Battery heating system and method using motor driving system

1. A battery heating system using a motor driving system, comprising:

an inverter having a plurality of legs that each include a pair of switching elements connected in series to each other between both ends of a battery and correspond to each of a plurality of phases;

a motor having a plurality of coils each having a first end connected to a connection terminal between the pair of switching elements included in the plurality of legs, and second ends of each of the plurality of coils being connected to each other; and

a controller configured to drive the switching elements so that a first section in which at least some of the switching elements are turned on and a second section in which all of the switching elements are turned off are alternately repeated,

wherein the controller is further configured to:

drive the switching elements in a first switch driving mode in which the switching elements are driven so that on/off states of the switching elements included one leg corresponding to one reference phase of the plurality of phases and the switching elements included in remaining legs are in a mutually complementary relationship, or

drive the switching elements in a second switch driving mode in which the switching elements are driven so that the on/off states of the switching elements included in the legs corresponding to two phases of the plurality of phases are in the mutually complementary relationship and drives the switching elements included in the remaining leg to be in the off state, in the first section.

2. The battery heating system of claim 1 , wherein the controller is configured to:

perform control so that the on/off states of the pair of switching elements included in the plurality of legs are in the mutually complementary relationship in the first section when applying the first switch driving mode; and

perform control so that on/off states of a switching element connected to a positive terminal of the battery among the switching elements included in the leg corresponding to the reference phase and a switching element connected to the positive terminal of the battery among the switching elements included in the remaining legs are in the mutually complementary relationship.

3. The battery heating system of claim 1 , wherein the controller is configured to:

performs control so that states of a pair of switching elements included in a first leg corresponding to one phase of two selected phases are in the mutually complementary relationship according to a switching frequency and performs control so that states of a pair of switching elements included in a second leg corresponding to the other phase of the two selected phases are in the mutually complementary relationship according to the switching frequency, in the first section, when applying the second switch driving mode; and

performs control so that states of a switching element connected to a positive terminal of the battery among the switching elements in the first leg and a switching element connected to the positive terminal of the battery among the switching elements in the second leg are in the mutually complementary relationship.

4. The battery heating system of claim 1 , wherein the controller is configured to determine the reference phase applied in the first switch driving mode or the two phases in which the switching elements are driven in the second switch driving mode, based on an angle of a rotor of the motor.

5. The battery heating system of claim 4 , wherein the controller is configured to determine the reference phase of the first switch driving mode or the two phases in which the switching elements are driven in the second switch driving mode to minimize a difference between the angle of the rotor and an angle indicated by a current provided to the motor on a dq stationary coordinate plane.

6. A battery heating system using a motor driving system, comprising:

an inverter having an a-phase leg, a b-phase leg, and a c-phase leg each including a pair of switching elements connected in series between both ends of a battery;

a motor including an a-phase coil having a first end connected to a connection node between the pair of switching elements included in the a-phase leg, a b-phase coil having a first end connected to a connection node between the pair of switching elements included in the b-phase leg, and a c-phase coil having a first end connected to a connection node between the pair of switching elements included in the c-phase leg, a second end of the a-phase coil, a second end of the b-phase coil, and a second end of the c-phase coil being connected to each other; and

a controller configured to drive the switching elements so that a first section in which at least some of the switching elements are turned on and a second section in which all of the switching elements are turned off are alternately repeated,

wherein the controller is configured to:

drive the switching elements in a first switch driving mode in which the switching elements are driven so that on/off states of the switching elements included a leg corresponding to one reference phase of an a-phase, a b-phase, and a c-phase and on/off states of the switching elements included in the legs corresponding to the remaining phases are in a mutually complementary relationship, or

drive the switching elements in a second switch driving mode in which the switching elements are driven so that the on/off states of the switching elements included in the legs corresponding to two phases of the a-phase, the b-phase, and the c-phase are in the mutually complementary relationship and drives the switching elements included in the remaining leg to be in the off state, in the first section.

7. The battery heating system of claim 6 , wherein the controller is configured to:

perform control so that the on/off states of the pair of switching elements included in a plurality of legs are in the mutually complementary relationship in the first section when using a first driving technique, and

perform control so that on/off states of a switching element connected to a positive terminal of the battery among the switching elements included in the leg corresponding to the reference phase and a switching element connected to the positive terminal of the battery among the switching elements included in remaining legs are in the mutually complementary relationship.

8. The battery heating system of claim 6 , wherein the controller is configured to:

perform control so that states of a pair of switching elements included in a first leg corresponding to one phase of two selected phases are in the mutually complementary relationship according to a switching frequency and perform control so that states of a pair of switching elements included in a second leg corresponding to the other phase of the two selected phases are in the mutually complementary relationship according to the switching frequency, in the first section, when applying a second driving technique, and

perform control so that states of a switching element connected to a positive terminal of the battery among the switching elements in the first leg and a switching element connected to the positive terminal of the battery among the switching elements in the second leg are in the mutually complementary relationship.

9. The battery heating system of claim 6 , wherein the controller is configured to determine the reference phase applied in the first switch driving mode or the two phases in which the switching elements are driven in the second switch driving mode, based on an angle of a rotor of the motor.

10. The battery heating system of claim 9 , wherein the controller is configured to determine the reference phase of the first switch driving mode or the two phases in which the switching elements are driven in the second switch driving mode to minimize a difference between the angle of the rotor and an angle indicated by a current provided to the motor on a dq stationary coordinate plane.

11. The battery heating system of claim 9 , wherein the controller is configured to drive the switching elements in the first switch driving mode when a remainder of dividing a value obtained by adding 15° to the angle of the rotor by 30° is an even number, and drive the switching elements in the second switch driving mode when the remainder of dividing a value obtained by adding 15° to the angle of the rotor by 30° is an odd number.

12. The battery heating system of claim 9 , wherein the controller is configured to drive the switching elements by determining the a-phase as a reference phase when the angle of the rotor is 0° to 30°, 150° to 210°, and 330° to 360°, in the first switch driving mode.

13. The battery heating system of claim 9 , wherein the controller is configured to drive the switching elements by determining the c-phase as a reference phase when the angle of the rotor is 30° to 90° and 210° to 270°, in the first switch driving mode.

14. The battery heating system of claim 9 , wherein the controller is configured to drive the switching elements by determining the b-phase as a reference phase when the angle of the rotor is 90° to 150° and 270° to 330°, in the first switch driving mode.

15. The battery heating system of claim 9 , wherein in the second switch driving mode, the controller is configured to select the c-phase leg and the a-phase leg when the angle of the rotor is 0° to 60° and 180° to 240°, drive the on-off states of the switching elements included in the c-phase leg and the a-phase leg in the mutually complementary relationship in the first section, and turn off the switching elements included in the b-phase leg.

16. The battery heating system of claim 9 , wherein in the second switch driving mode, the controller is configured to select the b-phase leg and the c-phase leg when the angle of the rotor is 60° to 120° and 240° to 300°, drive the on-off states of the switching elements included in the b-phase leg and the c-phase leg in the mutually complementary relationship in the first section, and turn off the switching elements included in the a-phase leg.

17. The battery heating system of claim 9 , wherein in the second switch driving mode, the controller is configured to select the a-phase leg and the b-phase leg when the angle of the rotor is 120° to 180° and 300° to 360°, drive the on-off states of the switching elements included in the a-phase leg and the b-phase leg in the mutually complementary relationship in the first section, and turn off the switching elements included in the c-phase leg.

18. A battery heating method using the battery heating system of claim 6 , comprising:

determining, by the controller, a section of an angle of a rotor of the motor;

selecting, by the controller, one of the first switch driving mode and the second switch driving mode based on the section;

driving, by the controller, the switching elements so that on/off states of the switching elements included in a leg corresponding to the reference phase and on/off states of the switching elements included in the legs corresponding to the remaining phases are in the mutually complementary relationship in the first section, when the first switch driving mode is selected; and

driving, by the controller, the switching elements so that on/off states of the switching elements included in the legs corresponding to two phases are in the mutually complementary relationship in the first section and driving, by the controller, the switching elements so that the switching elements included in the remaining leg are in the off state, when the second switch driving mode is selected.

19. The battery heating method of claim 18 , wherein the selecting of one of the first switch driving mode and the second switch driving mode, includes driving the switching elements in the first switch driving mode when a remainder of dividing a value obtained by adding 15° to the angle of the rotor by 30° is an even number, and driving the switching elements in the second switch driving mode when the remainder of dividing a value obtained by adding 15° to the angle of the rotor by 30° is an odd number.

20. The battery heating method of claim 18 , wherein the driving of the switching elements, includes when the first switch driving mode is selected, driving the switching elements by determining the a-phase as a reference phase when the angle of the rotor is 0° to 30°, 150° to 210°, and 330° to 360°.

21. The battery heating method of claim 18 , wherein the driving of the switching elements, includes when the first switch driving mode is selected, driving the switching elements by determining the c-phase as a reference phase when the angle of the rotor is 30° to 90° and 210° to 270°.

22. The battery heating method of claim 18 , wherein the driving of the switching elements, includes when the first switch driving mode is selected, driving the switching elements by determining the b-phase as a reference phase when the angle of the rotor is 90° to 150° and 270° to 330°.

23. The battery heating method of claim 18 , wherein the driving of the switching elements, includes when the second switch driving mode is selected, selecting the c-phase leg and the a-phase leg when the angle of the rotor is 0° to 60° and 180° to 240°, driving the on-off states of the switching elements included in the c-phase leg and the a-phase leg in the mutually complementary relationship in the first section, and turning off the switching elements included in the b-phase leg.

24. The battery heating method of claim 18 , wherein the driving of the switching elements, includes when the second switch driving mode is selected, selecting the b-phase leg and the c-phase leg when the angle of the rotor is 60° to 120° and 240° to 300°, driving the on-off states of the switching elements included in the b-phase leg and the c-phase leg in the mutually complementary relationship in the first section, and turning off the switching elements included in the a-phase leg.

25. The battery heating method of claim 18 , wherein the driving of the switching elements, includes when the second switch driving mode is selected, selecting the a-phase leg and the b-phase leg when the angle of the rotor is 120° to 180° and 300° to 360°, driving the on-off states of the switching elements included in the a-phase leg and the b-phase leg in the mutually complementary relationship in the first section, and turning off the switching elements included in the c-phase leg.