Battery backup power supply circuit and system

Abstract

The utility model discloses a battery backup power supply circuit and system. The battery backup power supply circuit comprises a power conversion module; the power conversion module comprises a converter and an energy storage battery, and is used for superposing the output voltage of the converter and the voltage of the energy storage battery to form the output voltage of the battery backup power supply circuit; wherein the input stage of the converter is connected with the energy storage battery in parallel, and the output stage of the converter is connected with the energy storage battery in series. According to the invention, the converter with the same power capacity can provide higher power output capability; according to the same complete machine power requirement, a converter with smaller power or size can be used for realizing, and the efficiency of the system can also be obviously improved; the dynamic performance of the system can be optimized by using the charging and discharging capacity of the backup circuit, additional specific charging steps are not needed, and the backup battery is slowly charged by using the overcharge energy of the voltage in the dynamic state.

Description

Technical Field

[0001] This application relates to battery backup circuits, and more specifically, to a battery backup power supply circuit and system. Background Technology

[0002] Battery backup power circuits are widely used in many applications requiring uninterrupted power supply, such as data centers, hospitals, and traffic lights, due to their advantages of uninterrupted power supply, voltage stability, and load protection. They mainly consist of energy storage, converters, and switches. When the mains power is normal, AC power is converted to DC power by a rectifier and then stored in the battery. In the event of an abnormal mains power supply or power outage, the battery converts the AC power back to AC power by an inverter to continue supplying power.

[0003] In traditional battery backup power supplies, power conversion is typically achieved using a DC-to-DC converter circuit where the battery serves as the input and the converter directly outputs the power. In this approach, the converter's output power is the same as the entire system's output power, resulting in low system power utilization. Utility Model Content

[0004] In order to solve at least one of the technical problems in the background art described above, this application proposes a battery backup power supply circuit and system.

[0005] The battery backup power supply circuit of this application includes a power conversion module; the power conversion module includes a converter and an energy storage battery, and is used to superimpose the output voltage of the converter and the voltage of the energy storage battery to form the output voltage of the battery backup power supply circuit; wherein, the input stage of the converter is connected in parallel with the energy storage battery, and the output stage of the converter is connected in series with the energy storage battery.

[0006] Optionally, the energy storage battery includes multiple energy storage units connected in parallel; wherein, each energy storage unit includes a controllable switch and a battery unit, and the controllable switch and the battery unit are connected one-to-one.

[0007] Optionally, the converter may include a bidirectional converter or a unidirectional converter.

[0008] Optionally, the power conversion module includes: the positive input terminal of the converter is connected to the positive terminal of the energy storage battery, and the positive output terminal is connected to the positive input terminal of the electrical device; the negative input terminal of the converter is connected to the positive terminal of the energy storage battery, and the negative output terminal and the negative terminal of the energy storage battery are connected to the negative input terminal of the electrical device.

[0009] Optionally, the power conversion module includes: the negative input terminal of the converter is connected to the negative terminal of the energy storage battery, and the negative output terminal is connected to the negative input terminal of the electrical device; the positive input terminal of the converter is connected to the negative terminal of the energy storage battery, and the positive output terminal and the positive terminal of the energy storage battery are connected to the positive input terminal of the electrical device.

[0010] Optionally, the power conversion module includes: the positive input terminal of the converter is connected to the negative terminal of the energy storage battery, and the positive output terminal and the positive terminal of the energy storage battery are connected to the positive input terminal of the electrical device; the negative input terminal and negative output terminal of the converter are connected to the negative input terminal of the electrical device.

[0011] Optionally, the power conversion module includes: the negative input terminal of the converter is connected to the positive terminal of the energy storage battery, and the negative output terminal and the negative terminal of the energy storage battery are connected to the negative input terminal of the electrical device; the positive input terminal and positive output terminal of the converter are connected to the negative input terminal of the electrical device.

[0012] Optionally, the converter can be an isolated converter or a non-isolated converter.

[0013] Optionally, the isolated converter includes a series resonant converter, a dual active full-bridge converter, and a shifted full-bridge converter.

[0014] Optionally, the non-isolated converter includes Buck, Boost, Buck-Boost, Cup, and Sepic.

[0015] This application also provides a battery backup power system including the aforementioned battery backup power circuit, the system comprising multiple battery backup power circuits connected in series or parallel.

[0016] Optionally, the system further includes multiple control switches, and the battery backup power circuit is connected to the electrical device in parallel or in series through the control switches; wherein, the control switches are used to turn on or off the circuit connection between the corresponding battery backup power circuit and the electrical device according to the received control command.

[0017] The beneficial effects of this application are: a converter with the same power capacity can achieve 3 times or even higher power output capability; a converter with smaller power or size can be used to achieve the same overall power requirements; as the power capacity of the converter is reduced, the converter loss will also be reduced accordingly, and the efficiency of the system will be significantly improved. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0019] Figure 1 This is a first schematic diagram of the structure of the power conversion module provided in the embodiments of this application;

[0020] Figure 2 This is a second schematic diagram of the structure of the power conversion module provided in the embodiments of this application;

[0021] Figure 3 This is a third schematic diagram of the structure of the power conversion module provided in the embodiments of this application;

[0022] Figure 4 This is a fourth schematic diagram of the structure of the power conversion module provided in the embodiments of this application;

[0023] Figure 5A and Figure 5B This is a schematic diagram of the connection structure of the isolated converter provided in the embodiments of this application;

[0024] Figure 6A and Figure 6B This is a schematic diagram of the connection structure of the non-isolated converter provided in the embodiments of this application;

[0025] Figure 7 This is a schematic diagram of the series structure of the battery backup power supply circuit provided in the embodiments of this application;

[0026] Figure 8 This is a schematic diagram of the parallel structure of the battery backup power supply circuit provided in the embodiments of this application. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Specific embodiments of the present invention are disclosed in detail with reference to the following description and accompanying drawings, indicating how the principles of the present invention can be employed. It should be understood that the embodiments of the present invention are not limited in scope. Within the spirit and scope of the appended claims, the embodiments of the present invention include many changes, modifications, and equivalents.

[0029] Features described and / or illustrated for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.

[0030] It should be emphasized that the term "including / comprises" as used herein refers to the presence of a feature, whole, step, or component, but does not exclude the presence or addition of one or more other features, wholes, steps, or components.

[0031] The battery backup power supply circuit of this application includes a power conversion module; the power conversion module includes a converter and an energy storage battery, and is used to superimpose the output voltage of the converter and the voltage of the energy storage battery to form the output voltage of the battery backup power supply circuit; wherein, the input stage of the converter is connected in parallel with the energy storage battery, and the output stage of the converter is connected in series with the energy storage battery.

[0032] Specifically, this application uses a converter output stage connected in series with the energy storage battery and an input stage connected in parallel with the energy storage battery to superimpose the converter's output voltage with the battery voltage as the overall voltage output. This fully utilizes the energy storage battery's own power output capability to improve the overall system output power and effectively reduces the converter's requirements and size. The converter may include a bidirectional converter or a unidirectional converter, and the positions of the converter and the energy storage battery can be interchanged to meet the connection requirements in different scenarios. This avoids the situation in traditional battery backup power supplies where the energy storage battery only serves as an input and all output power comes solely from the converter's output.

[0033] In practical applications, power conversion modules mainly consist of an energy storage battery and a converter. These can be freely combined in four different connection methods according to actual needs. See below for details. Figures 1 to 4 As shown:

[0034] Please refer to Figure 1 As shown, in one embodiment of this application, the power conversion module includes: the positive input terminal of the converter is connected to the positive terminal of the energy storage battery, and the positive output terminal is connected to the positive input terminal of the electrical device; the negative input terminal of the converter is connected to the positive terminal of the energy storage battery, and the negative output terminal and the negative terminal of the energy storage battery are connected to the negative input terminal of the electrical device.

[0035] Please refer to this again. Figure 2As shown in one embodiment of this application, the power conversion module includes: the negative input terminal of the converter is connected to the negative terminal of the energy storage battery, and the negative output terminal is connected to the negative input terminal of the electrical device; the positive input terminal of the converter is connected to the negative terminal of the energy storage battery, and the positive output terminal and the positive terminal of the energy storage battery are connected to the positive input terminal of the electrical device.

[0036] In the above structure, the converter is connected in series with the energy storage battery at the output stage and in parallel at the input stage; the only difference between the two is that the converter is connected in parallel to the positive and negative sides of the energy storage battery. Those skilled in the art can choose the corresponding connection method and structure according to actual needs.

[0037] In the above embodiments, the energy storage battery comprises multiple parallel energy storage units; wherein, each energy storage unit includes a controllable switch and a battery unit, and the controllable switch and the battery unit are connected one-to-one. In this structure, the energy storage battery serves as a power output structure with adjustable output power. It can be a type of battery integration. In practical applications, different numbers or different power levels of battery units can be connected in parallel according to the user's needs of the electrical equipment to achieve adjustable power of the energy storage battery. Operators can set multiple battery units with different or the same power levels to be connected in parallel according to actual needs, and this application does not impose further limitations on it.

[0038] Please refer to Figure 3 As shown, in one embodiment of this application, the power conversion module includes: the positive input terminal of the converter is connected to the negative terminal of the energy storage battery, and the positive output terminal and the positive terminal of the energy storage battery are connected to the positive input terminal of the electrical device; the negative input terminal and the negative output terminal of the converter are connected to the negative input terminal of the electrical device.

[0039] Please refer to this again. Figure 4 As shown, in one embodiment of this application, the power conversion module includes: the negative input terminal of the converter is connected to the positive terminal of the energy storage battery, and the negative output terminal and the negative terminal of the energy storage battery are connected to the negative input terminal of the electrical device; the positive input terminal and positive output terminal of the converter are connected to the negative input terminal of the electrical device.

[0040] In the above structure, the converter is connected in series with the energy storage battery at the output stage and in parallel at the input stage. The only difference is that the energy storage battery is connected in parallel at the positive output stage and the positive input stage of the converter or at the negative output stage and the negative input stage of the converter. Those skilled in the art can choose the corresponding connection method and structure according to actual needs.

[0041] comprehensive Figures 1 to 4As can be seen, there are no other restrictions on the connection between the converter and the energy storage battery in this application. As long as the input stage of the converter is connected in parallel with the energy storage battery and the output stage of the converter is connected in series with the energy storage battery, the combination connection method of the two is mainly set by the staff according to actual needs. Those skilled in the art can choose one of the above four methods to use based on actual needs. This application does not impose any restrictions on it.

[0042] In one embodiment of this application, the converter is an isolated converter or a non-isolated converter. The isolated converter includes a series resonant converter, a dual active full-bridge converter, and a shifted full-bridge converter; the non-isolated converter includes Buck, Boost, Buck-Boost, Cup, and Sepic converters.

[0043] Please refer to the details. Figure 5A and Figure 5B As shown, the connection structure of the isolated converter follows the same principle as described above. Figure 1 and Figure 2 The connection structure is similar, only used to determine the positions of the input stage and output stage in the isolated converter, and then connect them to the energy storage power supply, so that the input stage of the converter is connected in parallel with the energy storage battery, and the output stage of the converter is connected in series with the energy storage battery.

[0044] Similarly, please refer to Figure 6A and Figure 6B As shown, the principle for the connection structure of a non-isolated converter can be found in [reference needed]. Figure 3 and Figure 4 The connection logic, wherein the internal structure of the non-isolated converter can be selected and replaced according to actual needs, and this application does not impose further restrictions on it.

[0045] This application also provides a battery backup power system including the aforementioned battery backup power circuit, wherein the system includes multiple battery backup power circuits connected in series or parallel. See reference. Figure 7 or Figure 8 As shown, in this structure, greater power can be achieved through multiple battery backup power circuits, i.e., by changing the current or voltage of the battery backup power system to adapt to different electrical devices or system inputs; specifically, through... Figure 7 As can be seen from the structure, connecting multiple battery backup power circuits in series can effectively increase the current of the overall battery backup power system, achieving the purpose of changing the output power through current superposition; similarly, please refer to... Figure 8 As shown, connecting multiple battery backup power circuits in parallel can effectively increase the voltage of the overall battery backup power system, thereby changing the output power through voltage superposition.

[0046] In the above embodiments, the system may further include multiple control switches, and the battery backup power circuit is connected to the electrical device in parallel or in series through the control switches; wherein, the control switches are used to turn on or off the circuit connection between the corresponding battery backup power circuit and the electrical device according to the received control command.

[0047] Specifically, in practical applications, multiple different control switches can be used to control the connection and disconnection of different battery backup power circuits, thereby adjusting the overall output power of the battery backup power system and thus changing the overall system output power. The advantage of this approach is that by configuring the control switches, the same battery backup power system can be adapted to different electrical devices, effectively expanding the applicability of the battery backup power system. The control commands for the control switches can be derived from existing load devices, and their principles can be referenced from existing power load balancing technologies; this application does not further limit them here.

[0048] In practical applications, since the output power of the battery backup power system provided in this application is derived from the sum of the output power of the energy storage battery and the converter, those skilled in the art can select different energy storage batteries and converters to suit their specific needs. For example, a battery backup power supply may require an output voltage of 10V, a power of 100W, and a current of 10A. A 7.2V battery and a converter with an input of 7.2V and an output of 2.8V can be selected. In traditional solutions, the system output power = converter output power = 10A * 2.8V = 28W. However, by using this application to connect the converter output in series with the battery, the system output power = (2.8V + 7.2V) * 10A = 100W. A comparison clearly shows that this application has lower requirements for the converter. A converter with the same power capacity can achieve three times or even higher power output capability. For the same overall power requirement, a smaller power or smaller converter can be used. Due to the reduced power capacity of the converter, the converter's losses will also decrease accordingly, significantly improving the system's efficiency.

[0049] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. The terms "upper," "lower," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0050] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on describing the differences from other embodiments. In the description of this specification, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments in this specification. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0051] This utility model uses specific embodiments to illustrate the principle and implementation of the utility model. The above description of the embodiments is only for the purpose of helping to understand the structure and core idea of ​​the utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the utility model. Therefore, the content of this specification should not be construed as a limitation of the utility model.

Claims

1. A battery backup power supply circuit, characterized in that, Includes a power conversion module; The power conversion module includes a converter and an energy storage battery, and is used to superimpose the output voltage of the converter and the voltage of the energy storage battery to form the output voltage of the battery backup power circuit. The input stage of the converter is connected in parallel with the energy storage battery, and the output stage of the converter is connected in series with the energy storage battery.

2. The battery backup power supply circuit according to claim 1, characterized in that, The power conversion module includes: The positive input terminal of the converter is connected to the positive terminal of the energy storage battery, and the positive output terminal is connected to the positive input terminal of the electrical device. The negative input terminal of the converter is connected to the positive terminal of the energy storage battery, and the negative output terminal and the negative terminal of the energy storage battery are connected to the negative input terminal of the electrical device.

3. The battery backup power supply circuit according to claim 1, characterized in that, The power conversion module includes: The negative input terminal of the converter is connected to the negative terminal of the energy storage battery, and the negative output terminal is connected to the negative input terminal of the electrical equipment. The positive input terminal of the converter is connected to the negative terminal of the energy storage battery, and the positive output terminal and the positive terminal of the energy storage battery are connected to the positive input terminal of the electrical device.

4. The battery backup power supply circuit according to claim 1, characterized in that, The power conversion module includes: The positive input terminal of the converter is connected to the negative terminal of the energy storage battery, and the positive output terminal and the positive terminal of the energy storage battery are connected to the positive input terminal of the electrical device. The negative input terminal and negative output terminal of the converter are connected to the negative input terminal of the electrical equipment.

5. The battery backup power supply circuit according to claim 1, characterized in that, The power conversion module includes: The negative input terminal of the converter is connected to the positive terminal of the energy storage battery, and the negative output terminal and the negative terminal of the energy storage battery are connected to the negative input terminal of the electrical device. The positive input and positive output terminals of the converter are connected to the negative input terminal of the electrical equipment.

6. The battery backup power supply circuit according to claim 1, characterized in that, The converter is either a bidirectional converter or a unidirectional converter.

7. The battery backup power supply circuit according to any one of claims 1 to 6, characterized in that, The converter can be an isolated converter or a non-isolated converter.

8. The battery backup power supply circuit according to claim 7, characterized in that, The isolated converter includes a series resonant converter, a dual active full-bridge converter, and a shifted full-bridge converter.

9. The battery backup power supply circuit according to claim 7, characterized in that, The non-isolated converters include Buck, Boost, Buck-Boost, Cup, and Sepic.

10. The battery backup power supply circuit according to claim 7, characterized in that, The energy storage battery comprises multiple energy storage units connected in parallel; The energy storage unit includes a controllable switch and a battery unit, with the controllable switch and the battery unit connected one-to-one.

11. A battery backup power system comprising the battery backup power circuit according to any one of claims 1 to 10, characterized in that, The system includes multiple battery backup power circuits connected in series or in parallel.

12. The battery backup power system according to claim 11, characterized in that, The system also includes multiple control switches, and the battery backup power circuit is connected to the electrical equipment in parallel or in series through the control switches. The control switch is used to turn on or off the circuit connection between the battery backup power circuit and the electrical equipment according to the received control command.

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