TWI597744B - Transformer combination structure and its power supply device - Google Patents

Description

Transformer combined structure and power supply device thereof

The present invention relates to a power supply device, and more particularly to a transformer combination structure and a power supply device thereof which can effectively save board space and have low power consumption.

The main purpose of the power supply device is to convert the high-voltage and low-stability AC input power provided by the power company into a low-voltage and stable DC output power supply suitable for various electronic devices. Therefore, the power supply is widely used in electronic devices such as computers, office automation equipment, industrial control equipment, and communication equipment.

Referring to FIG. 1, the power supply device generally includes a transformer 12, a primary side circuit 11 and a secondary side circuit 13, wherein the primary side circuit 11, the secondary side circuit 13 (including the circuit of the rectifier circuit 131, the filter circuit 132, etc.) and the transformer 12 The components are disposed on the main circuit board, and the electrical connections of the components are performed through the copper foil printed circuit on the main circuit board. Especially when the transformer 12 is electrically connected to the inductance component, the copper foil printed circuit must be connected, however, due to the circuit board The copper foil has low thickness and high impedance, which makes the power supply of the power supply high. Moreover, the electronic equipment is gradually developing toward high efficiency and small volume. The above installation method also occupies a large amount of space on the main circuit board, and cannot effectively improve. The space utilization of the main board. Therefore, there is a need for a circuit assembly method of a power supply device with high efficiency and high space utilization.

An object of the present invention is to provide a transformer combined structure and the same The power supply device of the combined structure, the transformer combination structure can electrically connect the transformer and the inductance component outside the main circuit board through the conductive sheet, without connecting through the copper foil printed circuit, and has low effective power loss and high space utilization.

In order to achieve the object, a transformer assembly structure includes a transformer, an inductor component, a first circuit board and at least one conductive strip, the conductive strip being mounted between the transformer and the first circuit board and including a first conductive One end of the first conductive sheet is electrically connected to the transformer, and the other end is convexly provided with a first bump, and the first circuit board is provided with a first through hole for the first bump to pass through and the inductor a second through hole through which the conductive pin of the component passes, and the first bump and the conductive pin of the inductor component respectively pass through the first through hole and the second through hole to protrude from the first circuit board The first circuit board between the first bump and the conductive pin of the inductive component is provided with a solder conductive material electrically connecting the first bump and the conductive pin of the inductive component.

Compared with the prior art, the inductive component protrudes from the first circuit board by the conductive pin, and the transformer protrudes from the first bump on the first circuit board adjacent to the conductive pin of the inductor component through the conductive sheet. The first bump and the conductive pin of the inductive component are then electrically connected together to form a solder conductor to electrically connect the transformer and the inductor component without electrical connection through the copper foil printed circuit, low effective power loss, and transformer and The inductance component is electrically connected on the first circuit board, which effectively saves the utilization space of the main circuit board, and makes the space utilization of the main circuit board high.

In an embodiment of the invention, the conductive sheet further includes at least one second conductive sheet, the second conductive sheet is electrically connected to the transformer at one end, and the other end extends along the edge of the first circuit board along the first circuit board. An outer conductive terminal is formed, and the outer conductive terminal is used to connect a second circuit board. The solution allows the transformer to pass through the conductive sheet and another electric power different from the first circuit board. The board is electrically connected.

In an embodiment of the invention, the conductive sheet is provided with at least one conductive hole, and a conductive pin of the transformer correspondingly passes through the conductive hole and electrically connects the conductive sheet to the corresponding conductive pin, so that the conductive pin The conductive sheet is electrically connected to the transformer, and the solution makes the assembly method of the invention simple, and the connection between the conductive sheet and the transformer is stable.

In an embodiment of the invention, the first conductive sheet includes a first conductive portion having the conductive hole, a second conductive portion extending longitudinally along the first conductive portion toward the inductor element, and the second conductive portion a third conductive portion extending in a direction perpendicular to the direction of the inductive component, the first bump being a lateral strip protruding from the third conductive portion, the first through hole being Long holes with transverse strips. The solution not only facilitates the solder conductor to electrically connect the first bump and the conductive pin of the inductive component, but further reduces the impedance between the transformer and the inductive component, and the power loss is low.

In an embodiment of the invention, the conductive sheet further includes at least one third conductive sheet, the third conductive sheet is provided with a plurality of conductive holes, and the plurality of conductive holes of the third conductive sheet are respectively supplied to the plurality of transformers. The conductive pins are correspondingly passed through to electrically connect the plurality of corresponding conductive pins of the transformer.

In an embodiment of the invention, the first circuit board is provided with a pin jack corresponding to the conductive hole, and a corresponding conductive pin of the transformer passes through the conductive hole and is inserted into the pin jack. . The solution further increases the stability and resistance to external forces of the transformer combination structure.

In an embodiment of the invention, the conductive sheet is convexly provided with a positioning protrusion, and the first circuit board is provided with a positioning hole for mounting the positioning protrusion, and the positioning protrusion is inserted into the positioning hole to electrically conductive The sheet is fixed on the first circuit board, and the first bump is a positioning of the first conductive sheet a bump, the first through hole being a corresponding positioning hole. The solution enables the conductive sheet to be effectively fixed on the first circuit board, thereby avoiding the influence of the external force on the electrical conductivity of the transformer and other components. Of course, a positioning protrusion different from the first protrusion may be additionally disposed in the first conductive sheet, and a positioning hole corresponding thereto is disposed on the first circuit board.

In an embodiment of the invention, the positioning protrusion is formed by bending one side edge of the conductive sheet upward. The solution makes the conductive sheet structure simple and easy to manufacture. Of course, the positioning bump can also be protruded in the middle of the conductive sheet.

In an embodiment of the invention, the first via is adjacent to the second via such that the first bump is adjacent to the conductive pin of the inductive component. It is convenient for the solder conductor to electrically connect the transformer and the inductive component.

The present invention also provides a power supply device comprising a primary side circuit, a secondary side circuit and a transformer combination structure. The transformer combination structure is as described above, the primary side circuit is electrically connected to one end of the transformer combination structure, and the secondary side circuit is The other end of the transformer assembly is electrically connected. Compared with the prior art, the inductive component protrudes from the first circuit board by the conductive pin, and the transformer protrudes from the first bump on the first circuit board adjacent to the conductive pin of the inductor component through the conductive sheet. The first bump and the conductive pin of the inductive component are then electrically connected together to form a solder conductor to electrically connect the transformer and the inductor component without electrical connection through the copper foil printed circuit, low effective power loss, and transformer and The inductance component is electrically connected on the first circuit board, which effectively saves the utilization space of the main circuit board, and makes the space utilization of the main circuit board high.

In an embodiment of the invention, the power supply device further includes a main circuit board, the primary side circuit, the secondary side circuit, and the transformer are mounted on the main circuit board, the first circuit The board is an auxiliary board and is located on the side of the transformer remote from the main board. The first circuit board and the main circuit board are respectively located on opposite sides of the transformer, which effectively saves space in the power supply device and improves space utilization of the entire power supply device.

In an embodiment of the invention, the secondary circuit includes a rectifier circuit board and an inductance component, the conductive sheet further includes a second conductive sheet, and one end of the second conductive sheet is electrically connected to the auxiliary circuit board, and the second conductive The other end of the sheet extends along the edge of the first circuit board along the first circuit board to form an outer conductive terminal, and the rectifier circuit board is provided with a pin socket for mounting the outer conductive terminal, and the outer conductive terminal is mounted thereon A conductive pin in the pin slot for causing the transformer to output an induced voltage signal is electrically connected to the rectifier circuit board through the second conductive sheet to supply the induced voltage of the transformer to the rectifier circuit board for rectification. The scheme separates the rectifier circuit from the main circuit board, further improves the space utilization of the main circuit board, and since the rectifier circuit board is electrically connected to the transformer through the pin slot on the same, the rectifier circuit board is opposite to the main circuit The vertical arrangement of the board and the auxiliary circuit board further saves space in the power supply device and improves the space utilization of the entire power supply device.

In an embodiment of the invention, the rectifier circuit board is provided with a conductive pin, and the main circuit board is electrically connected to the rectifier circuit board through the conductive pin to obtain an induced voltage signal after rectification of the rectifier circuit board, and the assembly is convenient.

20‧‧‧Power supply unit

21‧‧‧Transformer combination structure

22‧‧‧Rectifier Board

222‧‧‧Electrical pins

31‧‧‧Transformers

311, 312, 313, 321‧‧‧ conductive pins

32‧‧‧Inductive components

33‧‧‧First board

331‧‧‧ first through hole

332‧‧‧Second through hole

333, 334‧‧‧ positioning holes

41‧‧‧First conductive sheet

411‧‧‧First bump

42‧‧‧Second conductive sheet

421, 431‧‧‧ positioning bumps

422‧‧‧External conductive terminals

412, 423, 432‧‧‧ conductive holes

43‧‧‧ Third conductive sheet

51, 52, 53‧‧‧ pin jacks

61‧‧‧First Conductive Department

62‧‧‧Second Conductive Department

63‧‧‧The third conductive part

Fig. 1 is a circuit diagram of a power supply device in the prior art.

Fig. 2 is a partial structural view showing the power supply device of the present invention.

Fig. 3 is a schematic view showing the structure of the power supply device shown in Fig. 2 from another angle.

Figure 4 is a schematic view showing the structure of the transformer combined structure of the present invention.

Fig. 5 is a schematic view showing the structure of the transformer assembly structure shown in Fig. 4 at another angle.

Fig. 6 is an exploded perspective view showing the transformer assembly structure shown in Fig. 4.

Figure 7 is a schematic view showing the structure of the first conductive sheet of the present invention.

Figure 8 is a schematic view showing the structure of a second conductive sheet of the present invention.

Figure 9 is a schematic view showing the structure of a third conductive sheet of the present invention.

Referring to FIGS. 2 and 3, the present invention discloses a power supply device 20 including a primary side circuit (not shown), a secondary side circuit (rectifier circuit board 22), and a transformer combination structure 21, wherein the primary side circuit The second side circuit (rectifier circuit board 22) is electrically connected to the other end of the transformer assembly structure 21, and the transformer assembly structure 21 includes a transformer. Referring to FIG. 4 to FIG. 31. The inductor component 32, the first circuit board 33 and the at least one conductive strip, the transformer 31 and the inductor component 32 are mounted on the first circuit board 33. The conductive strip is mounted between the transformer and the first circuit board 33 and includes a first conductive The first conductive plate 41 is electrically connected to the transformer 31, and the other end is convexly provided with a first bump 411. The first circuit board 33 is provided with a first through hole 331 through which the first bump 411 passes. a second through hole 332 through which the conductive pin 321 of the inductive component 32 passes, and the first bump 411 and the conductive pin 321 of the inductive component 32 pass through the first through hole 331 and the second through hole 332, respectively. On the first circuit board 33, the first bump 411 and the inductance component A solder conductor (not shown) electrically connecting the first bump 411 and the conductive pin 321 of the inductor element 32 is disposed on the first circuit board 33 between the conductive pins 321 of 32.

When the transformer assembly structure 21 is assembled, one end of the first conductive piece 41 is electrically connected to the corresponding conductive pin 313 of the transformer 31, and the first protrusion 411 of the other end passes through the first through hole 331. Mounted on the first circuit board 33, the conductive pin 321 of the inductor element 32 is mounted on the first circuit board 33 through the second through hole 332, and the first bump 411 and the conductive pin 321 are soldered to be used in the first A solder conductor is formed between the bump 411 and the conductive pin 321 of the inductive component 32, so that the first bump 411 and the conductive pin 321 are electrically connected together through the solder conductive material, without electrical connection through the copper foil printed circuit, effective power The loss is low, and the conductive pin 313 of the transformer 31 and the conductive pin 321 of the inductor element 32 are electrically connected on the first circuit board 33 through the first conductive sheet 41, thereby effectively saving the utilization space of the main circuit board, so that the main circuit Board space utilization is high.

Preferably, the first through hole 331 is adjacent to the second through hole 332. At this time, the first bump 411 and the conductive pin 321 are adjacently protruded from the first circuit board 33, so that the solder conductive material is electrically connected to the first bump. 411 and conductive pin 321 .

Preferably, referring to FIG. 7, the first bump 411 of the first conductive sheet 41 and the first through hole 331 on the first circuit board 33 cooperate to insert the first bump 411 of the first conductive sheet 41. It is connected to the first through hole 331 to effectively fix the first conductive sheet 41 to the first circuit board 33. Of course, the positioning protrusions may be separately disposed on the first conductive sheet 41, and the positioning holes corresponding to the positioning protrusions are disposed on the first circuit board 33, and the first conductive sheet is disposed by the positioning and positioning of the positioning protrusions and the positioning holes. The 411 is fixed to the first circuit board 33.

Preferably, the first conductive sheet 41 is provided with at least one conductive hole 412. The conductive pin 313 of the transformer 31 passes through the conductive hole 412 correspondingly, and the conductive pin 313 and the conductive hole 412 are soldered to make the first conductive The sheet 41 is electrically connected to a corresponding conductive pin 313 in the transformer 31. Of course, the conductive pin 313 can also be in contact with the hole wall of the conductive hole 412 or the first conductive piece 41 to electrically connect the first conductive piece 41 with the conductive pin 313 in the transformer 31.

Specifically, the first conductive sheet 41 includes a first conductive portion in which the conductive hole 412 is opened. 61. A second conductive portion 62 extending longitudinally along the direction of the first conductive portion 61 toward the inductor element 32 and a third conductive portion 63 extending from the portion of the second conductive portion 62 adjacent to the inductor element 32 to extend perpendicular to the direction of the inductor element 32 . This solution further reduces the impedance between the transformer and the inductive component 32 with low power loss. The first protrusion 411 is a horizontal strip protruding from the third conductive portion 63, and the first through hole 331 is a long hole that is matched with the lateral strip.

More specifically, the first bump 411 is formed by bending the third conductive portion 63 adjacent to one side edge of the inductance element 32.

Specifically, the first circuit board 33 is provided with a pin insertion hole 51 corresponding to the conductive hole 412. The corresponding conductive pin 313 of the transformer 31 passes through the conductive hole 412 and is inserted into the pin insertion hole 51, and is electrically conductive. The positioning bumps 421 and 431 of the chip cooperate with the positioning holes 333 and 334 of the first circuit board 33 to effectively prevent the conductive sheet from being affected by external force to affect conductivity or cause short circuit, thereby increasing the stability and external resistance of the transformer assembly structure 21. performance.

In this embodiment, the number of the conductive holes 412 is two, and the number of the conductive holes 412 can be determined by the technician according to the number of the conductive pins 313 of the transformer 31 to be connected to the first conductive holes 41, or It is 1 or 3 equals.

Referring to FIGS. 6 and 8, the conductive sheet further includes a second conductive sheet 42. One end of the second conductive sheet 42 is electrically connected to the transformer 31, and the other end protrudes from the board surface of the first circuit board 33 to the first circuit board 33. The edge is formed to form an outer conductive terminal 422 for connecting a second circuit board. The second conductive sheet 42 is used to electrically connect the transformer combined structure 21 and the second circuit board. In this embodiment, the second circuit board is the rectifier circuit board 22.

Preferably, the second conductive sheet 42 is provided with a positioning protrusion 421. The first circuit board 33 is provided with a positioning hole 333 for mounting the positioning protrusion 421, and the positioning protrusion 421 is inserted into the positioning hole 333. The second conductive sheet 42 is fixed to the first circuit board 33. Specifically, the positioning protrusion 421 is formed by bending one side edge of the conductive sheet 42 upward.

Specifically, the second conductive sheet 42 is provided with at least one conductive hole 423. The conductive pin 311 of the transformer 31 passes through the conductive hole 423 to electrically connect the second conductive sheet 42 with the transformer 31. More specifically, the first circuit board 33 is provided with a pin insertion hole 52 corresponding to the conductive hole 423. The corresponding conductive pin 313 of the transformer 31 passes through the conductive hole 423 and is inserted into the pin insertion hole 52. This solution further increases the stability and resistance to external forces of the transformer assembly structure 21. In this solution, a second conductive sheet 42 has a conductive hole 423. The number of the conductive holes 412 can be set by a technician as needed, or multiple. The number of the second conductive sheets 42 is two, and the number of the second conductive sheets 42 may be set by a technician as needed, or may be one, three or four.

Referring to FIG. 6 and FIG. 9 , the conductive sheet further includes a third conductive sheet 43 . The third conductive sheet 43 is electrically connected to the transformer 31 , and is provided with a plurality of conductive holes 432 , and the plurality of conductive holes 432 are respectively provided in the transformer 31 . The plurality of conductive pins 312 are correspondingly passed through, and the conductive pins 312 and the conductive holes 432 are soldered to electrically connect the conductive pins 312 and the conductive holes 432 to connect the plurality of corresponding conductive pins 312 of the transformer 31 ( The plurality of conductive pins corresponding to the third conductive sheet 43 are electrically connected. The third conductive sheet 43 is used to connect the conductive pins on the transformer 31. In this embodiment, the third conductive sheet 43 is provided with two conductive holes 432. The number of the conductive holes 432 can be set by the skilled person as needed, or can be three or four. The number of the third conductive sheets 43 is two, and the number of the third conductive sheets 43 may be set by the skilled person as needed, or may be one, three or four. Of course, the present invention can also electrically contact the conductive pin 312 with the hole wall of the conductive hole 432 or the third conductive piece 43 to electrically connect the third conductive piece 43 with the conductive pin 312 in the transformer 31.

Specifically, a positioning protrusion 431 is protruded from the third conductive sheet 43. The first circuit board 33 is provided with a positioning hole 334 for mounting the positioning protrusion 431. The positioning protrusion 431 is inserted into the positioning hole 333 to be the third. The conductive sheet 43 is fixed to the first circuit board 33. Specifically, the positioning protrusion 431 is formed by bending one side edge of the conductive sheet 43 upward.

Specifically, the first circuit board 33 is provided with a pin insertion hole 53 corresponding to the conductive hole 432. The corresponding conductive pin 312 of the transformer 31 passes through the conductive hole 432 and is inserted into the pin insertion hole 53.

Referring to FIGS. 2 and 3, the power supply device 2 further includes a main circuit board 23 on which the primary side circuit, the secondary side circuit, and the transformer combination structure 21 are mounted, on the primary circuit board 23, wherein the primary side circuit of the present embodiment Receiving an AC power source to step down the AC power source and output it to the output end of the transformer 31 of the transformer combination structure 21 (not shown), and the transformer 31 outputs the induction AC power source to the secondary side circuit (the rectifier circuit board 22 and the filter circuit) ) to convert to DC power. The first circuit board 33 is an auxiliary circuit board and is located on the side of the transformer 31 remote from the main circuit board 23. The first circuit board 33 and the main circuit board 23 are respectively located on opposite sides of the transformer 31, which effectively saves space in the power supply device 20 and improves the space utilization rate of the entire power supply device 20.

Referring to FIG. 6, the secondary circuit includes a rectifier circuit board 22 and a filter circuit (not shown). The rectifier circuit board 22 is provided with a pin slot 221 for inserting the external conductive terminal 422 of the second conductive sheet 42. The outer conductive terminal 422 is mounted in the pin slot 221 to electrically connect the conductive pin 311 of the transformer 31 to the induced voltage signal to the rectifier circuit board 22 through the second conductive strip 42 to deliver the induced voltage of the transformer 31 to the rectifier circuit. The board 22 is rectified, and the filter circuit includes a capacitor and an inductor element 32. Therefore, the transformer 31 of the present invention and the inductor element 32 of the filter circuit are electrically connected on the first circuit board 33 through the first conductive sheet 41, and the transformer 31 and the rectifier circuit. The board 22 passes through the second conductive sheet 42 electrical connection, no need to pass the copper foil printed circuit electrical connection, low effective power loss and save the use space of the main circuit board, making the main circuit board space utilization high.

More specifically, the rectifying circuit board 22 is provided with a conductive pin 222. The main circuit board 21 is provided with a jack for the conductive pin 222 to be inserted, so as to match the rectifying circuit board 22 with the main body through the cooperation of the conductive pin 222 and the jack. The circuit board 23 is electrically connected such that the main circuit board 23 obtains the induced voltage signal rectified by the rectifier circuit board 22 and transmits it to the inductance element 32 of the filter circuit. Referring to FIGS. 2 and 3, the rectifying circuit board 22 is vertically disposed with respect to the main circuit board 23 and the auxiliary circuit board 33, further saving space in the power supply device 20, and improving the space utilization rate of the entire power supply device 20.

The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, and the equivalent changes made by the scope of the present invention remain within the scope of the present invention.

21‧‧‧Transformer combination structure

22‧‧‧Rectifier Board

31‧‧‧Transformers

311, 312, 313‧‧‧ conductive pins

32‧‧‧Inductive components

321‧‧‧Electrical pins

33‧‧‧First board

331‧‧‧ first through hole

332‧‧‧Second through hole

41‧‧‧First conductive sheet

411‧‧‧First bump

421, 431‧‧‧ positioning bumps

Claims (11)

A transformer assembly structure comprising: a transformer; an inductance component; a first circuit board; and at least one conductive sheet mounted between the transformer and the first circuit board and including a first conductive sheet, One end of the first conductive sheet is electrically connected to the transformer, and the other end is convexly provided with a first bump. The first circuit board is provided with a first through hole for the first bump to pass through and the inductor element is provided. a first through hole passing through the first conductive pin, and the first conductive block and the first conductive pin of the inductive element respectively pass through the first through hole and the second through hole to protrude from On the first circuit board, the first circuit board between the first bump and the first conductive pin of the inductive component is provided with a first conductive lead electrically connecting the first bump and the inductor component a solder conductor of the foot, wherein the at least one conductive sheet further comprises a second conductive sheet, the second conductive sheet is electrically connected to the transformer at one end, and the other end extends along the edge of the first circuit board along the first circuit board To form an outer conductive terminal for the outer conductive terminal Connecting a second circuit board. The transformer assembly structure of claim 1, wherein the at least one conductive sheet is provided with at least one conductive hole, and a second conductive pin of the transformer correspondingly passes through the conductive hole and the at least one conductive sheet The second conductive pin is electrically connected to electrically connect the at least one conductive strip to the transformer. The transformer assembly structure of claim 2, wherein the at least one conductive sheet comprises a first conductive portion having the conductive hole, and the direction of the inductor element along the first conductive portion a second conductive portion extending longitudinally and a third conductive portion extending from a portion of the second conductive portion adjacent to the inductive component to a direction perpendicular to the inductive component, the first bump being protruded from the third conductive portion a transverse strip on the conductive portion, the first through hole being a long hole that mates with the lateral strip. The transformer assembly structure of claim 2, wherein the at least one conductive sheet further comprises a third conductive sheet, the third conductive sheet is provided with a plurality of conductive holes, and the plurality of conductive holes of the third conductive sheet A plurality of second conductive pins in the transformer are respectively passed through to electrically connect the plurality of corresponding second conductive pins of the transformer. The transformer assembly structure of claim 1, wherein the at least one conductive sheet is convexly provided with a positioning protrusion, and the first circuit board is provided with a positioning hole for mounting the positioning protrusion, and the positioning protrusion is inserted. The first protruding block is a positioning protrusion of the first conductive piece, and the first through hole is a corresponding positioning hole, and is disposed in the positioning hole. The transformer assembly structure of claim 5, wherein the positioning protrusion is formed by bending one side edge of the conductive sheet upward. The transformer assembly structure of claim 1, wherein the first via is adjacent to the second via such that the first bump is adjacent to the first conductive pin of the inductive component. The transformer assembly structure of claim 2, wherein the first circuit board is provided with a pin jack corresponding to the conductive hole, and the corresponding second conductive pin of the transformer passes through the conductive hole. And plugged into the pin jack. A power supply device includes: a transformer combination structure including a transformer, an inductor component, a first circuit board, and One less conductive sheet is mounted between the transformer and the first circuit board and includes a first conductive sheet, one end of the first conductive sheet is electrically connected to one end of the transformer, and the other end is convexly provided with a first a first through hole through which the first bump passes and a second through hole through which the first conductive pin of the inductive component passes, and the first The first conductive pin of the bump and the inductive component respectively protrude through the first through hole and the second through hole to protrude from the first circuit board, the first bump and the first of the inductive component The first circuit board between the conductive pins is provided with a solder conductive material electrically connecting the first bump and the first conductive pin of the inductor element; a primary side circuit is combined with the transformer One end is electrically connected; and a secondary side circuit is electrically connected to the other end of the transformer combination structure, wherein the primary side circuit, the secondary side circuit and the transformer are mounted on a main circuit board, the first circuit The board is an auxiliary circuit board and is located away from the main circuit board of the transformer a side, wherein the secondary circuit includes a rectifier circuit board, and the at least one conductive sheet further includes a second conductive sheet, one end of the second conductive sheet is electrically connected to the auxiliary circuit board, and the second conductive sheet is electrically connected The other end extends along the auxiliary circuit board to extend the edge of the auxiliary circuit board to form an outer conductive terminal, and the outer conductive terminal is electrically connected to the rectifier circuit board. The power supply device of claim 9, wherein the rectifier circuit board is provided with a pin slot for mounting the outer conductive terminal, and the outer conductive terminal is mounted in the pin slot for the transformer output A second conductive pin of the induced voltage signal is electrically connected to the rectifier circuit board through the second conductive sheet to deliver the induced voltage of the transformer to the rectifier circuit board for rectification. The power supply device of claim 10, wherein the rectifier circuit board is opened There is a conductive pin, and the main circuit board is electrically connected to the rectifier circuit board through the conductive pin to obtain a rectified induced voltage signal of the rectifier circuit board.