Jun 21,2023
What isolated flyback converter?
An isolated flyback converter is a type of power supply circuit commonly used in electronic devices to provide DC (direct current) voltage conversion.
It is an isolated topology, meaning it provides electrical isolation between the input and output circuits, typically through the use of a transformer.
The flyback converter operates by storing energy in the magnetic field of the transformer during one part of the switching cycle and then releasing it to the output during another part of the cycle. It is called a "flyback" converter because the energy is stored in the transformer's magnetic field during the switch-on period and then "flies back" to the output during the switch-off period.
The primary components of an isolated flyback converter include a transformer, a switch (usually a MOSFET), a diode, and capacitors.
The switch controls the energy flow and is typically driven by a control circuit. During the switch-on period, energy is stored in the transformer's primary winding.
When the switch is turned off, the energy stored in the magnetic field is transferred to the secondary winding and rectified by the diode to provide the desired output voltage.
Isolated flyback converters are commonly used in low-power applications, such as consumer electronics, LED lighting, battery chargers, and small power supplies.
They offer advantages such as simplicity, low component count, and cost-effectiveness. However, they are generally not suitable for high-power applications due to limitations in transformer size and switching losses.
