Power supply unit for a vehicle electrical system of a motor vehicle

Patent metadata

Field	Value
Publication number	US-9409484-B2
Application number	US-201113811546-A
Country	US
Kind code	B2
Filing date	Jul 13, 2011
Priority date	Jul 22, 2010
Publication date	Aug 9, 2016
Grant date	Aug 9, 2016

Abstract

An improved power supply unit for a vehicle electrical system of a motor vehicle, which has an a.c. generator, that provides a phase signal, having an excitation coil, a field regulator assigned to the excitation coil and a rectifier having rectifier elements for the rectification of the generator voltage supplied by the a.c. generator. The field regulator has a voltage detection range for the evaluation of the phase signal having a minimum value and a maximum value, the maximum value being adjusted to the nominal voltage of a power supply unit of the motor vehicle.

First claim

What is claimed is:

1. A power supply unit for an electrical system of a motor vehicle, which has an a.c. generator that provides a phase signal, comprising:
an excitation coil;
a field regulator assigned to the excitation coil; and
a rectifier having rectifying elements to rectify a generator voltage supplied by the a.c. generator;
wherein:
the field regulator has a voltage detection range for evaluating the phase signal having a minimum value and a maximum value, and
the maximum value is adjusted to a nominal voltage of a power supply unit of the motor vehicle.

2. The power supply unit of claim 1 , wherein the maximum value is adjusted to the nominal voltage of one of the a.c. generator and a starter battery, which is for starting the motor vehicle.

3. The power supply unit of claim 1 , wherein the maximum value corresponds at least to a value which is in a range of 85% to 100% of the nominal voltage.

4. The power supply unit of claim 1 , wherein the minimum value corresponds at most to a value which is in a range of 0% to 15% of the nominal voltage.

5. The power supply unit of claim 1 , wherein the field regulator includes an analog/digital converter, which has a voltage detection range for evaluating the phase signal using the minimum value and the maximum value.

6. The power supply unit of claim 1 , wherein the rectifier elements are configured as trench elements.

7. The power supply unit of claim 1 , wherein the rectifier elements include at least one of a Schottky diode, a TMBS diode, a TJBS diode, and a lambda diode.

8. A power supply unit for an electrical system of a motor vehicle, which has an a.c. generator that provides a phase signal, comprising:
an excitation coil;
a field regulator assigned to the excitation coil; and
a rectifier having rectifying elements to rectify a generator voltage supplied by the a.c. generator;
wherein:
the field regulator has a voltage detection range for evaluating the phase signal having a minimum value and a maximum value, and
the maximum value is adjusted to a nominal voltage of one of the a.c. generator and a starter battery connected to the a.c. generator.

9. The power supply unit of claim 8 , wherein the maximum value is adjusted to a nominal voltage of the starter battery, and wherein the field regulator evaluates the phase signal and controls the excitation coil accordingly during a time when a voltage from the starter battery overlaps with the phase signal.

10. The power supply unit of claim 9 , wherein the voltage overlapping the phase signal is a d.c. voltage of the starter battery and is passed into the a.c. generator through the rectifier elements.

Assignees

• Wolf Gert
• Einbock Stefan
• Jaros Rolf
• Suelzle Helmut
• Bosch Gmbh Robert

Inventors

• Wolf Gert
• Einbock Stefan
• Jaros Rolf
• Suelzle Helmut

Classifications

• H02P9/48

  Arrangements for obtaining a constant output value at varying speed of the generator, e.g. on vehicle (H02P9/04 - H02P9/46 take precedence) · CPC title

• H02P9/305 Primary

  controlling voltage (H02P9/302 takes precedence) · CPC title

• B60L50/12 Primary

  using AC generators and DC motors · CPC title

• B60L11/06 Primary

  Operations & Transport · mapped topic