JP2009224392A - Power supply device - Google Patents

Abstract

Provided is a power supply device that can improve heat dissipation characteristics of a power transformer and can cope with a large current.
A power supply device for converting an input voltage into another voltage via a power transformer having a primary winding and a secondary winding, the power supply main body converting the input voltage into another voltage. A printed wiring board 3 on which the part 1 is mounted, a heat radiating plate 10 and a bus bar 7a made of a conductor plate. It is connected to the main body 1.
[Selection] Figure 1

Description

  The present invention relates to a power supply device that converts an input voltage into another voltage via a power transformer, and more particularly to a component mounting structure of a converter transformer as a power transformer.

  In a power supply device such as a DC-DC converter or an AC-DC converter, a converter transformer is used as a power transformer. A power supply device having this converter transformer is mounted on a printed wiring board and used. In this case, the converter transformer mounted on the printed wiring board is radiated to the printed wiring board. For this reason, the converter transformer is radiated by cooling the converter transformer with direct air such as forced air cooling.

  As a conventional power supply device of this type, Patent Document 1 is a power supply transformer and a switching power supply having a heat dissipation structure in which generated heat is efficiently released and heat dissipation characteristics are good, and includes a primary coil and a secondary power supply. In a power transformer including a coil and a core part having an axial core portion around which the coil is wound, the secondary coil is a flat coil having a hole inside the annular portion, and the flat coil is a terminal And the heat radiating foot are connected to the annular portion, and the heat radiating foot protrudes from the side facing the terminal portion across the hole.

As a conventional power supply device of this type, Patent Document 2 is a DC-DC converter that simplifies the assembly process while ensuring the reliability of electrical connection between a transformer and a choke coil. And the secondary coil each include a winding portion formed of a plate-like conductive member and a connection end portion drawn from the winding portion, between the connection end portion of the primary coil and the inverter, and the secondary coil At least one of the connection end of the coil and the rectifier circuit is electrically connected by wire bonding.
JP 2004-303823 A JP 2006-288052 A

  However, when the power consumption increases like the converter transformer, the power transformer of Patent Document 1, and the transformer of Patent Document 2, the method of mounting this transformer on a printed wiring board has a limit in heat dissipation capability.

  An object of the present invention is to provide a power supply device that improves the heat dissipation characteristics of a power transformer and can cope with a large current.

  In order to solve the above-mentioned problem, a first invention is a power supply device that converts an input voltage into another voltage via a power transformer having a primary winding and a secondary winding, wherein the input voltage is A printed wiring board on which a power supply main body for converting to another voltage is mounted, a heat sink, and a bus bar made of a conductor plate, and the power transformer is disposed on the heat sink and through the bus bar. It is connected to the main body of the power supply device.

  According to a second invention, in the first invention, a fixing bracket for fixing the power transformer to the heat radiating plate, a first insulating plate disposed between the power transformer and the fixing bracket, and the fixing And a second insulating plate disposed between the metal fitting and the bus bar.

  According to the first aspect of the invention, the heat dissipation characteristic of the power transformer is improved by mounting the power transformer on the heat sink. Further, since the power transformer is connected to the main body of the printed circuit board via the bus bar, a large current can be handled.

  According to the second invention, the power transformer can be fixed to the heat radiating plate by the fixing bracket, and the power transformer, the bus bar, and the fixing bracket can be insulated from each other by the first insulating plate and the second insulating plate.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  1 is a printed wiring board mounting diagram of a power supply device according to a first embodiment of the present invention. The power supply device shown in FIG. 1 converts an input voltage into another voltage via a converter transformer (the power supply transformer of the present invention), and is, for example, a DC-DC converter or an AC-DC converter.

  This power supply device is made of a material having good thermal conductivity such as a power supply control unit 1, a printed wiring board 3, a converter transformer 5, bus bars 7a and 15a made of a conductor plate, diodes 9a, 9b, 9c and 9d, and an aluminum plate. A heat sink 10 is provided.

  The printed wiring board 3 mounts a power supply device control unit 1 that converts an input voltage into another voltage. The converter transformer 5 has a primary winding 6a and secondary windings 6b and 6c wound around a core. The printed wiring board 3, the converter transformer 5, the bus bars 7a and 7b, and the diodes 9a, 9b, 9c, and 9d are disposed on one surface of the heat sink 10 (the heat radiating plate of the present invention). Fins 10a are provided on the other surface of the heat sink 10 at regular intervals, and the heat dissipation effect is improved by increasing the surface area with the plurality of fins 10a.

  The elongated bus bar 7 a is bent at both ends, and one end of the bus bar 7 a is soldered to the secondary winding electrode 6 b of the flat transformer 5. The other end of the bus bar 7 a is connected to the power supply main body 1 of the printed wiring board 3. The diodes 9a, 9b, 9c, and 9d constitute a rectifying / smoothing circuit.

  According to the power supply device of the first embodiment configured as described above, the heat dissipation characteristic of the converter transformer 5 is improved by mounting the converter transformer 5 on the heat sink 10. Further, since the converter transformer 5 is connected to the power supply main body 1 of the printed wiring board 3 through the bus bar 7a, it is possible to cope with a large current.

  Moreover, according to the power consumption of the converter transformer 5, the heat dissipation characteristics can be improved by increasing the size of the heat sink 10 or cooling the heat sink 10 with air.

  FIG. 2 is a printed wiring board mounting diagram of the power supply device according to the second embodiment of the present invention. 2A is a cross-sectional view of the power supply device according to the second embodiment, FIG. 2B is a top view of the power supply device according to the second embodiment, and FIG. 2C is a side view of the power supply device according to the second embodiment. .

  As shown in FIGS. 2A and 2B, the converter transformer 5 is fixed to the heat sink 10 with screws 17 by fixing brackets 13. An insulating spacer 11a (a first insulating plate of the present invention) is disposed between the fixture 13 and the converter transformer 5. An insulating spacer 11b is disposed between the fixture 13 and the bus bar 7a.

  The diodes 9 a to 9 d are fixed to the heat sink 10 with screws 20. One ends of the diodes 9a to 9b are connected to the bus bar 18a, and one ends of the diodes 9c to 9d are connected to the bus bar 18b. The other ends of the diodes 9a to 9b are connected to the bus bar 15a, and one ends of the diodes 9c to 9d are connected to the bus bar 15b.

  As described above, according to the power supply device of the second embodiment, the converter transformer 5 can be fixed to the heat sink 10 by the fixing bracket 13, and between the converter transformer 5, the bus bar 7 a, and the fixing bracket 13 by the insulating spacers 11 a and 11 b. Insulation can be achieved.

  The present invention is applicable to power supply devices such as a DC-DC converter and an AC-DC converter.

It is a printed wiring board mounting diagram of the power supply device according to the first embodiment of the present invention. It is a printed wiring board mounting view of the power supply device according to the second embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Power supply main-body part 3 Printed wiring board 5 Converter transformer 6a Primary winding 6b, 6c Secondary winding 7a, 15a, 15b, 18a, 18b Bus bar 9a, 9b, 9c, 9d Diode 10 Heat sink 10a Fin 11a, 11b Insulation Spacer 13 Fixing bracket 17, 20 Screw

Claims (2)

A power supply device that converts an input voltage into another voltage via a power transformer having a primary winding and a secondary winding,
A printed wiring board mounted with a power supply main body for converting the input voltage into another voltage;
A heat sink,
A bus bar made of a conductor plate,
The power supply device is disposed on the heat radiating plate and connected to the power supply device main body through the bus bar. A fixing bracket for fixing the power transformer to the heat sink;
A first insulating plate disposed between the power transformer and the fixture;
A second insulating plate disposed between the fixing bracket and the bus bar;
The power supply device according to claim 1, further comprising:

Images