In Flyback regulator, there is two circuitry operation, One is Switch On phase when the primary winding of the transformer charged up, and another one is Switch off or the transfer phase of the transformer when the electrical energy gets transferred from primary to the secondary and finally to the load. PWM stands for Pulse Width modulation technique. It is due to the frequency of turning off and turning on time of the switch. Another most important thing is the transformer phasing, the dots shown in the primary and secondary winding.Īlso, as we can see, a PWM signal is connected across the transistor switch. The core determines the flux density which is an important parameter for transferring electrical energy from one winding to the other. The transformer consists of minimum two inductors, known as secondary and primary coil, winded up in a coil former with a core in between.
We need to understand the proper working of a transformer before understanding the actual circuitry operation. If we see the basic single output flyback design like the image below we will identify the basic main components which are required to build one.Ī basic flyback converter requires a switch, which can be a FET or transistor, a Transformer, an output Diode, a Capacitor. Let’s explore basic single output flyback operation. Why we need isolation? In some special cases, for minimizing the power noise, and safety-related operations, we need an isolated operation, where the input source is completely isolated from the output source. The conversion efficiency is high in both cases.Īnother thing in Flyback converter is the electrical isolation in both input and output. For example, we can create +5V, +9V and -9V output from a single converter module. Not only that, a flyback topology allows the designer to change the polarity of the output at the same time. This is a versatile topology which can be used where multiple outputs are needed from a single output supply. Other than those regulators, there is another regulator exists which is a popular choice among all designers, which is Flyback regulator or Flyback converter. It’s a popular choice where we need to convert a higher voltage to a lower output voltage. A buck topology or buck converter is one of the most used basic topology used in SMPS. Also, in case of boost regulator the output voltage is higher than the input voltage, but in the buck regulator, the output voltage will be lower than the input voltage. The difference between the buck and boost regulator is, in the buck regulator the placement of inductor, diode and the switching circuit is different than the boost regulator. In this tutorial, we will describe the Flyback Regulator circuit. We already explained Boost Regulator and Buck Regulator circuit. There are three types of switching regulators available.ģ.