flyback transformer low voltage transformers power transformer FLYBACK TRANSFORMER The flyback circuit utilizes the "flyback" action of an inductor or flyback transformer to convert the input voltage and current to the desired output voltage and current. A modern flyback transformer and circuit design can now permit use in excess of 300 watts of power, but most applications are less than 50 watts. A flyback transformer first saves energy received from the input power supply (charging portion of a cycle) and then transfers energy (discharge portion of a cycle) to the output, usually a storage capacitor with a load connected across its terminals. A modern flyback transformer is operated at high frequency hence gapped ferrite core materials are typically used. You can find a flyback transformer in all sorts of screens and monitors which require a cathode ray tube (CRT) including television screens and computer monitors. The flyback transformer has many purposes - the creation of the acceleration voltage for the CRT (typically 20-30kV), and of many auxiliary voltages.