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INTRODUCTION
This document presents a short survey of FERROPERM's inductive products. It is intended to be a general introduction and update on our manufacturing and design capabilities; the scope of which is constantly widening due to our commitment to research and development.
Detailed data is available for download or in hard copy from our sales outlets for all our standard product ranges.
FERROPERM offers a manufacturing capability for the production of most types of high quality inductors and transformers, including surface mounting types. Toroidal types and wave-wound types are particular specialities.
Transformers are all produced as custom designs. Inductors are produced as custom designs and in standard ranges which are sumarised in this document.
A highly flexible production facility ensures short lead times on custom designs as well as standard products. We can produce designs for your applications or we can manufacture to your own designs.
Rather than trying to list all the types of inductors and transformers FERROPERM can produce, it is easier to list types not made:
1. ``Mains'' (50 or 60Hz) power transformers.
2. Inductors and transformers with any dimension larger than about 300 mm.
CONTENTS
SUMMARY OF STANDARD INDUCTORS
INTERFERENCE SUPPRESSION CHOKES: ROD TYPE
These are ferrite-cored inductors with values from 1uH to 4mH and current ratings from 0.5A to 10A. Available in sleeved or lacquered styles, they offer high volumetric efficiency. Applications include use with motors, switched-mode power supplies and thyristor controllers.
INTERFERENCE SUPPRESSION CHOKES: TOROIDAL TYPE
This type of suppression choke is becoming increasingly popular due to its closed magnetic circuit. We offer an individual design service to suit customers specific requirements. Single and common mode styles are available with up to 20A rating.
R.F.CHOKES
Standard, miniature and subminiature types are available in moulded, sleeved or lacquered styles. Values are from .1uH to 22mH. Current ratings are from .1A to 3A with high Q at frequencies up to VHF.
TOROIDAL & ROD INDUCTORS
Toroids offer the benefits of a closed magnetic circuit and small physical size. Rods offer the advantage of low cost. We offer an individual design service to suit customers' specific requirements. Applications include use as r.f. chokes, baluns, rod aerials, signal transformers and energy storage chokes in switched-mode power supplies. Wire ended, P.C.B. mounting and surface-mounting styles are available.
TRANSFORMERS
These are custom made to meet each customer's requirement, be it 1 off or 100k. Most popular formats are available, including surface mount. In addition, FERROPERM specialises in high-voltage, wave-wound constructions. Some applications are switch mode power supplies, data/signal isolation and RF circuitry.
CUSTOM INDUCTORS - WHAT INFORMATION IS NEEDED.
If you would like us to design inductors to meet your requirements, please send us the following information. If you do not have all the information available, please just give what you can.
1. Specify the application. (For example, Energy Storage Choke for
a Switched Mode Power Supply). Please give as much information as you can.
2. Specify the maximum dimensions of the space you have available for the inductor.
3. Specify if you require surface mounting or through-hole mounting.
4. If you have a preference for a particular hardware design (for example rod or toroidal), please state it.
5. Specify your estimated requirements of quantities and delivery dates both for short term and long term. This is important because it may influence what hardware is specified for the design.
6. If you have a target or maximum price level, please state it.
7. Specify maximum average direct current flow.
8. Specify maximum peak current flow.
9. Sketch or describe any alternating current waveform (other than interference current). If the waveform is variable, please specify the extremes.
FOR ENERGY STORAGE CHOKES (INDUCTORS):
10. Specify inductance and widest acceptable tolerance at near zero current, at maximum average current and at maximum peak current.
FOR ALL OTHER INDUCTORS:
10. EITHER specify inductance and widest acceptable tolerance
OR specify minimum required impedance at particular frequencies or sketch a graph of minimum required impedance versus frequency.
11. Specify if common mode (current compensated) design is required. (Examples of common mode chokes are shown on page 12.)
12. Specify maximum working voltage between windings if common mode.
13. If this working voltage is a.c., please specify the frequency.
CUSTOM TRANSFORMERS - WHAT INFORMATION IS NEEDED.
If you already have transformer designs, we will be pleased to quote for their manufacture. Just send us your drawings!
If you would like us to design transformers to meet your requirements, please send us the following information. If you do not have all the information available, please just give what you can.
1. Specify the application. (For example, Switched Mode Power Supply (SMPS) in an instrument). Please give as much information as you can.
2. Indicate by a schematic or describe how the transformer is driven and used. (For example, push-pull FET drive in a SMPS). Please give as much information as you can.
3. Draw a schematic of all windings with turns ratios and widest acceptable tolerance of turns ratios. Indicate polarity of windings where it is important. For windings with one or more taps between the ends, please make clear what turns ratios are required for each section of the winding!
4. Specify what voltage isolation requirements there are between all windings.
5. Draw or describe the voltage waveform which will be applied to the primary winding. If the waveform is variable, please specify the extremes.
6. Specify maximum working currents to be drawn from all secondary windings.
7. If occasional overload conditions have to be met, please specify these seperately.
8. Specify the maximum dimensions of the space you have available for the transformer.
9. Specify if you require surface mounting or through-hole mounting.
10. If you have a preference for a particular hardware design (for example ETD, RM or toroidal), please state it.
11. Specify your estimated requirements of quantities and delivery dates both for short term and long term. This is important because it may influence what hardware is specified for the design.
12. If you have a target or maximum price level, please state it.