CN200979831Y

CN200979831Y - A high frequency transformer

Info

Publication number: CN200979831Y
Application number: CN 200620044649
Authority: CN
Inventors: 张家玺; 张乃铫
Original assignee: Individual
Current assignee: Zhou Yaoda
Priority date: 2006-08-08
Filing date: 2006-08-08
Publication date: 2007-11-21
Anticipated expiration: 2016-08-08

Abstract

The utility model discloses a high-frequency transformer comprising a magnetic body, a primary coil and a secondary coil, wherein, the magnetic body comprises a magnetic core and a magnet yoke, the magnetic core is of a collar plate shape and provided with a raised cylinder in the center, the edge of the magnetic core and the raised cylinder are formed into a ring beard, a line outlet is provided on the magnetic core, the magnet yoke is of a thin disk type and tight fitted on the magnetic core, the primary coil and the secondary coil are coiling and laminated in a helical coil with the center of raised cylinder in the magnetic core, layers in primary coil are concatenated end to end, layers in secondary coil are also concatenated end to end, the primary coil and the secondary coil are rudimental embedding in the magnetic body of the transformer, the'magnetic circuit encompass electric circuit' can be realized, the magnetic leakage can be rudimental avoided, the magnetic field can be thorough used, the transformer has the advantages of high conversion efficiency, small volume and lower cost.

Description

High frequency transformer

Technical field

The utility model relates to the transformer in the small-sized DC power supply, more specifically refers to a kind of high frequency transformer that portable computer or flat LCD power supply use that is used for.

Background technology

According to Faraday's electromagnetic induction law as can be known, in alternating current circuit, the magnetic line of force is time dependent, and therefore, the height of voltage and the size of electric current also can change thereupon, and people have made various forms of transformers according to this principle.

The core structure of traditional transformer is substantially: " E " type, " C " type or " O " type structure, owing to employing between these magnetic cores and the coil is the structure of " circuit encirclement magnetic circuit ", the part magnetic field of coil both sides can not be fully utilized, therefore, magnetic flux leakage is bigger, causes the efficient of transformer low, volume is big, cost is high.

At present, be widely used in the power supply adaptor in the LCD, the power supply adaptor of portable computer and the high frequency transformer of all kinds of small chargers, its structure is seen Fig. 1-shown in Figure 4, also there is the ubiquitous shortcoming of most of transformers in this class transformer, 1, because a big chunk in the coil is not all coated by magnetic core, exposed outside, thereby have that leakage field is big, conversion efficiency and coupling efficiency is low, the shortcoming of interference free performance difference.2, because coil adopts the mode of traditional coiling, promptly primary coil and secondary coil are wound in the structure on the magnetic core continuously, and primary coil is interior, secondary coil structure outside.Thereby the magnetic core of the transformer of this class power supply, charger or adapter must design more greatly, elementary and secondary coil coiling gets the longer needs that satisfy power supply, therefore, the volume of transformer is done greatlyyer, this class power supply often have to design separately outside main frame, can not be designed in LCD or the notebook computer, also bring inconvenience in the use.Therefore, above-mentioned transformer needs further improvement.

The utility model content

The purpose of this utility model is the above-mentioned shortcoming that exists at traditional transformer, and the slim high frequency transformer that a kind of leakage field is few, coupling efficiency is high, volume is little is provided.

To achieve these goals, the utility model adopts following technical scheme:

This high frequency transformer comprises magnet, primary coil, secondary coil,

Described magnet comprises magnetic core, yoke, and magnetic core is a discoid and middle part convex cylindrical, and the edge of magnetic core and convex cylindrical form annular groove, offer the lead-out wire opening on the magnetic core, and yoke is a slim disk shape and closely is covered on the magnetic core;

Described primary coil and secondary coil are center and with spiral coil coiling and folded mutually layer by layer with the convex cylindrical of magnetic core all, and head and the tail serial connection mutually also is connected in series between each of secondary coil layer from beginning to end mutually between each of primary coil layer.

In the annular groove that is laminated in magnetic core, described primary coil is divided into up and down two parts to described secondary coil along core axis, all along core axis in the annular groove that is stacked and placed on magnetic core, secondary coil is at up and down between two parts of primary coil.

All be stacked with heat insulating lamella between the layer of described primary coil and the layer,

All be stacked with heat insulating lamella between the layer of described secondary coil and the layer.

Be stacked with heat insulating lamella between described primary coil and the secondary coil.

Because the magnet of high frequency transformer of the present utility model has comprised magnetic core, yoke, magnetic core is a discoid and middle part convex cylindrical, the edge of magnetic core and convex cylindrical form annular groove, offer the lead-out wire opening on the magnetic core, yoke is a slim disk shape and closely is covered on the magnetic core, is center and also folded mutually layer by layer with the spiral coil coiling with the convex cylindrical of magnetic core with primary coil all with secondary coil, head and the tail serial connection mutually between each of primary coil layer, between each of secondary coil layer also head and the tail be connected in series mutually.The magnet of this transformer can be coated on primary coil and secondary coil in the magnet basically, accomplished " magnetic circuit encirclement circuit ", basically the leakage field phenomenon can not occur, magnetic field energy is fully utilized, and transformer has conversion efficiency height, volume is little, cost is low advantage.

Description of drawings

Fig. 1 is the E type core structure schematic diagram of traditional transformer.

Fig. 2 is the transformer device structure schematic diagram that utilizes magnetic core shown in Figure 1 to form.

Fig. 3 is the core structure schematic diagram of the traditional transformer of another kind.

Fig. 4 is the transformer device structure schematic diagram that utilizes the composition of magnetic core shown in Figure 3.

Fig. 5 analyses and observe enlarged diagram for transformer device structure of the present utility model.

Fig. 6-Fig. 8 is respectively yoke, magnetic core, the loop construction schematic diagram of transformer of the present utility model.

Embodiment

See also shown in Figure 5ly, high frequency transformer of the present utility model comprises magnet 11, primary coil 12, secondary coil 13.

Simultaneously in conjunction with shown in Fig. 6-8, described magnet 11 comprises magnetic core 111, yoke 112, magnetic core 111 is a discoid and middle part convex cylindrical 114, the edge 115 of magnetic core 11 forms annular groove 116 with convex cylindrical 114, offer lead-out wire opening 117 on the magnetic core 111, magnetic core edge 115 lead-out wire openings 117 are convenient to the outlet of primary coil 12 and secondary coil 13.

Yoke 112 is a slim disk shape and closely is covered on the magnetic core 111, has constituted a complete magnetic loop.

Described primary coil 12 is center and also folded mutually layer by layer with the spiral coil coiling with the convex cylindrical 114 of magnetic core 111 all with secondary coil 13, primary coil 12 and secondary coil 13 all are snail type structure, head and the tail are connected in series mutually between each layer of primary coil 12, also are connected in series mutually from beginning to end between each layer of secondary coil 13.

The planar spiral coiling mode of primary coil 12 and secondary coil 13 and the shape of coiling, as the shape of discoid mosquito-repellent incense used in the daily life, and folding mutually of primary coil 12 and secondary coil 13 is folded mutually as several discoid mosquito-repellent incenses.

Described primary coil 12 is all folded mutually in the annular groove 116 of magnetic core with secondary coil 13, secondary coil 13 along core axis in the annular groove 116 that is laminated in magnetic core, described primary coil 12 is divided into two parts up and down, all along core axis in the annular groove 116 that is stacked and placed on magnetic core, secondary coil 13 is at up and down between two parts of primary coil 12.

All be stacked with heat insulating lamella between the layer of described primary coil 12 and the layer,

All be stacked with heat insulating lamella between the layer of described secondary coil 13 and the layer.

Be stacked with heat insulating lamella between described primary coil 12 and the secondary coil 13.

Above-mentioned heat insulating lamella indicating in the drawings illustrates, and being provided with of it can be played the effect that prevents high voltage flash and reduce distributed electrical capacity, reduction Potential distribution.

From above-mentioned description as can be known, the shortcoming that traditional high frequency transformer that transformer of the present utility model overcomes exists has the following advantages:

1, in the magnet because of primary coil and secondary coil base closed, reduced the free of the magnetic line of force, improved electromagnetic conversion efficient;

2, since this magnet structure in the form of annular discs, magnetic line of force distribution uniform;

3, adopt the primary coil of snail type and the winding structure of secondary coil, make that the height of transformer magnetic is littler, transformer is slimming and more miniaturization more;

4, owing to be that snail molded lines coil structures makes the coupling efficiency between the primary and secondary coil better;

5, owing to adopted the winding structure of planar spiral coil, reduced the distributed capacitance and the power consumption of coil.

Transformer of the present utility model no matter at product weight, overall dimension, volume, or on the whole height of product, carrying load ability, all can surpass similar transformer performance, compares with the performance of certain a similar transformer below, specifically can see the following form:

	SONY	Transformer of the present utility model
	SONY	Transformer of the present utility model	Weight	42 grams	31 grams
Size	30mm20mm18mm	34mm*10mm	Weight	42 grams	31 grams
Size	30mm20mm18mm	34mm*10mm	Volume	10800mm	9075mm
Highly	18mm	10mm	Volume	10800mm	9075mm
Highly	18mm	10mm	Performance	Power: with load current under the voltage is 3.4-3.75A	Power: with load current under the voltage is 3.5-4.5A

Adopt the volume of DC power supply that transformer of the present utility model makes, power supply adaptor, charger will be littler, for LCD, the portable computer of making the little integrative-structure of volume have been opened up good space.

Claims

1. a high frequency transformer comprises magnet, primary coil, secondary coil,

It is characterized in that:

2. high frequency transformer as claimed in claim 1,

It is characterized in that:

3. high frequency transformer as claimed in claim 2,

It is characterized in that;

4. high frequency transformer as claimed in claim 3,

It is characterized in that;