JPS6154607A - Transformer - Google Patents

Abstract

PURPOSE:To facilitate the automatic assembling of the title transformer by a method wherein, when the transformer is formed by alternately laminating the primary and the secondary windings which are divided into a plurality of parts on the main magnetic path, the primary winding is composed of a plurality of unit windings and the secondary winding is composed of a plurality of unit coils consisting of spiral printed coils provided on an insulated substrate. CONSTITUTION:The core 1 of a transformer is composed of an E-type core 1a, an I- type core 1c, to be turned to a main magnetic path, located in the center and an I-type core 1b to be used to complete a magnetic path. A plurality of the primary windings 2 and a plurality of secondary windings 3 are alternately stacked on the outer circumference of the I-type core 1c, and an annular insulated plate 8 is provided on the prescribed part. According to this constitution, the winding 2 is constituted by a unit winding on which a lead wire is wound around, but the winding 3 is constituted by a unit printed coil. At this point, the winding 3 forms a spiral conductor 5 on an insulated substrate 4 by printing, and both ends of said conductor 5 are connected to the lead out wire 7 fixed on the substrate 4 through the intermediary of a jumper wire 6. Also, a lead out wire 9 is led out on the winding 2 and, at the same time, the lead out wire 7 and 9 are concentrated on one side only, and they are connected to a printed circuit board 10.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a transformer used for supplying power to an IC circuit.

Conventional configurations and their problems A switching power supply is usually used as a power supply for an IC circuit, and a converter or an inverter transformer is always used in the power supply circuit. This inverter transformer has a base winding in addition to the primary winding and the secondary @ wire, and when the power source becomes a multi-output power supply, the number of secondary windings increases according to the number of outputs. FIG. 4 is a cross-sectional view of one example of such a transformer, in which 21 is a magnetic core, 22 is a bobbin, 23 is a primary winding wound in sections, 24 is a space-wound secondary winding, and 25 is a This is an insulating film for insulating between the windings and between the windings and the magnetic core. In such transformers, the switching frequency ranges from several 10 KHz to several 100 KHz, so leakage and leakage inductance between the primary and secondary windings are a problem.In order to reduce this, the primary winding The secondary winding is divided into two parts, or the winding is performed with special care in order to minimize variations in winding width. This is especially important when there are only a few turns, such as in the case of a secondary winding. For this reason, there are problems in that it is impossible to mechanize, becomes expensive, and has large variations in characteristics.

OBJECTS OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and provide a transformer in which winding and assembly operations can be easily mechanized and leakage inductance has less variation.

Structure of the Invention The present invention divides a primary winding and a secondary winding into a plurality of unit windings in the direction perpendicular to the main magnetic path, and connects each divided unit winding on the primary side with a conductor. Each divided unit winding on the secondary side is composed of a printed coil in which a conductor is spirally provided on an insulating substrate, and one of these
Each unit winding of the secondary winding and each lead-out wire of each unit printed coil of the secondary side are pulled out in the same direction to form a transformer, and when this transformer is installed on another printed circuit board for mounting the transformer, each The lead-out wires are soldered to the copper foil of the printed circuit board, and each unit winding and each unit printed coil are connected in series or in parallel to obtain a required voltage or current value.

DESCRIPTION OF THE EMBODIMENTS FIG. 1 shows an exploded perspective view of an embodiment of the transformer of the present invention. In the figure, numeral 1 denotes a magnetic core consisting of an E-type iron core 1a and an I-type iron core ib, and numeral 2 denotes each divided unit winding on the primary side, each of which is composed of a winding in which a conducting wire is wound. 3 is each unit printed coil constituting the divided secondary winding, and as shown in FIG. 2, a conductor 5 is formed in a spiral shape on an insulating substrate 4.
Both ends thereof are connected via jumper wires 6 to lead-out wires 7 fixed to an insulating substrate. 8 is an insulating plate.

These magnetic cores l, a plurality of primary side unit windings 2, a plurality of (
The 8-unit printed coil 3 and insulating plate 8 of i are installed between the primary unit winding 2 and the secondary unit printed coil in the direction of the main magnetic path lc of the E-shaped magnetic core 1a, as shown in FIG. The transformer is assembled by stacking the insulating plates 8 in between and pulling out the lead wire 9 of the primary unit winding 2 and the lead wire 7 of each unit printed coil 3 in the same direction.

When connecting the transformer assembled as described above to an IC circuit or the like, as shown in FIG. Insert the lead wires 7 of each unit printed coil 3 on the secondary side, solder them to the copper foil 12 of the printed circuit board 10, and connect each unit winding and unit printed coil in parallel or series to obtain the required rating. voltage or current.

Effects of the Invention As explained in the above embodiments, the transformer of the present invention has the following advantages: 1. Both the primary winding and the secondary winding are composed of a plurality of independent unit windings or unit printed coils. , it is possible to automate the winding, and even during assembly work, 1
Since the next-side unit winding 2 and the secondary-side unit printed coil 3 can be stacked alternately with the insulating plate 8 in between, the assembly can be easily automated.

2. Also, as a structural feature, a transformer with any specifications can be obtained by connecting each unit winding or each unit printed coil in series or parallel for the primary winding and secondary winding. Therefore, it is possible to deal with diversification of transformer specifications, and it is easy to standardize unit windings and unit printed coils.

3. Also, as a characteristic feature, since the secondary side is composed of a printed coil, the positional deviation of the winding is very small, and therefore the variation in leakage inductance can be made very small.

Industrial effects such as these can be obtained.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of one embodiment of the transformer of the present invention, FIG. 2 is a top view of a printed coil constituting the secondary winding of the transformer, FIG. 3 is a perspective view of the assembled transformer, and FIG.
The figure is a sectional view of a conventional transformer. l...Magnetic core 2...Primary side unit winding 3...
Secondary side unit printed coil 7...Secondary side lead wire 8
... Insulating plate 9 ... Primary side lead-out wire 10 ... Printed circuit board for mounting transformer 12 ... Name of copper foil agent Patent attorney Etsuji Yoshizaki Figure 1 Figure 2 Figure 1 56゜01 Sagiia Figure 3 Figure 4

Claims (1)

[Claims] In a transformer configured with a plurality of windings in which the primary winding and the secondary winding are divided in the direction perpendicular to the main magnetic path,
The primary winding is constituted by a plurality of unit windings in which a conducting wire is wound, and the secondary winding is constituted by a plurality of unit printed coils in which a conductor is spirally provided on an insulating substrate, and one of these A transformer characterized in that the lead-out wires of each unit winding of the secondary winding and each unit printed coil of the secondary winding are drawn out in the same direction.