Charging circuit board and charger

Abstract

The utility model provides a charging circuit board and a charger. The charging circuit board comprises a circuit substrate and a charging circuit arranged on the circuit substrate. The circuit substrate is provided with a first end and a second end along a first direction, the first end is provided with a metal contact, and the second end is provided with an output interface; the charging circuit comprises an alternating current-direct current conversion circuit and a direct current voltage regulation circuit, the alternating current-direct current conversion circuit is electrically connected with the metal contact and used for converting an alternating current input power supply into a direct current power supply, and the direct current voltage regulation circuit is electrically connected with the output interface and used for converting the direct current power supply into charging output of a target size and outputting the charging output through the output interface.

Description

Technical Field

[0001] The present application relates to the field of charging technology, and in particular to a charging circuit board and a charger. Background Art

[0002] Chargers are a common household device in people's daily lives. They are used in many electronic devices such as mobile phones, computers, and wearable electronic devices.

[0003] With technological advancements, demands for charger size are increasing, placing higher demands on charger power density and the stacking structure of the circuit boards housing the charging circuits. Furthermore, the demand for charging power is also increasing. Existing charger circuit boards are typically designed with high-voltage and low-voltage components deployed on separate boards, resulting in two or more boards. However, this circuit board design is complex and difficult to assemble, hindering the miniaturization of chargers. Utility Model Content

[0004] In order to solve the existing technical problems, the present application provides a charging circuit board and a charger with a single-board design that has a simple process and reduces the difficulty of assembly.

[0005] In a first aspect, a charging circuit board is provided, comprising a circuit substrate and a charging circuit provided on the circuit substrate;

[0006] The circuit substrate has a first end and a second end along a first direction, the first end is provided with a metal contact, and the second end is provided with an output interface;

[0007] The charging circuit includes an AC-DC conversion circuit and a DC voltage regulation circuit. The AC-DC conversion circuit is electrically connected to the metal contact and is used to convert the AC input power into a DC power. The DC voltage regulation circuit is electrically connected to the output interface and is used to convert the DC power into a charging output of a target size, which is output through the output interface.

[0008] Optionally, the circuit substrate includes a plug-in surface and a welding surface; the metal contacts are arranged on the plug-in surface or the welding surface, and the output interface is arranged on the plug-in surface; the AC-DC conversion circuit also includes a main control chip arranged on the welding surface and a transformer arranged on the plug-in surface.

[0009] Optionally, the AC / DC conversion circuit further includes a filter circuit assembly provided on the primary side of the transformer; the filter circuit assembly includes a plurality of filter capacitors provided on the plug-in surface, and the filter capacitors and the transformer are arranged in parallel along the first direction.

[0010] Optionally, the transformer is spaced apart from the plug-in surface, thereby forming an overlapping space between the transformer and the plug-in surface; the output interface is arranged in the overlapping space, and the interface connection side of the output interface protrudes out of the edge of the circuit substrate.

[0011] Optionally, the circuit substrate is provided with a mounting groove and an isolating member installed in the mounting groove; the isolating member protrudes from the plug-in surface to form a partition portion, the transformer is arranged on the partition portion, the isolating member protrudes from the welding surface to form an isolation portion, and the isolation portion separates the welding surface into a high-voltage area and a low-voltage area.

[0012] Optionally, the partition includes a supporting portion and a connecting portion, the supporting portion is spaced apart from the plug-in surface, and the connecting portion is connected between the supporting portion and the plug-in surface; the transformer is mounted on the supporting portion; and the isolation portion is connected to an end of the connecting portion away from the supporting portion.

[0013] Optionally, the DC voltage regulation circuit includes a rectifier MOS tube arranged in the superposition space; and / or, the DC voltage regulation circuit includes an output interface MOS tube arranged in the superposition space and electrically connected to the output interface; and / or, the DC voltage regulation circuit includes a chip capacitor arranged in the superposition space and electrically connected to the output interface.

[0014] Optionally, the AC / DC conversion circuit further includes a Y capacitor arranged across the primary and secondary of the transformer; the Y capacitor is arranged on the plug-in surface and located in the superposition space.

[0015] Optionally, the DC voltage regulation circuit also includes a filtering solid-state capacitor electrically connected to the output interface; the filtering solid-state capacitor is arranged on the plug-in surface and is located in the superposition space; the filtering solid-state capacitor, the transformer and the Y capacitor are arranged in parallel along a second direction perpendicular to the first direction.

[0016] Optionally, the AC-DC conversion circuit further includes a rectifier bridge, which is provided on the welding surface, and the rectifier bridge and the main control chip are arranged in parallel along a second direction perpendicular to the first direction.

[0017] Optionally, the AC-DC conversion circuit further includes a chip inductor connected to the output side of the rectifier bridge; the chip inductor and the main control chip are arranged in parallel along the first direction.

[0018] Optionally, the DC voltage regulation circuit also includes a voltage regulation chip and a protocol chip; the voltage regulation chip and the protocol chip are arranged on the welding surface and arranged in parallel along a second direction perpendicular to the first direction; the protocol chip is located at a position on the welding surface corresponding to the output interface.

[0019] In a second aspect, a charger is also provided, including:

[0020] The housing comprises a base and a cover, wherein the base and the cover together form a storage space, the base is provided with a pin and a clamping portion, and the cover is provided with a charging port;

[0021] As described in any embodiment of the present application, the second end of the charging circuit board is clamped in the clamping portion and housed in the housing, the metal contact is electrically connected to the pin through the clamping portion, and the output interface is aligned with the charging port.

[0022] In the charging circuit board provided in the above embodiment, the charging circuit is integratedly arranged on a single circuit substrate. Metal contacts and output interfaces are respectively provided at the first and second opposite ends of the circuit substrate. The metal contacts are used to receive external mains power as the AC input power supply of the AC-DC conversion circuit. The DC voltage regulation circuit regulates and converts the DC power output by the AC-DC conversion circuit to obtain a charging output of a target size, which is output to the device to be charged through the output interface for charging. In this way, the first end of the circuit substrate where the metal contacts are provided can be mainly deployed as the high-voltage area of ​​the charging circuit board, while the second end where the output interface is provided can be mainly deployed as the low-voltage area of ​​the charging circuit board. This can maximize the safety distance between the high- and low-voltage circuit components in the charging circuit. On the premise that the AC-DC conversion circuit and the DC voltage regulation circuit are provided on the same circuit substrate, the spatial deployment between the circuit components on the circuit substrate can be optimized to maintain the small size of the charger. In addition, the design of a single circuit substrate can eliminate complex processes and reduce assembly difficulty.

[0023] In the above embodiments, the charger and the corresponding charging circuit board embodiment are of the same concept, and thus have at least the same technical effects as the charging circuit board embodiment, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the three-dimensional structure of a charging circuit board in one embodiment.

[0025] Figure 2 FIG. 1 is a schematic structural diagram of a charging circuit in one embodiment.

[0026] Figure 3 for Figure 1 Schematic diagram of the plug-in surface of the charging circuit board.

[0027] Figure 4 for Figure 1 Schematic diagram of the soldering surface of the charging circuit board.

[0028] Figure 5Schematic diagram of the three-dimensional structure of the isolation element in one embodiment.

[0029] Figure 6 for Figure 5 A schematic three-dimensional structural diagram of the isolation member from another angle.

[0030] Figure 7 for Figure 1 Schematic diagram of the three-dimensional structure of the charging circuit board after removing the transformer.

[0031] Figure 8 Schematic diagram of the three-dimensional structure of a charger in one embodiment.

[0032] Figure 9 for Figure 8 A schematic diagram of the charger from another angle is shown.

[0033] Figure 10 for Figure 8 Schematic diagram of the internal structure of the charger with the shell removed and the charging circuit board without the transformer.

[0034] Figure 11 for Figure 10 Exploded diagram of the internal structure shown.

[0035] Component Symbol Description:

[0036] Charger 100, housing 10, base 11, cover 13, charging port 131, pin 14, clamping portion 15, charging circuit board 20, circuit substrate 21, welding surface 211, plug-in surface 212, metal contacts 214, AC / DC conversion circuit 22, DC voltage regulation circuit 23, isolator 24, isolating portion 241, partition 25, support portion 251, connection portion 252, overlapping space 253, mounting slot 26, high-voltage area 271, low-voltage area 272, output interface 29;

[0037] Main control chip U2, voltage regulation chip U3, protocol chip U5, transformer T1, Y capacitor CY1, filter capacitors C4, C5, filter solid-state capacitor C14, rectifier bridge DB1, chip inductor L2, rectifier MOS tube Q2, output interface MOS tube Q1, chip capacitors C17, C18. DETAILED DESCRIPTION

[0038] The technical solution of the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] In order to make the purpose, technical solutions and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. The described embodiments should not be regarded as limiting this application. All other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0040] In the following description, the expression "some embodiments" is involved, which describes a subset of all possible embodiments. It should be noted that "some embodiments" may be the same subset or different subsets of all possible embodiments, and may be combined with each other without conflict.

[0041] In the following description, the terms "first, second, and third" are merely used to distinguish similar objects and do not represent a specific ordering of the objects. It is understandable that "first, second, and third" can be interchanged with a specific order or sequence where permitted, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0042] See also Figures 1 to 4 The charging circuit board 20 provided in one embodiment of the present application includes a circuit substrate 21 and a charging circuit disposed on the circuit substrate 21. The circuit substrate 21 has a first end and a second end along a first direction. The first end is provided with a metal contact 214. The second end of the circuit substrate 21, away from the metal contact 214, is provided with an output interface 29. The charging circuit includes an AC / DC conversion circuit 22 and a DC voltage regulation circuit 23. The AC / DC conversion circuit 22 is electrically connected to the metal contact 214 and is configured to convert an AC input power source 28 into a DC power source. The DC voltage regulation circuit 23 is electrically connected to the output interface 29 and is configured to convert the DC power source into a target charging output, which is outputted through the output interface 29.

[0043] The term "charging output" refers to at least one of the following: charging voltage, charging current, and charging power. The AC / DC conversion circuit 22 includes high-voltage circuit components for receiving an AC input power source 28 and converting it into a DC power source. The DC voltage regulator circuit 23 primarily includes low-voltage circuit components for converting the DC power source into a target DC output voltage. It should be noted that the metal contacts 214 refer to the conductive properties of the charging circuit board 20 through which it is electrically connected to the mains, and are not intended to limit their shape. For example, the shapes of the metal contacts 214 include, but are not limited to, points, rectangular sheets, and the like.

[0044] In the above embodiment, the charging circuit is integrated onto a single circuit substrate 21. Metal contacts 214 and output interfaces 29 are provided at opposing first and second ends of the circuit substrate 21, respectively. The metal contacts 214 are used to receive external AC power as the AC input power 28 for the AC / DC conversion circuit 22. The DC voltage regulator 23 then converts the AC power to a target charging output, which is output to the device to be charged, via the output interface 29. Thus, the first end of the circuit substrate 21, where the metal contacts 214 are provided, can be primarily deployed as the high-voltage area of ​​the charging circuit board 20, while the second end, where the output interface 29 is provided, can be primarily deployed as the low-voltage area of ​​the charging circuit board 20. This maximizes the safety distance between the high- and low-voltage circuit components in the charging circuit. While ensuring that the AC / DC conversion circuit 22 and the DC voltage regulator 23 are provided on the same circuit substrate 21, the spatial arrangement of the circuit components on the circuit substrate 21 can be optimized to maintain the compact size of the charger. Furthermore, the design of a single circuit substrate 21 eliminates complex processes and reduces assembly difficulty.

[0045] In some embodiments, the circuit substrate 21 includes a plug-in surface 212 and a welding surface 211; the metal contacts 214 can be provided on the plug-in surface 212 or the welding surface 211, or can be provided on both the plug-in surface 212 and the welding surface 211; the output interface 29 is provided on the plug-in surface 212; the AC / DC conversion circuit 22 also includes a main control chip U2 provided on the welding surface 211 and a transformer T1 provided on the plug-in surface 212. The main control chip U2 is a power management chip that can integrate multiple protection functions such as over-temperature protection, over-voltage protection, over-current protection, and output circuit protection in charging management. In an optional example, the main control chip U2 is a chip model SC3056. The transformer T1, as the main power conversion device in the AC / DC conversion circuit 22, converts a certain value of AC power into another value of AC power of the same frequency, thereby realizing the conversion of AC high voltage to low voltage. The main control chip U2 and the transformer T1 are respectively arranged on the plug-in surface 212 and the welding surface 211 of the circuit substrate 21, and are located at one end of the circuit substrate 21 relatively close to the metal contact 214. The pins of the transformer T1 can pass through the circuit substrate 21 and be welded on the plug-in surface 212, which can more conveniently realize the electrical connection between the input / output of the transformer T1 in the AC / DC conversion circuit 22 and other circuit components arranged on the plug-in surface 212, thereby optimizing the line connection and more stable performance.

[0046] In the embodiments of the present application, for ease of description and understanding, the direction in which the first and second ends of the circuit substrate 21, where the metal contacts 214 and the output interface 29 are respectively provided, are arranged is referred to as the first direction, and the direction perpendicular to the first direction is referred to as the second direction. In a specific example, the first direction refers to the length direction of the circuit substrate 21, and the second direction refers to the width direction of the circuit substrate 21.

[0047] Optionally, the AC / DC conversion circuit 22 further includes a filter circuit assembly provided on the primary side of the transformer T1. The filter circuit assembly includes a plurality of filter capacitors C4 and C5 provided on the plug-in surface 212, and the filter capacitors C4 and C5 are arranged in parallel with the transformer T1 along the first direction. As the larger high-voltage components in the charging circuit, the filter capacitors C4 and C5 are provided on the side of the transformer T1 adjacent to the circuit substrate 21 where the metal contact 214 is provided. The filter capacitors C4 and C5 are arranged in parallel with the transformer T1 along the first direction, which can fully utilize the height of the assembly space required for the installation of the transformer T1 on the plug-in surface 212 to complete the assembly of the filter capacitors C4 and C5, optimize space utilization, and facilitate the realization of the basic design of the single circuit substrate 21, while ensuring strong performance and maintaining the small size of the charging circuit board 20 that is more suitable for the charger.

[0048] In some embodiments, the transformer T1 is spaced apart from the insertion surface 212, thereby forming an overlapping space 253 between the transformer T1 and the insertion surface 212. The output interface 29 is disposed within the overlapping space 253, with the interface connection side of the output interface 29 protruding beyond the edge of the circuit substrate 21. The elevated design of the transformer T1 relative to the insertion surface 212 of the circuit substrate 21 creates the overlapping space 253 between the transformer T1 and the circuit substrate 21. This effectively reuses the surface area of ​​the circuit substrate 21 corresponding to the area of ​​the overlapping space 253 for the assembly of circuit components in the charging circuit. This further facilitates maintaining high performance while maintaining the compact size of the charging module adapter charger within the basic design of a single circuit board. The output interface 29 is disposed within the overlapping space 253, providing support for the elevated configuration of the transformer T1 and fully utilizing the overlapping space 253 to optimize the placement of the output interface 29 on the circuit substrate 21. In an optional embodiment, the output interface 29 is a Type-C connector.

[0049] Optionally, the circuit substrate 21 is provided with a mounting groove 26 and an isolating member 24 mounted within the mounting groove 26. The isolating member 24 protrudes from the insertion surface 212 to form a partition 25, and the transformer T1 is mounted on the partition 25. Simultaneously, the isolating member 24 protrudes from the welding surface 211 to form an isolating member 241. The isolating member 241 separates the welding surface 211 into a high-voltage region 271 and a low-voltage region 272. The isolating member 24 is made of a non-conductive material such as plastic or rubber and can be quickly installed on the circuit substrate 21 by being inserted into the mounting groove 26. The isolating member 241 is used to separate the high-voltage region 271 and the low-voltage region 272. The safety distance between the circuit components within the high-voltage region 271 and the circuit components within the low-voltage region 272 includes the distance along the height of the isolating member 241 protruding from the welding surface 211, thereby increasing the safety distance when the linear distance between the circuit components is small. The use of the separator 25 to provide an overhead arrangement of the transformer T1 relative to the insertion surface 212 of the circuit substrate 21 is beneficial for simplifying the structure of the charging circuit board, reducing the number of assembly steps, and also contributing to the stability of the overall structure.

[0050] Optional, please refer to Figure 5 and Figure 6 The separator 25 includes a support portion 251 and a connection portion 252. The support portion 251 is spaced apart from the insertion surface 212, and the connection portion 252 is connected between the support portion 251 and the insertion surface 212. The transformer T1 is mounted on the support portion 251. The isolation portion is connected to an end of the connection portion 252 away from the support portion 251. In this embodiment, the support portion 251 is flat and parallel to and spaced apart from the circuit substrate 21. The connection portion 252 includes connecting sidewalls extending perpendicularly from opposite edges of the support portion 251 to form the overlapping space 253 between the support portion 251 and the circuit substrate 21.

[0051] In some embodiments, see Figure 7 The DC voltage regulator circuit 23 includes multiple low-voltage circuit components disposed within the stacking space 253. While utilizing the stacking space 253 to reuse the installation space for more circuit components, it also facilitates full utilization of the stacking space 253 for the installation of large-volume circuit components associated with the output interface 29. Optionally, the low-voltage circuit components disposed within the stacking space 253 may include at least one of the following: a rectifier MOS transistor Q2, an output interface MOS transistor Q1 electrically connected to the output interface 29, and chip capacitors C17 and C18 electrically connected to the output interface 29.

[0052] In some embodiments, the AC / DC conversion circuit 22 further includes a Y capacitor CY1 disposed between the primary and secondary terminals of the transformer T1. The Y capacitor CY1 is disposed on the plug-in surface 212 and within the superposition space 253. The Y capacitor CY1 can reduce noise in the power supply output through its filtering characteristics, ensuring stable charging output. The Y capacitor CY1, another relatively large high-voltage component in the AC / DC conversion circuit 22, is disposed on the plug-in surface 212 and within the superposition space 253 formed between the transformer T1 and the circuit substrate 21. Specifically, the Y capacitor CY1 is disposed below the transformer T1 and near a side edge of the circuit substrate 21. The Y capacitor CY1 and the transformer T1 are superimposed on the plug-in surface 212 of the circuit substrate 21 in a direction perpendicular to the plug-in surface 212. This fully utilizes the superposition space 253 to optimize the placement of the Y capacitor CY1 on the circuit substrate 21. This facilitates achieving the basic design of a single circuit substrate 21 while ensuring strong performance while maintaining the small size of the charging circuit board 20 adapted to the charger.

[0053] Optionally, the DC voltage regulation circuit 23 also includes a filter solid-state capacitor C14 electrically connected to the output interface 29; the filter solid-state capacitor C14 is provided on the plug-in surface 212 and is located within the superposition space 253; the filter solid-state capacitor C14, the transformer T1, and the Y capacitor CY1 are arranged in parallel along the second direction. The filter solid-state capacitor C14 is a relatively large low-voltage component in the DC voltage regulation circuit 23 and is used for synchronous rectification output filtering on the secondary side of the transformer T1 to improve the purity of the charging output. In this embodiment, the filter solid-state capacitor C14 is a chip capacitor and is arranged in parallel with the transformer T1 and the Y capacitor CY1 along the second direction. The height of the assembly space required for the installation of the transformer T1 on the plug-in surface 212 can be fully utilized to complete the assembly of the filter solid-state capacitor C14 and the Y capacitor CY1, thereby optimizing space utilization.

[0054] In some embodiments, the AC / DC conversion circuit 22 further includes a rectifier bridge DB1, which is disposed on the welding surface 211. The rectifier bridge DB1 and the main control chip U2 are arranged side by side along the second direction. As a relatively large high-voltage component in the AC / DC conversion circuit 22, the rectifier bridge DB1 converts the voltage and current waveforms of the AC power into unidirectional DC power, making it suitable for electronic devices to be charged that require a DC power supply. The rectifier bridge DB1 and the main control chip U2 are arranged side by side along the second direction on the welding surface 211 of the circuit substrate 21, and are located relatively closer to the first end of the circuit substrate 21 where the metal contact 214 is provided. This allows for more compact assembly of the high-voltage circuit components on the circuit substrate 21, and minimizes the surface area required to assemble all circuit components in the charging circuit on a single circuit substrate 21.

[0055] Optionally, the AC / DC conversion circuit 22 further includes a chip inductor L2 connected to the output side of the rectifier bridge DB1; the chip inductor L2 and the main control chip U2 are arranged in parallel along the first direction. The chip inductor L2 is electrically connected to the output side of the rectifier bridge DB1, which can improve the electromagnetic compatibility of the circuit. In an optional specific example, the chip inductor L2 is 2.2μH. The chip inductor L2 can filter and suppress conductive interference, and thereby replace the common-mode inductor provided between the output side of the rectifier bridge DB1 and the primary side of the transformer T1 in the charging circuit. In the implementation scheme in which the common-mode inductor is eliminated, the chip inductor L2 and the main control chip U2 are arranged in parallel in the first direction. The assembly space required for the chip inductor L2 on the circuit substrate 21 can be greatly reduced compared to the common-mode inductor, thereby solving the problems caused by the common-mode inductor, such as the need to occupy a large assembly space and the susceptibility to inductor failure, and better solving the electromagnetic interference problem.

[0056] Optionally, the DC voltage regulation circuit 23 further includes a voltage regulation chip U3 and a protocol chip U5; the voltage regulation chip U3 and the protocol chip U5 are disposed on the welding surface 211 and arranged side by side along the second direction; the protocol chip U5 is located at a position on the welding surface 211 corresponding to the output interface 29. The protocol chip U5 and the output interface 29 are respectively located on the welding surface 211 and the plug-in surface 212 of the circuit substrate 21, and the protocol chip U5 is located directly opposite the output interface 29, so that electrical connection can be achieved through plug-in welding. The protocol chip U5 has the ability to detect equipment and identify cables. It determines the insertion status of the electronic device to be charged and whether the connection of the charging cable is normal through feedback from the detection signal. It can automatically adjust the charging output voltage and current according to the needs of the electronic device to be charged to ensure safe and stable charging. If an abnormality occurs in the electronic device to be charged or the cable, the protocol chip U5 will take timely protective measures to prevent damage to the device. In this embodiment, the protocol chip U5 can determine the charging protocol adapted to the corresponding electronic device to be charged based on the charging type supported by the electronic device to be charged currently connected to the output interface 29. The charging module outputs a DC output voltage of the target size through the output interface 29 according to the adapted charging protocol to charge the electronic device to be charged.

[0057] See also Figures 8 to 11On the other hand, the present application provides a charger 100, comprising: a housing 10, including a base 11 and a shell cover 13, wherein the base 11 and the shell cover 13 together form a storage space, the base 11 is provided with a pin 14 and a clamping portion 15, and the shell cover 13 is provided with a charging port 131; a charging circuit board 20 such as any embodiment of the present application, wherein the second end of the charging circuit board 20 is clamped in the clamping portion 15 and stored in the housing 11, the metal contact 214 is electrically connected to the pin 14 through the clamping portion 15, and the output interface 29 is aligned with the charging port 131. During use, the charger 100 can be electrically connected to a mains socket via the pin 14, thereby obtaining mains power as the AC input power 28 of the charging circuit board 20. The charging circuit board 20 converts the AC power and outputs it to the electronic device to be charged through the output interface 29, thereby charging the electronic device to be charged.

[0058] The above are only specific embodiments of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A charging circuit board, characterized in that: It includes a circuit substrate and a charging circuit provided on the circuit substrate; The circuit substrate has a first end and a second end along a first direction, the first end is provided with a metal contact, and the second end is provided with an output interface; The charging circuit includes an AC-DC conversion circuit and a DC voltage regulation circuit. The AC-DC conversion circuit is electrically connected to the metal contact and is used to convert the AC input power into a DC power. The DC voltage regulation circuit is electrically connected to the output interface and is used to convert the DC power into a charging output of a target size, which is output through the output interface.

2. The charging circuit board according to claim 1, wherein: The circuit substrate includes an inserting surface and a welding surface; The metal contact is provided on the plug-in surface or the welding surface, and the output interface is provided on the plug-in surface; The AC / DC conversion circuit further includes a main control chip arranged on the welding surface and a transformer arranged on the plug-in surface.

3. The charging circuit board according to claim 2, wherein: The AC / DC conversion circuit further includes a filter circuit component provided on the primary side of the transformer; The filter circuit assembly includes a plurality of filter capacitors arranged on the plug-in surface, and the filter capacitors and the transformer are arranged in parallel along the first direction.

4. The charging circuit board according to claim 2, wherein: The transformer is spaced apart from the plug-in surface, so that an overlapping space is formed between the transformer and the plug-in surface; The output interface is arranged in the superimposed space, and an interface connection side of the output interface protrudes out of the edge of the circuit substrate.

5. The charging circuit board according to claim 4, wherein: The circuit substrate is provided with a mounting groove and an isolating member installed in the mounting groove; The isolating member protrudes from the plug-in surface to form a partition, the transformer is arranged on the partition, the isolating member protrudes from the welding surface to form an isolation portion, and the isolation portion separates the welding surface into a high-voltage area and a low-voltage area.

6. The charging circuit board according to claim 5, wherein: The partition portion includes a supporting portion and a connecting portion, wherein the supporting portion is spaced apart from the plug-in surface, and the connecting portion is connected between the supporting portion and the plug-in surface; The transformer is mounted on the support portion; The isolation portion is connected to an end of the connection portion away from the support portion.

7. The charging circuit board according to claim 4, wherein: The DC voltage regulation circuit includes a rectifier MOS tube arranged in the superposition space; and / or, The DC voltage regulating circuit includes an output interface MOS transistor arranged in the superposition space and electrically connected to the output interface; and / or, The DC voltage regulation circuit includes a chip capacitor arranged in the superposition space and electrically connected to the output interface.

8. The charging circuit board according to claim 4, wherein: The AC / DC conversion circuit further includes a Y capacitor arranged between the primary and secondary sides of the transformer; The Y capacitor is arranged on the plug-in surface and is located in the overlapping space.

9. The charging circuit board according to claim 8, wherein: The DC voltage regulation circuit further includes a filtering solid-state capacitor electrically connected to the output interface; The filtering solid-state capacitor is provided on the plug-in surface and is located in the superposition space; The filtering solid-state capacitor, the transformer and the Y capacitor are arranged in parallel along a second direction perpendicular to the first direction.

10. The charging circuit board according to claim 2, wherein: The AC / DC conversion circuit further includes a rectifier bridge, which is arranged on the welding surface. The rectifier bridge and the main control chip are arranged in parallel along a second direction perpendicular to the first direction.

11. The charging circuit board according to claim 10, wherein: The AC / DC conversion circuit further includes a chip inductor connected to the output side of the rectifier bridge; The chip inductor and the main control chip are arranged in parallel along the first direction.

12. The charging circuit board according to claim 2, wherein: The DC voltage regulation circuit also includes a voltage regulation chip and a protocol chip; The voltage regulating chip and the protocol chip are arranged on the welding surface and arranged in parallel along a second direction perpendicular to the first direction; The protocol chip is located at a position on the welding surface corresponding to the output interface.

13. A charger, characterized in that: include: The housing comprises a base and a cover, wherein the base and the cover together form a storage space, the base is provided with a pin and a clamping portion, and the cover is provided with a charging port; The charging circuit board according to any one of claims 1 to 12, wherein the second end of the charging circuit board is clamped in the clamping portion and housed in the housing, the metal contact is electrically connected to the pin through the clamping portion, and the output interface is aligned with the charging port.

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