To provide a power-increase function that enables operation for a long time, using a small-capacity storage battery for an outdoor or portable power supply.

Increased power is generated for a long time by a circuit that has the power-increase function and an operational principle. A part of the circuit is constituted by plasma, so that a long-time operation is made possible with the small-capacity storage battery on a power-increasing effect, by operating the circuit with a pulse current of very sharp rising waveforms.