Electronic transformer for power supply. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Power Supplies
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The principle of operation of the "classical" transformer is based on the law of electromagnetic induction. In the primary winding, under the action of an applied alternating voltage, a magnetic field arises, creating an alternating magnetic flux in the core, proportional to this voltage, which, in turn, induces an EMF in the secondary windings. This EMF is directly proportional to the number of turns of the windings.
In an electronic transformer (ET), the principle of operation is completely different. In fact, ET is a switching power supply (voltage converter) with electronic protection against short circuit and overheating of elements. The ballasts of energy-saving lamps are similar in principle of operation.
As my experiments have shown, an electronic transformer can be used to power any active load that does not exceed the power parameters of the ET. As a rule, these parameters are indicated on the instrument case. For example, a heating element designed for a voltage of 12 V, with a current consumption of not more than 1,5 A, or a car incandescent lamp with a power of 12 W (as a light signaling device) can be connected to the ET output.
In the pulsed mode, the ET is capable of supplying a load with a power of 24 W (2 of the same type of car lamps).
Given the small size and high efficiency, an electronic transformer is in some cases much more convenient than a conventional one.
Author: A.Kashkarov, St. Petersburg
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