A power supply circuit and an oxygen generator

Abstract

This invention provides a power supply circuit and an oxygen generator. The power supply circuit includes an input unit, an input protection unit, and a voltage adjustment module. The input terminals of both the input unit and the input protection unit are connected to the output terminals of the power supply. The output terminals of both the input unit and the input protection unit are connected to the input terminal of the voltage adjustment module, which adjusts the AC voltage output by the power supply to DC voltage. When powered on, the input protection unit is on, and the input unit is off. During normal operation, the input protection unit is off, and the input unit is on. During abnormal operation, both the input protection unit and the input unit are off. This power supply circuit can be protected by the input protection unit, reducing the risk of device damage.

Description

Technical Field

[0001] This utility model relates to the technical field of power supply, and in particular to a power supply circuit and an oxygen generating device. Background Technology

[0002] During the operation of the power supply circuit of the drive motor, overvoltage problems seriously threaten the stability and safety of the circuit, and may cause a series of faults and equipment damage.

[0003] Currently, common overvoltage protection schemes have many shortcomings. Some traditional overvoltage protection circuits use simple Zener diodes or varistors for overvoltage suppression. While Zener diodes can clamp the voltage by reverse breakdown during overvoltage, their power handling capacity is limited. Faced with large overvoltage energy surges, they may not be able to effectively protect the circuit, or even be damaged themselves. Varistors have a relatively slow response speed, making it difficult to act in time during rapid voltage rises, resulting in protection delays and leaving sensitive components in the circuit still at risk of overvoltage damage. Utility Model Content

[0004] This utility model mainly provides a power supply circuit and an oxygen generator, which can provide protection for the power supply circuit of the motor and reduce the risk of device damage.

[0005] To solve the above-mentioned technical problems, the first technical solution adopted by this utility model is: to provide a power supply circuit, comprising:

[0006] The system includes an input unit, an input protection unit, and a voltage adjustment module. The input terminals of the input unit and the input protection unit are both connected to the output terminals of the power supply. The output terminals of the input unit and the input protection unit are both connected to the input terminals of the voltage adjustment module. The voltage adjustment module is used to adjust the AC voltage output by the power supply to DC voltage.

[0007] Upon power-up, the input protection unit is activated, and the input unit is deactivated.

[0008] During normal operation, the input protection unit is disconnected, and the input unit is turned on.

[0009] During abnormal operation, both the input protection unit and the input unit are disconnected.

[0010] In one embodiment, the input unit includes a first input switch, the input terminal of which is connected to the output terminal of a power supply, and the output terminal of the first input switch is connected to the input terminal of the voltage adjustment module; and / or,

[0011] The input protection unit includes a second input switch and a thermistor, the second input switch and the thermistor are connected in series, and the second input switch and the thermistor are used to connect between the output terminal of the power supply and the input terminal of the voltage adjustment module.

[0012] In one embodiment, the input unit includes a first input switch, the input terminal of which is connected to the output terminal of a power supply, and the output terminal of the first input switch is connected to the input terminal of the voltage adjustment module.

[0013] The input protection unit includes a second input switch and a thermistor. The input terminal of the second input switch is connected to the input terminal of the first input switch, and the input terminal of the second input switch is used to connect to the output terminal of the power supply. The output terminal of the second input switch is connected to the input terminal of the thermistor, and the output terminal of the thermistor is connected to the output terminal of the first input switch and the input terminal of the voltage adjustment module.

[0014] In one embodiment, the voltage adjustment module includes a first rectifier unit, a boost unit, a buck unit, and an output unit; the input terminal of the first rectifier unit is connected to the output terminal of the input unit and the output terminal of the input protection unit, the input terminal of the boost unit is connected to the output terminal of the first rectifier unit, the output terminal of the boost unit is connected to the input terminal of the buck unit, and the input terminal of the output unit is connected to the output terminal of the buck unit.

[0015] In one embodiment, the first rectifier unit includes a first diode, a second diode, a third diode, and a fourth diode. The first and second diodes are connected in series, and a first node between the first and second diodes is connected to the output terminal of the input unit and the output terminal of the input protection unit. The third and fourth diodes are connected in series, and a second node between the third and fourth diodes is used to connect to the output terminal of the power supply. The cathode of the second diode is connected to the cathode of the third diode and is connected to the input terminal of the boost unit. The anode of the first diode is connected to the anode of the fourth diode and is connected to the input terminal of the boost unit. And / or,

[0016] The boost unit includes a first inductor, a first switch, a fifth diode, and a first capacitor. A first terminal of the first inductor is connected to the output terminal of the first rectifier unit. A first terminal of the first switch is connected to a second terminal of the first inductor. A second terminal of the first switch is connected to the input terminal of the first rectifier unit. A first terminal of the fifth diode is connected to a second terminal of the first inductor. A first terminal of the first capacitor is connected to a second terminal of the fifth diode and the input terminal of the buck unit. A second terminal of the first capacitor is connected to a second terminal of the first switch and the input terminal of the buck unit; and / or,

[0017] The output unit includes a first output switch, a second output switch, a third output switch, a fourth output switch, a fifth output switch, and a sixth output switch. The first terminal of the first output switch is connected to the step-down unit. The first terminal of the fourth output switch is connected to the second terminal of the first output switch, and the second terminal of the fourth output switch is connected to the step-down unit. The first terminal of the second output switch is connected to the step-down unit. The first terminal of the fifth output switch is connected to the second terminal of the second output switch, and the second terminal of the fifth output switch is connected to the step-down unit. The first terminal of the third output switch is connected to the step-down unit. The first terminal of the sixth output switch is connected to the second terminal of the third output switch, and the second terminal of the sixth output switch is connected to the step-down unit.

[0018] In one embodiment, the step-down unit includes an inverter unit, a transformer, and a second rectifier unit. The inverter unit is connected to the output terminal of the step-up unit and the transformer. The input terminal of the second rectifier unit is connected to the transformer, and the output terminal of the second rectifier unit is connected to the input terminal of the output unit.

[0019] In one embodiment, the inverter unit includes a second switch and a third switch, a first terminal of the second switch being connected to the output terminal of the boost unit, a first terminal of the third switch being connected to the second terminal of the second switch and the transformer, and a second terminal of the third switch being connected to the output terminal of the boost unit; and / or,

[0020] The second rectifier unit includes a sixth diode, a seventh diode, an eighth diode, and a ninth diode. The sixth diode and the seventh diode are connected in series, and the third node between the sixth diode and the seventh diode is connected to the transformer. The eighth diode and the ninth diode are connected in series, and the fourth node between the eighth diode and the ninth diode is connected to the transformer. The cathode of the seventh diode is connected to the cathode of the eighth diode and is connected to the input terminal of the output unit. The anode of the sixth diode is connected to the anode of the ninth diode and is connected to the input terminal of the output unit.

[0021] In one embodiment, the step-down unit further includes a second filter unit connected between the inverter unit and the transformer; and / or,

[0022] A third filtering unit is connected between the second rectifier unit and the output unit; and / or,

[0023] The second inductor is connected between the inverter unit and the transformer.

[0024] In one embodiment, the voltage adjustment module further includes a first filtering unit, which is connected between the first rectifier unit and the boost unit.

[0025] To solve the above-mentioned technical problems, the second technical solution adopted by this utility model is to provide an oxygen generating device, which includes the power supply circuit of any of the above-mentioned components.

[0026] The beneficial effects of this utility model are as follows: Unlike existing technologies, the power supply circuit provided by this utility model includes an input unit, an input protection unit, and a voltage adjustment module. The input terminals of both the input unit and the input protection unit are connected to the output terminals of the power supply. The output terminals of both the input unit and the input protection unit are connected to the input terminals of the voltage adjustment module. The voltage adjustment module adjusts the AC voltage output by the power supply to a DC voltage. When powered on, the input protection unit is on, and the input unit is off. During normal operation, the input protection unit is off, and the input unit is on. During abnormal operation, both the input protection unit and the input unit are off. This utility model's power supply circuit can be protected by the input protection unit, reducing the risk of device damage. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the first embodiment of the power supply circuit of this utility model;

[0029] Figure 2 This is a schematic diagram of the second embodiment of the power supply circuit of this utility model;

[0030] Figure 3 This is a schematic diagram of the third embodiment of the power supply circuit of this utility model;

[0031] Figure 4 This is a schematic diagram of the structure of an embodiment of the oxygen generating device of this utility model. Detailed Implementation

[0032] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0033] In the following description, specific details such as particular system architectures, interfaces, and technologies are presented for illustrative purposes rather than for limiting purposes, in order to provide a thorough understanding of this application.

[0034] In this article, the term "and / or" simply describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Additionally, the character " / " generally indicates that the preceding and following related objects have an "or" relationship. Furthermore, "more" in this article means two or more objects.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0036] Before providing a further detailed description of the embodiments of this application, the nouns and terms involved in the embodiments of this application will be explained, and the nouns and terms involved in the embodiments of this application shall be interpreted as follows.

[0037] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] See Figure 1 , Figure 1 This is a schematic diagram of the power supply circuit of this utility model, specifically including: an input unit 11, an input protection unit 13, and a voltage adjustment module 12. The input terminals of both the input unit 11 and the input protection unit 13 are connected to the output terminal of the power supply. The output terminals of both the input unit 11 and the input protection unit 13 are connected to the input terminal of the voltage adjustment module 12. The voltage adjustment module is used to adjust the AC voltage output by the power supply to a DC voltage. In a specific embodiment, the input unit 11 and the input protection unit 13 are connected in parallel, and when the power supply circuit is connected to the power supply, they are respectively connected between the output terminal of the power supply and the input terminal of the voltage adjustment module 12.

[0039] When powered on, input protection unit 13 is turned on and input unit 11 is turned off; during normal operation, input protection unit 13 is turned off and input unit 11 is turned on; during abnormal operation, both input protection unit 13 and input unit 11 are turned off.

[0040] Combination Figure 3 In one embodiment of this application, the input unit 11 includes a first input switch RYL2, the input terminal of the first input switch RYL2 is used to connect to the output terminal of the power supply, and the output terminal of the first input switch RYL2 is connected to the input terminal of the voltage adjustment module 12.

[0041] In one embodiment of this application, the input protection unit 13 includes a second input switch RYL1 and a thermistor RT1. The first end of the second input switch RYL1 and the first end of the thermistor RT1 are connected, and the second input switch RYL1 and the thermistor RT1 are connected in series. The second input switch RYL1 and the thermistor RT1 are used to connect between the output terminal of the power supply and the input terminal of the voltage adjustment module 12.

[0042] In one embodiment of this application, the input unit 11 includes a first input switch RYL2, the input terminal of the first input switch RYL2 is used to connect to the output terminal of the power supply, and the output terminal of the first input switch RYL2 is connected to the input terminal of the voltage adjustment module 12.

[0043] The input protection unit 13 includes a second input switch RYL1 and a thermistor RT1. The input terminal of the second input switch RYL1 is connected to the input terminal of the first input switch RYL2, and the input terminal of the second input switch RYL1 is used to connect to the output terminal of the power supply. The output terminal of the second input switch RYL1 is connected to the input terminal of the thermistor RT1, and the output terminal of the thermistor RT1 is connected to the output terminal of the first input switch RYL2 and the input terminal of the voltage adjustment module 12.

[0044] In one embodiment, the first input switch RYL2 and the second input switch RYL1 are relays. In other embodiments, the first input switch RYL2 and the second input switch RYL1 can also be other types of switches, such as transistors or triodes, without any specific limitation.

[0045] Further, see Figure 2 The voltage adjustment module 12 is used to adjust the AC voltage output by the power supply to DC voltage.

[0046] It is worth noting that in this invention, the AC voltage of the power input is a wide range of AC voltages, such as 90-264Vac, which is suitable for the mains power standards of different regions.

[0047] In one embodiment, the voltage adjustment module 12 includes a first rectifier unit 121, a boost unit 123, a buck unit 124, and an output unit 130. The input terminal of the first rectifier unit 121 is connected to the output terminal of the input unit 11 and the output terminal of the input protection unit 13. The input terminal of the boost unit 123 is connected to the output terminal of the first rectifier unit 121. The output terminal of the boost unit 123 is connected to the input terminal of the buck unit 124. The input terminal of the output unit 130 is connected to the output terminal of the buck unit 124.

[0048] Furthermore, the voltage adjustment module 12 of this utility model also includes: a first filter unit 122, which is connected between the first rectifier unit 121 and the boost unit 123.

[0049] The first rectifier unit 121 is a rectifier bridge. For example... Figure 3 As shown, the first rectifier unit 121 includes a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4. The first diode D1 and the second diode D2 are connected in series, and a first node n1 between the first diode D1 and the second diode D2 is connected to the output terminal of the input unit 11 and the output terminal of the input protection unit 13. The third diode D3 and the fourth diode D4 are connected in series, and a second node n2 between the third diode D3 and the fourth diode D4 is used to connect to the output terminal of the power supply. The cathode of the second diode D2 is connected to the cathode of the third diode D3 and is also connected to the input terminal of the boost unit 123. The anode of the first diode D1 is connected to the anode of the fourth diode D4 and is also connected to the input terminal of the boost unit 123. During the positive half-cycle of the AC voltage, the second diode D2 and the fourth diode D4 are conducting. During the negative half-cycle of the AC voltage, the first diode D1 and the third diode D3 are conducting.

[0050] The first filter unit 122 includes a capacitor C1, which is connected in parallel with the first rectifier unit 121. Specifically, the first end of the capacitor C1 is connected to the cathodes of the second diode D2 and the third diode D3, and the second end of the capacitor C1 is connected to the anodes of the first diode D1 and the fourth diode D4.

[0051] Specifically, input protection unit 13 is normally on, while input unit 11 is normally off. Specifically, under normal conditions, the second input switch RYL1 is closed, and the first input switch RYL2 is off. When the power supply is connected and powered on, since input protection unit 13 is normally on and input unit 11 is normally off, the AC voltage supplied by the power supply flows through input protection unit 13 to voltage adjustment module 12, specifically through first rectifier unit 121 to capacitor C1. When the voltage of capacitor C1 is detected to be too high (e.g., greater than a certain value), it indicates that the AC voltage exceeds the preset range, and an abnormal operating state is entered. The second input switch RYL1 is switched from closed to off, while the first input switch RYL2 remains off, thus disconnecting both input protection unit 13 and input unit 11, thereby protecting the power supply circuit. When the voltage of capacitor C1 is detected to be normal, it indicates that the AC voltage has not exceeded the preset range. At this time, the normal operation state is entered. The second input switch RYL1 is switched from closed to closed, and the first input switch RYL2 is switched from closed to closed, so that the input protection unit 13 is disconnected and the input unit 11 is turned on. At this time, the AC voltage (Vin) provided by the power supply flows through the input unit 11 to the first rectifier unit 121, and the power supply circuit starts to work.

[0052] It should be noted that the first input switch RYL2 and the second input switch RYL1 are connected to a switch control circuit (not shown in the figure). This switch control circuit can be, for example, a microcontroller, or a logic control circuit conforming to the control logic of this invention. Specifically, the switch control circuit can detect the voltage of capacitor C1 (the voltage of capacitor C1 can represent the bus voltage). When the voltage of capacitor C1 is detected to be too high, it indicates that the AC voltage exceeds the preset range. At this time, the switch control circuit provides a control signal to the second input switch RYL1, switching the second input switch RYL1 from closed to closed. When the voltage of capacitor C1 is detected to be normal, it indicates that the AC voltage does not exceed the preset range. At this time, the switch control circuit provides a control signal to the second input switch RYL1, switching the second input switch RYL1 from closed to closed, and provides a control signal to the first input switch RYL2, switching the first input switch RYL2 from closed to closed.

[0053] Furthermore, when an abnormality occurs during normal operation, the input protection unit 13 switches from open to closed, and the input unit 11 switches from closed to open. It is worth noting that after detecting that the AC voltage is within the preset range and the power supply circuit is operating normally, if an abnormal power outage occurs, the second input switch RYL1 switches from closed to closed, causing the input protection unit 13 to switch from open to closed, and the first input switch RYL2 switches from closed to closed, causing the input unit 11 to switch from closed to open, thus entering the initial state. When the abnormal power outage is restored and power is restored, the input protection unit 13 turns on, the input unit 11 turns off, and the voltage of capacitor C1 is re-detected. Based on the detection result, the system switches between normal and abnormal operation. The specific process is the same as described above and will not be repeated here.

[0054] It is worth noting that the power supply circuit of this invention also includes a varistor R, which is connected in parallel between the power supply terminals. The varistor R provides overvoltage protection. When an overvoltage occurs in the circuit and exceeds the threshold voltage of the varistor R, the resistance of the varistor R decreases rapidly, clamping the voltage to a relatively fixed value, limiting the voltage rise in the circuit, and protecting sensitive downstream devices. In a power supply circuit, this can prevent excessive voltage from damaging components such as chips and transistors. This invention simultaneously incorporates a varistor R and an input protection unit 13 in the power supply circuit, providing dual overvoltage protection. Specifically, when the first input switch RYL2 is closed, the varistor R and the thermistor RT1 divide the voltage of the power input Vin.

[0055] Furthermore, one end of the thermistor RT1 in the input protection unit 13 is connected to the second input switch RYL1, and the other end is connected to the anode of the second diode D2. The thermistor RT1 can be used as a current limiting resistor and also as an overheat protection resistor. For example, it can be used in conjunction with the external control circuit. When the temperature is too high, in order to avoid damage caused by overheating, the protection mechanism is triggered when the temperature reaches the threshold to cut off the circuit.

[0056] In this invention, the boost unit 123 can also perform power factor correction. The boost unit 123 includes: a first inductor L1, a first switch T1, a fifth diode D5, and a first capacitor C2. The first end of the first inductor L1 is connected to the output terminal of the first rectifier unit 121, specifically to the cathode of the third diode D3 of the first rectifier unit 121. The first end of the first switch T1 is connected to the second end of the first inductor L1, and the second end of the first switch T1 is connected to the input terminal of the first rectifier unit 121, specifically to the anode of the fourth diode D4 of the first rectifier unit 121. The control terminal of the first switch T1 is used to connect to the main control chip. The first end of the fifth diode D5 is connected to the second end of the first inductor L1; the first end of the first capacitor C2 is connected to the second end of the fifth diode D5 and the input terminal of the buck unit 124, and the second end of the first capacitor C2 is connected to the second end of the first switch T1 and the input terminal of the buck unit 124. The first switch T1 is periodically turned on and off under the control signal output by the main control chip. When the first switch T1 is turned on, the first inductor L1 stores energy, and current flows through the first inductor L1 and the first switch T1 to form a circuit. When the first switch T1 is turned off, the energy stored in the first inductor L1 flows out through the fifth diode D5 and charges the first capacitor C2, which can stabilize the output voltage signal. This operating mode makes the input current waveform closer to the input voltage waveform, improves the power factor, and enables voltage boosting. In one embodiment, if the input AC voltage is 90-264Vac, the boosted voltage can be, for example, 400Vdc, and it is a DC voltage.

[0057] The step-down unit 124 is connected to the step-up unit 123. In one embodiment, the step-down unit 124 includes an inverter unit 125, a transformer T, and a second rectifier unit 127. The inverter unit 125 is connected to the output terminal of the step-up unit 123 and the transformer T; the input terminal of the second rectifier unit 127 is connected to the transformer T, and the output terminal of the second rectifier unit 127 is connected to the input terminal of the output unit 130.

[0058] In one embodiment, the inverter unit 125 includes a second switch T2 and a third switch T3. The first end of the second switch T2 is connected to the output end of the boost unit 123, specifically to the second end (cathode) of the fifth diode D5 in the boost unit 123. The first end of the third switch T3 is connected to the second end of the second switch T2 and the input end of the transformer T (specifically, the input end of the primary coil of the transformer T). The second end of the third switch T3 is connected to the output end of the boost unit 123, specifically to the second end of the first switch T1 in the boost unit 123 and the second end of the first capacitor C2. The control ends of the second switch T2 and the third switch T3 are used to connect to the main control chip.

[0059] Specifically, the main control chip controls the second switch T2 and the third switch T3 to alternately turn on and off, controlling the current flow and energy transfer of the primary coil of transformer T. The output voltage and power are regulated by adjusting the on-time (duty cycle) and switching frequency of the second switch T2 and the third switch T3.

[0060] Transformer T provides electrical isolation and voltage transformation for the voltage signal, transferring energy from the primary coil to the secondary coil. Furthermore, transformer T can achieve voltage reduction by setting a preset turns ratio (the turns ratio of the primary coil to the secondary coil).

[0061] Furthermore, the step-down unit 124 also includes a second filter unit 126. The second filter unit 126 is connected between the inverter unit 125 and the transformer T. Specifically, the transformer T includes a primary coil and a secondary coil. The input terminal of the primary coil is connected to the inverter unit 125, the output terminal of the primary coil is connected to the second filter unit 126, and the input and output terminals of the secondary coil are connected to the second rectifier unit 127.

[0062] The second filtering unit 126 includes capacitors C3 and C4 connected in series, and these capacitors C3 and C4 are connected in parallel with the inverter unit 125. Specifically, the input terminal of the primary coil is connected to the second terminal of the second switch T2, and the output terminal of the primary coil is connected to the node between capacitors C3 and C4. Capacitors C3 and C4 filter the voltage of the primary coil of transformer T, further smoothing the voltage and reducing ripple.

[0063] In one embodiment, the step-down unit 124 further includes a second inductor L2, which is connected between the inverter unit 125 and the transformer T. Specifically, the first end of the second inductor L2 is connected to the second end of the second switch T2, and the second end of the second inductor L2 is connected to the input terminal of the primary coil of the transformer T. During the switching process between the second switch T2 and the third switch T3, the second inductor L2 helps maintain the continuity of the current, reduces current surges, and ensures stable circuit operation.

[0064] Furthermore, the step-down unit 124 also includes a third filter unit 128, which is connected between the second rectifier unit 127 and the output unit 130.

[0065] In one specific embodiment, the second rectifier unit 127 has the same structure as the first rectifier unit 121 described above, and is also a rectifier bridge. For example... Figure 3As shown, the second rectifier unit 127 includes a sixth diode D6, a seventh diode D7, an eighth diode D8, and a ninth diode D9. The sixth diode D6 and the seventh diode D7 are connected in series, and the third node n3 between the sixth diode D6 and the seventh diode D7 is connected to the transformer T (specifically, the input terminal of the secondary coil of the transformer T). The eighth diode D8 and the ninth diode D9 are connected in series, and the fourth node n4 between the eighth diode D8 and the ninth diode D9 is connected to the transformer T (specifically, the output terminal of the secondary coil of the transformer T). The cathode of the seventh diode D7 is connected to the cathode of the eighth diode D8 and connected to the input terminal of the output unit 130. The anode of the sixth diode D6 is connected to the anode of the ninth diode D9 and connected to the input terminal of the output unit 130.

[0066] The third filter unit 128 includes a capacitor C5. The first end of the capacitor C5 is connected to the cathodes of the seventh diode D7 and the eighth diode D8, and the second end of the capacitor C5 is connected to the anodes of the sixth diode D6 and the ninth diode D9.

[0067] Output unit 130 includes a first output switch Q1, a second output switch Q2, a third output switch Q3, a fourth output switch Q4, a fifth output switch Q5, and a sixth output switch Q6. The first terminal of the first output switch Q1 is connected to the step-down unit 124, specifically to the cathode of the eighth diode D8 and the first terminal of capacitor C5. The first terminal of the fourth output switch Q4 is connected to the second terminal of the first output switch Q1, and the second terminal of the fourth output switch Q4 is connected to the step-down unit 124, specifically to the anode of the ninth diode D9 and the second terminal of capacitor C5. The first terminal of the second output switch Q2 is connected to the step-down unit 124, specifically to the cathode of the eighth diode D8 and the first terminal of capacitor C5. The first terminal of the fifth output switch Q5 is connected to the second terminal of the second output switch Q2, and the second terminal of the fifth output switch Q5 is connected to the step-down unit 124, specifically to the anode of the ninth diode D9 and the second terminal of capacitor C5. The first terminal of the third output switch Q3 is connected to the step-down unit 124, specifically to the cathode of the eighth diode D8 and the first terminal of capacitor C5. The first terminal of the sixth output switch Q6 is connected to the second terminal of the third output switch Q3, and the second terminal of the sixth output switch Q6 is connected to the step-down unit 124, specifically to the anode of the ninth diode D9 and the second terminal of capacitor C5. Furthermore, the control terminals of the first output switches Q1, Q2, Q3, Q4, Q5, and Q6 are used to connect to the main control chip. In practical applications, the main control chip can control the conduction of some of the first output switches Q1, Q2, Q3, Q4, Q5, and Q6 as needed, and adjust the duty cycle of the conducting switches to output a DC voltage of a predetermined frequency. This drives downstream devices such as motors, regulates motor speed, and meets the operating requirements of the motor under different working conditions.

[0068] It is worth noting that the power supply circuit of this utility model is equipped with an input protection unit, which can detect the compatibility of the power supply when it is powered on, preventing damage to the power supply circuit components due to excessively high voltage. The inclusion of a boost unit 123 and a buck unit 124, with the boost unit 123 performing power factor correction and voltage boosting, improves the power factor, reduces reactive power loss, and enhances energy utilization efficiency. Furthermore, it can operate more efficiently and stably under higher DC voltage input. When transmitting energy at higher voltage, the current is relatively smaller at the same power, reducing line losses and the requirements for conductor specifications. Simultaneously, the higher voltage also facilitates flexible adjustment of the output voltage through transformer turns ratio.

[0069] See Figure 4 , Figure 4 This is a schematic diagram of the structure of an embodiment of the oxygen generating device of this utility model. The oxygen generating device 40 includes a power supply circuit 41, which is the aforementioned... Figures 1 to 3The power supply circuit 41 shown in any embodiment.

[0070] The above are merely embodiments of this utility model and do not limit the scope of patent protection of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of this utility model.

Claims

1. A power supply circuit, characterized by comprising: include: The system includes an input unit, an input protection unit, and a voltage adjustment module. The input terminals of the input unit and the input protection unit are both connected to the output terminals of the power supply. The output terminals of the input unit and the input protection unit are both connected to the input terminals of the voltage adjustment module. The voltage adjustment module is used to adjust the AC voltage output by the power supply to a DC voltage. When powered on, the input protection unit is turned on, and the input unit is turned off; During normal operation, the input protection unit is disconnected, and the input unit is turned on. During abnormal operation, both the input protection unit and the input unit are disconnected.

2. The power supply circuit of claim 1, wherein The input unit includes a first input switch, the input terminal of which is connected to the output terminal of a power supply, and the output terminal of which is connected to the input terminal of the voltage adjustment module; and / or, The input protection unit includes a second input switch and a thermistor, the second input switch and the thermistor are connected in series, and the second input switch and the thermistor are used to connect between the output terminal of the power supply and the input terminal of the voltage adjustment module.

3. The power supply circuit according to claim 1, characterized in that, The input unit includes a first input switch, the input terminal of which is connected to the output terminal of the power supply, and the output terminal of the first input switch is connected to the input terminal of the voltage adjustment module. The input protection unit includes a second input switch and a thermistor. The input terminal of the second input switch is connected to the input terminal of the first input switch, and the input terminal of the second input switch is used to connect to the output terminal of the power supply. The output terminal of the second input switch is connected to the input terminal of the thermistor, and the output terminal of the thermistor is connected to the output terminal of the first input switch and the input terminal of the voltage adjustment module.

4. The power supply circuit according to claim 1, characterized in that, The voltage adjustment module includes a first rectifier unit, a boost unit, a buck unit, and an output unit; The input terminal of the first rectifier unit is connected to the output terminal of the input unit and the output terminal of the input protection unit. The input terminal of the boost unit is connected to the output terminal of the first rectifier unit. The output terminal of the boost unit is connected to the input terminal of the buck unit. The input terminal of the output unit is connected to the output terminal of the buck unit.

5. The power supply circuit according to claim 4, characterized in that, The first rectifier unit includes a first diode, a second diode, a third diode, and a fourth diode. The first and second diodes are connected in series, and a first node between the first and second diodes connects to the output terminal of the input unit and the output terminal of the input protection unit. The third and fourth diodes are connected in series, and a second node between the third and fourth diodes connects to the output terminal of the power supply. The cathode of the second diode is connected to the cathode of the third diode and to the input terminal of the boost unit. The anode of the first diode is connected to the anode of the fourth diode and to the input terminal of the boost unit. And / or, The boost unit includes a first inductor, a first switch, a fifth diode, and a first capacitor. A first terminal of the first inductor is connected to the output terminal of the first rectifier unit. A first terminal of the first switch is connected to a second terminal of the first inductor. A second terminal of the first switch is connected to the input terminal of the first rectifier unit. A first terminal of the fifth diode is connected to a second terminal of the first inductor. A first terminal of the first capacitor is connected to a second terminal of the fifth diode and the input terminal of the buck unit. A second terminal of the first capacitor is connected to a second terminal of the first switch and the input terminal of the buck unit; and / or, The output unit includes a first output switch, a second output switch, a third output switch, a fourth output switch, a fifth output switch, and a sixth output switch. The first terminal of the first output switch is connected to the step-down unit. The first terminal of the fourth output switch is connected to the second terminal of the first output switch, and the second terminal of the fourth output switch is connected to the step-down unit. The first terminal of the second output switch is connected to the step-down unit. The first terminal of the fifth output switch is connected to the second terminal of the second output switch, and the second terminal of the fifth output switch is connected to the step-down unit. The first terminal of the third output switch is connected to the step-down unit. The first terminal of the sixth output switch is connected to the second terminal of the third output switch, and the second terminal of the sixth output switch is connected to the step-down unit.

6. The power supply circuit according to claim 4, characterized in that, The step-down unit includes an inverter unit, a transformer, and a second rectifier unit. The inverter unit is connected to the output terminal of the step-up unit and the transformer. The input terminal of the second rectifier unit is connected to the transformer, and the output terminal of the second rectifier unit is connected to the input terminal of the output unit.

7. The power supply circuit according to claim 6, characterized in that, The inverter unit includes a second switch and a third switch. The first end of the second switch is connected to the output end of the boost unit. The first end of the third switch is connected to the second end of the second switch and the transformer. The second end of the third switch is connected to the output end of the boost unit. And / or, The second rectifier unit includes a sixth diode, a seventh diode, an eighth diode, and a ninth diode. The sixth diode and the seventh diode are connected in series, and the third node between the sixth diode and the seventh diode is connected to the transformer. The eighth diode and the ninth diode are connected in series, and the fourth node between the eighth diode and the ninth diode is connected to the transformer. The cathode of the seventh diode is connected to the cathode of the eighth diode and is connected to the input terminal of the output unit. The anode of the sixth diode is connected to the anode of the ninth diode and is connected to the input terminal of the output unit.

8. The power supply circuit according to claim 6, characterized in that, The step-down unit further includes a second filter unit, which is connected between the inverter unit and the transformer; and / or, A third filtering unit is connected between the second rectifier unit and the output unit; and / or, The second inductor is connected between the inverter unit and the transformer.

9. The power supply circuit according to claim 4, characterized in that, The voltage adjustment module further includes a first filtering unit, which is connected between the first rectifier unit and the boost unit.

10. An oxygen generating device, characterized in that, The oxygen generating device includes the power supply circuit described in any one of claims 1 to 9.

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