# US 2021/0281182 A1 · Phase current control device for dab converter, and method therefor

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- Number: US 2021/0281182 A1
- Document ID: US20210281182A1
- Status: Published application
- Kind: A1
- Application number: 16/336,829
- Filed: 2016-11-11
- Published: 2021-09-09
- Earliest claimed: 2016-10-26
- Assignees: Korea Electric Power Corporation
- Applicants: Korea Electric Power Corporation
- Inventors: Jae-Han KIM; Ju-Yong KIM; Jin-Tae CHO; Young-Pyo CHO; Jee-Hoon JUNG; Hyun-Jun CHOI
- Web page: https://patentgrep.com/patent/US20210281182A1

## CPC

- H02M 3/33573: {Full-bridge at primary side of an isolation transformer}
- H02M 3/33584: {Bidirectional converters}
- G01R 19/0038: {Circuits for comparing several input signals and for indicating the result of this comparison, e.g. equal, different, greater, smaller (comparing pulses or pulse trains according to amplitude)}
- G01R 19/02: Measuring effective values, i.e. root-mean-square values
- G01R 19/16547: {voltage or current in AC supplies (switching for protection H02H; circuits for emergency power supply H02J9/00)}
- H02M 1/0009: {Devices or circuits for detecting current in a converter}
- H02M 1/0043: {Converters switched with a phase shift, i.e. interleaved (non-isolated DC/DC converters H02M3/1586)}
- H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P)
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)

## Abstract

Disclosed are a phase current control device for a DAB converter and a method therefor. The device includes a DAB converter having at least one leg including a switching element, a phase current measuring unit for measuring a phase current for each of the legs, and a phase current phase controller for performing phase control by setting one of the phase currents of the respective legs as a reference phase current, comparing each of the other phase currents with the reference phase current to derive a phase difference for each of the phase currents, and compensating each of the phase currents for a corresponding one of the phase differences.

## Claims

### Claim 1

A phase current control device for a DAB converter, the device comprising:
a DAB converter having at least one leg including a switching element;
a phase current measuring unit for measuring a phase current for each of the legs; and
a phase current phase controller for performing phase control by setting one of the phase currents of the respective legs as a reference phase current, comparing each of the other phase currents with the reference phase current, and compensating each of the phase currents for a phase difference.

### Claim 2 (depends on 1)

The phase current control device according to claim 1, wherein the phase current measuring unit determines a root mean square (RMS) for each of the phase currents, and the phase current phase controller determines a phase control method on the basis of an RMS deviation for each of the phase currents.

### Claim 3 (depends on 1)

The phase current control device according to claim 1, wherein the DAB converter includes a first-first leg, a first-second leg, and a first-third leg on a primary side and a second-first leg, a second-second leg, and a second-third leg on a secondary side, and
the phase current phase controller performs the phase control by compensating for a phase difference on each of a phase current flowing between the first-first leg and the second-first leg, a phase current flowing between the first-second leg and the second-second leg, and a phase current flowing between the first-third leg and the second-third leg.

### Claim 4

A phase current control method for a DAB converter, the method comprising:
measuring a phase current per leg of a DAB converter;
deriving a phase shift compensation value for each of the phase currents by setting one of the phase currents of the respective legs as a reference phase current and comparing each of the other phase currents of the respective legs with the reference phase current; and
controlling phases of the respective current phases on the basis of the phase shift compensation values.

### Claim 5 (depends on 4)

The phase current control method according to claim 4, further comprising checking whether there is a phase current imbalance between the legs of the DAB converter, wherein the checking is performed after the measuring.