Ferrite Cores

The EP/LP core range was specially
designed for wideband transformer
applications where low build height is a
must. The board area occupied by the
assembly is almost a square, allowing
high packing densities on the PCB.
The bobbins have two rows of pins
allowing easy design of multiple output
transformers.
Cores are available in high permeability
materials, including the new low
THD material 3E55, for wide band
transformers and in power materials for
small power transformers.

Toroids have the best possible shape from the magnetic point of view. The flux path is completely closed so the capabilities of the ferrite are fully exploited. Especially for high permeability ferrites
the effect of even a minor airgap in the magnetic circuit
can spoil up to 50% of the effective permeability. A further
advantage is the very low leakage fi eld which makes it a
suitable shape for power and pulse transformers.
Ring cores are mainly used for pulse- and wide band transformers and interference suppression coils but also in
special power supplies.

We have passed ISO9001:2015,CE,SGS approval and IEC report

PQ type Transformer Parameters

Brand Name; GREWIN Transformer Core structure;
Laminated
Coil number; Autotransformer
Place of Origin; China Coil Material; ferrite Coil structure; toroidal
Usage; High Frequency Model : PQ Phase; single
Application; High-frequency switching power supply and High-frequency inverter power transformer. PBX
Deliver time; Within 15 working days Package; Customized standard cartons or export standard carton with strong pallets
ATTENTION; YOU CAN CUSTOMIZED ALL SERIERS ACCORDING TO YOUR REQUERMENT

1).Features:
Has a strong anti-interference, distributed capacitance, impedance, attenuation of low transmission, firm
structure,can fine-tune the inductance, etc., are widely used in fax
machines, PBX.

2). Applicable frequency range: 20 to 100kHz :
Operating frequency: higher than 200kHz
High magnetic flux and low loss magnetic materials
With low leakage inductance and high efficiency .

3).Applications:
PCB circuits, computer, TV, monitor, scanner, duplicator, mobile adapters, printer and other equipments and instruments.
UL insulation system for Class B (130), F (155), H (180)

4). Can make other customized Ferrite transformers:
Power range: core type using N67 grade material
500: ETD54, ETD59 and E65

5)Advantage:
1.UL, CUL, CE, ISO9001:2015
2.We offer custom-made transformers, OEM and ODM are welcome
3.We deliver the quality you expect at consistently competitive prices
4.Transformer quality lifetime:10 Years.
5.Specialty Sales service:5 -10 Years
6.Transformers Test: 100% test before the shipment

PM cores are a variation on classic P cores, suitable for large high power transformers and energy storage chokes. They have larger wire slots facilitating easy assembly, but still the good shielding of a closed core shape.
PM cores can be found in transmission and radar equipment and in various high power industrial installations.

RM cores were designed for use in high Q, high stability fi lter inductors.
Their shape allows economic utilization of surface area on the PCB. The range is standardized in IEC 431 and is available worldwide from many suppliers. The sizes are based on the standard PCB grid distance. RM 5, for instance, fi ts on a board space of 5 x 5 modules of 2.5 mm grid. Coil formers and clips were optimized for automated winding and mounting.
The slots provide suffi cient space for leads of windings. Magnetic shielding is not as good as with P-cores, but still
effective.

The shape of EI cores, more precisely a core set consisting of an E core and an I core, is magnetically equivalent to an E core set with shorter legs. For typical characteristics, see therefore the E core section.

A disadvantage of the classical P core design has always been the narrow wire slots, making it diffi cult to make strong coil formers with integrated solder pins.
In the PTS design this problem is solved by cutting away the sides of both core halves. This creates ample room for wires and coil former fl anges.

A range of special PTS coil formers is available but also most standard P core accessories can be used.

U cores, with rectangular crosssections, are easy to produce and are relatively inexpensive. For this reason they are very popular in low cost applications such as interference fi lters and output chokes in radio and TV equipment. There is no real optimization for transformer winding designs and the core is rather bulky.
Large U cores like U93 and U100 are suitable for very high throughput powers. They can be stacked to form transformers, capable of handling several kW's in applications such as
industrial HF welding.

The ER core design is derived from the original E core and, like
ETD and EC cores, has a round centre pole and outer legs with a
radius to accomodate round coil formers.
These cores are mainly used for power transformers. The round
centre pole allows the use of thicker wires while the shorter turn
length keeps the copper losses low.