| 发明名称 | Alternating current power measuring apparatus | ||
| 摘要 | An alternating current power measuring apparatus includes a first capacitance element having one end connected to a conductor wire of a first electrical cable of a set of electrical cables for supplying alternating current to a load and having the other end capacitively coupled to a conductor wire of a second electrical cable, a first voltage measuring part which measures a first voltage which is a voltage of both ends of the first capacitance element, a first current measuring part which measures a first current flowing in the first electrical cable, and a processing part which computes a power to be supplied to the load by the set of electrical cables by the multiplication among a proportion between a specified voltage value of a voltage applied to the set of electrical cables and an effective value of the first voltage, the first voltage and the first current. | ||
| 申请公布号 | US9529024(B2) | 申请公布日期 | 2016.12.27 |
| 申请号 | US201213405650 | 申请日期 | 2012.02.27 |
| 申请人 | FUJITSU LIMITED | 发明人 | Oshima Hirotaka;Ambe Takayuki;Ito Akio |
| 分类号 | G01R21/06;G01R21/133 | 主分类号 | G01R21/06 |
| 代理机构 | Kratz, Quintos & Hanson, LLP | 代理人 | Kratz, Quintos & Hanson, LLP |
| 主权项 | 1. An alternating current power measuring apparatus comprising: a first capacitance element having one end capacitively coupled to a conductor wire of a first electrical cable of a set of electrical cables for supplying alternating current to a load and having the other end capacitively coupled to a conductor wire of a second electrical cable of the set of electrical cables; a first voltage measuring part for measuring a first voltage V which is a voltage of both ends of the first capacitance element; a first current measuring part for measuring a first current I flowing in the first electrical cable; and a processing part which accepts a value of Eeff being a standard voltage, accumulates N measurements of first voltage V and first current I over a predetermined period, and then computes a power P to be supplied to the load by the set of electrical cables according to the following formula: P=P0×Eeff/Veff wherein P0 is given by the following formula: P0=(1/N)Σ(V×I) Σ being the summation sign representing accumulation of the N measurements, and Veff being the effective value of the first voltage V for the predetermined period. | ||
| 地址 | Kawasaki JP | ||