Power supply apparatus, and electric apparatus and vacuum cleaner having the same
Disclosed herein are a power supply apparatus, and an electric apparatus and a vacuum cleaner having the power supply apparatus. According to an aspect of the present disclosure, the power supply apparatus includes: a first power converter configured to convert a first Alternating Current (AC) voltage into a Direct Current (DC) voltage; a second power converter configured to drop the DC voltage output from the first power converter and transfer the dropped DC voltage to a power storage unit, and to boost a DC voltage of the power storage unit and output the boosted DC voltage; and a third power converter configured to convert a DC voltage among the DC voltage output from the first power converter and the boosted DC voltage output from the second power converter, into a second AC voltage, and to transfer the second AC voltage to a load.
1. A power supply apparatus configured to select between an Alternating Current (AC) power supply and a battery to supply power to a motor, the power supply apparatus comprising:
a first power converter configured to convert a first AC voltage into a Direct Current (DC) voltage, when the AC power supply is selected;
a second power converter configured to drop the DC voltage output from the first power converter and transfer the dropped DC voltage to the battery when the AC power supply is selected, and to boost a DC voltage of the battery and output the boosted DC voltage when the battery is selected;
a third power converter configured to convert a DC voltage among the DC voltage output from the first power converter and the boosted DC voltage output from the second power converter, into a second AC voltage, and to transfer the second AC voltage to the motor; and
a controller configured to control the second power converter to drop and boost the DC voltage, and to control the third power converter to convert the DC voltage into the second AC voltage.
2. The power supply apparatus according to claim 1 , wherein the second power converter is a bidirectional DC-DC converter configured to drop the DC voltage output from the first power converter and transfer the dropped DC voltage in a first direction to charge the power storage unit, and to boost a charged DC voltage of the power storage unit and output the boosted DC voltage in a second direction which is opposite to the first direction to thus transfer the boosted DC voltage to the third power converter.
3. The power supply apparatus according to claim 2 , wherein the second power converter operates as a buck converter when transferring the dropped DC voltage in the first direction, and operates as a boost converter when transferring the boosted DC voltage in the second direction.
4. The power supply apparatus according to claim 3 , wherein the controller controls the second power converter to operate as the buck converter in order to transfer the DC voltage output from the first power converter to the power storage unit; and
the controller controls the second power converter to operate as the boost converter in order to boost the DC voltage of the power storage unit and transfer the boosted DC voltage to the load.
5. The power supply apparatus according to claim 1 , wherein the third power converter is an inverter configured to convert the DC voltage into the second AC voltage having a frequency and a phase required by the load.
6. The power supply apparatus according to claim 1 , wherein the first power converter is a Power Factor Corrector (PFC) configured to convert the first AC voltage into the DC voltage to suppress harmonic-wave current of the first AC voltage and improve a power factor of the first AC voltage.
7. The power supply apparatus according to claim 1 , further comprising a capacitor electrically connected between the first power converter and the second power converter,
wherein the capacitor is charged by at least one voltage of the DC voltage output from the first power converter and the boosted DC voltage output from the second power converter.
8. The power supply apparatus according to claim 7 , wherein the charged voltage of the capacitor is transferred to the third power converter.
9. The power supply apparatus according to claim 1 , further comprising an AC input detector configured to detect the first AC voltage input to the first power converter, and to transfer the result of the detection to the controller.
10. The power supply apparatus according to claim 1 , wherein the controller generates a first control signal for controlling a power transfer direction of the second power converter, and a second control signal for controlling conversion operation of the third power converter.
11. An electric apparatus comprising:
a fan;
a motor configured to rotate the fan;
a battery configured to store a voltage;
a first power converter configured to convert a first Alternating Current (AC) voltage into a Direct Current (DC) voltage, when the AC power supply is selected;
a second power converter configured to drop the DC voltage output from the first power converter and transfer the dropped DC voltage to the battery when the AC power supply is selected, and to boost a DC voltage of the battery and output the boosted DC voltage when the battery is selected;
a third power converter configured to convert a DC voltage of the DC voltage output from the first power converter and the boosted DC voltage output from the second power converter, into a second AC voltage, and to transfer the second AC voltage to the motor; and
a controller configured to control the second power converter to drop and boost the DC voltage, and to control the third power converter to convert the DC voltage into the second AC voltage.
12. The electric apparatus according to claim 11 , wherein the second power converter is a bidirectional DC-DC converter configured to drop the DC voltage output from the first power converter and transfer the dropped DC voltage in a first direction to charge the battery, and to boost a charged DC voltage of the battery and output the boosted DC voltage in a second direction which is opposite to the first direction to thus transfer the boosted DC voltage to the third power converter.
13. The electric apparatus according to claim 12 , wherein the second power converter operates as a buck converter when transferring the dropped DC voltage in the first direction, and operates as a boost converter when transferring the boosted DC voltage in the second direction.
14. The electric apparatus according to claim 13 , wherein the controller controls the second power converter to operate as the buck converter in order to transfer the DC voltage output from the first power converter to the battery; and
the controller controls the second power converter to operate as the boost converter in order to boost the charged DC voltage of the battery and transfer the boosted DC voltage to the motor.
15. The electric apparatus according to claim 11 , wherein the third power converter is an inverter configured to convert the DC voltage into the second AC voltage having a frequency and phase required by the motor.
16. The electric apparatus according to claim 11 , wherein the first power converter is a Power Factor Corrector (PFC) configured to convert the first AC voltage into the DC voltage to suppress harmonic-wave current of the first AC voltage and improve a power factor of the first AC voltage.
17. The electric apparatus according to claim 16 , wherein the PFC is an isolated PFC.
18. The electric apparatus according to claim 11 , further comprising a capacitor electrically connected between the first power converter and the second power converter,
wherein the capacitor is charged by at least one voltage of the DC voltage output from the first power converter and the boosted DC voltage output from the second power converter.
19. The electric apparatus according to claim 11 , wherein the controller generates a first control signal for controlling a power transfer direction of the second power converter, and a second control signal for controlling conversion operation of the third power converter.
20. An Alternating Current (AC)/Direct Current (DC) power supply apparatus configured to select between an AC power supply and a battery to supply power to a motor, the power supply apparatus comprising:
an isolated Power Factor Corrector (PFC) configured to convert a commercial AC voltage into a DC voltage, when the AC power supply is selected;
a bidirectional DC-DC converter configured to drop the DC voltage output from the isolated PFC and transfer the dropped DC voltage to the battery when the AC power supply is selected, and to boost a DC voltage of the battery and output the boosted DC voltage when the battery supply is selected;
an inverter configured to convert a frequency and phase of a DC voltage of the DC voltage output from the isolated PFC and the boosted DC voltage output from the bidirectional DC-DC converter, and to transfer the DC voltage with the converted frequency and phase to the motor; and
a controller configured to control the bidirectional DC-DC converter to drop and boost the DC voltage, and to control the inverter to convert the frequency and phase of the DC voltage.