EMI-FREE DC-DC BUCK CONVERTER FOR AEROSPACE APPLICATIONS

Jithu Unnikrishnan, O M Saji Chandrachood, A K Prakash, K K Mukundan

Abstract: Modern electronic systems require tiny, high-quality, less weight, reliable and efficient power supplies. Linear power regulator whose principle of operation is based on a voltage or current divider is inefficient sometimes. This is because their output voltage is smaller than the input voltage and also they require low frequency (50 or 60 Hz) transformers and filters. Their main area of application is at lower power levels; but at higher levels, switching regulators are used. They use semiconductor switches for the purpose of turning off and on states. Because there is a power loss in those states, switching regulators can achieve high energy conversion efficiencies and that is the major advantage. Power electronic systems such as switching power supplies are accounted as noise source for their sensitive circuits. EMI caused by the converters can disturb the normal operation of the supply and other systems by coupling with the nearby devices. Hence the overall performance of the system is reduced Major focus is done on the radiated EMI mitigation for the power converters in which the main standard is the compliance with the EMC standard to ensure the proper operation of the converter and nearby systems. Buck converter is a step-down converter which is one of the most widely used topologies among the different DC-DC topologies. In the forward topology, we are providing the galvanic isolation which isolates the functional sections of the electrical systems to prevent the current flow. No direct conduction is permitted. In this paper, different topologies are discussed and implemented which can reduce the Radiated Emission (RE) and MILSTD 461/462 will be the underlying EMC standard

Keywords: Radiated Emission (RE), soft switching, snubber, forward converter

DOI: https://doi.org/10.15623/ijret.2014.0313026