Patent ID: 7336048

Claim:
A method of operating a power tool with an energy accumulator which supplies power to an electric drive motor, comprising the steps of generating a clock frequency by an electronic unit; with the generated clock frequency; switching on a gate of a MOSFET which supplies operating voltage to the drive motor; carrying out the switching on of the gate of the MOSFET during a cycle of each pulse of the clock frequency; sensing an electric current from the energy accumulator; sensing a power loss of an element selected from the group consisting of the energy accumulator, the drive motor, and both; sensing a temperature of the energy accumulator; sensing an electric voltage of the energy accumulator; switching off the MOSFET during the cycle of each pulse of the clock frequency by any of a number of signals depending on different operating parameters which include a maximum permissible electric current, a maximum permissible power loss of the element selected from the group consisting of the energy accumulator, the drive motor, and both, a maximum permissible temperature of the energy accumulator, and a minimum permissible electric voltage.