| 摘要 |
<p>The method involves supplying measuring currents (I1, I2) over shunts, which are arranged at different points. The measuring current is flowed in a potential, which deviates from a potential of an evaluation point around 50 Volts. The shunts are inserted in a current balancing circuit such that voltage drop produces asymmetry in a current mirror, where the voltage drop is caused by the measuring current. A height of the mirror is proportional to the measuring current. The measuring current is earth current of a photovoltaic system with selective earthing of positive pole or negative pole. An independent claim is also included for a circuit arrangement for measuring earth current of a photovoltaic system.</p> |
