These toroidal transformers are also molded in white plastic cups for simple and inconspicuous ceiling mounting. Temperature and overload fuses can be integrated. They provide 11.5 V for halogen lamps on the secondary side.
Often, several windings are available, so that different voltages can be removed from a transformer on the secondary side and the transformer can be operated on networks with 115 and 230 volts on the primary side.įor low-voltage lighting purposes, transformers with a winding ratio of 20:1 (with 230 V mains voltage) are used. Transformers with factors of 2:1 or 1:2 adapt devices for operation at 115 Volt alternating voltage to a 230 Volt mains or vice versa. In addition to various winding ratios for all common voltages, there are models with a ratio of 1:1 they serve as isolating transformers. Toroidal transformers are available in various versions, adapted to different applications. However, they cause relatively high current peaks during the switch-on process (switch-on currents), since there is no air gap as with transformers with U or E cores.
Toroidal transformers cause considerably lower magnetic stray fields, tend to have less disturbing humming noises and absorb considerably lower currents in idle operation. Due to the closed toroidal core, toroidal transformers can only be wound with special machines.Ĭompared to transformers of conventional design, toroidal transformers offer a whole range of advantages: Their power density is larger, so that a more compact and lighter ring transformer is sufficient for the same performance.
This Kern consists of either soft-magnetic, ferritic materials, which are brought into the desired shape by a sintering or pressing process, or ring-shaped sheet strips, which are insulated from each other. Unlike transformers of conventional design, where the iron core consists of a U or E-shaped package of sheet metal lamellae, a ring-shaped Kern Transformer is used.
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