Electric drive system and operating method

Patent metadata

Field	Value
Publication number	US-11245349-B2
Application number	US-202016794477-A
Country	US
Kind code	B2
Filing date	Feb 19, 2020
Priority date	May 9, 2019
Publication date	Feb 8, 2022
Grant date	Feb 8, 2022

Abstract

A drive system for an electrically driven motor vehicle and a method for operating the drive system, which increases the service life of a power module which is a component of a pulse inverter of the drive system.

First claim

The invention claimed is:

1. A drive system for an electrically driven motor vehicle, comprising:
at least one high-voltage battery, at least one electric machine operated with alternating current for driving the electrically driven motor vehicle, and a pulse inverter arranged between the high-voltage battery and the electric machine,
wherein the pulse inverter comprises a buck converter provided upstream of a power module, and the buck converter is configured to convert an input voltage of the pulse inverter into a lower output voltage which is applied at the input of the power module,
wherein the input voltage is between 800 and 1000 Volts.

2. The drive system according to claim 1 , wherein the buck converter includes a switch, a diode, an inductor and a capacitor.

3. The drive system according to claim 1 , wherein the output voltage is between 50% and 80% of the input voltage.

4. A method for increasing the service life of electrical components in an electrically driven motor vehicle, comprising:
decreasing an input voltage of a pulse inverter arranged between a high-voltage battery and at least one electric drive for driving the electrically driven motor vehicle, the pulse inverter comprising a converter provided upstream of a power module,
wherein the input voltage is decreased to a lower voltage which is applied at the input of the power module,
wherein the lower voltage is between 50% and 80% of the input voltage.

5. The method according to claim 4 , wherein the converter is a buck converter.

6. The method according to claim 4 , wherein the input voltage is between 800 and 1000 Volts.

7. The method according to claim 4 , wherein the input voltage is between 350 and 500 Volts.

8. A drive system for an electrically driven motor vehicle, comprising:
at least one high-voltage battery, at least one electric machine operated with alternating current for driving the electrically driven motor vehicle, and a pulse inverter arranged between the high-voltage battery and the electric machine,
wherein the pulse inverter comprises a buck converter provided upstream of a power module, and the buck converter is configured to convert an input voltage of the pulse inverter into a lower output voltage which is applied at the input of the power module,
wherein the lower voltage is approximately 59% of the input voltage.

9. The drive system according to claim 8 , wherein the input voltage is between 800 and 1000 Volts.

10. The drive system according to claim 8 , wherein the input voltage is 850 Volts.

Assignees

• Audi Ag

Inventors

• Eberhart Philipp

Classifications

• H02P2201/11

  Buck converter, i.e. DC-DC step down converter decreasing the voltage between the supply and the inverter driving the motor · CPC title

• H02M3/156

  with automatic control of output voltage or current, e.g. switching regulators · CPC title

• B60L2210/12

  Buck converters · CPC title

• H02M7/48 Primary

  using discharge tubes with control electrode or semiconductor devices with control electrode · CPC title

• H02P27/06 Primary

  using DC to AC converters or inverters (H02P27/05 takes precedence) · CPC title