초록 ▼

A rectifying section 2, and a DCDC converter 3 which lowers an input DC voltage and then outputs the voltage are disposed between an AC generator 1 and a load 4. When the output voltage Vt of the AC generator 1 is gradually lowered with starting from E0, the output power P is increased, and is maxim

A rectifying section 2, and a DCDC converter 3 which lowers an input DC voltage and then outputs the voltage are disposed between an AC generator 1 and a load 4. When the output voltage Vt of the AC generator 1 is gradually lowered with starting from E0, the output power P is increased, and is maximum at Vt=V12. When the output voltage Vt is further lowered, the output power P is reduced. As an operating point at which the same output power P is obtained, there are a point of Vt=V11, and that of Vt=V13. The operation of the DCDC converter 3 is controlled so as to operate at the point of Vt=V13 where the output current I is lower.

대표청구항 ▼

1. An electric power supply system comprising; an AC generator for generating a power to supply the power to a load; and controlling means for controlling said AC generator so that said AC generator operates in a current range where an output current is lower than a maximum power output current

1. An electric power supply system comprising; an AC generator for generating a power to supply the power to a load; and controlling means for controlling said AC generator so that said AC generator operates in a current range where an output current is lower than a maximum power output current corresponding to a maximum power operating point of said AC generator; wherein said AC generator has an operating characteristic in which, an output power increases as an output voltage decreases until said output power is maximum at said maximum power operating point, and said output power decreases as said output voltage further decreases; wherein said controlling means performs a control so that a load resistance of said AC generator starts from an initial state, in which the load resistance is substantially equivalent to an open circuit load resistance, and thereafter the load resistance is reduced over time. 2. The electric power supply system according to claim 1, wherein said controlling means comprises: rectifying means for rectifying an output of said AC generator; and DC voltage converting means for lowering an output voltage of said rectifying means and supplying said output voltage to said load, and for performing a feedback control so that an output voltage of said DC voltage converting means coincides with a target voltage. 3. The electric power supply system according to claim 1, wherein said controlling means comprises: rectifying means for rectifying an output of said AC generator; and DC voltage converting means for lowering an output voltage of said rectifying means and supplying said output voltage to said load, and for performing a feedback control so that an output voltage of said voltage converting means coincides with a target voltage. 4. The electric power supply system according to claim 1, wherein said controlling means comprises: rectifying means for rectifying an output of said AC generator; and DC voltage converting means for lowering an output voltage of said rectifying means and supplying said output voltage to said load, and for performing a feedback control so that an output voltage of said voltage converting means coincides with a target voltage. 5. The electric power supply system according to claim 1, wherein said load includes a battery. 6. The electric power supply system according to claim 2, wherein said DC voltage converting means is DCDC converter. 7. The electric power supply system according to claim 2, wherein said DC voltage converting means comprises: a switching element for performing a switching operation; and, a control section for controlling a switching of said switching element according to said output voltage. 8. The electric power supply system according to claim 6, wherein said DC voltage converting means comprises at least one of sensor for detecting an input current and said input current is supplied to said control section. 9. The electric power supply system according to claim 7, wherein said control section controls said switching element by means of a pulse width modulation control.