Patent ID: 6483276
Filing Date: 2002-11-19
Classification: G04C

Abstract:
An electronic device, comprising:a mechanical energy source; an electric power generator, driven by said mechanical energy source, for generating electric power by induction and supplying electrical energy; and a rotation controller, driven by the electrical energy, for controlling the rotation period of said electric power generator with one of a strong braking signal and a weak braking signal, said rotation controller comprising: a switch capable of connecting two terminals of said electric power generator in a closed-loop state, a chopping signal generator that generates at least two types of chopping signals which are different in at least either duty ratio or frequency and which direct said rotation controller to apply a strong braking force to said electric power generator according to said strong braking signal, and a chopping signal selector that selects one of the at least two types of chopping signals during said application of said strong braking force to said electric power generator and applies the selected chopping signal to said switch, thereby controlling said electrical power generator in a chopping manner according to the selected chopping signal.