HYBRID SYSTEM AND PORTABLE WORK MACHINE PROVIDED WITH SAME

摘要

The present invention makes it possible to simplify a protective mechanism for preventing overcharging of a battery while effectively preventing overcharging of the battery in a hybrid system comprising a configuration in which: an engine and an electric motor are provided as prime movers that drive an object to be driven; and a battery is charged by converting part of the rotational energy of the engine into electrical power. The power unit (3) from which the hybrid system is configured is provided with: an engine (10); an electric motor (70) that is provided so as to be capable of transmitting torque to the output shaft of the engine (10), and that functions as a generator that generates power through rotation of the engine (10); and a battery (110) that is charged using the power generated by the electric motor (70). The electric motor (70) is set so that the voltage generated when functioning as a generator does not surpass the full charge voltage of the battery (110).