Power-supply circuit supplied by at least two different input voltage sources

US6150799A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Michael Barth · Stuttgart, DE
• Dietmar Koehler · Wolfschlugen, DE
• Andrea Meroth-Lienkamp · Reutlingen, DE
• Bernd Mueller · Leonberg, DE
• Steffen Lacher · Ansbach, DE

Key dates

• Filing date: Aug 27, 1999
• Grant date: Nov 21, 2000
• Expiry date: Aug 27, 2019

Classification

• Technology area (CPC H): Electricity
• CPC primary: H02J1/108
• WIPO field: Control
• WIPO sector: Instruments

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.