Charging device, inverter, and charging system

Abstract

The utility model discloses a charging device, an inverter and a charging system, and the charging device comprises a first interface which is used for accessing an AC power supply; a second interface including a battery connection terminal adapted to be connected to a battery pack of the electric tool; the power conversion module is provided with a first circuit end and a second circuit end and is used for converting an alternating-current power supply into a direct-current power supply; the output power of the charging equipment is greater than or equal to 500W; the power supply conversion module comprises an alternating current-direct current conversion module for converting an alternating current power supply into a first direct current, wherein the alternating current-direct current conversion module comprises a totem pole bridgeless power factor correction circuit; and the direct current-direct current conversion module is used for converting the first direct current into the second direct current and is connected with the alternating current-direct current conversion module. By adopting the technical scheme, the charging equipment for quickly charging the battery pack of the electric tool can be provided.

Description

Technical Field

[0001] The present application relates to an energy device, and in particular to a charging device, an inverter and a charging system. Background Art

[0002] Power tools such as drills, circular saws, sanders, and lawn mowers typically use battery packs as their energy source, making them environmentally friendly and environmentally friendly. Battery packs can store a certain amount of power. When the battery pack is low, AC mains power is required to recharge the battery pack. This requires a charger to convert the AC power into energy.

[0003] Currently, the charging speed of using a charging device to charge the battery pack of an electric tool is slow, which cannot meet the situation when the battery pack is low on power and the electric tool is urgently needed.

[0004] This section provides background information related to the present application which is not necessarily prior art. Utility Model Content

[0005] In order to address the deficiencies of the prior art, the purpose of this application is to provide a charging device, an inverter and a charging system that can improve the efficiency of charging the battery pack of a power tool.

[0006] In order to achieve the above-mentioned objectives, the present application adopts the following technical solution: a charging device, comprising: a first interface for accessing an AC power supply; a second interface, comprising a battery connection terminal suitable for connecting to a battery pack of an electric tool; a power conversion module, having a first circuit end and a second circuit end, for converting the AC power supply into a DC power supply; wherein the first circuit end is electrically connected to the first interface, and the second circuit end is electrically connected to the second interface; the output power of the charging device is greater than or equal to 500W; the power conversion module comprises: an AC-DC conversion module for converting the AC power supply into a first DC power, the AC-DC conversion module comprising a totem pole bridgeless power factor correction circuit; a DC-DC conversion module for converting the first DC power into a second DC power, connected to the AC-DC conversion module.

[0007] In some embodiments, the DC-DC conversion module includes: a processing module, an inverter module and a rectifier module, the inverter module and the rectifier module are respectively connected to the processing module, the inverter module converts the first DC power into the first AC power, the processing module converts the first AC power into the second AC power, and the rectifier module converts the second AC power into the second DC power.

[0008] In some embodiments, the processing module includes a resonance module and a first transformer module. The resonance module filters the first alternating current, and the first transformer module converts the filtered first alternating current into a second alternating current.

[0009] In some embodiments, the processing module further includes a capacitor module, the capacitor module includes a plurality of resonant capacitors, and the plurality of resonant capacitors are sequentially connected in parallel on the capacitor circuit board.

[0010] In some embodiments, the charging device includes a circuit board, and the capacitor circuit board is vertically electrically connected to the circuit board.

[0011] In some embodiments, the charging device further includes a second voltage transformation module for maintaining or increasing the voltage, and the second voltage transformation module is connected to the DC-DC conversion module.

[0012] In some embodiments, the charging device further includes a control module, which is connected to the second transformer module and adjusts the operating mode of the second transformer module according to the output voltage of the second transformer module.

[0013] In some embodiments, when the output voltage of the second transformer module is less than or equal to a preset range, the control module controls the working mode of the second transformer module to maintain the voltage; when the voltage of the second transformer module is greater than the preset range, the control module controls the working mode of the second transformer module to increase the voltage.

[0014] In some embodiments, the DC-DC conversion module includes a full-bridge resonant LLC.

[0015] In some embodiments, an inverter includes: a first interface, including a battery connection terminal suitable for connecting to a battery pack of an electric tool; a second interface, for connecting to a load; a power conversion module, having a first circuit end and a second circuit end, converting DC power into AC power; wherein, the first circuit end is electrically connected to the first interface, and the second circuit end is electrically connected to the second interface; the output power of the inverter is greater than or equal to 500W; the power conversion module includes: a DC-DC conversion module and a DC-AC conversion module, and the DC-AC conversion module is connected to the DC-DC conversion module; after the DC-DC conversion module converts the third DC power into a fourth DC power, the DC-AC conversion module converts the fourth DC power into a third AC power; wherein, the DC-AC conversion module includes a totem pole bridgeless power factor correction circuit.

[0016] In some embodiments, the DC-DC conversion module includes a full-bridge resonant LLC.

[0017] In some embodiments, a charging system includes: a battery pack of an electric tool and a charging device for charging the battery pack; wherein the charging device includes: a first interface for accessing an AC power source; a second interface including a battery connection terminal suitable for connecting to the battery pack; a power conversion module having a first circuit end and a second circuit end; wherein the first circuit end is electrically connected to the first interface, and the second circuit end is electrically connected to the second interface; the output power of the charging device is greater than or equal to 500W; the power conversion module includes: an AC-DC conversion module and a DC-DC conversion module, and the AC-DC conversion module is connected to the DC-DC conversion module; wherein the AC-DC conversion module includes a totem pole bridgeless power factor correction circuit, and the DC-DC conversion module includes a full-bridge resonant LLC.

[0018] In some embodiments, the power conversion module is a bidirectional power conversion module.

[0019] The benefit of the present application is that by adopting an AC-DC conversion module including a totem pole bridgeless power factor correction circuit, the efficiency of the AC-DC conversion module is increased, thereby making the output power of the charging device higher and being able to quickly charge the battery pack of the power tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of various power tools and electrical equipment systems according to an embodiment;

[0021] Figure 2 is a schematic diagram of a charging device according to an embodiment;

[0022] Figure 3 yes Figure 2 A schematic diagram of a power conversion module of a charging device in FIG.

[0023] Figure 4 yes Figure 3 A schematic diagram of a DC-DC module of a power conversion module;

[0024] Figure 5 yes Figure 2 Schematic diagram of the connection of the resonant capacitor of the charging device;

[0025] Figure 6 yes Figure 2 A schematic diagram of a second voltage conversion module and a control module of a charging device in FIG.

[0026] Figure 7 is a schematic diagram of an inverter according to an embodiment;

[0027] Figure 8 is a schematic diagram of a charging system according to an embodiment. DETAILED DESCRIPTION

[0028] Before any embodiments of the present application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the foregoing drawings.

[0029] In this application, the terms "comprises," "includes," "has," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0030] In this application, the term "and / or" describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Additionally, the character " / " in this application generally indicates that the related objects are in an "and / or" relationship.

[0031] In this application, the terms "connect," "combine," "couple," and "install" may refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without an intermediary, and an indirect connection refers to two parts or components being connected to at least one intermediary, with the two parts or components being connected via the intermediary. Furthermore, "connect" and "couple" are not limited to physical or mechanical connections or couplings and may include electrical connections or couplings.

[0032] In this application, it will be understood by those skilled in the art that relative terms (e.g., "about," "approximately," "substantially," etc.) used in conjunction with quantities or conditions include the values ​​and have the meaning indicated by the context. For example, the relative terms include at least the degree of error associated with the measurement of a specific value, the tolerance caused by manufacturing, assembly, use, etc. associated with a specific value. Such terms should also be considered to disclose a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to plus or minus a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. In addition, "substantially" may refer to plus or minus a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) on the basis of the indicated angle when expressing a relative angular position relationship (e.g., substantially parallel, substantially perpendicular).

[0033] In this application, it will be understood by those skilled in the art that the function performed by an assembly can be performed by one assembly, multiple assemblies, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one assembly, or a combination of multiple parts.

[0034] In the present application, the terms "upper", "lower", "left", "right", "front", "back" and other directional words are described based on the orientation and positional relationship shown in the accompanying drawings, and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to the other element "upper" or "lower", but also be indirectly connected to the other element "upper" or "lower" through an intermediate element. It should also be understood that directional words such as upper side, lower side, left side, right side, front side, back side, etc. not only represent the positive orientation, but can also be understood as the lateral orientation. For example, below can include directly below, lower left, lower right, lower front and lower back, etc.

[0035] In this application, the terms "controller," "processor," "central processing unit," "CPU," and "MCU" are used interchangeably. Where a unit "controller," "processor," "central processing unit," "CPU," or "MCU" is used to perform a particular function, unless otherwise specified, the function may be performed by a single unit or multiple units.

[0036] In this application, the terms "device", "module" or "unit" can be implemented in the form of hardware or software to achieve specific functions.

[0037] In this application, the terms "calculate", "judge", "control", "determine", "identify", etc. refer to the operations and processes of a computer system or similar electronic computing device (e.g., controller, processor, etc.).

[0038] In the present application, a variety of different types of power tools 200 can be powered by the battery pack 100 . Figure 1Several common power tools are illustrated, such as an electric drill 200a, a chainsaw 200b, a lawn mower 200c, and a hair dryer 200d. It should be noted that the power tool 200 can also be a handheld power tool, such as a drill, a pruner, or a sander. Alternatively, the power tool 200 can be a benchtop tool, such as a table saw or a miter saw. Alternatively, the power tool 200 can be a push power tool, such as a push lawn mower or a push snow blower. Alternatively, the power tool 200 can be a ride-on power tool, such as a ride-on lawn mower, a ride-on vehicle, or an all-terrain vehicle. Alternatively, the power tool 200 can be a robotic tool, such as a robotic lawn mower or a robotic snow blower. In some embodiments, the power tool 200 can be an electric drill, an electric light, or an electric vehicle. In some embodiments, the power tool 200 can also be a gardening tool, such as a pruner, a hair dryer, a lawn mower, or a chainsaw. Alternatively, the power tool 200 may also be a decoration tool, such as a screwdriver, a nail gun, a circular saw, a sander, etc. In some embodiments, the power tool 200 may also be a vegetation care tool, such as a lawn mower, a lawn mower, a pruner, a chain saw, etc. Alternatively, the power tool 200 may also be a cleaning tool, such as a hair dryer, a snow blower, a cleaning machine, etc. Alternatively, the power tool 200 may also be a drilling tool, such as a drill, a screwdriver, a wrench, an electric hammer, etc. Alternatively, the power tool 200 may also be a sawing tool, such as a reciprocating saw, a jig saw, a circular saw, etc. Alternatively, the power tool 200 may also be a bench tool, such as a table saw, a miter saw, a metal cutter, an electric milling machine, etc. Alternatively, the power tool 200 may also be a grinding tool, such as an angle grinder, a sander, etc.

[0039] In this embodiment, a variety of different electrical devices 300 can also be powered by the battery pack 100, wherein the electrical devices can be other household appliances or personal electrical devices other than the above-mentioned power tool 200, such as Figure 1 The smart phone 300a, notebook 300b, mobile power supply 300c, soybean milk machine, grinder, etc.

[0040] like Figure 2 As shown, the charging device 400 includes a first interface 401 and a second interface 402. The first interface 401 of the charging device 400 is used to access an AC power source. The second interface 402 of the charging device 400 includes a battery connection terminal suitable for connecting to the battery pack 100 of the power tool 200 and is used to connect to the battery pack 100 of the power tool 200 to charge the battery pack 100. Figure 2 As shown, the charging device 400 further includes a power conversion module 410 for converting AC power into DC power. The power conversion module 410 includes a first circuit terminal 411 and a second circuit terminal 412. The first circuit terminal 411 is electrically connected to the first interface 401, and the second circuit terminal 412 is electrically connected to the second interface 402.

[0041] like Figure 3 As shown, the power conversion module 410 includes an AC-DC conversion module 420 (i.e., an AC-DC module) and a DC-DC conversion module 430 (i.e., a DC-DC module), and the AC-DC module 420 is connected to the DC-DC module 430. The AC-DC module 420 is used to convert the AC power connected to the first interface 401 into a first DC power. The DC-DC module 430 is connected to the AC-DC module 420 and is used to convert the first DC power into a second DC power. The voltage of the second DC power may not be equal to the voltage of the first DC power. Optionally, the voltage of the second DC power is greater than the voltage of the first DC power. Optionally, the voltage of the second DC power is less than the voltage of the first DC power. Alternatively, in some cases, the voltage of the second DC power may also be equal to the voltage of the first DC power.

[0042] In some embodiments, AC-DC module 420 includes a totem-pole bridgeless power factor correction circuit (i.e., totem-pole bridgeless PFC). Compared to traditional PFC, totem-pole bridgeless PFC eliminates the input bridge rectifier, improving the efficiency of AC-DC module 420. Furthermore, the use of semiconductor field-effect transistors instead of rectifier diodes further improves the efficiency of AC-DC module 420. Consequently, AC-DC module 420 achieves higher efficiency and lower losses when converting AC power to DC power.

[0043] In some embodiments, as Figure 4 As shown, the DC-DC module 430 includes an inverter module 431, a processing module 432, and a rectifier module 433. One end of the processing module 432 is connected to the inverter module 431, and the other end of the processing module 432 is connected to the rectifier module 433. The inverter module 431 can convert direct current into alternating current. The inverter module 431 is used to convert the first direct current converted by the AC-DC module 420 into a first alternating current. The processing module 432 can filter and transform the alternating current, converting the first alternating current into a second alternating current. The voltage of the second alternating current may not be equal to the voltage of the first alternating current. The rectifier module 433 can convert alternating current into direct current. The second alternating current is used to convert the second alternating current into a second direct current, which is input into the battery pack 100 of the power tool 200 connected to the charging device 400.

[0044] In some embodiments, as Figure 4As shown, the processing module 432 includes a resonance module 4321 and a first voltage transformation module 4322. The resonance module 4321 is used to filter the AC power, and the first voltage transformation module 4322 is used to transform the filtered AC power. Specifically, the resonance module 4321 can filter the first AC power, and the first voltage transformation module 4322 can transform the filtered first AC power to produce a second AC power. The first voltage transformation module 4322 performs voltage transformation based on the voltage required by the battery pack 200 of the power tool 100 to which the charging device 400 is connected. Optionally, if the voltage of the first AC power is lower than the voltage required by the battery pack 200 of the power tool 100, the first voltage transformation module 4322 can boost the first AC power to produce the second AC power. Alternatively, if the voltage of the first AC power is higher than the voltage required by the battery pack 200 of the power tool 100, the first voltage transformation module 4322 can step down the first AC power to produce the second AC power. Optionally, if the voltage of the first AC current is equal to the voltage required by the battery pack 200 of the power tool 100, the first transformer module 4322 may not perform any processing on the first AC current, and the voltage of the second AC current is equal to the voltage of the first AC current, but the second AC current is the second AC current after filtering.

[0045] In some embodiments, as Figure 4 As shown, the processing module 432 further includes a capacitor module 4323, which is a part of the resonance module 4321 and is provided in the resonance module 4321. The capacitor module 4323 is used to filter the first alternating current when the voltage of the first alternating current is large. The capacitor module 4323 includes a plurality of resonant capacitors 4324, that is, the capacitor module 4323 includes at least one resonant capacitor 4324. In some embodiments, as Figure 5 As shown, taking three resonant capacitors 4324 as an example, the multiple resonant capacitors 4324 are connected in parallel on a capacitor circuit board A, which is soldered to the circuit board B of the charging device 400. Specifically, the capacitor circuit board A is soldered perpendicularly to the circuit board B of the charging device 400, and the capacitor circuit board A is electrically connected to the circuit board B of the charging device 400. This eliminates the need to connect the multiple resonant capacitors 4324 directly in parallel on the circuit board B of the charging device 400, thereby reducing the size of the charging device 400 and miniaturizing the charging device 400.

[0046] In some embodiments, the DC-DC module 430 includes a full-bridge resonant LLC, which can improve the efficiency of the DC-DC module 430. Due to the high efficiency of both the AC-DC module 420 and the DC-DC module 430, the output power of the charging device 400 is relatively high, thereby efficiently charging the battery pack 200 of the power tool 100, thereby improving the charging efficiency of the charging device 400. Optionally, the output power of the charging device 400 is greater than or equal to 500W. Optionally, the output power of the charging device 400 can be 800W. Optionally, the output power of the charging device 400 can be 1600W. Optionally, the output power of the charging device 400 can be 2000W. Optionally, the output power of the charging device 400 can be 3300W.

[0047] In some embodiments, as Figure 6 As shown, the charging device 400 further includes a second voltage conversion module 440. One end of the second voltage conversion module 440 is connected to the power conversion module 410, and the other end is connected to the battery pack 100 of the power tool 200. The second voltage conversion module 440 can maintain or increase the voltage. That is, after receiving the second direct current output by the DC-DC module 430, the second voltage conversion module 440 can maintain the voltage of the second direct current unchanged or increase the voltage of the second direct current.

[0048] like Figure 6 As shown, the charging device 400 also includes a control module 450, which is connected to the second transformer module 440 and adjusts the working mode of the second transformer module 440 according to the output voltage of the second transformer module 440. The working mode includes maintaining the voltage or increasing the voltage. When the output voltage of the second transformer module 440 is less than or equal to the preset range, the control module 450 controls the working mode of the second transformer module 440 to maintain the voltage. When the output voltage of the second transformer module 440 is greater than the preset range, the control module 450 controls the working mode of the second transformer module 440 to increase the voltage. The preset range is set based on an empirical value, and the preset range corresponds to the ratio of the highest voltage to the lowest voltage required by the battery pack 100 of different power tools 200 connected to the charging device 400. Among them, when the working mode of the second transformer module 440 is to increase the voltage, it means that the output voltage of the DC-DC module 430 cannot meet the high-efficiency charging requirements of the battery pack 100 of the power tool 200, that is, the DC-DC module 430 cannot efficiently output a voltage with a large variation range, and thus the second transformer module 440 is required to achieve efficient output of a voltage with a large variation range to meet the high-efficiency charging requirements of the battery packs 100 of different power tools 200.

[0049] Optionally, the preset range is set to 2, i.e., the ratio of the maximum voltage to the minimum voltage required by the battery pack 100 of the power tool 200 corresponding to the preset range is 2. When the ratio of the maximum voltage to the minimum voltage of the output voltage of the second transformer module 440 is less than or equal to 2, i.e., the ratio of the maximum voltage to the minimum voltage required by the battery packs 100 of the different power tools 200 connected to the charging device 400 at this time is less than 2, the control module 450 controls the operating mode of the second transformer module 440 to maintain the voltage. When the ratio of the maximum voltage to the minimum voltage of the output voltage of the second transformer module 440 is greater than 2, i.e., the ratio of the maximum voltage to the minimum voltage required by the battery packs 100 of the different power tools 200 connected to the charging device 400 at this time is greater than 2, the control module 450 controls the operating mode of the second transformer module 440 to increase the voltage. Optionally, the preset range can also be 1.5, 3, 4, or any other positive number greater than 1, which is not limited in this application.

[0050] In some embodiments, as Figure 7 As shown, the inverter 500 includes a first interface 501 and a second interface 502. The first interface 501 includes a battery connection terminal suitable for connecting to the battery pack 100 of the power tool 200, and is used to connect to the battery pack 100 of the power tool 200. The second interface 502 is used to connect to the load 600. The load 600 can be any electrical device that uses alternating current, and this application does not limit it. The power conversion module 510 in the inverter 500 can convert a DC power supply into an AC power supply. The power conversion module 510 includes a DC-DC module 520 and a DC-AC module 530, and the DC-DC module 520 is connected to the DC-AC module 530. The DC-DC module 520 is used to convert the third DC power into a fourth DC power, wherein the third DC power is the power output by the battery pack 100 of the power tool 200. The DC-AC module 530 is used to convert the fourth DC power into a third AC power to power the load 600.

[0051] In some embodiments, the modules specifically included in DC-DC module 520 are the same as those in DC-DC module 430. The inverter module in DC-DC module 520 first converts the third DC power into AC power. The processing module in DC-DC module 520 then filters and transforms the AC power. Finally, the rectifier module in DC-DC module 520 converts the filtered AC power into a fourth DC power. The specific process by which DC-DC module 520 converts the third DC power into the fourth DC power is similar to the process by which DC-DC module 430 converts the first DC power into the second DC power, as described above, and will not be further described here. Alternatively, DC-DC module 520 can have the same circuit as DC-DC module 430, including a full-bridge resonant LLC.

[0052] In some embodiments, after the DC-DC module 520 converts the third DC power into a fourth DC power, the DC-AC module 530 converts the fourth DC power into a third AC power to power the load 600. The DC-AC module 530 can be identical to the AC-DC module 420 and include a totem pole bridgeless PFC. Thus, the power conversion module 510 in the inverter 500 can be obtained by reversing the current flow of the power conversion module 410 in the charging device 400. By including the totem pole bridgeless PFC in the DC-AC module 530 and the full-bridge resonant LLC in the DC-DC module 520, the output power of the inverter 500 is high, enabling rapid charging of the load 600. The output power of the inverter 500 is greater than or equal to 500W. Alternatively, the output power of the inverter 500 can be 800W. Alternatively, the output power of the inverter 500 can be 1600W. Alternatively, the output power of the inverter 500 can be 2000W. Optionally, the output power of the inverter 500 may be 3300W.

[0053] In some embodiments, as Figure 8 As shown, the charging system 700 includes the battery pack 100 of the power tool 200 and a charging device 800. The charging device 800 includes a first interface and a second interface. The first interface of the charging device 800 is used to connect to an AC power source. The second interface of the charging device 800 includes battery connection terminals suitable for connecting to the battery pack 100 of the power tool 200, and is used to connect to the battery pack 100 of the power tool 200 to charge the battery pack 100. The charging device 800 also includes a power conversion module. The power conversion module includes a first circuit end and a second circuit end. The first circuit end is electrically connected to the first interface, and the second circuit end is electrically connected to the second interface. The power conversion module includes an AC-DC module and a DC-DC module, and the AC-DC module is connected to the DC-DC module. In this case, the power conversion module is a bidirectional power conversion module. The charging device 800 can not only charge the battery pack 100 of the power tool 200, but also be used as an inverter to charge a load. The specific process of charging the battery pack 100 of the power tool 200 by the charging device 800 and charging the load by the charging device 800 as an inverter is as described above in this application and will not be repeated here. Optionally, the AC-DC module includes a totem pole bridgeless PFC, and the DC-DC module includes a full-bridge resonant LLC.

[0054] The above shows and describes the basic principles, main features and advantages of this application. Those skilled in the art should understand that the above embodiments do not limit this application in any form, and any technical solutions obtained by equivalent replacement or equivalent transformation fall within the scope of protection of this application.

Claims

1. A charging device, comprising: The first interface is used to connect to the AC power supply; a second interface comprising battery connection terminals adapted to connect to a battery pack of a power tool; a power conversion module having a first circuit end and a second circuit end, for converting the AC power into a DC power; wherein the first circuit end is electrically connected to the first interface, and the second circuit end is electrically connected to the second interface; Characterized in that the output power of the charging device is greater than or equal to 500W; The power conversion module includes: an AC-DC conversion module for converting the AC power supply into a first DC power, the AC-DC conversion module comprising a totem pole bridgeless power factor correction circuit; A DC-DC conversion module for converting the first DC power into a second DC power is connected to the AC-DC conversion module.

2. The charging device according to claim 1, wherein: The DC-DC conversion module includes: a processing module, an inverter module and a rectifier module. The inverter module and the rectifier module are respectively connected to the processing module. The inverter module converts the first DC power into a first AC power. The processing module converts the first AC power into a second AC power. The rectifier module converts the second AC power into the second DC power.

3. The charging device according to claim 2, wherein: The processing module includes a resonance module and a first voltage transformation module. The resonance module performs filtering processing on the first alternating current, and the first voltage transformation module converts the filtered first alternating current into the second alternating current.

4. The charging device according to claim 3, wherein: The processing module further includes a capacitor module, which includes a plurality of resonant capacitors, and the plurality of resonant capacitors are sequentially connected in parallel on a capacitor circuit board.

5. The charging device according to claim 4, characterized in that The charging device includes a circuit board, and the capacitor circuit board is vertically electrically connected to the circuit board.

6. The charging device according to claim 1, wherein: The charging device further includes a second voltage transformation module for maintaining or increasing voltage, and the second voltage transformation module is connected to the DC-DC conversion module.

7. The charging device according to claim 6, wherein: The charging device further includes a control module, which is connected to the second transformer module and adjusts the working mode of the second transformer module according to the output voltage of the second transformer module.

8. The charging device according to claim 7, wherein: When the output voltage of the second transformer module is less than or equal to a preset range, the control module controls the working mode of the second transformer module to maintain the voltage; when the voltage of the second transformer module is greater than the preset range, the control module controls the working mode of the second transformer module to increase the voltage.

9. The charging device according to claim 1, wherein: The DC-DC conversion module includes a full-bridge resonant LLC.

10. An inverter comprising: a first interface comprising battery connection terminals adapted to connect to a battery pack of a power tool; The second interface is used to access the load; A power conversion module having a first circuit end and a second circuit end, for converting a DC power source into an AC power source; wherein the first circuit end is electrically connected to the first interface, and the second circuit end is electrically connected to the second interface; Characterized in that the output power of the inverter is greater than or equal to 500W; The power conversion module includes: A DC-DC conversion module and a DC-AC conversion module, wherein the DC-AC conversion module is connected to the DC-DC conversion module; after the DC-DC conversion module converts the third DC power into a fourth DC power, the DC-AC conversion module converts the fourth DC power into a third AC power; wherein the DC-AC conversion module includes a totem pole bridgeless power factor correction circuit.

11. The inverter according to claim 10, wherein: The DC-DC conversion module includes a full-bridge resonant LLC.

12. A charging system comprising: A battery pack for a power tool and a charging device for charging the battery pack; Wherein, the charging device includes: The first interface is used to connect to the AC power supply; a second interface comprising a battery connection terminal adapted to connect to a battery pack; A power conversion module having a first circuit end and a second circuit end; wherein the first circuit end is electrically connected to the first interface, and the second circuit end is electrically connected to the second interface; Characterized in that the output power of the charging device is greater than or equal to 500W; The power conversion module includes: An AC-DC conversion module and a DC-DC conversion module, wherein the AC-DC conversion module is connected to the DC-DC conversion module; wherein the AC-DC conversion module includes a totem pole bridgeless power factor correction circuit, and the DC-DC conversion module includes a full-bridge resonant LLC.

13. The charging system according to claim 12, wherein: The power conversion module is a bidirectional power conversion module.

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