Vehicular electric power system
First Claim
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1. A vehicular electric power system comprising:
- a rotating AC machine having a rotor, and polyphase armature coils that generate polyphase voltages as said rotor rotates;
a rectifier connected across said armature coils and a battery unit for rectifying generated voltages, said rectifier composed of a plurality of bridge-connected-SiC-MOSFETs to give a rectified output to said battery unit; and
a control means connected to said SiC-MOSFETs for selectively turning on said SiC-MOSFETs to control said rectifier to rectify said generated voltages, wherein said control means comprises a control unit for controlling said SiC-MOSFETs to perform short-circuiting and open-circuiting of said armature coils, thereby generating additional rectified output provided to said battery unit.
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Abstract
A vehicular electric power system is composed of a rotating AC machine having polyphase armature coils, a full-wave rectifier for rectifying the generated voltages by a plurality of SiC-MOSFETs to give a rectified output to the battery unit, and a control device for selectively turning on the plurality of SiC-MOSFETs to raise the generated voltages by short-circuiting and open-circuiting the armature coils on the basis of the phases of voltages generated by the rotating AC machine at a predetermined duty factor.
53 Citations
8 Claims
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1. A vehicular electric power system comprising:
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a rotating AC machine having a rotor, and polyphase armature coils that generate polyphase voltages as said rotor rotates; a rectifier connected across said armature coils and a battery unit for rectifying generated voltages, said rectifier composed of a plurality of bridge-connected-SiC-MOSFETs to give a rectified output to said battery unit; and a control means connected to said SiC-MOSFETs for selectively turning on said SiC-MOSFETs to control said rectifier to rectify said generated voltages, wherein said control means comprises a control unit for controlling said SiC-MOSFETs to perform short-circuiting and open-circuiting of said armature coils, thereby generating additional rectified output provided to said battery unit. - View Dependent Claims (2, 3, 4, 5)
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6. A vehicular electric power system including a battery unit comprising:
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an AC generator having a field coil and polyphase armature coils for generating polyphase output voltages; a rectifier having a high-side half bridge circuit and a low-side half bridge circuit and connected between said armature coils and a battery unit for supplying a rectified output voltage of said AC generator to said battery unit, said high-side and low-side bridge circuits comprising a plurality of SiC-MOSFETs; a field current supplying means connected to said field coil; and a control means, having a microcomputer connected to said field coil supplying means and a logic gate circuit connected between said microcomputer and said SiC-MOSFETs, for controlling said SiC-MOSFETs to supply said rectified output voltage;
wherein said microcomputer controls said SiC-MOSFETs to perform short-circuiting and open-circuiting of said armature coils, thereby supplying additional rectified output voltage to said battery unit. - View Dependent Claims (7, 8)
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Specification