Overvoltage protection for a multivoltage vehicle electrical system
2 Assignments
0 Petitions
Accused Products
Abstract
An overvoltage protection circuit for a first subsystem of a multivoltage vehicle electrical system, in which the first subsystem having a first vehicle electrical system voltage, a second subsystem having a second vehicle electrical system voltage, and an electric machine for supplying the second subsystem. The first system voltage is less than the second system voltage. The overvoltage protection circuit includes a first ground connection for connecting a shared ground potential of the first subsystem, the second subsystem, and the electric machine, an additional second ground connection for connecting a reference ground potential, and a control connection for controlling the electric machine. The overvoltage protection circuit checks whether a ground differential voltage between the first and second ground connections reaches a threshold value, and for reducing the second vehicle electrical system voltage when the ground differential voltage between the first and second ground connections reaches the threshold value.
14 Citations
30 Claims
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1-15. -15. (canceled)
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16. An overvoltage protection circuit for a first subsystem of a multivoltage vehicle electrical system, comprising:
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an overvoltage protection circuit arrangement configured to check whether a ground differential voltage between a first ground connection and a second ground connection reaches a threshold value, and for reducing a second vehicle electrical system voltage when the ground differential voltage between the first ground connection and the second ground connection reaches the threshold value; wherein the vehicle electrical system includes the first subsystem having a first vehicle electrical system voltage, a second subsystem having the second vehicle electrical system voltage, and an electric machine for supplying the second subsystem, the first vehicle electrical system voltage being less than the second vehicle electrical system voltage, and includes a first ground connection for connecting a shared ground potential of the first subsystem, the second subsystem, and the electric machine, and an additional second ground connection for connecting a reference ground potential, and a control connection for controlling the electric machine.
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23. A multivoltage vehicle electrical system, comprising:
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a first subsystem having a first vehicle electrical system voltage; a second subsystem having a second vehicle electrical system voltage; an electric machine for supplying the second subsystem, wherein the first vehicle electrical system voltage is less than the second vehicle electrical system voltage; and an overvoltage protection circuit configured to check whether a ground differential voltage between a first ground connection and a second ground connection reaches a threshold value, and for reducing the second vehicle electrical system voltage when the ground differential voltage between the first ground connection and the second ground connection reaches the threshold value; wherein the vehicle electrical system includes the first ground connection for connecting a shared ground potential of the first subsystem, the second subsystem, and the electric machine, and an additional second ground connection for connecting a reference ground potential, and a control connection for controlling the electric machine, and wherein the first ground connection of the overvoltage protection circuit is connected to a shared ground potential of the first subsystem, the second subsystem, and the electric machine, and the second ground connection is connected to a reference ground potential.
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24. A method for protecting a first subsystem of a multivoltage vehicle electrical system from an overvoltage, the method comprising:
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reducing the second vehicle electrical system voltage when a ground differential voltage between a shared ground potential of the first subsystem, a second subsystem, and an electric machine and a reference ground potential reaches a threshold value; wherein the vehicle electrical system includes the first subsystem having a first vehicle electrical system voltage, the second subsystem having a second vehicle electrical system voltage, and the electric machine for supplying the second subsystem, the first vehicle electrical system voltage being less than the second vehicle electrical system voltage. - View Dependent Claims (25, 26, 27, 28)
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29. A computer readable medium having a computer program, which is executable by a processor, comprising:
a program code arrangement having program code for protecting a first subsystem of a multivoltage vehicle electrical system from an overvoltage, by performing the following; reducing the second vehicle electrical system voltage when a ground differential voltage between a shared ground potential of the first subsystem, a second subsystem, and an electric machine and a reference ground potential reaches a threshold value; wherein the vehicle electrical system includes the first subsystem having a first vehicle electrical system voltage, the second subsystem having a second vehicle electrical system voltage, and the electric machine for supplying the second subsystem, the first vehicle electrical system voltage being less than the second vehicle electrical system voltage. - View Dependent Claims (30)
Specification