Patent ID: 7081738

Claim:
A generating device comprising: a magneto generator having a magnet rotor and a stator with an n-phase armature coil (n is an integer equal to or more than one); voltage storage means; an n-phase diode bridge full-wave rectifier circuit that converts an AC output of said magneto generator into a DC output to apply the DC output to said voltage storage means; an n-phase bride type inverter circuit in which each branch of a bridge is constituted by switch elements, said voltage storage means is connected between DC terminals, and an AC terminal is connected to an output terminal of said magneto generator; and a controller that controls the switch elements of said inverter circuit so as to keep the output of said magneto generator at a target value, a load being connected across said voltage storage means, wherein said controller comprises: chopper control means that controls on/off of a part of the switch elements that constitute said inverter circuit so as to interrupt a current passing from said magneto generator through said rectifier circuit with a predetermined duty ratio to control to keep the output of said magneto generator at the target value; drive control means that controls the switch elements that constitute said inverter circuit so as to apply an AC control voltage having the same frequency as a no-load induced voltage of said armature coil from said voltage storage means through said inverter circuit to said armature coil, and changes a phase angle of said AC control voltage to control to keep the output of said magneto generator at the target value; and control mode switching means that switches a control mode from a chopper control mode to a drive control mode and from the drive control mode to the chopper control mode according to a control mode switching condition that is at least a rotational speed of said magneto generator, so that control by said chopper control mode is performed when said rotational speed of said magneto generator is low, and control by said drive control mode is performed when the rotational speed of said magneto generator is high, said chopper control mode being a control mode where control to keep the output of said magneto generator at the target value is performed by said chopper control means, and said drive control mode being a control mode where control to keep the output of said magneto generator at the target value is performed by said drive control means.