Samsung Electronics Co., Ltd.

Seon Gu Lee

Pyeong Ki Park

Hyun Chang Cho

Sung In Park

Jae Shik Jeong

Jeong Ho Seo

Koji Hamaoka

Hyo Jea Shin

Ah Young Lee

Ho Hyun Ryu

Yoon Kyunh Cho

Gi Hyeong Lee

Takeda Yoshihiko

A vacuum cleaner includes a fan motor configured to generate suction, an input button configured to receive an input of a user, a first power supply circuit configured to convert alternating current (AC) power supplied from an external power source and output first direct current (DC) power, a second power supply circuit configured to store electric energy upon receiving the first DC power, and output second DC power based on the stored electric energy, a driver circuit configured to drive the fan motor upon receiving at least one of the first DC power and the second DC power, a first semiconductor switching circuit configured to control the first DC power supplied to the second power supply circuit, a second semiconductor switching circuit configured to control the first DC power and the second DC power that are supplied to the driver circuit, and a microprocessor configured to output a control signal for turning on or off the first semiconductor switching circuit and the second semiconductor switching circuit depending on the user input and a connection state of the external power source.

Vacuum cleaner and method of controlling the same

A motor driving apparatus and a refrigerator using the same is provided. The refrigerator may include a compressor, a motor, a driving unit, temperature sensing units sensing the temperatures of storage chambers and an external temperature, and a control unit selecting a driving mode of the driving unit based on the sensing result of the temperature sensing units and controlling the driving unit to drive the motor according to the selected driving mode. In a general operation mode, the control unit controls the driving unit to drive the motor in a 120 degree conduction method, and in a power-saving operation mode, the control unit controls the driving unit to drive the motor in a 90 degree conduction method. The refrigerator increases a pulse width of driving current by converting the conduction method of the motor to drive the motor at a low speed during power-saving operation of the refrigerator.

BLDC motor driving apparatus and refrigerator using the same

Growing community of inventors

Yongin-si, South Korea

Seon Gu Lee