Toy transformer

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An old toy transformer from Piko
Symbols according to IEC 60417: Transformers for toys

A toy transformer is a safety transformer which is intended for the power supply of toys or all other systems that do not meet the installation regulations for low-voltage systems (see electrical installation ). If necessary, a rectifier is also installed in a bridge circuit .

Toy transformers may be manufactured for a maximum power of 200 VA and a maximum output voltage of AC 24 V or DC 33 V. Furthermore, the maximum permissible output current must not exceed 10 A. The output voltage depends on the manufacturer and is usually 12 V DC , or 16 V AC for Märklin products .

Toy transformers are available with a fixed output voltage for lighting and solenoid items or an adjustable output voltage for speed-controlled motors. The adjustability is achieved in simple designs by a sliding contact on the secondary winding of the transformer, or by an adjustable electronic voltage control .

The short-circuit resistance is ensured for small powers (e.g. 15 VA) by the choice of the air gap (as with the bell transformer ), for larger ones by temperature monitoring in the device.

Individual evidence

  1. ↑ DIN EN 61558-2-7; VDE 0570-2-7 : Safety of transformers, power supply units, chokes and the like - Part 2-7: Special requirements and tests for transformers and power supply units for toys
  2. ^ Hermann Wellers: Specialized examination in electrical engineering and energy engineering . 2nd revised edition, Verlag W. Giradet, Essen 1981, ISBN 3-7736-2791-2

Norms

  • Voltage category and protection class to be used for model railways. Published in NEM 609 (standards of European model railways) edition 2010 (replaces edition 2000). Online (PDF; 154 kB)
  • Electric toys - safety according to EN 62115
  • Safety of electrical devices for household use and similar purposes according to EN 60335-1
  • Safety transformer according to DIN VDE 0570-2-6 or EN 61558-2-6
  • Symbols for transformers according to IEC / DIN EN61558, see toy transformer

literature

  • Gerhard Kiefer: VDE 0100 and practice . 12th edition. VDE-Verlag, Berlin and Offenbach 2006, ISBN 3-8007-2867-2 .