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yeh wat he said. maybe i can add a few things though to make it a little more simple. its an ac or pulse circuit. when the current flows from - to + on the input voltage, the circuit is completed on the cap side and the energy is stored into the capacitor. When the current flows from + to - the energy isn't released from the capacitor because it has no load to drain to. it becomes a voltage booster/doubler when the circuit its complete. the current will fill the capacitor flowing up through the diode. when the current switches directions, both voltages from the source and voltage from the capacitor are released into the load. im a nooby to this but maybe it helps! :)