Another important switch mode power supply is Forward Converter. It is another isolated type SMPS and produces controlled and regulated DC from an unregulated DC supply.
The efficiency of Forward Converter is slightly more than that of Flyback Converter and is often used in application where the power requirements are a little higher (typically around 200W). The design of Forward Converters is slightly complex than Flyback Converters and a simple structure is shown below.
The polarity of the voltage induced in the secondary is similar to that of the primary and hence, the diode D1 gets forward biased. The voltage from the secondary will start to flow through the diode D1, inductor, capacitor and finally the load. During this period, both the inductor and capacitor store energy in the form of magnetic field and electric field respectively.