| 摘要 |
The invention relates to a power supply unit for a portable electric device, which comprises a first connection (1) for an internal energy accumulator (IE), a second connection (2) for an external energy accumulator (EE) and a third connection (3) for an external dc supply (EG). The inventive power supply unit is characterized in that the first connection (1) is designed for a first nominal voltage (VIE), the second connection (2) for a second nominal voltage (VEE) and the third connection (3) for a third nominal voltage (VEG). The third nominal voltage (VEG) is greater than the second nominal voltage (VEE) and the latter is greater than the first nominal voltage (VIE). According to the invention, the connection (1, 2, 3) is adapted to be used with the highest nominal voltage if the actual voltage on said connection (1, 2, 3) lies within a defined range. |
