9 is connected to the first pin of the optocoupler E1, the other end of the resistor R9 is connected to the second pin of the optocoupler E1, the capacitor C9 is connected in series between the third pin and the fourth pin of the optocoupler E1, the fourth pin is connected to the eleventh pin of the controller, the third pin is grounded, and the model of the optocoupler E1 is TPL291.

[0008] Preferably, the plurality of supercapacitors include supercapacitors CE1, CE2, CE3 and CE4, and the charge and discharge circuit further includes capacitor C6, voltage stabilizing chip U3, diode V2, inductor L1, resistor R2, resistor R4, resistor R1, diode V1, relay K1, resistor R3, resistor R5, transistor Q1, voltage stabilizing chip U2, voltage stabilizing chip U1, capacitor C1 and capacitor C2, the model of voltage stabilizing chip U3 is LM2576, the model of voltage stabilizing chip U2 is SPX1117M3-L-5, and the model of voltage stabilizing chip U1 is SPX1117M3-L-3-3, the model of relay K1 is G6K-2P-Y, one end of capacitor C6 is connected to the power supply, and the other end is grounded, the first pin of voltage regulator chip U3 is connected to the power supply, the third pin and the fifth pin are grounded, the second pin is connected to the cathode of diode V2, the anode of diode V2 is grounded, the second pin is also connected in series with inductor L1 and then connected to one end of resistor R1, the other end of resistor R1 is connected to the anode of diode V1, the cathode of diode V1 is connected in series with super capacitors CE2, CE1, CE3, CE4 in sequence The resistor R1 is connected to the ground in series with the resistor R2 and the resistor R4, and then connected to the ground. The resistor R1 is connected to the ground in series with the capacitor C5, and then connected to the ground. The connection point between the resistor R2 and the resistor R4 is electrically connected to the fourth pin of the voltage regulator chip U3. The cathode of the diode V1 is connected to one end of the normally open contact of the relay K1, and the other end of the normally open contact of the relay K1 is connected to the third pin of the voltage regulator chip U2. The connection point between the second pin of the voltage regulator chip U2 and the third pin of the voltage regulator chip U1 is electrically connected to the second DC power supply, and the second pin of the voltage regulator chip U1 is connected to the first DC power supply. A capacitor C1 is connected in series between the first pin and the second pin of the voltage stabilizing chip U2, a capacitor C2 is connected in series between the first pin and the second pin of the voltage stabilizing chip U1, the first pin of the voltage stabilizing chip U2 is electrically connected to the first pin of the voltage stabilizing chip U1, one end of the coil of the relay K1 is connected to the second DC power supply, and the other end is connected to the collector of the transistor Q1, the base of the transistor Q1 is connected to one end of the resistor R3, the emitter of the transistor Q1 is grounded, one end of the resistor R3 is connected in series with the resistor R5 and then grounded, and one end of the resistor R3 is also connected to the fourth pin of the controller.

[0009] Preferably, the alarm circuit includes a buzzer B1 and a control circuit, the control circuit includes a resistor R11, a resistor R12 and a transistor Q2, one end of the resistor R11 is connected to the twelfth pin of the controller, and the other end is connected to the base of the transistor Q2, the emitter of the transistor Q2 is connected to the second DC power supply, the collector of the transistor Q2 is connected to the positive electrode of the buzzer B1, and the negative electrode of the buzzer B1 is connected in series with the resistor R12 and then grounded.

[0010] Preferably, the alarm circuit also includes a multi-color digital tube and a drive circuit, the multi-color digital tube is connected to the output port of the drive circuit, the drive circuit includes a resistor R13, a resistor R14, a capacitor C11, a capacitor C12, a capacitor C13, a capacitor C14, a diode V4 and a drive chip N1, the model of the drive chip N1 is SM1616, one end of the resistor R13 is connected to the first DC power supply, and the other end is connected in series with the capacitor C13 and then grounded, one end of the resistor R14 is connected to the first DC power supply, and the other end is connected in series with the capacitor C14 and then grounded, the series connection between the resistor R13 and the capacitor C13 is connected to the ninth pin of the drive chip N1, the series connection between the resistor R14 and the capacitor C14 is connected to the tenth pin of the drive chip N1, the ninth pin of the drive chip N1 is connected to the twenty-first pin of the controller, the tenth pin is connected to the twenty-second pin of the controller, the eleventh pin of the drive chip N1 is grounded, the twenty-fifth pin is connected in series with the capacitor C11 and then grounded, the capacitor C12 is connected in parallel at both ends of the capacitor C11, the twenty-fifth pin is also connected to the cathode of the diode V4, and the anode of the diode V4 is connected to the second DC power supply.

[0011] Preferably, the power supply provides a DC voltage of 24V.

[0012] Preferably, the first DC power supply provides a DC voltage of 3.3V.

[0013] Preferably, the second DC power supply provides a DC voltage of 5V.

[0014] Preferably, the buzzer B1 is a conventional buzzer or speaker, and the multi-color digital tube is an LED digital tube.

[0015] The advantages provided by the utility model are:

[0016] 1. When the vehicle-mounted oxygen concentrator is powered on, the input power supply provides a stable input voltage to the supercapacitor. When the self-reset switch S1 is pressed when starting up, the switch signal detection circuit inputs a control signal to the controller. The controller determines that the oxygen concentrator is turned on normally according to the detected signal. When the self-reset switch S1 is pressed again, it is determined that the oxygen concentrator is shut down normally. When the vehicle-mounted oxygen concentrator is powered off, the power-off signal detection circuit inputs a control signal to the controller, which can monitor that the power supply to the oxygen concentrator is disconnected. If the self-reset switch S1 is not pressed again, it is determined that the oxygen concentrator is powered off abnormally. When the controller detects an abnormal power-off signal, it controls the supercapacitor in the charge and discharge circuit to continuously supply power to the alarm circuit, and the alarm circuit alarms to prompt the user that the oxygen concentrator is powered off abnormally.

[0017] 2. The charging and discharging circuit of the utility model adopts supercapacitor as the energy storage unit, which has high energy conversion efficiency, short charging time and long discharging time. The supercapacitor has good temperature adaptability and can maintain high-quality performance in low and high temperature environments. The service life is more than ten years, and the number of charge and discharge times can reach more than 1 million times.

[0018] 3. The switch signal detection circuit and the power-off signal detection circuit of the utility model use fewer devices, no complex devices, low cost, high reliability, and the design of the filter circuit, clamping circuit, and isolation circuit makes the detection accurate and has strong anti-interference ability. The switch signal detection circuit and the power-off signal detection circuit are used together to accurately judge the normal power-off and abnormal power-off states. When the power is normally off, the discharge circuit of the energy storage unit is cut off, the energy storage unit does not discharge to the outside, there is no power consumption, and the charging time and number of the energy storage unit are reduced.

[0019] 4. The alarm circuit of the utility model uses a multi-color LED digital tube, which can display different colors according to different fault codes. It has good sensitivity, fast response time, wide temperature adaptability, and can display normally at high temperatures of 50°C and low temperatures of -43°C. It has ultra-low power consumption, saves more than 80% energy than traditional light source displays, has a long life, and is highly stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the power-off alarm circuit of the vehicle-mounted oxygen concentrator of the utility model;

[0021] Figure 2 It is a circuit diagram of a controller in a power-off alarm circuit of a vehicle-mounted oxygen concentrator of the utility model;

[0022] Figure 3 It is a circuit diagram of a power-off signal detection circuit in a power-off alarm circuit of a vehicle-mounted oxygen concentrator of the utility model;

[0023] Figure 4 It is a circuit diagram of a switch signal detection circuit in a power-off alarm circuit of a vehicle-mounted oxygen concentrator of the utility model;

[0024] Figure 5 It is a circuit diagram of the charging and discharging circuit in the power-off alarm circuit of the vehicle-mounted oxygen concentrator of the utility model;

[0025] Figure 6 It is a circuit diagram of a part of the alarm circuit in the power-off alarm circuit of the vehicle-mounted oxygen concentrator of the utility model;

[0026] Figure 7 This is another circuit diagram of the alarm circuit in the power-off alarm circuit of the vehicle-mounted oxygen concentrator of the utility model. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the utility model more clear, the technical solution of the utility model is clearly and completely described below in combination with specific embodiments and with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, but not all of them. 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.

[0028] like Figure 1-5 As shown, this embodiment provides a power-off alarm circuit for a vehicle-mounted oxygen concentrator, including a controller, a charge-discharge circuit, a switch signal detection circuit, a power-off signal detection circuit and an alarm circuit. The switch signal detection circuit includes a self-reset switch S1 for monitoring whether the oxygen concentrator is shut down normally. The power-off signal detection circuit is used to monitor whether the power supply to the oxygen concentrator is disconnected. The output ends of the switch signal detection circuit and the power-off signal detection circuit are both electrically connected to the input end of the controller. The controller is used to receive a signal from the switch signal detection circuit to determine whether the oxygen concentrator is shut down normally. The controller also receives a signal from the power-off signal detection circuit to determine whether the oxygen concentrator is powered off. The charge-discharge circuit includes multiple supercapacitors. The output port of the controller is electrically connected to the input port of the charge-discharge circuit. The controller controls the supercapacitor to supply power to the alarm circuit after the oxygen concentrator is powered off abnormally.

[0029] When the vehicle-mounted oxygen concentrator is powered on, the input power supply provides a stable input voltage to the supercapacitor. When starting up, the self-reset switch S1 is pressed, and the switch signal detection circuit inputs a control signal to the controller. The controller determines that the oxygen concentrator is started normally based on the detected signal. When the self-reset switch S1 is pressed again, it is determined that the oxygen concentrator is shut down normally. When the vehicle-mounted oxygen concentrator is powered off, the power-off signal detection circuit inputs a control signal to the controller, which can monitor that the power supply to the oxygen concentrator is disconnected. If the self-reset switch S1 is not pressed again, it is determined that the oxygen concentrator is powered off abnormally. When the controller detects an abnormal power-off signal, it controls the supercapacitor in the charge and discharge circuit to continuously supply power to the alarm circuit, and the alarm circuit alarms to prompt the user that the oxygen concentrator is powered off abnormally.

[0030] Combination Figure 2-3 The model of the controller is GD32C103CBT6. The power-off signal detection circuit includes a resistor R6, a resistor R8, a resistor R10, a capacitor C10 and a diode V3. One end of the resistor R6 is connected to the power supply, and the other end is connected to one end of the resistor R10. The other end of the resistor R10 is grounded. The resistor R6 and the resistor R10 are connected in series and electrically connected to one end of the resistor R8. The other end of the resistor R8 is connected in series with the capacitor C10 and then grounded. The other end of the resistor R8 is also connected to the anode of the diode V3, and the cathode of the diode V3 is connected to the first DC power supply. The other end of the resistor R8 is also connected to the tenth pin of the controller.

[0031] In this embodiment, the power supply provides a DC voltage of 24V, and the first DC power supply provides a DC voltage of 3.3V. When the power supply DC24V is supplying power normally, the power supply voltage is reduced to a voltage suitable for collection by the controller through voltage division by resistors R6, R8 and R10. Resistor R8 and capacitor C10 form an RC filter circuit, and diode V3 clamps the voltage within a range of less than 4V. At this time, the power-off signal detection circuit outputs a voltage to the tenth pin A / D sampling port voltage of the controller. When the power is off, the output voltage of the power-off signal detection circuit is 0, and the A / D sampling port voltage of the controller detects that the voltage is 0, and it is determined that the power supply DC24V supplied to the oxygen concentrator is disconnected.

[0032] Combination Figure 4 The switch signal detection circuit also includes a resistor R7, a resistor R9, an optocoupler E1 and a capacitor C9. One end of the resistor R7 is connected to the power supply, and the other end is connected to one end of the resistor R9. The other end of the resistor R9 is connected in series with the automatic reset switch S1 and then grounded. One end of the resistor R9 is connected to the first pin of the optocoupler E1, and the other end of the resistor R9 is connected to the second pin of the optocoupler E1. The capacitor C9 is connected in series between the third pin and the fourth pin of the optocoupler E1, and the fourth pin is connected to the eleventh pin of the controller. The third pin of the optocoupler E1 is grounded. The model of the optocoupler E1 is TPL291. When the automatic reset switch S1 is pressed when the machine is turned on, current flows through the first pin and the second pin of the optocoupler E1, the third pin and the fourth pin of the optocoupler E1 are turned on, and the fourth pin becomes a low level. When the eleventh pin I / O port DY-SW-1 of the controller detects a low level, it is judged that the oxygen concentrator is turned on. When the automatic reset switch S1 is pressed again, it is judged that the oxygen concentrator is normally shut down. If the oxygen concentrator is turned off, it is a normal power off. In other cases (such as power off not under normal shutdown), it is judged as an abnormal power off.

[0033] Combination Figure 5, multiple supercapacitors include supercapacitors CE1, CE2, CE3 and CE4, the charging and discharging circuit also includes capacitor C6, voltage regulator chip U3, diode V2, inductor L1, resistor R2, resistor R4, resistor R1, diode V1, relay K1, resistor R3, resistor R5, transistor Q1, voltage regulator chip U2, voltage regulator chip U1, capacitor C1 and capacitor C2, the model of voltage regulator chip U3 is LM2576, the model of voltage regulator chip U2 is SPX1117M3-L-5, the model of voltage regulator chip U1 is SPX1117M 3-L-3-3, the model of relay K1 is G6K-2P-Y, one end of capacitor C6 is connected to the power supply, and the other end is grounded, the first pin of voltage regulator chip U3 is connected to the power supply, the third pin and the fifth pin are grounded, the second pin is connected to the cathode of diode V2, the anode of diode V2 is grounded, the second pin is also connected in series with inductor L1 and then connected to one end of resistor R1, the other end of resistor R1 is connected to the anode of diode V1, the cathode of diode V1 is connected in series with super capacitors CE2, CE1, CE3, CE4 in sequence and then grounded, one end of resistor R1 is also connected in series with inductor L1 and then ... The resistor R2 and the resistor R4 are connected in series and then grounded. One end of the resistor R1 is connected in series with the capacitor C5 and then grounded. The connection point between the resistor R2 and the resistor R4 is electrically connected to the fourth pin of the voltage regulator chip U3. The cathode of the diode V1 is connected to one end of the normally open contact of the relay K1. The other end of the normally open contact of the relay K1 is connected to the third pin of the voltage regulator chip U2. The connection point between the second pin of the voltage regulator chip U2 and the third pin of the voltage regulator chip U1 is electrically connected to the second DC power supply. The second pin of the voltage regulator chip U1 is connected to the first DC power supply. The first pin of the voltage regulator chip U2 is connected to the second pin A capacitor C1 is connected in series between the first pin and the second pin of the voltage stabilizing chip U1, a capacitor C2 is connected in series between the first pin and the second pin of the voltage stabilizing chip U1, the first pin of the voltage stabilizing chip U2 is electrically connected to the first pin of the voltage stabilizing chip U1, one end of the coil of the relay K1 is connected to the second DC power supply, and the other end is connected to the collector of the transistor Q1, the base of the transistor Q1 is connected to one end of the resistor R3, the emitter of the transistor Q1 is grounded, one end of the resistor R3 is connected in series with the resistor R5 and then grounded, one end of the resistor R3 is also connected to the fourth pin of the controller, and in this embodiment, the second DC power supply provides a DC voltage of 5V.

[0034] When the oxygen concentrator is powered on, the power supply DC24V provides a stable input voltage to the supercapacitor after passing through the voltage regulator chip U3. The resistor R1 is a charging current limiting resistor to control the charging time of the supercapacitor. The relay K1 and the diode V1 control the discharge circuit of the supercapacitor. When the controller detects an abnormal power-off signal of the oxygen concentrator, it continuously controls the transistor Q1 to close the normally open contact of the relay K1 to continuously power the alarm circuit. The diode V1 controls the direction of the current in the discharge circuit.

[0035] like Figure 6As shown, the alarm circuit includes a buzzer B1 and a control circuit. The control circuit includes a resistor R11, a resistor R12 and a transistor Q2. One end of the resistor R11 is connected to the twelfth pin of the controller, and the other end is connected to the base of the transistor Q2. The emitter of the transistor Q2 is connected to the second DC power supply, and the collector of the transistor Q2 is connected to the positive electrode of the buzzer B1. The negative electrode of the buzzer B1 is connected in series with the resistor R12 and then grounded. The buzzer B1 can be a conventional buzzer or speaker. When the controller detects an abnormal power-off signal of the oxygen generator, the on-off of the emitter and the collector of the transistor Q2 is controlled, and the buzzer B1 is driven to emit an alarm sound of a specific frequency to prompt the user.

[0036] In order to provide a better alarm effect, in addition to the alarm of buzzer B1, different fault code alarms are displayed by digital tubes in different colors. Figure 7 The alarm circuit also includes a multi-color digital tube and a driving circuit. The multi-color digital tube is connected to the output port of the driving circuit. The driving circuit includes a resistor R13, a resistor R14, a capacitor C11, a capacitor C12, a capacitor C13, a capacitor C14, a diode V4 and a driving chip N1. The model of the driving chip N1 is SM1616. One end of the resistor R13 is connected to the first DC power supply, and the other end is connected in series with the capacitor C13 and then grounded. One end of the resistor R14 is connected to the first DC power supply, and the other end is connected in series with the capacitor C14 and then grounded. The series connection between the resistor R13 and the capacitor C13 is connected to the ninth pin of the driving chip N1, and the series connection between the resistor R14 and the capacitor C14 is connected to the tenth pin of the driving chip N1. The ninth pin of the driving chip N1 is connected to the twenty-first pin of the controller, and the tenth pin is connected to the twenty-second pin of the controller. The eleventh pin of the driving chip N1 is grounded, and the twenty-fifth pin is connected in series with the capacitor C11 and then grounded. The capacitor C12 is connected in parallel at both ends of the capacitor C11, and the twenty-fifth pin is also connected to the cathode of the diode V4. The anode of the diode V4 is connected to the second DC power supply. In this embodiment, the multi-color digital tube is an LED digital tube, and other indicator lights can also be selected. When the oxygen generator is abnormally powered off, the multi-color digital tube can display lights of different colors according to different fault codes to alert the user.

[0037] Working principle: The power-off alarm circuit of the vehicle-mounted oxygen concentrator of the utility model is applied to the oxygen concentrator. When the oxygen concentrator is turned on, the automatic reset switch S1 is pressed. After the controller detects the signal, it determines that the oxygen concentrator is turned on. When the oxygen concentrator is powered on normally, the controller outputs a signal to power the back-end circuit and charges the supercapacitor. When it is detected that the oxygen concentrator is shut down normally, the controller disconnects the output signal to the transistor Q1, and the supercapacitor does not discharge to the outside. When the automatic reset switch S1 is pressed again, it is judged that the oxygen concentrator is shut down normally. The power-off in the shutdown case is a normal power-off, and the power-off in other cases is judged as an abnormal power-off. When it is detected that the oxygen concentrator is powered off abnormally, the controller continues to output a signal to the transistor Q1, and the supercapacitor discharges to the outside, that is, the alarm circuit is powered on, the buzzer sounds an alarm, and the multi-color digital tube flashes, prompting the user that the oxygen concentrator is abnormally powered off.

[0038] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A power-off alarm circuit for a vehicle-mounted oxygen concentrator, characterized in that: The invention comprises a controller, a charging and discharging circuit, a switch signal detection circuit, a power-off signal detection circuit and an alarm circuit. The switch signal detection circuit comprises a self-resetting switch S1. The output ends of the switch signal detection circuit and the power-off signal detection circuit are both electrically connected to the input end of the controller. The charging and discharging circuit comprises a plurality of supercapacitors. The output port of the controller is electrically connected to the input port of the charging and discharging circuit. The charging and discharging circuit supplies power to the alarm circuit after the oxygen concentrator is abnormally powered off.

2. The power failure alarm circuit of the vehicle-mounted oxygen concentrator according to claim 1 is characterized in that: The model of the controller is GD32C103CBT6. The power-off signal detection circuit includes a resistor R6, a resistor R8, a resistor R10, a capacitor C10 and a diode V3. One end of the resistor R6 is connected to the power supply, and the other end is connected to one end of the resistor R10. The other end of the resistor R10 is grounded. The resistor R6 and the resistor R10 are connected in series and electrically connected to one end of the resistor R8. The other end of the resistor R8 is connected in series with the capacitor C10 and then grounded. The other end of the resistor R8 is also connected to the anode of the diode V3. The cathode of the diode V3 is connected to the first DC power supply. The other end of the resistor R8 is also connected to the tenth pin of the controller.

3. The power failure alarm circuit of the vehicle-mounted oxygen concentrator according to claim 1 is characterized in that: The switch signal detection circuit also includes a resistor R7, a resistor R9, an optocoupler E1 and a capacitor C9, one end of the resistor R7 is connected to a power supply, and the other end is connected to one end of the resistor R9, the other end of the resistor R9 is connected in series with the automatic reset switch S1 and then grounded, one end of the resistor R9 is connected to the first pin of the optocoupler E1, the other end of the resistor R9 is connected to the second pin of the optocoupler E1, the capacitor C9 is connected in series between the third pin and the fourth pin of the optocoupler E1, the fourth pin is connected to the eleventh pin of the controller, the third pin is grounded, and the model of the optocoupler E1 is TPL291.

4. The power failure alarm circuit of the vehicle-mounted oxygen concentrator according to claim 1 is characterized in that: The multiple supercapacitors include supercapacitors CE1, CE2, CE3 and CE4. The charging and discharging circuit also includes capacitor C6, voltage regulator chip U3, diode V2, inductor L1, resistor R2, resistor R4, resistor R1, diode V1, relay K1, resistor R3, resistor R5, transistor Q1, voltage regulator chip U2, voltage regulator chip U1, capacitor C1 and capacitor C2. The model of voltage regulator chip U3 is LM2576, the model of voltage regulator chip U2 is SPX1117M3-L-5, and the model of voltage regulator chip U1 is SPX 1117M3-L-3-3, the model of relay K1 is G6K-2P-Y, one end of capacitor C6 is connected to the power supply, and the other end is grounded, the first pin of voltage regulator chip U3 is connected to the power supply, the third pin and the fifth pin are grounded, the second pin is connected to the cathode of diode V2, the anode of diode V2 is grounded, the second pin is also connected in series with inductor L1 and then connected to one end of resistor R1, the other end of resistor R1 is connected to the anode of diode V1, the cathode of diode V1 is connected in series with super capacitors CE2, CE1, CE3, CE4 in sequence and then grounded , one end of the resistor R1 is connected in series with the resistor R2 and the resistor R4 in sequence and then grounded, one end of the resistor R1 is connected in series with the capacitor C5 and then grounded, the connection point between the resistor R2 and the resistor R4 is electrically connected to the fourth pin of the voltage regulator chip U3, the cathode of the diode V1 is connected to one end of the normally open contact of the relay K1, the other end of the normally open contact of the relay K1 is connected to the third pin of the voltage regulator chip U2, the connection point between the second pin of the voltage regulator chip U2 and the third pin of the voltage regulator chip U1 is electrically connected to the second DC power supply, and the second pin of the voltage regulator chip U1 is connected to the first DC power supply, A capacitor C1 is connected in series between the first pin and the second pin of the voltage stabilizing chip U2, a capacitor C2 is connected in series between the first pin and the second pin of the voltage stabilizing chip U1, the first pin of the voltage stabilizing chip U2 is electrically connected to the first pin of the voltage stabilizing chip U1, one end of the coil of the relay K1 is connected to the second DC power supply, and the other end is connected to the collector of the transistor Q1, the base of the transistor Q1 is connected to one end of the resistor R3, the emitter of the transistor Q1 is grounded, one end of the resistor R3 is connected in series with the resistor R5 and then grounded, and one end of the resistor R3 is also connected to the fourth pin of the controller.

5. The power failure alarm circuit of the vehicle-mounted oxygen concentrator according to claim 1 is characterized in that: The alarm circuit includes a buzzer B1 and a control circuit, the control circuit includes a resistor R11, a resistor R12 and a transistor Q2, one end of the resistor R11 is connected to the twelfth pin of the controller, and the other end is connected to the base of the transistor Q2, the emitter of the transistor Q2 is connected to the second DC power supply, the collector of the transistor Q2 is connected to the positive electrode of the buzzer B1, and the negative electrode of the buzzer B1 is connected in series with the resistor R12 and then grounded.

6. The power failure alarm circuit of the vehicle-mounted oxygen concentrator according to claim 5 is characterized in that: The alarm circuit also includes a multi-color digital tube and a drive circuit. The multi-color digital tube is connected to the output port of the drive circuit. The drive circuit includes a resistor R13, a resistor R14, a capacitor C11, a capacitor C12, a capacitor C13, a capacitor C14, a diode V4 and a drive chip N1. The model of the drive chip N1 is SM1616. One end of the resistor R13 is connected to the first DC power supply, and the other end is connected in series with the capacitor C13 and then grounded. One end of the resistor R14 is connected to the first DC power supply, and the other end is connected in series with the capacitor C14 and then grounded. The series connection between the resistor R13 and the capacitor C13 is connected to the ninth pin of the drive chip N1, and the series connection between the resistor R14 and the capacitor C14 is connected to the tenth pin of the drive chip N1. The ninth pin of the drive chip N1 is connected to the twenty-first pin of the controller, and the tenth pin is connected to the twenty-second pin of the controller. The eleventh pin of the drive chip N1 is grounded, and the twenty-fifth pin is connected in series with the capacitor C11 and then grounded. The capacitor C12 is connected in parallel to both ends of the capacitor C11, and the twenty-fifth pin is also connected to the cathode of the diode V4. The anode of the diode V4 is connected to the second DC power supply.

7. The power failure alarm circuit of the vehicle-mounted oxygen concentrator according to claim 2, 3 or 4, characterized in that: The power supply provides a 24V DC voltage.

8. The power failure alarm circuit of the vehicle-mounted oxygen concentrator according to claim 2, 4 or 6, characterized in that: The first DC power supply provides a DC voltage of 3.3V.

9. The power failure alarm circuit of the vehicle-mounted oxygen concentrator according to claim 4 or 6, characterized in that: The second DC power supply provides a DC voltage of 5V.

10. The power failure alarm circuit of the vehicle-mounted oxygen concentrator according to claim 6 is characterized in that: The buzzer B1 is a conventional buzzer or speaker, and the multi-color digital tube is an LED digital tube.

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