| 摘要 |
<p>The object of the present invention is, in a power control device including an auxiliary circuit that is connected in parallel to an output circuit and controls an adjusting current smaller by a substantially constant ratio than an output current, to control the ratio of the output current to the adjusting current at a constant level by controlling the output circuit and the auxiliary circuit so that the potentials of the corresponding terminals agree with each other. As a means for attaining the object, the power control device comprises a bridge of four branches including an output circuit, an auxiliary circuit, a load, and either of a current detector or a current setting circuit. The power control device detects the potential difference between the terminals of the output circuit and the corresponding terminals of the auxiliary circuit and feeds back the potential difference to one of the four branches of the bridge and changes the equivalent impedance of the branch, thereby controlling the bridge to keep the balance. <IMAGE></p> |
