Basics of Flyback Converters
Flyback converters are defined as power converters, that convert AC to DC with galvanic insulation between the inputs and outputs. It stores the energy when the current flows through the circuit and releases the energy when the power is switched off. It uses a mutually coupled inductor and acts as an insulated switching converter for step-down or step-up voltage transformers.
It can control and adjust the multiple output voltages with a broad range of input voltages. The number of components required to design a flyback converter is few when compared to other switching mode power supply circuits. The word flyback is mentioned in the on/off action of the switch used in the design.
Freewheeling Diode
In an Electrical circuit, a Diode is a semiconductor device that acts like a one-way switch (it allows current to flow in one direction and restricts the current to flow in another direction). Semiconductor is made up of p-type and n-type materials. Semiconductors have conductivity between conductors and insulators. To control the Load voltage, a switching element is used to switch at a particular frequency.
A severe high voltage occurs at the time the switching element is activated due to the stored energy within the magnetic field of the inductive load coming across the switching element terminals in switch OFF condition which may destroy the switching element. To distribute this energy, a Freewheeling diode is used. The Load can be short-circuited at the time the switching element is inactivated. The energy stored in the magnetic field is degenerate like heat.
Table of Content
- What is a Freewheeling Diode?
- Basics of Flyback Converters
- Operation
- Importance in Inductive Load Circuits
- Advantages
- Disadvantages
- Applications
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