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This module will now take a look at the issues a bad choice of a power supply are in an application. The first to come into mind is power loss at high temperatures. Power loss is defined as the difference between power input and power output. In order to reduce the power loss in a power supply, customers would need to increase the efficiency. To design an optimum DC/DC converter, users need to reduce the loss of power at every stage of the conversion process. The first stage is the input filter. The main losses here are in the inductor and track impedances. In the second stage, the power oscillator, the FETs and switching have to be taken into account. The third stage is the transformer. The main losses here come from the winding impedances and the ferrite core. In the fourth stage, the output stage, rectification and track impedance losses are the main concerns. Finally, the Feedback circuit, which is the fifth stage, generates losses through the optocoupler and the start-up transistor bias.
PTM Published on: 2011-11-03
