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Also remember that the circuit input reactance will be opposite in polarity with the source reactance when matching. This allows you to double check the calculator and make sure that it selected appropriate values, by making sure the impedance correctly matches the input impedance. The outputs of this tool give you the component values as well as a graph of the impedance looking into the pi circuit from the source. The previous tutorial in this series highlighted the performance, flexibility, and speed benefits of using power modules to design power systems, then provided an overview of the modular design process. If you are unsure what the reactance is set it to zero for a first pass approximation. How to design modular DCDC systems, part 2: filter design.
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The inputs ask for source resistance and source reactance. There is one menu item to select if there is to be any DC current or not, that also affects the topology. For example in some topologies there may be 2 inductors and one capacitor and in a different configuration it may be 2 capacitors and one inductor. The circuit topology can change depending on the inputs. There are some important items to understand when using this tool. This calculator will give you the circuit topology as well as the component values. This technique doesn’t work for wide band requirements, but is a simple way to achieve this at a specific frequency. This tool will help you create a matching circuit so that optimal power transfer occurs between unmatched loads. The Pi match circuit gets its name because the circuit topology can look like a pi symbol.