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Abstract

A power supply device and method improve space utilization and reduce power consumption and costs by implementing a voltage doubler based on the voltage of input power and driving a switching unit to thereby optimize leakage current. The power supply device comprises: a first power converter modulating a first voltage of a power source and converting a frequency of the first voltage to output a second voltage lower than the first voltage; a second power converter converting a frequency of the second voltage to output a third voltage lower than the second voltage and a fourth voltage between the first voltage and the third voltage; a controller receiving the third voltage; a switch drive outputting a fifth voltage higher than the first voltage using the first and fourth voltages; and a switch unit controlling connection between the power source and a motor in response to the fifth voltage.

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