Patent ID: 6934854

Claim:
An electronic circuit for protecting electronic devices, comprising: a first component and a second component each having an electrical variable of the same type; a third component for comparing values of the electrical variable of the first component and of the second component with one another; a setting device for setting a value of the electrical variable of said first component and of said second component; a matching device for matching the value of the electrical variable of the first component to the value of the electrical variable of the second component, starting from a basic value, and during a given period of time; a checking device for checking whether an authorized use of the electronic device is properly initiated, executed, and terminated, and, in case of unauthorized or improper use, said checking device bringing about a change in the value of the electrical variable of the second component or a change in the matching device such that the period of time necessary to match the value of the electrical variable of the first component to the value of the electrical variable of the second component by the matching device is prolonged.