Halogen incandescent lamps. Power supply on the chip TDA4605. Scheme, description

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Halogen incandescent lamps. Power supply on the chip TDA4605. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Halogen lamps

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On fig. 5.16 shows a power supply circuit implemented on an available chip TDA4605. This microcircuit has domestic counterparts K1033EU5, KR1087EU1.

Halogen incandescent lamps. Power supply on the chip TDA4605
Rice. 5.16. Schematic diagram of the power supply for GLN on TDA4605

Transformer T1 is wound on a Sh16x20 core made of ferrite 2500NMS1. The value of the non-magnetic gap is 0,12 mm (taking into account the double gap, i.e. two gaskets of 0,12 mm each). The number of turns of the primary winding W1 = 64, wire diameter 0,25 mm. The number of turns of the secondary winding W2 = 3, wire diameter (bundle of five cores 0,6 mm). The number of turns of the feedback winding W3 = 3, wire diameter 0,25 mm.

Most electronic transformers have restrictions not only on the maximum, but also on the minimum total power of the connected lamps. This is due to the peculiarities of the operation of internal converters. The permissible power range is indicated in the catalog and on the device case, for example, 35-105 W. This limitation, however, does not mean the danger of the transformer failing in the absence of load (for example, if all the lamps burn out). It only follows from it that the normal operation of lamps with a power less than permissible is not guaranteed.

For the convenience of connecting lamps, electronic transformers usually have several pairs of output terminals.

Lamp power control, depending on the specific circuit implementation, is carried out in one of two ways:

switching on a transformer with a traditional dimmer;
by applying a special signal to its separate control input (as is the case with adjustable electronic ballasts).

This possibility may or may not be provided at all. When connecting an electronic transformer to a conventional dimmer it is important to make surethat the latter allows operation with capacitive loads. Such information is contained in the documentation for the dimmer.

It should be noted that the secondary voltage on their windings is deliberately somewhat reduced compared to the nominal one, and usually amounts to 11,2-11,6 V. This technique somewhat reduces the luminous flux and light output of the lamps, but prolongs their service life.

Author: Koryakin-Chernyak S.L.

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