Contents
Does transformer have air gap?
In the case of a transformer or inductor, the air gap only reduces the slope of the B/H loop, reducing permeability and inductance, and hence increasing the magnetizing current in the primary. Thus, in the transformer example, the gap is used to reduce the inductance (perhaps for resonant applications).
What is a flyback voltage?
A “Flyback Voltage Spike” occurs when the supply current to an inductive load such as a solenoid is interrupted. They are inexpensive, sufficiently fast, and have a high enough reverse voltage and the current capacity needed for the application.
How is energy stored in a flyback transformer?
During each cycle, when the input voltage is applied to the primary winding, energy is stored in the gap of the core. It is then transferred to the secondary winding to provide energy to the load. Flyback transformers are used to provide voltage transformation and circuit isolation in flyback converters.
How to calculate the number of turns on a fly back transformer?
The calculator below calculates the number of turns, the inductance, and the wire gauge for the various windings of a discontinuous mode fly-back converter.
How are coupled inductors different from flyback transformers?
This energy storage aspect distinguishes flybacks from other topologies such as forward-mode where energy transfers immediately from primary to secondary. Flyback transformers are also known as coupled inductors, because they have a gapped core construction and store energy in the core. How does a flyback controller work?
Which is a critical parameter of a flyback transformer?
If the load requires more energy at this point, the energy storage capability of the transformer will be exceeded and the load will not receive the required energy. This will lead to loss of regulation, therefore the peak primary current (Ipk) or primary saturation current (Isat) of a flyback transformer is a critical parameter.