Energy supply circuit for a motor vehicle on-board electrical system having two voltage supply branches
First Claim
1. An energy supply circuit for a motor vehicle on-board electrical system comprising:
- first and second voltage supply branches having different voltage levels;
a first direct-voltage converter coupled to feed a voltage to the first voltage supply branch from the second voltage supply branch;
a generator coupled to supply a voltage to the second voltage supply branch;
a first energy accumulator which buffers at least said first voltage supply branch; and
a multi-level power distribution element having a first in/output connected with the second voltage supply branch, a second in/output connected with the first voltage supply branch, and a third in/output connected with the first energy accumulator, which multi-level power distribution element provides a variable voltage level on each of said in/outputs at one of three voltage levels, and feeds a variable distribution of the power flows via said multi-level power distribution element between said in/outputs.
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Accused Products
Abstract
In an energy supply circuit for a motor vehicle on-board electrical system with two voltage supply branches at different voltage levels, the first voltage supply branch can be fed by way of an electric direct voltage converter by the second voltage supply branch and the second voltage supply branch can be fed by a generator. A multi-level controller W3 with three voltage levels is provided whose first in/output is connected with the second voltage supply branch, whose second in/output is connected with the first voltage supply branch and whose third in/output is connected with the energy accumulator B1 assigned to the first voltage supply branch.
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Citations
19 Claims
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1. An energy supply circuit for a motor vehicle on-board electrical system comprising:
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first and second voltage supply branches having different voltage levels;
a first direct-voltage converter coupled to feed a voltage to the first voltage supply branch from the second voltage supply branch;
a generator coupled to supply a voltage to the second voltage supply branch;
a first energy accumulator which buffers at least said first voltage supply branch; and
a multi-level power distribution element having a first in/output connected with the second voltage supply branch, a second in/output connected with the first voltage supply branch, and a third in/output connected with the first energy accumulator, which multi-level power distribution element provides a variable voltage level on each of said in/outputs at one of three voltage levels, and feeds a variable distribution of the power flows via said multi-level power distribution element between said in/outputs. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
said multi-level power distribution element includes a power switch in the form of a MosFet, for selectively coupling and uncoupling said first energy accumulator to and from said first voltage supply branch; and
an internal resistance of the power switch is used as a current measuring resistance for charge balancing.
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11. The energy supply circuit according to claim 9, further comprising a communication device provided in the multi-level power distribution element for communication with a power management device for the on-board electrical system.
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12. The energy supply circuit according to claim 1, further comprising a device integrated in the multi-level power distribution element for monitoring and charging said first energy accumulator.
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13. The energy supply circuit according to claim 1, wherein
the multi-level power distribution element comprises a power switch; -
by means of the second direct voltage converter, a power flow can be controlled from the second voltage supply branch to the first energy accumulator; and
by means of the power switch, the first voltage supply branch can be separated from the first energy accumulator and the direct voltage converter.
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14. An energy supply circuit for an electrical system having at least a first voltage supply branch which is energized at a first voltage level, and a second voltage supply branch which is energized at a second voltage level, said energy supply circuit comprising:
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a generator for supplying electric power to said second voltage supply branch at a voltage approximately equal to said second voltage level;
a direct voltage converter for supplying electric power from said second voltage supply branch to said first voltage supply branch at a voltage approximately equal to said first voltage level;
a first electric energy accumulator for buffering said voltage supplied to said first voltage supply branch by said direct voltage converter; and
a multi-level power distribution element for selectively controlling a flow of electric energy between said second voltage supply branch, said first voltage supply branch and said first electric energy accumulator, said multi-level power distribution element selectively coupling and uncoupling said first electric energy accumulator with said first voltage supply branch, and selectively providing a flow of electric energy through said multi-level power distribution element, from said second voltage supply branch to said first electric energy accumulator or to said first voltage supply branch and said first electric energy accumulator. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification