Charger

Abstract

The utility model provides a charger, and belongs to the technical field of power supplies. The charger comprises a first circuit board, a second circuit board and an electric connecting piece, signal transmission is carried out between the first circuit board and the second circuit board through the electric connecting piece, a transformer is arranged on the first circuit board, a secondary winding of the transformer is connected with a corresponding terminal of the electric connecting piece, and a secondary winding of the transformer is connected with a corresponding terminal of the electric connecting piece. The second circuit board is provided with a secondary side output circuit, the input end of the secondary side output circuit is connected with the secondary winding through a corresponding terminal of the electric connecting piece, and the output end of the secondary side output circuit is connected with a charging end. And the secondary side output circuit is used for rectifying the voltage output by the secondary winding into direct-current voltage and outputting the direct-current voltage to the charging end. The charger is small in size and convenient to carry.

Description

Technical Field

[0001] This application relates to the technical field of power supplies, and particularly to a charger. Background Art

[0002] With the popularization of various electronic products, the demand for chargers matching various electronic products has also increased significantly. Chargers are widely used in various fields, especially in the field of daily life, and are widely used for common electronic products such as mobile phones, watches, laptops, headphones, and so on. Since people's requirements for the performance of electronic products such as portability are getting higher and higher, the volume of chargers is also developing in the direction of miniaturization. Therefore, minimizing the volume of chargers as much as possible is the requirement for charger designers and producers in the industry.

[0003] Currently, the main layout method of electronic components in chargers on the market is that all electronic components are arranged on a single piece of PCB board, and there must be a certain safety distance between the electronic components on the high-voltage side and the low-voltage side. Therefore, existing chargers have problems such as large size and inconvenience in carrying around. Utility Model Content

[0004] To solve the existing technical problems, this application provides a charger that is small in size and convenient to carry.

[0005] A charger includes a first circuit board, a second circuit board, and an electrical connector. Signal transmission is carried out between the first circuit board and the second circuit board through the electrical connector.

[0006] A transformer is provided on the first circuit board, and the secondary winding of the transformer is connected to the corresponding terminals of the electrical connector.

[0007] A secondary-side output circuit is provided on the second circuit board. The input end of the secondary-side output circuit is connected to the secondary winding through the corresponding terminals of the electrical connector, and the output end of the secondary-side output circuit is connected to the charging end. The secondary-side output circuit is used to rectify the voltage output by the secondary winding into a DC voltage and output it to the charging end.

[0008] Optionally, the electrical connector includes pin headers, and the pin headers are respectively connected to the first circuit board and the second circuit board. Signal transmission is carried out between the first circuit board and the second circuit board through the pin headers.

[0009] Optionally, the electrical connector further includes a pin header socket that cooperates with the pin headers. The pin header socket is provided on one of the first circuit board and the second circuit board. One end of the pin header is connected to the other of the first circuit board and the second circuit board, and the other end of the pin header is used to insert into the jack of the pin header socket.

[0010] Optionally, the pin header is connected to the first circuit board and / or the second circuit board by soldering.

[0011] Optionally, the first circuit board and the second circuit board are stacked.

[0012] Optionally, a power switch and a drive circuit are further provided on the first circuit board;

[0013] The power switch is connected to the primary winding of the transformer, the output end of the drive circuit is connected to the switch control end of the power switch, and the output end of the drive circuit is connected to the corresponding terminal in the electrical connector;

[0014] A charging protocol chip is further provided on the second circuit board, and the output end of the charging protocol chip is connected to the input end of the drive circuit through the corresponding terminal in the electrical connector.

[0015] Optionally, an isolation optocoupler is further provided on the first circuit board;

[0016] The input end of the isolation optocoupler is connected to the output end of the charging protocol chip through the corresponding terminal in the electrical connector, and the output end of the isolation optocoupler is connected to the input end of the drive circuit.

[0017] Optionally, a Y capacitor is further provided on the first circuit board, and the Y capacitor is connected across the auxiliary winding of the transformer and the ground terminal of the secondary winding.

[0018] Optionally, the secondary side output circuit includes a secondary side rectifier filter circuit and a DC-DC conversion circuit. The secondary side rectifier filter circuit is used to rectify the voltage output by the secondary winding to output a first DC voltage;

[0019] The DC-DC conversion circuit is respectively connected to the output end of the secondary side rectifier filter circuit, the charging end, and the charging protocol chip, and is used to convert the first DC voltage into a second DC voltage according to the control of the charging protocol chip and output it to the charging end.

[0020] Optionally, a primary side input circuit connected to the primary winding of the transformer is further provided on the first circuit board. The primary side input circuit includes a fuse, an X capacitor, an EMI circuit, and a primary side rectifier filter circuit connected in sequence between the AC input end and the primary winding of the transformer.

[0021] As can be seen from the above, in the charger provided in the embodiment of the present application, the transformer is arranged on the first circuit board, and the secondary side output circuit connected to the secondary winding of the transformer is arranged on the second circuit board. That is, the high-voltage side electronic components and the low-voltage side electronic components of the charger are respectively arranged on different circuit boards, which is beneficial to ensuring high-voltage isolation. At the same time, different circuit boards can be stacked or arranged in different spatial directions within the charger housing, with high space utilization rate, which is beneficial to reducing the volume of the charger and improving the portability of the charger. Description of the Drawings

[0022] The drawings are only used to illustrate the embodiments and are not considered to limit the present invention. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0023] Figure 1 is a schematic diagram of the planar layout of the circuit board of the charger provided according to some embodiments of the present application;

[0024] Figure 2 is a schematic diagram of the spatial layout of the circuit board of the charger provided according to some embodiments of the present application;

[0025] Figure 3 is a schematic diagram of the planar layout of the circuit board of the charger provided according to some other embodiments of the present application. Detailed Embodiments

[0026] The technical solution of the present application will be further elaborated in detail below in conjunction with the drawings of the specification and specific embodiments.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. The terms used herein in the description of the present application are only for the purpose of describing specific embodiments and are not intended to limit the implementation of this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0028] In the following description, the expression "some embodiments" is mentioned, which describes a subset of possible embodiments. However, it should be understood that "some embodiments" can be the same subset or different subsets of all possible embodiments and can be combined with each other without conflict.

[0029] Please refer to Figure 1As shown, it is a schematic diagram of the planar layout of the circuit board of a charger provided according to some embodiments of the present application. The charger provided by the embodiments of the present application includes a first circuit board 1, a second circuit board 2, and an electrical connector 3. Signal transmission between the first circuit board 1 and the second circuit board 2 is carried out through the electrical connector 3. A transformer 16 is provided on the first circuit board 1, and the secondary winding of the transformer 16 is connected to the corresponding terminal of the electrical connector 3. A secondary-side output circuit 20 is provided on the second circuit board 2. The input end of the secondary-side output circuit 20 is connected to the secondary winding of the transformer 16 through the corresponding terminal of the electrical connector 3, and the output end of the secondary-side output circuit 20 is connected to the charging end 23. The secondary-side output circuit 20 is used to rectify the voltage output by the secondary winding of the transformer 16 into a DC voltage and output it to the charging end. Specifically, the secondary-side output circuit 20 can rectify the voltage output by the secondary winding into a first DC voltage and output the first DC voltage to the charging end 23, or convert the first DC voltage into a second DC voltage and output the second DC voltage to the charging end 23.

[0030] The first circuit board 1 and the second circuit board 2 may specifically refer to PCB boards. The electrical connector 3 is provided between the first circuit board 1 and the second circuit board 2 for realizing the electrical connection between the first circuit board 1 and the second circuit board 2, that is, the corresponding electronic components in the first circuit board 1 and the second circuit board 2 are all connected through the electrical connector 3. The electrical connector 3 includes a plurality of terminals. The electronic components on the first circuit board 1 that need to be electrically connected to the corresponding electronic components on the second circuit board 2 are respectively connected to the corresponding terminals in the electrical connector 3, and the electronic components on the second circuit board 2 that need to be electrically connected to the corresponding electronic components on the first circuit board 1 are respectively connected to the corresponding terminals in the electrical connector 3. It should be noted that in the present application, A is connected to the corresponding terminal in the electrical connector 3 means that A is connected to the terminal corresponding to A in the electrical connector 3.

[0031] The primary winding of the transformer 16 is connected to the output end of the primary-side input circuit 10 of the charger, and the input end of the primary-side input circuit 10 is connected to the AC input end 11 of the charger. In some embodiments, the primary-side input circuit 10 is also provided on the first circuit board 1. The alternating current input by the AC input end 11 is rectified and filtered by the primary-side input circuit 10 and then output to the primary-side winding of the transformer 16 for voltage transformation by the transformer 16. The secondary winding of the transformer 16 outputs the transformed voltage, and this voltage is then rectified into a first DC voltage by the secondary-side output circuit 20. Further, the secondary-side output circuit 20 directly outputs the first DC voltage to the charging end 23 of the charger and / or converts the first DC voltage into a second DC voltage and outputs the second DC voltage to the charging end 23 to charge the device to be charged connected to the charging end 23. The device to be charged can be a mobile phone, a laptop computer, an earphone, a watch, etc.

[0032] As can be seen from the above, the transformer 16 in the charger provided by the embodiment of the present application is disposed on the first circuit board 1, and the secondary side output circuit 20 connected to the secondary winding of the transformer 16 is disposed on the second circuit board 2. The high-voltage side electronic components and the low-voltage side electronic components of the charger are respectively arranged on different circuit boards, which is beneficial to ensuring high-voltage isolation. At the same time, the different circuit boards can be stacked or arranged in different spatial directions within the charger housing, with high space utilization rate, which is beneficial to reducing the volume of the charger and improving the portability of the charger.

[0033] Please continue to refer to Figure 1 As shown, in some embodiments, the electrical connector 3 includes pin headers 31. The pin headers 31 are respectively connected to the first circuit board 1 and the second circuit board 2, and the first circuit board 1 and the second circuit board 2 transmit signals through the pin headers 31. The number of pin headers 31 includes multiple. Each pin header 31 corresponds to a terminal in the electrical connector 3. One end of each pin header 31 is connected to the first circuit board 1, and the other end is connected to the second circuit board 2. The connection manner between the pin headers 31 and the first circuit board 1 and the second circuit board 2 can be welding or other connection manners. Hard electrical connection between the first circuit board 1 and the second circuit board 2 through the pin headers 31 is easy to implement and has better stability.

[0034] Please continue to refer to Figure 1 As shown, in this embodiment, the electrical connector 3 further includes a female pin header 32 that cooperates with the pin headers 31. The female pin header 32 is disposed on one of the first circuit board 1 and the second circuit board 2. One end of the pin header 31 is connected to the other of the first circuit board 1 and the second circuit board 2, and the other end of the pin header 31 is used to insert into the jack of the female pin header 32. The pin headers 31 and the female pin header 32 are used to achieve electrical connection between the first circuit board 1 and the second circuit board 2 in a plug-in connection manner, which is convenient for disassembly, maintenance, and replacement of the first circuit board 1 and the second circuit board 2. The cooperation between the female pin header 32 and the pin headers 31 means that the female pin header 32 has jacks corresponding to the pin headers 31. Further, the pin headers 31 are disposed on a male seat 33, the female pin header 32 is disposed on one of the first circuit board 1 and the second circuit board 2, and the male seat 33 is disposed on the other of the first circuit board 1 and the second circuit board 2. One end of the pin header 31 is connected to the other of the first circuit board 1 and the second circuit board 2 through the male seat 33. In other embodiments, one end of the pin header 31 can also be directly connected to the other of the first circuit board 1 and the second circuit board 2, such as by welding, that is, the pin header 31 is connected to the first circuit board 1 and / or the second circuit board 2 by welding to enhance the stability of the electrical connection.

[0035] Please refer to Figure 2As shown, it is a schematic diagram of the spatial layout of the circuit board in the charger provided according to the embodiments of the present application. In some embodiments, the first circuit board 1 and the second circuit board 2 are stacked. The stacking of the first circuit board 1 and the second circuit board 2 can be that one of the first circuit board 1 and the second circuit board 2 is directly stacked on the other of the first circuit board 1 and the second circuit board 2, or one of the first circuit board 1 and the second circuit board 2 is indirectly stacked on the other of the first circuit board 1 and the second circuit board 2 through other components ( Figure 2 not shown). The electrical connector 3 is disposed between the first circuit board 1 and the second circuit board 2 in the first direction. Further, the first circuit board 1 and the second circuit board 2 are parallelly arranged in the stacking direction. Here, the parallel arrangement means that the extension surface of the first circuit board 1 and the extension surface of the second circuit board 2 are parallelly arranged. The extension surface of the circuit board refers to the surface where the electronic components are disposed (the side where the electronic components are provided) or the back surface of the surface where the electronic components are disposed. Specifically, the stacking of the first circuit board 1 and the second circuit board 2 can be realized by using the 3D stacking technology, which can further reduce the occupied space of the first circuit board 1 and the second circuit board 2, and thus further reduce the volume of the charger.

[0036] In some embodiments, a power switch and a drive circuit are further provided on the first circuit board 1. The power switch is connected to the primary winding of the transformer 16, and the output end of the drive circuit is connected to the switch control end of the power switch. The output end of the drive circuit is connected to the corresponding terminal in the electrical connector 3. The drive circuit is configured to output a drive signal to the switch control end of the power switch to drive the power switch to perform a switching action. Based on the switching action of the power switch, the transformer 16 performs voltage conversion on the voltage output by the primary side input circuit 10. The drive circuit outputs a corresponding drive signal according to the switch control signal. Among them, the switch control signal is a control signal for controlling the conduction and disconnection of the power switch. The switch control signal can be generated by the drive circuit itself according to the charging state of the charger, or obtained by the drive circuit from the charging controller.

[0037] Please continue to refer to Figure 1 As shown, in some embodiments, the power switch and the drive circuit are integrated into a drive chip 17, and the drive chip 17 is disposed on the first circuit board 1. Further, a charging protocol chip 24 is further provided on the second circuit board 2. The output end of the charging protocol chip 24 is connected to the input end of the drive circuit in the drive chip 17 through the corresponding terminal in the electrical connector 3. The charging protocol chip 24 is configured to output a switch control signal for controlling the conduction and disconnection of the power switch in the drive chip 17 according to the charging requirement of the charging end 23 and the output feedback of the secondary side output circuit 20. The drive chip 17 performs voltage conversion adjustment according to the switch control signal output by the charging protocol chip 24.

[0038] Please continue to refer to Figure 1As shown, in some embodiments, an isolation optocoupler 19 is further provided on the first circuit board 1. The input end of the isolation optocoupler 19 is connected to the output end of the charging protocol chip 24 through corresponding terminals in the electrical connector 3, and the output end of the isolation optocoupler 19 is connected to the input end of the drive circuit in the drive chip 17. The isolation optocoupler 19 is used to send the switching control signal generated by the charging protocol chip 24 on the secondary side of the transformer 16 to the drive chip 17. Among them, the switching control signal can be a control instruction for controlling the power switch to perform corresponding switching actions. The primary side electronic components of the transformer 16 are arranged on the first circuit board 1, while the secondary side electronic components of the transformer 16 are arranged on the second circuit board 2. Then, the transmission of the switching control signal is realized through the isolation optocoupler 19, and the isolation optocoupler 19 is also arranged on the first circuit board 1, which can effectively reduce the volume of the charger and improve its portability.

[0039] In some embodiments, an auxiliary winding ( Figure 1 not shown in the figure) is further provided on the primary side of the transformer 16. The auxiliary winding is connected to the power supply terminal of the drive chip 17 and is used to obtain voltage from the transformer 16 to supply power to the drive chip 17. Specifically, the auxiliary winding is also arranged on the first circuit board 1 to facilitate isolation from the secondary side output circuit 20.

[0040] Please continue to refer to Figure 1 As shown, a Y capacitor 18 is further provided on the first circuit board 1 to filter out common-mode interference signals. Specifically, the Y capacitor 18 is connected in parallel between the ground terminal of the auxiliary winding and the secondary winding of the transformer to establish a discharge channel between the secondary ground of the transformer 16 and the ground. The high-order harmonics of the switching noise of the power switch are discharged to the ground through this channel, thereby avoiding radiation through the power supply line and reducing the radiation interference of the charger.

[0041] Please continue to refer to Figure 1 As shown, in some embodiments, the secondary side output circuit 20 includes a secondary side rectification and filtering circuit 21 and a DC-DC conversion circuit 22. The secondary side rectification and filtering circuit 21 is used to rectify and filter the voltage output by the secondary winding to output a first DC voltage. The DC-DC conversion circuit 22 is respectively connected to the output end of the secondary side rectification and filtering circuit 21, the charging terminal 23, and the charging protocol chip 24, and is used to convert the first DC voltage into a second DC voltage according to the control of the charging protocol chip 24 and output it to the charging terminal 23. Specifically, the charging protocol chip 24 can be a fast charging protocol chip, and the charger provided by the embodiment of the present application is a charger with fast charging function. The DC-DC conversion circuit 22 can specifically be a step-down DC-to-DC converter, and an output filtering circuit is further provided at its output end to provide a cleaner charging voltage for the charging terminal 23.

[0042] Please continue to refer to Figure 1As shown, in some embodiments, a primary side input circuit 10 connected to the primary winding of the transformer 16 is further provided on the first circuit board 1. The primary side input circuit 10 includes a fuse 12, an X capacitor 13, an EMI circuit 14, and a primary side rectifying and filtering circuit 15 that are sequentially connected between the AC input terminal 11 and the primary winding of the transformer 16. For the charger provided in the embodiments of the present application, the primary side electronic components are all arranged on the first circuit board 1, while the secondary side electronic components are all arranged on the second circuit board 2, which is beneficial to reducing the volume of the charger and improving the portability of the charger.

[0043] Please refer to Figure 3 As shown, it is a schematic diagram of the circuit board layout of the charger provided according to some other embodiments of the present application. In some other embodiments, the layout positions of the respective constituent electronic components of the charger on the corresponding circuit boards are specifically provided. Further, in some other embodiments, the transformer 16 includes a primary winding 161, a secondary winding 162, and an auxiliary winding 163. The primary side rectifying and filtering circuit 15 includes a primary side rectifying circuit 151 and a primary side filtering circuit 152. The secondary side rectifying and filtering circuit 21 includes a secondary side rectifying circuit 211 and a secondary side filtering circuit 212. The layout positions of the respective constituent electronic components in the charger on the first circuit board 1 and the second circuit board 2 are specifically as Figure 3 shown. Such a layout is beneficial to reducing the areas of the first circuit board 1 and the second circuit board 2, thereby further reducing the volume of the charger and improving the portability performance of the charger.

[0044] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A charger, characterized in that: It comprises a first circuit board, a second circuit board and an electrical connector, and signals are transmitted between the first circuit board and the second circuit board through the electrical connector; A transformer is provided on the first circuit board, and a secondary winding of the transformer is connected to a corresponding terminal of the electrical connector; A secondary side output circuit is provided on the second circuit board, the input end of the secondary side output circuit is connected to the secondary winding through the corresponding terminal of the electrical connector, the output end of the secondary side output circuit is connected to the charging end, and the secondary side output circuit is used to rectify the voltage output by the secondary winding into a DC voltage and output it to the charging end.

2. The charger according to claim 1, characterized in that: The electrical connector includes a pin header, and the pin headers are respectively connected to the first circuit board and the second circuit board, and the first circuit board and the second circuit board perform signal transmission through the pin headers.

3. The charger according to claim 2, characterized in that: The electrical connector also includes a pin header female socket that cooperates with the pin header, the pin header female socket is arranged on one of the first circuit board and the second circuit board, one end of the pin header is connected to the other of the first circuit board and the second circuit board, and the other end of the pin header is used to be inserted into the jack of the pin header female socket.

4. The charger according to claim 2, characterized in that: The pin header is connected to the first circuit board and / or the second circuit board by welding.

5. The charger according to claim 1, characterized in that: The first circuit board and the second circuit board are stacked.

6. The charger according to claim 1, characterized in that: The first circuit board is also provided with a power switch and a driving circuit; The power switch is connected to the primary winding of the transformer, the output end of the drive circuit is connected to the switch control end of the power switch, and the output end of the drive circuit is connected to the corresponding terminal in the electrical connector; A charging protocol chip is also provided on the second circuit board, and the output end of the charging protocol chip is connected to the input end of the driving circuit through the corresponding terminal in the electrical connector.

7. The charger according to claim 6, characterized in that: The first circuit board is also provided with an isolation optical coupler; The input end of the isolation optocoupler is connected to the output end of the charging protocol chip through the corresponding terminal in the electrical connector, and the output end of the isolation optocoupler is connected to the input end of the drive circuit.

8. The charger according to claim 6, characterized in that: A Y capacitor is also provided on the first circuit board, and the Y capacitor is connected across the auxiliary winding of the transformer and the ground terminal of the secondary winding.

9. The charger according to claim 6, characterized in that: The secondary-side output circuit includes a secondary-side rectifying and filtering circuit and a DC-DC conversion circuit, wherein the secondary-side rectifying and filtering circuit is used to rectify the voltage output by the secondary winding to output a first DC voltage; The DC-DC conversion circuit is respectively connected to the output end of the secondary side rectification and filtering circuit, the charging end and the charging protocol chip, and is used to convert the first DC voltage into a second DC voltage and output it to the charging end according to the control of the charging protocol chip.

10. The charger according to any one of claims 1 to 9, characterized in that: The first circuit board is also provided with a primary side input circuit connected to the primary winding of the transformer, and the primary side input circuit includes a fuse, an X capacitor, an EMI circuit and a primary side rectifier and filter circuit which are sequentially connected between the AC input terminal and the primary winding of the transformer.

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