thyristor power controller
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When it comes to our Thyristor power controller models there are two fundamental ways in which thyristors may be switched to control heating loads, which are whole cycle control and phase angle control. With full cycle thyristor power controller the load current is switched on for complete cycles of the supply, and the average power in the load is controlled by altering the ratio of on and off cycles. This control technique is used in the following generic forms, fast and slow cycle burst fore, single cycle burst fire. With phase angle control the individual cycles of the supply are chopped, and the average power in the load is controlled by varying the angle into each half cycle at which the thyristor is switched on.
The full cycle offers no control over the load voltage or current when the thyristor is on. The load always sees the full supply voltage, and will draw the current defined by Ohm’s law. This thyristor power controller cannot therefore be used in any application which requires current or voltage limitation. Current limit is required with heating elements which have low resistance when cold. The current must be limited until the elements warm up and attain their normal working temperature. Full cycle control minimises radio frequency interference and harmonic generation, and for these reasons is normally preferred over phase angle control in most applications.
With phase angle thyristor power controller devices the individual cycles of the supply are chopped and the average power in the load is controlled by varying the angle into each half cycle at which the thyristor is switched on.
For more information on our thyristor power controller devices you can contact us by telephone or email and one of our helpful and knowledgeable staff will be on hand to answer any questions you have regarding the products and services we provide.