Motor vehicle electrical system providing multiple DC voltages

Patent · Tue Aug 04 00:00:00 EDT 1987

OSTI ID:6142643

Carlson, R A

This patent describes a multiple DC voltage electrical system for an automotive vehicle, comprising: a three-phase AC generator driven by the engine of the vehicle for producing a three-phase AC voltage across three-phase output windings connected in a wye configuration having a neutral node; means for connecting the neutral node of the wye configured three-phase output windings of the generator to system ground such that the amplitude of the three-phase AC voltage alternately swings between positive and negative polarity in respect to system ground; an undergrounded three-phase full-wave rectifier having a set of input terminals connected with the three-phase output windings of the generator for receiving and rectifying the three-phase AC voltage to develop three distinct DC voltages in respect to a pair of output terminals, the three DC voltages including a first half-wave rectified DC voltage of positive polarity between one output terminal and system ground capable of supplying negative polarity DC voltage loads in the vehicle. A second half-wave rectified DC voltage of negative polarity is between the other output terminal and system ground capable of supplying negative polarity DC voltage loads in the vehicle. A third full-wave rectified DC voltage is between the two output terminals equal to the sum of the first and second half-wave rectified DC voltages capable of supplying a high-power DC voltage load in the vehicle. A storage battery connects between one of the output terminals of the rectifier and system ground for charging from the corresponding one of the positive and negative DC voltages put out by the rectifier and for supplying standby power at the corresponding one of the positive and negative DC voltages; the connection means includes a diode poled to prevent discharge of the battery to system ground through the high-power DC voltage load when the generator is not operative.

• Assignee: General Motors Corp., Detroit, MI
• Patent Number(s): US 4684818
• OSTI ID: 6142643
• Resource Relation: Patent File Date: Filed date 1 Aug 1986
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
VEHICLES
ALTERNATORS
ENGINES
AMPLITUDES
CONNECTORS
DIRECT CURRENT
ELECTRIC BATTERIES
ELECTRIC GROUNDS
ELECTRIC POTENTIAL
RECTIFIERS
SEMICONDUCTOR DIODES
CONDUCTOR DEVICES
CURRENTS
ELECTRIC CURRENTS
ELECTRIC GENERATORS
ELECTRICAL EQUIPMENT
ELECTROCHEMICAL CELLS
EQUIPMENT
SEMICONDUCTOR DEVICES
330603* - Vehicle Design Factors- Engine System
330300 - Advanced Propulsion Systems- Electric-Powered Systems