Compensation device for leakage currents

Patent metadata

Field	Value
Publication number	US-11366176-B2
Application number	US-202017038156-A
Country	US
Kind code	B2
Filing date	Sep 30, 2020
Priority date	Oct 1, 2019
Publication date	Jun 21, 2022
Grant date	Jun 21, 2022

Abstract

A compensation device for compensating leakage currents has a differential current measurement device, a first signal generation device, an amplifier and a feeder device. The first signal generation device is designed to generate a first compensation current specification signal (I_COMP_S1) suitable for the compensation from the first signal (I_DIFF) from the differential current measurement device by way of analog signal processing and to feed this first compensation current specification signal (I_COMP_S1) to the amplifier in analog or digitized form. The amplifier is designed to generate a compensation current (I_COMP) on the basis of the first compensation current specification signal (I_COMP_S1), and the feeder device is designed to allow the compensation current to be fed in at at least one of the active conductors.

First claim

What is claimed:

1. A compensation device for compensating leakage currents, said compensation device comprising:
a differential current measurement device,
a first signal generation device,
an amplifier, and
a feeder device,
wherein the differential current measurement device is configured to be arranged on active conductors and is configured to record a first signal (I_DIFF) and to feed said first signal to the first signal generation device, which first signal (I_DIFF) is analog and characterizes a differential current at the active conductors,
wherein the first signal generation device is configured to generate a first compensation current specification signal (I_COMP_S 1 ) suitable for the compensation from the first signal (I_DIFF) by way of analog signal processing and to feed the first compensation current specification signal (I_COMP_S 1 ) to the amplifier in analog or digitized form,
wherein the amplifier is configured to generate a compensation current (I_COMP) on the basis of the first compensation current specification signal (I_COMP_S 1 ), and
wherein the feeder device is configured to allow the compensation current to be fed in at least one of the active conductors.

2. The compensation device as claimed in claim 1 , in which the first signal generation device has a first analog filter that is configured as a frequency filter.

3. The compensation device as claimed in claim 2 , in which the first analog filter has a low-pass filter.

4. The compensation device as claimed in claim 2 , in which the first analog filter has a high-pass filter.

5. The compensation device as claimed in claim 2 , in which the first analog filter has a band-stop filter, a band-pass filter, or a band-stop filter and a band-pass filter.

6. The compensation device as claimed in claim 1 , in which the first signal generation device has a second analog filter that is configured to perform a phase reversal of the first signal (I_DIFF) or of a signal (I_DIFF′) derived from the first signal (I_DIFF).

7. The compensation device as claimed in claim 1 , further comprising a control device that is configured to allow digital signal processing.

8. The compensation device as claimed in claim 7 , further comprising a compensation current measurement device that is configured to measure the compensation current (I_COMP), to generate a second signal (I_COMP_I) characterizing the compensation current (I_COMP) and to feed the second signal (I_COMP_I) to the control device.

9. The compensation device as claimed in claim 8 , wherein the control device has a monitoring device that is configured to monitor a magnitude of the compensation current (I_COMP) on the basis of the second signal (I_COMP_I).

10. The compensation device as claimed in claim 8 , wherein the control device is configured to generate a second compensation current specification signal (I_COMP_S 2 ) on the basis of the second signal (I_COMP_I) and to feed the second compensation current specification signal (I_COMP_S 2 ) to the amplifier.

11. The compensation device as claimed in claim 7 , further comprising a signal processing device having an analog-to-digital converter and that is configured to convert the first signal (I_DIFF; I_DIFF″) into a third signal (I_DIFF_D) via the analog-to-digital converter and to feed the third signal (I_DIFF_D) to the control device, wherein the third signal (I_DIFF_D) is a digital signal.

12. The compensation device as claimed in claim 11 , in which the control device has a second signal generation device that is configured to generate a second compensation current specification signal (I_COMP_S 2 ) suitable for the compensation from the third signal (I_DIFF_D) and to feed the second compensation current specification signal (I_COMP_S 2 ) to the amplifier.

13. The compensation device as claimed in claim 12 , in which the first signal generation device is configured to evaluate at least one first frequency sub-range (F 1 , F 3 ) of the first signal (I_DIFF) in order to determine the first compensation current specification signal (I_COMP_S 1 ), and in which the second signal generation device is configured, when determining the second compensation current specification signal (I_COMP_S 2 ), to evaluate at least one second frequency sub-range (F 2 ) with respect to an entire frequency range of the first signal (I_DIFF).

14. The compensation device as claimed in claim 13 , in which the at least one first frequency sub-range (F 1 , F 3 ) and the at least one second frequency sub-range (F 2 ) do not overlap one another in each case.

15. The compensation device as claimed in claim 13 , in which at least one frequency sub-range (F 1 ) of the at least one first frequency sub-range (F 1 ; F 3 ) comprises lower frequencies than each frequency sub-range (F 2 ) of the at least one second frequency sub-range (F 2 ).

16. The compensation device as claimed in claim 13 , in which at least one frequency sub-range (F 3 ) of the at least one first frequency sub-range (F 1 ; F 3 ) comprises higher frequencies than each frequency sub-range (F 2 ) of the at least one second frequency sub-range (F 2 ).

17. The compensation device as claimed in claim 13 , in which only one second frequency sub-range (F 2 ) is provided.

18. A vehicle having a charger for a traction battery, which charger has a rectifier that is connected either directly or indirectly to the traction battery, wherein the traction battery is coupled galvanically to the active conductors, and wherein the charger has the compensation device as claimed in claim 1 .

Assignees

• Porsche Ag

Inventors

• Spesser Daniel
• Pfizenmaier Tim

Classifications

• H02J7/94

  in response to battery current · CPC title

• H02J7/80

  including monitoring or indicating arrangements · CPC title

• B60L50/60 Primary

  using power supplied by batteries (in combination with fuel cells B60L50/75) · CPC title

• B60L3/0069

  relating to the isolation, e.g. ground fault or leak current · CPC title

• Y02T90/14

  Plug-in electric vehicles · CPC title