# US 10,483,893 B2 · Motor driving apparatus and home appliance including the same

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- Number: US 10,483,893 B2
- Document ID: US10483893B2
- Status: Granted
- Kind: B2
- Application number: 15/692,029
- Filed: 2017-08-31
- Published: 2018-03-01
- Granted: 2019-11-19
- Earliest claimed: 2016-08-31
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Jungsong Moon; Taeyoung Park; Sangyoung Kim
- Web page: https://patentgrep.com/patent/US10483893B2

## CPC

- H02P 21/24: Vector control not involving the use of rotor position or rotor speed sensors
- H02M 7/44: by static converters
- H02M 7/5387: in a bridge configuration
- H02P 21/12: Stator flux based control involving the use of rotor position or rotor speed sensors
- H02M 1/0054: {Transistor switching losses (periodically suspending operation of switching converter in low power mode H02M1/0035)}
- H02M 7/53876: {based on synthesising a desired voltage vector via the selection of appropriate fundamental voltage vectors, and corresponding dwelling times}
- H03K 2217/0036: Means reducing energy consumption
- Y02B 70/10: Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
- H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- 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)
- H03K: PULSE TECHNIQUE (measuring pulse characteristics G01R; modulating sinusoidal oscillations with pulses H03C; transmission of digital information H04L; discriminator circuits detecting phase difference between two signals by counting or integrating cycles of oscillation H03D3/04; automatic control, starting, synchronisation or stabilisation of generators of electronic oscillations or pulses where the type of generator is irrelevant or unspecified H03L; coding, decoding or code conversion, in general H03M)
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS

## Abstract

The present disclosure relates to a motor driving apparatus and a home appliance including the same. The motor driving apparatus in accordance with an embodiment of the present disclosure, comprises a DC-stage capacitor, a three-phase upper arm and lower arm switching element, an inverter to convert DC power from the DC-stage capacitor to an AC power by a switching operation and output the converted AC power to a motor, and a controller to control the inverter, wherein the controller controls the switching elements in the inverter based on a space vector-based pulse width variable, and controls a turn-on time of the switching elements to be shifted, wherein continuous first and second switching periods of the switching elements is changed to one switching period by shifting the a turn-on time of the switching elements. Accordingly, when the inverter is switched, noise can be reduced while reducing switching loss.

## Claims

### Claim 1

A motor driving apparatus, comprising:
a direct current (DC)-stage capacitor to store DC power;
an inverter including three-phase upper arm and lower arm switching elements, the inverter to convert, based on a switching operation, the DC power from the DC-stage capacitor to an alternate current (AC) power, and the inverter to output the converted AC power;
a controller to control the inverter, wherein the controller is configured to control the switching elements, and the controller is configured to control a turn-on time of the switching elements;
an output current detector to detect an output current in a motor,
wherein the controller is configured to:
provide a voltage command value based on the output current in the motor,
determine a position of a voltage vector based on the voltage command value,
when the position of the voltage vector is within a first region of a space vector area and any one of the three-phase switching elements in the inverter is continuously turned on during a first switching period and a second switching period contiguous to the first switching period, control others of the three-phase switching elements in the inverter to shift turn-on time in a direction to a boundary between the first switching period and the second switching period during the first switching period and the second switching period, and control all the three-phase switching elements in the inverter to turn on during a first period including the boundary between the first switching period and the second switching period,
when the position of the voltage vector is within a second region different from the first region of the space vector area and any one of the three-phase switching elements in the inverter is continuously turned off during the first switching period and the second switching period, control others of the three-phase switching elements in the inverter to shift turn-on time in the direction to the boundary between the first switching period and the second switching period during the first switching period and the second switching period, and control at least one of others of the three-phase switching elements in the inverter to turn on during a second period including the boundary between the first switching period and the second switching period.

### Claim 2 (depends on 1)

The motor driving apparatus of claim 1, wherein the controller is configured to:
shift the turn-on time within the first switching period for the switching element of a first phase of the three-phase switching elements and the turn-on time within the second switching period in the direction to the boundary between the first switching period and the second switching period.

### Claim 3 (depends on 1)

The motor driving apparatus of claim 1, wherein the controller is configured to:
shift a turn-on time for turning on the switching element of a first phase of the three-phase switching elements during the first switching period and the second switching period for the turn-on time of the switching element to be symmetric about the boundary between the first switching period and the second switching period, and
shift the turn-on time such that third and fourth switching periods include an asymmetrical interval in which the turn-on time for the switching element of a first phase of the three-phase switching elements is asymmetrical, wherein the third and fourth switching periods are subsequent to the first and second switching periods.

### Claim 4 (depends on 1)

The motor driving apparatus of claim 1,
wherein the controller is configured to determine whether the switching element of any one of the three-phase switching elements is to be turned on or turned off based on an amplitude of the output current.

### Claim 5 (depends on 4)

The motor driving apparatus of claim 4, wherein the controller is configured to:
when the switching element of any one of the three-phase switching elements is turned on, shift the turn-on time for the first switching period and the turn-on time for the second switching period, for a switching vector having a smallest amplitude among three-phase switching vectors, in the direction to the boundary between the first switching period and the second switching period.

### Claim 6 (depends on 5)

The motor driving apparatus of claim 5, wherein the controller is configured to:
when the switching element of any one of the three-phase switching elements is turned on, shift the turn-on time for the first switching period and the turn-on time for the second switching period, for a switching vector having a second largest amplitude among the three-phase switching vectors, in the direction to the boundary between the first switching period and the second switching period.

### Claim 7 (depends on 4)

The motor driving apparatus of claim 4, wherein the controller is configured to:
when the switching element of any one of the three-phase switching elements is turned off, shift the turn-on time for the first switching period and the turn-on time for the second switching period, for a switching vector having a largest amplitude among three-phase switching vectors, in the direction to the boundary between the first switching period and the second switching period.

### Claim 8 (depends on 7)

The motor driving apparatus of claim 7, wherein the controller is configured to:
when the switching element of any one of the three-phase switching elements is turned off, shift the turn-on time for the first switching period and the turn-on time for the second switching period, for a switching vector having a second largest amplitude among the three-phase switching vectors, in the direction to the boundary between the first switching period and the second switching period.

### Claim 9 (depends on 1)

The motor driving apparatus of claim 1,
wherein the controller is configured to:
control the first and second switching periods to include a symmetrical interval, and control third and fourth switching periods to include an asymmetric interval, based on the position of the voltage vector.

### Claim 10 (depends on 1)

The motor driving apparatus of claim 1, wherein the inverter to output the converted AC power to a motor.

### Claim 11 (depends on 1)

A home appliance comprising:
a motor; and
the motor driving apparatus of claim 1, wherein the motor driving apparatus to drive the motor.