Apparatus and method for controlling LLC resonance converter
The present disclosure relates to an apparatus and a method for controlling an LLC resonance converter. The apparatus includes a converter connected to an input terminal, including a plurality of switching elements constituting a bridge circuit, and enabling a topology change in the form of a full bridge and a half bridge; and a controller detecting a charge measurement value of a battery being charged with a power transferred by the converter, and changing a topology of the converter based on the charge measurement value. Since battery charging is performed by changing the topology of the converter in accordance with the charge measurement value of the battery, the LLC resonance converter can be controlled at an optimized frequency, the efficiency is increased, and cost savings can be achieved.
1. An apparatus for controlling an LLC resonance converter, the apparatus comprising:
a converter connected to an input terminal, the converter including a plurality of switching elements constituting a bridge circuit, and the converter configured to enable a topology change in the form of a full bridge and a half bridge; and
a controller configured to detect a charge measurement value of a battery being charged with a power transferred by the converter, and wherein the controller is configured to change a topology of the converter based on the charge measurement value;
wherein the plurality of switching elements comprise first and third switches connected in series to a first leg of the input terminal, and second and fourth switches connected in series to a second leg of the input terminal; and
wherein the converter further includes:
a resonance tank having a first end connected to the first leg between the first and third switches, and a second end connected to the second leg between the second and fourth switches, and resonating through reception of a power formed by switching of the plurality of switching elements; and
a plurality of relays positioned between the plurality of switching elements and the resonance tank;
wherein the controller is configured to change the topology of the converter by controlling operations of the plurality of relays based on the charge measurement value;
wherein the plurality of relays comprise:
a first relay having a first end connected to the second leg between the second and fourth switches, and a second end being able to be coupled to a first position in which the second end of the first relay is connected to the first leg between the first and third switches, or a second position in which the second end is connected to the second end of the resonance tank under the control of the controller; and
a second relay having a first end connected to the second end of the resonance tank, and a second end being able to be coupled to a third position in which the second end of the second relay is connected to the second leg between the second and fourth switches, and a fourth position connected between the third and fourth switches under the control of the controller.
2. The apparatus according to claim 1 , wherein the controller is configured to change the topology of the converter by controlling on/off of the plurality of switching elements based on the charge measurement value.
3. The apparatus according to claim 1 , wherein the controller is configured to change the topology of the converter to the half bridge when the detected charge measurement value is in a predetermined low voltage range.
4. The apparatus according to claim 1 , wherein the controller is configured to change the topology of the converter to the full bridge when the detected charge measurement value is in a predetermined nominal or high voltage range.
5. The apparatus according to claim 1 , wherein the controller changes the topology of the converter to a full bridge by controlling the plurality of relays so that the second end of the first relay is coupled to the second position, and the second end of the second relay is coupled to the third position.
6. The apparatus according to claim 1 , wherein the controller changes the topology of the converter to a half bridge by controlling the plurality of relays so that the second end of the first relay is coupled to the first position, and the second end of the second relay is coupled to the fourth position.
7. A method for controlling an LLC resonance converter of claim 1 , the method comprising:
detecting the charge measurement value of the battery; and
changing the topology of the converter transferring the power for charging the battery based on the detected charge measurement value.
8. The method according to claim 7 , wherein the topology of the converter is the full bridge or the half bridge.
9. The method according to claim 8 , wherein the changing the topology of the converter comprises changing the topology of the converter to the half bridge when the detected charge measurement value belongs to a predetermined low voltage range.
10. The method according to claim 8 , wherein the changing the topology of the converter comprises changing the topology of the converter to the full bridge when the detected charge measurement value is a predetermined nominal voltage or belongs to a high voltage range.
11. The method according to claim 7 , wherein the changing the topology of the converter is performed by controlling on/off of the plurality of switching elements disposed at the input terminal of the converter.
12. The method according to claim 7 , wherein the changing the topology of the converter is performed by controlling on/off of the plurality of relays disposed at the input terminal of the converter.