Electrical transmission or interconnection systems – Vehicle mounted systems
Reexamination Certificate
2000-05-30
2001-11-20
Ballato, Josie (Department: 2836)
Electrical transmission or interconnection systems
Vehicle mounted systems
C307S029000, C307S085000
Reexamination Certificate
active
06320274
ABSTRACT:
FIELD OF AND BACKGROUND OF THE INVENTION
The invention concerns an onboard electrical system for a vehicle. Onboard electrical systems of this kind serve in particular to connect power consuming components to onboard electrical system energy storage, in particular a battery and an onboard electrical system generator of energy, and to a starter-generator which can be coupled to the internal combustion engine of the vehicle. In the event that high-current consuming components are connected to the onboard electrical system as well, it is advantageous, for purposes of minimizing losses, to provide a second voltage for their supply that is higher than a first battery-side voltage.
German Laid-Open Publication DE 37 43 317 A1 describes a vehicle onboard electrical system with a starter-generator that is connected via a pulse-width-modulated inverter and a 300-volt DC intermediate circuit and/or bidirectional converter to a 24-volt ring network and a 24-volt battery having a receptacle for 220 volts, 50 Hz voltage.
OBJECTS OF THE INVENTION
One object of the present invention is to provide a second onboard electrical system voltage as inexpensively as possible with respect to hardware and software.
SUMMARY OF THE INVENTION
According to one formulation of the invention, this and other objects are achieved by the onboard electrical system of the present invention, which includes a switching or connection device with only one step-up switching regulator.
The onboard electrical system, utilizing the switching or connection device and the step-up switching regulator, both charges a start capacitor with an appropriately high voltage and supplies a second onboard electrical subsystem with voltage from the battery. Furthermore, while the starter-generator is in generator mode, the onboard electrical system regulates a converter assigned to the starter-generator through appropriate regulation of the converter to supply the second onboard electrical system with a voltage which is higher than the battery voltage and which is stepped down with respect to the voltage of the starter-generator. Advantageously, the start capacitor is then employed in generator mode as an intermediate circuit capacitor.
The electrical switching or connecting device comprises particularly inexpensive switching technology. Structurally, the electrical switching or connecting device consists of three connections. The first connection is between the first onboard electrical subsystem and the third onboard subsystem with blocking in the return direction. The second connection is between the first onboard electrical subsystem and the second onboard electrical subsystem with blocking in the return direction, and the second connection is enabled only during supply of power from the first onboard electrical subsystem to the second onboard electrical subsystem. The third connection is between the third onboard electrical subsystem and the second onboard electrical subsystem, and is enabled only during supply of power from the third onboard electrical subsystem to the second onboard electrical subsystem. Advantageously, diodes are provided for blocking the electrical path in the return direction. Also advantageously, a thyristor or transistor, in particular an IGBT, is provided for controlling (on/off switching) the individual switchable connections.
With slight additional switching and control technology expenditure, a recharging or supply of the first onboard electrical subsystem from the starter-generator can be achieved in generator mode of operation, whereby the first onboard electrical subsystem is connected to the second onboard electrical subsystem via a step-down switching regulator. In this case, power flow occurs from the starter-generator, through the converter with the intermediate circuit capacitor, and across the connection between the third onboard electrical subsystem and the second onboard electrical subsystem. The subsequent connection of the second onboard electrical subsystem occurs across the step-down switching regulator to the first onboard electrical subsystem. The starter capacitor, provided for starting the starter-generator, is used as the intermediate circuit capacitor.
REFERENCES:
patent: 4672294 (1987-06-01), Norton
patent: 4723079 (1988-02-01), Norton
patent: 5175439 (1992-12-01), Harer et al.
patent: 5334926 (1994-08-01), Imaizumi
patent: 5998976 (1999-12-01), Steffan
patent: 37 43 316 A1 (1989-06-01), None
patent: 37 43 317 A1 (1989-06-01), None
patent: 43 10 240 A1 (1993-10-01), None
Goetze Thomas
Johanning Hans-Peter
Schaefer Heinz
Ballato Josie
Polk Sharon
Siemens AG
Sughrue Mion Zinn Macpeak & Seas, PLLC
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