Small-size charger

Abstract

The utility model discloses a small-size charger, which is characterized in that an AC input, a fuse and an EMI filter circuit are placed on an AC board, a capacitor EC4 and a rectification circuit are placed on a BD board, a differential mode inductor L1, a capacitor C2, a capacitor C3, a capacitor EC9, a transformer, a power management chip and an IC switch tube are placed on a mainboard, and the transformer is output to a synchronous rectification circuit. The low-voltage filter circuit, the chip U4, the chip U5, the USB-A interface and the Type-C interface are placed on the DC board, the AC board, the BD board and the DC board are inserted into matched slots of the mainboard and are electrically connected through the golden finger bonding pads, the transformer fly wire is simultaneously connected to the DC board, and primary energy is transmitted to the secondary DC board, so that the space is fully utilized, the size of the power supply is reduced, and the cost is reduced. By using the structure, the size of the charger can be reduced by more than 30%, the ID is smaller, the charger is more portable, and better use experience is obtained.

Description

Technical Field

[0001] The utility model relates to the technical field of chargers, in particular to a charger with a small volume. Background Technique

[0002] With the development of consumer electronic products, small-sized power adapters and chargers are the future development trend. After the Type-C interface and PD were introduced, a single charger can charge all PD devices. As the charging demand increases, multi-port travel chargers are becoming increasingly popular among consumers. At the same time, for aesthetics and portability, chargers must be made as small in volume and high in power as possible. To achieve a small volume of the charger, in addition to electronic technology, a new layout is required in terms of structure, taking advantage of the large number of surface mount components to reduce the volume. The common layout of chargers usually consists of a single circuit board with all components placed on it, which requires a large amount of space and cannot achieve a small volume of the charger. Summary of the Utility Model

[0003] Based on this, it is necessary to provide a charger with a small volume.

[0004] A charger with a small volume includes a housing, plug pins, an AC board, a BD board, a main board, and a DC board. The plug pins are inserted into the bottom surface of the housing. The AC board is installed on the bottom surface of the housing and is electrically connected to the plug pins. The BD board and the main board are respectively installed on two adjacent side surfaces of the housing. The BD board is perpendicularly inserted into and connected to both the AC board and the main board. The DC board is installed on the top of the housing and is arranged parallel to the AC board. The DC board is perpendicularly inserted into the top of the main board. Electrical connections are made between the AC board, the BD board, the main board, and the DC board through gold finger pads.

[0005] In one embodiment, the AC board includes a fuse and an EMI filtering circuit. The fuse is installed at one end of the AC board, and the EMI filtering circuit is installed at the other end of the AC board and is electrically connected to the fuse.

[0006] In one embodiment, the EMI filtering circuit includes a common mode inductor LF1, a capacitor CX1, and a common mode inductor LF2. The capacitor CX1 is located between the common mode inductor LF1 and the common mode inductor LF2.

[0007] In one embodiment, the BD board has a capacitor EC4 and a rectifying circuit. The capacitor EC4 is installed on the BD board near one end of the common mode inductor LF2 on the AC board, and the rectifying circuit is installed on the top of the BD board.

[0008] In one embodiment, a partition sleeve is provided on the BD board. The partition sleeve is installed on the top of the BD board and is used to isolate the capacitor EC4 and the rectifying circuit from the transformer.

[0009] In one embodiment, on one side of the main board close to the AC board, there are a differential-mode inductor L1, capacitors C2, C3, EC9, a transformer, and a power management chip. The differential-mode inductor L1, capacitor C3, and capacitor C2 are sequentially installed at one end of the main board close to the BD board. The capacitor EC9 is installed at one end of the main board close to the capacitor C2. The transformer is installed at one end of the main board away from the BD board. The power management chip is installed on one side of the main board close to the housing.

[0010] In one embodiment, an IC switching tube is provided on one side of the main board close to the housing. The IC switching tube is used to control the turning on or off of the transformer.

[0011] In one embodiment, on one side of the DC board close to the housing, there are a rectifying chip U1, a rectifying MOS tube Q1, at least one USB-A interface and / or at least one Type-C interface. The rectifying chip U1 and the rectifying MOS tube Q1 form a synchronous rectifying circuit for outputting synchronous rectification. The USB-A interface and the Type-C interface are used to supply power to external devices.

[0012] In one embodiment, on the side of the DC board away from the housing, there are capacitors EC1, EC2, EC3, EC7, a chip U4, and a chip U5. The capacitors EC1, EC2, EC3, and EC7 form a low-voltage filtering circuit.

[0013] In one embodiment, the capacitors EC1, EC2, EC3, and EC7 are sleeved with protective sleeves.

[0014] The above-mentioned small-sized charger, through the coordinated arrangement of pins, AC board, BD board, main board, and DC board, places the AC input, fuse, and EMI filter circuit on the AC board, places the capacitor EC4 and rectifier circuit on the BD board, places the differential-mode inductor L1, capacitor C2, capacitor C3, capacitor EC9, transformer, power management chip, and IC switch on the main board, places the synchronous rectifier circuit of the transformer output, low-voltage filter circuit, chip U4, chip U5, as well as the USB-A interface and Type-C interface on the DC board. The AC board, BD board, and DC board are inserted into the slots on the main board that match them, and are electrically connected through the gold finger pads. The transformer flying wire is also connected to the DC board to transfer the primary energy to the secondary DC board. In this way, the space is fully utilized, the volume of the power supply is reduced, and with this structure, the volume of the charger can be reduced by more than 30%, making the ID smaller and more portable, and obtaining a better user experience. Brief Description of the Drawings

[0015] Figure 1 It is a schematic structural diagram of a small-sized charger according to an embodiment of the present invention;

[0016] Figure 2 is Figure 1 A schematic plan view of the AC board, BD board, and main board of a small-sized charger according to an embodiment of the present invention;

[0017] Figure 3 is Figure 1 A schematic plan view of the BD board, main board, and DC board of a small-sized charger according to an embodiment of the present invention;

[0018] Figure 4 is Figure 1 A schematic structural diagram of one side of the main board of a small-sized charger according to an embodiment of the present invention, which is close to the housing;

[0019] Figure 5 is Figure 1 A circuit schematic diagram of a small-sized charger according to an embodiment of the present invention. Detailed Embodiments

[0020] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of the specific embodiments of the present invention will be given with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0021] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element present. In contrast, when an element is referred to as being "directly" connected to another element, there is no intermediate element.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this utility model belongs. The terms used in the description of this utility model herein are only for the purpose of describing specific embodiments and are not intended to limit this utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0023] As Figure 1 shown, a small-sized charger includes a housing 1, a plug 2, an AC board 3, a BD board 4, a main board 5, and a DC board 6. The plug 2 is inserted into the bottom surface of the housing 1. The AC board 3 is installed on the bottom surface of the housing 1 and electrically connected to the plug 2. The BD board 4 and the main board 5 are respectively installed on two adjacent side surfaces of the housing 1. The BD board 4 is vertically inserted into the AC board 3 and the main board 5 respectively. The DC board 6 is installed on the top of the housing 1 and is arranged parallel to the AC board 3. The DC board 6 is vertically inserted into the top of the main board 5. Electrical connections are made between the AC board 3, the BD board 4, the main board 5, and the DC board 6 through gold finger pads.

[0024] As Figure 2 shown, in one of the embodiments, the AC board 3 includes a fuse and an EMI filtering circuit. The fuse is installed at one end of the AC board 3. The EMI filtering circuit is installed at the other end of the AC board 3 and electrically connected to the fuse. The EMI filtering circuit includes a common mode inductor LF1, a capacitor CX1, and a common mode inductor LF2. The capacitor CX1 is located between the common mode inductor LF1 and the common mode inductor LF2.

[0025] The main function of the EMI filter is to filter out the interference of high-frequency pulses from the external power grid to the power supply, and at the same time, it also reduces the electromagnetic interference of the switching power supply itself to the outside.

[0026] In one embodiment, a capacitor EC4 and a rectifying circuit are provided on the BD board 4. The capacitor EC4 is mounted on the BD board 4 near one end of the common-mode inductor LF2 on the AC board 3, and the rectifying circuit is mounted on the top of the BD board 4. The capacitor EC4 forms a wave-absorbing circuit 1, which can effectively absorb electromagnetic waves and reduce the influence of electromagnetic interference on the charger. The rectifying circuit is a rectifier bridge. The input end of the rectifying circuit is electrically connected to the output end of the common-mode inductor LF2, and the output end of the rectifying circuit is electrically connected to the capacitor EC4. The rectifying circuit converts alternating current into direct current.

[0027] In one embodiment, a partition sleeve 41 is provided on the BD board 4. The partition sleeve 41 is mounted on the top of the BD board 4 and is used to isolate the capacitor EC4 and the rectifying circuit from the transformer.

[0028] In this way, through the arrangement of the partition sleeve 41, the capacitor EC4 and the rectifying circuit can be separated from the transformer 7, avoiding mutual influence between the capacitor EC4 and the rectifying circuit and the transformer 7.

[0029] As Figure 3 and Figure 4 shown, in one embodiment, a differential-mode inductor L1, capacitors C2, C3, capacitor EC9, a transformer 7, and a power management chip 8 are provided on one side of the main board 5 close to the AC board 3. The differential-mode inductor L1, capacitor C3, and capacitor C2 are sequentially mounted on one end of the main board close to the BD board 4. The capacitor EC9 is mounted on the main board 5 close to the capacitor C2. The transformer is mounted on the main board 5 away from the BD board. The power management chip is mounted on one side of the main board 5 close to the housing 1. An IC switch tube 9 is provided on one side of the main board 5 close to the housing, and the IC switch tube 9 is used to control the on or off of the transformer 7.

[0030] In this way, the differential-mode inductor L1, capacitors C2, and C3 form a π-type filter circuit, which can effectively remove high-frequency noise and interference in the signal and make the output signal clearer and more stable. The capacitor EC9 forms a wave-absorbing circuit 2. The two ends of the π-type filter circuit are respectively electrically connected to the wave-absorbing circuit 1 and the wave-absorbing circuit 2. The power management chip 8 and the IC switch tube 9 are on one side of the main board 5 close to the housing 1, which can further save space.

[0031] In one embodiment, one side of the DC board 6 close to the housing 1 is provided with a rectifier chip U1, a rectifier MOS transistor Q1, at least one USB-A interface and / or at least one Type-C interface. The rectifier chip U1 and the rectifier MOS transistor Q1 form a synchronous rectification circuit for outputting synchronous rectification. The USB-A interface and the Type-C interface are used to supply power to external devices. On the side of the DC board away from the housing, there are a capacitor EC1, a capacitor EC2, a capacitor EC3, a capacitor EC7, a chip U4 and a chip U5. The capacitor EC1, the capacitor EC2, the capacitor EC3 and the capacitor EC7 form a low-voltage filtering circuit.

[0032] In this way, when the output interfaces are one USB-A interface and one Type-C interface, the input end of the synchronous rectification circuit is connected to the output end of the transformer 7, the output end is connected to the input end of the low-voltage filtering circuit, the output end of the low-voltage filtering circuit is respectively connected to the chip U4 and the chip U5, the chip U4 is electrically connected to the Type-C interface, and the chip U5 is electrically connected to the USB-A interface.

[0033] The output interfaces can also be multiple Type-C interfaces. For example, if there are 3 Type-C interfaces and no USB-A interface, then the chip U4 and the chip U5 are respectively electrically connected to the 3 Type-C interfaces.

[0034] In one embodiment, the capacitor EC1, the capacitor EC2, the capacitor EC3 and the capacitor EC7 are sleeved with a protective sleeve 61.

[0035] In this way, through the setting of the protective sleeve 61, the capacitor EC1, the capacitor EC2, the capacitor EC3 and the capacitor EC7 can be well separated from other components, avoiding mutual interference with other components.

[0036] As Figure 5 shown, after the pin 2 is inserted into an external power supply for conduction, the current passes through the fuse and the EMI filtering circuit for filtering and then enters the rectification circuit. After converting the alternating current into direct current in the rectification circuit, it enters the wave-absorbing circuit 1, the π-type filtering circuit and the wave-absorbing circuit 2 in sequence to remove interference and then enters the transformer 7. After being stepped down by the transformer 7, it enters the synchronous rectification circuit and the low-voltage filtering circuit to remove high-frequency clutter, and then the chip U4 and the chip U5 respectively control the Type-C interface and the USB-A interface to charge the electrical equipment.

[0037] In this way, for the small-sized charger, through the cooperative arrangement of the pin 2, the AC board 3, the BD board 4, the main board 5, and the DC board 6, the AC input, the fuse, and the EMI filtering circuit are placed on the AC board 3, the capacitor EC4 and the rectifying circuit are placed on the BD board 4, the differential-mode inductor L1, the capacitors C2, C3, EC9, the transformer 7, the power management chip, and the IC switching tube are placed on the main board 5, the synchronous rectifying circuit output by the transformer 7, the low-voltage filtering circuit, the chips U4 and U5, as well as the USB-A interface and the Type-C interface are placed on the DC board 6. The AC board 3, the BD board 4, and the DC board 6 are inserted into the slots on the main board 5 that match them, and electrical connections are made through the gold finger pads. The transformer 7 is connected to the DC board 6 through a flying wire to transfer the primary energy to the secondary DC board 6. In this way, the space is fully utilized, the volume of the power supply is reduced, and with this structure, the volume of the charger can be reduced by more than 30%, making the ID smaller and more portable, and obtaining a better use experience.

[0038] The above-described embodiments merely represent several implementation manners of the present utility model, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the present utility model patent shall be subject to the appended claims.

Claims

1. A charger with a small volume, characterized in that: It includes a housing, pins, an AC board, a BD board, a main board, and a DC board. The pins are plugged into the bottom surface of the housing. The AC board is installed on the bottom surface of the housing and electrically connected to the pins. The BD board and the main board are respectively installed on two adjacent side surfaces of the housing. The BD board is vertically plugged into the AC board and the main board respectively. The DC board is installed on the top of the housing and is arranged parallel to the AC board. The DC board is vertically plugged into the top of the main board. Electrical connections are made between the AC board, the BD board, the main board, and the DC board through gold finger pads.

2. The small-sized charger according to claim 1, wherein: The AC board includes a fuse and an EMI filter circuit. The fuse is installed at one end of the AC board. The EMI filter circuit is installed at the other end of the AC board and is electrically connected to the fuse.

3. The small-sized charger according to claim 2, wherein: The EMI filter circuit includes a common mode inductor LF1, a capacitor CX1, and a common mode inductor LF2. The capacitor CX1 is between the common mode inductor LF1 and the common mode inductor LF2.

4. The small-sized charger according to claim 3, wherein: The BD board has a capacitor EC4 and a rectification circuit. The capacitor EC4 is installed on the BD board near one end of the common mode inductor LF2 on the AC board. The rectification circuit is installed on the top of the BD board.

5. The small-sized charger according to claim 4, wherein: The BD board has a partition sleeve. The partition sleeve is installed on the top of the BD board and is used to isolate the capacitor EC4 and the rectification circuit from the transformer.

6. The small-sized charger according to claim 4, wherein: On the side of the main board close to the AC board, there are a differential mode inductor L1, capacitors C2, C3, capacitor EC9, a transformer, and a power management chip. The differential mode inductor L1, capacitor C3, and capacitor C2 are sequentially installed at one end of the main board close to the BD board. The capacitor EC9 is installed on the main board close to the capacitor C2. The transformer is installed at the end of the main board far from the BD board. The power management chip is installed on the side of the main board close to the housing.

7. The small-sized charger according to claim 6, wherein: On the side of the main board close to the housing, there is an IC switching tube, which is used to control the on or off of the transformer.

8. A small-sized charger according to claim 6, characterized in that: On the side of the DC board close to the housing, there are a rectification chip U1, a rectification MOS tube Q1, at least one USB-A interface and / or at least one Type-C interface. The rectification chip U1 and the rectification MOS tube Q1 form a synchronous rectification circuit for outputting synchronous rectification. The USB-A interface and the Type-C interface are used to supply power to external devices.

9. The small-sized charger according to claim 6, wherein: On the side of the DC board far from the housing, there are capacitors EC1, EC2, EC3, EC7, a chip U4, and a chip U5. The capacitors EC1, EC2, EC3, and EC7 form a low-voltage filter circuit.

10. A small-sized charger according to claim 9, characterized in that: The capacitors EC1, EC2, EC3, and EC7 are sleeved with protective sleeves.

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