Transcription of AN604 Application note - st.com
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AN604 Application note - st.com
August 2011 Doc ID 3607 Rev 31/12AN604 Application noteCalculation of conduction losses in a power rectifierIntroductionThis Application note explains how to calculate conduction losses in a power diode by taking into account the forward voltage dependence on temperature and the current ideal current and voltage waveforms of an ultrafast diode in a power supply system during a switching cycle are shown in Figure current and voltage waveforms of a diode in a switch mode power supplyThe conduction losses in a diode appear when the diode is in forward conduction mode due to the on-state voltage drop (VF). Most of the time the conduction losses are the main contributor to the total diode power losses and the junction temperature rising. This is the reason why it is important to accurately estimate (t)VD(t)VD(t)IMaxIMinttID(t)VRVF00 Tsw TswFSwitching frequencyTSwitching periodDuty cycleTDuration of diode conductionIMaximum forward currentIMinimum forward currentVForward voltageVReverse voltageswswswmaxminFR ID 3607 Rev 3 Contents1 Diode forward characteristics.
August 2011 Doc ID 3607 Rev 3 1/12 AN604 Application note Calculation of conduction losses in a power rectifier Introduction This application note explains how to calculate conduction losses in …
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