JP2002299130A - Composite element for power source - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composite element for a power source which can suppress voltage drop within a power unit at the time of supplying load with a large current, while contriving the downsizing of the power unit. SOLUTION: A transformer and a coil are made, so that coil windings 25, 30, and 29 and secondary windings 25, 27 and 16 form the same wiring layer 10 on a single printed board 1. The coil and the secondary winding are made of conductive material in the shape of a plate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply composite device used in a power supply device of a computer device, a portable terminal device, and other electronic devices, and particularly to a load such as a microcomputer driven at a low voltage and having a large current. The present invention relates to a power supply composite device that can supply power at a stable voltage.

[0002]

2. Description of the Related Art A power supply device performs various types of power conversion such as changing the magnitude of the voltage or current of input power. In such power conversion, a transformer element is used to convert voltage and current.

In particular, in a switching power supply device which has been frequently used in recent years to generate power for a microcomputer or the like which is driven at a low voltage and has a large current, a field effect for adjusting the power supplied to the transformer to the primary side of the transformer element is provided. Generally, a switching element such as a transistor is provided, and a coil element is generally used between a secondary side and a load to remove switching noise generated by the switching.

[0004]

However, when the field effect transistor is connected to the primary side of the transformer element and the coil element is connected to the secondary side, the power supply apparatus has the following contradictory problems. Occurs.

FIG. 10 is a partial perspective view of a power supply device for explaining the problems of the conventional power supply device.

The conventional power supply device includes a printed circuit board 80 for the power supply device, a transformer element 81 mounted on the printed circuit board 80, and a coil element 82 mounted on the printed circuit board 80.

The transformer element 81 and the coil element 82
Is electrically connected by soldering each terminal 83 to a wiring pattern 84 formed on the printed circuit board 80.

When the coil element 82 is disposed on the secondary side of the transformer element 81 in order to cope with a large current, the allowable voltage fluctuation range of the power supply device (generally, plus or minus 5 of the reference voltage) is used. %), It is necessary to suppress a voltage drop in the power supply device, and a plurality of terminals 83 are connected to the transformer element 81 and the coil element 82.
And the circuit in each element and the wiring pattern 84 must be connected with low contact resistance by the plurality of terminals 83.

In particular, when an attempt is made to construct a power supply having an output voltage of an extremely low voltage of about 1 V and a maximum current of about several hundred mA to several A, the power supply in the power supply is required. Since it is necessary to suppress the voltage drop very little, a large number of terminals must be used. as a result,
The size cannot be reduced as much as a power supply device having a power supply specification looser than the power supply specification (for example, a power supply voltage of about 5 V).

[0010] Therefore, even if a microcomputer with low power consumption and small size is used, the size of the power supply device becomes large, so that it is impossible to reduce the size of the electronic device.

According to the present invention, it is possible to reduce the voltage drop in the power supply device when providing a large current to a load while reducing the size of the power supply device. It is an object of the present invention to provide a power supply composite device capable of supplying electric power to a load such as a microcomputer at a stable voltage.

[0012]

In order to achieve the above object, a composite element for a power supply according to the present invention comprises a transformer comprising a primary winding and a secondary winding which are electromagnetically coupled to each other. A power supply composite element for converting power applied to a side winding and smoothing with a coil connected to the secondary winding, further comprising a substrate on which at least two or more wiring layers are formed. Forming the primary winding, the secondary winding, and the coil using the wiring layer, and electrically connecting the coil and the secondary winding in the same wiring layer. Is what is being done.

With this configuration, since the secondary winding and the coil are directly connected, there is no contact resistance between these circuits. Therefore, it is possible to suppress a decrease in the load supply voltage at the time of a large current, and it is possible to cope with a large current even with a constant voltage source as low as several volts, and it is possible to cope with a large current at a lower voltage.

Moreover, since the secondary winding and the coil are directly connected, the number of terminals can be reduced as compared with the conventional case, and the size can be reduced.

In the composite element for a power supply according to the present invention, an electric circuit element connected to the primary winding, the secondary winding or the coil is mounted on the substrate.

By employing this configuration, high integration can be achieved. In particular, for example, by arranging various electric circuit elements disposed between the coil and the load on the substrate, the power output from the coil can be directly supplied to the load, The contact resistance between the side winding and the load can be effectively suppressed. This allows
It is possible to cope with a large current at a lower voltage.

The power supply composite device of the present invention converts the power applied to the primary winding by a transformer comprising a primary winding and a secondary winding which are electromagnetically coupled to each other. A power supply composite element smoothed by a coil connected to a secondary winding, wherein the primary winding, the secondary winding, and the coil are each formed using a plate-shaped conductive material. In addition, the coil and the secondary winding are formed of one plate-shaped conductive material.

With this configuration, since the secondary winding and the coil are directly connected, there is no contact resistance between these circuits. Therefore, it is possible to suppress a decrease in the load supply voltage at the time of a large current, and it is possible to cope with a large current even with a constant voltage source as low as several volts, and it is possible to cope with a large current at a lower voltage.

Further, since the secondary winding and the coil are directly connected, the number of terminals can be reduced as compared with the conventional case, and the size can be reduced.

The composite element for a power supply of the present invention has a core made of a magnetic material disposed around the transformer and / or around the coil.

If this configuration is adopted, the power conversion efficiency from the primary winding to the secondary winding can be improved by the core material, and the rectification effect by the coil can be enhanced.
Efficiency and the like can be significantly improved.

In the composite element for a power supply according to the present invention, a first core covering the periphery of the transformer and a second core covering the periphery of the coil are separately provided, and the first core is The magnetic permeability is higher than that of the second core.

By adopting this configuration, the characteristics of the transformer are obtained despite the fact that the transformer and the coil, which are composed of the primary winding and the secondary winding, are formed using the wiring layer of the same substrate. And the characteristics of the coil can be optimized accordingly.

In the composite element for a power supply according to the present invention, the primary winding and the secondary winding and / or the coil may be arranged around an axis along a lamination direction of the wiring layers in the multilayer substrate. It is patterned so that it can be wound,
A through hole is opened at the axial position, and a core made of a magnetic material is provided in the through hole.

If this configuration is adopted, the primary winding and the secondary winding and / or the windings of the coil can be tightly coupled with each other at an interval between the wiring layers of the substrate. High performance transformers and / or coils.

In the power supply composite device according to the present invention, the primary winding, the secondary winding and the coil are made of copper.

With this configuration, it is possible to minimize the resistance generated inside the transformer and coil including the primary winding and the secondary winding.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A power supply composite device according to an embodiment of the present invention will be described with reference to the drawings.

Embodiment 1

FIG. 1 is a perspective view showing a power supply composite device according to Embodiment 1 of the present invention. FIG. 2 is an exploded perspective view showing the power supply composite device shown in FIG.

The composite element for power supply mainly includes a substantially rectangular printed circuit board 1 and a core or first material made of a magnetic material disposed around one end of the printed circuit board 1 in the longitudinal direction. A transformer core 2 as a core, and a core made of a magnetic material or a coil core 3 as a second core disposed around the other end of the printed circuit board 1 in the longitudinal direction are provided.

A plurality of primary signal terminals 4 and a plurality of primary ground terminals 5 are disposed on the lower surface of one end of the printed circuit board 1 in the longitudinal direction, and the secondary side is disposed on the lower surface of the central portion of the printed circuit board 1 in the longitudinal direction. A signal terminal 6 and a plurality of secondary-side ground terminals 7 are provided, and a plurality of coil output terminals 8 are provided on the lower surface of the other end of the printed circuit board 1 in the long direction. The power supply composite element is used by soldering these terminals 4,..., 8 to a printed circuit board for a power supply device (not shown) together with other power supply elements such as a capacitor.

The printed board 1 includes an insulating substrate 9 as an approximately rectangular substrate made of an insulating material, and an insulating substrate 9.
An upper surface wiring layer 10 as a wiring layer formed on the upper surface of
A lower wiring layer 11 as a wiring layer formed on the lower surface of the insulating substrate 9. The upper wiring layer 10 and the lower wiring layer 11 may be formed using a conductive material such as aluminum, but preferably, a material having a low resistance such as copper is used. 11
It is preferable to suppress the internal resistance values of the transformer and the coil formed by using.

A central portion of a portion covered by the transformer core 2 (hereinafter, referred to as a transformer circuit wiring region 12 in this embodiment) penetrates from the upper surface to the lower surface of the insulating substrate 9. A through-hole 13 for a transformer core as a hole is formed, and a center portion of a portion covered with the coil core 3 (hereinafter, referred to as a coil circuit wiring region 14 in this embodiment) is formed from the upper surface to the lower surface of the insulating substrate 9. A through-hole 15 for a coil core is formed as a through-hole so as to penetrate through.

In this embodiment, the upper wiring layer 10 and the lower wiring layer 11 in the transformer circuit wiring region 12 are formed.
Is used to form the transformer in the circuit diagram symbol, and the coil in the circuit diagram symbol is formed using the upper surface wiring layer 10 and the lower surface wiring layer 11 of the coil circuit wiring region 14.

FIG. 3 is a diagram showing an example of a wiring pattern using the upper wiring layer 10 and the lower wiring layer 11 of the printed board 1 of FIG. In the figure, a printed circuit board 1 is
The posture is described in such a manner that one end in the long direction is on the left side and the other end in the long direction is on the left side. Further, the wiring pattern on the upper wiring layer 10 is described on the upper side, and the wiring pattern on the lower wiring layer 11 is described on the lower side. In FIG. 1, the wiring pattern on the upper wiring layer 10 and the wiring pattern on the lower wiring layer 11 are both shown as wiring patterns viewed from above the printed circuit board 1. When viewed, it is visually recognized upside down.

In this wiring pattern, the lower wiring layer 11
A plurality of primary signal terminals 4 are commonly connected electrically by soldering or the like, and a plurality of primary signal terminals 4 are commonly connected electrically by soldering or the like. A primary-side ground terminal connecting portion 17, a secondary-side signal terminal connecting portion 18 to which the secondary-side signal terminal 6 is electrically connected by soldering or the like, and a plurality of secondary-side ground terminals 7 are commonly soldered. And a coil output terminal connection portion 20 to which a plurality of coil output terminals 8 are electrically connected in common by soldering or the like.

In this wiring pattern, a primary-side upper wiring pattern 21 is formed from one end of the upper wiring layer 10 to the inside of the transformer circuit wiring area 12, and the primary circuit upper wiring pattern 21 is formed from one end of the lower wiring layer 11 to the transformer circuit wiring area. The primary lower surface wiring pattern 22 is formed up to the inside of the wiring pattern 12.
One end of the primary upper surface wiring pattern 21 is electrically connected to the primary side ground terminal connecting portion 17 by an interlayer connection conductive material 23 such as a contact hole or a via hole, and one end of the primary side lower surface wiring pattern 22 is connected to the primary side. The other end of the primary-side upper wiring pattern 21 and the other end of the primary-side lower wiring pattern 22 are electrically connected to each other by the interlayer connection conductive material 24. The primary-side upper wiring pattern 21 and the primary-side signal wiring pattern 22 are formed in the transformer circuit wiring area 12.
Inside, it is formed in a substantially semicircular arc-shaped curve so as to be substantially concentric with the transformer core through-hole 13.

Next, in this wiring pattern, the secondary upper surface wiring pattern 25 is formed from the inside of the transformer circuit wiring region 12 of the upper surface wiring layer 10 to the inside of the coil circuit wiring region 14, and the transformer of the lower surface wiring layer 11 is formed. Circuit wiring area 12
A secondary-side lower surface wiring pattern 26 is formed from the inside to a position just before the coil circuit wiring region 14. One end of the secondary-side upper surface wiring pattern 25 and one end of the secondary-side lower surface wiring pattern 26 are electrically connected by an interlayer connection conductive material 27, and are substantially connected to the substantially central portion of the secondary-side upper surface wiring pattern 25. The secondary signal terminal connecting portion 18 and the interlayer connecting conductive material 28
Electrically connected by the secondary side lower surface wiring pattern 2
6 and the secondary-side ground terminal connection portion 19 are electrically connected. Also, the secondary side upper surface wiring pattern 25
The secondary lower surface wiring pattern 26 is formed in the transformer circuit wiring region 12 in a substantially semicircular arc-shaped curve (half turn) which is substantially concentric with the transformer core through-hole 13.

Further, in this wiring pattern, a coil lower wiring pattern 29 is formed from inside the coil circuit wiring area 14 of the lower wiring layer 11 to the other end of the lower wiring layer 11. One end of the coil lower surface wiring pattern 29 and the other end of the secondary side upper surface wiring pattern 25 are electrically connected by an interlayer connection conductive material 30, and the other end of the coil lower surface wiring pattern 29 is connected to the coil output terminal. The unit 20 is electrically connected. In addition, the secondary upper surface wiring pattern 25 and the coil lower surface wiring pattern 29 are provided in the coil circuit through-hole 15 in the coil circuit wiring region 14.
It is formed in a substantially arc-shaped curve (one turn) which is substantially concentric.

In this embodiment, the number of turns from the primary upper wiring pattern 21 to the primary lower wiring pattern 22 (hereinafter collectively referred to as primary wiring) and the secondary upper wiring pattern Although the number of turns from 25 to the secondary lower surface wiring pattern 26 (hereinafter collectively referred to as secondary wiring) is set to a half turn,
The number of these turns is not limited to these, and it goes without saying that it is determined according to the power conversion efficiency and other characteristics of the transformer. Similarly, in this embodiment,
Although the number of turns from the secondary upper surface wiring pattern 25 to the coil lower surface wiring pattern 29 (hereinafter, these are collectively called a coil or a coil winding) is set to one turn,
The number of turns is not limited to these, and it is needless to say that the number of turns is determined according to the reactance value and other characteristics of the coil.

In this embodiment, the winding direction of the primary wiring and the winding direction of the secondary wiring in the transformer circuit wiring area 12 are reversed, but they may be the same.

Next, in this embodiment, the primary side wiring,
The winding shape of the secondary side wiring and the coil winding is an arc shape, but may be a square side shape or another wiring shape.

Further, in this embodiment, the same area as the area covered by the transformer core 2 is used as the transformer circuit wiring area 12, and the primary side wiring and the secondary side wiring are wound in this area 12. (In other words, although the transformer circuit wiring area 12 around which the primary side wiring and the secondary side wiring are wound is covered with the transformer core 2),
The transformer circuit wiring area 12 may be set wider than the area covered by the transformer core 2, and the primary wiring and the secondary wiring may be wound so as to protrude from the transformer core 2. The same applies to the relationship between the coil core 3 and the coil circuit wiring area 14.

In the power supply composite device having the wiring pattern thus formed, for example, AC power is applied between the primary signal terminal 4 and the primary ground terminal 5,
A current flows from the primary signal terminal 4 to the primary signal terminal connection portion 16, the primary side lower wiring pattern 22, the interlayer connection member 24, the primary upper surface wiring pattern 21, the interlayer connection member 23, and the primary ground terminal connection portion 17. And the secondary wiring close to the primary wiring, the secondary upper wiring pattern 25,
A current flows toward the interlayer connection member 27 and the primary lower surface wiring pattern 26. Also, a magnetic flux in a predetermined direction is formed in the transformer core 2 by a current flowing through the primary side wiring,
This allows more current to flow through the secondary wiring.

The current flowing through the secondary-side top wiring pattern 25 is input from the coil output terminal connection section 20 and is transmitted through the coil circuit wiring area 14 to the transformer circuit wiring area 1.
2 to generate a current flow. If a predetermined load circuit is connected between the coil output terminal 8 and the secondary-side ground terminal 7, the load circuit can be operated with the above current.

The transformer core 3 is disposed below the printed circuit board 1 and includes a lower transformer core 31 made of a magnetic material.
And an upper transformer core 32 disposed on the upper side of the printed circuit board 1 and made of a magnetic material. The lower transformer core 31 and the upper transformer core 32 both have
When the printed circuit board 1 is sandwiched between the pair of edges, there are formed upright portions 33 having a height to abut against each other. When the printed circuit board 1 is sandwiched between the respective central portions, the through holes 13 for the transformer core are formed. In the inside, the cores 34 having the heights that abut against each other are erected. The upright portion 33 and the core portion 34 may be provided on only one of the upper transformer core 32 and the lower transformer core 31.

The coil core 3 is disposed below the printed circuit board 1 and has a lower coil core 35 made of the same magnetic material as the transformer core 2, and is disposed above the printed circuit board 1 and has the same magnetic properties as the transformer core 2. And an upper coil core 36 made of a material. Then, the lower coil core 35
In both the upper coil core 36 and the upper coil core 36, a standing portion 37 having a height which is in contact with each other when the printed circuit board 1 is sandwiched between the pair of edges is formed, and the printed circuit board 9 is sandwiched between the respective central portions. A center portion 38 having a height at which a slight gap is sometimes formed is provided upright. The upright portion 37 and the core portion 38 may be provided on only one of the upper coil core 36 and the lower coil core 35.

By providing a gap between the cores 38 of the coil core 3 in this manner, it is possible to use a magnetic material similar to that of the transformer core 2 but to have a lower magnetic permeability than the transformer core 2. Note that a magnetic material having low magnetic permeability may be used.

FIG. 4 is a circuit diagram showing a circuit configuration of a forward converter using the power supply composite device of FIG.

In this forward converter, one 39 of a pair of input terminals is connected to the primary signal terminal 4 and the other 40 is connected to the primary ground terminal 5 via an input field effect transistor 41 as an electric circuit element. It is connected. Further, between the pair of input terminals 39 and 40, these composite element for power supply and input side field effect transistor 41 are provided.
An input capacitor 42 as an electric circuit element is connected so as to be connected in parallel to the whole. The input-side field effect transistor 41 is turned on and off by a primary-side control circuit 43 as an electric circuit element.

On the output side, one of the pair of output terminals 4
4 is connected to the coil output terminal 8, and the other 45 is connected to the secondary ground terminal 7 via the output first field effect transistor 46 as an electric circuit element. An output capacitor 47 as an electric circuit element is connected between the pair of output terminals 44 and 45 so as to be connected in parallel to the entire power supply composite element and the output side field effect transistor 46. I have.

An output-side second field-effect transistor 48 as an electric circuit element is connected between the secondary-side signal terminal 6 and the other output terminal 45. The output side second field effect transistor 48 is controlled by the secondary side control circuit 49 as an electric circuit element together with the output side first field effect transistor 46.

In such a circuit, the primary side control circuit 43
, The input-side field-effect transistor 41 is turned on and off, and a current flows through the primary winding by the power input to both ends of the input capacitor 42. Then, a current also flows in the secondary winding in accordance with the change in the current flowing in the primary winding, and a voltage generated in the output capacitor 47 by this current is applied to the load. Further, the voltage applied to the load is also input to the primary side control circuit 43, and the primary side control circuit 43 controls the duty and cycle of the on / off control so that the voltage becomes a predetermined voltage. As a result, a predetermined voltage can be applied to the load.

Since the secondary winding and the coil winding are directly connected in the wiring layer (upper wiring layer 10) of the printed circuit board 9 in the composite power element according to this embodiment, a large current Even when the power supply flows, the voltage supplied to the output capacitor 47 and the load hardly drops, and the voltage fluctuation width of the power supply device can be effectively suppressed. Therefore, even if the reference output voltage is an extremely low voltage of about 1 V, the maximum current at that time is several hundred mA.
Even if it is about several A, the power supply device can be made to satisfy a predetermined output voltage fluctuation specification such as, for example, a voltage fluctuation range plus or minus 5%.

Almost all of the current flowing through the secondary winding also flows through the coil winding. As a result, harmonic components and the like generated due to the power conversion in the switching control are removed, and high-quality power can be supplied to the load. The secondary-side control circuit 49 includes a secondary-side first field-effect transistor 46 and a secondary-side second field-effect transistor 4.
8 is controlled to operate these diodes when normal and to disconnect the load when power is abnormal.

As described above, in this embodiment, since the secondary winding and the coil winding are directly connected by the secondary upper surface wiring pattern 25, contact between these circuits is made. Since there is no resistance or the like, a decrease in the load supply voltage at the time of a large current can be effectively suppressed. Therefore, it is possible to cope with a large current of about several A even with a constant voltage source as low as about several volts, and it is possible to cope with a large current at a lower voltage.

Furthermore, since the secondary winding and the coil winding are directly connected, the number of terminals connecting these can be reduced, and the size can be reduced.

In addition, since the transformer core 2 is provided around the transformer circuit forming region 12 where the primary winding and the secondary winding are provided, the primary winding is formed by the transformer core 2. The power conversion efficiency from the power to the secondary winding can be improved, and the efficiency and the like can be significantly improved. Similarly, since the coil core 3 is provided around the coil circuit formation region 14, the rectifying effect of the coil can be enhanced.

Moreover, since the coil core 3 and the transformer core 2 are separately formed, it is possible to prevent the magnetic force between them (interference) as compared with the case where they are integrally formed. In particular, by forming them separately in this manner, the transformer core 2 has a higher magnetic permeability than the coil core, even though the transformer winding and the coil winding are formed using the same printed circuit board 1. , The characteristics of the transformer and the characteristics of the coil can be optimized accordingly.

Further, through holes 13 and 15 are formed in the printed circuit board 1.
And the cores of the cores 2 and 3 made of a magnetic material are inserted therein, and the respective windings are disposed substantially concentrically around the through holes 13 and 15, so that the primary side It is possible to form a high-performance transformer and coil by tightly coupling the winding and the secondary winding, and the coil windings at intervals between the wiring layers 10 and 11 of the substrate. Can be.

The above embodiment is a preferred embodiment of the present invention, but various changes can be made without departing from the spirit of the present invention. For example, as shown in FIG. 5, as shown in FIG. 5, even if a single secondary side copper plate 50 that is wound at both ends is used, the secondary side winding of the transformer and the coil may be used. It can be connected with low resistance (in other words, the transformer and the coil can be connected without interposing a contact resistance between them), and the drop of the secondary output voltage at the time of a large current is suppressed. be able to.

Another composite element for power supply is a secondary copper plate 5
In addition to 0, the primary side copper plate 51 with the center portion wound
And one end of the primary side copper plate and the secondary side copper plate are molded with a transformer resin body 52. Both ends and the center of the secondary copper plate, and both ends of the primary copper plate are buckled so that they can be used as terminals for soldering to a printed circuit board for a power supply device (not shown). ing. With this structure, the contact resistance between the printed circuit board 1 and each of the terminals 4,..., 8 can also be eliminated, and the drop of the secondary-side output voltage at the time of a large current can be further suppressed. it can.

In the other power supply composite device, the other end of the secondary copper plate is also molded with the coil resin body 53. A magnetic material may be mixed in the resin of the coil resin body 53 and the transformer resin body 52, or a core made of a magnetic material may be provided on the outer periphery of the coil resin body 53 and the transformer resin body 52.

In this embodiment, the printed circuit board 1 having the wiring layers 10 and 11 formed only on the upper surface and the lower surface is used.
, The circuit of the transformer and the coil is configured, but it goes without saying that a multilayer substrate having an intermediate wiring layer may be used. This makes it possible to make the coupling between the primary winding and the secondary winding dense and to improve the power conversion efficiency and the like.

FIG. 6 is a diagram showing an example of a wiring pattern when a multilayer printed circuit board is used. An intermediate wiring layer 57 on which a primary middle wiring pattern 54, a secondary middle wiring pattern 55, and a coil middle wiring pattern 56 are formed is added to the multilayer printed board. By increasing the number of wiring layers in this way, the primary winding, the secondary winding,
The number of turns of each of the coil windings can be increased.
In the case of generating low voltage, large current power,
In order to increase power conversion efficiency, a printed circuit board having about 12 wiring layers may be used.

FIG. 7 is a diagram showing an example of another wiring pattern when a multilayer printed board is used. In this multilayer printed board, the primary winding and the secondary winding are in the same winding direction. On the upper surface and the lower surface, one winding cannot be wound a plurality of times. However, in the intermediate device, one winding is formed as an outer winding and the other winding is formed as an inner winding, so that the primary winding is formed. And the secondary winding can be wound multiple times. That is, by using a printed circuit board having three or more wiring layers, it is possible to efficiently increase the number of turns,
Practical power conversion efficiency can be obtained.

Further, in this embodiment, for example, the field effect transistors 41, 46, 4
Although electric circuit elements connected to the primary winding, the secondary winding, or the coil such as 8 and the capacitors 42 and 47 are not mounted, these elements may be mounted. In this case, high integration of the entire power supply device can be achieved.

In particular, for example, by disposing an electric circuit element such as an output capacitor 47 disposed between a coil and a load on a printed circuit board, the coil output terminal can be used as an output terminal of a power supply. This makes it possible to further improve the specifications of the power supply device.

The multilayer printed circuit board itself may be formed by the same manufacturing process as a normal printed circuit board, but is not limited thereto. For example, as shown in FIGS. 8 and 9, a plurality of separately formed one-layer or two-layer printed circuit boards 58 may be stacked. At this time, when the wiring layers face each other and overlap with each other, an insulating substrate 59 or the like may be interposed therebetween. As a result, a wiring layer having a thickness greater than that of a general multilayer printed circuit board can be formed and used by a thick film forming technique or the like, and the resistance of a transformer or a coil can be reduced in the same board area. .

[0071]

According to the present invention, it is possible to reduce the voltage drop in the power supply device when providing a large current to the load while reducing the size of the power supply device. It is possible to provide a power supply composite device that supplies power at a stable voltage to a load such as a microcomputer with a large current.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a power supply composite device according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view showing the power supply composite device shown in FIG.

FIG. 3 is a diagram illustrating an example of a wiring pattern of the printed circuit board in FIG. 1;

FIG. 4 is a circuit diagram showing a circuit configuration of a forward converter using the power supply composite device of FIG. 1;

FIG. 5 is a perspective view showing another power supply composite device.

FIG. 6 is a diagram illustrating an example of a wiring pattern when a multilayer printed board is used.

FIG. 7 is a diagram illustrating an example of another wiring pattern when a multilayer printed board is used.

FIG. 8 is a diagram illustrating an example of a method for manufacturing a multilayer printed circuit board.

FIG. 9 is a diagram illustrating another example of a method for manufacturing a multilayer printed circuit board.

FIG. 10 is a partial perspective view of a power supply device for describing a problem of a conventional power supply device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Printed circuit board 2 Transformer core (core, 1st core) 3 Coil core (core, 2nd core) 4 Primary signal terminal 5 Primary ground terminal 6 Secondary signal terminal 7 Secondary ground terminal 8 Coil output terminal Reference Signs List 9 insulating substrate (substrate) 10 upper wiring layer (wiring layer) 11 lower wiring layer (wiring layer) 12 transformer circuit wiring area 13 through hole for transformer core (through hole) 14 coil circuit wiring area 15 through hole for coil core (through Hole) 16 Primary signal terminal connection 17 Primary ground terminal connection 18 Secondary signal terminal connection 19 Secondary ground terminal connection 20 Coil output terminal connection 21 Primary top surface wiring pattern (primary winding) 22 Primary lower surface wiring pattern (Primary winding) 23 Interlayer connecting conductive material 24 Interlayer connecting conductive material (Primary winding) 25 Secondary side upper wiring pattern ( Secondary winding, coil) 26 Secondary lower surface wiring pattern (secondary winding) 27 Interlayer conductive material (secondary winding) 28 Interlayer conductive material 29 Coil lower surface wiring pattern (coil) 30 Interlayer connection Conductive material (coil) 31 Lower transformer core 32 Upper transformer core 33 Standing part 34 Core 35 Lower coil core 36 Upper coil core 37 Standing part 38 Core 39, 40 Input terminal 41 Input side field effect transistor (electric circuit element) 42 Input capacitor (electric circuit element) 43 Primary-side control circuit (electric circuit element) 44, 45 Output terminal 46 Output-side first field-effect transistor (electric circuit element) 47 Output capacitor (electric circuit element) 48 Output-side second field effect Transistor (electric circuit element) 49 Secondary side control circuit (electric circuit element) 50 Secondary side copper plate (plate-shaped conductive material) Material 51 Primary copper plate (plate-shaped conductive material) 52 Trans-resin body 53 Coil resin body 54 Primary-side middle-layer wiring pattern 55 Secondary-side middle-layer wiring pattern 56 Coil middle-layer wiring pattern 57 Intermediate wiring layer 58 Printed circuit board 59 Insulation Substrate

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5E043 AB02 AB03 BA01 5H730 AA15 AS01 AS05 BB23 BB57 DD04 EE02 EE08 EE10 EE13 FD01 FG01 ZZ04 ZZ11 ZZ12 ZZ16 ZZ17

Claims (7)

[Claims] An electric power applied to said primary winding is converted by a transformer comprising a primary winding and a secondary winding which are electromagnetically coupled, and further connected to said secondary winding. A composite element for power supply smoothed by a coil, comprising a substrate on which at least two or more wiring layers are formed, wherein each of the primary winding, the secondary winding, and the coil is connected to the wiring layer. Wherein the coil and the secondary winding are electrically connected in the same wiring layer. 2. The power supply composite according to claim 1, wherein the circuit board is provided with an electric circuit element connected to the primary winding, the secondary winding, or the coil. element. 3. A transformer comprising a primary winding and a secondary winding, which are electromagnetically coupled, converts power applied to the primary winding, and further converts the power applied to the secondary winding. A power supply composite element which is smoothed by a coil, wherein the primary winding, the secondary winding, and the coil are each formed using a plate-shaped conductive material. The composite element for a power supply, wherein the secondary winding is formed of one plate-shaped conductive material. 4. A composite for a power supply according to claim 1, wherein a core made of a magnetic material is provided around the transformer and / or around the coil. element. 5. A first core that covers the periphery of the transformer and a second core that covers the periphery of the coil are separately provided, and the first core is more than the second core. The composite element for a power supply according to claim 1, wherein the composite element has a high magnetic permeability. 6. The primary winding and the secondary winding and / or the coil is patterned so as to be wound around an axis along a stacking direction of a wiring layer in the multilayer substrate. 3. The composite element for a power supply according to claim 1, wherein a through hole is opened at the axial position, and a core made of a magnetic material is provided in the through hole. 7. The composite element for a power supply according to claim 1, wherein the primary winding, the secondary winding, and the coil are made of copper.