A control system and oxygen generator

Abstract

The application relates to a control system and an oxygen generator, and relates to the technical field of electronics. The control system comprises a first control circuit, a fan monitoring circuit and an oxygen production control circuit. The output end of the fan monitoring circuit is electrically connected with the first input end of the first control circuit. The detection end of the fan monitoring circuit is used for electrically connecting with a fan in the oxygen generator. The fan monitoring circuit is used for detecting the working state of the fan, generating a first detection signal and sending the first detection signal to the first control circuit. The output end of the first control circuit is electrically connected with the input end of the oxygen production control circuit. The first control circuit is used for receiving the first detection signal, sending a first control signal to the oxygen production control circuit when the first detection signal represents an abnormal state of the fan, so that the oxygen production control circuit controls the oxygen generator to stop producing oxygen and / or discharges oxygen in the oxygen generator to the outside in response to the first control signal. The oxygen-rich environment is avoided, and the reliability and safety of the oxygen generator are improved.

Description

Technical Field

[0001] This application relates to the field of electronic technology, and more particularly to a control system and an oxygen generator. Background Technology

[0002] Existing oxygen concentrators mainly utilize molecular sieve adsorption and desorption technology to produce oxygen at a certain concentration. Molecular sieve oxygen concentrators use a compressor as power and molecular sieves as the adsorption medium. Through the cooperation of components such as solenoid valves, oxygen and nitrogen in the air are separated to produce high-concentration oxygen. The oxygen is then delivered to the oxygen outlet of the oxygen concentrator through pipelines, ultimately allowing users to breathe high-concentration oxygen.

[0003] Existing molecular sieve oxygen generators have numerous internal piping interfaces, which can easily lead to undetected oxygen leaks due to pipe aging or loose connections. The accumulated leaked oxygen can create an oxygen-rich environment inside the generator, increasing the risk of fire and posing a safety hazard. Utility Model Content

[0004] This application provides a control system and an oxygen generator to solve the problem that an oxygen generator may create an oxygen-rich environment due to oxygen leakage, thereby increasing the risk of fire.

[0005] In a first aspect, embodiments of this application provide a control system for an oxygen concentrator, the control system comprising: a first control circuit, a fan monitoring circuit, and an oxygen production control circuit;

[0006] The output terminal of the fan monitoring circuit is electrically connected to the first input terminal of the first control circuit. The detection terminal of the fan monitoring circuit is used to electrically connect to the fan inside the oxygen concentrator. The fan monitoring circuit is used to detect the working status of the fan and generate a first detection signal, and to send the first detection signal to the first control circuit.

[0007] The output terminal of the first control circuit is electrically connected to the input terminal of the oxygen generation control circuit. The first control circuit is used to receive the first detection signal and send a first control signal to the oxygen generation control circuit when the first detection signal indicates that the fan is in an abnormal state, so that the oxygen generation control circuit responds to the first control signal to control the oxygen generator to stop generating oxygen, and / or release the oxygen inside the oxygen generator to the outside.

[0008] Optionally, the fan monitoring circuit includes a sampling module and an amplification module;

[0009] The output terminal of the sampling module is electrically connected to the input terminal of the amplification module, the detection terminal of the sampling module is used to electrically connect to the fan, the sampling module is used to detect the working status of the fan and acquire the sampling signal, and send the sampling signal to the amplification module;

[0010] The output terminal of the amplification module is electrically connected to the first input terminal of the first control circuit. The amplification module is used to amplify the sampled signal, generate the first detection signal, and send the first detection signal to the first control circuit.

[0011] Optionally, the sampling module includes:

[0012] A sampling resistor is provided, with its first end electrically connected to the input terminal of the amplification module and its second end electrically connected to the fan. The sampling resistor is used to detect the operating current of the fan and convert it into a sampling voltage, and to send the sampling voltage as the sampling signal to the amplification module.

[0013] Optionally, the amplification module includes:

[0014] An operational amplifier is provided, wherein the non-inverting input terminal of the operational amplifier is electrically connected to the output terminal of the sampling module, and the output terminal of the operational amplifier is electrically connected to the inverting input terminal and the first input terminal of the first control circuit, respectively. The operational amplifier is used to amplify the sampling signal to obtain the first detection signal and send the first detection signal to the first control circuit.

[0015] Optionally, the oxygen generation control circuit includes:

[0016] The compressor control module has its input terminal electrically connected to the first output terminal of the first control circuit, and its output terminal electrically connected to the compressor of the oxygen concentrator. The compressor control module is used to control the compressor to stop in response to a first sub-signal sent by the first control circuit, so that the oxygen concentrator stops producing oxygen.

[0017] And / or,

[0018] The solenoid valve control module has its input terminal electrically connected to the second output terminal of the first control circuit, and its output terminal electrically connected to the solenoid valve of the oxygen concentrator. The compressor control module is used to control the solenoid valve to open in response to the second sub-signal sent by the first control circuit, so that the oxygen concentrator releases internal oxygen. The first control signal includes the first sub-signal and the second sub-signal.

[0019] Optionally, the control system further includes a first temperature detection circuit, which is used to detect the ambient temperature of the first control circuit, generate a first temperature detection signal, and send the first temperature detection signal to the first control circuit.

[0020] The second input terminal of the first control circuit is electrically connected to the output terminal of the first temperature detection circuit. The first control circuit is further configured to send a fourth control signal to the oxygen generation control circuit when the first temperature detection signal indicates that the ambient temperature of the first control circuit exceeds a first temperature threshold, so that the oxygen generation control circuit responds to the fourth control signal to control the oxygen generator to stop generating oxygen, and / or release the oxygen inside the oxygen generator to the outside.

[0021] Optionally, the control system further includes a second temperature detection circuit, which is used to detect the ambient temperature of the power supply circuit inside the oxygen generator, generate a second temperature detection signal, and send the second temperature detection signal to the first control circuit.

[0022] The third input terminal of the first control circuit is electrically connected to the output terminal of the second temperature detection circuit. The first control circuit is also used to send a fifth control signal to the oxygen generation control circuit when the second temperature detection signal indicates that the ambient temperature of the power supply circuit exceeds the second temperature threshold, so that the oxygen generation control circuit controls the oxygen generator to stop generating oxygen in response to the fifth control signal, and / or releases the oxygen inside the oxygen generator to the outside.

[0023] Optionally, the control system further includes:

[0024] A sound alarm circuit, wherein the control terminal of the sound alarm circuit is electrically connected to the first alarm output terminal of the first control circuit, and the sound alarm circuit is used to output a sound alarm signal under the control of a first alarm signal sent by the first control circuit.

[0025] And / or,

[0026] An optical alarm circuit is provided, wherein the control terminal of the optical alarm circuit is electrically connected to the second alarm output terminal of the first control circuit, and the optical alarm circuit is used to output an optical alarm signal under the control of the second alarm signal sent by the first control circuit.

[0027] Secondly, embodiments of this application provide an oxygen generator, which includes a fan and a control system as described in the first aspect, wherein the detection terminal of the fan monitoring circuit in the control system is electrically connected to the fan.

[0028] Optionally, the oxygen generator includes a first circuit board, and the first control circuit in the control system is disposed on the first circuit board;

[0029] The first temperature detection circuit in the control system includes a first temperature sensor, which is mounted on the first circuit board.

[0030] Optionally, the oxygen generator includes a power supply circuit, and the second temperature detection circuit in the control system includes a second temperature sensor, which is located at the power supply circuit.

[0031] The technical solutions provided by the embodiments of this application bring at least the following beneficial effects:

[0032] In this embodiment, the control system includes a first control circuit, a fan monitoring circuit, and an oxygen generation control circuit. The output terminal of the fan monitoring circuit is electrically connected to the first input terminal of the first control circuit. The detection terminal of the fan monitoring circuit is used to electrically connect to the fan inside the oxygen generator. The fan monitoring circuit is used to detect the working status of the fan and generate a first detection signal, and to send the first detection signal to the first control circuit. The output terminal of the first control circuit is electrically connected to the input terminal of the oxygen generation control circuit. The first control circuit is used to receive the first detection signal and, when the first detection signal indicates an abnormal fan status, to send a first control signal to the oxygen generation control circuit, so that the oxygen generation control circuit responds to the first control signal to control the oxygen generator to stop generating oxygen, and / or to release the oxygen inside the oxygen generator to the outside. In this way, the working status of the internal fan of the oxygen concentrator can be detected in real time by the fan monitoring circuit. When the first control circuit determines that the fan status is abnormal based on the first detection signal, it can send a first control signal to the oxygen concentrator control circuit in a timely manner, so that the oxygen concentrator control circuit responds to the first control signal to control the oxygen concentrator to stop oxygen production, and / or release the oxygen inside the oxygen concentrator to the outside, so as to avoid the formation of an oxygen-rich environment inside the oxygen concentrator, thus improving the reliability and safety of the oxygen concentrator.

[0033] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0034] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application, and do not constitute an undue limitation of this application.

[0035] Figure 1 This is a schematic diagram of the structure of a control system for an oxygen generator provided in an embodiment of this application;

[0036] Figure 2 This is a circuit diagram of a fan control sub-circuit provided in an embodiment of this application;

[0037] Figure 3 This is a structural block diagram of a control system provided in an embodiment of this application;

[0038] Figure 4 This is a circuit diagram of a fan detection sub-circuit provided in an embodiment of this application;

[0039] Figure 5 This is a circuit diagram of a fan monitoring circuit provided in an embodiment of this application;

[0040] Figure 6 This is a circuit diagram of a first temperature detection circuit provided in an embodiment of this application;

[0041] Figure 7 This is a circuit diagram of a second temperature detection circuit provided in an embodiment of this application;

[0042] Figure 8 This is a schematic diagram of the interface of a first control circuit provided in an embodiment of this application;

[0043] Figure 9 This is a schematic diagram of the structure of an oxygen generator provided in an embodiment of this application;

[0044] Figure 10 This is a structural block diagram of a molecular sieve oxygen generator provided in an embodiment of this application.

[0045] Figure label:

[0046] The control system 10 includes a first control circuit 101, a fan monitoring circuit 102, a sampling module 1021, an amplification module 1022, an oxygen generation control circuit 103, a compressor control module 1031, a solenoid valve control module 1032, a first temperature detection circuit 104, a first temperature sensor 1041, a second temperature detection circuit 105, a second temperature sensor 1051, an audible alarm circuit 106, and an optical alarm circuit 107.

[0047] Oxygen generator 20, fan 201, compressor 202, main board 203, solenoid valve 204, power adapter 205, adsorption tower 206, oxygen outlet 207, oxygen pipe 208. Detailed Implementation

[0048] To enable those skilled in the art to better understand the technical solutions of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0049] It should be noted that the terms "first," "second," etc., used in the specification and drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein.

[0050] Most existing molecular sieve oxygen concentrators do not consider the risks of an oxygen-enriched environment inside the machine casing, simply adding a cooling fan to the compressor. Furthermore, the fan control method mostly uses transistors or metal-oxide-semiconductor field-effect transistors (MOS) as power-on controllers, controlling the switching of the transistors or MOS via the input / output ports (I / O ports) of a microcontroller or other control circuit, thereby powering the fan and controlling its rotation. Therefore, the fan inside the oxygen concentrator operates in an open-loop control mode, which makes it difficult to promptly identify fan malfunctions. This results in poor airflow inside the oxygen concentrator, easily creating an oxygen-enriched environment, and fan cooling failure, posing a safety hazard.

[0051] Figure 1 This is a schematic diagram of the structure of a control system 10 for an oxygen generator 20 provided in an embodiment of this application, as shown below. Figure 1 As shown, the control system 10 includes: a first control circuit 101, a fan monitoring circuit 102, and an oxygen generation control circuit 103;

[0052] The output terminal of the fan monitoring circuit 102 is electrically connected to the first input terminal of the first control circuit 101. The detection terminal of the fan monitoring circuit 102 is used to electrically connect to the fan 201 inside the oxygen concentrator 20. The fan monitoring circuit 102 is used to detect the working status of the fan 201 and generate a first detection signal, and to send the first detection signal to the first control circuit 101.

[0053] The output terminal of the first control circuit 101 is electrically connected to the input terminal of the oxygen generation control circuit 103. The first control circuit 101 is used to receive the first detection signal and send the first control signal to the oxygen generation control circuit 103 when the first detection signal indicates that the fan 201 is in an abnormal state. This causes the oxygen generation control circuit 103 to control the oxygen generator 20 to stop generating oxygen in response to the first control signal, and / or to release the oxygen inside the oxygen generator 20 to the outside.

[0054] In some embodiments, the control system 10 can be applied to the molecular sieve oxygen generator 20, or it can also be applied to oxygen generators using other oxygen generation principles such as membrane separation oxygen generation or chemical oxygen generation. This application does not limit this application. The control system 10 can detect the operating status of the fan 201 inside the oxygen generator 20, and promptly control the compressor 202 of the oxygen generator 20 to stop when the fan 201 is abnormal, thus stopping oxygen generation. It can also release residual oxygen in the internal pipelines of the oxygen generator 20, preventing the formation of an oxygen-rich environment inside the oxygen generator 20. Therefore, it can improve the reliability and safety of the oxygen generator 20.

[0055] In some embodiments, the first control circuit 101 may be a core control module such as a microcontroller unit (MCU) on the mainboard 203 of the oxygen concentrator 20. For example, an MCU is a microcomputer system that integrates core components such as a central processing unit (CPU), memory, timers, and I / O ports onto a single chip. In this embodiment, the MCU can be electrically connected to the fan monitoring circuit 102 and the oxygen generation control circuit 103 of the control system 10 through different interfaces to output control signals or receive detection signals. This is merely an example, and the embodiments of this application are not limited thereto.

[0056] In some embodiments, the fan monitoring circuit 102 is used to control the operation of the fan 201 inside the oxygen concentrator 20 and detect the operating status of the fan 201. Specifically, the fan monitoring circuit 102 may include a fan control sub-circuit and a fan detection sub-circuit. The input terminal of the fan control sub-circuit is electrically connected to the output terminal of the first control circuit 101, and the output terminal of the fan control sub-circuit is electrically connected to the input terminal of the fan 201. The fan control sub-circuit can receive control signals sent by the first control circuit 101 and provide power voltage to the fan 201 in response to the control signals, thereby powering the fan 201 and causing the fan 201 to rotate.

[0057] Figure 2 This is a circuit diagram of a fan control sub-circuit provided in an embodiment of this application, as shown below. Figure 2 As shown, the fan control sub-circuit mainly consists of a Darlington array U9 and a MOSFET Q5. MOSFET Q5 serves as the power control switch for fan 201, providing a +12V DC operating voltage to fan 201. The Darlington array U9 is a Darlington transistor array chip, which integrates multiple (typically 4, 7, or 8) independent Darlington transistor pairs onto the same silicon chip and packages them into a single chip. It has independent channels, each with its own input and output pins.

[0058] like Figure 2 As shown, input pin 5B of the Darlington array chip U9 can be electrically connected to an I / O port of the first control circuit 101 to receive the DC FAN control signal sent by the first control circuit 101. Input pin 5C of the Darlington array chip U9 can be electrically connected to the gate (g) of the MOSFET Q5 through resistor R24. The DC FAN control signal can be a high-level signal that controls the operation of the Darlington array chip U9. Figure 2The MOSFET Q5 in the circuit is a PMOS transistor. The source (s) of PMOS transistor Q5 is electrically connected to a +12V DC power source, and the drain (d) of PMOS transistor Q5 is electrically connected to interface 1 of fan 201 (P7) via resistor FB16. Furthermore, resistor R20 is electrically connected between the source (s) and gate (g) of PMOS transistor Q5. The E interface of Darlington array chip U9 is grounded, and the COM interface is also electrically connected to capacitor C60. The two ends of capacitor C60 are electrically connected to the +12V DC power source and ground (GND), respectively.

[0059] In some embodiments, the output terminal of the fan detection sub-circuit is electrically connected to the first input terminal of the first control circuit 101, and the detection terminal of the fan detection sub-circuit is electrically connected to the fan 201. The fan detection sub-circuit is used to detect the operating state of the fan 201 and generate a first detection signal, and to send the first detection signal to the first control circuit 101. Specifically, the fan detection sub-circuit can determine the operating state of the fan 201 by detecting state parameters such as the operating current and operating voltage of the fan 201, and generate a first detection signal based on the actual operating current or operating voltage, sending it to the first control circuit 101 so that the first control circuit 101 can determine whether the operating state of the fan 201 is abnormal based on the first detection signal.

[0060] Optionally, such as Figure 3 As shown, the fan monitoring circuit 102 includes a sampling module 1021 and an amplification module 1022;

[0061] The output terminal of the sampling module 1021 is electrically connected to the input terminal of the amplification module 1022. The detection terminal of the sampling module 1021 is used to electrically connect to the fan 201. The sampling module 1021 is used to detect the working status of the fan 201 and acquire the sampling signal, as well as send the sampling signal to the amplification module 1022.

[0062] The output terminal of the amplification module 1022 is electrically connected to the first input terminal of the first control circuit 101. The amplification module 1022 is used to amplify the sampled signal, generate a first detection signal, and send the first detection signal to the first control circuit 101.

[0063] In some embodiments, the first input terminal of the first control circuit 101 has a fixed input voltage range. The sampling signal obtained by the sampling module 1021 in detecting the working state of the fan 201 needs to be amplified by the amplification module 1022 so that the signal voltage of the obtained first detection signal meets the input voltage range of the first input terminal, which enables the first control circuit 101 to correctly receive the first detection signal through the first input terminal.

[0064] For example, if the first input terminal of the first control circuit 101 is an AD acquisition pin of the main MCU of the oxygen generator 20, then the input voltage range of the AD acquisition pin depends on the reference voltage configuration of its analog-to-digital converter (ADC), the power supply design, and the electrical characteristics of the MCU chip itself, such as the input voltage range of 0 volts (V) to 3.3V.

[0065] In some embodiments, the detection terminal of the sampling module 1021 is electrically connected to the fan 201. The sampling module 1021 can sample the operating current, operating voltage, and other status parameters of the fan 201 to obtain a sampling signal. The sampling signal can be a voltage signal. After being amplified by the amplification module 1022, the sampling signal is output to obtain the first detection signal.

[0066] Optionally, the sampling module 1021 includes:

[0067] The sampling resistor has its first end electrically connected to the input terminal of the amplifier module 1022, and its second end electrically connected to the fan 201. The sampling resistor is used to detect the operating current of the fan 201 and convert it into a sampling voltage, and to send the sampling voltage as a sampling signal to the amplifier module 1022.

[0068] In some embodiments, the sampling module 1021 includes one or more sampling resistors, which can be connected in series or parallel. This application does not limit this. In this embodiment, the first and second ends of the sampling resistor can be the same end or different ends. This application does not limit this. For example, when the sampling module 1021 includes a single sampling resistor, one end of the sampling resistor is electrically connected to the input terminals of the fan 201 and the amplifier module 1022, respectively, and the other end is grounded.

[0069] In this embodiment, the operating current of the fan 201 can be detected by the sampling resistor. The operating current flowing through the sampling resistor can generate a sampling voltage, thereby conveniently converting the operating current of the fan 201 into a sampling voltage and sending the sampling voltage as a sampling signal to the amplification module 1022 to realize real-time detection of the operating status of the fan 201. When the operating current of the fan 201 is abnormal, the fault status of the fan 201 can be identified in time, reducing safety hazards.

[0070] Optionally, the amplification module 1022 includes:

[0071] An operational amplifier is provided, with its non-inverting input terminal electrically connected to the output terminal of the sampling module 1021, and its output terminal electrically connected to both the inverting input terminal and the first input terminal of the first control circuit 101. The operational amplifier is used to amplify the sampled signal to obtain a first detection signal and send the first detection signal to the first control circuit 101.

[0072] In some embodiments, the amplification module 1022 includes a non-inverting amplifier circuit composed of operational amplifiers. Specifically, the non-inverting input terminal of the operational amplifier is electrically connected to the output terminal of the sampling module 1021, and the output terminal of the operational amplifier is electrically connected to its own inverting input terminal and the first input terminal of the first control circuit 101, thus forming a non-inverting amplifier circuit. The input terminal of the operational amplifier receives the sampling signal, amplifies the signal voltage of the sampling signal, and then outputs a first detection signal to the first input terminal of the first control circuit 101 through its output terminal, so that the first control circuit 101 can correctly receive the first detection signal through the first input terminal.

[0073] The amplification ratio of the operational amplifier can be determined based on the voltage range of the sampled voltage and the input voltage range of the first input terminal. The voltage range of the sampled voltage is related to the operating current range of the fan 201 and the resistance value of the sampling resistor. The input voltage range of the first input terminal is determined by the circuit characteristics of the first control circuit 101. In practical applications, the amplification ratio of the operational amplifier can be flexibly adjusted according to the voltage range of the sampled voltage and the input voltage range of the first input terminal. This embodiment does not impose any limitations on this.

[0074] For example, the amplification ratio of the non-inverting operational amplifier circuit is determined by the ratio of the feedback resistor to the grounding resistor, where the feedback resistor is connected between the output terminal and the inverting input terminal of the operational amplifier, and the grounding resistor is connected between the inverting input terminal and the ground terminal of the operational amplifier.

[0075] Figure 4 This is a circuit diagram of a fan detection sub-circuit provided in an embodiment of this application, as shown below. Figure 4 As shown, the sampling module 1021 in the fan detection sub-circuit includes a sampling resistor R73, and the amplification module 1022 includes a non-inverting amplifier circuit composed of an operational amplifier U11. Figure 4As shown, one end of the sampling resistor R73 is electrically connected to interface 2 of fan 201 (P7) via resistor FB17, and to the non-inverting input (+) of operational amplifier U11 via resistor R72. The other end of the sampling resistor R73 is also electrically connected to the inverting input (-) of operational amplifier U11 via resistor R74. Furthermore, both ends of the sampling resistor R73 are electrically connected to ground GND. The sampling resistor R73 can be a 0.15Ω 1 / 2W resistor, where 0.15 ohms (Ω) is the resistance value of the sampling resistor R73, and 1 / 2W is the rated power of the sampling resistor R73.

[0076] like Figure 4 As shown, a feedback resistor R75 is connected between the output terminal and the inverting input terminal (-) of operational amplifier U11. The output terminal of operational amplifier U11 is also electrically connected to the first input terminal of the first control circuit 101 through resistor R76. Figure 2 The first input terminal is SP / AD. Additionally, a capacitor C72 is connected between resistor R76 and the first input terminal SP / AD, and capacitor C72 acts as a filter. Operational amplifier U11 is powered by a +3.3V power supply, and the +3.3V power supply terminal is also electrically connected to ground by capacitor C73. The non-inverting input terminal (+) of operational amplifier U11 is also electrically connected to ground by capacitor C7 and diode D17. Capacitors C7 and C73 provide high-frequency filtering and anti-interference, while diode D17 provides voltage clamping protection. Since the anode of diode D17 is grounded and the cathode is connected to the non-inverting input terminal, diode D17 also provides protection against negative voltage.

[0077] Figure 5 This is a circuit diagram of a fan monitoring circuit 102 provided in an embodiment of this application, as shown below. Figure 5 As shown, the fan monitoring circuit 102 includes the following: Figure 2 and Figure 4 The circuit structure is shown. Interface 1 of fan 201 (P7) is electrically connected. Figure 2 The Darlington array chip U9 and PMOS transistor Q5 are electrically connected to interface 2 of fan 201 (P7). Figure 4 The sampling resistor R73 and operational amplifier U11 are included.

[0078] In some embodiments, the first control circuit 101 determines the working state of the fan 201 based on the first detection signal, generates a first control signal when the fan 201 is in an abnormal state, and sends the first control signal to the oxygen generation control circuit 103, so that the oxygen generation control circuit 103 controls the oxygen generator 20 to stop generating oxygen in response to the first control signal, and / or releases the oxygen inside the oxygen generator 20 to the outside.

[0079] In some embodiments, the oxygen concentrator 20 includes a compressor 202. By controlling the compressor 202 to stop, the oxygen concentrator 20 can stop producing oxygen, thus preventing the generation of new oxygen and increasing the oxygen concentration inside the oxygen concentrator 20. Furthermore, the oxygen concentrator 20 includes a solenoid valve 204, which is located upstream of the oxygen outlet 207. By driving the solenoid valve 204 to open, oxygen inside the oxygen concentrator 20 can be released through the oxygen outlet 207 to the outside of the oxygen concentrator 20 casing, thereby reducing the oxygen concentration inside the oxygen concentrator 20.

[0080] Optionally, such as Figure 3 As shown, the oxygen generation control circuit 103 includes:

[0081] The compressor control module 1031 has its input terminal electrically connected to the first output terminal of the first control circuit 101, and its output terminal electrically connected to the compressor 202 of the oxygen concentrator 20. The compressor control module 1031 is used to control the compressor 202 to stop in response to the first sub-signal sent by the first control circuit 101, so that the oxygen concentrator 20 stops producing oxygen.

[0082] And / or,

[0083] The input terminal of the solenoid valve control module 1032 is electrically connected to the second output terminal of the first control circuit 101. The output terminal of the solenoid valve control module 1032 is used to electrically connect to the solenoid valve 204 of the oxygen concentrator 20. The compressor control module 1031 is used to control the solenoid valve 204 to open in response to the second sub-signal sent by the first control circuit 101, so that the oxygen concentrator 20 releases the oxygen inside. The first control signal includes a first sub-signal and a second sub-signal.

[0084] In some embodiments, the first control circuit 101 further controls the start / stop of the compressor 202 of the oxygen concentrator 20 via the compressor control module 1031. When the first control circuit 101 determines that the fan 201 is in an abnormal state, it can send a first sub-signal to the compressor control module 1031, causing the compressor control module 1031 to control the compressor 202 to stop under the control of the first sub-signal, thereby stopping the oxygen concentrator 20 from producing oxygen.

[0085] The first output terminal of the first control circuit 101 can be an I / O port of the main MCU of the oxygen concentrator 20. The compressor control module 1031 includes transistors and relays. The transistors are, for example, bipolar transistors or MOSFETs. The main MCU can send a first sub-signal to the transistor to drive it to turn off, thereby controlling the relay to disconnect the high-voltage main power supply to the motor of the compressor 202, thus stopping the compressor 202. This is only an example and the embodiments of this application are not limited thereto.

[0086] In some embodiments, the first control circuit 101 further controls the opening / closing of the solenoid valve 204 of the oxygen concentrator 20 via the solenoid valve control module 1032. When the first control circuit 101 determines that the fan 201 is in an abnormal state, it can send a second sub-signal to the solenoid valve control module 1032, causing the solenoid valve control module 1032 to control the solenoid valve 204 to open under the control of the second sub-signal, thereby releasing oxygen from inside the oxygen concentrator 20 to the outside.

[0087] The second output terminal of the first control circuit 101 can be another I / O port of the main MCU of the oxygen concentrator 20. The solenoid valve control module 1032 includes a transistor, such as a triode or a MOSFET. The main MCU can send a second sub-signal to the solenoid valve control module 1032 to drive the transistor in the solenoid valve control module 1032 to turn on, thereby controlling the solenoid valve 204 to open, allowing oxygen inside the oxygen concentrator 20 to be released to the outside. This is only an example and the embodiments of this application are not limited thereto.

[0088] For example, in the case of a pulse oxygen concentrator 20, the solenoid valve 204 in this embodiment can be an oxygen outlet valve integrated on the oxygen tank inside the oxygen concentrator 20. After the oxygen concentrator 20 stops producing oxygen, the oxygen outlet valve can be opened to release oxygen outside the machine casing. The oxygen outlet valve is different from the pressure relief valve; the pressure relief valve is located downstream of the oxygen outlet valve and is installed in the pipeline between the oxygen outlet valve and the oxygen outlet 207. In contrast, in the case of a continuous oxygen supply oxygen concentrator 20, the solenoid valve 204 in this embodiment can be a flow regulating valve inside the oxygen concentrator 20, which can be controlled to open to the maximum flow rate, thereby quickly releasing oxygen from the pipeline.

[0089] In this embodiment of the application, when the first control circuit 101 determines that the fan 201 is in an abnormal state, it can control the compressor 202 to stop through the compressor control module 1031 in the oxygen generation control circuit 103, so that the oxygen generator 20 stops generating oxygen, and / or, control the solenoid valve 204 to open through the solenoid valve control module 1032 in the oxygen generation control circuit 103, so as to release the oxygen inside the oxygen generator 20 to the outside, thereby avoiding the formation of an oxygen-rich environment inside the oxygen generator 20, which can improve the reliability and safety of the oxygen generator 20.

[0090] In this embodiment, the control system 10 includes a first control circuit 101, a fan monitoring circuit 102, and an oxygen generation control circuit 103. The output terminal of the fan monitoring circuit 102 is electrically connected to the first input terminal of the first control circuit 101. The detection terminal of the fan monitoring circuit 102 is electrically connected to the fan 201 inside the oxygen generator 20. The fan monitoring circuit 102 is used to detect the working state of the fan 201 and generate a first detection signal, and to send the first detection signal to the first control circuit 101. The output terminal of the first control circuit 101 is electrically connected to the input terminal of the oxygen generation control circuit 103. The first control circuit 101 is used to receive the first detection signal and, when the first detection signal indicates that the fan 201 is in an abnormal state, to send a first control signal to the oxygen generation control circuit 103, so that the oxygen generation control circuit 103 responds to the first control signal to control the oxygen generator 20 to stop generating oxygen, and / or to release the oxygen inside the oxygen generator 20 to the outside. In this way, the working status of the fan 201 inside the oxygen concentrator 20 can be detected in real time by the fan monitoring circuit 102. When the first control circuit 101 determines that the fan 201 is in an abnormal state based on the first detection signal, it can send a first control signal to the oxygen concentrator control circuit 103 in a timely manner, so that the oxygen concentrator control circuit 103 responds to the first control signal to control the oxygen concentrator 20 to stop oxygen production, and / or release the oxygen inside the oxygen concentrator 20 to the outside, so as to avoid the formation of an oxygen-rich environment inside the oxygen concentrator 20, thereby improving the reliability and safety of the oxygen concentrator 20.

[0091] In related technologies, abnormal heating may occur in the internal electrical components of the oxygen concentrator 20, leading to increased temperatures at corresponding locations and potentially posing risks of sparking or ignition in severe cases. If the internal fan 201 of the oxygen concentrator 20 malfunctions, its cooling function will fail, preventing it from achieving its intended cooling purpose. Furthermore, the malfunctioning fan 201 reduces internal airflow, easily creating an oxygen-rich environment. When the area near the electrical components overheats, this increases the risk of fire in the oxygen concentrator 20, posing a safety hazard.

[0092] Optionally, such as Figure 3 As shown, the control system 10 also includes a first temperature detection circuit 104, which is used to detect the ambient temperature of the first control circuit 101, generate a first temperature detection signal, and send the first temperature detection signal to the first control circuit 101.

[0093] The second input terminal of the first control circuit 101 is electrically connected to the output terminal of the first temperature detection circuit 104. The first control circuit 101 is also used to send a fourth control signal to the oxygen generation control circuit 103 when the first temperature detection signal indicates that the ambient temperature of the first control circuit 101 exceeds the first temperature threshold, so that the oxygen generation control circuit 103 controls the oxygen generator 20 to stop generating oxygen in response to the fourth control signal, and / or releases the oxygen inside the oxygen generator 20 to the outside.

[0094] In some embodiments, the first control circuit 101 may be the core control module of the oxygen concentrator 20. If the first control circuit 101 experiences issues such as overheating, short circuits, or poor soldering, the ambient temperature at the location of the first control circuit 101 may rise, potentially posing a fire risk and causing control malfunction, resulting in the oxygen concentrator 20 failing to operate normally. In this embodiment, the first temperature detection circuit 104 can detect the ambient temperature of the first control circuit 101, quickly identifying abnormal temperatures near the first control circuit 101. This allows for timely response and the implementation of safety measures such as cooling, reducing the fire risk and improving the reliability and safety of the oxygen concentrator 20.

[0095] In some embodiments, the second input terminal of the first control circuit 101 is electrically connected to the output terminal of the first temperature detection circuit 104. The second input terminal of the first control circuit 101 can be an AD acquisition pin (Temper1) of the main MCU of the oxygen concentrator 20, and the output terminal of the first temperature detection circuit 104 is electrically connected to the AD acquisition pin Temper1. The first temperature detection circuit 104 detects the ambient temperature of the first control circuit 101, generates a first temperature detection signal, and sends the first temperature detection signal to the first control circuit 101.

[0096] The first temperature detection signal can be a voltage signal, that is, the first temperature detection circuit 104 converts the temperature value into a voltage value and sends the voltage value to the first control circuit 101, so that the first control circuit 101 can determine whether the ambient temperature of the first control circuit 101 exceeds the preset first temperature threshold based on the signal voltage of the first temperature detection signal.

[0097] In some embodiments, the first temperature threshold can be obtained by adding an additional temperature value to the operating temperature inside the housing of the oxygen concentrator 20 during normal operation (the operating temperature of different oxygen concentrators may vary to some extent). For example, if the operating temperature of the oxygen concentrator 20 during normal operation is 50 degrees Celsius (°C), and the additional temperature value is preset to 15°C, then the first temperature threshold is 65°C. Therefore, when the signal voltage of the first temperature detection signal received by the first control circuit 101, representing a temperature value exceeding 65°C, it can be determined that there is an abnormal temperature in the environment of the first control circuit 101.

[0098] Then, the first control circuit 101 can take safety measures, such as sending a fourth control signal to the oxygen generation control circuit 103, causing the oxygen generation control circuit 103 to control the oxygen generator 20 to stop generating oxygen in response to the fourth control signal, and / or releasing the oxygen inside the oxygen generator 20 to the outside, thereby preventing the formation of an oxygen-rich environment inside the oxygen generator 20 and reducing the risk of fire. The oxygen generation control circuit 103 can be referred to the relevant description in the foregoing embodiments, and will not be repeated here.

[0099] Figure 6 This is a circuit diagram of a first temperature detection circuit 104 provided in an embodiment of this application, as shown below. Figure 6 As shown, the first temperature detection circuit 104 may include a first temperature sensor 1041 (P8). Interface 1 of the first temperature sensor 1041 (P8) is electrically connected to the VCC1 power supply via resistor R61, and interface 2 of the first temperature sensor 1041 (P8) is grounded (GND). Figure 6 As shown, a resistor R60 and a capacitor C35 are also connected between interface 1 and interface 2, so resistors R61 and R60 are voltage divider resistors. The first temperature sensor 1041 (P8) converts the temperature value into a voltage value, which is then filtered by the voltage divider resistor and capacitor C35 and output to the second input terminal of the first control circuit 101. The second input terminal can be an AD acquisition pin Temper1 of the main MCU of the oxygen concentrator 20.

[0100] The first temperature sensor, 1041 (P8), can be a 10 kΩ NTC temperature sensor, where NTC stands for Negative Temperature Coefficient. An NTC temperature sensor is essentially a thermistor, whose resistance decreases significantly with increasing temperature. Furthermore, Figure 6 The resistance of resistor R60 can be 10KΩ, and the resistance of resistor R61 can be 5.1KΩ.

[0101] Optionally, such as Figure 3 As shown, the control system 10 also includes a second temperature detection circuit 105, which is used to detect the ambient temperature of the power supply circuit inside the oxygen generator 20, generate a second temperature detection signal, and send the second temperature detection signal to the first control circuit 101.

[0102] The third input terminal of the first control circuit 101 is electrically connected to the output terminal of the second temperature detection circuit 105. The first control circuit 101 is also used to send a fifth control signal to the oxygen generation control circuit 103 when the second temperature detection signal indicates that the ambient temperature of the power supply circuit exceeds the second temperature threshold, so that the oxygen generation control circuit 103 controls the oxygen generator 20 to stop generating oxygen in response to the fifth control signal, and / or releases the oxygen inside the oxygen generator 20 to the outside.

[0103] In some embodiments, the power supply circuit inside the oxygen concentrator 20 includes high-power heating devices. When the temperature of these devices in the power supply circuit becomes too high, it increases the risk of fire. For example, the power adapter 205 of the oxygen concentrator 20 converts the AC power from the mains supply to the DC voltage used by the oxygen concentrator 20 system. This area is where the high-power heating devices in the oxygen concentrator system are mainly located. If the power adapter 205 malfunctions, it is prone to overheating, leading to abnormal power supply to the oxygen concentrator 20. In this embodiment, the second temperature detection circuit 105 can detect the ambient temperature of the power supply circuit, quickly identifying abnormal temperatures near the power supply circuit. This allows for timely response and the implementation of safety measures such as cooling, reducing the risk of fire and improving the reliability and safety of the oxygen concentrator 20.

[0104] In some embodiments, the third input terminal of the first control circuit 101 is electrically connected to the output terminal of the second temperature detection circuit 105. The third input terminal of the first control circuit 101 can be an AD acquisition pin (Temper2) of the main MCU of the oxygen concentrator 20, and the output terminal of the second temperature detection circuit 105 is electrically connected to the AD acquisition pin Temper2. The second temperature detection circuit 105 detects the ambient temperature of the power supply circuit, generates a second temperature detection signal, and sends the second temperature detection signal to the first control circuit 101.

[0105] The second temperature detection signal can be a voltage signal, that is, the second temperature detection circuit 105 converts the temperature value into a voltage value and sends the voltage value to the first control circuit 101, so that the first control circuit 101 can determine whether the ambient temperature of the first control circuit 101 exceeds the preset second temperature threshold based on the signal voltage of the second temperature detection signal.

[0106] In some embodiments, the second temperature threshold can be obtained by adding a certain amount of additional temperature value to the operating temperature inside the housing of the oxygen concentrator 20 during normal operation. For example, if the operating temperature of the oxygen concentrator 20 during normal operation is 50 degrees Celsius (°C) and the additional temperature value is preset to 15°C, then the second temperature threshold is 65°C. Therefore, when the signal voltage of the second temperature detection signal received by the first control circuit 101, representing a temperature value exceeding 65°C, it can be determined that there is an abnormal temperature in the ambient temperature of the power supply circuit.

[0107] Then, the first control circuit 101 can take safety measures, such as sending a fifth control signal to the oxygen generation control circuit 103, causing the oxygen generation control circuit 103 to control the oxygen generator 20 to stop producing oxygen in response to the fifth control signal, and / or releasing the oxygen inside the oxygen generator 20 to the outside, thereby preventing the formation of an oxygen-rich environment inside the oxygen generator 20 and reducing the risk of fire. The oxygen generation control circuit 103 can be referred to the relevant description in the foregoing embodiments, and will not be repeated here.

[0108] Figure 7 This is a circuit diagram of a second temperature detection circuit 105 provided in an embodiment of this application, as shown below. Figure 7 As shown, the second temperature detection circuit 105 may include a second temperature sensor 1051 (RT1). The first terminal of the second temperature sensor 1051 (RT1) is electrically connected to the VCC1 power supply through a resistor R66, and the second terminal of the second temperature sensor 1051 (RT1) is grounded (GND). Figure 7 As shown, the second temperature sensor 1051 (RT1) is also connected in parallel with resistor R47 and capacitor C81, so resistors R66 and R47 are voltage divider resistors. The second temperature sensor 1051 (RT1) converts the temperature value into a voltage value, which is then filtered by the voltage divider resistors and capacitor C81 before being output to the third input terminal of the first control circuit 101. The third input terminal can be an AD acquisition pin, Temper2, of the main MCU of the oxygen concentrator 20. The second temperature sensor 1051 (RT1) can be a 50KΩ NTC temperature sensor, resistor R47 has a resistance of 51KΩ, and resistor R66 has a resistance of 24KΩ.

[0109] Figure 8 This is a schematic diagram of the interface of a first control circuit 101 provided in an embodiment of this application, as shown below. Figure 8 As shown, the first control circuit 101 in this embodiment can be the main MCU of the oxygen concentrator 20, and the main MCU includes multiple interfaces. For example, such as Figure 8 As shown, the FAN interface is an I / O port of the main MCU. The FAN interface is connected to... Figure 2 The Darlington array chip U9 in the middle fan control sub-circuit is electrically connected to input pin 5B. The SP / AD interface is an AD acquisition pin of the main MCU, referred to as the first input terminal SP / AD in this embodiment. The first input terminal SP / AD is also connected to... Figure 4 The output of operational amplifier U11 in the fan detection sub-circuit is electrically connected. Temper1 and Temper2 are the AD acquisition pins of the main MCU, respectively. In this embodiment, Temper1 is referred to as the second input terminal Temper1. The second input terminal Temper1 is connected to... Figure 6 The output terminal of the first temperature detection circuit 104 is electrically connected. In this embodiment, the Temperature2 interface is referred to as the third input terminal Temperature2, and the third input terminal Temperature2 is connected to... Figure 7 The output terminal of the second temperature detection circuit 105 is electrically connected.

[0110] Optionally, such as Figure 3 As shown, the control system 10 also includes:

[0111] The sound alarm circuit 106 is electrically connected to the first alarm output terminal of the first control circuit 101. The sound alarm circuit 106 is used to output a sound alarm signal under the control of the first alarm signal sent by the first control circuit 101.

[0112] And / or,

[0113] The optical alarm circuit 107 is electrically connected to the second alarm output terminal of the first control circuit 101. The optical alarm circuit 107 is used to output an optical alarm signal under the control of the second alarm signal sent by the first control circuit 101.

[0114] In some embodiments, the control system 10 further includes a sound alarm circuit 106, such as a speaker or buzzer. The first alarm output terminal of the first control circuit 101 can be an I / O port of the main MCU of the oxygen concentrator 20. The control terminal of the sound alarm circuit 106 is electrically connected to the I / O port of the main MCU, and can receive the first alarm signal sent by the main MCU and output a sound alarm signal in response to the first alarm signal, prompting the user to troubleshoot in time, thereby improving the reliability and safety of the oxygen concentrator 20. The sound alarm circuit 106 may include, for example, a speaker or buzzer, and the sound alarm signal includes alarm prompt voice and buzzer sounding.

[0115] In some embodiments, the control system 10 further includes an optical alarm circuit 107, such as an optical alarm device like a display screen (LED) or a flashlight. The second alarm output terminal of the first control circuit 101 can be an I / O port of the oxygen concentrator 20's main MCU. The control terminal of the optical alarm circuit 107 is electrically connected to the I / O port of the main MCU, allowing it to receive the second alarm signal sent by the main MCU and output an optical alarm signal in response to the second alarm signal, prompting the user to troubleshoot the fault promptly, thus improving the reliability and safety of the oxygen concentrator 20. The optical alarm signal includes fault information display, red flashing lights, etc.

[0116] In some embodiments, the control system 10 may include an integrated audible and visual alarm circuit, referred to in this embodiment as an audible and visual alarm circuit. The control terminal of the audible and visual alarm circuit is electrically connected to the alarm output terminal of the first control circuit 101. The audible and visual alarm circuit is used to perform audible and visual alarms under the control of the alarm control signal sent by the first control circuit 101, prompting the user to troubleshoot in time, which can improve the reliability and safety of the oxygen concentrator 20.

[0117] This application embodiment also provides an oxygen generator 20, which includes a fan 201 and a control system 10 as described in the previous embodiment. The detection terminal of the fan monitoring circuit 102 in the control system 10 is electrically connected to the fan 201.

[0118] In some embodiments, the oxygen concentrator 20 includes a fan 201, which is mounted on the noise reduction chamber of the compressor 202 inside the casing of the oxygen concentrator 20. In this embodiment, the fan 201 is under closed-loop control. Specifically, the first control circuit 101 in the control system 10 controls the start of the compressor 202 and periodically controls the operation of the solenoid valve 204 to produce high-concentration oxygen. Furthermore, by controlling the rotation of the fan 201, continuous air circulation can be maintained inside the casing of the oxygen concentrator 20, preventing the formation of an oxygen-rich environment inside. At the same time, the fan 201 can also dissipate heat from the compressor 202.

[0119] When the fan 201 malfunctions or the temperature sensor detects a temperature exceeding the preset threshold, the compressor 202 is stopped to halt oxygen production in the oxygen concentrator 20. Simultaneously, the solenoid valve 204 is activated to release oxygen from the adsorption tower 206 and pipelines of the oxygen concentrator 20. The alarm circuit is then activated to issue an alarm signal, prompting the user to troubleshoot the problem promptly. This improves the reliability and safety of the oxygen concentrator 20.

[0120] Figure 9 This is a schematic diagram of the structure of an oxygen concentrator 20 provided in an embodiment of this application, as shown below. Figure 9 As shown, the oxygen concentrator 20 includes a fan 201, a compressor 202, a main board 203, a solenoid valve 204, a power adapter 205, an adsorption tower 206, an oxygen outlet 207, an oxygen pipe 208 connected to an oxygen pipe, and a control system 10. The fan 201 is installed on the noise reduction box of the compressor 202 inside the casing of the oxygen concentrator 20. The first control circuit 101, the fan monitoring circuit 102, and the oxygen production control circuit 103 in the control system 10 can be set on the main board 203. Alternatively, the first control circuit 101, the fan monitoring circuit 102, and the oxygen production control circuit 103 can also be set on other circuit boards inside the oxygen concentrator 20. This application embodiment does not limit this.

[0121] In this system, the detection terminal of the fan monitoring circuit 102 in the control system 10 is electrically connected to the fan 201, allowing the control system 10 to detect the operating status of the fan 201 through the fan monitoring circuit 102. When the first detection signal provided by the fan monitoring circuit 102 indicates an abnormal state of the fan 201, the first control circuit 101 sends a first control signal to the oxygen generation control circuit 103. In response to the first control signal, the oxygen generation control circuit 103 controls the oxygen generator 20 to stop oxygen generation and / or releases the oxygen inside the oxygen generator 20 to the outside. This prevents the formation of an oxygen-rich environment inside the oxygen generator 20, thus improving the reliability and safety of the oxygen generator 20.

[0122] In some embodiments, the oxygen generation control circuit 103 in the control system 10 includes a compressor control module 1031, which is electrically connected to the compressor 202 inside the oxygen concentrator 20. For example, as Figure 9 As shown, the compressor control module 1031 can be mounted on the main board 203 of the oxygen concentrator 20 and electrically connected to the compressor 202 in the noise reduction box via a connecting cable. Alternatively, the compressor control module 1031 can be installed independently of the main board 203; for example, the compressor control module 1031 can be separately mounted on the outer wall, top, or adjacent equipment frame of the noise reduction box of the compressor 202. This is merely an example, and the embodiments of this application do not impose any limitations.

[0123] In some embodiments, the oxygen generation control circuit 103 in the control system 10 includes a solenoid valve control module 1032, which is electrically connected to a solenoid valve 204 inside the oxygen generator 20. For example, as Figure 9 As shown, the solenoid valve control module 1032 can be mounted on the main board 203 of the oxygen concentrator 20 and electrically connected to the solenoid valve 204 above the noise reduction box via a connecting cable. Alternatively, the solenoid valve control module 1032 can be installed independently of the main board 203. For example, the solenoid valve control module 1032 can be mounted together with the solenoid valve 204, and the solenoid valve control module 1032 can be electrically connected to the first control circuit 101 in the control system 10 on the main board 203 via a connecting cable. This is merely an example, and the embodiments of this application do not impose any limitations on this.

[0124] Optionally, the oxygen concentrator 20 includes a first circuit board, and the first control circuit 101 in the control system 10 is disposed on the first circuit board;

[0125] The first temperature detection circuit 104 in the control system 10 includes a first temperature sensor 1041, which is disposed on the first circuit board.

[0126] In some embodiments, the first circuit board of the oxygen concentrator 20 may be the main board 203 of the oxygen concentrator 20, and the first control circuit 101 in the control system 10 may be located on the main board 203. For example, the first control circuit 101 may be the main MCU of the oxygen concentrator 20, and the main MCU may be located on the main board 203.

[0127] In some embodiments, such as Figure 6 As shown, the first temperature detection circuit 104 includes a first temperature sensor 1041 (P8), which is used to detect the ambient temperature of the first control circuit 101 and convert the temperature value into a voltage value. In this embodiment, the first temperature sensor 1041 is located near the first control circuit 101, such as... Figure 9As shown, since the first control circuit 101 is mounted on the motherboard 203, the first temperature sensor 1041 is also mounted on the motherboard 203. The first temperature sensor 1041 can be fixedly connected to the motherboard 203. This fixed connection can be achieved through welding, bonding, threaded connection, snap-fit / clamp / hook connection, etc., and this embodiment does not impose any limitations on this method.

[0128] In this way, the temperature of the first circuit board can be detected in real time by the first temperature sensor 1041, thereby detecting the ambient temperature of the first control circuit 101. This allows for timely identification of abnormal temperatures near the first control circuit 101, prompting users to take safety measures and improving the reliability and safety of the oxygen concentrator 20.

[0129] Optionally, the oxygen concentrator 20 includes a power supply circuit, and the second temperature detection circuit 105 in the control system 10 includes a second temperature sensor 1051, which is located at the power supply circuit.

[0130] In some embodiments, such as Figure 7 As shown, the second temperature detection circuit 105 includes a second temperature sensor 1051 (RT1), which is used to detect the ambient temperature of the internal power supply circuit of the oxygen concentrator 20 and convert the temperature value into a voltage value.

[0131] In some embodiments, such as Figure 9 As shown, the second temperature sensor 1051 is located near the power supply circuit. For example, if the power supply circuit is the power adapter 205 of the oxygen concentrator 20, then the second temperature sensor 1051 can be located on the power adapter 205. Alternatively, if the power supply circuit is located on the second circuit board, which is the power board of the oxygen concentrator 20, then the second temperature sensor 1051 can be located on the second circuit board. The second temperature sensor 1051 can be fixedly connected to the second circuit board. This fixed connection can be achieved through welding, bonding, threaded connection, snap-fit / clamp / hook connection, etc., and this embodiment does not impose any limitations on this method.

[0132] In this way, the temperature of the second circuit board can be detected in real time by the second temperature sensor 1051, thereby detecting the ambient temperature of the power supply circuit, promptly identifying abnormal temperature conditions near the power supply circuit, and reminding the user to take safety measures, which can improve the reliability and safety of the oxygen concentrator 20.

[0133] Figure 10 This is a structural block diagram of a molecular sieve oxygen generator 20 provided in an embodiment of this application, as shown below. Figure 10As shown, the molecular sieve oxygen generator 20 includes a fan 201, a compressor 202, a main board 203, a solenoid valve 204, a power adapter 205, an adsorption tower 206, and an oxygen outlet 207. Furthermore, the molecular sieve oxygen generator 20 also includes a speaker, LEDs, and a control system 10. The first control circuit 101 in the control system 10 is the main MCU of the molecular sieve oxygen generator 20, and the main MCU is located on the main board 203. The fan monitoring circuit 102, as shown... Figure 5 The circuit includes a fan control subcircuit and a fan detection subcircuit. The oxygen generation control circuit 103 includes a compressor control module 1031 and a solenoid valve control module 1032. Furthermore, the first temperature sensor 1041 in the first temperature detection circuit 104 is mounted on the main board 203, and the second temperature sensor 1051 in the second temperature detection circuit 105 is mounted on the power adapter 205. Additionally, the main MCU controls the speaker and LEDs to implement an audible and visual alarm.

[0134] In some embodiments, the fan monitoring circuit 102 detects the operating current of the fan 201 through a sampling resistor and converts it into a sampling voltage. The sampling voltage is then sent as a sampling signal to an operational amplifier for amplification to obtain a first detection signal. The operational amplifier outputs the first detection signal to the first control circuit 101. The first control circuit 101 determines the current operating current of the fan 201 based on the first detection signal and compares it with a preset current range. If the current operating current exceeds the preset current range, it indicates that the fan 201 is in an abnormal state. At this time, the first control circuit 101 can send a first control signal to the oxygen generation control circuit 103, causing the oxygen generation control circuit 103 to control the oxygen generator 20 to stop oxygen generation and / or release the oxygen inside the oxygen generator 20 to the outside.

[0135] The preset current range can be determined based on the rated operating current of fan 201, such as 50% to 150% of the rated operating current. For example, if the rated operating current of fan 201 is 0.4A, then the preset current range is 0.2A (50% of the rated operating current) to 0.8A (150% of the rated operating current). When the current operating current of fan 201 is ≤0.2A or ≥0.8A, the first control circuit 101 can determine that the operating state of fan 201 is abnormal, and there is a risk of forming an oxygen-rich environment inside the casing.

[0136] Reference Figure 4When the operating current of fan 201 is less than 0.2A, the main MCU detects that the interface voltage Uo of the first input terminal SP / AD is less than 0.63V, indicating that fan 201 is open-circuited and stops rotating. Alternatively, when the operating current of fan 201 is greater than 0.8A, the main MCU detects that the interface voltage Uo of the first input terminal SP / AD is less than 2.52V, indicating that fan 201 is experiencing an overcurrent abnormality. In this case, the oxygen concentrator 20 can be stopped by controlling the compressor 202 to stop producing oxygen. At the same time, the solenoid valve 204 is activated to release oxygen from the adsorption tower 206 and pipeline of the oxygen concentrator 20. Then, the speaker and LED display are activated to provide audible and visual alarms, which can improve the reliability and safety of the oxygen concentrator 20.

[0137] In some embodiments, the first temperature sensor 1041 and the second temperature sensor 1051 respectively detect the ambient temperature and send their respective temperature detection signals to the first control circuit 101. The first control circuit 101 can determine its ambient temperature based on the first temperature detection signal and determine the ambient temperature of the power supply circuit based on the second temperature detection signal. The first control circuit 101 also calculates the difference between the ambient temperatures of the first control circuit 101 and the power supply circuit to obtain the ambient temperature difference value between the first control circuit 101 and the power supply circuit.

[0138] The first control circuit 101 can compare the ambient temperature difference with a preset difference threshold, and when the ambient temperature difference exceeds the preset difference threshold, send a sixth control signal to the oxygen generation control circuit 103, causing the oxygen generation control circuit 103 to control the oxygen generator 20 to stop generating oxygen and / or release the oxygen inside the oxygen generator 20 to the outside. The preset difference threshold can be determined according to actual application requirements.

[0139] For example, if the preset temperature difference threshold is 10°C, when the temperature difference between the area near the power adapter 205 of the oxygen concentrator 20 and the motherboard 203 is detected to be ≥10°C, it can be determined that the temperature of the power adapter 205 or the motherboard 203 is abnormal, posing a fire hazard. The first control circuit 101 can then send a sixth control signal to the oxygen generation control circuit 103. This is merely an example, and the embodiments of this application do not impose any limitations on it.

[0140] In some embodiments, the main MCU of the oxygen concentrator 20 determines the operating status of the fan 201, the ambient temperature of the mainboard 203, and the ambient temperature of the power adapter 205 based on the detection signals from the fan monitoring circuit 102, the first temperature detection circuit 104, and the second temperature detection circuit 105, respectively. When the operating current of the fan 201 is <0.2A, or when the operating current of the fan 201 is >0.8A, the main MCU can control the compressor 202 to stop, simultaneously control the solenoid valve 204 to release oxygen from inside the oxygen concentrator 20, and control the speaker and LED display to issue an audible and visual alarm.

[0141] When any of the following three abnormal temperature conditions occur: the ambient temperature detected by the first temperature sensor 1041 exceeds 65°C, the ambient temperature detected by the second temperature sensor 1051 exceeds 65°C, or the temperature difference detected by the first temperature sensor 1041 and the second temperature sensor 1051 exceeds 10°C, the main MCU can control the compressor 202 to stop, simultaneously control the solenoid valve 204 to release oxygen from inside the oxygen concentrator 20, and control the speaker and LED display to issue an audible and visual alarm. This prevents the formation of an oxygen-rich environment inside the oxygen concentrator 20, thus improving the reliability and safety of the oxygen concentrator 20.

[0142] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of this application may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0143] Similarly, it should be understood that, in order to simplify this application and aid in understanding one or more of the various aspects of the invention, in the description of exemplary embodiments of the present application above, various features of the present application are sometimes grouped together into a single embodiment, figure, or description thereof.

[0144] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

[0145] It should be noted that the various data-related processes in the embodiments of this application are carried out in compliance with the relevant data protection laws and policies of the country where the location is located, and with the authorization granted by the owner of the corresponding device.

Claims

1. A control system for an oxygen generator, characterized in that, The control system includes: a first control circuit, a fan monitoring circuit, and an oxygen generation control circuit; The output terminal of the fan monitoring circuit is electrically connected to the first input terminal of the first control circuit. The detection terminal of the fan monitoring circuit is used to electrically connect to the fan inside the oxygen concentrator. The fan monitoring circuit is used to detect the working status of the fan and generate a first detection signal, and to send the first detection signal to the first control circuit. The output terminal of the first control circuit is electrically connected to the input terminal of the oxygen generation control circuit. The first control circuit is used to receive the first detection signal and send a first control signal to the oxygen generation control circuit when the first detection signal indicates that the fan is in an abnormal state, so that the oxygen generation control circuit responds to the first control signal to control the oxygen generator to stop generating oxygen, and / or release the oxygen inside the oxygen generator to the outside.

2. The control system according to claim 1, characterized in that, The fan monitoring circuit includes a sampling module and an amplification module; The output terminal of the sampling module is electrically connected to the input terminal of the amplification module, the detection terminal of the sampling module is used to electrically connect to the fan, the sampling module is used to detect the working status of the fan and acquire the sampling signal, and send the sampling signal to the amplification module; The output terminal of the amplification module is electrically connected to the first input terminal of the first control circuit. The amplification module is used to amplify the sampled signal, generate the first detection signal, and send the first detection signal to the first control circuit.

3. The control system according to claim 2, characterized in that, The sampling module includes: A sampling resistor is provided, with its first end electrically connected to the input terminal of the amplification module and its second end electrically connected to the fan. The sampling resistor is used to detect the operating current of the fan and convert it into a sampling voltage, and to send the sampling voltage as the sampling signal to the amplification module.

4. The control system according to claim 2, characterized in that, The amplification module includes: An operational amplifier is provided, wherein the non-inverting input terminal of the operational amplifier is electrically connected to the output terminal of the sampling module, and the output terminal of the operational amplifier is electrically connected to the inverting input terminal and the first input terminal of the first control circuit, respectively. The operational amplifier is used to amplify the sampling signal to obtain the first detection signal and send the first detection signal to the first control circuit.

5. The control system according to claim 1, characterized in that, The oxygen generation control circuit includes: The compressor control module has its input terminal electrically connected to the first output terminal of the first control circuit, and its output terminal electrically connected to the compressor of the oxygen concentrator. The compressor control module is used to control the compressor to stop in response to a first sub-signal sent by the first control circuit, so that the oxygen concentrator stops producing oxygen. And / or, The solenoid valve control module has its input terminal electrically connected to the second output terminal of the first control circuit, and its output terminal electrically connected to the solenoid valve of the oxygen concentrator. The compressor control module is used to control the solenoid valve to open in response to the second sub-signal sent by the first control circuit, so that the oxygen concentrator releases internal oxygen. The first control signal includes the first sub-signal and the second sub-signal.

6. The control system according to any one of claims 1-5, characterized in that, The control system further includes a first temperature detection circuit, which is used to detect the ambient temperature of the first control circuit, generate a first temperature detection signal, and send the first temperature detection signal to the first control circuit. The second input terminal of the first control circuit is electrically connected to the output terminal of the first temperature detection circuit. The first control circuit is further configured to send a fourth control signal to the oxygen generation control circuit when the first temperature detection signal indicates that the ambient temperature of the first control circuit exceeds a first temperature threshold, so that the oxygen generation control circuit responds to the fourth control signal to control the oxygen generator to stop generating oxygen, and / or release the oxygen inside the oxygen generator to the outside.

7. The control system according to any one of claims 1-5, characterized in that, The control system further includes a second temperature detection circuit, which is used to detect the ambient temperature of the power circuit inside the oxygen generator, generate a second temperature detection signal, and send the second temperature detection signal to the first control circuit. The third input terminal of the first control circuit is electrically connected to the output terminal of the second temperature detection circuit. The first control circuit is also used to send a fifth control signal to the oxygen generation control circuit when the second temperature detection signal indicates that the ambient temperature of the power supply circuit exceeds the second temperature threshold, so that the oxygen generation control circuit controls the oxygen generator to stop generating oxygen in response to the fifth control signal, and / or releases the oxygen inside the oxygen generator to the outside.

8. The control system according to any one of claims 1-5, characterized in that, The control system further includes: A sound alarm circuit, wherein the control terminal of the sound alarm circuit is electrically connected to the first alarm output terminal of the first control circuit, and the sound alarm circuit is used to output a sound alarm signal under the control of a first alarm signal sent by the first control circuit. And / or, An optical alarm circuit is provided, wherein the control terminal of the optical alarm circuit is electrically connected to the second alarm output terminal of the first control circuit, and the optical alarm circuit is used to output an optical alarm signal under the control of the second alarm signal sent by the first control circuit.

9. An oxygen generator, characterized in that, The oxygen generator includes a fan and a control system as described in any one of claims 1-8, wherein the detection terminal of the fan monitoring circuit in the control system is electrically connected to the fan.

10. The oxygen generator according to claim 9, characterized in that, The oxygen generator includes a first circuit board, and the first control circuit in the control system is disposed on the first circuit board; The first temperature detection circuit in the control system includes a first temperature sensor, which is mounted on the first circuit board.

11. The oxygen generator according to claim 9, characterized in that, The oxygen generator includes a power supply circuit, and the second temperature detection circuit in the control system includes a second temperature sensor, which is located in the power supply circuit.

Images