GE DS3800HNMB Power AC module

For the bridge rectifier configuration shown, the peak inverse voltage (PIV) equals 1.414 times the secondary rms voltage. For example, a 40 Vrms secondary will develop 1.414 * 40 = 56.6 PIV across the rectifier diodes. To allow for line variation and spiking, allow at least a 50% safety factor in the diode rating. Therefore, the PIV rating of the rectifier diodes should be at least twice the rated secondary rms voltage.

Since each diode conducts only on alternate cycles

 the average diode current will be half the supply’s average DC current load on the supply. When power is first applied, there is a surge of current to charge the capacitor(s) which must be less than the diode’s peak one cycle surge current (IFSM) rating. Typically, diodes are chosen with an average current rating of at least twice the average current load of the supply.

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