Braun Gmbh

The Procter Gamble Company

Ferdinand Hermann

Torsten Klemm

Andreas Erndt

Timo Schmitt

Thomas Steiner

Pedro Sanchez Martinez

Thomas Hohmann

Lorraine Rispal

Lars Gerlach

The present invention relates to the field of a small electrical appliance, in particular hair removal device or toothbrush, comprising an electric DC motor; a detector for acquiring a detector signal indicative of a rotational speed of the electric DC motor; and a controller for controlling the electric DC motor. The controller is adapted to: determine, based on the detector signal, a first parameter indicative of the rotational speed of the DC motor; determine, based on the detector signal, a second parameter indicative of the rotational speed of the DC motor, wherein the second parameter is different from the first parameter, and wherein the second parameter is determined based on a frequency domain analysis of the detector signal; and adjust a supply voltage of the electric DC motor based on the first parameter and the second parameter.

Small electrical appliance with improved motor speed control

The present invention relates to the field of battery powered electrical appliances or personal hygiene, in particular to a hair removal device such as an electric shaver or epilator as well as an electric toothbrush. A control device for a battery powered electrical appliance for personal hygiene is described, wherein the control device is adapted to cause the battery powered electrical appliance to perform automated contact fritting of a battery contact by controlling the battery powered electrical appliance such that a current pulse exceeding a wetting threshold is applied across the battery contact during a standby period.

Battery powered electrical appliance for personal hygiene

A cosmetic device with an exchangeable application head and a device body, wherein the device body contains a motor and drive mechanism, an actuating switch, a power supply, a head recognition element and a control element adapted to control the motor and drive mechanism based on an actuation of the actuation switch and the application head recognized by the head recognition element. It is provided that the head recognition element comprises at least one mechanical switch disposed on a carrier fixed at the device body. Further, a flexible actuation area is disposed in front of the at least one mechanical switch. The exchangeable application head has at least one recognition generating protrusion actuating through the flexible actuation area on one of the at least one mechanical switches when the exchangeable application head is mounted at the device body.

Cosmetic device with exchangeable application head

An electrical circuit for charging a secondary battery that comprises a dc-converter and an output connector that can be connected to the positive terminal of the secondary battery for applying a charging current to the secondary battery. The dc-converter has a voltage feedback connector for sensing a feedback voltage, wherein the dc-converter is adapted to regulate the output voltage by adjusting the output current at the output connector depending on the sensed feedback voltage and a feedback-sub-circuit connected to the output connector and to the voltage feedback connector of the dc-converter.

Electrical circuit and method for charging a secondary battery

An electronic circuit and method for measuring currents during charging and discharging of a secondary battery are disclosed having a secondary battery, at least one shunt for determining the electrical current during charging and/or discharging of the secondary battery by measuring the voltage drop over the shunt, a switchable electrical load, two connectors for connecting a preferably switchable power supply to the electronic circuit for charging the secondary battery and a voltage measuring device. A first shunt is connected in series between the electrical load and the secondary battery, and a second shunt is connected in series between one of the two connectors for connecting the power supply and the secondary battery, wherein the first shunt and the second shunt are connected to the same one of the two battery terminals of the secondary battery, and in that the voltage measuring device comprises only one voltage tapping connected to the electrical conduit between the first shunt and the switchable electrical load and measuring the electrical potential with respect to ground, as defined by the ground potential of the voltage measuring device.

Growing community of inventors

Koenigstein, Germany

Ferdinand Hermann