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Summary |
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The WD range is based on more than twenty years experience of the suppression of phase-angle light dimmers, which has made Almag one of the World’s largest manufacturers of dimmer chokes. The range of rise-times and inductances for each current rating allows our WD chokes to cover all dimmer requirements, from EMC compliance right through to high rise-time TV and film studios. All types use powder toroidal cores for optimum high frequency suppression and low flux-leakage. Current Ratings | ||
All current ratings shown are dependant on the actual cooling conditions in the customer’s installation. The powder cores used have a “soft saturation” which means that they do not have the magnetically limited current ratings of laminated chokes. Current ratings are therefore determined mainly by thermal conditions. Normal coolingCurrent ratings are the maximum for efficient natural convection cooling. Reduction of the current by up to 30% to allow for less efficient cooling will have little effect on the rise-time.
Forced cooling Inductance, Resistance & Rise-time | ||
The inductance shown is the nominal value for low drive level, bridge measurement, typically at 1kHz. The resistance shown is for DC measurement at 25 degrees C. The rise-times shown are nominal, from 10% to 90% of the current waveform, at 90 degree firing angle. Preferred Range | ||
This preferred range is based on the most popular choke types and on the most widely used core sizes, and so offers the best combination of price and availability. Other types are available for applications not covered by this preferred range - please contact Almag, and we will be pleased to advise on the most suitable choke type. Specifications and information contained within this data are for guidance only. Whilst every effort has been made to ensure the accuracy of this information, no liability can be accepted for any errors contained herein. In all cases the customer should ensure that the chokes are thermally and electrically suitable for their application. | ||
