What Is a Flyback Converter?

Flyback converter is widely used in alternating current direct current (AC / DC) and direct current direct current (DC / DC) conversion, and provides insulation isolation between the input stage and output stage. It is a type of switching power supply. Applications include low-power switching power supplies, high-voltage power supplies for picture tubes, and insulated gate drivers. They have the advantages of simple structure and wide application.

Flyback converter

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Flyback converter, widely used in AC / DC and DC / DC conversion, and provided between the input stage and output stage

USB Flyback USB Charger

The mainstream mobile phone USB chargers are all flyback converters. The figure shows the disassembly schematic diagram of iPhone charger ^[6] and the circuit diagram of a typical mobile phone charger flyback converter. The circuit in the figure uses primary winding-side control technology.

Application of flyback converter in mobile phone charger (2 photos)

CCD Flyback converter CCD power supply

For example, a CCD chip in a digital camera needs to be converted from a battery voltage (1.5 V-4 V) such as a lithium battery to 15 V. Flyback converters are commonly used in this case ^[7] .