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Power supply system
| Details |
Inventors: Umeda, Atsushi; Taniguchi, Makoto; Kusase, Shin;
Assignee: Nippondenso Co., Ltd. (Kariya, JP)
Primary Examiner: Nguyen; Matthew V.
Assistant Examiner:
Attorney, Agent or Firm: Cushman, Darby & Cushman IP Group of Pillsbury Madison & Sutro LLP
A power supply system has a three-phase alternating current generator, a storage battery, and a three-phase rectifying device connected between the alternating current generator and the storage battery. The rectifying device includes three SiC-MOSFETS which are turned on when the corresponding alternating voltage is positive and turned off when the corresponding alternating voltage is negative. A duty control device switches each of the three SiC-MOSFETS on and off according to a selected duty ratio so that the alternating current generator can generate an optimum voltage in proportion to a rotational speed of a rotor of the alternating current generator. |
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DETAILED DESCRIPTION The present invention is made in light of the foregoing problems, and it is an object of the present invention to provide a power supply system including a semiconductor switching element which has a high withstand voltage, yet maintains small rectifying losses.
For attaining the above object, the present inventors have examined various semiconductor switching elements in order to find an optimum switching element which can be substituted for a thyristor.
As a result, the inventors have found that a silicon carbon MOSFET (hereinafter, SiC-MOSFET) is the most suitable semiconductor switching element.
A power supply system according to the present invention includes an alternating current generator, a storage battery and a rectifying device connected between the alternating current generator and the storage battery.
The rectifying device rectifies an alternating output from the alternating current generator and supplies the rectified output to the storage battery.
The rectifying device includes a semiconductor switching element which is formed by SiC material.
The power supply system also includes a duty control device for controlling the duty ratio of the semiconductor switching element so that the alternating current generator can generate an alternating voltage set independently from the voltage of the storage battery.
In the power supply system according to the present invention, the semiconductor switching element of the rectifying device is formed by SiC material.
As a result and as described in more detail below, even when a high surge voltage is generated by the current flowing through the semiconductor switching element, the semiconductor switching element can withstand the high surge voltage because of the high withstand voltage characteristic of SiC material.
Therefore, since the power supply system is not damaged by surge voltages, the reliability of the system can be enhanced.
In addition, as described in more detail below, because the semiconductor switching element is formed by SiC material, the ON resistance is much lower than that of a semiconductor switching element formed by Si material
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Electrical and Wave 
