Motor driving device and air conditioner including the same
A motor driving device and an air conditioner including the same are disclosed. The disclosed motor driving device includes a rectifier to rectify input AC power, and a converter to convert the power rectified by the rectifier into DC power. The converter includes an interleaved converter including a first converter and a second converter, which operate in an interleaved manner. The first converter of the interleaved converter includes a first boost converter, and a first resonator including a passive element connected to the first boost converter, to perform resonation. Accordingly, it is possible to reduce switching loss generated upon power conversion.
1. A motor driving device comprising:
a rectifier configured for coupling to an AC power source; and
an interleaved converter coupled to the rectifier to convert an output of the rectifier into a DC level, wherein
the interleaved converter includes a first converter and a second converter configured to operate in an interleaved manner, and
the first converter includes a first boost converter and a first resonator having a first LC circuit coupled to the first boost converter to perform resonation,
wherein the first resonator includes:
a first resonating diode, a second resonating diode, and a first resonating inductor coupled in series between first and second nodes of the rectifier,
a first resonating capacitor coupled between the first resonating diode and the second resonating diode, and
a second resonating inductor coupled to the first resonating capacitor, and
the first boost converter includes a first inductor and a first diode coupled to the second resonating inductor, and a first switch coupled to the second resonating inductor.
2. The motor driving device according to claim 1 , wherein the second converter of the interleaved converter includes a second boost converter, and a second resonator having a second LC circuit coupled to the second boost converter to perform resonation.
3. The motor driving device according to claim 2 , wherein:
the second resonator includes:
a third resonating diode, a fourth resonating diode, and a third resonating inductor coupled in series between the first and second nodes of the rectifier,
a second resonating capacitor coupled between the third resonating diode and the fourth resonating diode, and
a fourth resonating inductor coupled to the second resonating capacitor, and
the second boost converter includes a second inductor and a second diode coupled to the fourth resonating inductor, and a second switch coupled to the fourth resonating inductor.
4. The motor driving device according to claim 1 , wherein the first switch performs zero voltage switching based on a current flowing through the first resonating inductor and a current flowing through the second resonating inductor when the second resonating diode and the first switching element are turned on in an OFF state of the first resonating diode in the first converter.
5. The motor driving device according to claim 4 , wherein the first diode is turned off when the current flowing through the first inductor and the current flowing through the first resonating inductor become equal under a condition that the first resonating diode is maintained in an OFF state and the second resonating diode and the first switch are maintained in an ON state.
6. The motor driving device according to claim 1 , wherein a voltage across the first switch gradually increases when the first resonating diode is turned on and the first switch is turned off under a condition that the second resonating diode is maintained in an OFF state, and the first switch performs zero current switching when turned off.
7. The motor driving device according to claim 6 , wherein the first diode is turned on when a voltage between the switch and the second resonating inductor become equal to an output voltage under a condition that the second resonating diode and the first switch are maintained in an OFF state and the first resonating diode is maintained in an ON state.
8. The motor driving device according to claim 1 , further comprising:
a DC link capacitor coupled between output nodes of the interleaved converter;
an inverter having a plurality of switching elements, the inverter using an energy stored in the DC link capacitor; and
an inverter controller to control the inverter.
9. An air conditioner comprising:
a compressor to compress a refrigerant;
a heat exchanger to perform heat exchange, using the compressed refrigerant; and
a compressor motor driving device to drive a motor equipped in the compressor,
wherein the compressor motor driving device comprises:
a rectifier configured for coupling to an AC power source, and
an interleaved converter coupled to the rectifier to convert an output of the rectifier into a DC level, the interleaved converter having a first converter and a second converter configured to operate in an interleaved manner, the first converter having a first boost converter and a first resonator, and the first resonator having a first LC circuit coupled to the first boost converter to perform resonation,
wherein the first resonator includes:
a first resonating diode, a second resonating diode, and a first resonating inductor coupled in series between first and second nodes of the rectifier,
a first resonating capacitor coupled between the first resonating diode and the second resonating diode, and
a second resonating inductor coupled to the first resonating capacitor, and
the first boost converter includes a first inductor and a first diode coupled to the second resonating inductor, and a first switch coupled to the second resonating inductor.
10. The air conditioner according to claim 9 , wherein the first switch performs zero voltage switching based on a current flowing through the first resonating inductor and a current flowing through the second resonating inductor when the second resonating diode and the first switching element are turned on in an OFF state of the first resonating diode in the first converter.
11. The air conditioner according to claim 10 , wherein the first diode is turned off when the current flowing through the first inductor and the current flowing through the first resonating inductor become equal under a condition that the first resonating diode is maintained in an OFF state and the second resonating diode and the first switch are maintained in an ON state.
12. The air conditioner according to claim 9 , wherein a voltage across the first switch gradually increases when the first resonating diode is turned on, and the first switching element is turned off under a condition that the second resonating diode is maintained in an OFF state, and the first switch performs zero current switching when turned off.
13. The air conditioner according to claim 12 , wherein the first diode is turned on when a voltage between the first switch and the second resonating inductor become equal to an output voltage under a condition that the second resonating diode and the first switch are maintained in an OFF state and the first resonating diode is maintained in an ON state.
14. A motor driving device comprising:
a rectifier to rectify input AC power; and
a converter to convert the power rectified by the rectifier into DC power,
wherein the converter includes a boost converter and a resonator connected to the boost converter to perform resonation,
wherein the resonator includes:
a first resonating diode, a second resonating diode, and a first resonating inductor coupled in series between first and second nodes of the rectifier,
a first resonating capacitor coupled between the first resonating diode and the second resonating diode, and
a second resonating inductor coupled to the first resonating capacitor, and
the boost converter includes a first inductor and a first diode coupled to the second resonating inductor, and a first switch coupled to the second resonating inductor.
15. The motor driving device according to claim 14 , wherein the first switch performs zero voltage switching based on a current flowing through the first resonating inductor and a current flowing through the second resonating inductor when the second resonating diode and the first switch are turned on in an OFF state of the first resonating diode in the resonator.
16. The motor driving device according to claim 15 , wherein a voltage across the first switch gradually increases when the first resonating diode is turned on and the first switch is turned off under a condition that the second resonating diode is maintained in an OFF state, and the first switch performs zero current switching when turned off.
17. The motor driving device according to claim 14 , further comprising:
a DC link capacitor coupled to output nodes of the converter;
an inverter having a plurality of switching elements, the inverter using an energy stored in the DC link capacitor; and
an inverter controller to control the inverter.