Industrial electronics
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3 mistakes in controlled rectifier answers
3 mistakes that cost marks in controlled rectifier questions
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Lesson notes
Key points
- Using peak as RMS: Students plug 230 V in as Vm; fix it by using Vm equals root two times 230 volts.
- Wrong half-wave formula: Half-wave average is Vm over two pi times one plus cos alpha, not Vm over pi.
- Forgetting the degree mode: Firing angle in degrees with a radian-mode calculator ruins cos alpha; check the mode first.
Takeaway: Convert RMS to peak, use the right formula, check degree mode.
Quick check: For a 230 V RMS supply, what peak voltage Vm goes in the rectifier formula?
- About 325 V
- Exactly 230 V
- About 163 V
Vm = √2 × 230 ≈ 325 V; 230 V is the RMS value.
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