Robert Boschgmbh

Joerg Koniakowsky

Stefan Aldinger

Tobias Richter

Stefan Mock

A DC-DC converter system (') according to the invention is provided with an input (In) for feeding in an input voltage (U_in), a step-up controller section () for increasing the input voltage (U_in) in a controlled manner to a controlled first output voltage (U_out) and for providing the first output voltage (U_out) at a first supply output (Out), and a voltage conversion section () for converting the input voltage (U_in) into a second output voltage (U_out) in a manner controlled by a control device of the step-up controller section () and for providing the second output voltage (U_out) at a second supply output (Out). The DC-DC converter system () according to the invention having two supply outputs (Out, Out) is based on an expansion of a step-up controller with a SEPIC circuit, wherein the DC-DC converter system comprises only a single control device (S) and a switching device (T) which can be controlled by the control device.

DC-DC converter system, DC voltage supply system and printed circuit board for a DC-DC converter system

A method for regulating a speed of an electric motor of a power tool, the speed of the electric motor being established as a function of an actuation of a control device, the control device being actuated in such a way that a speed is requested which is less than a maximum speed, the speed being set in such a way that, in a first speed range upon an increase of the torque output by the electric motor, the speed decreases with a first negative slope, the speed being set in a second speed range in such a way that the speed proceeds with a second slope upon an increase of the output torque, the second slope being greater than the first slope when considered mathematically.

Method for regulating a speed of an electric motor of a power tool

The invention relates to a device and to a method for determining a voltage. The voltage to be determined is a direct voltage at the input of a flyback converter. The flyback converter comprises at least a flyback-converter transformer and a switching element on the primary side of the flyback-converter transformer. In order to determine the voltage at the input of the flyback converter, a voltage on the secondary side of the flyback-converter transformer is sensed and evaluated in correlation with the switching state of the switching element on the primary side.

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Ostfildern, Germany

Joerg Koniakowsky