# US 2013/0154526 A1 · Apparatus and method for compensating offset of current sensor

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- Number: US 2013/0154526 A1
- Document ID: US20130154526A1
- Status: Published application
- Kind: A1
- Application number: 13/711,475
- Filed: 2012-12-11
- Published: 2013-06-20
- Earliest claimed: 2011-12-19
- Assignees: Lsis Co., Ltd.
- Inventors: Gi Young CHOI
- Web page: https://patentgrep.com/patent/US20130154526A1

## CPC

- H02P 6/28: Arrangements for controlling current (H02P6/10 takes precedence)
- G01R 35/005: {Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references (G01R33/0035, G01R35/002 take precedence)}
- G01R 19/0092: {Measuring current only}
- H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)

## Abstract

Provided is an apparatus for compensating offset of a current sensor detecting a motor current supplied by an inverter for PWM (Pulse Width Modulation) control of a motor, the apparatus including a current controller providing a PWM signal generated based on the motor current detected by the current sensor to the inverter, calculating an offset using the motor current detected by the current sensor in response to presence and absence of the PWM control of the motor, or offset-compensating the motor current detected by the current sensor.

## Claims

### Claim 1

An apparatus for compensating offset of a current sensor detecting a motor current supplied by an inverter for PWM (Pulse Width Modulation) control of a motor, the apparatus comprising: a current controller providing a PWM signal generated based on the motor current detected by the current sensor to the inverter, calculating an offset using the motor current detected by the current sensor in response to presence and absence of the PWM control of the motor, or offset-compensating the motor current detected by the current sensor.

### Claim 2 (depends on 1)

The apparatus of claim 1, wherein the current controller calculates the offset by using the motor current, in a case the PWM control of the motor is discontinued.

### Claim 3 (depends on 1)

The apparatus of claim 1, wherein the current controller offset-compensates the motor current detected by the current sensor, in a case the PWM control of the motor is performed.

### Claim 4 (depends on 2)

The apparatus of claim 2, wherein the current controller calculates as an offset a current value of the motor current, in a case the PWM control of the motor is discontinued.

### Claim 5

A method for compensating offset of a current sensor detecting a motor current supplied by an inverter for PWM (Pulse Width Modulation) control of a motor, the method comprising: determining whether a PWM control of the motor is performed; and performing an offset calculation or an offset compensation of the motor current detected by the current sensor as a result of the determination.

### Claim 6 (depends on 5)

The method of claim 5, wherein the step of performing an offset calculation or an offset compensation of the motor current detected by the current sensor as a result of the determination includes calculating an offset by using the motor current detected by the current sensor, in a case the PWM control of the motor is discontinued.

### Claim 7 (depends on 5)

The method of claim 5, wherein the step of performing an offset calculation or an offset compensation of the motor current detected by the current sensor as a result of the determination includes performing an offset compensation to the motor current detected by the current sensor, in a case the PWM control of the motor is continuously performed.

### Claim 8 (depends on 6)

The method of claim 6, wherein a current value of the motor current is calculated as an offset, in a case the PWM control of the motor is discontinued.

### Claim 9 (depends on 7)

The method of claim 7, further comprising providing a PWM signal to the inverter, the PWM signal is generated from the offset-compensated motor current, in a case the PWM control of the motor is continuously performed.