초록 ▼

The invention concerns a charger (CU) for batteries (A) in an electrical mobile device (MU), wherein a power oscillator (OSZ) produces an alternating magnetic field with the primary part (W.sub.PRI) of an inductive coupler, for the inductive transmission of charging power. By alternatingly receiving

The invention concerns a charger (CU) for batteries (A) in an electrical mobile device (MU), wherein a power oscillator (OSZ) produces an alternating magnetic field with the primary part (W.sub.PRI) of an inductive coupler, for the inductive transmission of charging power. By alternatingly receiving power for charging the batteries (A), the mobile device (MU) which is coupled to the charger (CU), charges the entire inductive coupler via its secondary coupler part (W.sub.SEC). The charger (CU) contains detection means (SEL, AMP, RE and FE-DEM) which generate at least one control signal (S.sub.C 1, S.sub.C 2) when the inductive load of the coupler is periodically changed in order to switch the power level, which is inductively transmitted by the charger (CU) to the mobile device (MU), from a low average value in the stand-by mode to a higher average value for the charging operation.

대표청구항 ▼

[ What is claimed is:] [1.] A charger (CU) for batteries (A) in an electrical mobile device (MU) with inductive power transmission, where a power oscillator (OSZ) with a primary part (W.sub.PRI) of an inductive coupler produces an alternating magnetic field, which is charged via a secondary part (W.

[ What is claimed is:] [1.] A charger (CU) for batteries (A) in an electrical mobile device (MU) with inductive power transmission, where a power oscillator (OSZ) with a primary part (W.sub.PRI) of an inductive coupler produces an alternating magnetic field, which is charged via a secondary part (W.sub.SEC) of the inductive coupler by the mobile device (MU) that is connected to the charger (CU) and consumes power to charge the batteries (A), characterized in that the charger (CU) contains detection means (SEL, AMP, RE and FE-DEM) which generate at least one control signal (S.sub.C 1, S.sub.C 2) by periodically alternating the inductive load of the coupler resulting from the alternating consumption of power by the mobile device (MU) as a function of a burst frequency (f.sub.BU), to change the power level which is inductively transmitted by the charger (CU) to the mobile device (MU) for the charging operation, from a low average value in the stand-by mode to a higher average value.