Ladeeinrichtung

2.1 Known charging devices for charging an accumulator of a mobile apparatus and for integrated signalling of absence require a three-wire connection between the charging device and the mobile apparatus. 2.2 In order to manage with only two wires between the charging device and the mobile apparatus, the charging device and the mobile apparatus have the following construction. The charging device (LE) contains a first control logic element (ST1) which detects the potential (+U) downstream of a first switch (S1) in the charging circuit and controls the first switch (S1) and a display (indicating) element (H). The mobile apparatus (MB) contains a second control logic element (ST2) which detects a potential at the input of a second switch (S2) of the mobile apparatus (MB) and controls the second switch (S2) and a charge controller (LS) by means of which a current source (electrical power source) (RS) is driven which can be regulated and is located in the charging circuit. 3. The figure shows a block diagram of the charging device and of the mobile apparatus.