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A pair of cylindrical coils, wound around a rod-shaped piece of powdered iron or ferrite, was once a common configuration for transformers at radio frequencies. Sometimes this type of transformer is still seen, although it is most often used as a loopstick antenna in portable radio receivers and in radio direction-finding equipment.
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332 Transformers and impedance matching The coil windings might be placed one atop the other, or they might be separated (Fig. 18-5) to reduce the capacitance between the primary and secondary.
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18-5 Solenoidal-core transformer.
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In a loopstick antenna, the primary serves to pick up the radio signals. The secondary winding provides the best impedance match to the first amplifier stage, or front end, of the radio. The use of transformers for impedance matching is discussed later in this chapter.
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Toroidal core
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In recent years, the toroidal core has become the norm for winding radio-frequency transformers. The toroid is a donut-shaped ring of powdered iron or ferrite. The coils are wound around the donut. The primary and secondary might be wound one over the other, or they might be wound over different parts of the core (Fig. 18-6). As with other transformers, when the windings are one atop the other, there is more inter-winding capacitance than when they are separate.
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18-6 Toroidal-core transformer.
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Toroids confine practically all the magnetic flux within the core material. This allows toroidal coils and transformers to be placed near other components without inductive interaction. Also, a toroidal coil or transformer can be mounted directly on a metal chassis, and the operation will not be affected (assuming the wire is insulated). A toroidal core provides considerably more inductance per turn, for the same kind of ferromagnetic material, than a solenoidal core. It is not uncommon to see toroidal coils or transformers that have inductances of 10 mH or even 100 mH.
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Pot core
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Still more inductance per turn can be obtained with a pot core. This is a shell of ferromagnetic material that wraps around a loop-shaped coil. The core comes in two
The autotransformer 333 halves (Fig. 18-7). You wind the coil inside one of the halves, and then bolt the two together. The final core completely surrounds the loop, and the magnetic flux is confined to the core material.
18-7 Exploded view of pot core (windings not shown).
Like the toroid, the pot core is self-shielding. There is essentially no coupling to external components. A pot core can be used to wind a single, high-inductance coil; sometimes the value can be upwards of 1 H. In a pot-core transformer, the primary and secondary must always be wound on top of, or right next to, each other; this is unavoidable because of the geometry of the shell. Therefore, the interwinding capacitance of a pot-core transformer is always rather high. Pot cores are useful at the lower frequencies. They are generally not employed at higher frequencies because it isn t necessary to get that much inductance.
The autotransformer
Sometimes, it s not necessary to provide dc isolation between the primary and secondary windings of a transformer. Then an autotransformer can be used. This has a single, tapped winding. Its schematic symbol is shown in Fig. 18-8A for an air core, and Fig. 18-8B for a ferromagnetic core. An autotransformer can be either a step-down or a step-up device. In Fig. 18-8, the autotransformer at A is step-down, and the one at B is step-up. An autotransformer can have an air core, or it can be wound on any of the aforementioned types of ferromagnetic cores. You ll sometimes see this type of transformer in a radio-frequency receiver or transmitter. It works quite well in impedance-matching applications, and also in solenoidal loopsticks. Autotransformers are occasionally, but not often, used at audio frequencies and in 60-Hz utility wiring. In utility circuits, autotransformers can step down by a large factor, but they aren t used to step up by more than a few percent.
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