TWI398883B - Multi-output choke coil - Google Patents

Description

Multiple output choke

This invention relates to a choke, and more particularly to a multi-output choke.

Power supply is widely used in various electrical appliances. Its main function is the conversion between AC and DC, such as AC to DC, DC to DC, DC to AC, AC to AC. The most common form is AC to DC or DC to DC, and the output power is DC, because the circuits or components inside many electrical appliances need to be supplied with DC power.

For example, the power supply plays a very important role in order for the desktop device to boot up smoothly. FIG. 1 is a schematic diagram of a conventional power supply. Referring to FIG. 1, a conventional power supply 100 can include an input rectifier 102, a transformer 104, and rectifiers 106-112. The input rectifier 102 is configured to rectify the input AC voltage AC (for example, an AC voltage of 110-240 V) to output an operating voltage WV1 to the transformer 104, and the transformer 104 receives the rectified operating voltage WV1 and converts it into four different DC voltages. DC1~DC4, the rectifiers 106~112 rectify the DC voltages DC1~DC4 respectively to output DC voltages DCO1~DCO4 (for example, DC voltages of +12V, +5V, -12V, 3.3V). Since the conventional power supply 100 uses the rectifiers 106-112 to rectify the output DC voltage, and each rectifier requires a different chock coil to output a different DC voltage, the conventional power supply 100 requires multiple turbulence. In order to cooperate with the output of different DC voltages, the production cost is increased and the product volume is reduced.

The present invention provides a multiple output choke that reduces the number of parts required to produce a power supply and the volume of the power supply.

The invention provides a multiple output choke comprising a magnetic core, a first choke coil, a second choke coil and a third choke coil. The magnetic core is surrounded by an inner coil layer, and the inner coil layer is surrounded by an outer coil layer, and the self-inductance value of the choke coil included in the inner coil layer is larger than the self-inductance value of the choke coil included in the outer coil layer. . The first choke coil has a first number of coils, and the first choke coil belongs to the inner coil layer and surrounds the magnetic core. The second choke coil has a second number of coils and surrounds the magnetic core, wherein the first coil number and the second coil number have a first difference therebetween. In addition, the third choke coil has a third coil number, and the third choke coil belongs to the outer coil layer and surrounds the magnetic core, wherein the second coil number two and the second three coil numbers have a second difference, wherein If the first difference is less than or equal to the second difference and a preset value, the second choke coil belongs to the inner coil layer, and if the first difference is greater than the second difference, the second difference is less than the preset value, then the second The choke coil belongs to the outer coil layer.

In an embodiment of the invention, the self-inductance value of the first coil is greater than the self-inductance value of the third coil.

In an embodiment of the invention, the absolute value of the at least one of the first difference and the second difference is less than 3.

In an embodiment of the invention, the inner coil layer includes a first coil and a second coil, and the inner coil layer has a first region and a second region, wherein the first region is located between the magnetic core and the second region The first coil is located in the first area and the second area, and the second coil is located in the second area.

In an embodiment of the invention, the inner coil layer includes a first coil and a second coil, the second coil surrounds the first coil, and the first and second coils are alternately wound around the magnetic core.

In an embodiment of the invention, the multiple output choke further includes a bobbin, and the coil is wound around the bobbin.

In an embodiment of the invention, the magnetic core further includes a first member and a second member. The first member has at least one first protruding portion and a first engaging portion, and the first engaging portion is bored in the spool. The second member has a plurality of contact faces, and the first protruding portion and the first fitting portion are respectively in contact with the contact surface.

In an embodiment of the present invention, the second member has at least one second protrusion and a second fitting portion, the second fitting portion is disposed in the spool and is in contact with the first fitting portion, and The contact faces are located at the second protrusion and the second fitting.

In an embodiment of the invention, the multiple output choke further includes a fixing member disposed on one side of the magnetic core. The fixing member includes a plurality of pins and a plurality of guide grooves. The above stitches are away from the magnetic core protrusion. The guiding groove is located between the pin and the magnetic core, and the wires of the first coil, the second coil and the third coil pass through the corresponding guiding grooves to contact the corresponding pins.

In an embodiment of the invention, the multiple output choke further includes a frame sleeved on the fixing member.

In an embodiment of the invention, the multiple output choke further includes a housing and a fixing member. The magnetic core can be accommodated in the housing, and the magnetic core is a cylinder, and the fixing member is disposed on one side of the housing. The fixing member includes a plurality of pins and a plurality of guiding grooves. The above stitches are away from the magnetic core protrusion. The guiding groove is located between the pin and the magnetic core, and the wires of the first coil, the second coil and the third coil pass through the corresponding guiding grooves to contact the corresponding pins.

The invention provides a multiple output choke comprising a magnetic core, a first coil and a second coil. The magnetic core contains a cylinder. The first coil has a first number of coils and the second coil has a second number of coils. The first coil number and the second coil number have a first difference value, and the absolute value of the first difference value is less than a preset value. In addition, the first coil and the second coil are alternately stacked and wound on the cylinder of the magnetic core.

In an embodiment of the invention, the preset value is 3.

In an embodiment of the invention, the multiple output choke further includes a fixing member disposed on one side of the magnetic core, and the fixing member has a plurality of guiding grooves, wherein the first coil, the second coil and/or the third coil The wire ends pass through the corresponding guide slots and act as pins for the multiple output choke.

In an embodiment of the invention, the multiple output choke further includes a fixing member disposed on one side of the magnetic core. The fixing member has a plurality of guiding slots, and the opening aperture of the at least one guiding slot is slightly smaller than the diameter of the coil passing through the guiding slot, and the coil is inserted into the guiding slot by the opening.

Based on the above, the present invention utilizes a coil having a coil number close to each other and wraps together, and winds a coil having a large self-inductance value around a coil layer closer to the magnetic core, so that a single choke can output different DC voltages. , reducing the number of parts required to produce a power supply and the volume of the power supply.

The above described features and advantages of the present invention will be more apparent from the following description.

Exemplary embodiments of the present invention will be described in the following, in which the same reference numerals are used to refer to the same or similar elements. In addition, the following exemplary embodiments are merely illustrative, and are not intended to limit the invention.

2 is a cross-sectional view of the winding group of FIG. 6A taken along line AA', in accordance with an embodiment of the invention. Referring to FIG. 2, an embodiment of the present invention discloses a multiple output choke that can output different voltages, including a magnetic core 202 and a plurality of coils 204, 206, 208, 210 wound on the magnetic core 202. The winding of the coil is such that the coils having the number of coil turns are divided into the same coil layer. In detail, the magnetic core 202 is surrounded by an inner coil layer 212, and the inner coil layer 212 is surrounded by an outer coil layer 214. The plurality of coils are, for example, a first coil, a second coil, and a third coil. The first coil has a first number of coils and belongs to the inner coil layer 212 and surrounds the magnetic core 202. The third coil has a third number of coils and belongs to the outer side. The coil layer 214 surrounds the magnetic core 202. The second coil has a second number of coils and surrounds the magnetic core, wherein the first coil number and the second coil number have a first difference, and the third coil number and the second coil number have a second difference If the first difference is less than or equal to the second difference, the second coil belongs to the inner coil layer 212, and if the first difference is greater than the second difference, the second coil belongs to the outer coil layer 214. Preferably, the coil having a large self-inductance value is wound around the inner layer of the magnetic core 202, that is, the self-inductance value of the first coil is greater than the self-inductance value of the third coil. The absolute value of the difference between the first difference and the second difference is less than a preset value. In this embodiment, the preset value is 3. By winding multiple coils on the same core and outputting different voltages to each coil, the number of parts required to produce the power supply and the volume occupied by the power supply are reduced.

Table 1 shows the coils, coil turns, operating current, wire diameter and pumping conditions corresponding to different working voltages. The working voltage and the pumping current are the conditions commonly used in desktop computers on the market today. The specifications of the power supply shown in Table 1 will be exemplified below, but the application of the present invention should not be limited thereby. Those of ordinary skill in the art can apply the embodiments described below to the specifications of other power supplies.

Various structural examples of the multiple output choke will be schematically illustrated below with reference to FIGS. 2 to 11C. That is to say, the number of turns of the coils shown in these figures is for reference only. Applicants of the present invention must determine the number of turns, wire diameter and winding manner of each coil in the figures according to the design requirements of actual product specifications (for example, as shown in Table 1) to adjust the self-inductance and leakage inductance between the coils. And mutual inductance to meet the specifications.

In detail, since the number of turns of the coils 204, 208 of FIG. 2 is 28 and 27, respectively, and the number of turns of the coils 206, 210 is 12 and 10, respectively, the coil 204 (ie, the first coil) and the coil 208 (ie, the second The first difference in the number of turns between the coils (= 28-27 = 1) is less than the second difference between the number of turns between the coil 206 (ie, the third coil) and the coil 208 (the second coil) (= 27-12 =15), the first difference is less than 3, and the self-inductance value of the coil 204 is greater than the self-inductance value of the coil 206. Moreover, the first difference (=27-12=15) between the coil 208 (ie, the first coil) and the coil 206 (ie, the second coil) is greater than the coil 210 (ie, the third coil) and the coil 206. a second difference (=12-10) between the turns of the second coil (the second coil), the second difference is less than 3, and the self-inductance value of the coil 208 is greater than the self-inductance value of the coil 210; therefore, the coil 204, 208 is divided into inner coil layers 212, and coils 206, 210 are divided into outer coil layers 214.

The coil winding of the inner coil layer 212 can divide the inner coil layer 212 into a first region 216 and a second region 218, and the first region 216 is located between the magnetic core 202 and the second region 218. The coil 204 is wound in the first region 216 and the second region 218, and the coil 208 is wound in the second region 218, that is, the second region 218 includes two coils of the coil 204 and the coil 208. As shown in FIG. 2, the coil wound in the second region 218 is divided into two sides, one side winding the coil 204 and the other side winding the coil 208. In addition, the outer coil layer 214 is wound around the inner coil layer 212 before the coil 206 is wound, and then the coil 210 is wound around the coil 206.

Table 2 shows the operating voltage, self-inductance, leakage inductance and output voltage of the coils 204-210 according to the winding mode of Fig. 2 under the pumping condition 2.

By using the coil winding method of the embodiment, the maximum leakage inductance value of the coils 204-210 can be reduced to 1.09 μH, thereby effectively reducing the leakage inductance value of the coil, so that the output voltage of the coils 204-210 meets the specifications of the power supply operating voltage. .

3 is a cross-sectional view showing a magnetic core and a coil of a multiple output choke according to another embodiment of the present invention. Referring to FIG. 3, the difference between this embodiment and the embodiment of FIG. 2 is the manner in which the coils 204, 208 are wound in the inner coil layer 212. In this embodiment, the coils 204 and 208 are wound in such a manner that the coils 204 and 208 are alternately wound and wound on the magnetic core 202 from the inside to the outside, that is, the coil 204 is wound on the magnetic core 202, and then wound. The coil 208 is on the coil 204, and then the coil 204 is wound on the coil 208, so that the windings 204, 208 are alternately repeated on the magnetic core 202 to form the inner coil layer 212.

Table 3 shows the operating voltage, self-inductance, leakage inductance and output voltage of the coils 204-210 according to the winding mode of Fig. 3 under the pumping condition 2.

With the coil winding method of the embodiment, except that the maximum leakage inductance value in the coils 204 to 210 can be reduced to 1.10 μH, the interlaced winding between the coil 204 and the coil 208 is wound so that the arrangement between the coils is tighter, and the magnetic core 202 is reduced. The volume after winding the coil, and the output voltage of the coils 204~210 meet the specifications of the power supply operating voltage.

Additionally, in some embodiments, the manner in which the coils 206, 210 in the outer coil layer 214 are wound can be varied to adjust the voltage output of the multiple output choke. 4 is a cross-sectional view showing a magnetic core and a coil of a multiple output choke according to another embodiment of the present invention. Referring to FIG. 4, the difference between this embodiment and the embodiment of FIG. 3 is the manner in which the coils 206, 210 in the outer coil layer 214 are wound. In the present embodiment, the windings of the coils 206, 210 are wound before the coil 210 is wound on the inner coil layer 212, and then the coil 206 is wound around the coil 210 so that the coil 206 is wound around the outermost layer.

Table 4 shows the operating voltage, self-inductance, leakage inductance and output voltage of the coils 204-210 according to the winding mode of Fig. 4 under the pumping condition 2.

With the coil winding method of the embodiment, the leakage inductance value in the coil 206 can be reduced to 0.47 μH, so that the output voltage of the coils 204 to 210 conforms to the specifications of the power supply operating voltage.

Additionally, in some embodiments, the manner in which the coils 204, 208 in the inner coil layer 212 are wound can be varied to adjust the output voltage of the multiple output choke. 5 is a cross-sectional view showing a magnetic core and a coil of a multiple output choke according to another embodiment of the present invention. Referring to FIG. 5, the difference between this embodiment and the embodiment of FIG. 4 is the manner in which the coils 204, 208 are wound in the inner coil layer 212. In this embodiment, the inner coil layer 212 is wound by winding a layer of the coil 208 on the magnetic core 202, then winding the coil 204 on the coil 208, and then coil 208 on the coil 204, and repeatedly winding the coil 204. 208 is on the magnetic core 202 to form the inner coil layer 212. Thus changing the order in which the coils 204, 208 are wound around the magnetic core 202 adjusts the output voltage of the multiple output choke.

It should be noted that, in order to facilitate the description of the winding manner of the coil, the embodiment of FIGS. 2 to 5 does not show the complete number of coils of each coil, and those having ordinary knowledge in the art should be able to derive from the description of the embodiment. The winding method of the coil having more coil numbers is known. Further, the winding method of the inner coil layer 212 and the outer coil layer 214 in the above embodiment is not limited to the coils in the inner coil layer 212 and the outer coil layer 214.

In practical applications, the multiple output choke can include device A as in Figure 6A. FIG. 6A is a schematic diagram showing the combination of multiple output chokes according to an embodiment of the invention. Figure 6B is an exploded view of the multiple output choke of Figure 6A. Referring to FIG. 6A and FIG. 6B simultaneously, the multiple output choke 600 includes a fixing member 602, a first member 604A, a second member 604B, and a winding group 606. The winding group 606 includes a bobbin (Bobbin). 608 and a plurality of coils 204-210 wound around the spool 608. The winding manner of the coils 204 to 210 wound around the spool 608 is disclosed, for example, in FIGS. 2 to 5, and thus will not be described herein. The first member 604A and the second member 604B constitute a magnetic core of the multiple output choke 600, and the winding group 606 is disposed in the magnetic core.

In detail, the first member 604A has a protruding portion P1 and a fitting portion S1, and in the present embodiment, the first member 604A is an E-shaped core material. The second member 604B has a contact surface F1 and a contact surface F2. In the present embodiment, the second member 604B is a cylinder, and the contact surface F1 and the contact surface F2 are located on the same surface of the cylinder. The fitting portion S1 of the first member 604A can be inserted into the bobbin 608 to be in contact with the corresponding contact surface F2, and the protruding portion P1 is disposed on the outer layer of the coil and is in contact with the corresponding contact surface F1 to form a magnetic circuit of the closed magnetic path. Rui. The fixing manner of the first member 604A and the second member 604B can be utilized for dispensing the contact surface to bond, or the first member 604A and the second member 604B are combined and then fixed by tape bonding.

In some embodiments, the second member 604B can also have a projection and a fitting as the first member 604A. 7 is an exploded view of a multiple output choke according to another embodiment of the present invention. Referring to FIG. 7, the multiple output choke 700 of the present embodiment is different from the multiple output choke 600 of FIG. 6 in that the third member 702 in contact with the first member 604A also has a protrusion as the second member 604B. The portion P1B and the fitting portion S1B, and the contact faces F1 and F2 are respectively located on the corresponding protruding portion P1B and the fitting portion S1B. In the present embodiment, the third member 702 is an E-shaped core material that is identical in symmetry with the first member 604A, and the fitting portion S1B of the third member 702 and the fitting portion S1 of the first member 604A are bored in the spool 608. And in contact with each other in the spool 608. In addition, the protruding portion P1B is also in contact with the corresponding protruding portion P1, and the connection and fixing manner of the first member 604A and the third member 702 can be the same as the embodiment of FIG. 6B, and details are not described herein again.

It should be noted that the plurality of coils may be wound on the spool 608 first, and then combined with the first member 604A and the second member 604B (or the third member 702), thereby automating the step of winding the coil. The winding operation of the coil is simplified, and the shape of the first member 604A, the second member 604B (or the third member 702) is prevented from causing an obstacle to automation of the winding operation.

Referring to FIG. 6B, the fixing member 602 is disposed on one side of the magnetic core and is engaged with the magnetic core. The fixing member 602 includes a plurality of stitches N1 away from the magnetic core protrusions, and a plurality of guide grooves T1. The guiding groove T1 is located between the stitch N1 and the magnetic core. The coil wound on the winding group 606 can be in contact with the corresponding stitch N1 through the corresponding guiding groove T1. For example, the coil can be wound on the stitch N1 to pass through the stitch. The magnetic core and the fixing member 602 are electrically connected and reinforced. It should be noted that the aperture of the guiding slot T1 may be slightly larger than the diameter of the coil, and the depth of the guiding slot T1 may be larger than the aperture of the guiding slot T1, so that the coil is more easily placed in the guiding slot T1. In some embodiments, the opening of the restricting guide groove T1 is appropriately limited to help fix the coil in the guide groove T1 to prevent the coil from coming off the guide groove T1.

FIG. 8A is a schematic diagram showing the combination of multiple output chokes according to another embodiment of the present invention. Figure 8B is a partial exploded view of the multiple output choke of Figure 8A. Referring to FIG. 8A and FIG. 8B simultaneously, the multiple output choke 800 is different from the multiple output choke 600 of FIG. 6A in that the multiple output choke 800 further includes a frame 802. The frame 802 can be sleeved on the fixing member 602. When the coils 204 to 210 of the winding group 606 are disposed in the corresponding guiding grooves T1, the frame 802 is sleeved to more effectively prevent the coil from coming out of the guiding groove T1.

In addition, the position and the number of the stitches N1 and the guide groove T1 in this embodiment can be changed within a reasonable range according to the actual situation. FIG. 9A is a schematic diagram showing the combination of multiple output chokes according to another embodiment of the present invention. Figure 9B is a partial exploded view of the multiple output choke of Figure 9A. The multiple output choke 900 of FIGS. 9A, 9B differs from the multiple output choke 800 in the number of pins N1 on the fixture 902. When the wire diameter of the coil is sufficiently thick, the corresponding pin N1 can be omitted, and the coil is directly connected to the outside by the coil N1, and the opening aperture of the guiding groove T1 can be slightly smaller than the wire diameter of the coil, so that the coil is opened. After being inserted into the guide groove T1, it can be fixed in the guide groove T1. As shown in FIG. 9A and FIG. 9B, the stitches 208 having a smaller diameter are used, and the number of pins on the fixing member 902 is reduced to two, so that the coil 208 is electrically connected to the outside. In other embodiments, the fixture 602 may even dispense with all of the stitches N1 in the case where the wire diameters of all of the coils on the winding set 606 are sufficiently thick. In this way, the action of manually winding the coil on the stitch N1 can be omitted, saving labor costs, simplifying the manufacturing process, and shortening the process time. It should be noted that the choke 900 further includes a frame 802. The frame 802 can be sleeved on the fixing member 602. When the coils 204 to 210 of the winding group 606 are disposed in the corresponding guiding slots T1, the frame is placed. The body 802 is more effective in preventing the coil from coming out of the guide groove T1.

FIG. 10 is a schematic diagram of a multiple output choke according to another embodiment of the present invention. Referring to FIG. 10, the multiple output choke 1000 of the present embodiment is different from the multiple output choke 600 in that the magnetic core of the multiple output choke 1000 is a cylinder 1002, and the cylinder 1002 is surrounded by a plurality of coils. Winding. Since the cylinder 1002 does not have the protrusion P1 of the first member 604A in FIG. 6, there is no problem of the automation obstacle of the embodiment of FIG. 6 in the automation of the winding operation, and the coil can be directly wound on the cylinder 1002, It is necessary to first wind the reel and then thread the cylinder 1002 into the reel. In addition, the multiple output choke 1000 further includes a housing 1004 disposed on one side of the fixing member 602, and the magnetic core and the coil are accommodated in the housing 1004. Two symmetric grooves can be designed inside the housing 1004. So that both ends of the cylinder 1002 can be engaged in the groove, so that the magnetic core and the coil can be fixedly held in the casing 1004. In addition, the coil wound on the cylinder 1004 can also be in contact with the corresponding stitch N1 through the corresponding guiding groove T1 to electrically connect and strengthen the fixing of the magnetic core. It should be noted that the cross-sectional shape of the above-mentioned cylinder 1002 is not limited to the elliptical shape shown in the drawing, and other shapes may also be applicable, such as a circular shape, a semi-circular arc, a triangle, a rectangle, a trapezoid, a pentagon, a hexagon, and eight. An angle, an equilateral polygon, or an unequal polygon.

11A-11C are schematic diagrams showing the winding of the winding group 606 according to an embodiment of the invention. The step of winding the coils 204-210 onto the spool 608 can be as follows: First, the coils 204, 208 having large self-inductance values and close turns are wound around the spool 608, that is, an automated winding can be used. The machine winds two coils 204 and 208 on the spool 608 at the same time. As shown in FIG. 11A, when the coils 204, 208 of the first layer are wound using an automated winding machine, the coils 208 having a thinner diameter are closer to the spool 608. Next, the automated winding machine rewinds the second layer of coils 204, 208 on the previously wound coils 204, 208, except that the second wound coils 204, 208 are closer to the coils of the spool 608. It is a coil 204 having a relatively large wire diameter. After the coils 204, 208 are wound, the automated winding machine then rewinds the coil 206 (as shown in Figure 11B). Finally, the automated winding machine rewinds the coil 210 to the outermost layer (as shown in FIG. 11C) to complete the winding operation of the winding set 606. 11A-11C are merely illustrative embodiments and are not intended to limit the invention.

In summary, the present invention utilizes a coil having a number of turns close to each other, and winds a coil having a large self-inductance value to a position closer to the magnetic core, so that the multiple output choke can output different DC voltages. , reducing the number of parts required to produce a power supply and the volume of the power supply.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

100‧‧‧Power supply

102‧‧‧Input rectifier

104‧‧‧Transformers

106~112‧‧‧Rectifier

AC‧‧‧AC voltage

WV1‧‧‧ working voltage

DC1~DC4‧‧‧ DC voltage

DCO1~DCO4‧‧‧ output DC voltage

202‧‧‧ magnetic core

204~210‧‧‧ coil

212‧‧‧Inside coil layer

214‧‧‧Outer coil layer

216‧‧‧First area

218‧‧‧Second area

600, 700, 800, 900, 1000‧‧‧ multiple output chokes

602, 902‧‧‧ fixing parts

604A‧‧‧ first component

604B‧‧‧Second component

606‧‧‧ Winding Group

608‧‧‧Wire spool

P1, P1B‧‧‧ protruding parts

S1, S1B‧‧‧Mate

F1, F2‧‧‧ contact surface

702‧‧‧ third component

N1‧‧‧ stitches

T1‧‧

802‧‧‧ frame

1002‧‧‧ cylinder

1004‧‧‧shell

FIG. 1 is a schematic diagram of a conventional power supply.

2 is a cross-sectional view taken along line AA' of FIG. 6A.

3 is a cross-sectional view showing a magnetic core and a coil of a multiple output choke according to another embodiment of the present invention.

4 is a cross-sectional view showing a magnetic core and a coil of a multiple output choke according to another embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a magnetic core and a coil of a multiple output choke according to another embodiment of the present invention.

FIG. 6A is a schematic diagram showing the combination of multiple output chokes according to an embodiment of the invention.

Figure 6B is an exploded view of the multiple output choke of Figure 6A.

7 is an exploded view of a multiple output choke according to another embodiment of the present invention.

FIG. 8A is a schematic diagram showing the combination of multiple output chokes according to another embodiment of the present invention.

Figure 8B is a partial exploded view of the multiple output choke of Figure 8A.

FIG. 9A is a schematic diagram showing the combination of multiple output chokes according to another embodiment of the present invention.

Figure 9B is a partial exploded view of the multiple output choke of Figure 9A.

FIG. 10 is a schematic diagram showing the combination of multiple output chokes according to another embodiment of the present invention.

11A-11C are schematic diagrams showing the winding of a winding group according to an embodiment of the invention.

202. . . Magnetic core

204~210. . . Coil

212. . . Inner coil layer

214. . . Outer coil layer

Claims (17)

A multiple output choke device includes: a magnetic core surrounded by an inner coil layer, wherein the inner coil layer is surrounded by an outer coil layer; and a first coil having a first coil number, The first coil belongs to the inner coil layer and surrounds the magnetic core; a second coil has a second coil number and surrounds the magnetic core, wherein the first coil number and the second coil number have a first difference And a third coil having a third number of coils, the third coil belonging to the outer coil layer surrounding the magnetic core, wherein the third coil number and the second coil number have a second difference between Wherein the second coil belongs to the inner coil layer if the first difference is less than or equal to the second difference, and the second coil belongs to the outer coil if the first difference is greater than the second difference Floor. The multiple output choke as described in claim 1, wherein the self-inductance value of the first coil is greater than the self-inductance value of the third coil. The multiple output choke as described in claim 1, wherein an absolute value of at least one of the first difference and the second difference is less than 3. The multiple output choke of claim 1, wherein the inner coil layer comprises the first coil and the second coil, the inner coil layer having a first area and a second area, wherein the first An area is located between the magnetic core and the second area, the first coil is located in the first area and the second area, and the second coil is located in the second area. The multiple output choke of claim 1, wherein the inner coil layer comprises the first coil and the second coil, and the first and second coils are interleaved on the magnetic core. The multiple output choke as described in claim 1, further comprising a spool wound around the spool. The multiple output choke as described in claim 6, wherein the magnetic core further comprises: a first member having at least one first protrusion and a first fitting portion, and the first fitting portion The second protruding member has a plurality of contact surfaces, and the first protruding portion and the first engaging portion are respectively in contact with the contact surfaces. The multiple output choke of claim 7, wherein the second member has at least one second protrusion and a second fitting portion, the second fitting portion being disposed in the spool and The first fitting portion is in contact, and the contact surfaces are located at the second protruding portion and the second fitting portion. The multiple output choke as described in claim 1, further comprising a fixing member disposed on one side of the magnetic core, the fixing member comprising: a plurality of pins away from the magnetic core protrusion; and a plurality of a guiding slot is located between the pins and the magnetic core, and the wires of the first coil, the second coil and the third coil pass through the corresponding guiding slots to contact the corresponding pins. The multiple output choke as described in claim 9 further includes a frame sleeved on the fixing member. The multiple output choke as described in claim 1 of the patent application, The utility model further includes a fixing member disposed on one side of the magnetic core, the fixing member having a plurality of guiding grooves, wherein the wire ends of the first coil, the second coil and/or the third coil pass through the corresponding guiding slots And as the pin of the multiple output choke. The multiple output choke as described in claim 11, further comprising a frame sleeved on the fixing member. The multiple output choke as described in claim 1, further comprising: a housing, the magnetic core is received in the housing, and the magnetic core is a cylinder; and a fixing member is disposed on One side of the housing, the fixing member includes: a plurality of pins away from the magnetic core protrusion; and a plurality of guiding grooves located between the pins and the magnetic core, and the first coil and the second coil The wire with the third coil passes through the corresponding channel and contacts the corresponding pin. The multiple output choke as described in claim 1, further comprising a fixing member disposed on one side of the magnetic core, the fixing member having a plurality of guiding grooves, wherein the opening aperture of the at least one guiding slot is slightly smaller than the wearing The wire diameter of the coil passing through the guide groove, and the coil is inserted into the guide groove by the opening. A multiple output choke device comprising: a magnetic core comprising a cylinder; a first coil having a first number of coils; and a second coil having a second number of coils, the first number of coils and the The first coil has a first difference, wherein the absolute value of the first difference is less than a predetermined value, and the first coil and the second coil are alternately wrapped Wrap around the cylinder of the magnetic core, wherein the preset value is 3. The multi-output choke according to claim 15, further comprising a fixing member disposed on a side parallel to the extending direction of the magnetic core, the fixing member having a plurality of guiding grooves, wherein the first coil and the first coil / or the wire end of the second coil passes through the corresponding channel as the pin of the multiple output choke. The multiple output choke as described in claim 15 further comprising a fixing member disposed on a side parallel to the extending direction of the magnetic core, the fixing member having a plurality of guiding grooves and at least one opening of the guiding groove The aperture is slightly smaller than the wire diameter of the coil passing through the channel, and the coil is snapped into the channel by the opening.