Abstract: An apparatus for controlling a BLDC motor includes a frequency controller configured to increase frequency of a drive signal that is applied to the motor to reach a first target speed at a relatively low speed region. The apparatus also includes a sensorless controller configured to observe location of a rotor of the motor at the low speed region, and provide a control signal to the motor by comparing a command speed with an estimated speed based on detection of a voltage and/or a current of the motor at a relatively high speed region. Further, the apparatus includes a control unit configured to select one of the frequency controller and the sensorless controller based on the speed of the motor.

Abstract: An apparatus and method for supplying a direct current power source which is capable of compensating a power factor of an input power source by detecting an input current amount according to load changes, the apparatus comprising an input current detecting unit for detecting an input current amount to determine a load size, a power factor control unit for outputting a power factor control signal and an input current amount control signal according to the determined load size, an input current refluxing unit for refluxing the input current by cutting off an input power source based upon the input current amount control signal, an active filter for reducing a harmonic of the input current, rectifying an input alternating current (AC) voltage and boosting a smoothing voltage, a power factor compensating unit for supplying charged energy to the load based upon the power factor control signal, a smoothing unit for smoothing the rectified input AC voltage into a direct current (DC) voltage, and an inverter for conv

Abstract: An apparatus and method for controlling an air conditioner capable of reducing a fabrication cost by using one high-speed microcomputer and one port-ex-tension microcomputer, enhancing a reliability thereof by reducing a data communication amount between the microcomputers, and implementing a simple circuit construction. The apparatus for controlling an air conditioner comprising: a converter for converting an alternating current voltage (ACV) into a direct current voltage (DCV), and boosting the DCV; a smoothening unit for smoothening the DCV from the converter; an inverter for converting the smoothened DCV into an ACV; and a motor, comprises: a supplementary microcomputer for controlling a valve for controlling a refrigerant flow inside a pipe of the air conditioner and a relay for controlling a current flow by receiving a control signal; and a main microcomputer for entirely controlling the air conditioner with the real-time controlling unit of the air conditioner and the supplementary microcomputer.

Abstract: An apparatus and method for supplying a direct current power source capable of compensating a power factor of an input power source by increasing and decreasing energy required by load changes, the apparatus comprising: an input current detecting unit for detecting an input current amount to determine a load size, a switching control unit for outputting a switching control signal to compensate a power factor of an input power source based upon the determined load size, a filtering/rectifying unit for reducing a harmonic of the input current and rectifying an input AC voltage, a power factor compensating unit for supplying charged energy to the load based upon the switching control signal, a smoothing unit for smoothing the rectified input AC voltage into a DC voltage, and an inverter for converting the smoothed DC voltage into an AC voltage and outputting the converted AC voltage to drive the load, whereby the power factor compensation (PFC) standard can be satisfied although the load is increased, and a fabr

Abstract: An apparatus and method for supplying a direct current power source capable of compensating a power factor of an input power source by increasing and decreasing energy required by load changes, the apparatus comprising: an input current detecting unit for detecting an input current amount to determine a load size, a switching control unit for outputting a switching control signal to compensate a power factor of an input power source based upon the determined load size, a filtering/rectifying unit for reducing a harmonic of the input current and rectifying an input AC voltage, a power factor compensating unit for supplying charged energy to the load based upon the switching control signal, a smoothing unit for smoothing the rectified input AC voltage into a DC voltage, and an inverter for converting the smoothed DC voltage into an AC voltage and outputting the converted AC voltage to drive the load, whereby the power factor compensation (PFC) standard can be satisfied although the load is increased, and a fabr

Abstract: An apparatus and method for supplying a direct current power source which is capable of compensating a power factor of an input power source by detecting an input current amount according to load changes, the apparatus comprising an input current detecting unit for detecting an input current amount to determine a load size, a power factor control unit for outputting a power factor control signal and an input current amount control signal according to the determined load size, an input current refluxing unit for refluxing the input current by cutting off an input power source based upon the input current amount control signal, an active filter for reducing a harmonic of the input current, rectifying an input alternating current (AC) voltage and boosting a smoothing voltage, a power factor compensating unit for supplying charged energy to the load based upon the power factor control signal, a smoothing unit for smoothing the rectified input AC voltage into a direct current (DC) voltage, and an inverter for conv