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Advantages of Forward converter | disadvantages of Forward converter

This page covers advantages and disadvantages of Forward DC-DC converter, its Circuit and working operation. It mentions benefits or advantages of Forward converter and drawbacks or disadvantages of Forward converter.

What is Forward converter?

About DC to DC converter:
A dc-dc converter is electronic circuit. The main function of this circuit is to modify one potential difference(i.e. voltage) level to the another potential difference level. It is basically a voltage regulator consisting of switches, inductor and capacitor for power conversion. There are numerous applications of DC-DC converter.

DC-DC converters are divided into following types based on isolation between input and output circuits. • Isolated DC-DC converter and Non-isolated DC-DC converter

Isolated DC-DC converters are further divided into following sub types.
• Fly-back • Forward • Half bridge • Full bridge • Push Pull

Forward converter

About Forward converter circuit working operation:
The figure depicts forward converter circuit. It is a form of DC-DC converter similar to a fly back and Half bridge converters. It can deliver an output voltage whichever more or less in reference to input voltage along with electrical isolation. The single transistor forward converter is commonly used for off-line supplies in the power range below 200 W. Because of its simplicity and low component count makes it a viable alternative to the Fly back converter, when ever galvanic isolation is required. It is as well used to step up or step down the potential. The Forward converter is usually a good choice when high output current is required. These converters produce symmetrical AC waveforms across the first section winding of the transformer. Therefore, core flux is excited bi-directionally, follow-on a better employment of magnetic core and results in increased power rating.

Benefits or advantages of Forward converter

Following are the benefits or advantages of Forward converter:
➨It offers better transformer utilization. Forward converter transfers energy instantly across the transformer and does not rely on energy storage. The resulting lower peak currents in primary as well as secondary means lower copper losses compare to fly-back converter. The transformer can be made more ideal with much higher magnetizing inductance and no air gap.
➨The output inductor and freewheeling diode keep the output current fairly constant. Hence secondary ripple current is dramatically reduced. As a result, output voltage ripple is reduced dramatically.
➨Due to much larger magnetizing inductance lower active device peak current.

Drawbacks or disadvantages of Forward converter

Following are the drawbacks or disadvantages of Forward converter:
➨Increased cost due to requirements of additional output electrical device and freewheeling diode.
➨Minimum load requirements: significantly with multiple outputs, the gain dramatically changes if the device goes into DCM (Discontinuous Conduction Mode) operation (at lightweight loads).
➨Higher voltage demand for the MOSFET, which frequently discourages the use in off-line applications that has got to work on 230V grids.

Conclusion: In order to understand advantages of Forward converter and disadvantages of Forward converter one has to understand Forward converter basics.

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