Patent ID: 11936203
Assignee: E.G.O. ELEKTRO-GERAETEBAU GMBH
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 0:
1. A method for operating a device (100) for wireless transfer of energy in the direction of an electrical consumer (200) by means of inductive coupling, the method comprising:
providing the device (100) comprising:
a rectifier (108) for generating a DC voltage (U_S) from a grid voltage (U_N),
an inverter (102) fed from the DC voltage (U_S), which is designed to generate a pulse-width-modulated actuation signal (A_S),
a power coil (101) actuated by means of the pulse-width-modulated actuation signal (A_S), by means of which a magnetic alternating field can be generated to transfer the energy, and
a communication unit (111), which is designed to exchange data bidirectionally with the electrical consumer (200), and

sequentially carrying out a power transfer (LTX), a data exchange (DAT), a measurement of setup parameters (MAP), and a measurement of a resonance frequency (MRF), wherein:
during the power transfer (LTX), an electrical actual power emitted by the inverter (102) is regulated to a predetermined electrical setpoint value,
during the data exchange (DAT), data are exchanged between the device (100) and the electrical consumer (200) by means of the communication unit (111),
during the measurement of the setup parameters (MAP), objects possibly arranged over the power coil (101), in particular foreign objects, are detected,
during the measurement of the resonance frequency (MRF), a resonance frequency of a resonant circuit (103) having the power coil (101) is ascertained,
the measurement of the resonance frequency (MRF) is executed immediately before or immediately after the measurement of the setup parameters (MAP) or is executed immediately before or immediately after the data exchange (DAT), and
based on the ascertained resonance frequency, an operating frequency is ascertained using which the power coil (101) is subsequently actuated during the power transfer (LTX).