| 摘要 |
<p>The invention relates to a controller for a battery charger (CU) which inductively supplies electrical power to charging a battery (A) in a mobile device (MU). The battery charger (CU) includes a self-oscillating power oscillator (OSZ) with at least one separate resonance circuit (W1, C1, C3, and W2, C2, C4) in the output circuit. The mobile device (MU) contains at least one resonance circuit in the inductive coupling section. According to the invention, to detect the coupled mobile device (MU), the controller periodically changes the oscillation frequency (fosz) of the oscillator (OSZ) during a short test duration (T2) and monitors a resulting change in the oscillator operating current (Iosz). <IMAGE></p> |
