Energy dissipation reduction during adiabatic charging and discharging with controlled inductor current

Adiabatic charging and discharging of a capacitor with an inductor current by controlling switching transistors is demonstrated experimentally. First, we designed an eight-step charging and discharging circuit. The switching transistor ratio is designed to range from zero to one in one-eighth steps. By changing the switching transistor ratio stepwise, output voltage is generated stepwise. Using the stepwise voltage, adiabatic charging and discharging can be performed. In N-step charging, it is clarified that the energy dissipation is reduced to 1/N from the measurement of the power supply current, compared with the conventional charging and discharging of a capacitor.