Transformer from DRL. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Transformer from DRL. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Miscellaneous electrical devices

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Once a truck driver lost control and knocked down a street light pole. The repair team replaced the pole and the "head" on it with a DRL lighting lamp. The old one was so mutilated that they did not even take it with them, but threw it nearby. I walked past and, in addition, carried a case with tools. I see a mangled lantern lying, I approached and asked. Everything turned out to be broken, the only exception was the throttle, which had a quite decent appearance. He took out the tool, unscrewed the mounting screws and took the throttle with him. It was released by a German company, the marking on it is 400 watts.

The throttle core, as it seemed at first glance, was W-shaped, the throttle coil was located on the middle core. Thin plates of high-quality transformer steel were fastened together with rivets. I drilled them out, took them out, but the "iron" did not undock until I unwound the throttle winding and sawed the frame. The plates turned out to be smeared on the ends with some kind of varnish; the core had to be washed with a solvent. Now I found that the core plates are solid and have a gap in the middle.

I decided to experiment with the core. With sharp scissors for metal, I made four cuts on each plate (shown in the figure), trying not to deform them. I assembled a new frame from fiberglass plates for the resulting core. Using a simplified formula, I calculated for him the number of turns per volt:

where w1 is the number of turns per 1 V; Sc is the area of the average core core (the width of the plate multiplied by the thickness of the set), see Fig.

I wound the necessary windings and assembled the transformer "overlapping", using cut strips from the plates as trailing ones. The overall power of the transformer turned out to be in the range of 300 ... 350 W, which is sufficient for many applications in the household of a radio amateur.

Transformer from DRL

Since the program for replacing street lighting with LEDs is gradually "untwisted", lamps with DRL lamps will remain "out of work", which means that there will be many such chokes.

Author: V.Besedin, Tyumen

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