The isolated dc to dc converters use a transformer to provide the isolation, multiple outputs, a different voltage level, or polarity depending on the turns ratios and directions of the windings. All these are non-isolated and use the inductor as the energy transfer element and are mostly used in board level power conversion and regulation. The buck converter is a step-down, the boost a step-up while the buck-boost is both step-up and step-down. Each has its advantages and drawbacks which determines the suitability for any specific application.įigure 2 non-isolated converter circuit arrangements These configurations are the most used topologies due to their simplicity and use of fewer components. There three basic converter circuits that are widely used in DC to DC converters are the buck, boost, and the buck and boost. The size, weight and cost of the converter are largely determined by these components. The converter uses non linear components such as the semiconductor switches, and linear reactive components such as the inductors, transformers and capacitors for intermediate energy storage as well as current and voltage filtering. There are several kings of converters based on the source input voltage and the output voltage and these falls into four categories namely the AC to DC converter known as the rectifier, the AC to AC clycloconverter or frequency changer, the DC to DC voltage or current converter, and the DC to AC inverter. The converter acts as the link or the transforming stage between the power source and the power supply output. The DC to DC converters are used in a wide range of applications including computer power supplies, board level power conversion and regulation, dc motor control circuits and much more. It is used to increase or decrease the magnitude of the input voltage, invert polarity, or produce several output voltages of either the same polarity with the input, different polarity, or mixed polarities such as in the computer power supply unit. A converter may do one or more functions and give an output that differs from the input. Inlets, Outlets and Connectors StandardsĪ converter is an electrical circuit which accepts a DC input and generates a DC output of a different voltage, usually achieved by high frequency switching action employing inductive and capacitive filter elements.Ī power converter is an electrical circuit that changes the electric energy from one form into the desired form optimized for the specific load.
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