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US 8,274,174 B2Granted
Circuit arrangement for supplying power to control devices in motor vehicles
AssigneeKNORR-BREMSE Systeme fuer Nutzfahrzeuge GmbH
InventorsThomas Heger, Rainer Bonss
Life of this patent
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Abstract
A circuit arrangement for supplying power to control devices in motor vehicles, having a first power supply line, a first ground line, a second power supply line and a second ground line, characterized in that the first ground line and the second ground line can be connected by a controllable switch, and in that a logic circuit closes the switch when the first ground line is faulty or interrupted.
Claims18
A circuit arrangement for supplying power to a control device in a motor vehicle, comprising:
- a first power supply line coupled to a first voltage source and having a first ground line;
- and
- a second power supply line switchably coupled to a second voltage source via a first switch and having a second ground line;
- wherein the control device includes at least five pins, a controllable switch, and a logic circuit,
- wherein each power supply line and ground line is respectively connected to a respective pin of the control device,
- wherein the logic circuit includes a first control input connected to the second power supply line, a second control input connected to the first ground line, and a third control input connected to the second ground line,
- wherein the first ground line and the second ground line are switchably connected by the controllable switch, and wherein responsive to a closing of the first switch, the logic circuit checks a first voltage difference between the first and the second control inputs, and checks a second voltage difference between the first and the third control inputs and closes the controllable switch when the first voltage difference falls below a threshold value and the second voltage difference corresponds to a voltage difference of an on-board voltage, and
- wherein one of the at least five pins is coupled to a third line when an ignition switch of the motor vehicle is on, so that voltage is applied to the third line.
5 more elements
A circuit arrangement for supplying power to a control device in a motor vehicle, comprising:
- a first power supply line coupled to a first voltage source, and having a first ground line;
- and
- a second power supply line switchably coupled to a second voltage source via a first switch;
- and having a second ground line;
- wherein the control device includes at least five pins, a controllable switch, and a logic circuit,
- wherein each power supply line and ground line is respectively coupled to a respective pin of the control device,
- wherein the logic circuit includes a first control input connected to the second power supply line, a second control input connected to the first ground line, and a third control input connected to the second ground line,
- wherein the first ground line and the second ground line are switchably coupled by the controllable switch, and wherein responsive to a closing of the first switch, the logic circuit checks a first voltage difference between the first and the second control inputs, and checks a second voltage difference between the first and the third control inputs and closes the controllable switch when the first voltage difference falls below a threshold value and the second voltage difference corresponds to a voltage difference of an on-board voltage, and
- wherein a first one of the connection pins is coupled to the first power supply line, wherein a fourth one of the connection pins is coupled to the first ground line, wherein a third one of the connection pins is coupled to a line when an ignition switch of the vehicle is on, so that voltage is applied to the line, wherein a second one of the connection pins is coupled to the second power supply line, and wherein a fifth one of the connection pins is coupled to the second ground line.
6 more elements
Dependencies are inferred from the claim text.