Patent ID: 8102682

Claim:
A shrink attachment for tools, comprising an induction coil heating the shrink attachment by generating Eddy currents and/or by generating heat from the change of magnetization, and a circuit comprising: a rectifier, having an input for feeding an input power, and a rectifier output, an inverter for putting out an AC-voltage, having an input and an inverter output for connecting the induction coil, an intermediary circuit for connecting the rectifier to the inverter, and a regulation unit for regulating the power supplied to the induction coil, wherein the circuit for controlling comprises a measurement apparatus for measuring only current supplied to the induction coil as an input variable for the regulation unit, wherein the measurement apparatus is connected to the output side of the inverter, wherein the current supplied to the induction coil is used as an input variable for the regulation of the power supplied to the induction coil.