| 摘要 |
<p>An electrical device with an impedance detector comprises a path from a supply voltage to a second voltage. The path comprises segments having electrical impedances, at least one of which is to be ascertained, and a measuring vertex. The impedance detector further comprises a discriminator connected to the measuring vertex, arranged to evaluate a measuring voltage observed at said measuring vertex, and situated in a path between a further supply voltage and a third voltage. The discriminator draws no significant current from said supply voltage if the to be ascertained impedance remains above a threshold value. In this manner, in a standby mode, a zero-power supervision of a condition when to resume operation can be achieved.</p> |
