| 摘要 |
PROBLEM TO BE SOLVED: To provide a power supply device which can shield electric fields from one-phase or two-phase conductors among electrostatic induction which an electrode receives from three-phase conductors to obtain electric power efficiently, and which also has increased adaptability to actual power transmission and distribution lines.SOLUTION: A power supply device 100 comprises: an induction electrode 1 disposed in the vicinity of one conductor 210 among a plurality of conductors 200; a grounded shield 2, disposed between at least one conductor 221 of other conductors 220 among the plurality of conductors 200 and the one conductor 210, the grounded shield 2 shielding the induction electrode 1 from electric fields generated from at least the one conductor 221 among the other conductors 220; a transformer 4 connected to a stray electrostatic capacitance between the induction electrode 1 and the shield 2 in parallel to the stray electrostatic capacitance between the induction electrode 1 and the shield 2; and an output unit 3 which is led out from opposite ends of a parallel circuit formed by the stray electrostatic capacitance between the induction electrode 1 and the shield 2 and an excitation susceptance of the transformer 4. The parallel circuit functions as a parallel resonance circuit while power is supplied from the output unit 3 to a load 300. |
