In NCEES power exam prblem 515 can someone please explain to me why you have to use 2x the peak voltage for determining the maximum reverse rating across the diode? I understand that you multiply the 120rms voltage by 1.4 to get a peak voltage of 170V but I dont understand why you must use 2x this voltage for the reverse voltage across the diode?
Can someone please provide me with a quick explanation.
On another note, for problem #518 why is the DC voltage on the secondary of the 3-phase diode bridge 1.2x the L-L Vrms voltage of the input. I dont understand where the 1.2 multiplier is coming from. I thought that DC voltage was the same as AC rms voltage?
Can someone please provide me with a quick explanation.
On another note, for problem #518 why is the DC voltage on the secondary of the 3-phase diode bridge 1.2x the L-L Vrms voltage of the input. I dont understand where the 1.2 multiplier is coming from. I thought that DC voltage was the same as AC rms voltage?