| 摘要 |
<p>PURPOSE:To prevent an overvoltage when a battery is open by a method wherein, when a voltage from a permanent-magnet-type AC generator is a prescribed voltage or higher, a switching element (e.g. a thyristor) is set to continuity. CONSTITUTION:An output current i1 from a permanent-magnet-type AC generator ACG charges a capacitor C. At this time, since the output impedance of the generator ACG is comparatively large, the capacitor C is not charged up to the peak voltage of the generator ACG at one cycle. Then, the electric charge of the capacitor C is discharged to a load L. When the electric charge reaches a voltage which is lower than the voltage VZ of a Zener diode DZ, a thyristor S is set to continuity and an output from the generator ACG is supplied to the capacitor C and the load L. This operation is repeated, the thyristor S is turned on and off repeatedly, and the voltage Vc of the capacitor C, i.e., the voltage of the load L, does not become an overvoltage. Thereby, it is possible to prevent an overvoltage when a battery B for the permanent-magnet-type AC generator ACG is open.</p> |
