Circuit configuration for generating a stabilized power supply voltage

• US 6,249,110 B1
• Filed: 04/13/2000
• Issued: 06/19/2001
• Est. Priority Date: 04/16/1999
• Status: Expired due to Term

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Geyer, Hans, Spichale, Thomas
• Primary Examiner(s): Wong, Peter S.
• Assistant Examiner(s): Vu, Bao Q.
• Application Number:
  US09/549,112
• Time in Patent Office: 432 Days
• Field of Search: 323/268, 323/269, 323/271, 323/272
• US Class Current: 323/272
• CPC Class Codes: G05F 1/56 using semiconductor devices in series with the load as final control devices G05F1/461 takes precedence
• CPC Class Codes: H02M 1/0045 Converters combining the concepts of switch-mode regulation and linear regulation, e.g. linear pre-regulator to switching converter, linear and switching converter in parallel, same converter or same transistor operating either in linear or switching mode

Abstract

In a circuit configuration for generating a stabilized power supply voltage, an in-phase regulator LR and a switched-mode regulator SR are connected in parallel to one another and are between terminal A1 where the input voltage is supplied and terminal A2 where stabilized output voltage UA is obtained. The regulators are adjusted so that in the normal case, the output voltage of switched-mode regulator SR is slightly higher than that of in-phase regulator LR.

Claims

1. A circuit configuration for generating a stabilized power supply voltage for an electronic consumer in a motor vehicle, comprising:

an input terminal;

an output terminal; and

a voltage regulator receiving an input voltage supplied at the input terminal and providing, at the output terminal, a regulated output voltage to supply the consumer, the voltage regulator including an in-phase regulator and a switched-mode regulator coupled in parallel to one another, a predefined potential difference being obtained between an output voltage of the in-phase regulator and an output voltage of the switched-mode regulator.

2. The circuit configuration according to claim 1, wherein an output voltage of the in-phase regulator is lower than an output voltage of the switched-mode regulator, and wherein the potential difference is about 0.3V.

3. The circuit configuration according to claim 1, wherein the in-phase regulator is an integrated voltage regulator with a 5V output voltage, and wherein the switched-mode regulator has a control voltage set at about 5.3V.

4. The circuit configuration according to claim 1, wherein the circuit configuration is contained in an automotive electrical system, the input voltage is one of a battery voltage and an on-board voltage, the regulated output voltage supplies power to an on-board consumer, and wherein the on-board consumer includes one of a controller and an automotive PC.