| 摘要 |
PROBLEM TO BE SOLVED: To provide a power accumulation circuit which eliminates an external battery for stably operating an electric-field detection type switch, can stably be operated even if an accumulated voltage is a low voltage around 3V, can efficiently accumulate electric charges from an extremely small-sized generator, and can supply power. SOLUTION: This power accumulation circuit includes: a first capacity for accumulating the extremely-small current electric charges; an electric-field detection type switch whose electrode 1 is connected to the first capacity, and an electrode 3 is connected to an input terminal of an extremely-low AC voltage, and which is turned off when the potential of the electrode 3 is positive or when the potential of the electrode 1 is not higher than a first voltage V1, turned on when the potential of the electrode 3 is negative and the potential of the electrode 1 is not lower than a second voltage V2 (V2>V1), and connects the electrode 1 and an electrode 2; a second capacity which is connected to the electrode 2 of the electric-field detection type switch, and accumulates the electric charges inputted from the first capacity when the electric-field detection type switch is turned on; and an output controller which turns on/off a first electronic circuit switch by comparing a power accumulation voltage of the second capacity with a reference voltage, and supplies power by using the electric charges accumulated in the second capacity. COPYRIGHT: (C)2011,JPO&INPIT |
