Adapter power supply

Abstract

An adapter power supply includes a circuit board, a power factor correction transistor, a bridge rectifier, a power factor correction inductor, a capacitor and a transformer. The circuit board has a first long side and a second long side parallel to each other. The power factor correction transistor is arranged on the circuit board and is close to the first long side. The bridge rectifier is arranged on the circuit board and is close to the second long side. The power factor correction inductor is arranged on the circuit board and has a first long axis. The first long axis is parallel to the first long side. The capacitor and the power factor correction inductor are arranged side by side on the circuit board along the width direction of the circuit board. The capacitor has a second long axis. The first long axis of the power factor correction inductor is parallel to the second long axis of the capacitor. The transformer is arranged on the circuit board and is located next to the power factor correction inductor and the capacitor.

Description

Technical Field

[0001] The invention relates to a power supply, and in particular to an adapter power supply. Background Art

[0002] Common adapter power supplies usually have components such as power factor correction transistors, bridge rectifiers, power factor correction inductors, capacitors, and transformers on their internal circuit boards. Moreover, the power that the adapter power supply can achieve mainly depends on the electrical parameters and size specifications of the above components.

[0003] Generally speaking, adapter power supplies are usually used in portable electronic devices such as laptops and game consoles. Therefore, the size of the adapter power supply itself is a point that consumers need to consider. In view of this, if the overall size of the adapter power supply can be reduced under the conditions of the same electrical parameters and size specifications, the portability of electronic products can be further improved to meet the needs of consumers.

[0004] Application Contents

[0005] The object of the present invention is to provide an adapter power supply, which can increase the area utilization rate of a circuit board to achieve the advantage of high power density.

[0006] An adapter power supply of the present invention includes a circuit board, a power factor correction (PFC) transistor, a bridge rectifier, a power factor correction inductor, a capacitor and a transformer. The circuit board has a first long side and a second long side parallel to each other. The power factor correction transistor is arranged on the circuit board and is close to the first long side. The bridge rectifier is arranged on the circuit board and is close to the second long side. The power factor correction inductor is arranged on the circuit board and has a first long axis. The first long axis is parallel to the first long side. The capacitor and the power factor correction inductor are arranged side by side on the circuit board along the width direction of the circuit board. The capacitor has a second long axis. The first long axis of the power factor correction inductor is parallel to the second long axis of the capacitor. The transformer is arranged on the circuit board and is located next to the power factor correction inductor and the capacitor.

[0007] Preferably, a distance between a first long axis of the power factor correction inductor and a second long axis of the capacitor is between 20 mm and 23 mm.

[0008] Preferably, the ratio of the length of the projection of the power factor correction inductor and capacitor on the circuit board to the length of the circuit board is between 0.2 and 0.4.

[0009] Preferably, the circuit board is divided into a first area, a second area and a third area in a length direction of the circuit board, and the power factor correction inductor and capacitor are located in the second area of ​​the circuit board.

[0010] Preferably, the power factor correction inductor comprises a magnetic core, which comprises a central column and two arms located on both sides of the central column, and each arm has an arc-shaped outer contour.

[0011] Preferably, the distance between the center of the central column and the outer edge of each arm portion is between 15 mm and 17 mm.

[0012] Preferably, the angle formed by the connection between the two ends of each arm and the axis of the central column is between 85° and 90°.

[0013] Preferably, a cross section of the middle column presents a shape of a circle with a portion cut off, and the area of ​​the cross section of the middle column is the same as the sum of the cross-sectional areas of the two arm portions.

[0014] Preferably, the ratio of the width to the length of the circumscribed rectangle of the magnetic core is between 0.6 and 0.65.

[0015] Preferably, the transformer is at a first distance from the power factor correction inductor, the transformer is at a second distance from the capacitor, and the difference between the first distance and the second distance does not exceed 5 mm.

[0016] Compared with the prior art, the adapter power supply of the present invention has a power factor correction inductor and a capacitor arranged side by side along the width direction of the circuit board. As a result, the long side of the circuit board can be shortened to increase the area utilization rate of the circuit board and save the overall volume of the adapter power supply. In addition, the bridge rectifier and the power factor correction inductor of the present invention are respectively arranged next to the first long side and the second long side relative to each other. Therefore, the high heat energy generated by the bridge rectifier and the power factor correction inductor can be dispersedly dissipated from the two opposite sides without the need to additionally configure redundant heat dissipation components to assist in heat dissipation, and the overall volume of the adapter power supply is further reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of an adapter power supply according to an embodiment of the present invention.

[0018] Figure 2 yes Figure 1 Schematic diagram of the disassembly and assembly of the power factor correction inductor of the adapter power supply.

[0019] Figure 3 yes Figure 2 Schematic diagram of a top view of the magnetic core of a power factor correction inductor.

[0020] Explanation of symbols

[0021] 100: Adapter power

[0022] 110: Circuit board

[0023] 112: First long side

[0024] 114: Second longest side

[0025] 117: District 1

[0026] 118: District 2

[0027] 119: District 3

[0028] 120: Power Factor Correction Transistor

[0029] 130: Bridge rectifier

[0030] 140: Power factor correction inductor

[0031] 142: First major axis

[0032] 144: Magnetic core

[0033] 1441: Middle Column

[0034] 1441a: Cross section

[0035] 1443: Arm

[0036] 146: Bracket

[0037] 150: Capacitor

[0038] 152: Second major axis

[0039] 160: Transformer

[0040] 170: Input plug

[0041] 180: Output

[0042] 190: Metal heat sink

[0043] 140a, 150a, 160a: Symmetrical center

[0044] L110, L144, L150: Length

[0045] W110, W144: Width

[0046] D1: Length direction

[0047] D2: Width direction

[0048] d1: first distance

[0049] d2: second distance

[0050] d3, d4: distance

[0051] θ: Angle

[0052] A1: Area

[0053] A2: Total cross-sectional area DETAILED DESCRIPTION

[0054] In order to explain the technical content and structural features of the present invention in detail, the following is further described in conjunction with embodiments and accompanying drawings.

[0055] With the advancement of technology, the size of portable electronic products is getting smaller and smaller, and these portable electronic products usually need to use adapter power to charge. Therefore, as the size of portable electronic products is getting smaller and smaller, the size and portability of the adapter power are gradually being valued. However, the power that the adapter power can apply is closely related to the size of its internal components. If you want to meet the high power requirements at the same time, it is likely that the size of the internal components cannot be reduced, which will affect the overall size of the adapter power. The following will explain in detail how to change the relative position relationship and shape between the components to make the adapter power have a smaller size and higher power density, so that it has better portability.

[0056] Figure 1 is a schematic diagram of an adapter power supply according to an embodiment of the present invention. Figure 1 In this embodiment, the adapter power supply 100 includes a circuit board 110, a power factor correction (PFC) transistor 120, a bridge rectifier 130, a power factor correction inductor 140, a capacitor 150 and a transformer 160. It should be noted that in this embodiment, the power factor correction transistor 120, the bridge rectifier 130, the power factor correction inductor 140, the capacitor 150 and the transformer 160 are all disposed on the circuit board 110. In addition, as Figure 1 As shown, the circuit board 110 has a first long side 112 and a second long side 114 parallel to each other. The positions and relative relationships of the above components on the circuit board 110 will be described in detail below.

[0057] Generally speaking, power factor correction transistors and bridge rectifiers are components that generate high heat. Therefore, in conventional adapter power supplies, power factor correction transistors and bridge rectifiers are usually configured together. Because power factor correction transistors and bridge rectifiers generate high heat during operation, heat dissipation structures such as heat sinks are required to assist in heat dissipation. However, the heat dissipation structure occupies a certain volume, which will prevent the volume of conventional adapter power supplies from being reduced.

[0058] In view of this, in the present embodiment, the power factor correction transistor 120 is located close to the first long side 112 of the circuit board 110. The bridge rectifier 130 is located close to the second long side 114. Of course, in other embodiments, the positions of the power factor correction transistor 120 and the bridge rectifier 130 in the length direction D1 of the circuit board 110 can be appropriately configured according to actual needs, as long as the power factor correction transistor 120 and the bridge rectifier 130 are respectively configured on the opposite sides (the first long side 112 and the second long side 114) of the circuit board 110, the present invention does not limit the positions of the power factor correction transistor 120 and the bridge rectifier 130 in the length direction D1 of the circuit board 110.

[0059] Moreover, in the present embodiment, the first long side 112 and the second long side 114 of the circuit board 110 are respectively provided with a vertical direction extending from the circuit board 110 (eg, Figure 1 The two metal heat sinks 190 are connected in a direction (in a direction), and the metal heat sinks 190 are respectively in contact with the power factor correction transistor 120 and the bridge rectifier 130, and the power factor correction transistor 120 and the bridge rectifier 130 are thermally coupled to the corresponding metal heat sinks 190. In this way, the heat energy of the power factor correction transistor 120 and the bridge rectifier 130 can be dissipated through the corresponding metal heat sinks 190 to increase the heat dissipation efficiency of both.

[0060] It should be noted that in other embodiments, the heat sink does not have to be perpendicular to the circuit board 110, as long as it is configured in a manner that can reduce the overall volume occupied by the adapter power supply 100. The present invention does not limit the material and configuration of the heat sink.

[0061] In short, in this embodiment, the power factor correction transistor 120 and the bridge rectifier 130 are configured separately. That is, the two components that generate high heat energy in the adapter power supply 100 of this embodiment are configured separately on opposite sides. Based on this design, there is no need to configure an additional heat dissipation structure with strong heat dissipation capability, such as fins. In this embodiment, only the corresponding metal heat sink 190 is used, which can effectively dissipate the heat energy generated by the power factor correction transistor 120 and the bridge rectifier 130 of this embodiment.

[0062] Please continue to refer to Figure 1 In this embodiment, the circuit board 110 is divided into a first area 117, a second area 118 and a third area 119 in the length direction D1 of the circuit board 110. It should be noted that in other embodiments, the first area 117, the second area 118 and the third area 119 may be unequally divided in the length direction D1 of the circuit board 110, as long as the length difference between the three areas is not too large, for example, the length difference does not exceed 10%. Of course, the present invention is not limited to this.

[0063] In this embodiment, if Figure 1 As shown, the power factor correction inductor 140 and the capacitor 150 are located in the second area 118 of the circuit board 110. The power factor correction inductor 140 is located close to the first long side 112, and the capacitor 150 and the power factor correction inductor 140 are arranged side by side on the circuit board 110 along the width direction D2 of the circuit board 110. Of course, in another embodiment not shown, the capacitor 150 can also be located close to the first long side 112, and the capacitor 150 and the power factor correction inductor 140 are also arranged side by side on the circuit board 110 along the width direction D2 of the circuit board 110. In short, the positions of the power factor correction inductor 140 and the capacitor 150 in the width direction D2 can be swapped, and the present invention is not limited thereto. In addition, in this embodiment, the ratio of the length L150 occupied by the projection of the power factor correction inductor 140 and the capacitor 150 on the circuit board 110 to the length L110 of the circuit board 110 is between 0.2 and 0.4. In this way, the length L110 of the circuit board 110 can be greatly reduced, so that the overall volume of the adapter power supply 100 can be reduced.

[0064] Further, in the present embodiment, the power factor correction inductor 140 also has a first long axis 142. The capacitor 150 also has a second long axis 152. Moreover, the first long axis 142 of the power factor correction inductor 140 is parallel to the first long side 112, and the second long axis 152 of the capacitor 150 is parallel to the first long axis 142 of the power factor correction inductor 140. In detail, the distance d3 between the first long axis 142 of the power factor correction inductor 140 and the second long axis 152 of the capacitor 150 is between 20 mm and 23 mm. In other words, the distance d3 between the power factor correction inductor 140 and the capacitor 150 in the width direction D2 of the present embodiment should not be too far, so as not to increase the width W110 of the circuit board 110. In other words, the power factor correction inductor 140 and the capacitor 150 in the present embodiment are parallel and arranged side by side along the first long axis 142 and the second long axis 152 in the width direction D2, respectively, and the distance between the two is close. In this way, the area utilization rate of the circuit board 110 of this embodiment can be improved.

[0065] In addition, in this embodiment, the adapter power supply 100 further includes an input plug 170 and an output terminal 180. The input plug 170 is disposed in the first area 117 of the circuit board 110, and the output terminal 180 is disposed in the third area 119 of the circuit board 110. Of course, in other embodiments not shown, the actual positions of the input plug 170 and the output terminal 180 may not necessarily be arranged in the same area. Figure 1 The positions are shown, and the invention does not limit the forms of the input plug 170 and the output terminal 180 .

[0066] On the other hand, in this embodiment, the transformer 160 is disposed in the third area 119 of the circuit board 110 and is located next to the power factor correction inductor 140 and the capacitor 150. Figure 1 As shown, the symmetric center 160a of the transformer 160 of the present embodiment is separated from the symmetric center 140a of the power factor correction inductor 140 by a first distance d1. The symmetric center 160a of the transformer 160 is separated from the symmetric center 150a of the capacitor 150 by a second distance d2. Moreover, the difference between the first distance d1 and the second distance d2 does not exceed 5 mm. In short, the transformer 160 of the present embodiment is disposed in the third area 119 on the circuit board 110, and is adjacent to the positions of the power factor correction inductor 140 and the capacitor 150. Moreover, the first distance d1 between the transformer 160 and the power factor correction inductor 140 and the second distance d2 between the transformer 160 and the capacitor 150 are approximately the same. In this way, such a configuration can make the arrangement between the transformer 160, the power factor correction inductor 140 and the capacitor 150 close, and can increase the area utilization rate of the circuit board 110.

[0067] It is worth mentioning that, generally speaking, an inductor is an electromagnetic induction component, and its inductance is proportional to its magnetic conductive part ( Figure 2 The inductance value is proportional to the magnetic permeability of the magnetic component, the square of the number of turns of the coil winding and the equivalent magnetic circuit cross-sectional area, and is inversely proportional to the equivalent magnetic circuit length. It should be noted that in this embodiment, the magnetic component is, for example, the magnetic core 144 ( Figure 2 ), but the present invention does not limit the type and material of the magnetic conductive member. Based on the above premise, in this embodiment, it will be described how to change the shape of the magnetic core 144, increase the equivalent magnetic circuit cross-sectional area and reduce the equivalent magnetic circuit length without occupying too much area of ​​the circuit board 110, so that the power factor correction inductor 140 of this embodiment can use better space utilization.

[0068] Figure 2 yes Figure 1 Schematic diagram of the disassembly and assembly of the power factor correction inductor of the adapter power supply. Figure 3 yes Figure 2 A top view of the core of a power factor correction inductor. Figure 2 and Figure 3In this embodiment, the power factor correction inductor 140 includes two magnetic cores 144 and a bracket 146 for winding a coil (not shown). The bracket 146 is assembled between the two magnetic cores 144. Each magnetic core 144 includes a central column 1441 and two arms 1443 located on both sides of the central column 1441, and each arm 1443 has an arc-shaped outer contour. When the two magnetic cores 144 are combined together, the coil is suitable for being located in the space between the two arms 1443 and the central column 1441. The area A1 of a cross-section 1441a of the central column 1441 is the same as the total cross-sectional area A2 of the two arms 1443. In addition, the distance d4 between the center of the central column 1441 and the outer edge of each arm 1443 is between 15 mm and 17 mm.

[0069] Compared to the conventional magnetic core which is close to a long rectangle and has a longer length, the magnetic core 144 of the present embodiment reduces the distance between the two arms 1443 and extends the two arms 1443 obliquely upward and downward to resemble two opposite arc shapes, so that the two arms 1443 still have a sufficient area, that is, even if the shape is changed, the total cross-sectional area A2 can still be the same as or close to the area A1 of the cross-sectional surface 1441a of the middle column 1441 of the magnetic core 144. In practice, when the angle θ formed by the connection between the two ends of each arm 1443 of the magnetic core 144 and the axis of the middle column 1441 is between 85° and 90°, the magnetic core 144 can still maintain a small size in the width direction, and the total cross-sectional area A2 can also be the same as or close to the area A1 of the cross-sectional surface 1441a of the middle column 1441 of the magnetic core 144.

[0070] In addition, compared to the conventional magnetic core presenting a long and narrow rectangle, in the present embodiment, due to the reduction in the distance between the two arms 1443 of the magnetic core 144, the ratio of the width W144 to the length L144 of the circumscribed rectangle of the magnetic core 144 is between 0.6 and 0.65. Based on this design, the length L144 of the circumscribed rectangle of the magnetic core 144 of the present embodiment is shorter than that of the conventional magnetic core, so that the ratio of the width W144 to the length L144 is larger. Therefore, the power factor correction inductor 140 of the present embodiment significantly reduces the length of the circuit board 110 occupied. In this way, the size of the circuit board 110 in the length direction can be effectively reduced.

[0071] In addition, in the present embodiment, the cross section 1441a of the middle column 1441 presents a circular shape with a portion cut off. In detail, the reason why the middle column 1441 of the present embodiment presents a circular shape with a portion cut off is that in the present embodiment, the magnetic flux of the magnetic core 144 depends on the smaller of the area A1 of the cross section 1441a of the middle column 1441 and the total cross-sectional area A2 of the two arm portions 1443. In short, if the cross section 1441a of the middle column 1441 of the present embodiment is a complete circle (not shown), its area A1 will be greater than the total cross-sectional area A2 of the two arm portions 1443, however, the magnetic flux will still depend on the total cross-sectional area A2 of the two arm portions 1443. Therefore, in the present embodiment, a portion of the circular shape of the cross section 1441a of the middle column 1441 is cut off to avoid taking up extra space and wasting materials.

[0072] Of course, in other embodiments not shown, as long as the area of ​​the cross-section 1441a of the middle column 1441 is designed to be close to the total cross-sectional area A2 of the two arm portions 1443, the shape of the cross-section 1441a of the middle column 1441 is not limited thereto. In addition, even if a part of the cross-section 1441a of the middle column 1441 is not cut off, it will not affect the magnetic flux of the magnetic core 144. Therefore, the present invention is not limited thereto.

[0073] It is worth mentioning that, for example, the size of the adapter power supply 100 of the present embodiment is approximately: length 140.1 mm, width 65.1 mm, thickness 25.4 mm. The size of the old adapter power supply is approximately: length 151.3 mm, width 75.6 mm, thickness 25.4 mm. Therefore, under the condition that the thickness of the adapter power supply 100 of the present embodiment is the same as that of the old adapter power supply, the volume of the adapter power supply 100 of the present embodiment is reduced by about 20%. Moreover, if it is assumed that the power of the adapter power supply 100 of the present embodiment and the old adapter power supply are both 180W, the power density of the adapter power supply 100 of the present embodiment is approximately 12.7 (W / m3), and the power density of the old adapter power supply is 10.15 (W / m3). In short, the power density of the adapter power supply 100 of the present embodiment is improved by about 25% compared with the old adapter power supply.

[0074] In addition, it should be noted that in other embodiments, the detailed size of the adapter power supply 100 of this embodiment may have slight errors, and the power and power density of the above-mentioned adapter power supply 100 are only examples. The present invention does not limit the detailed size, power and power density of the adapter power supply 100.

[0075] In summary, in the adapter power supply of the present invention, the power factor correction inductor and capacitor are arranged side by side along the width direction of the circuit board. In this way, the long side of the circuit board can be shortened to save the overall volume of the adapter power supply. In addition, the bridge rectifier and the power factor correction inductor of the present invention are respectively arranged beside the first long side and the second long side relative to each other. Therefore, the high heat energy generated by the bridge rectifier and the power factor correction inductor can be dispersedly dissipated from the two opposite sides without the need to additionally configure redundant heat dissipation components to assist in heat dissipation, and the overall volume of the adapter power supply is further reduced.

[0076] The above disclosure is only a preferred embodiment of the present invention, which cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are all within the scope of the present invention.

Claims

1. An adapter power supply, characterized in that: include: A circuit board having a first long side and a second long side parallel to each other; a power factor correction transistor, disposed on the circuit board and close to the first long side; a bridge rectifier, disposed on the circuit board and close to the second long side; a power factor correction inductor, disposed on the circuit board and having a first long axis, wherein the first long axis is parallel to the first long side; a capacitor, arranged on the circuit board side by side with the power factor correction inductor along the width direction of the circuit board, the capacitor having a second long axis, the first long axis of the power factor correction inductor being parallel to the second long axis of the capacitor; and a transformer, disposed on the circuit board and located next to the power factor correction inductor and the capacitor, The first long side and the second long side of the circuit board are also respectively provided with metal heat sinks, and the metal heat sinks are respectively in contact with the power factor correction transistor and the bridge rectifier, the transformer is at a first distance from the power factor correction inductor, and the transformer is at a second distance from the capacitor, and the difference between the first distance and the second distance does not exceed 5 mm.

2. The adapter power supply according to claim 1, characterized in that: A distance between the first long axis of the power factor correction inductor and the second long axis of the capacitor is between 20 mm and 23 mm.

3. The adapter power supply according to claim 1, wherein: The ratio of the length of the projections of the power factor correction inductor and the capacitor on the circuit board to the length of the circuit board is between 0.2 and 0.

4.

4. The adapter power supply according to claim 1, wherein: The circuit board is divided into a first area, a second area and a third area in a length direction of the circuit board, and the power factor correction inductor and the capacitor are located in the second area of ​​the circuit board.

5. The adapter power supply according to claim 4, characterized in that: The invention also includes an input plug located in the first area of ​​the circuit board, and the transformer is located in the third area of ​​the circuit board.

6. The adapter power supply according to claim 1, wherein: The power factor correction inductor comprises a magnetic core, which comprises a middle column and two arms located on both sides of the middle column, and each arm has an arc-shaped outer contour.

7. The adapter power supply according to claim 6, wherein: The distance between the center of the central column and the outer edge of each arm portion is between 15 mm and 17 mm.

8. The adapter power supply according to claim 6, wherein: The angle formed by the connection between the two ends of each arm and the axis of the central column is between 85° and 90°.

9. The adapter power supply according to claim 6, wherein: A cross section of the center column presents a shape of a circle with a portion cut off, and the area of ​​the cross section of the center column is the same as the sum of the cross-sectional areas of the two arm portions.

10. The adapter power supply according to claim 6, wherein: The ratio of the width to the length of the circumscribed rectangle of the magnetic core is between 0.6 and 0.65.

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