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An electrical system for a motor vehicle includes a three-phase AC generator having wye-connected output windings and a three-phase full-wave rectifier. The neutral node of the wye-connected generator is grounded while the rectifier is ungrounded. As a result, three distinct DC voltages are produced

An electrical system for a motor vehicle includes a three-phase AC generator having wye-connected output windings and a three-phase full-wave rectifier. The neutral node of the wye-connected generator is grounded while the rectifier is ungrounded. As a result, three distinct DC voltages are produced: two three-phase half-wave rectified DC voltages of opposite polarity in respect to ground and a three-phase full-wave rectified voltage which is the sum of the other two DC voltages. One of the former lower-magnitude DC voltages may be employed to supply the usual low DC voltage loads of the vehicle while latter higher-magnitude DC voltage may be employed to energize a higher DC voltage load such as a window glass heater element.

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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; connection means for connect

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; connection 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 ungrounded 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 between the other output terminal and system ground capable of supplying negative polarity DC voltage loads in the vehicle, and a third full-wave rectified DC voltage 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; and a storage battery connected 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 including a diode poled so as to prevent discharge of the battery to system ground through the high-power DC voltage load when the generator is not operative.