Power supply circuit for motor vehicles

• US 5,175,439 A
• Filed: 08/26/1991
• Issued: 12/29/1992
• Est. Priority Date: 12/21/1987
• Status: Expired due to Term

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Harer, Helmut, van Wyk, Jd, Henneberger, Gerhard
• Primary Examiner(s): Voeltz, Emanuel T.
• Application Number:
  US07/750,873
• Time in Patent Office: 491 Days
• Field of Search: 363/36, 363/37, 363/125, 363/126, 320/61, 320/64, 320/65, 320/66, 320/67, 320/68, 320/32, 320/43, 322/4.7, 322/10-17, 322/28, 307/9.1, 307/10.1, 307/10.7, 307/11, 307/13, 307/18, 307/19, 307/20, 307/22, 307/24, 307/28, 307/29, 307/75, 307/76, 307/78, 307/82, 307/84
• US Class Current: 307/10.1
• CPC Class Codes: B60R 16/03 for supply of electrical power to vehicle subsystems or for circuit arrangements for charging batteries H02J7/00
• CPC Class Codes: F02N 11/0862 characterised by the electrical power supply means, e.g. battery
• CPC Class Codes: F02N 2011/0885 Capacitors, e.g. for additional power supply
• CPC Class Codes: F02N 2011/0888 DC/DC converters
• CPC Class Codes: F02N 2011/0896 Inverters for electric machines, e.g. starter-generators
• CPC Class Codes: H02M 7/4807 having a high frequency intermediate AC stage
• CPC Class Codes: H02P 2201/07 DC-DC step-up or step-down converter inserted between the power supply and the inverter supplying the motor, e.g. to control voltage source fluctuations, to vary the motor speed

Abstract

A novel vehicle power supply system is suggested which receives its voltage supply from a starter/generator which can be used as a generator in normal operation and as a starter when starting, wherein the starter/generator is connected with a 24 volt ring mains as well as with a 24 volt battery via a pulse inverter and a 300 volt DC intermediate circuit and a bidirectional converter. Additional consumers can be supplied with higher voltages than 24 volts and electric control devices can be supplied with voltage, possible via additional converters, from the bidirectional push-pull converter and the 300 volt DC intermediate network. In addition, this vehicle power supply system contains a plug receptacle with a 220 volt 50 Hz voltage.

Claims

1. A motor vehicle power supply circuit with a plurality of power supply components, comprising a motor vehicle power supply voltage including a battery;

a starter/generator;

a DC voltage intermediate circuit having an increased voltage relative to the motor vehicle power supply voltage;

a bidirectional converter, said battery being connected with said starter/generator through said DC voltage intermediate circuit and said bidirectional converter;

a number of consumers;

mains connected with said starter/generator through said bidirectional converter and also connected with said consumers; and

a control device connected with said converter so that said consumers are subjected to different voltages via said control device, said consumers being located between said battery and mains.

2. A motor vehicle power supply circuit according to claim 1, further comprising a pulse inverter connected between said starter/generator and said DC voltage intermediate circuit, said pulse inverter having the same output voltage as said DC voltage intermediate circuit.

3. A motor vehicle power supply circuit according to claim 1 wherein said starter/generator has a plurality of windings connected in a star connection.

4. A motor vehicle power supply circuit according to claim 1, further comprising additional consumers operable with a 220 volt alternating voltage connected via a DC/AC converter with said DC voltage intermediate circuit.

5. A motor vehicle power supply circuit according to claim 1, wherein said starter/generator comprises an asynchronous machine.

6. A motor vehicle power supply circuit according to claim 1, wherein said starter/generator comprises a synchronous machine having one of two-phase and three-phase connections.

7. A motor vehicle power supply circuit according to claim 1, wherein said starter/generator comprises two separate electric machines.

8. A motor vehicle power supply circuit according to claim 1, wherein said starter/generator is formed as a flywheel stator generator.

9. A motor vehicle power supply circuit according to claim 2, wherein said increased voltage is substantially 300 volts.