Inductor and power conversion circuit

Abstract

The utility model discloses an inductor and a power conversion circuit, the inductor is inserted on a main circuit board and comprises a magnetic core body and a winding, a first magnetic column and a second magnetic column of the magnetic core body are respectively arranged between a first magnetic cover and a second magnetic cover, and the first magnetic cover, the second magnetic cover, the first magnetic column and the second magnetic column jointly form an opening. The winding is arranged on the first magnetic column through the opening, a first input end and a second input end of the winding are respectively inserted on the main circuit board, a first connecting part of the winding is connected between the first input end and the second input end, and the first connecting part is perpendicular to the main circuit board; the first connecting part, the first input end and the second input end are arranged on the first side outside the opening, the second connecting part of the winding is connected with at least two output ends inserted on the main circuit board, the second connecting part and the at least two output ends are arranged on the second side, opposite to the first side, outside the opening, and the main connecting part of the winding penetrates through the opening. And the connecting part is connected between the first connecting part and the second connecting part.

Description

Technical Field

[0001] This case relates to the field of power electronics technology, especially an inductor and a power conversion circuit. Background Art

[0002] At present, as the requirement for the power of server power supplies is getting higher and higher, the load current increases. To reduce the pulsation of the output voltage, an output filter inductor and an output capacitor are provided in the server power supply. The output filter inductor and the output capacitor together form a CLC filter to filter out the AC component in the output voltage. To meet the requirements of high power density and small volume at the same time, the design of the output filter inductor is very important.

[0003] However, the traditional output filter inductor only has a single input terminal and a single output terminal, so that the current flowing into the output filter inductor is concentrated on the single input terminal, and the current flowing out of the output filter inductor is also concentrated on the single output terminal. Therefore, the current loss at the input terminal and the output terminal of the output filter inductor is high, the current conduction path is narrow, and the loss of the current conduction path is high.

[0004] Therefore, it is necessary to develop an inductor and a power conversion circuit to solve the problems faced by the prior art. Summary of the Invention

[0005] The purpose of this case is to provide an inductor and a power conversion circuit. The winding of the inductor includes two input terminals (i.e., the first input terminal and the second input terminal) and at least two output terminals, so as to use the two input terminals and at least two output terminals to be inserted into the main circuit board to receive and transmit current respectively. Therefore, the inductor in this case has two terminals for receiving current and at least two terminals for outputting current, so as to avoid excessive concentration of current when flowing through the inductor. Therefore, the inductor in this case has low current loss, a wide current conduction path, and low loss of the current conduction path, and the overall loss of the power conversion circuit applied thereto is also low.

[0006] To achieve the above object, the present case provides an inductor inserted on a main circuit board, and the inductor includes a magnetic core body and a winding. The magnetic core body includes a first magnetic cover, a second magnetic cover, a first magnetic post and a second magnetic post. The first magnetic post and the second magnetic post are respectively disposed between the first magnetic cover and the second magnetic cover. The first magnetic cover, the second magnetic cover, the first magnetic post and the second magnetic post together form an opening. The winding is disposed on the first magnetic post through the opening, and the winding includes a first input end, a second input end, a first connection part, at least two output ends, a second connection part and a main connection part. The first input end and the second input end are respectively inserted on the main circuit board. The first connection part is connected between the first input end and the second input end. The first connection part is perpendicular to the main circuit board. The first connection part, the first input end and the second input end are disposed on a first side outside the opening. The second connection part connects at least two output ends. The at least two output ends are respectively inserted on the main circuit board. The second connection part and the at least two output ends are disposed on a second side outside the opening. The second side is opposite to the first side. The main connection part passes through the opening and is connected between the first connection part and the second connection part.

[0007] In some embodiments, the winding includes a first output end and a second output end, and the second connection part is perpendicular to the main circuit board.

[0008] In some embodiments, the winding includes a plurality of output ends, and the second connection part includes a first part perpendicular to the main circuit board and a second part parallel to the main circuit board. The first part is connected to the main connection part, and the second part includes a plurality of through holes, and each output end is adjacent to each through hole.

[0009] In some embodiments, each through hole is used to receive a capacitor, and each output end is electrically connected to one end of each capacitor.

[0010] In some embodiments, the first input end includes a plurality of first input pins respectively disposed, and the second input end includes a plurality of second input pins respectively disposed.

[0011] In some embodiments, each first input pin has at least one first through hole, and each second input pin has at least one second through hole.

[0012] In some embodiments, the first output end includes a plurality of first output pins respectively disposed, and the second output end includes a plurality of second output pins respectively disposed.

[0013] In some embodiments, each first output pin has at least one third through hole, and each second output pin has at least one fourth through hole.

[0014] In some embodiments, the first input end and the second input end are disposed opposite to each other along a first direction, and along the first direction, the maximum distance between the first input end and the second input end is greater than the length of the main connection portion.

[0015] In some embodiments, the first input end and the second input end are disposed opposite to each other along a first direction, and opposite sides of the main connection portion along the first direction are respectively connected to the first connection portion and the second connection portion through inclined surfaces.

[0016] In some embodiments, an air gap is provided on the first magnetic column.

[0017] In some embodiments, the first magnetic column includes a first sub-magnetic column and a third sub-magnetic column, the first sub-magnetic column and the third sub-magnetic column are buckled with each other, the second magnetic column includes a second sub-magnetic column and a fourth sub-magnetic column, the second sub-magnetic column and the fourth sub-magnetic column are buckled with each other, the first sub-magnetic column, the second sub-magnetic column and the first magnetic cover together form a first magnetic core, the third sub-magnetic column, the fourth sub-magnetic column and the second magnetic cover together form a second magnetic core, and the first magnetic core and the second magnetic core are buckled to form the magnetic core body.

[0018] In some embodiments, the length of the first sub-magnetic column is less than the length of the second sub-magnetic column, the length of the third sub-magnetic column is less than the length of the fourth sub-magnetic column, and the first sub-magnetic column and the third sub-magnetic column are buckled to form an air gap.

[0019] In some embodiments, the first input end, the second input end, the first connection portion, the plurality of output ends, the second connection portion and the main connection portion are of an integrally formed structure.

[0020] In some embodiments, a wind channel is formed between the first connection portion and the second connection portion along a second direction perpendicular to the first connection portion.

[0021] In some embodiments, along a third direction perpendicular to the main circuit board, a first groove is provided on a side wall of the first connection portion away from the main connection portion, a second groove is provided on a side wall of the second connection portion away from the main connection portion, and the first groove and the second groove together form a first wind channel.

[0022] In some embodiments, along a third direction perpendicular to the main circuit board, a first groove is provided on a side wall of the first connection portion away from the main connection portion, a second groove is provided on a side wall of the first portion away from the main connection portion, the first groove and the second groove together form a first wind channel, the second portion is at a distance from the main circuit board, a space is formed between the second portion and the main circuit board through the distance, and the first groove and the space together form a second wind channel.

[0023] To achieve the above object, the present case provides a power conversion circuit, which includes a primary circuit and a secondary circuit. The secondary circuit includes a rectifying unit and a filtering unit that are electrically connected in sequence. The rectifying unit includes two positive terminals and a negative terminal. The filtering unit includes a plurality of filtering capacitors connected in parallel and an inductor inserted on a main circuit board, and the inductor includes a magnetic core body and a winding. The magnetic core body includes a first magnetic cover, a second magnetic cover, a first magnetic post, and a second magnetic post. The first magnetic post and the second magnetic post are respectively disposed between the first magnetic cover and the second magnetic cover. The first magnetic cover, the second magnetic cover, the first magnetic post, and the second magnetic post together form an opening. The winding is disposed on the first magnetic post through the opening, and the winding includes a first input terminal, a second input terminal, a first connection portion, at least two output terminals, a second connection portion, and a main connection portion. The first input terminal and the second input terminal are respectively inserted on the main circuit board. The first connection portion is connected between the first input terminal and the second input terminal. The first connection portion is perpendicular to the main circuit board. The first connection portion, the first input terminal, and the second input terminal are disposed on a first side outside the opening. The second connection portion connects at least two output terminals. The at least two output terminals are respectively inserted on the main circuit board. The second connection portion and the at least two output terminals are disposed on a second side outside the opening. The second side is opposite to the first side. The main connection portion passes through the opening and is connected between the first connection portion and the second connection portion. The two positive terminals of the rectifying unit are respectively electrically connected to the first input terminal and the second input terminal. The negative terminal of the rectifying unit is electrically connected to the negative terminals of the plurality of filtering capacitors.

[0024] In some embodiments, a positive terminal of each of the plurality of filtering capacitors is respectively connected to the first input terminal and the second input terminal.

[0025] In some embodiments, the winding includes a first output terminal and a second output terminal, and the second connection portion is perpendicular to the main circuit board.

[0026] In some embodiments, the winding includes a plurality of output terminals. The second connection portion includes a first portion perpendicular to the main circuit board and a second portion parallel to the main circuit board. The first portion is connected to the main connection portion, and the second portion includes a plurality of through holes. Each output terminal is adjacent to each through hole.

[0027] In some embodiments, the power conversion circuit further includes at least one output capacitor. Each output capacitor is inserted on the main circuit board through each through hole. One end of each output capacitor is electrically connected to each output terminal. Each output terminal is electrically connected to a first main output terminal of the power conversion circuit. The other end of each output capacitor is electrically connected to a second main output terminal of the power conversion circuit.

[0028] In some embodiments, the two positive terminals are electrically connected to each other. Description of the Drawings

[0029] Figure 1Schematic diagram of the structure of the inductor in some embodiments of this case disposed on the main circuit board;

[0030] Figure 2 For Figure 1 Schematic diagram of the structure of the magnetic core body of the inductor shown;

[0031] Figure 3 For Figure 1 Schematic diagram of the structure of the winding of the inductor shown;

[0032] Figure 4 Schematic diagram of the structure of the inductor in some other embodiments of this case;

[0033] Figure 5 For Figure 4 Schematic diagram of the structure of the inductor shown from another perspective disposed on the main circuit board;

[0034] Figure 6 For Figure 4 Exploded schematic diagram of the inductor shown; and

[0035] Figure 7 For Figure 1 Or Figure 4 Equivalent circuit diagram of the power conversion circuit applied to the inductor shown.

[0036] Among them, the reference numerals are explained as follows:

[0037] 1, 1a: Inductor

[0038] 2: Main circuit board

[0039] 3: Power conversion circuit

[0040] L: Inductor

[0041] 361: First input terminal

[0042] 362: First output terminal

[0043] 363: Second input terminal

[0044] 364: Second output terminal

[0045] 32: Transformer

[0046] 32a: Primary winding

[0047] 32b: Secondary winding

[0048] 33: Secondary circuit

[0049] 34: Rectification unit

[0050] 341: First positive terminal

[0051] 342: Second positive terminal

[0052] 343: Negative terminal

[0053] SR1, SR2, SR3, SR4: Switching elements

[0054] 35: Filter unit

[0055] C11, C12: Filter capacitors

[0056] Vo1: First main output terminal

[0057] Vo2: Second main output terminal

[0058] C2: Output capacitor

[0059] 4: Magnetic core body

[0060] 41: First magnetic cover

[0061] 42: Second magnetic cover

[0062] 43: First magnetic post

[0063] 431: First sub - magnetic post

[0064] 432: Third sub - magnetic post

[0065] 44: Second magnetic post

[0066] 441: Second sub - magnetic post

[0067] 442: Fourth sub - magnetic post

[0068] 45: Opening

[0069] 451: First side

[0070] 452: Second side

[0071] 46: Air gap

[0072] 471: First groove

[0073] 472: Second groove

[0074] 5: Winding

[0075] 51: First input terminal

[0076] 511: First input pin

[0077] 512: First perforation

[0078] 52: Second input terminal

[0079] 521: Second input pin

[0080] 522: Second perforation

[0081] 53: First connection part

[0082] 54: First output terminal

[0083] 541: First output pin

[0084] 542: Third through-hole

[0085] 55: Second output terminal

[0086] 551: Second output pin

[0087] 552: Fourth through-hole

[0088] 56: Second connection part

[0089] 561: First part

[0090] 562: Second part

[0091] H: Distance

[0092] 57: Main connection part

[0093] 581: First chamfer structure

[0094] 582: Second chamfer structure

[0095] 583: Third chamfer structure

[0096] 591: Through-hole

[0097] 592: Output terminal

[0098] 6: Capacitor

[0099] X: First direction

[0100] Y: Second direction

[0101] Z: Third direction Specific embodiments

[0102] Some typical embodiments embodying the features and advantages of this case will be described in detail in the following description. It should be understood that this case can have various changes in different aspects, all of which do not depart from the scope of this case, and the descriptions and drawings therein are essentially for illustrative purposes and not for limiting this case.

[0103] Figure 1 It is a schematic structural diagram of an inductor disposed on a main circuit board for some embodiments of this case. Figure 2 It is Figure 1 a schematic structural diagram of the magnetic core body of the inductor shown in Figure 3 It is Figure 1 a schematic structural diagram of the winding of the inductor shown in Figure 4The structure of the inductor for other embodiments of this case Figure 5 is Figure 4 a schematic structural diagram of another perspective of the inductor shown, disposed on the main circuit board Figure 6 is Figure 4 a schematic exploded view of the inductor shown Figure 7 is Figure 1 or Figure 4 an equivalent circuit diagram of the power conversion circuit to which the inductor shown is applied. As Figure 1 and Figure 5 shown, the inductors 1 and 1a of this case are inserted into the main circuit board 2 and can be applied in Figure 7 the power conversion circuit 3 shown, that is, it represents Figure 1 and Figure 5 the inductors 1 and 1a shown can form the inductor L in Figure 7 the power conversion circuit 3 shown. And in the circuit structure as Figure 7 shown, the power conversion circuit 3 includes a primary circuit (not shown in the figure), a transformer 32, a secondary circuit 33, a first main output terminal Vo1, a second main output terminal Vo2, and an output capacitor C2. The transformer 32 includes a primary winding 32a and a secondary winding 32b. The primary winding 32a of the transformer 32 is electrically connected to the primary circuit. The secondary circuit 33 is electrically connected to the secondary winding 32b of the transformer 32 and includes a rectifying unit 34 and a filtering unit 35.

[0104] The rectifying unit 34 includes a first positive terminal 341, a second positive terminal 342, a negative terminal 343, and four switching elements SR1, SR2, SR3, SR4. Two switching elements SR1, SR2 are connected between the first positive terminal 341 and the negative terminal 343, and the midpoint of these two switching elements SR1, SR2 is connected to the first end of the secondary winding 32b; the other two switching elements SR4, SR3 are connected between the negative terminal 343 and the second positive terminal 342, and the midpoint of these two switching elements SR4, SR3 is connected to the second end of the secondary winding 32b. The negative terminal 343 of the rectifying unit 34 is connected to the second main output terminal Vo2.

[0105] In some embodiments of this case, as Figure 7As shown, the filtering unit 35 includes two filtering capacitors C11, C12 and an inductor L. The two filtering capacitors C11, C12 are connected in series between the switching element SR2 and the switching element SR4, where the negative terminal of the filtering capacitor C11 is connected to the switching element SR2, and the negative terminal of the filtering capacitor C12 is connected to the switching element SR4, that is, the negative terminals of both the filtering capacitor C11 and the filtering capacitor C12 are connected to the negative terminal 343 of the rectifying unit 34. The positive terminal of the filtering capacitor C11 is connected to the positive terminal of the filtering capacitor C12 and is connected to the first positive terminal 341 and the second positive terminal 342. It should be understood that in other embodiments of this case, the number of filtering capacitors can be more, for example, multiple filtering capacitors are connected in parallel to form the filtering capacitor C11 or C12.

[0106] The inductor L is connected in series with two parallel-connected filtering capacitors C11, C12. The inductor L includes a first input terminal 361 and a first output terminal 362. The first input terminal 361 of the inductor L is connected to the first positive terminal 341 of the rectifying unit 34 and the positive terminals of the two filtering capacitors C11, C12, and the first output terminal 362 of the inductor L is connected to the first main output terminal Vo'. The inductor L further includes a second input terminal 363 and a second output terminal 364. The second input terminal 363 of the inductor L is connected to the second positive terminal 342 of the rectifying unit 34 and the positive terminals of the two filtering capacitors C11, C12, and the second output terminal 364 of the inductor L is connected to the first main output terminal Vo'. The output capacitor C2 is connected between the first main output terminal Vo' and the second main output terminal Vo2, that is, one end of the output capacitor C2 is connected to the first output terminal 362 and the second output terminal 364 of the inductor L, and the other end of the output capacitor C2 is connected to the second main output terminal Vo2.

[0107] In some embodiments of this case, as Figures 1 to 3 shown, the inductor 1 is used to form Figure 7 the inductor L shown. As Figure 2 shown, the inductor 1 includes a magnetic core body 4 and a winding 5. The magnetic core body 4 includes a first magnetic cover 41, a second magnetic cover 42, a first magnetic column 43 and a second magnetic column 44. The first magnetic cover 41 and the second magnetic cover 42 are arranged oppositely, and the first magnetic column 43 and the second magnetic column 44 are arranged oppositely, where both ends of the first magnetic column 43 are respectively connected to the first magnetic cover 41 and the second magnetic cover 42, and the first magnetic column 43 is located between the first magnetic cover 41 and the second magnetic cover 42, and both ends of the second magnetic column 44 are respectively connected to the first magnetic cover 41 and the second magnetic cover 42, and the second magnetic column 44 is located between the first magnetic cover 41 and the second magnetic cover 42. As Figure 2As shown, the first magnetic cover 41, the second magnetic cover 42, the first magnetic post 43 and the second magnetic post 44 are arranged around to jointly form an opening 45, that is, the magnetic core body 4 is composed of two U-shaped magnetic cores or composed of a U-shaped magnetic core and an I-shaped magnetic core. In some embodiments of this case, taking the magnetic core body 4 being composed of two U-shaped magnetic cores as an example for illustration. Specifically, the first magnetic post 43 includes a first sub-magnetic post 431 and a third sub-magnetic post 432, and the first sub-magnetic post 431 and the third sub-magnetic post 432 are buckled with each other. The second magnetic post 44 includes a second sub-magnetic post 441 and a fourth sub-magnetic post 442, and the second sub-magnetic post 441 and the fourth sub-magnetic post 442 are buckled with each other. The first sub-magnetic post 431 of the first magnetic post 43, the second sub-magnetic post 441 of the second magnetic post 44 and the first magnetic cover 41 jointly form the first magnetic core (i.e., the first U-shaped magnetic core), and the third sub-magnetic post 432 of the first magnetic post 43, the fourth sub-magnetic post 442 of the second magnetic post 44 and the second magnetic cover 42 jointly form the second magnetic core (i.e., the second U-shaped magnetic core), wherein the first magnetic core and the second magnetic core are buckled with each other to form the magnetic core body 4. In some embodiments of this case, the length of the first sub-magnetic post 431 of the first magnetic post 43 is less than the length of the second sub-magnetic post 441 of the second magnetic post 44, and the length of the third sub-magnetic post 432 of the first magnetic post 43 is less than the length of the fourth sub-magnetic post 442 of the second magnetic post 44, wherein the first sub-magnetic post 431 of the first magnetic post 43 and the third sub-magnetic post 432 of the first magnetic post 43 are buckled with each other to form an air gap 46. In other words, there is an air gap 46 on the first magnetic post 43. It should be understood that the air gap can also be opened on the second magnetic post or the magnetic cover, as long as it is on the magnetic core body, to prevent inductance saturation. Even for magnetic cores made of some special materials, the air gap can also not be opened.

[0108] As Figure 3 shown, the winding 5 is composed of metal and includes a first input end 51, a second input end 52, a first connection part 53, a first output end 54, a second output end 55, a second connection part 56 and a main connection part 57. The first input end 51 of the winding 5 constitutes Figure 7 the first input end 361 of the inductor L and is inserted into the main circuit board 2. The second input end 52 of the winding 5 constitutes Figure 7 the second input end 363 of the inductor L and is inserted into the main circuit board 2. The first connection part 53 of the winding 5 is connected between the first input end 51 and the second input end 52, and the first connection part 53 is perpendicular to the main circuit board 2, wherein the first connection part 53, the first input end 51 and the second input end 52 are arranged on the first side 451 outside the opening 45, that is, the first side 451 of the magnetic core body 4, as Figure 1 shown. The first output end 54 of the winding 5 constitutes Figure 7 the first output end 362 of the inductor L of Figure 7The second output terminal 364 of the inductor L is inserted into the main circuit board 2. The second connecting portion 56 of the winding 5 is connected between the first output terminal 54 and the second output terminal 55. The second connecting portion 54 is perpendicular to the main circuit board 2, wherein the second connecting portion 56, the first output terminal 54 and the second output terminal 55 are disposed on the second side 452 relative to the first side 451 outside the opening 45, that is, the second side 452 of the magnetic core body 4 relative to the first side 451, as Figure 1 shown. It should be noted that due to the manufacturing process error, the first connecting portion and the second connecting portion of the actual product are not necessarily exactly 90° to the main circuit board. Therefore, the "perpendicular" described here does not only mean 90°, and a certain error is allowed. The main connecting portion 57 passes through the opening 45, so that the whole winding 5 is disposed on the first magnetic column 43 of the magnetic core body 4 through the opening 45, and the main connecting portion 57 is connected between the first connecting portion 53 and the second connecting portion 56. In some embodiments, the first connecting portion 53 is perpendicular to the main connecting portion 57, and the second connecting portion 56 is perpendicular to the main connecting portion 57. It should be noted that the perpendicular here does not mean that the joints of the first connecting portion 53, the second connecting portion 56 and the main connecting portion 57 must be right angles, as Figure 3 shown. In some embodiments of this case, the connection between the first connecting portion 53, the second connecting portion 56 and the main connecting portion 57 can be transitioned by a round chamfer to facilitate molding and prevent stress concentration. In some embodiments of this case, the first input terminal 51, the second input terminal 52, the first connecting portion 53, the first output terminal 54, the second output terminal 55, the second connecting portion 56 and the main connecting portion 57 of the winding 5 are integrally formed structures.

[0109] As can be seen from the above, the winding 5 of the inductor 1 in some embodiments of this case includes two input terminals (i.e., the first input terminal 51 and the second input terminal 52) and two output terminals (i.e., the first output terminal 54 and the second output terminal 55), so as to use the two input terminals and the two output terminals to be inserted into the main circuit board 2 to respectively receive and transmit current. Therefore, compared with the traditional output filter inductor that only includes a single input terminal and a single output terminal, the inductor 1 of this case has two terminals for receiving current and at least two terminals for outputting current to avoid the current being too concentrated when flowing through the inductor 1. Therefore, the current losses of the first input terminal 51, the second input terminal 52, the first output terminal 54 and the second output terminal 55 of the inductor 1 of this case are lower, the current guiding path is wider, and the loss of the current guiding path is lower.

[0110] Along the second direction Y perpendicular to the first connecting portion, a wind channel is formed between the first connecting portion 53 and the second connecting portion 54. Specifically, please continue to refer to Figure 1 and Figure 3, in some embodiments of the present case, the first connection portion 53 of the winding 5 is perpendicular to the main circuit board 2. In the third direction Z perpendicular to the main circuit board 2, the side wall (specifically, the middle part of the side wall) of the first connection portion 53 away from the main connection portion 57 has a first groove 471, and the second connection portion 56 is perpendicular to the main circuit board 2. In the third direction Z perpendicular to the main circuit board 2, the side wall (specifically, the middle part of the side wall) of the second connection portion 54 away from the main connection portion 57 has a second groove 472. The first groove 471 and the second groove 472 together form a first air duct, so that when the inductor 1 is inserted on the main circuit board 2, the winding 5 is prevented from blocking the air flow, and the air flow can pass through the first air duct to improve the heat dissipation capacity of the inductor 1.

[0111] And in some embodiments of the present case, as Figure 3 shown, in order to concentrate the heat during welding at the local part of the input and output pins, avoid the rapid conduction of heat during welding, and improve the welding effect, the first input end 51 includes a plurality of first input pins 511 arranged separately, such as two first input pins 511. The first input end 51 is inserted on the main circuit board 2 by using the two first input pins 511. The second input end 52 includes a plurality of second input pins 521 arranged separately, such as two second input pins 521. The second input end 52 is inserted on the main circuit board 2 by using the two second input pins 521. The first output end 54 includes a plurality of first output pins 541 arranged separately, such as two first output pins 541. The first output end 54 is inserted on the main circuit board 2 by using the two first output pins 541. The second output end 55 includes a plurality of second output pins 551 arranged separately, such as two second output pins 551. The second output end 55 is inserted on the main circuit board 2 by using the two second output pins 551. In addition, in order to further concentrate the heat during welding at the local part of the input and output pins, avoid the rapid conduction of heat during welding, and improve the welding effect, the present case also provides through holes on the input and output pins. Specifically, in this embodiment, each first input pin 511 has a corresponding first through hole 512, each second input pin 521 has a corresponding second through hole 522, each first output pin 541 includes a corresponding third through hole 542, and each second output pin 551 includes a corresponding fourth through hole 552.

[0112] In order to expand the current-carrying capacity of the inductor 1, in some embodiments, as Figure 3 shown, along the first direction X, the maximum distance between the first input end 51 and the second input end 52 of the winding 5 is greater than the length of the main connection portion 57, and the maximum distance between the first output end 54 and the second output end 55 of the winding 5 is greater than the length of the main connection portion 57. The above structure can increase the current-carrying area of the winding 5 and reduce the conduction loss at the same time.

[0113] In some embodiments, asFigure 3 As shown, the first input terminal 51 and the second input terminal 52 are oppositely arranged along the first direction X. The main connection part 57 is connected to the first connection part 53 and the second connection part 56 respectively through inclined surfaces on the relatively two sides along the first direction X, that is, a chamfer structure is formed. Specifically, in this embodiment, the winding 5 includes a first chamfer structure 581, a second chamfer structure 582, a third chamfer structure 583 and a fourth chamfer structure. The first chamfer structure 581 is located at the connection of the first connection part 53 and the main connection part 57 on one side in the first direction X. The second chamfer structure 582 is located at the connection of the first connection part 53 and the main connection part 57 on the other side in the first direction X. The third chamfer structure 583 is located at the connection of the second connection part 56 and the main connection part 57 on one side in the first direction X. The fourth chamfer structure is located at the connection of the second connection part 56 and the main connection part 57 on the other side in the first direction X. By setting the chamfer structure in the winding 5 of this case, the setting area and the setting cost of the winding 5 can be saved.

[0114] In some other embodiments of this case, as Figures 4 to 6 shown, the inductor 1a is used to form Figure 7 the inductor L shown. Compared with Figures 1 to 3 the inductor 1 in the embodiment shown, Figures 4 to 6 the winding of the inductor 1a in the embodiment shown is the same on the first side 451. The difference is that the winding on the second side 452 includes a plurality of output terminals 592, and the second connection part 56 includes a first part 561 perpendicular to the main circuit board 2 and a second part 562 parallel to the main circuit board 2, and the second part 562 includes a plurality of through holes 591. Each through hole 591 is used to receive a corresponding capacitor 6, that is, each capacitor 6 is inserted into the main circuit board 2 through the corresponding through hole 591, where the capacitor 6 constitutes Figure 7 the output capacitor C2. As Figures 4 - 6 shown, the number of the through holes 591 and the output terminals 592 corresponds one by one, and each output terminal 592 is adjacent to a through hole 591, and each output terminal 592 is electrically connected to one end of each capacitor 6. In this embodiment, the second part 562 also acts as an output busbar, improving the current-carrying capacity and avoiding the concentration of output current. In addition, similar to Figures 1 to 3 the winding 5 in the embodiment shown, Figures 4 to 6 the winding 5 in the embodiment shown can also include a first chamfer structure, a second chamfer structure, a third chamfer structure and a fourth chamfer structure, which will not be elaborated here.

[0115] And in order to expand the current-carrying capacity of the inductor 1a, in some embodiments, along the first direction X, the maximum distance between the first input terminal 51 and the second input terminal 52 of the winding 5 is greater than the length of the main connection part 57, and the length of the first part 561 of the winding 5 is greater than the length of the main connection part 57. The above structure can increase the current-carrying cross-sectional area of the winding 5 and reduce the conduction loss at the same time.

[0116] Please continue to refer to Figure 4 、 Figure 5 and Figure 6 In some embodiments of this case, in a third direction Z perpendicular to the main circuit board 2, a first groove 471 is provided on the side wall of the first connecting portion 53 away from the main connecting portion 57, and a second groove 472 is provided on the side wall of a first part 561 of the second connecting portion 56 perpendicular to the main circuit board 2 away from the main connecting portion 57. The first groove 471 and the second groove 472 together form a first air duct. In addition, a second part 562 of the second connecting portion 56 parallel to the main circuit board 2 is at a distance H from the main circuit board 2. A space is formed between the second part 562 and the main circuit board 2, and the space and the first groove 471 of the first connecting portion 53 together form a second air duct. Therefore, when the inductor 1a is inserted on the main circuit board 2, it can avoid the windings 5 blocking the air flow, so that the air flow can pass through the first air duct and the second air duct to improve the heat dissipation capacity of the inductor 1a.

[0117] In summary, the windings of the inductor in this case include two input terminals (i.e., a first input terminal and a second input terminal) and at least two output terminals, so as to use the two input terminals and at least two output terminals to be inserted on the main circuit board to respectively receive and transmit current. Therefore, the inductor in this case has two terminals for receiving current and at least two terminals for outputting current, so as to avoid the current being too concentrated when flowing through the inductor. Therefore, the current losses of the first input terminal, the second input terminal, the first output terminal and the second output terminal of the inductor in this case are relatively low, the current guiding path is relatively wide, and the loss of the current guiding path is relatively low, and the overall loss of the power conversion circuit to which it is applied is also relatively low.

Claims

1. An inductor is inserted on a main circuit board, characterized in that The inductor includes: A magnetic core body, including a first magnetic cover, a second magnetic cover, a first magnetic post, and a second magnetic post. The first magnetic post and the second magnetic post are respectively disposed between the first magnetic cover and the second magnetic cover. The first magnetic cover, the second magnetic cover, the first magnetic post, and the second magnetic post together form an opening; and A winding, disposed on the first magnetic post through the opening, and the winding includes: A first input end and a second input end, respectively inserted into the main circuit board; A first connection portion, connected between the first input end and the second input end. The first connection portion is perpendicular to the main circuit board. The first connection portion, the first input end, and the second input end are disposed on a first side outside the opening; At least two output ends, respectively inserted into the main circuit board; A second connection portion, connecting the at least two output ends. The second connection portion and the at least two output ends are disposed on a second side outside the opening, and the second side is opposite to the first side; And A main connection portion, passing through the opening and connected between the first connection portion and the second connection portion.

2. The inductor according to claim 1, characterized in that, The winding includes a first output end and a second output end, and the second connection portion is perpendicular to the main circuit board.

3. The inductor according to claim 1, characterized in that, The winding includes a plurality of output ends. The second connection portion includes a first portion perpendicular to the main circuit board and a second portion parallel to the main circuit board. The first portion is connected to the main connection portion, and the second portion includes a plurality of through holes, and each output end is adjacent to each through hole.

4. The inductor according to claim 3, wherein Each through hole is used to receive a capacitor, and each output end is electrically connected to one end of each capacitor.

5. The inductor according to claim 1, wherein The first input end includes a plurality of first input pins respectively disposed, and the second input end includes a plurality of second input pins respectively disposed.

6. The inductor according to claim 5, wherein Each of the first input pins has at least one first through hole, and each of the second input pins has at least one second through hole.

7. The inductor according to claim 2, wherein The first output end includes a plurality of first output pins respectively disposed, and the second output end includes a plurality of second output pins respectively disposed.

8. The inductor according to claim 7, wherein Each of the first output pins has at least one third through hole, and each of the second output pins has at least one fourth through hole.

9. The inductor according to claim 1, wherein The first input end and the second input end are oppositely disposed along a first direction. Along the first direction, the maximum distance between the first input end and the second input end is greater than the length of the main connection portion.

10. The inductor according to claim 1, wherein The first input end and the second input end are oppositely disposed along a first direction. The opposite two sides of the main connection portion along the first direction are respectively connected to the first connection portion and the second connection portion through inclined surfaces.

11. The inductor according to claim 1, characterized in that, There is an air gap on the first magnetic post.

12. The inductor according to claim 1, wherein The first magnetic post includes a first sub-magnetic post and a third sub-magnetic post, and the first sub-magnetic post and the third sub-magnetic post are buckled with each other. The second magnetic post includes a second sub-magnetic post and a fourth sub-magnetic post, and the second sub-magnetic post and the fourth sub-magnetic post are buckled with each other. The first sub-magnetic post, the second sub-magnetic post, and the first magnetic cover together form a first magnetic core, and the third sub-magnetic post, the fourth sub-magnetic post, and the second magnetic cover together form a second magnetic core, wherein the first magnetic core and the second magnetic core are buckled to form the magnetic core body.

13. The inductor according to claim 12, wherein The length of the first sub-magnetic column is less than that of the second sub-magnetic column, the length of the third sub-magnetic column is less than that of the fourth sub-magnetic column, and the first sub-magnetic column and the third sub-magnetic column are buckled to form an air gap.

14. The inductor according to claim 3, characterized in that, The first input terminal, the second input terminal, the first connection portion, the plurality of output terminals, the second connection portion, and the main connection portion are of an integrally formed structure.

15. The inductor according to claim 1, characterized in that, Along a second direction perpendicular to the first connection portion, an air duct is formed between the first connection portion and the second connection portion.

16. The inductor according to claim 2, wherein Along a third direction perpendicular to the main circuit board, on the side wall of the first connection portion away from the main connection portion, there is a first groove, and on the side wall of the second connection portion away from the main connection portion, there is a second groove. The first groove and the second groove together form a first air duct.

17. The inductor according to claim 3, characterized in that, Along a third direction perpendicular to the main circuit board, on the side wall of the first connection portion away from the main connection portion, there is a first groove, and on the side wall of the first portion away from the main connection portion, there is a second groove. The first groove and the second groove together form a first air duct. The second portion is at a distance from the main circuit board, and a space is formed between the second portion and the main circuit board. The first groove and the space together form a second air duct.

18. A power conversion circuit, characterized in that, Comprising: A primary circuit and a secondary circuit. The secondary circuit includes a rectifying unit and a filtering unit that are electrically connected in sequence. The rectifying unit includes two positive terminals and a negative terminal; the filtering unit includes a plurality of filtering capacitors connected in parallel and an inductor as described in claim 1. Wherein, the two positive terminals of the rectifying unit are respectively electrically connected to the first input terminal and the second input terminal of the inductor, and the negative terminal of the rectifying unit is electrically connected to a negative terminal of the plurality of filtering capacitors.

19. The power conversion circuit according to claim 18, characterized in that, A positive terminal of the plurality of filtering capacitors is respectively connected to the first input terminal and the second input terminal.

20. The power conversion circuit according to claim 18, wherein, The winding includes a first output terminal and a second output terminal, and the second connection portion is perpendicular to the main circuit board.

21. The power conversion circuit according to claim 18, wherein The winding includes a plurality of output terminals. The second connection portion includes a first portion perpendicular to the main circuit board and a second portion parallel to the main circuit board. The first portion is connected to the main connection portion, and the second portion includes a plurality of through holes, and each output terminal is adjacent to each through hole.

22. The power conversion circuit according to claim 21, wherein, The power conversion circuit further includes at least one output capacitor. Each output capacitor is inserted into the main circuit board through each through hole, and one end of each output capacitor is electrically connected to each output terminal. Each output terminal is electrically connected to a first main output terminal of the power conversion circuit, and the other end of each output capacitor is electrically connected to a second main output terminal of the power conversion circuit.

23. The power conversion circuit according to claim 18, characterized in that, The two positive terminals are electrically connected to each other.

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