Washing machine and controlling method thereof

A washing machine comprising:

• a case;
• a laundry inlet through which laundry is loaded, the laundry inlet being disposed in an upper portion or a lateral surface of the case;
• a door attached to the laundry inlet;
• a fixed tank configured to store water for washing the laundry;
• a rotating tank within the fixed tank and capable of rotating, the rotating tank including a container;
• and
• a power conversion device configured to drive a motor that rotates the rotating tank, wherein the power conversion device comprises:
• a first rectifier configured to rectify an alternating current (AC) voltage of an input power supply and provide a first DC voltage based on rectifying the AC voltage;
• a direct current (DC) link capacitor configured to smooth the first DC voltage provided by the first rectifier and output a smoothed DC voltage;
• an inverter configured to convert the smoothed DC voltage output by the DC link capacitor into an AC voltage for driving the motor;
• the motor, wherein the motor is driven by the AC voltage provided by the inverter and is configured to rotate the rotating tank based on the AC voltage;
• a first power converter connected to both ends of the DC link capacitor or both ends of the input power supply and configured to generate and supply a second DC voltage to a load;
• the load, wherein the load is capable of being driven by the second DC voltage supplied by the first power converter;
• a second power converter connected to the both ends of the DC link capacitor and configured to convert the smoothed DC voltage provided by the DC link capacitor into a third DC voltage and charge an energy storage device with the third DC voltage, based on a voltage across the both ends of the DC link capacitor becoming greater than or equal to than a first certain voltage, wherein an increase of the voltage at the both ends of the DC link capacitor is caused by deceleration of the motor;
• and
• a processor configured to control respective operations of the first power converter and the second power converter.