By R. Erickson

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2. 3. 4. 5. 6. 2. Inductor volt-second balance, capacitor charge balance, and the small ripple approximation Actual output voltage waveform, buck converter iL(t) 1 Buck converter containing practical low-pass filter L + vL(t) – Vg + iC(t) 2 + – C R v(t) – Actual output voltage waveform Actual waveform v(t) = V + vripple(t) v(t) V v(t) = V + vripple(t) dc component V 0 t Fundamentals of Power Electronics 7 Chapter 2: Principles of steady-state converter analysis The small ripple approximation Actual waveform v(t) = V + vripple(t) v(t) v(t) = V + vripple(t) V dc component V 0 t In a well-designed converter, the output voltage ripple is small.

The average capacitor current is then zero.

2. Inductor volt-second balance, capacitor charge balance, and the small ripple approximation Actual output voltage waveform, buck converter iL(t) 1 Buck converter containing practical low-pass filter L + vL(t) – Vg + iC(t) 2 + – C R v(t) – Actual output voltage waveform Actual waveform v(t) = V + vripple(t) v(t) V v(t) = V + vripple(t) dc component V 0 t Fundamentals of Power Electronics 7 Chapter 2: Principles of steady-state converter analysis The small ripple approximation Actual waveform v(t) = V + vripple(t) v(t) v(t) = V + vripple(t) V dc component V 0 t In a well-designed converter, the output voltage ripple is small.

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