JP2544054Y2 - Power supply - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a power supply device.

(Prior Art) Conventionally, as shown in FIG. 4, a power supply device is formed by mounting and connecting a radiator 11, a plurality of rectifying elements 12, and a transformer 13 on a printed circuit board 10 on which a conductive pattern is formed. is there.

The transformer 13 performs voltage conversion, and is formed by winding a coil for voltage conversion. A lead wire 14 drawn from the coil is connected to a conductive pattern on the printed circuit board 10.

The plurality of rectifying elements 12 rectify the transformed output of the transformer 13, are screwed to the radiator 11, and are connected in parallel on the printed circuit board 10 to increase the current capacity.

The transformer 13 and the radiator 11 are screwed from the back surface of the printed circuit board 10.

(Problems to be solved by the invention) However, in the conventional power supply device, the radiator 11
In addition, since the plurality of rectifying elements 12 are arranged side by side on the printed circuit board 10, their occupied area on the printed circuit board 10 is large, and this is a factor that hinders miniaturization of the device. Further, since the shape of the radiator is elongated, there is a disadvantage that the air flow between the fins is deteriorated and the heat radiation efficiency is deteriorated.

The present invention has been made in view of the above circumstances, and an object of the invention is to provide a power supply device capable of reducing the size of a device and improving heat radiation efficiency.

[Configuration of the Invention] (Means for Solving the Problems) The present invention relates to a plurality of transformers each including an anode-side electrode, a cathode-side electrode, and a heat-dissipating metal surface electrically connected to one of the electrodes. In a power supply device having a rectifier element and a radiator, a first metal member is attached to a heat receiving surface of the radiator, and the plurality of the plurality of radiators are provided on a surface of the first metal member opposite to a side on which the radiator is attached. The rectifying elements are arranged in a matrix and the heat-dissipating metal surface is soldered to the first metal member, and a second metal member is disposed on the first metal member so as to face the first metal member at an interval. Second
The other electrode of the rectifying element is soldered to the metal member, an electrically insulating spacer is interposed between the first and second metal members, and the first metal member contacts the radiator. In this state, the first and second metal members are fastened to the radiator by screws in which the second metal member is electrically insulated, and the transformer is mounted on the second metal member. The output terminal of the transformer is electrically connected to the second metal member, so that the transformer, the rectifying element, and the radiator form a three-layer structure. .

(Operation) In the present invention, a plurality of rectifiers and transformers are sequentially arranged in a three-layer structure on the radiator via the first and second metal members. This has a unique effect that the area occupied by the substrate surface can be greatly reduced even when the substrate is mounted. Also,
Not only the rectifying element but also the heat generated in the transformer can be radiated by one radiator, so that the radiation efficiency is also improved.

(Examples) Hereinafter, the present invention will be described specifically with reference to examples.

1A and 1B are a front view and a side view showing an embodiment of the present invention. In FIG. 1 (b), the transformer 21 in FIG. 1 (a) is omitted.

As shown in the figure, the present embodiment device includes a transformer 21, rectifying elements 22a to 22d, 23a to 23d, 24a to 24d, and a radiator 25.

The rectifier elements 22a to 24d each include an anode-side electrode and a cathode-side electrode and a heat-dissipating metal surface, and the heat-dissipating metal surface can be used as one of the above-described electrodes. The surface is electrically connected internally. As shown in FIG. 3, this type of rectifying element generally incorporates _two diodes D ₁ and D ₂ , and an anode electrode and a common cathode electrode of each diode are led out. In the present embodiment, the common cathode electrode terminal is cut off at its base, and the metal surface for heat dissipation is positively used as the cathode electrode.

The rectifying elements 22a to 24d are arranged in a matrix on the first metal member 26, and the heat dissipation metal surface of each rectifying element is soldered to the first metal member 26. This makes the first
Has the same potential as the cathodes of all the rectifying elements 22a to 24d. As the first metal member 26, a metal having good heat conductivity and conductivity, for example, copper formed in a thin plate shape is applied.

Further, the anode electrodes of the rectifying elements 22a to 24d are arranged opposite to the first metal member 26 at a predetermined interval.
Are connected to the metal members 27 and. That is, the rectifying elements 22a to 22d are connected to the second metal member 27,
23a to 23d and 24a to 24d are connected to the second metal member 28. The connection of the anode electrode to the second metal member is
This is performed by inserting a corresponding anode electrode (lead wire) into a small hole preliminarily formed in a predetermined location of the second metal members 27 and 28 and soldering the same. Copper is used as the second metal members 27 and 28. The first metal member 26 and the second metal members 27 and 28 are kept parallel with a predetermined gap A by interposing spacers 38 and 39 formed in a cylindrical shape by an insulating material. Further, the heat sink 26 is fastened to the radiator 26 by screws 29, 30 electrically insulated from the second metal members 27, 28 by interposing the insulating bushings 40, 41, respectively. FIG. 2 shows the details of this joint fastening state. The radiator 25 has a heat receiving surface, and the first metal member 26 is attached to the heat receiving surface.

The radiator 25 is formed of aluminum, and is attached to the printed circuit board 10A via an angle 25a, for example.

The transformer 21 has a bobbin 31, mounting portions 34 and 35 extending from the end of the bobbin 31, and a core 37 mounted on the bobbin 31, and transforms an AC voltage. The modified output of the transformer is applied to the second metal members 27 and 28. The mounting portions 34 and 35 include:
By bending the extending end, a contact surface capable of contacting the second metal members 27 and 28 is formed. The transformer 21 is mounted by abutting the contact surfaces on the second metal members 27 and 28 and fixing them with screws 44 and 45.

In this way, the radiator 25, the plurality of rectifying elements 22 to 24, and the transformer 21 are configured as a three-layer structure via the first and second metal members, respectively.

FIG. 3 is a circuit diagram of the present embodiment, in which one secondary coil end of the transformer 21 is connected to the anodes of the rectifying elements 22a to 22d (by the second metal member 27) and the other secondary coil is connected. The ends are connected to the anodes of the rectifying elements 23a to 23d and 24a to 24d (by the second metal member 28). The anodes of all the rectifying elements 22a to 24d are connected (by the first metal member 26), and this is a rectifying output terminal. In particular, this circuit configuration is premised on application to a switching regulator, and a switching circuit is connected to the primary side of the transformer 21. The rectifying elements 23a to 24d function as so-called freewheeling diodes when a choke coil is connected to the output terminal side of the circuit. In FIG. 3, the rectifying elements 23d, 24a to 2
Although 4d is omitted, it goes without saying that it is inserted and connected in parallel to the rectifying element 23a and the like. As described above, in the present embodiment, the plurality of rectifying elements 22a to 24d are arranged in a matrix on the first metal member 26, and the heat-dissipating metal surfaces (corresponding to the cathodes) of the plurality of rectifying elements are formed in the first metal member 26. And the anode of the rectifying element is soldered to the second metal members 27 and 28.
Since the components are not arranged side by side on the printed circuit board 10 as shown in FIG. In particular, a plurality of rectifying elements are mounted on the heat receiving surface of the radiator via the first metal member,
Since a three-layer structure in which a transformer is mounted thereon via a second metal member is mounted on the substrate, the effect of reducing the occupied area is extremely large. Also, by soldering the heat dissipating metal surface of the rectifying element to the first metal member 26,
Furthermore, with the spacers 38, 39 interposed between the first metal member 26 and the second metal members 27, 28, the first metal member 26 and the second metal member 27 are , And 28 are fixed to the radiator 25, so that the first metal member 26, the radiator 25, and the radiating metal surface of the rectifier have the same potential, and an insulating member is provided between the rectifier and the radiator. There is no need to intervene. Further, since the elongated shape of the radiator is reduced, the heat radiation efficiency can be improved, and the size of the radiator can be reduced accordingly.

Further, since the heat dissipating metal surfaces of the rectifying elements 22a to 24d are soldered to the first metal member 26, the electric resistance can be reduced as compared with, for example, screwing each rectifying element as shown in FIG. There are advantages too.

Further, in the present embodiment, the second metal members 27, 2
8 is used to form a conductive path, which is not formed by the conductive pattern of the printed circuit board 10 as in the prior art. Therefore, the rectification is performed by setting the cross-sectional areas of the second metal members 27 and 28 to be sufficiently large. There is also an advantage that the output current can be easily increased.

Further, the conductive path from the transformer 21 to the rectifying elements 22a to 24d can be shortened, whereby the leakage inductance of the conductive path can be reduced. There is also an advantage that it can be achieved.

 The present invention is not limited to the above embodiment.

[Effects of the Invention] In the present invention, a plurality of rectifying elements and transformers are sequentially arranged in a three-layer structure on the radiator via the first and second metal members, respectively. As a result, a unique effect that the occupied area of the board surface can be greatly reduced even when the apparatus is mounted on a printed board is provided. Moreover, not only the rectifier element but also the heat generated in the transformer can be radiated by one radiator, so that the radiation efficiency is also improved.

[Brief description of the drawings]

1 (a) and 1 (b) are a front view and a side view showing one embodiment of the present invention, FIG. 2 is a cross-sectional view showing details of a main part thereof,
FIG. 3 is a circuit diagram of this embodiment, and FIG. 4 is a perspective view of a conventional example. 21 ... Transformers, 22a to 22d, 23a to 23d, 24a to 24d ...
... Rectifier element, 25 ... Heat radiator, 26 ... First metal member, 2
7, 28 ... second metal member, 29, 30 ... screw, 38, 39 ... spacer.

Claims (1)

(57) [Scope of request for utility model registration] 1. A power supply apparatus comprising: a plurality of rectifiers and a radiator having a transformer, an anode-side electrode and a cathode-side electrode, and a heat-dissipating metal surface electrically connected to any one of the electrodes. A first metal member is mounted on a heat receiving surface of the radiator, and the plurality of rectifying elements are arranged in a matrix on a surface of the first metal member opposite to a side on which the radiator is mounted, and the radiating metal is provided. A surface is soldered to the first metal member, and a second metal member is disposed on the first metal member so as to face the second metal member at a distance.
The other electrode of the rectifying element is soldered to the metal member, an electrically insulating spacer is interposed between the first and second metal members, and the first metal member contacts the radiator. In this state, the first and second metal members are fastened to the radiator by screws in which the second metal member is electrically insulated, and the transformer is mounted on the second metal member. A power supply device, wherein the output end of the transformer is electrically connected to the second metal member, so that the transformer, the rectifying element, and the radiator form a three-layer structure.