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US 5,694,311 AGranted
Power supply system
AssigneeNippondenso Co., Ltd.
InventorsAtsushi Umeda, Makoto Taniguchi, Shin Kusase
Life of this patent
Estimating the term…
Abstract
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.
Claims29
A power supply system comprising:
- an alternating current generator;
- a storage battery;
- a rectifying device connected between said alternating current generator and said storage battery for rectifying alternating voltage from said alternating current generator and supplying rectified voltage to said storage battery, said rectifying device including a semiconductor switching element formed by SiC material;
- a smoothing circuit connected between said rectifying device and said storage battery, for smoothing current based on said rectified voltage to be supplied to said storage battery;
- and
- duty control means for switching said semiconductor switching element on and off according to a duty ratio, wherein said alternating current generator can generate an alternating voltage set independently from a voltage of said storage battery.
3 more elements
A power supply system comprising:
- an alternating current generator;
- a storage battery;
- a first rectifying device connected between said alternating current generator and said storage battery for rectifying alternating voltage from said alternating current generator and supplying rectified voltage to said storage battery, said first rectifying device including a first semiconductor switching element formed by SiC material;
- a second rectifying device connected to said alternating current generator for rectifying alternating voltage from said alternating current generator and supplying rectified voltage, said second rectifying device including a second semiconductor switching element formed by SiC material;
- and
- duty control means for switching said first and second semiconductor switching elements on and off according to respective duty ratios.
3 more elements
A power supply system comprising:
- a multi-phase alternating current generator;
- a storage battery;
- a first electrical load connected in parallel to said storage battery;
- a second electrical load;
- a first multi-phase rectifying device connected between said multi-phase alternating current generator and said storage battery for performing a rectification of a multi-phase alternating voltage from said multi-phase alternating current generator and supplying rectified voltage to said storage battery and said first electrical load, said first multi-phase rectifying device including a first high side half bridge circuit and a low side half bridge circuit, said first high side half bridge circuit including a plurality of SiC-MOSFETS which are connected to output lines of said multi-phase alternating current generator, respectively, and are turned on or off depending on a sign of a corresponding alternating voltage in order to rectify said multi-phase alternating voltage;
- a second multi-phase rectifying device connected between said multi-phase alternating current generator and said second electrical load for performing a rectification of a multi-phase alternating voltage from said multi-phase alternating current generator and supplying rectified voltage to said second electrical load, said second multi-phase rectifying device including a second high side half bridge circuit and said low side half bridge circuit, said second high side half bridge circuit including a plurality of SiC-MOSFETS which are connected to output lines of said multi-phase alternating current generator, respectively, and are turned on or off depending on a sign of a corresponding alternating voltage in order to rectify said multi-phase alternating voltage;
- duty control means for switching each of said SiC-MOSFETS in said first and second high side half bridge circuits on and off according to respective duty ratios, thereby performing duty control.
4 more elements
A power supply system comprising:
- a multi-phase alternating current generator;
- a storage battery;
- a first electrical load connected in parallel to said storage battery;
- a second electrical load;
- a first multi-phase rectifying device connected between said multi-phase alternating current generator and said storage battery for performing a rectification of a multi-phase alternating voltage from said multi-phase alternating current generator and supplying rectified voltage to said storage battery and said first electrical load, said first multi-phase rectifying device including a first high side half bridge circuit and a low side half bridge circuit, wherein said first high side half bridge and said low side half bridge circuits form first circuits to rectify said multi-phase alternating voltage, each of said first circuits including at least one SiC-MOSFET;
- a second multi-phase rectifying device connected between said multi-phase alternating current generator and said second electrical load for performing a rectification of said multi-phase alternating voltage from said multi-phase alternating current generator and supplying rectified voltage to said second electrical load, said second multi-phase rectifying device including a second high side half bridge circuit and said low side half bridge circuit, wherein said second high side half bridge and said low side half bridge circuits form second circuits to rectify said multi-phase alternating voltage, each of said second circuits including at least one SiC-MOSFET;
- and
- duty control means for switching each of said SiC-MOSFETS in said first and second circuits on and off according to respective duty ratios, thereby performing duty control.
5 more elements
A power supply system comprising:
- a multi-phase alternating current generator;
- a storage battery;
- a multi-phase rectifying device connected between said multi-phase alternating current generator and said storage battery for rectifying an alternating voltage from said multi-phase alternating current generator and supplying rectified voltage to said storage battery;
- a SiC-MOSFET connected between said multi-phase rectifying device and said storage battery, capable of alternately passing and blocking said rectified voltage to said storage battery;
- and
- duty control means for switching said SiC-MOSFET on and off according to a duty ratio.
3 more elements
Dependencies are inferred from the claim text.