JPS6056281B2 - composite transformer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a composite transformer mainly used for a switching type power transformer.

In a conventional switching type power transformer device, a plurality of transformers such as a switching transformer, a driver transformer, a line filter transformer, etc. are used.

Conventionally, a plurality of single transformers 1 are used for each of these transformers, as shown in FIG. 3, and mounted on a board.

In addition, figure A shows the primary coil 3 by winding the magnetic core 2.
, is a perspective view of a transformer 1 forming a secondary coil 4, and FIG. 1B is an equivalent circuit diagram of FIG. Another conventional example is a composite transformer in which a plurality of iron cores are integrally constructed to form a plurality of transformers, as shown in Japanese Utility Model Publication No. 40-27129.

Problems to be Solved by the Invention Among the above conventional techniques, in the former configuration of the transformer, a plurality of separate transformers are used, which increases the size of the power supply device, and also increases the number of man-hours required to assemble the transformer to the board. The disadvantage is that mass production becomes difficult because multiple transformers are manufactured.

On the other hand, in the latter composite transformer configuration, magnetic flux passes through the iron core, and this magnetic flux causes one of the adjacent transformers to have a magnetic influence on the other transformer, and this composite transformer is used in the above power transformer. In this case, there were drawbacks such as waveform distortion and malfunction. Therefore, an object of the present invention is to provide a composite transformer that solves the above problems.

A means to solve the problem is to form a plurality of winding frames by joining half-shaped magnetic cores each having a plurality of recesses, and to wind the windings on the winding frames to form a plurality of independent transformers. At the same time, a slit is formed between each transformer by the recessed portion, and a short-circuiting wire passing through the slit is provided near both ends of the slit.

It is possible to downsize the operating device and reduce magnetic influence between adjacent transformers.

Example Next, examples of the present invention will be described.

1A and 1B show an embodiment of a composite transformer according to the present invention, and are a perspective view and an equivalent circuit diagram, respectively. The composite transformer 14 has half-shaped magnetic cores 17, 17'' provided with a plurality of recesses 15, 15'' and 16, 16'', respectively.
A plurality of transformers 18 and 18 are formed by winding wires at a plurality of locations using the recesses 15 and 15'' on the plurality of winding frames obtained by joining the
Each single transformer 19, 20, 21, 22, 23 and 24, 25 is formed, and short circuits formed by copper wire or resistance wire are formed near both ends of the slit 26 obtained by the recesses 16 and 1'. It is formed by penetrating the service wire ring 27. Here, the slit 26 and the shorting coil 27 are provided to prevent waveform distortion, malfunction, etc. that occur due to magnetic influence between the transformers. That is, the magnetic flux 60 shown by the dotted line in FIG. 1 has an air gap created by the slit 26, and the short coil formed by the shorting coil 27 increases the magnetic resistance, and the magnetic flux tends to flow into the adjacent transformer. Each transformer operates as an independent transformer. Here, in order to cut the magnetic flux, it is not necessary to share the slit 26 and the shorting wire 27, and only one of them may be used. A notch may be provided in the transformer.Then, each independent transformer is connected to other circuit components as various transformers constituting a power supply device.

Also, here, the winding to be applied to the winding frame is determined in advance according to the use of the transformer. A specific application example of the composite transformer 28 is shown in FIG. FIG. 2 is a circuit diagram of a switching type power supply device used in a magnetic recording/reproducing device.
In the figure, a line filter 43, a rectifying and smoothing circuit 4-hole switching transformer 46 are connected to an input terminal 42 to which an AC voltage of 100 cm is applied, and a diode 47,
Choke coil 48, electrolytic capacitor 49, resistor 50a
, 50b1 is connected to the DC output terminal 51, further connected to the control circuit 52 as shown in the figure, and its output side is connected to the base of the switching transistor 54 via the driver transformer 53 to take out the first output voltage to the output terminal 51. The rectifying and smoothing circuit 44 is supplied with voltage 12 for the circuit.
It branches from the output of , connects a switching transformer 4'', and further connects a diode 47'', a choke coil 4'', an electrolytic capacitor 49'', resistors 50a'' and 50b'', and a DC output terminal 5'', and then controls as shown in the figure. It is connected to the circuit 52'', and its output side is connected to the base of the switching transformer 5'' via the driver transformer 53'', and the second output voltage is taken out to the output terminal 5'' and supplied as a motor driving voltage of 16V. Here, each transformer shown in FIG. 4 has a coil pair 35 as shown in FIG.
, 36 are line filters 43, 31, 32, 39, 40
are switching transformers 46, 46″, and 33, respectively.
, 34, 37, and 38 are driver transformers 53, respectively.
, 53' and connected to other circuit components. It goes without saying that the composite transformer according to the present invention can be applied not only to the power supply device described above but also to other air conduction circuit devices.

As mentioned above, since the composite transformer of the present invention integrates the magnetic cores of a plurality of single transformers, the overall shape can be made small, so the circuit device can be made compact, and it can be assembled into the circuit device only once. It is relatively easy to manufacture, as the magnetic influence between the transformers can be reduced by simply providing a slot in the magnetic core and adding a shorting wire. Since only one processing is required, it has advantages such as excellent mass productivity.

[Brief explanation of the drawing]

Figures 1A and 1B show examples of the composite transformer according to the present invention, Figure A is a perspective view, Figure B is an equivalent circuit diagram of Figure A, and Figure 2 shows the use of the composite transformer according to the present invention. The circuit diagrams shown in Figures 3A and 3B show a conventional transformer, and Figure A is a perspective view.
Figure B is an equivalent circuit diagram of Figure A. 1, 14...Trans, 3, 18, 20, 22
, 24, 31, 33, 35, 37, 39, primary coil,
4, 19, 21, 23, 25, 32, 34, 36, 38
, 40... Secondary coil, 43... Line filter, 46, 46ζ... Switching transformer, 5
3,53″・・・Transformer for driver, 26・
...Slit, 27...Short wire ring, 15,15''
16,16″...concavity, 17,17″...magnetic core.

Claims (1)

[Claims] 1 A plurality of winding frames are formed by joining half-shaped magnetic cores each having a plurality of recesses, and a plurality of mutually independent transformers are formed by winding the winding frames, and the recesses are used to form a plurality of mutually independent transformers. What is claimed is: 1. A composite transformer comprising: a slit formed therein; and short-circuit wire rings passing through the slit near both ends of the slit.