JP5528513B2 - DC / DC converter - Google Patents

Description

  The present invention relates to a DC / DC converter having a transformer.

  A DC / DC converter having a transformer having a primary winding and a secondary winding that are separated from each other is usually referred to as an insulated DC / DC converter and is widely used in the industry. In this DC / DC converter, in terms of the main circuit system, a half-bridge system or a full-bridge system is generally used for the primary side main circuit, and a center tap system or a current doubler system is used for the secondary side main circuit.

  Patent Document 1 discloses that the primary side main circuit is a half-bridge type and the secondary side main circuit is a current doubler type. Based on the driving duty of the primary side switching element, the driving of the secondary side switching element is disclosed. There has been proposed a technique for optimizing the operation in the discontinuous mode by determining the timing and achieving both responsiveness and conversion efficiency.

JP 2003-111401 A

However, the use of the current doubler system in the secondary main circuit as disclosed in Patent Document 1 has the following problems.
(1) There are two smoothing reactors constituting the secondary main circuit, which is an obstacle to realizing a compact device .
(2) Since there are two smoothing reactors, the number of fixing members for fixing the two smoothing reactors, the bus bar connected to the smoothing reactor, and the screws for fixing increase, and the assembly time becomes longer.

  In addition, when the primary side main circuit is a full bridge system and the secondary side main circuit is a current doubler system, for example, when the entire main circuit is parallelized, there are two smoothing reactors, and the same problem as above Exists.

  An object of the present invention is to solve the above-mentioned problems in the conventional DC / DC converter and to provide a compact DC / DC converter.

A DC / DC converter according to the present invention includes a switching element, a primary winding, and a secondary winding, and a transformer that transmits electric power supplied to the primary winding by a switching operation of the switching element to the secondary winding. When the first and second rectifying elements for rectifying the power transmitted to the secondary winding, first and second of each smoothing the electric power rectified by the first and second rectifying elements have a smoothing reactor, wherein the first and a configured DC / DC converter to output a power that is smoothed by the second smoothing reactor, wherein the first and second smoothing reactor, wound line portion and a core portion respectively provided surrounding at least a portion of said winding portion, said first and second smoothing reactor is stacked such that the direction of extension of the axis of the winding portion of the respective are the same Arrange Characterized in that it is.

  According to the DC / DC converter according to the present invention, the smoothing reactor is constituted by the first and second smoothing reactors each including the winding portion and the core portion surrounding at least a part of the winding portion, and the first and second smoothing reactors are provided. Since the first and second smoothing reactors are arranged so as to have the same extending direction of the axis of each of the winding portions, the mounting area of the smoothing reactor can be reduced, and a compact DC / DC converter can be obtained. Can be obtained.

1 is a circuit diagram showing a main circuit configuration of a DC / DC converter according to Embodiment 1 of the present invention. FIG. It is a perspective view which shows the smoothing reactor in the DC / DC converter by Embodiment 1 of this invention. 1 is a perspective view showing a smoothing reactor structure in which two smoothing reactors are integrally fixed in a DC / DC converter according to Embodiment 1 of the present invention. It is a bottom view of the smooth reactor structure shown in FIG. It is the perspective view which looked at the smooth reactor structure shown in FIG. 3 from the back surface. In the DC / DC converter by Embodiment 2 of this invention, it is a perspective view which shows the smoothing reactor structure which fixed two smoothing reactors integrally. It is a bottom view of the smooth reactor structure shown in FIG.

Embodiment 1 FIG.
Hereinafter, a DC / DC converter including a transformer according to Embodiment 1 of the present invention (hereinafter simply referred to as a DC / DC converter) will be described with reference to the drawings. FIG. 1 is a circuit diagram showing a main circuit configuration of a DC / DC converter according to Embodiment 1 of the present invention. In FIG. 1, a DC / DC converter 100 includes a primary side main circuit 101 connected to a primary winding 41 of a transformer 4 and a secondary side main circuit 102 connected to a secondary winding 42 of the transformer 4. I have. The primary winding 41 and the secondary winding 42 of the transformer 4 are magnetically coupled via the core 43.

  The primary main circuit 101 includes a bridge circuit including a first switching element 1a, a second switching element 1b, a third switching element 1c, and a fourth switching element 1d. Each of the first to fourth switching elements 1a, 1b, 1c, and 1d is constituted by a power MOSFET. The primary winding 41 of the transformer 4 is connected to the AC side terminal of the bridge circuit via the resonant reactor 3.

  The first capacitor 2a, the second capacitor 2b, the third capacitor 2c, and the fourth capacitor 2d are connected in parallel to the first to fourth switching elements 1a, 1b, 1c, and 1d, respectively. The first to fourth switching elements 1a, 1b, 1c, and 1d corresponding to each other are protected, and soft switching of the primary main circuit 101 of the DC / DC converter 100 is realized in cooperation with the resonance reactor 3. The primary side main circuit 101 configured in this way is called a full bridge system. The DC side terminals of the bridge circuit are the input side terminals 101 a and 101 b of the DC / DC converter 100.

The secondary main circuit 102 includes a first rectifying element 5a, a second rectifying element 5b, a first smoothing reactor 6a connected in series to the first rectifying element 5a, and a second rectifying element 5b. A rectifier circuit including a second smoothing reactor 6b connected in series is provided. The first and second rectifying elements 5a and 5b are each constituted by a power MOSFET. The secondary winding 42 of the transformer 4 is connected to an AC side terminal (corresponding to terminals Fa and Fb described later) of the rectifier circuit described above.

The first and second smoothing reactors 6 a and 6 b are connected in common to the first terminals Ea and Eb, and are connected to one output side terminal 102 a of the secondary side main circuit 102. The second terminal Fa of the first smoothing reactor 6a is connected to the drain of the first rectifying element 5a. The second terminal Fb of the second smoothing reactor 6b is connected to the drain of the second rectifying element 6b. The secondary winding 42 of the transformer 4 is connected between the second terminal Fa of the first smoothing reactor 6a and the second terminal Fb of the second smoothing reactor 6b. The secondary main circuit 102 configured in this way is called a current doubler system. The DC side terminals of the rectifier circuit are 100 output side terminals 102a and 102b.

  In the DC / DC converter 100 configured as described above, the DC power input between the input side terminals 101a and 101b is supplied to the first to fourth switching elements 1a, 1b, and 1c of the primary side main circuit 101. 1d is switched at each predetermined timing to be converted into AC power and supplied to the primary winding 41 of the transformer 4. The transformer 4 to which AC power is supplied to the primary winding 41 generates AC power having a voltage corresponding to the turn ratio between the primary winding 41 and the secondary winding 42 in the secondary winding 42. The AC power generated in the secondary winding 4 is converted into predetermined DC power by switching the first and second rectifying elements 5a and 5b of the secondary main circuit 102 at predetermined timings, respectively, and output Output from the side terminals 102a and 102b as smoothed DC power.

  In the first embodiment of the present invention, as described above, the primary main circuit 101 is the full bridge system and the secondary main circuit 102 is the current doubler system. However, the present invention is not limited to this. It is also possible to adopt a system in which the entire circuit is parallelized.

  In the first embodiment, the first to fourth switching elements 1a, 1b, 1c, and 1d and the first and second rectifying elements 5a and 5b are configured by power MOSFETs. The second rectifying elements 5a and 5b may be diodes. Further, if the primary side main circuit 101 is not soft-switched, the resonance reactor 3 is unnecessary.

  FIG. 2 is a perspective view showing the structure of the smoothing reactor in the DC / DC converter according to Embodiment 1 of the present invention, and shows the structure of the first smoothing reactor 6a shown in FIG. . The second smoothing reactor 6b has the same configuration as this. In FIG. 2, the core structure 13a is a so-called EIR core, and the I-type first core 11a is in contact with the open end of the E-type second core 12a.

  The winding portion 14a is formed by winding a rectangular conductor in the edgewise direction, and is inserted into the central leg portion (not shown) of the second core 12a. The first terminal Ea of the winding portion 14a is commonly connected to the first terminal Eb (described later) of the winding portion of the second smoothing reactor 6b described above. The second terminal Fa of the winding part 14 a is connected to the drain of the first rectifying element 5 a and one end of the secondary coil 42 of the transformer 4.

  The bobbin 15a made of an insulator is inserted between the winding part 14a and the core structure 13a, and insulates between the winding part 14a and the core structure 13a and is wound around the core structure 13a. The position of the line portion 14a is restricted.

  In addition, although the above-mentioned coil | winding part 14a was described about the case where a flat conductor was wound in the edgewise direction, it is not restricted to this, For example, if it is about 2 turns, it is by press work or bending process etc. May be produced. Moreover, although the above-mentioned core structure 13a described the case where it was comprised as an EIR core, it is not restricted to this, Other core shapes, such as EE core and PQ core, may be sufficient.

  3 is a perspective view showing a smoothing reactor structure in which two smoothing reactors are integrally fixed in the DC / DC converter according to Embodiment 1 of the present invention, and FIG. 4 is a smoothing reactor structure shown in FIG. FIG. 5 is a perspective view of the smooth reactor structure shown in FIG. 3 as viewed from the back. The smoothing reactor structure 16 shown in FIGS. 3 to 5 is formed by integrating the first and second smoothing reactors 6a and 6b in FIG. 1, and the first smoothing reactor shown in FIG. 6a and the 2nd smoothing reactor 6b of the same structure as this are integrally fixed so that it may mention later.

  In the smoothing reactor structure 16 shown in FIGS. 3 to 5, the first smoothing reactor 6 a and the second smoothing reactor 6 b are respectively connected to the winding portions 14 a via a partition wall portion 183 of the terminal block 18 described later. , 14b are stacked such that the extending directions of the shaft centers thereof are the same. In the first embodiment, the respective winding portions 14a and 14b are overlapped so that the axial centers of the respective winding portions 14a and 14b coincide with each other. However, the axial centers of the respective winding portions 14a and 14b are not necessarily limited. Need not coincide with each other, and the extending directions of the axis of each of the winding portions 14a and 14b may be the same. And the 2nd core 12a of the 1st smoothing reactor 6a and the 2nd core 12b of the 2nd smoothing reactor 6b are arrange | positioned so that it may oppose via the partition part 183 of the terminal block 18 mentioned later. .

  The band-shaped fixing member 17 includes the flat surface portion 111a of the first core 11a of the first smoothing reactor 6a, both side surface portions of the first core 11a of the first smoothing reactor 6a, and the second smoothing reactor 6b. It arrange | positions along the both side surface part of the 2nd core 12b, and the both side surface part of the 1st core 11b of the 2nd smoothing reactor 6b. A pair of fixing portions 171 and 172 provided at both ends of the fixing member 17 are fixed to a housing (not shown) by screws (not shown). By fixing the pair of fixing portions 171 and 172 of the fixing member 17 to the housing with screws, the first smoothing reactor 6a and the second smoothing reactor 6b are fixed integrally.

  A terminal block 18 formed by molding resin includes a terminal connection portion 181 disposed on the front surface of the first and second smoothing reactors 6a and 6b, and the back surfaces of the first and second smoothing reactors 6a and 6b. And a partition wall portion 183 that is inserted into the facing gap between the second cores 12a and 12b of the first and second smoothing reactors 6a and 6b. The terminal connection portion 181, the wall surface portion 182, and the partition wall portion 183 are integrally connected. First to third terminal fittings (not shown) are embedded in the terminal connection portion 181 with a space between each other, and both end portions are the upper surface portion and the lower surface portion of the terminal connection portion 181 in FIG. Is exposed.

  The wall surface portion 182 of the terminal block 18 is in contact with the back surfaces of the second cores 12a and 12b of the first and second smoothing reactors 6a and 6b, so that the front and rear directions of the first and second smoothing reactors 6a and 6b are achieved. The position shift can be restricted and the position shift can be suppressed.

  In the first embodiment of the present invention, the wall surface portion 182 of the terminal block 18 is provided only on the back side of the first and second smoothing reactors 6a and 6b. You may provide another wall surface part also on the side surface side of reactor 6a, 6b. In this case, the wall surface is in contact with the side surfaces of the second cores 12a and 12b of the first and second smoothing reactors 6a and 6b, whereby the left and right directions of the first and second smoothing reactors 6a and 6b. The position shift can be restricted and the position shift can be suppressed.

  The partition wall 183 of the terminal block 18 is inserted between the second core 12a of the first smoothing reactor 6a and the second core 12b of the second smoothing reactor 6b, whereby the first and second The smooth reactors 6a and 6b are stacked in the stacking direction, that is, the position in the vertical direction is regulated.

  One end 191 of the first bus bar 19 is, as shown in FIG. 4, a first terminal fitting (not shown) embedded in the terminal connecting portion 181 together with the first terminal Eb of the second smoothing reactor 16b. And are fixed to each other and electrically connected to each other by screws (not shown). As shown in FIG. 3, the other end 192 of the first bus bar 19 is arranged so as to overlap the first terminal fitting embedded in the terminal connection portion 181 together with the first terminal Ea of the first smoothing reactor 6 a. Is done.

  As shown in FIG. 4, one end 201 of the second bus bar 20 is overlapped with a third terminal fitting (not shown) embedded in the terminal connection portion 181 together with the second terminal Fb of the second smoothing reactor 6b. Are fixed to each other and electrically connected by screws (not shown). As shown in FIG. 3, the other end 202 of the second bus bar 20 is positioned on the upper surface portion of the terminal connection portion 181 and overlaps with a second terminal fitting (not shown) embedded in the terminal connection portion 181. Be placed.

  The smoothing reactor structure 16 configured as described above is connected to the main circuit of the DC / DC converter 100 as the first and second smoothing reactors 6a and 6b shown in FIG. That is, the other end 192 of the first bus bar 19 of the smoothing reactor structure 16 configured as shown in FIGS. 3 to 5 is overlapped with the bus bar 21 connected to the output side terminal 102a shown in FIG. They are connected together by screws (not shown). More specifically, the bus bar 21 connected to the output side terminal 102a is overlaid on the upper surface of the other end 192 of the first bus bar 19 of the smoothing reactor structure 16, and the other end 192 of the first bus bar 19 A first terminal Ea of the first smoothing reactor 6a and a first terminal fitting (not shown) provided on the terminal block 181 are mechanically fixed and electrically connected together by screws. The As a result, as shown in FIG. 1, the first terminal Ea of the first smoothing reactor 6 a and the first terminal Eb of the second smoothing reactor 6 b are commonly connected, and the output side terminal is connected via the bus bar 21. 102a.

  The second terminal Fa of the first smoothing reactor 6a in the smoothing reactor structure 16 is integrated with the bus bar 22 connected to the drain of the first rectifying element 5a shown in FIG. 1 by screws (not shown). Mechanically fixed and electrically connected. The other end 202 of the second bus bar 20 of the smooth reactor structure 16 is mechanically fixed integrally to the bus bar 23 connected to the drain of the second rectifying element 5b in FIG. 1 by screws (not shown). And electrically connected together.

  As described above, in the DC / DC converter according to Embodiment 1 of the present invention, two smoothing reactors are arranged so that the axial directions of their winding portions are in the same direction. The mounting area of the smoothing reactor can be reduced, and a compact DC / DC converter can be obtained. In addition, despite the provision of two smoothing reactors, one terminal block can be provided, and an increase in the number of parts can be suppressed.

  Furthermore, since the wall surface part which can contact | abut to the core of two smoothing reactors is provided in the terminal block, position shift of two smoothing reactors can be prevented.

  Further, the first and second bus bars 19 and 20 connected to the first and second terminals Eb and Fb of the second smoothing reactor 6b located on the lower side in FIG. Since it leads out to the upper surface part of the terminal connection part 181 to be connected, the first and second terminals Eb, Fb of the second smoothing reactor 6b are connected to the first and second terminals of the first smoothing reactor 6a. Together with Ea and Fb, it is possible to connect to the main circuit from the same direction.

Embodiment 2. FIG.
In the first embodiment described above, the first and second terminals Eb and Fb of the second smoothing reactor 6b located on the lower side in FIG. 3 are placed on the upper surface of the terminal connection portion 181 in the terminal block 18. The first and second bus bars 19 and 20 are used for electrical derivation, but instead of the first and second bus bars 19 and 20, they are built in the terminal connection portion 181 of the terminal block 18. The built-in bus bar may be used. The DC / DC converter according to Embodiment 2 of the present invention uses a smoothing reactor structure having such a built-in bus bar.

  6 is a perspective view showing a smooth reactor structure in which two smoothing reactors are integrally fixed in a DC / DC converter according to Embodiment 2 of the present invention, and FIG. 7 is a view of the smooth reactor structure shown in FIG. It is a bottom view. The smooth reactor structure 16 shown in FIGS. 6 and 7 is basically the same as the smooth reactor structure 16 in the first embodiment shown in FIGS. 3 to 5, but the first embodiment in the first embodiment. Instead of the first and second bus bars 22, 23, a first built-in bus bar 26 and a second built-in bus bar 27 built in the terminal connection portion 181 of the terminal block 18 are provided.

  6 and 7, the first built-in bus bar 26 is embedded in the terminal connection portion 181 of the terminal block 18 formed by molding resin, and one end 261 of the second smoothing reactor 6b is embedded in the terminal connection portion 181. Connected to the first terminal Eb, the other end 262 is connected to the first terminal Ea of the first smoothing reactor 6a. The second built-in bus bar 27 has one end 271 connected to the second terminal Fb of the second smoothing reactor 6 b and the other end 272 exposed on the upper surface of the terminal connection portion 181 of the terminal block 18.

  In the second embodiment, the first and second built-in bus bars 26 and 27 are insert-molded inside the resin constituting the terminal block 18. In addition, the terminal block 18 may be manufactured by methods other than the manufacture by such insert molding. For example, the terminal block 18 may be provided with two through holes, and the first and second built-in bus bars 26 and 27 may be inserted into the respective through holes.

  The smoothing reactor structure 24 configured as described above is connected to 100 main circuits as the first and second smoothing reactors 6a and 6b shown in FIG. That is, the bus bar connected to the first terminal Ea of the first smoothing reactor 6a and the output-side terminal 102a shown in FIG. 1 in the smoothing reactor structure 16 configured as shown in FIGS. 21 are overlapped and mechanically and electrically connected by screws (not shown). Accordingly, the first terminal Eb of the second smoothing reactor 6b is connected to the output side terminal 102a together with the first terminal Ea of the first smoothing reactor 6a via the first internal bus 26. Is electrically connected. As a result, as shown in FIG. 1, the first terminal Ea of the first smoothing reactor 6 a and the first terminal Eb of the second smoothing reactor 6 b are commonly connected, and the output side terminal is connected via the bus bar 21. 102a.

  The second terminal Fa of the first smoothing reactor 6a in the smoothing reactor structure 16 is integrated with the bus bar 22 connected to the drain of the first rectifying element 5a shown in FIG. 1 by screws (not shown). Mechanically fixed and electrically connected. The other end 272 of the second built-in bus bar 27 of the smooth reactor structure 16 is mechanically fixed integrally to the bus bar 23 connected to the drain of the second rectifying element 5b in FIG. 1 by screws (not shown). And electrically connected. Thus, the second terminal Fb of the second smoothing reactor 6b is connected to the drain of the second rectifying element 5b via the second built-in bus bar 27 and the bus bar 23. Other configurations are the same as those in the first embodiment.

  As described above, in the DC / DC converter according to the second embodiment of the present invention, the two smoothing reactors are arranged in the same direction as the axial center of the winding portions as in the first embodiment. Thus, the mounting area of the smoothing reactor can be reduced, and a compact DC / DC converter can be obtained. In addition, despite the provision of two smoothing reactors, one terminal block can be provided, and an increase in the number of parts can be suppressed.

  Furthermore, since the wall surface part which can contact | abut to the core of two smoothing reactors is provided in the terminal block, position shift of two smoothing reactors can be prevented.

  Further, the first and second built-in bus bars 26 and 27 connected to the first and second terminals Eb and Fb of the second smoothing reactor 6b located on the lower side in FIG. In this case, the first and second terminals Eb and Fb of the second smoothing reactor 6b are connected to the first and second terminals of the first smoothing reactor 6a. It is possible to connect to the main circuit from the same direction as the terminals Ea and Fb.

  Furthermore, since the bus bar connected to the first and second terminals of the second smoothing reactor 6b located on the lower side is constituted by the first and second built-in bus bars built in the terminal block, the outer surface of the terminal block The part has a simple configuration and the assembly time can be shortened.

  The DC / DC converter according to the present invention described in the first embodiment and the second embodiment has the following characteristics.

(1) A transformer comprising a switching element, a primary winding and a secondary winding, and transmitting the power supplied to the primary winding by the switching operation of the switching element to the secondary winding; and the secondary winding A DC / DC converter having a rectifying element that rectifies power transmitted to a line and a smoothing reactor that smoothes the power rectified by the rectifying element, wherein the smoothing reactor includes a winding portion and the winding Each of the first and second smoothing reactors each including a core part surrounding at least a part of the part, and the first and second smoothing reactors have a direction in which an axis of each of the winding parts extends. It is characterized by being arranged so as to be the same.
According to the DC / DC converter configured as described above, the mounting area of the smoothing reactor can be reduced, and a compact DC / DC converter can be obtained.

(2) The DC / DC converter according to (1), further including terminal blocks for fixing terminals of the winding portions of the first and second smoothing reactors, respectively. The smoothing reactor and the terminal block are fixed integrally.
According to the DC / DC converter configured as described above, although there are two smoothing reactors, one necessary terminal block can be provided, and an increase in the number of parts can be suppressed.

(3) In the DC / DC converter according to (2), the winding portions of the first and second smoothing reactors include first and second terminals, respectively. The first and second smoothing reactors of the first and second smoothing reactors are provided with terminal connection portions juxtaposed with the first and second smoothing reactors arranged in an overlapping manner. The terminal of the smoothing reactor is fixed to one end face of the terminal connecting portion with respect to the extending direction of the axis, and the first terminal of the other smoothing reactor is fixed to the one end face of the terminal connecting portion. The second smoothing reactor is fixed to the other end face of the terminal connecting portion, and is fixed to the other opposing end face and connected to one end of the first bus bar. , One end of the second bus bar Is connected, said first and second end of each of the second bus bar, characterized in that it is arranged on the one end face of the terminal block.
According to the DC / DC converter configured as described above, the first and second smoothing reactors can be connected to the main circuit of the DC / DC converter from the same end face side of the terminal connection portion in the terminal block. .

(4) In the DC / DC converter according to (3), the first terminal of the one smoothing reactor is connected to the other end of the first bus bar. .

(5) In the DC / DC converter according to (3) or (4), the first and second bus bars are arranged on an outer surface portion of the terminal block.
According to the DC / DC converter configured as described above, the bus bar can be easily attached to the terminal block.

(6) In the DC / DC converter according to (3) or (4), the first and second bus bars are built in the terminal block.
According to the DC / DC converter configured as described above, the bus bar can be built in the terminal block in advance, and the policy of the DC / DC converter becomes easy.

(7) In the DC / DC converter according to any one of (1) to (6), the terminal block is at least a part of the respective core portions of the first and second smoothing reactors. It has the wall surface part which can contact | abut to the side surface of this.
According to the DC / DC converter configured as described above, the first and second wall surfaces of the terminal block are in contact with the side surfaces of at least a part of the respective core portions of the first and second smoothing reactors. It is possible to prevent positional deviation in a direction orthogonal to the direction in which the axis of the winding portion of the smoothing reactor 2 extends.

(8) In the DC / DC converter according to any one of (1) to (7), the terminal block is between the core portions of the first and second smoothing reactors. A partition wall to be inserted is provided.
According to the DC / DC converter thus configured, the partition wall portion of the terminal block is inserted between the respective core portions of the first and second smoothing reactors. It is possible to prevent positional deviation in the direction in which the axis of the reactor winding portion extends.

  It should be noted that within the scope of the present invention, the embodiments can be freely combined, or the embodiments can be appropriately modified or omitted.

100 DC / DC converter, 101 primary main circuit 101, 102 secondary main circuit, 4 transformer, 41 transformer primary winding, 42 transformer secondary winding, 43 transformer core, 1a first switching element 1a 1b 2nd switching element, 1c 3rd switching element, 1d 4th switching element, 3 resonant reactor, 2a 1st capacitor, 2b 2nd capacitor, 2c 3rd capacitor, 2d 4th capacitor, 101a, 101b input side terminal, 102a, 102b output side terminal, 5a first rectifying element, 5b second rectifying element, 6a first smoothing reactor, 6b second smoothing reactor, Ea, Eb first terminal, Fa, Fb 2nd terminal, 14a, 14b Winding part, 13a, 16 Core structure, 15a Bobby , 18 terminal block, 181 terminal connection portion, 182 wall surface portion, 183 partition wall portion, 17 fixing member, 171, 172 a pair of fixing portions of the fixing member, 19 first bus bar, 191, 192 one end of the first bus bar and others End, 20 Second bus bar, 201, 202 One end and the other end of the second bus bar, 26 First built-in bus bar, 261, 262 One end and the other end of the first built-in bus bar, 27 Second built-in bus bar, 271 272 One end and the other end of the first built-in bus bar.

Claims (8)

A switching element;
A transformer comprising a primary winding and a secondary winding, and transmitting power supplied to the primary winding by the switching operation of the switching element to the secondary winding;
First and second rectifying elements for rectifying the power transmitted to the secondary winding;
First and second smoothing reactors respectively smoothing the power rectified by the first and second rectifying elements,
I have a,
A DC / DC converter configured to output power smoothed by the first and second smoothing reactors ,
The first and second smoothing reactors each include a winding part and a core part surrounding at least a part of the winding part ,
The first and second smoothing reactors are arranged so that the extending directions of the axes of the respective winding portions are the same,
A DC / DC converter characterized by the above. A terminal block for fixing the terminals of the winding portions of the first and second smoothing reactors;
The first and second smoothing reactors and the terminal block are fixed integrally,
The DC / DC converter according to claim 1. The winding portions of the first and second smoothing reactors include first and second terminals, respectively.
The terminal block includes a terminal connection portion juxtaposed with the first and second smoothing reactors arranged in an overlapping manner,
The first and second terminals of one of the first and second smoothing reactors are fixed to one end surface of the terminal connection portion with respect to the direction in which the axis extends.
The first terminal of the other smoothing reactor is fixed to the other end surface facing the one end surface of the terminal connection portion, and is connected to one end of the first bus bar,
The second terminal of the other smoothing reactor is fixed to the other end face of the terminal connection portion and connected to one end of a second bus bar,
The other end of each of the first and second bus bars is disposed on the one end surface of the terminal block.
The DC / DC converter according to claim 2. The first terminal of the one smoothing reactor is connected to the other end of the first bus bar;
The DC / DC converter according to claim 3. The first and second bus bars are disposed on the outer surface of the terminal block,
The DC / DC converter according to claim 3 or 4, wherein The first and second bus bars are built in the terminal block,
The DC / DC converter according to claim 3 or 4, wherein The terminal block includes a wall surface portion that can come into contact with a side surface of at least a part of the respective core portions of the first and second smoothing reactors.
The DC / DC converter according to any one of claims 2 to 6, wherein the DC / DC converter is characterized in that The terminal block includes a partition wall portion inserted between the core portions of the first and second smoothing reactors,
The DC / DC converter according to any one of claims 2 to 7, wherein the DC / DC converter is characterized in that

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