Abstract: Provided is a vertical electrode structure using a trench and a method of manufacturing the vertical electrode structure. The method of forming a vertical electrode structure using a trench includes steps of: forming the trench on a predetermined region of a semiconductor substrate; and forming electrode layers in predetermined regions of inner and outer portions of the trench. In this manner, the electrode deposition in the vertical direction is established by using the trench, so that it is possible to form a deposited electrode having a size of several hundred nm or less by a short processing time and a low processing cost.

Abstract: A polishing slurry for polishing an aluminum film includes an abrasive agent, an oxidizing agent, an anti-corrosion agent, and a removal rate reducing agent that is an anionic compound exhibiting a negative charge in the slurry. The polishing slurry can be used in a method of manufacturing a semiconductor device.

Abstract: A polishing slurry includes an abrasive, a dispersion agent, a polish accelerating agent and an adhesion inhibitor. The adhesion inhibitor includes a benzene compound combined with a carboxyl group. Methods of planarizing an insulating layer using the slurry are also provided.

Abstract: Provided is an analog-to-digital converter. The analog-to-digital converter includes a resistor string for generating a plurality of reference voltages; a plurality of differential difference amplifiers for detecting zero-crossing points according to interpolation by using the plurality of reference voltages and input signals; and a plurality of comparators for receiving outputs of the plurality of differential difference amplifiers, detecting zero-crossing points according to 4X interpolation, and generating a digital code corresponding to the input signals.

Abstract: A motor system includes a BLDC (brushless direct current) motor; an inverter driving the BLDC motor; a current detector detecting a direct current of the inverter; an induced voltage detector detecting an induced voltage of the BLDC motor; and a controller controlling at least one of an output voltage and an output frequency of the inverter based on the direct current detected by the current detector and the induced voltage detected by the induced voltage detector.

Abstract: A BLDC motor phase commutation method is provided, which can correctly detect phase commutation timing and position detection timing of a BLDC motor in a compressor to stabilize rotation and RPM of the compressor, thereby minimizing noise and vibration. When the BLDC motor rotates through a mechanical angle corresponding to one period, the BLDC motor operates according to a first scheme in which operation of the BLDC motor in the first phase commutation section of a period is performed in the same manner as in the last phase commutation section of a period immediately prior to the period. After the BLDC motor switches to sensorless mode, the BLDC motor operates according to a third scheme in which the first phase commutation section of a period has a time interval equal to the average of time intervals of first phase commutation sections of periods prior to the period.

Abstract: A method of controlling the speed of a BLDC (brushless direct current) motor and a method of controlling the cooling speed of a refrigerator using the same. A method of controlling the speed of a BLDC motor includes: inputting a driving signal having a predetermined reference current applying angle to the motor to achieve a predetermined reference speed; measuring a rotating speed of the motor; increasing a current applying angle of the driving signal if the measured rotating speed does not reach the reference speed and the driving signal has reached a maximum input of the motor; and inputting the driving signal having the increased current applying angle to the BLDC motor.

Abstract: The invention provides a refrigerator having a compressor, the refrigerator including: a motor driving the compressor; a motor driver supplying power to the motor; and a controller outputting a control signal corresponding to a second command speed to the motor driver, and outputting a control signal corresponding to a first command speed which is higher than the second command speed to the motor driver when a driving on/off ratio of the motor driver is maintained below a given reference driving on/off ratio for a given reference period. Accordingly, it is an aspect of the present invention to provide a refrigerator to operate a compressor stably and easily under overload or low voltage conditions, and a method for controlling the same.

Abstract: A Brushless Direct Current (BLDC) motor starting method and device are provided. With the method and/or device, startup noise and vibration and startup failure rate can be reduced using a constant low-speed startup scheme when the BLDC motor is in startup mode. Additionally, Pulse Width Modulation (PWM) duty is also maintained at low level when the BLDC motor starts up, thereby preventing excessive current from occurring due to desynchronization of the motor at startup, so that it is possible to optimize specifications of an inverter in the BLDC motor. The BLDC motor starts up with a synchronous speed and a PWM duty of a rotor of the BLDC motor being kept constant, and the BLDC motor switches to sensorless mode if a position of the rotor is detected a predetermined number of times or more during a specific time period.

Abstract: A motor controller, including: a power supply which supplies DC power; an inverter which converts the DC power into AC power to be supplied to a motor; a shunt resistor which connects the power supply and the inverter; and a controller which supplies a control signal to the inverter to drive the motor and determines an error of the inverter when it is determined that a size of voltage between both ends of the shunt resistor is less than a predetermined first reference value. Thus, a motor controller is provided which detects an error of an inverter more easily and precisely, and a control method thereof and an error detecting apparatus of an inverter.

Abstract: A method of controlling a three-phase brushless direct current (BLDC) motor, including (a) arranging a rotor of the three-phase BLDC motor by making a current flow to two of the three phases; (b) rotating the rotor through a phase shift; (c) detecting a position detecting point of time where a sign of an inductive electromotive voltage generated by a rotation of the rotor in a non-exciting phase is initially changed; and (d) calculating a rotation speed of the rotor based on a size of the inductive electromotive voltage of the non-exciting phase detected at the position detecting point of time. Thus, provided is a brushless direct current (BLDC) motor controller and a control method thereof which precisely detects a position detecting point of time of a rotor to determine a rotation speed of a rotor and minimizes noise and vibration during an initial drive of the three-phase BLDC motor.

Abstract: A BLDC motor phase commutation method is provided, which can correctly detect phase commutation timing and position detection timing of a BLDC motor in a compressor to stabilize rotation and RPM of the compressor, thereby minimizing noise and vibration. When the BLDC motor rotates through a mechanical angle corresponding to one period, the BLDC motor operates according to a first scheme in which operation of the BLDC motor in the first phase commutation section of a period is performed in the same manner as in the last phase commutation section of a period immediately prior to the period. After the BLDC motor switches to sensorless mode, the BLDC motor operates according to a third scheme in which the first phase commutation section of a period has a time interval equal to the average of time intervals of first phase commutation sections of periods prior to the period.