Standby power supply circuit for concentrator and electronic equipment

Abstract

The invention relates to a standby power supply circuit for a concentrator and electronic equipment, and the standby power supply circuit for the concentrator comprises an isolation circuit which is connected with a main power supply, a switching circuit and a capacitor filter circuit and is used for isolating the main power supply from a standby power supply and converting the voltage of the main power supply into a first voltage; the switching circuit is connected with the standby power supply, the isolation circuit and the capacitor filter circuit, and is used for being switched off or switched on based on the power supply state of the main power supply; the standby power supply is connected with the switching circuit and is used for charging or discharging based on the switching state of the switching circuit; and the capacitor filter circuit is used for outputting a voltage for supplying power to the concentrator based on the first voltage or the discharge voltage of the standby power supply. The standby power supply circuit for the concentrator is simple and reliable in structure, convenient to use and capable of preventing negative effects caused by the fact that the concentrator does not work due to mains supply outage.

Description

Technical Field

[0001] This application relates to the field of circuit technology, and more specifically to a backup power supply circuit and electronic equipment for a concentrator. Background Technology

[0002] A concentrator is an IoT data acquisition and transmission device based on mobile communication technology. It is mainly used to centrally manage and process data from distributed terminal devices (such as sensors, meters, controllers, etc.), and upload the data to a cloud platform or monitoring center via the network. It can also receive control commands from the platform to achieve remote control of the terminal devices.

[0003] Smart meters are one application scenario for concentrators. In residential life, water meters, electricity meters, gas meters, etc., all require regular meter reading. Currently, there are two main meter reading solutions on the market. One is to use manual meter readers for on-site meter reading, which is labor-intensive and inefficient. The other solution is to use wireless communication technology to achieve wireless meter reading. This method uses a concentrator, but concentrators currently only have a single power supply. During the operation of the concentrator, when the mains power is interrupted or the power grid fluctuates, the concentrator cannot work, which greatly affects the data transmission of meter reading data. Summary of the Invention

[0004] This application is made to address the aforementioned problems. According to one aspect of this application, a backup power supply circuit for a concentrator is provided, the backup power supply circuit for the concentrator comprising: An isolation circuit, connected to the main power supply, switching circuit, and capacitor filter circuit, is used to isolate the main power supply from the backup power supply and convert the main power supply voltage into a first voltage. The switching circuit is connected to the backup power supply, the isolation circuit, and the capacitor filter circuit, and is used to turn off or on based on the power supply status of the main power supply. The backup power supply is connected to the switching circuit and is used to charge or discharge based on the switching state of the switching circuit. The capacitor filter circuit is used to output a voltage to power the concentrator based on the first voltage or the discharge voltage of the backup power supply.

[0005] In one embodiment of this application, the power supply state of the main power supply includes a non-power-off state and a power-off state, wherein: When the main power supply is in the non-power-off state, the switching circuit is turned off, the backup power supply charges itself based on the first voltage, and the capacitor filter circuit outputs the voltage to supply power to the concentrator based on the first voltage. When the main power supply is in the power-off state, the switching circuit is turned on, and the backup power supply is connected to the capacitor filter circuit via the switching circuit. The capacitor filter circuit outputs a voltage to supply power to the concentrator based on the discharge voltage of the backup power supply.

[0006] In one embodiment of this application, the isolation circuit includes: A first diode, the anode of which is connected to the main power supply, and the cathode of which is connected to the anode of a second diode; The second diode, the cathode of which is connected to the switching circuit and the capacitor filter circuit; The third diode has its anode connected to the main power supply and its cathode connected to the switching circuit.

[0007] In one embodiment of this application, the first diode and the second diode are step-down isolation diodes.

[0008] In one embodiment of this application, the switching circuit includes: The first transistor has its gate connected to the first terminal of the first resistor, its drain connected to the backup power supply, and its source connected to the source of the second transistor. The second transistor has its gate connected to the first terminal of the first resistor, and its drain connected to the isolation circuit and the capacitor filter circuit. The first resistor has its second terminal grounded.

[0009] In one embodiment of this application, both the first transistor and the second transistor are PMOS transistors.

[0010] In one embodiment of this application, the capacitor filter circuit includes: A first capacitor, the first terminal of the first capacitor is connected to the isolation circuit and the switching circuit, and the second terminal of the first capacitor is grounded; The second capacitor has its first terminal connected to the first terminal of the first capacitor, and its second terminal grounded. The third capacitor has its first terminal connected to the first terminal of the second capacitor, and its second terminal grounded.

[0011] In one embodiment of this application, the backup power supply includes: A lithium battery, wherein the positive terminal of the lithium battery is connected to the switching circuit, and the negative terminal of the lithium battery is grounded.

[0012] In one embodiment of this application, the backup power circuit is suitable for a 4G concentrator.

[0013] According to another aspect of this application, an electronic device is also provided, which includes the above-described backup power supply circuit for a concentrator.

[0014] In one embodiment of this application, the electronic device further includes a main power supply connected to an isolation circuit of the backup power supply circuit.

[0015] In one embodiment of this application, the electronic device is a power supply or a concentrator.

[0016] The backup power supply circuit for the concentrator according to the embodiments of this application has a simple and reliable structure and is easy to use. When the main power supply fails, the backup power supply can supply power to the concentrator in a timely manner. Compared with the traditional single power supply system of the concentrator, this application can realize dual power supply and prevent the negative impact of the concentrator not working due to the failure of the mains power. Attached Figure Description

[0017] The above and other objects, features, and advantages of this application will become more apparent from the more detailed description of the embodiments of this application in conjunction with the accompanying drawings. The accompanying drawings are used to provide a further understanding of the embodiments of this application and form part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof. In the accompanying drawings, the same reference numerals generally represent the same components or steps.

[0018] Figure 1 A schematic structural block diagram of a backup power supply circuit for a concentrator according to an embodiment of this application is shown.

[0019] Figure 2 An exemplary circuit diagram of a backup power supply circuit for a concentrator according to an embodiment of this application is provided.

[0020] Figure 3 An overall operational framework diagram of a backup power supply circuit for a concentrator according to an embodiment of this application is shown. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this application more apparent, exemplary embodiments according to this application will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are merely a part of the embodiments of this application, and not all of the embodiments of this application. It should be understood that this application is not limited to the exemplary embodiments described herein. Based on the embodiments of this application described herein, all other embodiments obtained by those skilled in the art without inventive effort should fall within the protection scope of this application.

[0022] Figure 1A schematic structural block diagram of a backup power supply circuit 1 for a concentrator according to an embodiment of this application is shown. Figure 1 As shown, the backup power supply circuit 1 for the concentrator includes an isolation circuit 11, a switching circuit 12, a backup power supply 13, and a capacitor filter circuit 14. The isolation circuit 11, connected to the main power supply, the switching circuit 12, and the capacitor filter circuit 14, isolates the main power supply from the backup power supply 13 and converts the main power supply voltage to a first voltage. The switching circuit 12, connected to the backup power supply 13, the isolation circuit 11, and the capacitor filter circuit 14, is used to turn the main power supply off or on based on its power supply status. The backup power supply 13, connected to the switching circuit 12, is used to charge or discharge based on the switching state of the switching circuit 12. The capacitor filter circuit 14 outputs a voltage to power the concentrator based on the first voltage or the discharge voltage of the backup power supply 13.

[0023] In the embodiments of this application, a backup power supply circuit 1 for a concentrator is provided. Its structure is simple, including an isolation circuit 11, a switching circuit 12, a backup power supply 13, and a capacitor filter circuit 14. The isolation circuit 11 is connected to the main power supply and can convert the voltage of the main power supply into a voltage suitable for supplying the concentrator. The main power supply can be a converted AC power supply. The isolation circuit 11 is also connected to the capacitor filter circuit 14. When the main power supply is operating normally and without power failure, the voltage converted by the isolation circuit 11, after passing through the capacitor filter circuit 14, provides a more stable output voltage for supplying power to the concentrator. The switching circuit 12 is connected to the isolation circuit 11. When the power supply state of the main power supply changes, the output voltage of the isolation circuit 11 changes accordingly, and the switching state of the switching circuit 12 also changes accordingly. The switching circuit 12 is connected to the backup power supply 13. When the switching state of the switching circuit 12 changes, the state of the backup power supply 13 also changes accordingly. This enables the backup power supply 13 to play its role in a timely manner when the main power supply status changes (e.g., power failure), thus preventing the concentrator from being powered off and avoiding the impact on the area caused by the power failure of the concentrator.

[0024] Therefore, the backup power supply circuit 1 for the concentrator according to the embodiments of this application has a simple and reliable structure and is easy to use. When the main power supply fails, the backup power supply 13 can supply power to the concentrator in a timely manner. Compared with the traditional single power supply system of the concentrator, this application can realize dual power supply and prevent the negative impact of the concentrator not working due to the failure of the mains power.

[0025] In one embodiment, the main power supply's power supply state includes a non-power-off state and a power-off state, wherein: when the main power supply's power supply state is a non-power-off state, the switching circuit 12 is turned off, the backup power supply 13 charges itself based on a first voltage, and the capacitor filter circuit 14 outputs a voltage for powering the concentrator based on the first voltage; when the main power supply's power supply state is a power-off state, the switching circuit 12 is turned on, the backup power supply 13 is connected to the capacitor filter circuit 14 via the switching circuit 12, and the capacitor filter circuit 14 outputs a voltage for powering the concentrator based on the discharge voltage of the backup power supply 13.

[0026] In this embodiment, when the main power supply is normal, the switching circuit 12 is in the off state. The voltage output by the isolation circuit 11 can not only power the concentrator after passing through the capacitor filter circuit 14, but also charge the backup power supply 13. This ensures that the backup power supply 13 can replenish sufficient power when the main power supply is normal, providing adequate and accurate power when the backup power supply 13 is needed. Furthermore, no additional power supply is required for the backup power supply 13, resulting in a simple structure, ease of implementation, and high energy utilization. When the main power supply fails, it cannot output voltage through the isolation circuit 11, thus preventing it from powering the concentrator. The backup power supply 13 also stops receiving charging from the voltage output by the main power supply through the isolation circuit 11. The switching circuit 12 immediately switches from the off state to the on state, connecting the backup power supply 13 to the capacitor filter circuit 14. This allows the backup power supply 13 to power the concentrator, ensuring uninterrupted operation and effectively avoiding the adverse effects of intermittent operation of the concentrator.

[0027] In other embodiments, the backup power supply 13 may also be powered by a separate power supply terminal. The relationship between the switching state of the switching circuit 12 and the power supply state of the main power supply may differ from the embodiments described above. For example, the structure and position of the switching circuit 12 in the backup power supply circuit 1 may be changed so that it is turned on when the main power supply is uninterrupted, ensuring that the main power supply can power the concentrator at this time, and turned off when the main power supply is de-energized, ensuring that the backup power supply 13 can power the concentrator at this time.

[0028] The following description, using the first embodiment described above as an example, illustrates the specific structural examples of the isolation circuit 11, the switching circuit 12, the backup power supply 13, and the capacitor filter circuit 14. It should be understood that the circuit structures described below are merely exemplary, and these circuits can also be other structures, as long as they can achieve their respective functions described above.

[0029] In one example, the isolation circuit 11 may include a first diode, a second diode, and a third diode. The anode of the first diode is connected to the main power supply, and the cathode of the first diode is connected to the anode of the second diode. The cathode of the second diode is connected to the switching circuit 12 and the capacitor filter circuit 14. The anode of the third diode is connected to the main power supply, and the cathode of the third diode is connected to the switching circuit 12. In this example, the isolation circuit 11 is implemented using three diodes, resulting in a simple structure, extremely low cost, fast response, no delay, small size, unidirectional isolation to prevent reverse interference, and overvoltage protection potential. Exemplarily, the first and second diodes can both be step-down isolation diodes, thus enabling the isolation circuit 11 to perform both step-down and isolation functions, simply and effectively converting potentially higher voltages to lower voltages suitable for concentrator use.

[0030] In embodiments of this application, the switching circuit 12 may include a first transistor, a second transistor, and a first resistor. The gate of the first transistor is connected to the first terminal of the first resistor, the drain of the first transistor is connected to the backup power supply 13, and the source of the first transistor is connected to the source of the second transistor. The gate of the second transistor is connected to the first terminal of the first resistor, and the drain of the second transistor is connected to the isolation circuit 11 and the capacitor filter circuit 14. The second terminal of the first resistor is grounded. In this embodiment, the switching circuit 12 is implemented using transistors and a resistor, resulting in a simple structure and extremely low cost. Furthermore, the series connection of the two transistors enhances switching reliability, reduces false triggering, improves the anti-interference capability of the switching circuit 12, and increases its withstand voltage. Finally, the addition of a series resistor enables voltage division and current limiting to protect the transistors. For example, both the first and second transistors are PMOS transistors, which are more suitable for low-voltage control scenarios, eliminating the need for complex drive circuits and simplifying the design.

[0031] In embodiments of this application, the capacitor filter circuit 14 may include a first capacitor, a second capacitor, and a third capacitor. The first terminal of the first capacitor is connected to the isolation circuit 11 and the switching circuit 12, and the second terminal of the first capacitor is grounded. The first terminal of the second capacitor is connected to the first terminal of the first capacitor, and the second terminal of the second capacitor is grounded. The first terminal of the third capacitor is connected to the first terminal of the second capacitor, and the second terminal of the third capacitor is grounded. The capacitor filter circuit 14 can provide a stable, low-ripple DC voltage to the concentrator, ensuring normal operation of the equipment. In this embodiment, using three parallel capacitors to implement the capacitor filter circuit 14 can achieve a more comprehensive and stable filtering effect than a single or two capacitors through complementary frequency coverage, optimized parasitic parameters, improved redundancy reliability, and enhanced dynamic response.

[0032] In embodiments of this application, the backup power supply 13 may include a lithium battery, with the positive terminal of the lithium battery connected to the switching circuit 12 and the negative terminal grounded. Lithium batteries outperform traditional batteries in terms of energy density, self-discharge rate, cycle life, and environmental adaptability, thus providing better backup power for the concentrator. In other embodiments, the backup power supply 13 may also include other battery or circuit structures.

[0033] In the embodiments of this application, the backup power circuit 1 can be applied to 4G concentrators, 5G concentrators, or concentrators using other wireless transmission technologies.

[0034] The above examples illustrate the specific structural examples of isolation circuit 11, switching circuit 12, backup power supply 13, and capacitor filter circuit 14. The following section will discuss these examples in conjunction with... Figure 2 Describe the backup power supply circuit for a concentrator obtained by combining these examples. For example... Figure 2 As shown, the backup power supply circuit includes, in sequence, AC power to +5V DC input (i.e., an example of the main power supply mentioned above), backup lithium battery (i.e., an example of the backup power supply mentioned above), dual PMOS switching circuit (i.e., an example of the switching circuit mentioned above), dual buck diodes (i.e., an example of the isolation circuit mentioned above), and capacitor filter circuit.

[0035] In this circuit, the 220V AC mains power is converted to +5V DC power. Two step-down isolation diodes, D1 (an example of the first diode mentioned above) and D2 (an example of the second diode mentioned above), are used to convert the input +5V to 4.2V (an example of the first voltage mentioned above) to power the concentrator (e.g., a 4G concentrator). CT1 (an example of the first capacitor mentioned above), CT2 (an example of the second capacitor mentioned above), and C1 (an example of the third capacitor mentioned above) are three filter capacitors. T1 (an example of the first transistor mentioned above) and T2 (an example of the second transistor mentioned above) are a switching circuit composed of dual PMOS transistors.

[0036] Specifically, the AC power is converted to +5V DC input and connected to the anode of pin 1 of diodes D1 and D3 (the example of the third diode mentioned earlier). The cathode of pin 2 of D1 is connected to the anode of pin 1 of D2. The cathode of pin 2 of D3 is connected to pin 1 of resistor R1 (the example of the first resistor mentioned earlier). Pin 2 of R1 is connected to ground. Resistor R1 can be used as part of a switching circuit or as part of an isolation circuit.

[0037] Furthermore, the capacitor filter circuit includes CT1, CT2, and C1. The cathode of pin 2 of D2 is connected to the positive terminal of pin 1 of CT1, the positive terminal of pin 1 of CT2, and the pin 1 of C1. The negative terminals of pins 2 of CT1, 2 of CT2, and C1 are all connected to ground.

[0038] Furthermore, the backup lithium battery includes BT1, the negative terminal of which is connected to ground.

[0039] Furthermore, the dual PMOS switching circuit includes T1 and T2. The positive terminal of the BT1 lithium battery is connected to the drain of the 3rd terminal of T1, the 1st terminal of R1 is connected to the gate of the 1st terminal of T1 and T2, the source of the 2nd terminal of T1 is connected to the source of the 2nd terminal of T2, and the drain of the 3rd terminal of T2 is connected to the cathode of the 2nd terminal of D2.

[0040] The working principle of this backup power circuit is as follows: When the mains power is normal, the +5V converted from the mains power is converted to +4.2V by two step-down diodes. At this time, the +4.2V supplies power to the 4G concentrator system and charges the lithium battery simultaneously. Meanwhile, the gates of T1 and T2 are at a high level, and the source and drain of T1 and T2 are not connected. When the mains power is interrupted, due to the pull-down resistor R1, T1 and T2... When the gate of the transistor is at a low level, a voltage drop occurs between the source and gate of the MOSFETs T1 and T2, causing the drain and source of the MOSFETs T1 and T2 to conduct, and the output power is supplied by the BT1 lithium battery to power the 4G concentrator system. When the mains power returns to normal, the gate of the MOSFETs T1 and T2 is at a high level, and the source and drain of T1 and T2 are no longer conducting. The 4G concentrator power supply system will then select to allow the mains power to supply power. At this time, the +5V DC power converted from the mains power supplies power to the 4G concentrator system and charges the lithium battery at the same time.

[0041] In one example, diodes D1 and D2 are SS22 type, with parameters of 2A forward current and 20V reverse withstand voltage; D3 is 1N4148WS type; resistor R1 is 2K / 0.25W / %1; PMOS transistors T1 and T2 are AO3407 type. The inventor has experimentally verified that the backup power supply circuit obtained with the above combination of components can achieve reliable performance.

[0042] This backup power circuit is ingeniously designed, simple and reliable in structure, and easy to use. When the mains power fails, the backup lithium battery can quickly switch to the main circuit to power the concentrator system. Compared with the traditional single power supply system of the concentrator, this circuit can achieve dual power supply and prevent the negative impact of the concentrator not working when the mains power fails. Figure 3 This is an example of the working scenario for the backup power supply circuit. For simplicity, only the backup lithium battery is shown in the figure, while other circuit structures are illustrated. These other circuit structures can also be integrated into the concentrator. Based on the dual power supply guarantee of mains power to 5V DC and backup lithium battery, the concentrator can operate uninterruptedly. The main unit collector collects readings from multiple smart gas meters, and the concentrator can reliably manage, process, and transmit these readings, avoiding the adverse effects of mains power outages.

[0043] According to another aspect of this application, an electronic device is also provided, which includes the backup power supply circuit for a concentrator described in the embodiments of this application. Further, the electronic device may also include a main power supply connected to an isolation circuit of the backup power supply circuit, thereby more conveniently realizing dual power supply for the concentrator. Exemplarily, the electronic device can be a power supply or a concentrator. The backup power supply circuit of this application can be used as an external power supply for the concentrator, or it can be integrated inside the concentrator, and can be configured according to specific needs. Exemplarily, when the electronic device is a power supply, the power supply may only include the backup power supply circuit described in the above embodiments, or it may simultaneously include a backup power supply and a main power supply connected to an isolation circuit of the backup power supply circuit; when the electronic device is a concentrator, the concentrator may only include the backup power supply circuit described in the above embodiments, or it may simultaneously include a backup power supply and a main power supply connected to an isolation circuit of the backup power supply circuit.

[0044] Based on the above description, the backup power supply circuit and electronic equipment for the concentrator according to the embodiments of this application are simple, reliable and easy to use. When the main power supply fails, the backup power supply can supply power to the concentrator in a timely manner. Compared with the traditional single power supply system of the concentrator, this application can realize dual power supply and prevent the negative impact of the concentrator not working due to the failure of the mains power.

[0045] Although exemplary embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above exemplary embodiments are merely illustrative and are not intended to limit the scope of this application. Various changes and modifications can be made therein by those skilled in the art without departing from the scope and spirit of this application. All such changes and modifications are intended to be included within the scope of this application as claimed in the appended claims.

[0046] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0047] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of 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 device, or some features may be ignored or not executed.

[0048] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of this application may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0049] Similarly, it should be understood that, for the purpose of simplification and aiding understanding of one or more aspects of this application, various features of this application may sometimes be grouped together in a single embodiment, figure, or description thereof in the description of exemplary embodiments of this application. However, the approach of this application should not be construed as reflecting an intention that the claimed application requires more features than are expressly recited in each claim. Rather, as reflected in the corresponding claims, its inventive point lies in solving the corresponding technical problem with fewer features than all features of a single disclosed embodiment. Therefore, the claims following the detailed description are hereby expressly incorporated into that detailed description, wherein each claim itself is a separate embodiment of this application.

[0050] Those skilled in the art will understand that, apart from the mutual exclusion of features, all features disclosed in this specification (including the accompanying claims, abstract, and drawings) and all processes or elements of any method or apparatus so disclosed may be combined in any combination. Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstract, and drawings) may be replaced by an alternative feature that serves the same, equivalent, or similar purpose.

[0051] Furthermore, those skilled in the art will understand that although some embodiments herein include certain features but not others included in other embodiments, combinations of features from different embodiments are intended to be within the scope of this application and form different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

[0052] The various component embodiments of this application can be implemented in hardware, or as software modules running on one or more processors, or a combination thereof. Those skilled in the art will understand that microprocessors or digital signal processors (DSPs) can be used in practice to implement some or all of the functions of some modules in the article analysis device according to embodiments of this application. This application can also be implemented as an apparatus program (e.g., a computer program and computer program product) for performing part or all of the methods described herein. Such an implementation of this application can be stored on a computer-readable medium, or can be in the form of one or more signals. Such signals can be downloaded from an Internet website, provided on a carrier signal, or provided in any other form.

[0053] It should be noted that the above embodiments are illustrative of this application and not restrictive, and that those skilled in the art can devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses should not be construed as limiting the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. This application can be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc., does not indicate any order. These words can be interpreted as names.

[0054] The above are merely specific embodiments or descriptions of specific embodiments of this application. The scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. The scope of protection of this application shall be determined by the scope of the claims.

Claims

1. A backup power supply circuit for a concentrator, characterized in that, The backup power circuit includes: An isolation circuit, connected to the main power supply, switching circuit, and capacitor filter circuit, is used to isolate the main power supply from the backup power supply and convert the main power supply voltage into a first voltage. The switching circuit is connected to the backup power supply, the isolation circuit, and the capacitor filter circuit, and is used to turn off or on based on the power supply status of the main power supply. The backup power supply is connected to the switching circuit and is used to charge or discharge based on the switching state of the switching circuit. The capacitor filter circuit is used to output a voltage to power the concentrator based on the first voltage or the discharge voltage of the backup power supply.

2. The backup power supply circuit according to claim 1, characterized in that, The main power supply's power supply states include a non-power-off state and a power-off state, wherein: When the main power supply is in the non-power-off state, the switching circuit is turned off, the backup power supply charges itself based on the first voltage, and the capacitor filter circuit outputs the voltage to supply power to the concentrator based on the first voltage. When the main power supply is in the power-off state, the switching circuit is turned on, and the backup power supply is connected to the capacitor filter circuit via the switching circuit. The capacitor filter circuit outputs a voltage to supply power to the concentrator based on the discharge voltage of the backup power supply.

3. The backup power supply circuit according to claim 1 or 2, characterized in that, The isolation circuit includes: A first diode, the anode of which is connected to the main power supply, and the cathode of which is connected to the anode of a second diode; The second diode, the cathode of which is connected to the switching circuit and the capacitor filter circuit; The third diode has its anode connected to the main power supply and its cathode connected to the switching circuit.

4. The backup power supply circuit according to claim 3, characterized in that, The first diode and the second diode are step-down isolation diodes.

5. The backup power supply circuit according to claim 1 or 2, characterized in that, The switching circuit includes: The first transistor has its gate connected to the first terminal of the first resistor, its drain connected to the backup power supply, and its source connected to the source of the second transistor. The second transistor has its gate connected to the first terminal of the first resistor, and its drain connected to the isolation circuit and the capacitor filter circuit. The first resistor has its second terminal grounded.

6. The backup power supply circuit according to claim 1 or 2, characterized in that, The capacitor filter circuit includes: A first capacitor, the first terminal of the first capacitor is connected to the isolation circuit and the switching circuit, and the second terminal of the first capacitor is grounded; The second capacitor has its first terminal connected to the first terminal of the first capacitor, and its second terminal grounded. The third capacitor has its first terminal connected to the first terminal of the second capacitor, and its second terminal grounded.

7. The backup power supply circuit according to claim 1 or 2, characterized in that, The backup power supply includes: A lithium battery, wherein the positive terminal of the lithium battery is connected to the switching circuit, and the negative terminal of the lithium battery is grounded.

8. An electronic device, characterized in that, The electronic device includes a backup power supply circuit for a concentrator as described in any one of claims 1-7.

9. The electronic device according to claim 8, characterized in that, The electronic device also includes a main power supply connected to an isolation circuit of the backup power supply circuit.

10. The electronic device according to claim 8 or 9, characterized in that, The electronic device is a power supply or a concentrator.

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