Diode Reverse Recovery and its Effect on Switching Losses

<strong>Effect</strong> of parallel caps on switching losses
Eon <strong>and</strong> Eoff losses with a snubber Capacitance
Etot / Eon / Eoff losses [uJ]
100
90
80
70
60
50
40
30
20
10
A small capacitance can help to reduce the overall switching losses
Etot at 300V
Etot at 200V
Etot at 100V
Eoff at 300V
Eon at 300V
Eoff at 200V
Eon at 200V
Eoff at 100V
Eon at 100V
0
0 100 200 300 400 500 600 700 800 900 1000
80 pF @ 300 V
Capacitance parallel to the <strong>Diode</strong> [pF]
200 pF @ 200 V 450 pF @ 100 V
As higher the voltage, as smaller the cap to decrease the overall losses.
30