Device for compensating for current or voltage

Patent metadata

Field	Value
Publication number	US-12170489-B2
Application number	US-202318396750-A
Country	US
Kind code	B2
Filing date	Dec 27, 2023
Priority date	Apr 17, 2019
Publication date	Dec 17, 2024
Grant date	Dec 17, 2024

Abstract

This application relates to an active compensating device. In one aspect, the active compensating device includes two or more high current paths through which a second current supplied by a second device is transmitted to a first device, and a sensing unit sensing the first current on the high current paths and generating an output signal corresponding to the first current. The device may also include an amplifying unit amplifying the output signal of the sensing unit to generate an amplified current and a compensating unit generating a compensation current based on the amplified current and allowing the compensation current to flow to each of the two or more high current paths. The device may further include a first anti-disturbance unit connected in parallel to output terminals of the sensing unit, and a second anti-disturbance unit connected in parallel to input terminals of the compensating unit.

First claim

What is claimed is:

1. A current compensating device configured to actively compensate for a first current input as a common mode current from a first device, the current compensating device comprising:
at least two or more high current paths through which a second current supplied from a second device is transmitted to the first device;
a first balancing unit configured to adjust balancing of the first current between the at least two or more high current paths;
a sensing unit configured to detect the first current, of which balancing has been adjusted by the first balancing unit, and generate an output signal corresponding to a detection result, on the at least two or more high current paths;
an amplifying unit configured to amplify the output signal to generate an amplified output signal;
a compensating unit configured to generate a compensation current on the basis of the amplified output signal; and
a compensating capacitor unit configured to provide a path through which the compensation current flows to each of the at least two or more high current paths,
wherein the first current is a current of a first frequency band, and
the first balancing unit includes one or more high current path connection units configured to provide paths through which the current of the first frequency band flows between the at least two or more high current paths.

2. The current compensating device of claim 1 , wherein, in the first frequency band, a difference between voltages of the at least two or more high current paths is reduced to a predetermined threshold voltage difference or less by the one or more high current path connection units.

3. The current compensating device of claim 1 , wherein a difference between impedances when viewed to respective the at least two or more high current paths from the first balancing unit is less than or equal to a predetermined threshold impedance difference.

4. The current compensating device of claim 1 , wherein the current compensating device further includes a second balancing unit configured to adjust balancing of synthetic currents, which are generated by adding the compensation current to the first current whose balancing has been adjusted, on the at least two or more high current paths.

5. The current compensating device of claim 1 , wherein the current compensating device further includes a phase control unit configured to electrically connect the at least two or more high current paths between the second device and the current compensating device such that the at least two or more electrically connected high current paths are used as one high current path.

6. The current compensating device of claim 1 ,
wherein the compensating capacitor unit configured to provide a path through which the compensation current flows to a reference high current path which is one of the at least two or more high current paths,
further comprising
a second balancing unit configured to distribute the compensation current, which has been provided to the reference high current path, to the at least two or more high current paths,
wherein the second balancing unit adjusts balancing of synthetic currents on the at least two or more high current paths,
wherein the synthetic currents are currents obtained by adding the compensation current to the first current of which balancing has been adjusted on each of the at least two or more high current paths.

7. The current compensating device of claim 6 , wherein the current compensating device further includes an output impedance control unit configured to control an output impedance from the compensating unit toward the second device.

8. The current compensating device of claim 7 , wherein
the output impedance control unit includes a first capacitor configured to provide a path through which a current flows between the reference high current path and a reference potential of the compensating unit, and
the second balancing unit includes one or more second capacitors configured to provide a path through which a current flows between the reference high current path and each of the remaining high current paths.

9. The current compensating device of claim 8 , wherein the output impedance is a synthetic impedance obtained by connecting a first impedance, which is obtained by connecting the first capacitor and the second capacitor to each other in series, to an impedance of the second device in parallel.

Assignees

• Em Coretech Inc
• Ulsan Nat Inst Science & Tech Unist

Inventors

• Kim Jin Gook
• Jeong Sang Yeong

Classifications

• H02M1/32

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• Y02B70/10

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• H02M1/08

  Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters · CPC title

• H02M1/38

  Means for preventing simultaneous conduction of switches · CPC title

• H02M1/36

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