What are the Applications of Autotransformer?

An autotransformer is a type of electrical transformer where a single winding is used to serve as both the primary and secondary winding. It differs from a standard transformer, where the primary and secondary windings are separate and not electrically connected.

In an autotransformer, a portion of the winding acts as the primary winding, while another portion of the same winding acts as the secondary winding. The two portions are electrically connected and share a common conductor. This design results in a smaller, lighter, and more efficient transformer compared to a standard transformer. Autotransformers have many uses in our life. In the following, ATO industrial automation will introduce the application of autotransformer.

• Line voltage drop compensation. Long power lines often suffer from voltage drop, especially in applications that draw high current, like spas or hot tubs. An autoformer can be used to compensate for this loss of voltage.
• Testing an electronic device after repairs. After an electronic device is repaired, it is best to power up the device slowly to ensure that the replaced parts do not burn up. Often times, if high voltage is supplied without testing, the parts burn out. Using the auto transformer for slowly powering up the repaired device prevents the replaced part from getting damaged again.
• To power up an old amplifier or radio. If you haven't used an old amplifier or radio for a long time and wish to listen to it now, it is best to power it up slowly. The electrolytic capacitors need to be re-conditioned and that can be done by applying reduced voltage through an auto transformer.
• Temperature adjustment in resistance-type heater. Temperature of resistance-type heather can be adjusted by varying the AC voltage with an autotransformer.
• Changing speed of a fan. By changing the AC voltage that is being applied to AC motors, their speed can be controlled. So, an autotransformer can be used to change AC voltage and control speed of motors which drive fans.
• Cutting styrofoam. Styrofoam and many other kinds of foam are normally cut into shape by a hot wire cutting system. By using an autotransformer, you can control the hot wire's temperature and adjust it accordingly to meet the desired requirements
• Unregulated DC power supply of high current. An unregulated DC power supply of high current can be constructed with an autotransformer, filter capacitor and a high current rectifier. However, you should not attempt this if you're unaware of safety concerns associated with an autotransformer. The autotransformer is connected with AC power which means that AC voltage is accessible directly and there is risk of electric shock.
• AC supply voltage adjustment. With an autotransformer, AC power supply’s output voltage can be adjusted easily.
• Roasting beans for coffee. To have the best coffee, coffee experts prefer roasting their coffee beans. An autotransformer can be used to adjust the temperature at the ideal level for roasting.