Power-supply circuit supplied by at least two different input voltage sources
AssigneeRobert Bosch GmbH
InventorsMichael Barth, Dietmar Koehler, Andrea Meroth-Lienkamp, Bernd Mueller, Steffen Lacher
Life of this patent
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Abstract
A power-supply circuit which makes available a voltage that is obtained from at least two input-voltage sources. Connected to each input-voltage source is a current mirror which makes a current available at a control input of an output transistor joint output transistor is connected, via decoupling diodes to the input-voltage sources. Decoupling of input-voltage sources is assured by output transistors which are interconnected at output. The power-supply circuit induces a small voltage difference between the output of the power-supply circuits and the voltage of the determining input-voltage source.
Claims12
A power-supply circuit, comprising:
- an output transistor;
- decoupling diodes;
- a current source generating a source current;
- at least two input-voltage sources interconnected at the output transistor via the decoupling diodes;
- and
- a plurality of current mirrors, an input of each of the current mirrors being coupled to a respective one of the at least two input-voltage sources, each of the current mirrors providing a respective output mirror current at a control input of the output transistor using the source current.
A power-supply circuit, comprising:
- a plurality of output transistors, each of the output transistors including a control input;
- a current source generating a source current;
- a plurality of current mirrors;
- and
- at least two input-voltage sources interconnected at an output of the power-supply circuit via the output transistors, each of the output transistors being allocated to a respective one of the input-voltage sources, an input of a respective one of the current mirrors being coupled to the respective one of the input-voltage sources, each one of the current mirrors providing a respective output mirror current at the control input of the respective one of the output transistors which is allocated to the respective one of the input-voltage sources coupled to the input of the one of the current mirrors.
Dependencies are inferred from the claim text.