Halogen incandescent lamps. Advantages of electronic transformers. Scheme, description

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Halogen incandescent lamps. Advantages of electronic transformers. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Halogen lamps

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A significant disadvantage of electromagnetic transformers is their large mass, which is approximately proportional to their power. For example, a 300 W transformer can weigh up to 10 kg! With a large number of halogen lamps, the total weight of such equipment may exceed all reasonable limits.

The problem of large size and weight is solved in the so-called electronic transformers, which, according to a stricter classification, are electronic power supplies. These devices contain a converter that increases the frequency of the supply voltage up to 30000-10000 Hz, due to which the size of the transformer as such can be significantly reduced.

Important to notethat the cross section of the wire of the secondary winding should also be large in this case. The converter and the corresponding small-sized transformer (with a diameter of no more than 20 mm) are placed in a common, usually plastic, case (Fig. 5.12, Fig. 5.13).

Halogen incandescent lamps. Advantages of electronic transformers
Rice. 5.12. Appearance of a rectangular electronic transformer for powering the GLN

Halogen incandescent lamps. Advantages of electronic transformers
Rice. 5.13. Appearance of a round-shaped electronic transformer for powering the GLN

The mass of electronic transformers is small, and their size increases slightly with increasing power. In addition, they emit much less heat and do not make a sound during operation. Due to these features, they are the only viable option for switching lamps with a total power of 100 W or more. Models with power up to 1500 W are currently being developed.

Halogen incandescent lamps. Advantages of electronic transformers
Rice. 5.14. Appearance of the electronic transformer on IR2161

One of the options for an electronic transformer implemented on a specialized IR2161 chip is shown in fig. 5.14 (without plastic housing). The circuit diagram of this device is shown in fig. 5.15.

Denominations and type of elements used are given in table. 5.1.

Table 5.1. Denominations and types of elements used in the circuit (Fig. 5.15)

Halogen incandescent lamps. Advantages of electronic transformers

Halogen incandescent lamps. Advantages of electronic transformers
Rice. 5.15. Schematic diagram of an electronic transformer on ICIR2161

Author: Koryakin-Chernyak S.L.

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