Induction charger for inductive energy transfer to an induction battery device and method for inductively charging an induction battery device

摘要

The invention relates to an induction charging device (12) for inductive energy transmission to an induction battery device (14), comprising at least one primary oscillating circuit (42) having at least one charging coil (16) and a control unit (48) for controlling the primary Oscillating circuit (42) by means of an inverter circuit (32, 34), wherein an exciting frequency (Fa) of a half-waves (56a, 56b, 58a, 58b) existing output signal (54) of the inverter circuit (32, 34) substantially a resonant frequency (fR ) corresponds to the primary oscillator circuit (32, 34). The induction charging device according to the invention is characterized in that the control unit (48) drives the inverter circuit (32, 34) after reaching a charge end voltage (ULT) of the induction battery device (14) to reduce a charging current (IL) such that the output signal ( 54) periodically at least a first half-wave (56a, 56b) to a high value (high) and immediately thereafter an odd plurality of successive half-waves (58b) is set to a high value (high) reduced value (low). Furthermore, the invention relates to a method for inductively charging an induction battery device (14) by means of an induction charging device (12) having an inverter circuit (32, 34) and at least one primary oscillator circuit (42), comprising the steps of: - charging the induction battery device (14) in a first Phase (I) having a substantially constant charging current (IL) such that an exciting frequency (fa) of a half wave (56a, 56b, 58a, 58b) output signal (54) of the inverter circuit (32, 34) for driving the primary Resonant circuit (42) substantially corresponding to a resonant frequency (fR) of the primary oscillator circuit (42), - charging the induction battery device (14) after reaching a charge end voltage (ULT) of the induction battery device (14) in a second phase (II) with respect to Charging current (IL) of the first phase reduced charging current (IL) such that the output signal (54) of the Wech At least one first half-wave (56a, 56b) is periodically set to a high value (high) and immediately thereafter an odd plurality of successive half-waves (58b) to a value (low) which is lower than the high value (high). is set. The invention also relates to an induction charging device (10), in particular a hand tool induction charging device (11), with at least one induction charging device (12) according to the invention and an induction battery device (14).