Method for charging a device, device and charger

1. A method, comprising:

connecting a device to a charger;

wirelessly charging the device in a state of charge by wirelessly transferring energy from a transmitter module of the charger to a reception module of the device;

consuming energy with the device in a state of discharge;

providing the device with a charging connector receiving a charging input voltage being adjustable by the charger for charging;

providing the device with a switching connector for turning the device on and off;

providing the device with a switch connected to the switching connector and being switchable by the charging input voltage by setting the charging input voltage to an intermediate voltage;

using the charger to set the charging input voltage to the intermediate voltage for switching the switch and transitioning the device into an off state having the device turned off; and

transferring energy during charging by using a magnetic field, producing the magnetic field by using a transmitter coil of the transmitter module, receiving the magnetic field at a reception coil of the reception module, and driving the transmitter module to induce the intermediate voltage in the device for setting the charging input voltage to the intermediate voltage.

2. A method, comprising:

connecting a device to a charger;

wirelessly charging the device in a state of charge by wirelessly transferring energy from a transmitter module of the charger to a reception module of the device;

consuming energy with the device in a state of discharge;

providing the device with a charging connector receiving a charging input voltage being adjustable by the charger for charging;

providing the device with a switching connector for turning the device on and off;

providing the device with a switch connected to the switching connector and being switchable by the charging input voltage by setting the charging input voltage to an intermediate voltage;

using the charger to set the charging input voltage to the intermediate voltage for switching the switch and transitioning the device into an off state having the device turned off;

completing charging once the charging input voltage drops below a charging threshold voltage; and

transitioning the device into the state of charge from the state of discharge or from the off state when the charging input voltage at least corresponds to the charging threshold voltage.

3. The method according to claim 2 , which further comprises transitioning the device from the state of charge to an idle state when the charging input voltage is less than the charging threshold voltage and transitioning the device from the idle state into the state of discharge when the charging input voltage is less than a reset voltage.

4. The method according to claim 1 , which further comprises:

providing the switch as a transistor including a gate, a source, and a drain;

connecting the gate to the charging connector and pulling the gate up to the charging input voltage by using a resistor;

connecting the gate through the resistor to the source and to ground; and

connecting the drain to the switching connector and connecting the source to ground.

5. The method according to claim 1 , which further comprises:

providing the charger with a converter and an oscillator;

using the oscillator to produce a current for producing the magnetic field by way of the transmitter module;

using the converter to produce a converter voltage for operation of the oscillator; and

setting the charging input voltage by using the converter voltage.

6. The method according to claim 5 , which further comprises:

controlling the converter voltage in dependence on a coupling factor between the transmitter module and the reception module; and

producing the intermediate voltage by setting the converter voltage by initially determining the coupling factor and then using the coupling factor to determine the converter voltage required to produce the intermediate voltage.

7. The method according to claim 6 , which further comprises:

using the device to transmit a last charging input voltage applied to the charger during the charging, as a final charging input voltage;

using the charger to store the current, used for operating the transmitter coil at a time of the final charging input voltage, as a final current; and

receiving the final charging input voltage at the charger, whereupon the coupling factor then is determined in combination with the final current.

8. A method, comprising:

connecting a device to a charger;

wirelessly charging the device in a state of charge by wirelessly transferring energy from a transmitter module of the charger to a reception module of the device;

consuming energy with the device in a state of discharge;

providing the device with a charging connector receiving a charging input voltage being adjustable by the charger for charging;

providing the device with a switching connector for turning the device on and off;

providing the device with a switch connected to the switching connector and being switchable by the charging input voltage by setting the charging input voltage to an intermediate voltage;

using the charger to set the charging input voltage to the intermediate voltage for switching the switch and transitioning the device into an off state having the device turned off;

providing each of the device and the charger with a respective communications unit, for an interchange of data;

using the device to modulate the data for transfer;

using the charger to receive and demodulate the data; and

providing the charger with a demodulator circuit serving to demodulate and being used to additionally determine the current in the transmitter module.

9. The method according to claim 1 , which further comprises providing the charger, in addition to the converter, with a voltage reference circuit for overall producing a converter voltage below a feedback reference voltage of the converter.

10. The method according to claim 1 , which further comprises providing the charger with an emergency energy storage unit to set the intermediate voltage upon an interruption in an energy supply to the charger.

11. A device, comprising means for carrying out the method according to claim 1 .

12. The device according to claim 11 , wherein the device is a hearing aid.

13. A charger, comprising means for carrying out the method according to claim 1 .