PCB structure of flat transformer

Abstract

The utility model discloses a PCB (printed circuit board) structure of a flat transformer, which comprises a plurality of layers of PCBs, winding coils welded on each layer of PCB and a plurality of groups of electricity leading copper needles connected on the plurality of layers of PCBs in a penetrating manner, and a plurality of groups of bonding pads are respectively arranged on two sides of the plurality of layers of PCBs to form a primary electricity connecting end and a secondary electricity connecting end. The primary windings on the top layer PCB and the bottom layer PCB realize staggered wiring between laminates by utilizing a conduction path III and a conduction path IV which are arranged on the second layer PCB and the third layer PCB and then are connected with a primary wiring end, so that interlayer and turn-to-turn capacitance of the PCB transformer is reduced, common-mode interference of the PCB transformer is reduced, the anti-EMI capability of a product is improved, and the service life of the product is prolonged. The function of replacing a shielding winding is achieved; and on the other hand, a series circuit of the primary winding is changed by utilizing the structure that the primary winding is arranged through a double-layer plate, so that the two primary windings are connected in series through the MOS tube. The PCB of the utility model can reduce the number of laminates for arranging the shielding winding and the auxiliary winding, thereby achieving the purposes of simplifying the structure of the PCB and optimizing the cost of the PCB.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of flat transformer, specifically a PCB board structure of flat transformer. BACKGROUND

[0002] The power adapter is the equipment that the alternating current is converted for the battery in electronic product after low voltage direct current charges, provides electric energy. Along with the development of technology, small size, high power density and high integration become the pursuit target and development direction of power adapter, therefore set up a kind of flat transformer in power adapter as the core electric energy conversion component, flat transformer has the advantages such as small volume, high current density, can fully realize efficient electric energy power conversion, and therefore is widely used.

[0003] The electric energy conversion of flat transformer is realized through the core PCB winding board, and the traditional PCB winding board is provided with coil winding on each layer of PCB board, and the coil winding is used to form an electric energy conversion. The existing PCB winding board includes a plurality of layers of plates arranged with primary winding, secondary winding, shielding layer winding and auxiliary winding, and the number of layers is large and the wiring structure is complex. The applicant believes that the PCB winding board can be further optimized. SUMMARY

[0004] In order to overcome the shortcomings of the prior art, the utility model provides a PCB board structure of flat transformer.

[0005] The utility model solves the technical scheme that the technical problem adopts:

[0006] A kind of PCB board structure of flat transformer, including multilayer PCB board and the winding coil welded on each layer of PCB board and the multiple groups of electric copper needle that are inserted in multilayer PCB board, coil winding can be realized by electric copper needle in series, multilayer PCB board two sides are respectively provided with multiple soldering pads to form primary electric terminal and secondary electric terminal, multilayer PCB board includes top layer PCB board, second layer PCB board, third layer PCB board and bottom layer PCB board;

[0007] Top layer PCB board and bottom layer PCB board are respectively provided with primary winding;The top layer PCB board is also arranged with guide path I;The bottom layer PCB board is also arranged with guide path II;

[0008] Second layer PCB board and third layer PCB board are respectively provided with secondary winding;The second layer PCB board is also arranged with guide path III;The third layer PCB board is also arranged with guide path IV;

[0009] The primary electric terminal includes first input port, second input port, third input port and fourth input port, and primary electric terminal and magnetic core are same level;

[0010] One end of the primary winding on the top layer PCB board is connected to the first input port, and the other end is connected to the conducting path III on the second layer PCB board through the third electric copper needle, and then connected to the conducting path I on the top layer PCB board through the second electric copper needle, and further connected to the second input port;

[0011] One end of the primary winding on the bottom layer PCB board is connected to the fourth input port, and the other end is connected to the conducting path IV on the third layer PCB board through the fourth electric copper needle, and then connected to the conducting path II on the bottom layer PCB board through the first electric copper needle, and further connected to the third input port;

[0012] Among them, the second input port and the third input port of the primary power terminal are respectively connected with the D pole and the S pole of the MOS tube;

[0013] The secondary power terminal includes a first output port and a second output port, which are respectively connected with the output end of the secondary winding on the second layer PCB board and the third layer PCB board.

[0014] The top layer PCB board is also provided with a conducting path V, and the bottom layer PCB board is also provided with a conducting path VI. The conducting path II on the bottom layer PCB board is first connected to the conducting path V on the top layer PCB board through the sixth electric copper needle, and then connected to the conducting path VI on the bottom layer PCB board through the fifth electric copper needle, and further connected to the third input port.

[0015] The electric copper needles are divided into three groups, and the group closest to the secondary power terminal is arranged in the direction of the primary power terminal. Among them, the first group includes the first and second electric copper needles, the second group includes the third and fourth electric copper needles, and the third group includes the fifth and sixth electric copper needles.

[0016] The first group and the third group of electric copper needles are respectively located on both sides of the primary winding, and the second group of electric copper needles is located in the inner circle of the primary winding.

[0017] The conducting path V on the top layer PCB board is connected to the sixth electric copper needle after surrounding the primary winding on the top layer PCB board from the fifth electric copper needle.

[0018] The utility model discloses a beneficial effect is: the utility model discloses the primary winding on the top layer PCB board and bottom layer PCB board utilizes the through path III and the through path IV of the arrangement on the second layer PCB board and the third layer PCB board realizes the staggered wiring between the layer plate again and the primary connection, thereby reducing the interlayer and turn-to-turn capacitance of PCB transformer, reducing the common mode interference of PCB transformer, improving the anti EMI ability of product, reaches the function of replacing shielding winding, and then cancels the arrangement of shielding winding, reduces the layer plate of arrangement shielding winding, on the other hand, utilize the primary winding through the structure of double -deck plate arrangement, change the series connection line of primary winding, make two parts primary winding realize series connection through MOS tube, because primary winding is divided into two parts through MOS tube, and its voltage also shares, makes panel transformer can utilize one part primary winding to function as auxiliary winding, and then cancels auxiliary winding, and reduces the layer plate of arrangement auxiliary winding, finally, the PCB board of the utility model can reduce the layer plate of arrangement shielding winding, auxiliary winding and reach the purpose of simplifying PCB board structure, optimizing PCB board cost. BRIEF DESCRIPTION OF DRAWINGS

[0019] The utility model is further explained below in connection with the drawings and examples.

[0020] Figure 1 It is the structure schematic diagram of the utility model;

[0021] Figure 2 It is the structure schematic diagram of the top layer PCB board of the utility model;

[0022] Figure 3 It is the structure schematic diagram of the second layer PCB board of the utility model;

[0023] Figure 4 It is the structure schematic diagram of the third layer PCB board of the utility model;

[0024] Figure 5 It is the structure schematic diagram of the bottom layer PCB board of the utility model. DETAILED DESCRIPTION

[0025] Referring to Figures 1 to 5 The PCB board structure of one panel transformer of the utility model discloses a kind of multi-layer PCB board and welding on each layer PCB board winding coil and pass through multiple groups of electric copper needle of introduction on multi-layer PCB board, coil winding can be connected in series by electric copper needle of introduction, and multiple groups of solder pad are formed primary electrical terminal and secondary electrical terminal, which are respectively arranged on the both sides of multi-layer PCB board.

[0026] The multi-layer PCB board comprises a top layer PCB board 1, a second layer PCB board 2, a third layer PCB board 3 and a bottom layer PCB board 4; the top layer PCB board 1 and the bottom layer PCB board 4 are respectively provided with a primary winding 5; the top layer PCB board 1 is further provided with a conducting path I 7; the bottom layer PCB board 4 is further provided with a conducting path II 8; the second layer PCB board 2 and the third layer PCB board 3 are respectively provided with a secondary winding 6; the second layer PCB board 2 is further provided with a conducting path III 9; and the third layer PCB board 3 is further provided with a conducting path IV 10.

[0027] The primary electrical terminal comprises a first input port 13, a second input port 14, a third input port 15 and a fourth input port 16, and the primary electrical terminal is at the same level as the magnetic core 25, i.e. the primary electrical terminal is grounded, so that the PCB board can reduce the arrangement of the safety layer.

[0028] One end of the primary winding on the top layer PCB board 1 is connected to the first input port 13, the other end is connected to the conducting path III 9 on the second layer PCB board 2 through the third copper needle 19, and then connected to the conducting path I 7 on the top layer PCB board 1 through the second copper needle 18 and then connected to the second input port 14; one end of the primary winding on the bottom layer PCB board 4 is connected to the fourth input port 16, the other end is connected to the conducting path IV 10 on the third layer PCB board 3 through the fourth copper needle 20, and then connected to the conducting path II 8 on the bottom layer PCB board 4 through the first copper needle 17 and then connected to the third input port 15; at this time, the primary windings on the top layer PCB board and the bottom layer PCB board realize staggered wiring between the layers through the conducting path III 9 and the conducting path IV 10, and then are connected to the primary terminal, so as to reduce the interlayer and turn-to-turn capacitance of the PCB transformer, reduce the common mode interference of the PCB transformer, improve the anti-EMI capability of the product, achieve the function of replacing the shielded winding, cancel the arrangement of the shielded winding, and reduce the layer board arranged with the shielded winding.

[0029] The second input port 14 and the third input port 15 of the primary electrical terminal are respectively connected to the D pole and the S pole of the MOS tube, the structure of the primary winding arranged through the double-layer board is changed to change the series connection of the primary winding, so that the two parts of the primary winding are connected in series through the MOS tube, and since the primary winding is divided into two parts through the MOS tube, the voltage is also shared, so that the flat transformer can use one part of the primary winding as an auxiliary winding, thereby canceling the auxiliary winding and reducing the layer board arranged with the auxiliary winding.

[0030] The secondary electrical terminal comprises a first output port 23 and a second output port 24, which are respectively connected to the output end of the secondary winding on the second layer PCB board 2 and the third layer PCB board 3.

[0031] Finally, the PCB board can reduce the layer plate arranged with shielding winding and auxiliary winding, and the PCB board structure of four layers is formed, so that the structure is simplified, and the cost is optimized.

[0032] As a preferred scheme of the utility model, in order to further enhance the effect of anti-interference, the top layer PCB board 1 is further provided with a conducting path V 11, the bottom layer PCB board 4 is further provided with a conducting path VI 12, the conducting path II 8 on the bottom layer PCB board 4 is connected with the conducting path V 11 of the top layer PCB board 1 through the sixth electric copper needle 22, then is connected with the conducting path VI 12 on the bottom layer PCB board 4 through the fifth electric copper needle 21, and then is connected with the third input port 15, and the interference between layers is further reduced by further increasing the staggered line.

[0033] As a preferred scheme, the electric copper needle is divided into three groups, and a group close to the secondary electric terminal is arranged in the direction of the primary electric terminal, wherein the first group and the third group are the first group, the second group and the fourth group are the second group, and the fifth group and the sixth group are the third group. Figure 1 In the middle, the conducting path V 11 of the top layer PCB board 1 is connected with the sixth electric copper needle 22 after surrounding the original side winding on the top layer PCB board 1 from the fifth electric copper needle 21.

Claims

1. A PCB structure of a planar transformer, comprising a plurality of layers of PCBs, winding coils welded on each layer of PCBs, and a plurality of groups of copper pins for connecting the winding coils in series, and a plurality of groups of soldering pads arranged on both sides of the plurality of layers of PCBs to form a primary terminal and a secondary terminal, characterized in that: the plurality of layers of PCBs comprises a top layer of PCBs (1), a second layer of PCBs (2), a third layer of PCBs (3), and a bottom layer of PCBs (4); the top layer of PCBs (1) and the bottom layer of PCBs (4) are respectively provided with a primary winding (5); the top layer of PCBs (1) is further provided with a conducting path I (7); the bottom layer of PCBs (4) is further provided with a conducting path II (8); the second layer of PCBs (2) and the third layer of PCBs (3) are respectively provided with a secondary winding (6); the second layer of PCBs (2) is further provided with a conducting path III (9); the third layer of PCBs (3) is further provided with a conducting path IV (10); the primary terminal comprises a first input port (13), a second input port (14), a third input port (15), and a fourth input port (16), and the primary terminal and the magnetic core (25) are at the same level; one end of the primary winding on the top layer of PCBs (1) is connected to the first input port (13), and the other end is connected to the conducting path III (9) on the second layer of PCBs (2) through a third copper pin (19), and then connected to the conducting path I (7) of the top layer of PCBs (1) through a second copper pin (18) and further connected to the second input port (14); one end of the primary winding on the bottom layer of PCBs (4) is connected to the fourth input port (16), and the other end is connected to the conducting path IV (10) on the third layer of PCBs (3) through a fourth copper pin (20), and then connected to the conducting path II (8) of the bottom layer of PCBs (4) through a first copper pin (17) and further connected to the third input port (15); wherein the second input port (14) and the third input port (15) of the primary terminal are respectively connected to the D pole and the S pole of the MOS tube; the secondary terminal comprises a first output port (23) and a second output port (24) connected to the output ends of the secondary windings on the second layer of PCBs (2) and the third layer of PCBs (3), respectively; the top layer of PCBs (1) is further provided with a conducting path V (11), and the bottom layer of PCBs (4) is further provided with a conducting path VI (12); the conducting path II (8) on the bottom layer of PCBs (4) is first connected to the conducting path V (11) of the top layer of PCBs (1) through a sixth copper pin (22), and then connected to the conducting path VI (12) on the bottom layer of PCBs (4) through a fifth copper pin (21) and further connected to the third input port (15); the copper pins are divided into three groups, and arranged in order from the group closest to the secondary terminal to the primary terminal, wherein the first and second copper pins are the first group, the third and fourth copper pins are the second group, and the fifth and sixth copper pins are the third group. ​ ​ ​ ​ ​ ​ ​ ​ 2. The PCB board structure of claim 1, wherein: ​ 3. The PCB board structure of claim 1, wherein: ​ 4. The PCB board structure of claim 3, wherein: The first group and the third group of copper current-carrying needles are respectively located on two sides of the original side winding, and the second group of copper current-carrying needles is located on the inner circle of the original side winding.

5. The PCB board structure of claim 4, wherein: The conducting path V (11) of the top layer PCB (1) is connected with the sixth copper current-carrying needle (22) after surrounding the original side winding on the top layer PCB (1) from the fifth copper current-carrying needle (21).

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