Lg Electronics Inc.

Songhee Yang

Jeongeon Oh

Sanghyeon Kim

Phillsik Gong

Yonghwa Lee

The present disclosure discloses a power transforming apparatus capable of reducing a stress of a converter switch during a PFC operation, an operation method thereof, and an air conditioner including the same. To this end, the power transforming apparatus according to the present disclosure may determine the number of converters for performing the PFC operation based on a magnitude of input power and a speed of the motor. Furthermore, the PFC operation may be performed using only one converter when determining a low-load in order to improve efficiency. In addition, a target converter channel may be selected using a random function or determined to be changed using a previous operation history without specifying a target converter channel in advance at an initial stage of the PFC operation so as not to add a stress to any one converter switch.

Power transforming apparatus and air conditioner including the same

The present disclosure discloses a power transforming apparatus capable of reducing a stress of a converter switch during a PFC operation, an operation method thereof, and an air conditioner including the same. To this end, the power transforming apparatus according to the present disclosure may determine the number of converters for performing a PFC operation based on a magnitude of input power and a speed of the motor. Furthermore, target converter channels are arbitrarily selected using a random function at an initial stage of a PFC operation so as not to add a stress to a switch device of any one converter. In addition, in order to disperse a stress to all switches, phases are individually controlled to perform switching operations while changing converters that match the number of converters for performing a PFC operation in a preset cycle, for example, whenever a zero-crossing is detected.

A motor driving device and an air conditioner having the same of the present disclosure limits the switching of a winding switching device when there is a possibility that the winding switching device is deteriorated, in order to increase the life of winding switching device of a motor and prevent malfunction.

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Seoul, South Korea

Songhee Yang