Advanced Qualification · A-004 Power supplies · A-004-001-003
Dans une alimentation à double alternance utilisant un transformateur à prise médiane, quelles que soient les conditions de la charge, la tension inverse de crête mesure :
- A0,707 fois la tension efficace
- B1,4 fois la tension efficace
- C2,8 fois la tension efficace
- D0,636 fois la tension efficace ("RMS")
Correct answer: C — 2,8 fois la tension efficace. Question tirée de la banque officielle d'ISDE.
Why
In a full-wave centre-tap supply, each diode must block the entire voltage from the other half of the transformer winding plus the output voltage, which totals roughly twice the peak voltage of one half. The full explanation — and one for every question — is in Pro.
Practise this section
Power supplies is section A-004 of the Advanced exam: Power supplies: rectifiers, filtering, regulation, switching supplies and their failure modes.
Drill A-004 — free, no account