Industrial electronics
Why?
Why Can a Boost Converter Output More Voltage?
Why can a boost converter output more voltage than its input?
Quick check · tap an answer to continue
Lesson notes
Key points
- Because when the switch closes, input current flows through the inductor and stores energy in its magnetic field.
- Because when the switch opens, the inductor resists any change in current, so its voltage reverses and adds to the input.
- Because the diode then passes this combined voltage to the output capacitor, which holds it steady, giving Vout equal to Vin divided by one minus D.
Takeaway: So the inductor's stored energy stacks on the input to raise voltage.
Quick check: An ideal boost converter has 12 V input and D = 0.75. What is Vout?
- 9 V
- 48 V
- 16 V
Vout = 12 ÷ (1 − 0.75) = 12 ÷ 0.25 = 48 V.
Energy storageSeries additionDuty cycle
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