Hi Suppose we have to design for a 10A output from half bridge converter. We normally use high frequency double diode as rectifier with centre tape secondary. Does we need a 5A+5A (i.e. 5A per diode) double diode for that or a 10A+10A (i.e. 10A per diode) double diode
Thanks. Does that mean for half bridge operating at 50% maximum duty cycle, for 10A output current the rms current of each diode will be Irms = 10 * square root of 0.5 Irms = 7.07 Amperes and with 20% margin Irms will be Irms = (0.2 * 7.07) + 7.07 Irms = 8.48 Amperes
Thus we will need a double diode with rating of 8.48A + 8.48A (i.e. 8.48A per diode)
Author
Azeem
Posted
11/25/2011 12:25:53 AM
Response topic
DOUBLE DIODE RATING
Message
Half bridge output diodes will only see 5A each average current if it is operated at 50% duty cycle other wise . You need to look at RMS current requirement for the diodes. then you will put at least 20-30% margin on the top of it. One thing for sure they will not be 5A 5A rating ,, KY
