| 摘要 |
The switching indicator (10) according to the invention of a grounded power cable of a vehicle (100) has an indicator circuit (11 ), a direct voltage regulator (12) for generating direct voltage and an amplifier (13). The indicator circuit (11 ) is configured to supply base current of a transistor (V4) belonging to the amplifier (13) via a high-impedance connection at least to the neutral conductor (2) of the power cable, when the power cable is connected to the electrical network. The passage of the base current of the transistor (V4) through the power cable to the grounding point of the electrical network causes a change in the operative state of the transistor (V4). The change in the transistor's operative state is configured to indicate whether the power cable is connected to the alternating voltage network or not. Instead of a transistor amplifier, either an operational amplifier or a comparator can also be utilized. |
