Planar Transformers

PLANAR TRANSFORMERS OF TANGSHAN CREATIVEMIX

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One, classification and characteristics of the planar transformer

Generally divided into 4kinds: the first kind is flat, ferrite cores, the traditional winding winding structure, mainly some high-frequency, high-voltage power transformer, and the traditional transformer ratio of little advantage; second is the plate ferrite core, copper foil type winding structure, mainly used in the output low voltage large current high frequency, high power switching power supply module; third is the plate ferrite core, PCB PCB winding, mainly some high frequency, medium and small power transformer; the fourth is the use of LTCC ( low temperature co-fired ceramic ) process, in the ferrite sheet printed winding, forming a winding array, multilayer bonding superposition, co-firing into one, is mainly in the high frequency small signal circuit signal broadband transmission, isolation effect.

The main characteristics of planar transformer:

The 1product is in a flat plate shape, small volume, small thickness, consistent with the power supply module development trend;

2 the structure is simple, planar transformer is composed of a small number of components and the least winding, this module in automatic assembly, especially for.

3high frequency, large power density: the traditional transformer in high frequency switch loss increases and that will make the transformer overheat. Planar transformer, so that these problems can be solved. The planar transformer can design for the high frequency transformer, provides an economical and good transformer module. It can work in100kHz ~ 1000kHz. Since planar transformers element size is very small, it has excellent temperature dissipation characteristics, so it can be and is related to the semiconductor device and the inductance of closely packed together, achieve high power density.

4: regulation of leakage inductance of high work efficiency, so that it can have a very fast switching time, very low cross loss, can enable it to achieve high efficiency. The secondary winding of the transformer and the primary winding between the turn-to-turn conduction loss is very small.

5excellent heat dissipation characteristics: planar transformer with high surface area to volume ratio, a short heat channel of small components. Conducive to heat dissipation. Raw edge and side edge between the winding inter-turn loss is very small. The core characteristic of the geometry can effectively reduce core losses. So it can achieve a high magnetic flux density. It can be - 55~ 130degrees in between jobs.

6 electromagnetic radiation interference: winding and winding between the good coupling, can make the winding leakage are kept to a minimum. Output end to auxiliary components connection is very short and tight assembly, so the two windings on the line between the leakage inductance is minimized, thus the electromagnetic radiation interference.

7high reliability;

The 8 insulating high strength

In two, the overseas development condition

In foreign countries this four planar transformer have been successfully trial-produced, but only for some famous enterprises abroad, such as Magnetics company in the past two years, introduced the first power planar transformer with magnetic core and gradually been applied; the United States of America Flat Transformer Technology and PAYTON ( Payton ) company realized by means of the former three planar transformer production, PAYTON plane power transformer products from a full range of 5W-20KW products. Taiwans Pulse only three small power planar transformer production, currently in the two communication power supply module for DC-DC products are widely used, and produced the following 300W series is full; the United States of America Midcom, Inc company was achieved using fourth planar transformer production.

In three, the domestic development status

Application: at home in the communications industry two power ( low DC-DC ) have started to use high-frequency power planar transformer, but the power is below 600W, widely is the brick 300W and half brick and 150W products, switching power supply frequency at about200kHz-300kHz,500kHz-1MHz is the development trend of high frequency and high power density products, such products can only be applied to planar transformer. In power industry leader in communications industry at a time of power supply, still adopt the traditional transformer, frequency below 100kHz, such as 48V50A power transformer, the volume of about 60x 80x 60, the power density of about 10W / cm3, high-frequency power planar transformer power density in the same the working frequency and the volume is about3~ 5 times of the traditional transformer, that is to say the same power transformer using planar transformer type structure, the volume of the transformer can be reduced to the original 1 /3~ 1 /5

At present, the power is more than 600W, frequency greater than 100kHz power planar transformer in the few domestic mass production application. But with the development of power supply technology needs, especially in communication power supply, electroplating power supply, inverter power source are applied, but because of the high cost of limit is mostly applied in military electronic and high-end industrial products, but this kind of transformer are the domestic industrys attention.

The other in automotive electronics, planar transformer, inductor in foreign products have high volume applications, such as car type HID ( Hella, Panasonic, Hitachi, Mitsubishi and other automotive headlight stabilizer ) application is planar transformer and surface mount type inductor products. With the automobile electronic product miniaturization, high power trends electronic products, using the planar inductor, transformer is an inevitable trend of development.

Domestic production of planar transformer manufacturers are mostly concentrated in Shenzhen, and manufacturers are not many, such as the Shenzhen Beijing sinter, sea light, Bodo, there is the899factory in Sichuan, have already formed batch, production of many products mature large quantities of all brick, half brick DC-DC power modules with planar transformer, inductor product. These enterprises are the advantages: Shenzhen enterprises is a high-volume, low cost production of common varieties of planar transformer;899with its own production of magnetic material advantages, at home would be the most successful planar transformer products business, is also more ZTE, Huawei and other domestic suppliers of large enterprises.

In four, my company products

In Beijing as the center of the northern transformer enterprises currently form the mass production of planar transformer, inductor enterprises, as far as we know, TANGSHAN CREATIVEMIX an enterprise.

My company pay more attention to all kinds of planar transformer, inductor product technology development, according to customer demand for supporting the development, the main products are two communication power supply DC-DC50W,100W,150W,300W,600W and other products, the switching frequency is200kHz-300kHz,500kHz products have also begun to application,1MHz working frequency product is being developed, the series has comparison of total ( available from the import filter, surface mount current transformer, planar transformer, output filter planar inductor, the other output filter surface mount inductor package of power needed for inductive devices products. ). A power supply products currently has AC-DC,1000W,1500W-2000W,3000W,5000W products, due to switching power supply by other device switching frequency limitations, mainly to 100kHz or so, due to the cost factor in military power products used.

In radar transmitter products in the high voltage power supply ( output voltage in2000V,4000V,6000V in multiplex output ) planar transformer, inductor is the optimal choice, at present this kind of high voltage planar transformer inductors products, I mainly with military units for EW class military power of radar transmitter high voltage planar power developed. This kind of product with high output voltage, high frequency of distribution parameter requirements of high technology, so the difficulty is large. Now civil and industrial market is still not widely.

The United States of America PULSE series of planar transformer, inductor series products, our company has developed a substitute products, performance, prices have great advantages; for POWERONE power modules with planar transformer, I also have substitute products. Widely in Japan LAMDA module, such as DC-DC600W,280V-28V module with planar transformers, inductors, AC-DC 800W220V-28V power modules with planar transformers, inductors, filter inductors for EMI, APFC, a driver transformer, current transformer.