A power supply circuit and a portable oxygen generator

Abstract

The application provides a power supply circuit and a portable oxygen generator, wherein the power supply circuit is used for being connected with a load, and the power supply circuit comprises an interface circuit, a switching circuit, a control circuit, a boosting circuit and a driving circuit. The interface circuit is used for being connected with a first power supply; the switching circuit is connected with the interface circuit, and the switching circuit is also used for being connected with a second power supply; the control circuit is connected with the switching circuit, the interface circuit and the second power supply respectively, and the control circuit is used for controlling the switching circuit to switch the connection between the interface circuit and the second power supply; the boosting circuit is connected with the switching circuit; and the driving circuit is connected between the boosting circuit and the load, and the driving circuit is used for transforming the direct-current output voltage of the boosting circuit into alternating-current working voltage. In the above manner, the power supply demand in various scenes can be met, the stable operation of the power supply circuit and the electronic equipment is ensured, and the appropriate voltage and current supply are provided for the electronic equipment.

Description

Technical Field

[0001] This application relates to the field of power supply technology, and in particular to a power supply circuit and a portable oxygen concentrator. Background Technology

[0002] As electronic devices develop towards miniaturization, high efficiency, and intelligence, the design of power supply circuits faces higher technical requirements. It is necessary to ensure the stable operation of power supply circuits and electronic devices, while providing appropriate voltage and current supply to electronic devices to ensure high energy utilization.

[0003] However, many power supply circuits are designed for single application scenarios, and they are particularly inadequate in terms of different input voltage ranges or output power requirements. They are difficult to meet the comprehensive needs of multiple application scenarios, which limits their reliability and practicality. There are still many technical bottlenecks, and further optimization and improvement are urgently needed. Utility Model Content

[0004] This application provides a power supply circuit and a portable oxygen concentrator that can meet the energy supply needs in various scenarios, ensure the stable operation of the power supply circuit and electronic equipment, provide appropriate voltage and current supply to the electronic equipment, ensure high energy utilization, improve reliability and practicality, and optimize the user experience.

[0005] To solve the above-mentioned technical problems, the first aspect of this application provides a power supply circuit.

[0006] The power supply circuit is used to connect to the load and includes:

[0007] An interface circuit is used to connect to a first power source; a switching circuit is connected to the interface circuit and is also used to connect to a second power source.

[0008] The control circuit is connected to the switching circuit, the interface circuit, and the second power supply respectively. The control circuit is used to control the switching circuit to switch between the interface circuit and the second power supply.

[0009] The boost circuit is connected to the switching circuit.

[0010] The drive circuit is connected between the boost circuit and the load. The drive circuit is used to convert the DC output voltage of the boost circuit into the AC operating voltage.

[0011] The boost circuit includes a first energy storage inductor, a first power transistor, and a second power transistor. The input terminal of the first energy storage inductor is connected to the switching circuit, and the output terminal of the first energy storage inductor is connected to the input terminals of the first power transistor and the second power transistor, respectively. The output terminals of the first power transistor and the second power transistor are respectively connected to the load, and the control terminals of the first power transistor and the second power transistor are respectively connected to the control circuit.

[0012] The boost circuit also includes a sampling resistor; the output of the sampling resistor is connected to the control circuit, the input of the sampling resistor is connected to the output of the first power transistor, and the input of the sampling resistor is also used to connect to the load.

[0013] The power supply circuit includes a filter circuit connected between the interface circuit and the switch circuit; and / or, the power supply circuit includes a soft-start circuit connected between the interface circuit and the switch circuit.

[0014] The power supply circuit includes a filter circuit and a soft-start circuit. The filter circuit is connected between the interface circuit and the soft-start circuit, and the soft-start circuit is also connected to the switching circuit.

[0015] The soft-start circuit includes an overvoltage protection diode, a reverse-biased power transistor, a soft-start resistor, and a soft-start switch. The input of the overvoltage protection diode is connected to the interface circuit, and its output is grounded. The input of the reverse-biased power transistor is connected to the interface circuit, and its output is connected to the input of the soft-start switch. The output of the soft-start switch is connected to the load. The input of the soft-start resistor is connected between the output of the reverse-biased power transistor and the input of the soft-start switch, and its output is connected to the load.

[0016] The switching circuit includes a first switch and a second switch; the input terminal of the first switch is connected to the interface circuit, and the output terminal of the first switch is connected to the boost circuit; the input terminal of the second switch is used to connect to the second power supply, and the output terminal of the second switch is connected to the boost circuit; the control terminals of the first switch and the second switch are respectively connected to the control circuit.

[0017] The control circuit includes a control chip connected to a switching circuit; the control circuit also includes a voltage feedback circuit connected to the interface circuit, the second power supply, and the control chip, and the voltage feedback circuit is used to sample the input voltage of the interface circuit and the voltage of the second power supply; and / or, the control circuit also includes a current feedback circuit connected to the boost circuit, the second power supply, and the control chip, and the current feedback circuit is used to sample the output current of the boost circuit and the output current of the second power supply.

[0018] The power supply circuit also includes a power charging circuit, which is connected between the boost circuit and the second power supply. The power charging circuit is also connected to the control circuit and is used to charge the second power supply.

[0019] The power charging circuit includes a third power transistor, a second energy storage inductor, and a fourth power transistor. The input terminal of the third power transistor is connected to the boost circuit, and the output terminal of the third power transistor is connected to the input terminal of the second energy storage inductor. The output terminal of the second energy storage inductor is connected to the second power supply. The input terminal of the fourth power transistor is connected to the output terminal of the third power transistor, and the output terminal of the fourth power transistor is used for grounding. The control terminals of the third and fourth power transistors are also connected to the control circuit.

[0020] The driving circuit includes a first driving power transistor, a second driving power transistor, a first sampling driving resistor, a third driving power transistor, a fourth driving power transistor, a second sampling driving resistor R4, a fifth driving power transistor, a sixth driving power transistor, and a third sampling driving resistor. The control circuit is connected to the first sampling driving resistor, the second sampling driving resistor R4, and the third sampling driving resistor, and is also connected to the control terminals of the first, second, third, fourth, fifth, and sixth driving power transistors. The input terminal of the first driving power transistor is connected to the boost circuit, and its output terminal is connected to the input terminal of the second driving power transistor. The output terminal of the first driving power transistor is also used to connect to the load. The output terminal of the second driving power transistor is connected to the input terminal of the first sampling driving resistor. The input terminal is also used to connect to the load; the output terminal of the first sampling drive resistor is used to ground; the input terminal of the third driving power transistor is connected to the boost circuit, and the output terminal of the third driving power transistor is connected to the input terminal of the fourth driving power transistor, and the output terminal of the third driving power transistor is also used to connect to the load; the output terminal of the fourth driving power transistor is connected to the input terminal of the second sampling drive resistor R4, and the input terminal of the fourth driving power transistor is also used to connect to the load; the output terminal of the second sampling drive resistor R4 is used to ground; the input terminal of the fifth driving power transistor is connected to the boost circuit, and the output terminal of the fifth driving power transistor is connected to the input terminal of the sixth driving power transistor, and the output terminal of the fifth driving power transistor is also used to connect to the load; the output terminal of the sixth driving power transistor is connected to the input terminal of the third sampling drive resistor, and the input terminal of the sixth driving power transistor is also used to connect to the load, and the output terminal of the third sampling drive resistor is used to ground.

[0021] The power supply circuit includes an auxiliary power supply circuit, which is connected to the control circuit. The auxiliary power supply circuit is also connected to at least one of a boost circuit, an interface circuit, and a second power supply. The auxiliary power supply is used to supply power to the control circuit.

[0022] The second aspect of this application provides a portable oxygen generator.

[0023] The portable oxygen concentrator includes: a compressor; and a power supply circuit as described above, wherein the power supply circuit is connected to the compressor.

[0024] Unlike existing technologies, this application provides a power supply circuit and a portable oxygen concentrator that can accept a wide input voltage range and adapt to different models of AC and DC adapters. During use, the control circuit switches the circuit to automatically and quickly switch between external power supply input through the interface circuit and power discharge input, ensuring that the output does not drop. This maximizes the use of the adapter and enables it to adapt to different types of external power supply voltages, effectively reducing energy loss, meeting the power supply needs of long-term use and diverse application scenarios, and improving environmental adaptability and reliability. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the first embodiment of the power supply circuit of this application;

[0026] Figure 2 This is a schematic diagram of a second embodiment of the boost circuit in the power supply circuit of this application.

[0027] Figure 3 This is a schematic diagram of another embodiment of the boost circuit in the second embodiment of the power supply circuit of this application;

[0028] Figure 4 This is a schematic diagram of another embodiment of the boost circuit in the second embodiment of the power supply circuit of this application;

[0029] Figure 5 This is a schematic diagram of the filter circuit in a third embodiment of the power supply circuit of this application;

[0030] Figure 6 This is a schematic diagram of the soft-start circuit of another embodiment of the third embodiment of the power supply circuit of this application;

[0031] Figure 7 This is a partial structural schematic diagram of yet another embodiment of the power supply circuit of the present application;

[0032] Figure 8 This is a partial structural schematic diagram of one embodiment of the fourth implementation of the power supply circuit of this application.

[0033] Figure 9 This is a schematic diagram of the control circuit of the fifth embodiment of the power supply circuit of this application;

[0034] Figure 10 This is a schematic diagram of the fifth embodiment of the power supply circuit of this application;

[0035] Figure 11 This is a schematic diagram of the battery charging circuit in the fifth embodiment of the power supply circuit of this application;

[0036] Figure 12 This is a schematic diagram of the drive circuit in the fifth embodiment of the power supply circuit of this application;

[0037] Figure 13 This is a schematic diagram of one embodiment of the portable oxygen concentrator of this application. Detailed Implementation

[0038] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0039] 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.

[0040] In this article, the term "and / or" simply describes the relationship between related objects. There are three possible relationships: for example, A and / or B can exist in three ways: A alone, both A and B exist simultaneously, or B alone. Additionally, the character " / " in this article generally indicates an "or" relationship between the objects before and after it.

[0041] All power circuit diagrams and portable oxygen concentrator diagrams in this application are circuit logic illustrations; the specific connection structures are based on the actual production structures. In the following description, specific details such as particular system structures, interfaces, and technologies are presented for illustrative purposes rather than limiting, in order to provide a thorough understanding of this application.

[0042] The first aspect of this application provides a power supply circuit. This power supply circuit can be connected to the load of an electronic device to provide power. In some embodiments, the power supply circuit can be built into the electronic device or connected to the electronic device as a detachable module. Besides providing power to the load, the power supply circuit can also provide energy to other circuits or components in the electronic device.

[0043] Please see Figure 1 , Figure 1 This is a schematic diagram of the first embodiment of the power supply circuit of this application.

[0044] The power supply circuit 110 is used to connect to the load 105. The power supply circuit 110 includes: an interface circuit 101, a switching circuit, a control circuit, a boost circuit, and a drive circuit. The interface circuit 101 is used to connect to a first power supply 130; the switching circuit is connected to the interface circuit and is also used to connect to a second power supply; the control circuit is connected to the switching circuit, the interface circuit, and the second power supply respectively, and is used to control the switching circuit to switch between the interface circuit and the second power supply; the boost circuit is connected to the switching circuit; and the drive circuit is connected between the boost circuit and the load, and is used to convert the DC output voltage of the boost circuit into an AC operating voltage.

[0045] The interface circuit 101 may be equipped with multiple interfaces, including USB (Universal Serial Bus), two-prong plug or three-prong plug. The first power supply 130 may be an external power supply powered by DC or AC. The interface circuit 101 may be equipped with an AC-DC conversion circuit to assist in converting the DC power required by the power supply circuit 110.

[0046] In some embodiments, the interface circuit 101 can adapt to a wide range of external power supply voltages from 10V to 29V, such as 10V, 12V, 12.5V, 15V, 10V, 15V, and 29V. In one specific embodiment, the interface circuit 101 includes a USB (Universal Serial Bus) interface, which can be connected to external power supplies with voltages of 5V, 9V, 12V, and 15V, meeting the needs of various application scenarios such as homes, medical facilities, industrial sites, educational institutions, outdoor power supplies, or vehicle cigarette lighters.

[0047] The second power source 140 can be a battery that can be removably installed in an electronic device or a battery that is fixedly installed in an electronic device. The battery can be a non-rechargeable primary battery, such as an alkaline battery, a carbon battery, or a lithium primary battery, or a rechargeable battery, such as a lithium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, or a lithium iron phosphate battery.

[0048] When the interface circuit 101 is not connected to the first power supply 130 for power supply, it will be powered by the second power supply 140 connected to the power supply circuit 110 to meet the power supply requirements of the load 105. When the first power supply 130 is plugged into the interface circuit 101, it receives the electrical signal transmitted by the interface circuit 101. The control circuit 103 will generate a control signal to the switch circuit 102 to control the switch circuit 102 to turn on one of the switches connected to the interface circuit 101, and use the voltage input from the first power supply 130 to power the load 105.

[0049] In order to meet the operating voltage of the load 105 under various power supply scenarios, the voltage input from the first power supply 130 or the second power supply 140 needs to be boosted by the boost circuit 104. In some embodiments, the control circuit 103 can also be connected to the boost circuit 104 to control the on or off of the components in the boost circuit 104 to achieve different boost modes and meet the power supply requirements of the load 105.

[0050] In some embodiments, the boost circuit 104 is a DC boost circuit that converts a wide range of DC voltages into the operating voltage of the load 105. The voltage output by the interface circuit 101 connected to the first power supply 130 or the voltage input by the second power supply 140 is connected to the input terminal of the boost circuit 104 via the switching circuit 102.

[0051] In some embodiments, the load 105 connected to the drive circuit 106 receives a pulse width modulation command from the control circuit 103 to control the turn-on and turn-off of the drive power transistors of each branch, and converts the DC voltage into a three-phase AC voltage with adjustable voltage and frequency to power the load.

[0052] In other embodiments, a power charging circuit (not shown) can be provided to supply power to the second power supply 140 when the interface circuit 101 is connected to the first power supply 130. Alternatively, a protection circuit can be provided, which can be located between the interface circuit 101 and the boost circuit 104, or between the boost circuit 104 and the load 105, to prevent the power supply circuit 110 or the load 105 from being affected by overcurrent or overvoltage, thereby improving circuit reliability.

[0053] Figure 2 This is a schematic diagram of a boost circuit according to a second embodiment of the power supply circuit of this application.

[0054] In one optional embodiment, the boost circuit 104 includes: a first energy storage inductor 501, a first power transistor 502, and a second power transistor 503. The input terminal of the first energy storage inductor 501 is connected to the switching circuit 102, and the output terminal of the first energy storage inductor 501 is connected to the input terminals of the first power transistor 502 and the second power transistor 503, respectively. The output terminals of the first power transistor 502 and the second power transistor 503 are respectively connected to the load 105, and the control terminals of the first power transistor 502 and the second power transistor 503 are respectively connected to the control circuit 103.

[0055] In some embodiments, the first power transistor 502 and the second power transistor 503 are metal-oxide-semiconductor field-effect transistors. Using the second power transistor 503 to turn on the boost circuit 104 can effectively reduce conduction losses compared to using a diode.

[0056] When the control circuit 103 samples that the voltage output by the interface circuit 101 is greater than the rated voltage of the load 105 but less than the overvoltage protection value, the boost circuit 104 does not work and directly supplies power to the compressor 1051. At this time, the first power transistor 502 is always off. Alternatively, when the voltage input to the interface circuit 101 is higher than the overvoltage protection value, a control signal for protecting the boost circuit 104 is input, disconnecting the boost circuit 104 from the interface circuit 101.

[0057] When powered by the second power supply 140, the interface circuit 101 is disconnected from the first power supply 130 to ensure that there is no voltage input to the interface circuit 101, preventing electric shock or short circuit. When the second power supply 140 is switched on, the control circuit 103 can sample the voltage of the second power supply 140 and automatically boost the voltage to the rated drive voltage of the load 105. When the second power supply 140 discharges to the undervoltage point, the boost circuit 104 is turned off to prevent the second power supply 140 from continuing to discharge and protect the life of the second power supply 140.

[0058] Figure 3 This is a schematic diagram of another embodiment of the boost circuit in the second embodiment of the power supply circuit of this application.

[0059] In an optional embodiment, the boost circuit 104 further includes a sampling resistor 504; the output terminal of the sampling resistor 504 is connected to the control circuit 103, the input terminal of the sampling resistor 504 is connected to the output terminal of the first power transistor 502, and the input terminal of the sampling resistor 504 is also used to connect to the load 105.

[0060] The control circuit 103 is connected to the sampling resistor 504, the first power transistor 502, and the second power transistor 503. The control circuit 103 samples the electrical signal from its sampling resistor 504, generates a control signal, and turns on the first power transistor 502 and the second power transistor 503. The boost circuit 104 then boosts the voltage to the operating voltage of the load 501. The control circuit 103 can also sample the current of the boost circuit 104 and the output voltage of the boost circuit 104 through the sampling resistor 504, achieving dual closed-loop control of the voltage and current of the boost circuit 104. This reduces the output voltage ripple of the boost circuit 104 and improves dynamic response speed and voltage stability.

[0061] Please refer to Figure 4 , Figure 4 This is a schematic diagram of another embodiment of the boost circuit in the second embodiment of the power supply circuit of this application.

[0062] In one specific embodiment, the boost circuit 104 includes: a first energy storage inductor L1, a sampling resistor R1, a first power transistor S1, and a second power transistor S2; the first power transistor S1 and the second power transistor S2 are metal-oxide-semiconductor field-effect transistors, the first energy storage inductor L1 and the second power transistor S2 are disposed on the positive bus (not shown in the figure) of the boost circuit 104, the sampling resistor R1 is disposed on the negative bus (not shown in the figure) of the boost circuit 104, the source of the first power transistor S1 is connected to the first energy storage inductor L1 and the second power transistor S2, and the drain is connected to the sampling resistor R1, bridging the positive bus and the negative bus.

[0063] In one alternative embodiment, the power supply circuit 110 includes a filter circuit 107 connected between the interface circuit 101 and the switch circuit 102; and / or, the power supply circuit 110 includes a soft-start circuit 108 connected between the interface circuit 101 and the switch circuit 102.

[0064] In some embodiments, please refer to Figure 5 , Figure 5 This is a schematic diagram of the filter circuit in the third embodiment of the power supply circuit of this application.

[0065] The filter circuit 107 can perform common-mode filtering and differential-mode filtering to meet the medical power supply CLASS B EMC standard. The filter circuit 107 includes a common-mode filter circuit 601 and a differential-mode filter circuit 602 connected to each other. The EMC filter module includes common-mode filter capacitors LCM1, CX1 and CX2 and differential-mode filter capacitors LDM2, CD and CD2, which perform common-mode filtering, so that the voltage input to the interface circuit 101 meets the medical power supply CLASS B EMC standard.

[0066] In some embodiments, the soft-start circuit 108 includes an overvoltage protection diode, a reverse power transistor, a soft-start resistor, and a soft-start switch. The input terminal of the overvoltage protection diode is connected to the interface circuit 101, and the output terminal of the overvoltage protection diode is grounded. The input terminal of the reverse power transistor is connected to the interface circuit 101, and the output terminal of the reverse power transistor is connected to the input terminal of the soft-start switch. The output terminal of the soft-start switch is connected to the load 105. The input terminal of the soft-start resistor is connected between the output terminal of the reverse power transistor and the input terminal of the soft-start switch, and the output terminal of the soft-start resistor is connected to the load 105.

[0067] Please refer to Figure 6 , Figure 6 This is a schematic diagram of the soft-start circuit of another embodiment of the third implementation of the power supply circuit of this application.

[0068] The soft-start circuit 108 includes an overvoltage protection diode TVS1, a soft-start resistor RT1, a soft-start switch QS2, and a reverse-voltage protection transistor QS1. When an overvoltage occurs, the overvoltage protection diode TVS1 will change its high impedance to low impedance in a very short time, while simultaneously absorbing a large current and clamping the voltage to a safe level. The reverse-voltage protection transistor QS1 and the soft-start switch QS2 are metal-oxide-semiconductor field-effect transistors. The reverse-voltage protection transistor QS1 uses unidirectional conductivity to achieve reverse connection protection, while the soft-start switch QS2 uses the characteristic of a switch that can gradually turn on to achieve soft-start overcurrent protection.

[0069] Please see Figure 7 , Figure 7 This is a partial structural schematic diagram of yet another embodiment of the third implementation of the power supply circuit of this application.

[0070] In one alternative embodiment, the power supply circuit 110 includes a filter circuit 107 and a soft-start circuit 108. The filter circuit 107 is connected between the interface circuit 101 and the soft-start circuit 108, and the soft-start circuit 108 is also connected to the switch circuit 102.

[0071] The filter circuit 107 can provide a more stable input voltage for the soft-start circuit 108, enabling the soft-start circuit 108 to work more effectively.

[0072] Please see Figure 8 , Figure 8 This is a partial structural schematic diagram of one embodiment of the fourth implementation of the power supply circuit of this application.

[0073] In one optional embodiment, the switching circuit 102 includes a first switch 201 and a second switch 202; the input terminal of the first switch 201 is connected to the interface circuit 101, and the output terminal of the first switch 201 is connected to the boost circuit 104; the input terminal of the second switch 202 is used to connect to the second power supply 140, and the output terminal of the second switch 202 is connected to the boost circuit 104; the control terminals of the first switch 201 and the second switch 202 are respectively connected to the control circuit 103.

[0074] The control circuit 103 turns on the corresponding switch and turns off the other switch based on the power supply signal from the interface circuit 101 or the second power supply 140, thereby switching the power supply.

[0075] Please see Figure 9 , Figure 9 This is a schematic diagram of the control circuit in the fifth embodiment of the power supply circuit of this application.

[0076] In an optional embodiment, the control circuit 103 includes a control chip 401, which is connected to the switching circuit 102. The control chip 401 can receive electrical signals from various circuits in the power supply circuit 110, as well as the first power supply 130 or the second power supply 140, to dynamically adjust the power supply to the load 105.

[0077] The control circuit 103 also includes a voltage feedback circuit 402, which is connected to the interface circuit 101, the second power supply 140 and the control chip 401 respectively. The voltage feedback circuit 402 is used to sample the input voltage of the interface circuit 101 and the voltage of the second power supply 140.

[0078] And / or, the control circuit 103 also includes a current feedback circuit 403, which is connected to the boost circuit 104, the second power supply 140 and the control chip 401 respectively. The current feedback circuit 403 is used to sample the output current of the boost circuit 104 and the output current of the second power supply 140.

[0079] In one optional implementation, when the input voltage of the interface circuit 101 is greater than the rated operating voltage of the load 105 and less than the overvoltage protection value, the voltage feedback circuit 402 samples the voltage of the interface circuit 101, generates a feedback signal, and sends it to the control chip 401 to generate a control signal, which turns off the first power transistor 502 of the boost circuit 104 and turns on the second power transistor 503, so that the input voltage of the interface circuit 101 directly supplies power to the compressor 1051.

[0080] When the input voltage of the interface circuit 101 is higher than the overvoltage protection value, the voltage feedback signal is sampled by the voltage feedback circuit 402, which generates a feedback signal and sends it to the control chip 401 to generate a control signal to the switch circuit 102, causing the first switch 201 connected to the interface circuit 101 to disconnect.

[0081] When the voltage of the second power supply 140 drops to the undervoltage point, the voltage feedback circuit 402 samples the battery voltage and generates a feedback signal to the switching circuit 102, causing the second switch 202 to open.

[0082] Please see Figure 10 , Figure 10 This is a schematic diagram of the sixth embodiment of the power supply circuit of this application.

[0083] In an optional embodiment, the power supply circuit 110 further includes a power charging circuit 109 connected between the boost circuit 104 and the second power supply 140. The power charging circuit 109 is also connected to the control circuit 103 and is used to charge the second power supply 140.

[0084] The boosted DC voltage after the boost circuit 104 needs to be stepped down by the power charging circuit to charge the second power supply 140. When the first power supply 130 is connected to the interface circuit 101 and the second power supply 140 is low on power, the power charging circuit 109 can be turned on to charge the second power supply 140. When the voltage of the second power supply 140 reaches the voltage at which the second power supply 140 is fully charged, the power charging circuit 109 can be turned off.

[0085] In one optional embodiment, the power charging circuit 109 includes a third power transistor, a second energy storage inductor, and a fourth power transistor; the input terminal of the third power transistor is connected to the boost circuit 104, and the output terminal of the third power transistor is connected to the input terminal of the second energy storage inductor; the output terminal of the second energy storage inductor is connected to the second power supply 140; the input terminal of the fourth power transistor is connected to the output terminal of the third power transistor, and the output terminal of the fourth power transistor is used for grounding; the control terminals of the third power transistor and the fourth power transistor are also respectively connected to the control circuit 103.

[0086] Please see Figure 11 , Figure 11 This is a schematic diagram of the battery charging circuit in the fifth embodiment of the power supply circuit of this application.

[0087] The power charging circuit 109 includes a second energy storage inductor L2, a third power transistor S3, and a fourth power transistor S4. Compared to a diode, using the fourth power transistor S4 can reduce conduction losses and improve the voltage conversion efficiency of the power charging circuit 109.

[0088] In some embodiments, the control circuit 103 samples the current of the battery charging circuit through the current sampling resistor R2 and generates a control signal for constant current charging control. In other embodiments, the battery charging circuit or the control circuit 103 can sample the current voltage of the second power supply 140. Based on the voltage of the second power supply 140, the control circuit 103 controls the fourth power transistor S4 to make the charging circuit operate in constant current charging mode or constant voltage charging mode. When the battery reaches the voltage representing a full charge, and the charging current is less than the cutoff current, the battery charging circuit is turned off.

[0089] Please see Figure 12 , Figure 12 This is a schematic diagram of the drive circuit in the fifth embodiment of the power supply circuit of this application.

[0090] In one optional embodiment, the driving circuit 106 includes a first driving power transistor S5, a second driving power transistor S6, a first sampling driving resistor R3, a third driving power transistor S7, a fourth driving power transistor S8, a second sampling driving resistor R4, a fifth driving power transistor S9, a sixth driving power transistor S10, and a third sampling driving resistor R5; the control circuit 103 is connected to the first sampling driving resistor R3, the second sampling driving resistor R4, and the third sampling driving resistor R5 respectively, and the control circuit 103 is also connected to the control terminals of the first driving power transistor S5, the second driving power transistor S6, the third driving power transistor S7, the fourth driving power transistor S8, the fifth driving power transistor S9, and the sixth driving power transistor S10 respectively; the input terminal of the first driving power transistor S5 is connected to the boost circuit 104, the output terminal of the first driving power transistor S5 is connected to the input terminal of the second driving power transistor S6, and the output terminal of the first driving power transistor S5 is also used to connect to the load 105; the output terminal of the second driving power transistor S6 is connected to the input terminal of the first sampling driving resistor R3, the second... The input terminal of the driving power transistor S6 is also used to connect to the load 105; the output terminal of the first sampling driving resistor R3 is used to ground; the input terminal of the third driving power transistor S7 is connected to the boost circuit 104, and the output terminal of the third driving power transistor S7 is connected to the input terminal of the fourth driving power transistor S8, and the output terminal of the third driving power transistor S7 is also used to connect to the load 105; the output terminal of the fourth driving power transistor S8 is connected to the input terminal of the second sampling driving resistor R4, and the input terminal of the fourth driving power transistor S8 is also used to connect to the load 105; the output terminal of the second sampling driving resistor R4 is used to ground; the input terminal of the fifth driving power transistor S9 is connected to the boost circuit 104, and the output terminal of the fifth driving power transistor S9 is connected to the input terminal of the sixth driving power transistor S10, and the output terminal of the fifth driving power transistor S9 is also used to connect to the load 105; the output terminal of the sixth driving power transistor S10 is connected to the input terminal of the third sampling driving resistor R5, and the input terminal of the sixth driving power transistor S10 is also used to connect to the load 105; the output terminal of the third sampling driving resistor R5 is used to ground.

[0091] In some embodiments, the load 105 connected to the drive circuit 106 is a motor. Receiving pulse width modulation commands from the control circuit 103, it controls the switching on and off of the drive power transistors in each branch, converting the DC voltage into a three-phase AC voltage with adjustable voltage and frequency to drive the brushless DC motor within the compressor 1051. The control circuit 103 samples the current in the circuit through the first sampling drive resistor R3, the second sampling drive resistor R4, and the third sampling drive resistor R5, and uses a sensorless estimation algorithm installed on the motor to decompose information such as the three-phase output current and output frequency, outputting control signals to the load 105 for closed-loop control of the load 105. In some embodiments, the control circuit 103 outputs control signals according to a given rotational speed to cause the power supply to output a motor drive voltage of the corresponding frequency.

[0092] In one alternative embodiment, the power supply circuit 110 includes an auxiliary power supply circuit 1010, which is connected to the control circuit 103. The auxiliary power supply circuit 1010 is also connected to at least one of the boost circuit 104, the interface circuit 101, and the second power supply 140. The auxiliary power supply is used to supply power to the control circuit 103.

[0093] The auxiliary power supply circuit 1010 can utilize at least one of three voltage sources: DC input from the interface circuit 101, output from the boost circuit 104, or voltage from the second power supply 140. The control circuit 103 controls the circuits connected to the auxiliary power supply circuit 1010 and the corresponding voltage source based on the three connection methods, and converts the voltage to a suitable level for the operation of the control circuit 103 to power the control circuit 103.

[0094] The second aspect of this application provides a portable oxygen concentrator 120, which is connected to or has a built-in power circuit 110 to provide power for the operation of the compressor 1051 in various usage scenarios, thereby achieving the effect of being easy to carry and applicable in multiple scenarios.

[0095] Please see Figure 13 Figure 13 This is a schematic diagram of one embodiment of the portable oxygen concentrator of this application.

[0096] The portable oxygen concentrator 120 includes: a compressor 1051; and a power supply circuit 110 as described above, wherein the power supply circuit 110 is connected to the compressor 1051.

[0097] In one alternative implementation, the power circuit 110 can be connected to the compressor 1051 in the oxygen concentrator to provide it with power. The compressor 1051 compresses the air to a certain pressure to supply oxygen to the user. In some embodiments, the power circuit 110 can be built into the oxygen concentrator or connected to the oxygen concentrator as a detachable module. In addition to providing power to the compressor 1051, the power circuit 110 can also provide energy to other circuits or components in the connected oxygen concentrator.

[0098] In one optional embodiment, the power supply circuit 110 is connected to the compressor 1051. The control circuit 103 samples the current in the circuit through the first sampling drive resistor 504R3, the second sampling drive resistor 504R4, and the third sampling drive resistor 504R5, respectively. It then uses a sensorless estimation algorithm installed on the compressor 1051 to decompose information such as the three-phase output current and output frequency, and outputs a control signal to the load 105 to perform closed-loop control on the load 105. In some embodiments, the control circuit 103 outputs a control signal according to a given rotational speed to cause the power supply to output a compressor 1051 drive voltage at a corresponding frequency.

[0099] In some embodiments, the control circuit 103 adjusts the battery charging power according to the oxygen flow rate set by the oxygen concentrator. When the oxygen concentrator operates in low oxygen flow mode or standby mode, the battery charging circuit charges the battery at rated power to increase the charging speed. When the oxygen concentrator operates in high oxygen flow mode, the battery charging circuit adjusts the charging power according to different oxygen flow rates, i.e., the power of the compressor 1051, to reduce the power requirements of the interface circuit 101 and / or the AC adapter.

[0100] In one optional embodiment, the auxiliary power supply circuit 1010 is connected to the control circuit 103 and supplies power to the control circuit 103; the auxiliary power supply circuit 1010 is connected to the interface circuit 101, the output of the boost circuit 104 and / or the battery, and receives the voltage of the output of the interface circuit 101, the boost circuit 104 and / or the battery; when the control circuit 103 obtains a voltage feedback signal indicating that the compressor 1051 is in standby mode and only powered by the battery, it generates a control signal to turn on the auxiliary power supply circuit 1010.

[0101] The auxiliary power supply circuit 1010 can utilize voltages from three sources: DC input, boost circuit 104 output, and battery. The control circuit 103 generates control signals based on the voltage levels of these three sources, activating the circuits of the auxiliary power supply circuit 1010 and the corresponding voltage sources, and converting the voltage to a suitable level for the control circuit 103's operation, thus powering the control circuit 103. When the start switch is pressed, the control circuit 103, upon receiving information indicating that only battery power is available and the compressor 1051 is not required for oxygen production, sends a control signal to activate only the pathway between the battery, auxiliary power supply circuit 1010, and control circuit 103, minimizing battery power loss. The circuit driving the compressor 1051 is activated only when the oxygen concentrator begins operation.

[0102] Unlike existing technologies, this application provides a power supply circuit and a portable oxygen concentrator that can accept a wide input voltage range and adapt to different types of AC-DC adapters. During use, through dynamic adjustment of the control circuit, it can automatically and quickly switch between receiving power from the first power input via the interface circuit or discharging through the second power input, eliminating the need for an external DC adapter and ensuring uninterrupted output. This maximizes the use of the adapter and enables adaptive operation to different types of external power supply voltages. Furthermore, this application employs a control circuit to generate control signals for interactive control, enabling automatic allocation of compressor drive and battery charging power, reducing the oxygen concentrator's rated power requirement. It also allows the oxygen concentrator to adaptively adjust battery charging power and auxiliary power supply power according to oxygen production capacity, improving ease of use and meeting the power needs of long-term use and diverse application scenarios. Especially in vehicle-mounted applications with a 12V external power supply, it enhances environmental adaptability and reliability.

[0103] Unlike existing technologies, this application provides a power supply circuit and a portable oxygen concentrator that can accept a wide input voltage range and adapt to different types of AC-DC adapters. During use, the external power supply and battery discharge can automatically and quickly switch between input power and battery discharge, ensuring uninterrupted power output. It can also adaptively adjust battery charging power and auxiliary power supply power according to the oxygen production capacity, maximizing the use of the adapter. The adapter can adapt to different types of external power supply voltages, and especially in vehicle-mounted 12V external power supply conditions, it eliminates the need for an external DC adapter, improving the ease of use of the oxygen concentrator. Simultaneously, this application uses a control circuit to generate control signals for interactive control, enabling automatic allocation of compressor drive and battery charging power, reducing the rated power requirement of the oxygen concentrator, meeting the energy needs of long-term use and diverse application scenarios, and improving environmental adaptability and reliability.

[0104] In the several embodiments provided in this application, it should be understood that the disclosed systems and devices can be implemented in other ways. Regarding the technical solutions in the embodiments of this application, it is obvious that the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. For example, the device implementation methods described above are merely illustrative. For example, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be electrical, mechanical, or other forms.

[0105] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0106] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "coupled," "connected," "linked," "set up," and "installed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0107] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment, depending on actual needs.

[0108] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0109] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A power supply circuit, characterized by comprising: The power supply circuit is used to connect to a load, and the power supply circuit includes: An interface circuit, the interface circuit being used to connect to a first power supply; A switching circuit is connected to the interface circuit, and the switching circuit is also used to connect to a second power source. A control circuit is connected to the switching circuit, the interface circuit, and the second power supply respectively. The control circuit is used to control the switching circuit to switch between the interface circuit and the second power supply. A boost circuit is connected to the switching circuit. A drive circuit is connected between the boost circuit and the load, and the drive circuit is used to convert the DC output voltage of the boost circuit into the AC operating voltage.

2. The power supply circuit of claim 1, wherein The boost circuit includes: a first energy storage inductor, a first power transistor, and a second power transistor; The input terminal of the first energy storage inductor is connected to the switching circuit, and the output terminal of the first energy storage inductor is connected to the input terminal of the first power transistor and the input terminal of the second power transistor, respectively. The output terminals of the first power transistor and the second power transistor are respectively connected to the load, and the control terminals of the first power transistor and the second power transistor are respectively connected to the control circuit.

3. The power supply circuit according to claim 2, characterized in that, The boost circuit also includes a sampling resistor; The output terminal of the sampling resistor is connected to the control circuit, the input terminal of the sampling resistor is connected to the output terminal of the first power transistor, and the input terminal of the sampling resistor is also used to connect to the load.

4. The power supply circuit according to claim 1, characterized in that, The power supply circuit includes a filter circuit, which is connected between the interface circuit and the switching circuit; and / or, The power supply circuit includes a soft-start circuit, which is connected between the interface circuit and the switching circuit.

5. The power supply circuit according to claim 1, characterized in that, The power supply circuit includes a filter circuit and a soft-start circuit. The filter circuit is connected between the interface circuit and the soft-start circuit, and the soft-start circuit is also connected to the switch circuit.

6. The power supply circuit according to claim 5, characterized in that, The soft-start circuit includes an overvoltage protection diode, a reverse power transistor, a soft-start resistor, and a soft-start switch transistor. The input terminal of the overvoltage protection diode is connected to the interface circuit, and the output terminal of the overvoltage protection diode is used for grounding. The input terminal of the anti-reverse power transistor is connected to the interface circuit, and the output terminal of the anti-reverse power transistor is connected to the input terminal of the soft-start switch transistor. The output terminal of the soft-start switch is used to connect to the load. The input terminal of the soft-start resistor is connected between the output terminal of the reverse protection power transistor and the input terminal of the soft-start switch transistor, and the output terminal of the soft-start resistor is used to connect to the load.

7. The power supply circuit according to claim 1, characterized in that, The switching circuit includes a first switch and a second switch; The input terminal of the first switch is connected to the interface circuit, and the output terminal of the first switch is connected to the boost circuit. The input terminal of the second switch is used to connect to the second power supply, and the output terminal of the second switch is connected to the boost circuit; The control terminals of the first switch and the second switch are respectively connected to the control circuit.

8. The power supply circuit according to claim 1, characterized in that, The control circuit includes a control chip, which is connected to the switching circuit. The control circuit further includes a voltage feedback circuit, which is connected to the interface circuit, the second power supply, and the control chip. The voltage feedback circuit is used to sample the input voltage of the interface circuit and the voltage of the second power supply; and / or, The control circuit further includes a current feedback circuit, which is connected to the boost circuit, the second power supply, and the control chip. The current feedback circuit is used to sample the output current of the boost circuit and the output current of the second power supply.

9. The power supply circuit according to any one of claims 1-8, characterized in that, The power supply circuit also includes a power charging circuit, which is connected between the boost circuit and the second power supply. The power charging circuit is also connected to the control circuit and is used to charge the second power supply.

10. The power supply circuit according to claim 9, characterized in that, The power charging circuit includes a third power transistor, a second energy storage inductor, and a fourth power transistor. The input terminal of the third power transistor is connected to the boost circuit, and the output terminal of the third power transistor is connected to the input terminal of the second energy storage inductor. The output terminal of the second energy storage inductor is connected to the second power supply; The input terminal of the fourth power transistor is connected to the output terminal of the third power transistor, and the output terminal of the fourth power transistor is used for grounding; The control terminals of the third power transistor and the fourth power transistor are also connected to the control circuit.

11. The power supply circuit according to claim 1, characterized in that, The driving circuit includes a first driving power transistor, a second driving power transistor, a first sampling driving resistor, a third driving power transistor, a fourth driving power transistor, a second sampling driving resistor, a fifth driving power transistor, a sixth driving power transistor, and a third sampling driving resistor; the control circuit is connected to the first sampling driving resistor, the second sampling driving resistor, and the third sampling driving resistor, respectively, and the control circuit is also connected to the control terminals of the first driving power transistor, the second driving power transistor, the third driving power transistor, the fourth driving power transistor, the fifth driving power transistor, and the sixth driving power transistor, respectively. The input terminal of the first driving power transistor is connected to the boost circuit, and the output terminal of the first driving power transistor is connected to the input terminal of the second driving power transistor. The output terminal of the first driving power transistor is also used to connect to the load. The output terminal of the second driving power transistor is connected to the input terminal of the first sampling driving resistor. The input terminal of the second driving power transistor is also used to connect to the load. The output terminal of the first sampling driving resistor is used to ground. The input terminal of the third driving power transistor is connected to the boost circuit, and the output terminal of the third driving power transistor is connected to the input terminal of the fourth driving power transistor. The output terminal of the third driving power transistor is also used to connect to the load. The output terminal of the fourth driving power transistor is connected to the input terminal of the second sampling driving resistor. The input terminal of the fourth driving power transistor is also used to connect to the load. The output terminal of the second sampling driving resistor is used to ground. The input terminal of the fifth driving power transistor is connected to the boost circuit, and the output terminal of the fifth driving power transistor is connected to the input terminal of the sixth driving power transistor. The output terminal of the fifth driving power transistor is also used to connect to the load. The output terminal of the sixth driving power transistor is connected to the input terminal of the third sampling driving resistor. The input terminal of the sixth driving power transistor is also used to connect to the load, and the output terminal of the third sampling driving resistor is used to ground.

12. The power supply circuit according to any one of claims 1-8, characterized in that, The power supply circuit includes an auxiliary power supply circuit, which is connected to the control circuit. The auxiliary power supply circuit is also connected to at least one of the boost circuit, the interface circuit, and the second power supply. The auxiliary power supply is used to supply power to the control circuit.

13. A portable oxygen concentrator, characterized in that, The portable oxygen concentrator includes: compressor; The power supply circuit as described in any one of claims 1 to 12, wherein the power supply circuit is connected to the compressor.

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