Transformers that reduce, or step-down, higher voltage to voltages less than 30 volts (V) are called low-voltage transformers. They are commonly used to reduce the standard home 120 volt to 12 volts or 24 volts. A wide variety of everyday appliances use these transformers including low voltage external path lighting, under-counter lighting, door bells and thermostats. Both magnetic and electronic low-voltage transformers are in common use, and each has its advantages.
- In a magnetic low-voltage transformer, two coils of wire, the primary and secondary coil, are used. The primary coil carries the input or high voltage and creates a magnetic flow, which induces a current in the secondary coil. Since there are more windings in the primary coil than in the secondary, the secondary coil has a lower voltage. The exact output voltage depends on the number of windings in the two coils.
- The electronic version contains a small transformer and an inverter. The inverter changes the frequency at which the alternating current into the transformer changes directions. In a home low-voltage use, it typically changes the frequency of the 120-volt home power outlet from 50 hertz or 60 hertz (or cycles per second) to around 20,000 hertz. The higher the frequency of the voltage, the smaller the transformer needed to provide the required output voltage.
Function of the Magnetic Low-Voltage Transformer
Function of the Electronic Low-Voltage Transformer
Benefits of the Magnetic Transformer
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Benefits of the Electronic Transformer
Considerations
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1 comments on "Lighting Control:Magnetic Vs. Electronic Low-Voltage Transformers"
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Hi,
You have nicely distinguished between electronic and magnetic transformer. This is really an informative post. Thanks for sharing all these helpful information.
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