Resonant charging vs. resistive charging of a capacitor

103

01:23:20

Art of Electronics 3rd ed. Figure 1.86

green: current trough inductor
blue: capacitor's voltage
red: current trough resistor
yellow: voltage of capacitor

Resonant charging (lower circuit) is lossless (with ideal components) compared with the 50% efficiency of resistive charging. 

Charging is complete after tf, equal to a half-cycle of the resonant frequency f=1/sqrt(2*pi*L*C)

The series diode terminates the cycle, which would otherwise continue to oscillate between 0 and 2Vin.

With resonant charging the capacitor charges up to 2x of the charging voltage (minus diode drop).

published 9 years ago

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