TRANSFORMER DEVICE

Abstract

Transformer device (1) comprising: a transformer (10) including a primary winding (11a) formed by winding a first conductor (11f) and provided in an insulation plate (11b), and a secondary winding (12a) opposite to the primary winding (11a) and formed by winding a second conductor (12e), a first wire (21) connected to the primary winding (11a) and drawn out to one side, a second wire (22) connected to the secondary winding (12a), a base material (30), a primary circuit (41) provided on the base material (30) and connected to the primary winding (11a) via the first wire (21), and a secondary circuit (42) provided on the base material (30) and connected to the secondary winding (12a) via the second wire (22), wherein the primary circuit (41) and the secondary circuit (42) are arranged side by side, where the second wire (22) is pulled out to the same side as the first wire (21), the base material (30) is provided on the side from which the first wire (21) and the second wire (22) are drawn out, the primary circuit (41) and the secondary circuit (42) are arranged along a crossing direction crossing a drawing direction in which the first wire (21) and the second wire (22) are drawn out, wherein the primary winding (11a) contains a leakage inductor (11h, 11s) which does not contribute to the transformation, and wherein the leakage inductor (11h, 11s) is provided in the insulation plate (11b) and is provided on the primary circuit (41) side in the crossing direction.

Description

[0001] The present invention relates to a transformer device.

[0002] Transformer devices that convert voltage are known. For example, a transformer device includes a transformer with a primary winding and a secondary winding, a primary circuit connected to the primary winding via a first wire, and a secondary circuit connected to the secondary winding via a second wire (see, for example, Patent Literature 1).

[0003] Patent Literature 1: Japanese Patent Application Laid-Open No. JP 2003-272929 A.

[0004] WO 2015 125 527 A1 relates to a DC-DC converter with a transformer device in which two stacked inductors are each connected to corresponding control circuits.

[0005] US 2012 / 0 161 696 A1 relates to a device for inductive power transmission in which, in order to increase the degree of coupling between two inductors, an annular coil is arranged coaxially around a transmitter winding.

[0006] Depending on the arrangement of the first and second wires and the primary and secondary circuits, the conventional transformer device may cause structural waste, and there is a need for further improvement in this regard.

[0007] The present invention addresses this problem, and an object of the invention is to provide a transformer device that can suppress structural waste.

[0008] The invention is defined by the independent claim. The dependent claims describe advantageous embodiments.

[0006] To solve the above-mentioned problem and achieve the object, a transformer device according to the present invention comprises a transformer including a primary winding formed, among other things, by winding a first conductor, and a secondary winding opposite to the primary winding and formed by winding a second conductor; a first wire connected to the primary winding and drawn out to one side; a second wire connected to the secondary winding and drawn out to the same side as the first wire; and a base material provided on the side from which the first wire and the second wire are drawn out.

[0009] The transformer device includes a primary circuit provided on the base material and connected to the primary winding via the first wire; and a secondary circuit provided on the base material and connected to the secondary winding via the second wire, wherein the primary circuit and the secondary circuit are provided side by side along a crossing direction crossing the drawing direction in which the first wire and the second wire are drawn out.

[0010] Furthermore, in the transformer device, the primary winding comprises a leakage inductor which, among other things, does not contribute to the transformation, the leakage inductor being provided on the side of the primary circuit in the crossing direction.

[0011] Furthermore, in the transformer device, preferably, the primary winding is formed by winding a flat, plate-like and linear first conductor around both axis lines of a coil axis line and a leakage inductor axis line located more toward the primary circuit side in the crossing direction than the coil axis line, the secondary winding is formed by winding a flat, plate-like and linear second conductor around the coil axis line, and the primary winding and the secondary winding are stacked along a coil axis direction, which is a direction along the coil axis line.

[0012] Furthermore, the transformer device preferably comprises a magnetic member on which the primary winding and the secondary winding are provided and which contains a magnetic material, wherein the magnetic member comprises a wall part which is provided annularly around the coil axis line and surrounds the outer peripheries of the primary winding and the secondary winding, wherein the wall part includes an opening which opens on the side of the primary winding and the secondary winding, whose opening angle centered on the coil axis line is 120° to 180° and which exposes the leakage inductor and terminals of the secondary winding.

[0013] The transformer device according to the invention includes a primary winding, a secondary winding, a first wire connected to the primary winding and drawn out to one side, and a second wire connected to the second winding and drawn out to the same side as the first wire. Accordingly, in the transformer device, the first wire connected to the primary winding and the second wire connected to the secondary winding are drawn out to one side, so that, compared to a case where a transformer is provided in a cutout part where a part of a base material is cut out and where wires are drawn out to both sides of the transformer, the cutout part can be omitted and waste of base material can be suppressed. In this way, the transformer device can suppress structural waste. Brief description of the drawings Fig. 1 is a perspective view showing a configuration example of a transformer device according to an embodiment. Fig. 2 is an exploded perspective view showing a configuration example of the transformer device in the embodiment. Fig. 3 is a perspective view showing a configuration example of a surface side of a primary winding in the embodiment. Fig. 4 is a perspective view showing a configuration example of a back surface side of the primary winding in the embodiment. Fig. 5 is a perspective view showing a configuration example of a secondary winding in the embodiment. Fig. 6 is a perspective view showing a configuration example of a ferrite in the embodiment. Fig. 7 is a schematic view showing a configuration example of the transformer device in the embodiment. Fig. 8 is a schematic view showing a configuration example of a transformer device according to a comparative example. Description of an embodiment

[0014] With reference to the accompanying drawings, an embodiment implementing the present invention (an exemplary embodiment) will be described in detail below. The present invention is not limited to the content of the following embodiment. The components described below can be replaced with other corresponding components by those skilled in the art. The configurations described below can be combined as appropriate. Embodiment

[0015] The following describes a transformer device 1 according to an embodiment. The transformer device 1 is a device that converts a voltage. The transformer device 1 is a thin transformer device for a DC-DC converter, which, for example, steps down the voltage and outputs a large current. The transformer device 1 comprises, as shown in Fig. 1 and Fig. 2 shows a transformer 10, first and second wires 21 and 22, a base material 30 and a circuit unit 40 with a primary circuit 41, a secondary circuit 42 and a control circuit 43.

[0016] The coil axis direction is a direction along a coil axis line X. The axis crossing direction is a direction that crosses the coil axis direction and is usually a direction orthogonal to the coil axis direction. The arrangement direction is a direction in which the transformer 10 and the circuit unit 40 are arranged. The arrangement crossing direction is a direction that crosses the arrangement direction and is usually a direction orthogonal to the arrangement direction.

[0017] The transformer 10 is an electrical transformer that converts a voltage. The transformer 10 comprises a primary winding part 11, a secondary winding part 12, a coil former 13, and a ferrite 14. The primary winding part 11 comprises, as shown in Fig. 3 and Fig. 4 shows a primary winding 11a, an insulating plate-like insulation plate 11b, and cooling passages 11c. The insulation plate 11b is a four-layer substrate consisting of first to fourth layers. In the insulation plate 11b, the first layer and the fourth layer are surface layers, and the second layer and the third layer are inner layers.

[0018] The primary winding 11a includes a front-side primary winding 11d provided on the surface of the first layer of the insulation plate 11b, a back-side primary winding 11e provided on the back surface of the fourth layer of the insulation plate 11b, and inner-layer primary windings (not shown) provided on corresponding mounting surfaces of the second layer and the third layer of the insulation plate 11b. The front-side primary winding 11d is a coil formed by spirally winding a flat, plate-like, and linear first conductor 11f around the coil axis line X and a leakage inductor axis line X1 along the crossing direction. That is, the front-side primary winding 11d is a non-circular spiral coil formed such that the first conductor 11c encircles both axis lines of the coil axis line X and the leakage inductor axis line X1.The front primary winding 11d may be formed as a conductor pattern on the surface of the insulation plate 11b, for example, by etching, or may be formed as a conductor pattern on the surface of the insulation plate 11b, for example, by etching. a conductor pattern formed by punching a conductive plate on the surface of the insulation plate 11b. The leakage inductor axis line X1 extends in the same direction as the coil axis line X, which is the axis line on the primary circuit 41 side in the arrangement crossing direction with respect to the coil axis line X.

[0019] The front-side primary winding 11d includes a coil winding part 11g that contributes to the transformation, a leakage inductor 11h that does not contribute to the transformation, a winding start end 11i that is an end part on the winding start side, and a winding end part 11j that is an end part on the winding end side. The coil winding part 11g is a part provided around the coil axis line X. The coil winding part 11g is, viewed from the coil axis direction, a part that overlaps with a secondary winding 12a described later and is circular. The leakage inductor 11h is an inductor for resonance and is a part provided around the leakage inductor axis line X1. The leakage inductor 11h is, viewed from the coil axis direction, a part that does not overlap with the secondary winding 12a and is formed in a non-circular shape.The leakage inductor 11h is provided on the primary circuit 41 side in the arrangement cross direction (cross direction). That is, the leakage inductor 11h is provided so as to protrude toward the primary circuit 41 side from the coil winding part 11g along the arrangement cross direction. In the front-side primary winding 11d, the first conductor 11f is wound along the axis cross direction from inside to outside of the front-side primary winding 11d, for example, the winding start end 11i is arranged on the outer peripheral side of the front-side primary winding 11d and the winding end part 11j is arranged on the inner peripheral side of the front-side primary winding 11d. The winding start end 11i forms a terminal 11k and is arranged on the primary circuit 41 side in the arrangement direction.

[0020] The rear primary winding 11e has the same shape as the front primary winding 11d and is stacked on the front primary winding 11d along the coil axis direction with the insulation plate 11b interposed therebetween. The rear primary winding 11e is a coil formed by spirally winding a flat, plate-like, and linear first conductor 11f around the coil axis line X and the leakage inductor line X1 along the axis crossing direction. That is, the rear primary winding 11e is a non-circular spiral coil formed such that the first conductor 11f encircles both the coil axis line X and the leakage inductor axis line X1.The rear primary winding 11e may, for example, be formed as a conductor pattern on the rear surface of the insulation plate 11b by etching or may be provided with a conductor pattern formed by punching a conductive plate on the rear surface of the insulation plate 11b.

[0021] The back-side primary winding 11e includes a coil winding part 11r that contributes to the transformation, a leakage inductor 11s that does not contribute to the transformation, a winding start end 11t that is an end part on the winding start side, and a winding end part 11u that is an end part on the winding end side. The coil winding part 11r is a part provided around the coil axis line X. The coil winding part 11r is, viewed from the coil axis direction, a part that overlaps with the secondary winding 12a and is formed in a circular shape. The leakage inductor 11s is a part provided around the leakage inductor axis line X1. The leakage inductor 11s is, viewed from the coil axis direction, a part that does not overlap with the secondary winding 12a and is formed in a non-circular shape.The leakage inductor 11s is provided on the primary circuit 41 side in the arrangement cross direction (cross direction). That is, the leakage inductor 11s is provided so as to protrude toward the primary circuit 41 side from the coil winding part 11r along the arrangement cross direction. In the back primary winding 11e, the first conductor 11f is wound along the axis cross direction from inside to outside of the back primary winding 11e, for example, the winding start end 11t is arranged on the inner peripheral side of the back primary winding 11e and the winding end part 11u is arranged on the outer peripheral side of the back primary winding 11e. The winding end part 11u forms a terminal 11v and is arranged on the primary circuit 41 side in the arrangement direction.In the insulation board (four-layer substrate) 11b, the inner layers and the surface layers are electrically connected through through holes 11m, and two layers of the inner layers are electrically connected via the cooling passages 11c. That is, in the insulation board 11b, the front-side primary winding 11d of the first layer and the inner-layer primary winding of the second layer are electrically connected via the through holes 11m, the inner-layer primary winding of the second layer and the inner-layer primary winding of the third layer are electrically connected via the cooling passages 11c, and the inner-layer primary winding of the third layer and the rear-side primary winding 11e of the fourth layer are electrically connected via the through holes 11m.As a result, when an alternating voltage is applied to the terminal 11k of the front primary winding 11d and the terminal 11v of the rear primary winding 11e, a current flows through the primary winding 11a.

[0022] The cooling passages 11c cool the primary winding part 11. In the cooling passages 11c, for example, in a state where a metal plate 11n is provided on the insulation plate 11b, a plurality of through holes 11p extending through the metal plate 11n and the insulation plate 11b along the coil axis direction are provided.

[0023] The secondary winding part 12 comprises as in Fig. 5 shows the secondary winding 12a and a heat sink 12b. The secondary winding 12a faces the primary winding 11a. The secondary winding 12a is configured with a smaller number of coil turns than the primary winding 11a. The secondary winding 12a is, for example, a two-turn (two-roll) coil and includes an upper secondary winding 12c and a lower secondary winding 12d stacked on the upper secondary winding 12c in the coil axis direction. The upper secondary winding 12c is an annular member formed by winding a flat, plate-like and linear second conductor 12e with one turn around the coil axis line X along the axis crossing direction. That is, the upper secondary winding 12c is an annular member formed such that the second conductor 12e encircles the coil axis line X.The upper secondary winding 12c may be formed, for example, by punching a conductive plate or by winding an elongated plate-like member.

[0024] The upper secondary winding 12c includes a coil winding part 12f that contributes to the transformation, a winding start end 12g that is an end part on the winding start side, and a winding end part 12h that is an end part on the winding end side. The coil winding part 12f is a part provided around the coil axis line X. The coil winding part 12f is, as viewed from the coil axis direction, a part that overlaps with the coil winding part 11g of the primary winding 11a and is formed in a circular shape. In the upper secondary winding 12c, the winding start end 12g forms a terminal 12i that is arranged on the secondary circuit 42 side in the arrangement direction. The upper secondary winding 12c further forms a coupling part 12j at which the winding end part 12h is coupled to the lower secondary winding 12d and which is arranged on the side of the secondary circuit 42 in the arrangement direction.

[0025] The lower secondary winding 12d has the same shape as the upper secondary winding 12c and is stacked on the upper secondary winding 12c along the coil axis direction with the primary winding part 11 therebetween. The lower secondary winding 12d and the upper secondary winding 12c are insulated from the primary winding part 11. For example, a laminated upper insulation layer 12k is provided between the upper secondary winding 12c and the primary winding part 11, which insulates the upper secondary winding 12c and the primary winding part 11 (see Fig. 2). Accordingly, a layered lower insulation layer 12m is provided between the lower secondary winding 12d and the primary winding portion 11, which insulates the lower secondary winding 12d and the primary winding portion 11. The lower secondary winding 12d is an annular member formed by winding the flat, plate-like, and linear second conductor 12e one turn around the coil axis line X along the axis crossing direction. That is, the lower secondary winding 12d is an annular member formed such that the second conductor 12e encircles the coil axis line X. The lower secondary winding 12d can be formed, for example, by stamping a conductive plate or by winding an elongated plate-like member.

[0026] The lower secondary winding 12d includes a coil winding part 12n that contributes to the transformation, a winding start end 12p that is an end part on the winding start side, and a winding end part 12q that is an end part on the winding end side. The coil winding part 12n is a part provided around the coil axis line X. The coil winding part 12n is, as viewed from the coil axis direction, a part that overlaps with the coil winding part 11g of the primary winding 11a and is formed in a circular shape. The lower secondary winding 12d forms the coupling part 12j, at which the winding start end 12p is coupled to the upper secondary winding 12c, and which is arranged on the secondary circuit 42 side in the arrangement direction. In the lower secondary winding 12d, the winding end part 12q forms a terminal 12r arranged on the secondary circuit 42 side in the arrangement direction.

[0027] The heat sink 12b includes an upper heat sink 12s provided at the coil winding part 12f of the upper secondary winding 12c, and a lower heat sink 12t provided at the coil winding part 12n of the lower secondary winding 12d. The upper heat sink 12s is formed in a plate-like shape and extends along the arrangement crossing direction from one end of the coil winding part 12f of the upper secondary winding 12c. The upper heat sink 12s dissipates heat generated at the coil winding part 12f of the upper secondary winding 12c. The lower heat sink 12t is formed in a plate-like shape and extends along the arrangement crossing direction from one end of the coil winding part 12n of the lower secondary winding 12d. The lower heat sink 12t dissipates heat generated at the coil winding part 12n of the lower secondary winding 12d.

[0028] The Fig. The coil former 13 shown in FIG. 2 is a member that covers the coil winding portions 12f and 12n of the secondary winding 12a. The coil former 13 includes an upper coil former 13a that covers the coil winding portion 12f of the upper secondary winding 12c, and a lower coil former 13e that covers the coil winding portion 12n of the lower secondary winding 12d. The upper coil former 13a includes an annular and plate-like ring member 13b extending in the axis-crossing direction, a cylindrical tubular portion 13c extending in the coil axis direction from the inside of the ring member 13b, and a protruding portion 13d protruding on the upper secondary winding 12c side of the ring member 13b. The ring member 13b covers the coil winding portion 12f of the upper secondary winding 12c, viewed from the coil axis direction. The tubular portion 13c is inserted into the inner surface of the upper secondary winding 12c.The protruding portion 13d is fitted between an end portion on one side of the upper secondary winding 12c in the circumferential direction and an end portion on the other side. As a result, the upper coil former 13a is fixed to the coil winding portion 12f of the upper secondary winding 12c in a state where the coil winding portion 12f of the upper secondary winding 12c is covered by the coil axis direction.

[0029] The lower coil former 13e has the same configuration as the upper coil former 13a and includes an annular and plate-like ring member 13f extending in the axis-crossing direction, a cylindrical tubular member 13g extending in the coil axis direction from the inside of the ring member 13f, and a protruding portion 13h protruding on the lower secondary winding 12d side of the ring member 13f. The ring member 13f covers the coil winding portion 12n of the lower secondary winding 12d, as viewed from the coil axis direction. The tubular portion 13g is inserted into the inside of the lower secondary winding 12d. The protruding portion 13h is fitted between an end portion on one side of the lower secondary winding 12d in the circumferential direction and an end portion on the other side.As a result, the lower coil body 13e is fixed to the coil body 12n of the lower secondary winding 12d in a state where the coil winding part 12n of the lower secondary winding 12d is covered by the coil axis direction.

[0030] The Fig. The ferrite 14 shown in Figure 2 is a magnetic member that transmits the magnetic force (magnetic flux) generated by the primary winding 11a and the secondary winding 12a and suppresses loss of the magnetic force. The ferrite 14 is a member containing a magnetic material, and is, for example, a composite oxide of an iron oxide and a metal. The ferrite 14 is provided with the primary winding 11a and the secondary winding 12a and includes an upper ferrite 14a provided on the side of the upper secondary winding 12c and a lower ferrite 14b provided on the side of the lower secondary winding 12d. The upper ferrite 14a includes, as shown in Fig. 6, a fan-shaped and plate-like surface part 14c provided in the axis crossing direction, a columnar magnetic core 14d extending along the coil axis direction from the center of the surface part 14c on the primary winding 11a and the secondary winding 12a side and inserted into the inside of the primary winding 11a and the secondary winding 12a, and a wall part 14e provided annularly around the coil axis line X and surrounding the outer peripheries of the primary winding 11a and the secondary winding 12a. The wall part 14e includes an opening 14f opening on the side of the primary circuit 41 and the secondary circuit 42 described below. The primary winding 11a and the secondary winding 12a are wound on the magnetic core 14d.The opening angle θ of the opening 14f centered on the coil axis line X is, for example, 120° to 180°, and the leakage inductors 11h and 11s, the terminals 12i and 12r, and the coupling part 12j of the secondary winding 12a are exposed at the opening 14f. The opening angle θ of the opening 14f is set in accordance with the size of the primary winding 11a and the secondary winding 12a. When the opening angle θ of the opening 14f is relatively smaller, leakage of the magnetic force (magnetic flux) is reduced and noise is reduced. In particular, when the opening angle θ of the opening 14f is larger than 180°, the leakage of the magnetic force is greater and noise is louder. As just described, the opening angle θ of the opening 14f is preferably set small. However, because the thickness of the second conductor 12e of the secondary winding 12a is determined by the current and the like, the opening angle θ in this situation is set to 120° to 180°.

[0031] The lower ferrite 14b is a fan-shaped and plate-like member extending along the axis crossing direction. The lower ferrite 14b is combined with the upper ferrite 14a in the coil axis direction. The ferrite 14 encloses the primary winding 11a and the secondary winding 12a with the upper ferrite 14a and the lower ferrite 14b along the coil axis direction. In the transformer device 1, the respective members are fixed by inserting and tightening a plurality of screws 51 to 53 into holes 12u of the upper secondary winding 12c, holes 12v of the upper insulation layer 12k, holes 11w of the primary winding part 11, holes 12w of the lower insulation layer 12m, and holes 12x of the lower secondary winding 12d.

[0032] First wires 21 (21a, 21b) are connected to the primary winding 11a and extended to one side in the arrangement direction. For example, in the first wire 21a, one end is connected to the terminal 11k of the front-side primary winding 11d, and the other end is connected to the primary circuit 41. Furthermore, in the first wire 21b, one end is connected to the terminal 11v of the rear-side primary winding 11e, and the other end is connected to the primary circuit 41.

[0033] Second wires 22 (22a to 22c) are connected to the secondary winding 12a and are drawn out to the same side as the first wires 21. For example, in the second wire 22a, one end is connected to the terminal 12i of the upper secondary winding 12c, and the other end is connected to the secondary circuit 42. Furthermore, in the second wire 22b, one end is connected to the terminal 12r of the lower secondary winding 12d, and the other end is connected to the secondary circuit 42. In the second wire 22c, one end is connected to the coupling part (center tap) 12j of the upper secondary winding 12c and the lower secondary winding 12d, and the other end is connected to the secondary circuit 42.

[0034] The base material 30 is an insulating plate-like member and is provided on the side from which the first wires 21 and the second wires 22 are drawn. The base material 20 is arranged side by side on one side of the transformer 10 along the arrangement direction. The base material 30 is formed, for example, in a rectangular shape. For example, in the base material 30, the short sides extend along the arrangement direction, and the long sides extend along the arrangement crossing direction.

[0035] The primary circuit 41 is, for example, a switching circuit including a plurality of switching elements and is provided on the base material 30. The primary circuit 41 is arranged on the base material 30 so as to face the terminals 11k and 11v of the primary winding 11a in the arrangement direction. The primary circuit 41 is connected to a DC power source (not shown) and the primary winding 11a, converts DC power output from the DC power source to AC power, and outputs the converted AC power to the primary winding 11a. The primary circuit 41 is arranged on the base material 30 side adjacent to the secondary circuit 42 along the arrangement crossing direction.

[0036] The secondary circuit 42 is, for example, a synchronous rectification and smoothing circuit including a plurality of switching elements, and is provided on the base material 30. The secondary circuit 42 is arranged on the base material 30 so as to face the terminals 12i and 12r and the coupling part (center tap) 12j of the secondary winding 12a in the arrangement direction. The secondary circuit 42 is connected to the secondary winding 12a and a load (not shown), rectifies an AC power output from the secondary winding 12a, smoothes the rectified AC power, and outputs it to the load. As mentioned above, the primary circuit 41 and the secondary circuit 42 are mounted on the base material 30 side by side along the arrangement crossing direction.

[0037] The control circuit 43 is a circuit that controls the primary circuit 41 and the secondary circuit 42. The control circuit 43 is connected to the primary circuit 41 and performs, for example, on / off control of the switching elements of the switching circuit. Furthermore, the control circuit 43 is connected to the secondary circuit 42 and performs, for example, on / off control of the switching elements of the synchronous rectifier circuit.

[0038] The following describes an operation example of the transformer device 1. The transformer device 1 outputs DC power from the DC power source to the primary circuit 41, converts the DC power to AC power by the primary circuit 41, and outputs the AC power to the primary winding 11a. Then, the transformer device 1 supplies AC power stepped down on the secondary side by the electromagnetic induction, etc., of the primary winding 11a and the secondary winding 12a, rectifies the AC power, smooths the rectified AC power, and supplies it to the load.

[0039] In the following, the transformer device 1 of the embodiment and a transformer device 100 according to a comparative example are compared. In the transformer device 100 of the comparative example, as shown in Fig. 8, a base material 100 is formed in a U-shape and includes a cutout portion 111 where the base material 110 is cut out. In the transformer device 100, a transformer 120 is disposed in the cutout portion 111 of the base material 110, and, enclosing the transformer 120, a primary circuit 131 is disposed on one side of the base material 110 and a secondary circuit 132 is disposed on the other side of the base material 110. Furthermore, in the transformer device 100, a primary winding 121 and the primary circuit 131 are connected via a first wire 141, and a secondary winding 122 and the secondary circuit 132 are connected via a second wire 142.In the transformer device 100, the first wire 141 is extended to one side of the transformer 120 along the array crossing direction, and the second wire 142 is extended to the other side of the transformer 120 along the array crossing direction. The primary circuit 131 and the secondary circuit 132 are connected to a control circuit 133.

[0040] Furthermore, the transformer device 1 in this embodiment comprises as in Fig.7 etc., the transformer 10 is shown including the primary winding 11a formed by winding the first conductor 11f, and the secondary winding 12a opposite to the primary winding 11a and formed by winding the second conductor 12e, the first wires 21 connected to the primary winding 11a and drawn out to one side, the second wires 22 connected to the secondary winding 12a and drawn out to the same side as the first wires 21, the base material 30 provided on the side from which the first wires 21 and the second wires 22 are drawn out, the primary circuit 41 provided on the base material 30 and connected to the primary winding 11a via the first wires 21, and the secondary circuit 42 provided on the base material 30 and connected to the secondary winding 12a via the second wires 22 is connected.As just described, in the transformer device 1 of the embodiment, since the first wires 21 connected to the primary winding 11a and the second wires 22 connected to the secondary winding 12a are drawn out to the same side, compared with the case where the transformer 120 is disposed in the cutout portion 111 where a part of the base material 110 is cut out, as in the transformer device 100 in the comparative example, and the first and second wires 141 and 142 are drawn out to both sides of the transformer 120, the cutout portion 111 can be omitted and waste of the base material 112 can be suppressed. Thus, the transformer device 1 of the embodiment can suppress structural waste and thereby reduce manufacturing costs.Furthermore, in the transformer device 1, no processing is required for the cutout part 111, thereby simplifying the processing of the base material 30. Furthermore, the transformer device 1 can reduce the free space where no circuit is formed on the base material 30 compared to the transformer device 100 in the comparative example, thereby suppressing the increase in size.

[0041] Furthermore, in the transformer device 1, the primary circuit 41 and the secondary circuit 42 are arranged side by side along the arrangement crossing direction crossing the drawing direction (arrangement direction) in which the first wires 21 and the second wires 22 are drawn out. As a result, in the transformer device 1, the primary circuit 41 can be arranged opposite the primary winding 11a, and the secondary circuit 42 can be arranged opposite the secondary winding 12a. Accordingly, the transformer device 1 can relatively shorten the lengths of the first wires 21 and the second wires 22.

[0042] Furthermore, in the transformer device 1, the primary winding 11a includes the leakage inductors 11h and 11s that do not contribute to the transformation, and the leakage inductors 11h and 11s are provided on the primary circuit 41 side in the cross direction. As a result, in the transformer device 1, the leakage inductors 11h and 11s can also serve as part of the portion connecting the coil winding parts 11g and 11r and the terminals 11k and 11v, thereby simplifying the circuit structure. Furthermore, because the transformer device 1 uses the leakage inductors 11h and 11s, software switching can be accomplished by the primary circuit 41, thereby improving the switching efficiency.Leakage inductors 11h and 11s can be provided in an area E where primary winding 11a is connected to primary winding 41, so that leakage inductors 11h and 11s can effectively utilize the area E and no dead space is created. Compared with a case where resonant inductors are provided instead of leakage inductors 11h and 11s, the transformer device 1 can suppress enlargement. For example, if resonant inductors are provided to isolate the transformer inductor and the resonant inductors, a certain distance must be left, which may result in enlargement.

[0043] Furthermore, in the transformer device 1, the primary winding 11a is formed by winding the flat, plate-like, and linear first conductor 11f around both axis lines of the coil axis line X and the leakage inductor axis line X1, which is located more toward the primary circuit 41 side in the arrangement crossing direction than the coil axis line X, the secondary winding 12a is formed by winding the flat, plate-like, and linear second conductor 12e around the coil axis line X, and the primary winding 11a and the secondary winding 12a are stacked along the coil axis direction corresponding to the direction along the coil axis line X. Therefore, the transformer device 1 can configure the thin transformer 10 with the leakage inductors 11h and 11s included therein.

[0044] Furthermore, in the transformer device 1, the ferrite 14, on which the primary winding 11a and the secondary winding 12a are provided and which contains the magnetic material, is provided. The ferrite 14 includes the wall part 14e provided annularly around the coil axis line X and surrounding the outer peripheries of the primary winding 11a and the secondary winding 12a. The wall part 14e includes the opening 14f opening to the primary circuit 41 and secondary circuit 42 sides, whose opening angle θ centered on the coil axis line X is 120° to 180°, and exposing the leakage inductors 11h and 11s, the terminals 12i and 12r, and the coupling part (center tap) 12j of the secondary winding 12a.As a result, the transformer device 1 can keep the opening angle θ of the opening 14f small while still exposing the leakage inductors 11h and 11s, the terminals 12i and 12r, and the coupling part (center tap) 12j of the secondary winding 12a. Accordingly, the transformer device 1 can suppress leakage of the magnetic force of the primary winding 11a and the secondary winding 12a and reduce noise. Modifications

[0045] Modifications of the embodiment will be described below. For the transformer device 1, the transformer 10 in which the thin primary winding 11a and the secondary winding 12a are stacked was described, but the invention is not limited thereto. The transformer device 1 may, for example, be a transformer in which a spiral winding and a secondary winding are opposed to each other.

[0046] Furthermore, the transformer device 1 can be provided with a magnetic core for leakage along the leakage inductor axis line X1. In this case, the primary winding 11a is formed such that the first conductor 11f encircles both magnetic cores, namely the magnetic core 14d along the coil axis line X and the magnetic core for leakage along the leakage inductor axis line X1. List of reference symbols 1 transformer device 10 Transformer 11a primary winding 11f first leader 11h, 11s leakage inductor 12e second conductor 12a secondary winding 14 Magnetic element (ferrite) 14th wall section 14f opening 21 first wire 22 second wire 30 basic materials 41 primary circuit 42 secondary circuit X coil axis line X1 Leakage inductor axis line θ opening angle

Claims

[1] Transformer device (1) comprising: a transformer (10) including a primary winding (11a) formed by winding a first conductor (11f) and provided in an insulation plate (11b), and a secondary winding (12a) opposite to the primary winding (11a) and formed by winding a second conductor (12e), a first wire (21) connected to the primary winding (11a) and drawn out to one side, a second wire (22) connected to the secondary winding (12a), a base material (30), a primary circuit (41) provided on the base material (30) and connected to the primary winding (11a) via the first wire (21), and a secondary circuit (42) provided on the base material (30) and connected to the secondary winding (12a) via the second wire (22), wherein the primary circuit (41) and the secondary circuit (42) are arranged side by side, where the second wire (22) is pulled out to the same side as the first wire (21), the base material (30) is provided on the side from which the first wire (21) and the second wire (22) are drawn out, the primary circuit (41) and the secondary circuit (42) are arranged along a crossing direction crossing a drawing direction in which the first wire (21) and the second wire (22) are drawn out, wherein the primary winding (11a) contains a leakage inductor (11h, 11s) which does not contribute to the transformation, and wherein the leakage inductor (11h, 11s) is provided in the insulation plate (11b) and is provided on the primary circuit (41) side in the crossing direction. [2] Transformer device (1) according to claim 1, wherein: the primary winding (11a) is formed by winding a flat, plate-like and linear first conductor (11f) around both axis lines of a coil axis line (X) and a leakage inductor axis line (X1) which is arranged more to the side of the primary circuit (41) in the crossing direction than the coil axis line (X), the secondary winding (12a) is formed by winding a flat, plate-like and linear second conductor (12e) around the coil axis line (X), and the primary winding (11a) and the secondary winding (12a) are stacked along a coil axis direction, which is a direction along the coil axis line (X). [3] Transformer device (1) according to claim 2, further comprising: a magnetic member (14) on which the primary winding (11a) and the secondary winding (12a) are provided and which contains a magnetic material, wherein the magnetic member (14) includes a wall portion (14e) provided annularly around the coil axis line (X) and surrounding outer peripheries of the primary winding (11a) and the secondary winding (12a), and the wall part (14e) contains an opening (14f) which opens on the side of the primary circuit (41) and the secondary circuit (42), the opening angle (θ) of which centered on the coil axis line is 120° to 180° and which exposes the leakage inductor (11h, 11s) and terminals of the secondary winding (12a).

Images