Circuit configuration for eliminating EMC interference

Patent metadata

Field	Value
Publication number	US-9083315-B2
Application number	US-81068207-A
Country	US
Kind code	B2
Filing date	Dec 28, 2007
Priority date	Dec 28, 2007
Publication date	Jul 14, 2015
Grant date	Jul 14, 2015

Abstract

A circuit configuration is disclosed for eliminating EMC interference, and a device includes such a circuit configuration, where a damping member is connected to at least one supply line leading to the consumer or consumers. In at least one embodiment optimal elimination of EMC interference of the electrical consumer or consumers is ensured, and overloading the power supply grid is avoided. To this end, in at least one embodiment the damping member is connected in series with a current-limiting element and can be connected to the consumer in parallel. It is thus possible to compensate for the effect of the current-limiting element and short-circuit said element for the operating state by way of a switch, whereby the element does not cause any loss of power outside of the power circuits and nevertheless has a current-limiting, that is, grid-friendly, effect during the power-up and charging process.

First claim

The invention claimed is:

1. A circuit arrangement for eliminating EMC interference of an electrical consumer, comprising:
a damping member configured to store charge, the damping member connected to at least one supply line of the electrical consumer, the damping member connected in series with a current-limiting element of the circuit arrangement and being connected in parallel to the at least one supply line of the electrical consumer;
a switch configured to bridge the current-limiting element;
a first controller, including a microprocessor, configured to,
output a signal to the switch to trigger the switch, and
trigger the switch based on whether the damping member has charged to a desired charge level, the desired charge level for the damping member being selected such that a desired EMC level is achieved for the electrical consumer; and

a second controller configured to control a capacitance of the damping member.

2. The circuit arrangement as claimed in claim 1 , wherein the first controller is configured to trigger the switch to bridge the current-limiting element after a charging process in which the damping member charges to the desired charge level.

3. The circuit arrangement as claimed in claim 2 , wherein the first controller includes at least one device configured for time measurement.

4. The circuit arrangement as claimed in claim 2 , wherein the first controller includes at least one device configured to detect a charging state of the damping member.

5. The circuit arrangement as claimed in claim 1 , wherein the damping member includes one of a capacitor and a capacitor circuit.

6. The circuit arrangement as claimed in claim 1 , wherein the damping member is provided for damping regulation purposes.

7. The circuit arrangement as claimed in claim 1 , wherein the current-limiting element includes one or more ohmic resistors.

8. The circuit arrangement as claimed in claim 1 , wherein the current-limiting element is provided to regulate a current-limiting resistance.

9. The circuit arrangement as claimed in claim 1 , wherein the second controller is one of a manual controller and an automatic controller.

10. An electrical device comprising:
a circuit arrangement to eliminate EMC interference of the electrical device, the circuit arrangement including a damping member configured to store charge, the damping member being connected to at least one supply line of the electrical device, the damping member being connected in series with a current-limiting element of the circuit arrangement and in parallel with a device-internal consumer;
a switch configured to bridge the current-limiting element;
a first controller, including a microprocessor, configured to,
output a signal to the switch to trigger the switch, and
trigger the switch based on whether the damping member has charged to a desired charge level, the desired charge level for the damping member being selected such that a desired EMC level is achieved for the electrical consume; and

a second controller configured to control a capacitance of the damping member.

11. The device as claimed in claim 10 , wherein the first controller is configured to trigger the switch to bridge the current-limiting element after a charging process in which the damping member charges to the desired charge level.

12. The device as claimed in claim 11 , wherein the first controller includes at least one device for time measurement.

13. The device as claimed in claim 11 , wherein the first controller includes at least one device to detect a charging state of the damping member.

14. The device as claimed in claim 10 , wherein the damping member includes one of a capacitor and a capacitor circuit.

15. The device as claimed in claim 10 , wherein the damping member is provided for damping regulation purposes.

16. The device as claimed in claim 10 , wherein the current-limiting element includes one or several ohmic resistors.

17. The device as claimed in claim 10 , wherein the current-limiting element is provided to regulate a current-limiting resistance.

18. The device as claimed in claim 10 , wherein the second controller is one of a manual controller and an automatic controller.

19. The device as claimed in claim 10 , wherein the device is one of a power supply unit, switching power supply, coil control and EMC module.

20. The circuit arrangement as claimed in claim 3 , wherein the at least one device configured for time measurement includes a counter.

21. The circuit arrangement as claimed in claim 1 , wherein the first controller is configured to at least one of control the resistance of the current-limiting element and control the damping regulation of the damping member.

22. The device as claimed in claim 11 , wherein the at least one device for time measurement includes a counter.

23. The device as claimed in claim 10 , wherein the first controller is configured to at least one of control a resistor of the current-limiting element and control the damping regulation of the damping member.

24. The circuit arrangement as claimed in claim 1 , wherein the first controller is configured to output the signal to the switch to trigger the switch based on a fixed time interval and the first controller is configured to adjust the fixed time interval.

25. The circuit arrangement as claimed in claim 2 , wherein a time interval of the charging process varies.

26. The circuit arrangement as claimed in claim 25 , wherein the time interval of the charging process is based on a size of the damping member.

27. The circuit arrangement as claimed in claim 4 , wherein the at least one device is configured to measure a voltage on or in the damping member.

Assignees

• Oppermann Christian
• Streich Bernhard
• Siemens Ag

Inventors

• Oppermann Christian
• Streich Bernhard

Classifications

• H02K11/02

  for suppression of electromagnetic interference · CPC title

• H05K1/0216

  Reduction of cross-talk, noise or electromagnetic interference (grounding H05K1/0215) · CPC title

• H03H19/008 Primary

  with variable switch closing time · CPC title