Abstract: A source driver includes a digital-to-analog converter that converts signals corresponding to first and second colors included in digital image data into first and second analog color data voltages, respectively, an output buffer unit including a first output buffer that alternately outputs the first color data voltage and the second color data voltage during one horizontal period, and a controller that controls the digital-to-analog converter and the first output buffer to alternately output the first color data voltage and the second color data voltage corresponding to each horizontal period for each horizontal period. The controller controls the first output buffer such that the second color data voltage is output after the first color data voltage is first output during a first horizontal period, and the first color data voltage is output after the second color data voltage is first output during a subsequent second horizontal period.

Abstract: A source driver includes a digital-to-analog converter that converts signals corresponding to first and second colors included in digital image data into first and second analog color data voltages, respectively, an output buffer unit including a first output buffer that alternately outputs the first color data voltage and the second color data voltage during one horizontal period, and a controller that controls the digital-to-analog converter and the first output buffer to alternately output the first color data voltage and the second color data voltage corresponding to each horizontal period for each horizontal period. The controller controls the first output buffer such that the second color data voltage is output after the first color data voltage is first output during a first horizontal period, and the first color data voltage is output after the second color data voltage is first output during a subsequent second horizontal period.

Abstract: There is provided a signal generator including: a signal data transmitter selectively transmitting sample data obtained by sampling a reference signal at a predetermined frequency or a preset peak value, based on a variation section of the reference signal; and a signal outputter converting the sample data or the peak value transmitted from the signal data transmitter into an analog form and outputting an output signal having a target frequency.

Abstract: The motor driving control apparatus may include: a speed-position detecting unit detecting an angular velocity and a magnetic flux angle of a rotor of a motor apparatus using currents flowing in a plurality of phases of the motor apparatus; a magnetic flux angle correcting unit determining a reference magnetic flux angle using the magnetic flux angle and outputting the reference magnetic flux angle when an error is present in the magnetic flux angle; and a controlling unit controlling driving of the motor apparatus using the angular velocity and the magnetic flux angle.

Abstract: Disclosed herein is a motor position and velocity detecting system capable of accurately detecting a position and a velocity of a motor without adding a hall sensor or the number of poles of the motor. The motor position and velocity detecting system includes: a hall sensor outputting hall signals from rotation of a motor; an edge detector detecting edge signals for the hall signals to output edge pulse signals; a peak detector detecting peak signals for the hall signals to output peak pulse signals; a position outputter connected to the edge detector and the peak detector and outputting a position of the motor; and a velocity outputter connected to the edge detector and the peak detector and outputting a velocity of the motor.

Abstract: A motor driving control apparatus may include: back-electromotive force detecting unit detecting back-electromotive force generated by a motor apparatus; a zero crossing point estimating unit estimating a zero crossing point by performing at least one of differentiation and integration on a voltage difference between the back-electromotive force and a preset reference voltage; and a controlling unit controlling phase switching of the motor apparatus using the zero crossing point.

Abstract: There is provided an apparatus and a method for controlling a motor. The apparatus for controlling a motor includes a signal detection unit detecting a first signal, a sampling unit acquiring the number of pulses of the first signal included in a predetermined sampling period, and an operation unit dividing the sampling period into a predetermined number of, a plurality of sub periods, and computing a speed of a motor by allocating predetermined weights to the number of pulses of the first signal included in the plurality of respective sub periods, wherein the operation unit computes the speed of the motor by controlling at least one of the weights and the number of sub periods when the number of pulses of the first signal included in the plurality of respective sub periods is different.

Abstract: There is provided a motor driving device including: a speed detection unit detecting a speed of a motor; a comparison unit comparing the speed of the motor detected by the speed detection unit with an external input speed; and a speed control unit outputting the reference speed as a control signal when the speed of the motor is equal to a reference speed or less and outputting a motor control signal generated based on a comparative value of the comparison unit when the speed of the motor exceeds the reference speed.

Abstract: Disclosed herein are an apparatus and a method for controlling a speed of a motor. An apparatus for controlling a spaced of a motor according to an exemplary embodiment of the present invention includes: a PWM conversion unit detecting a hall sensor signal from a motor to output a pulse width modulated signal corresponding to the detected hall sensor signal; a duty detection unit detecting a duty value of the pulse width modulated signal output by the PWM conversion unit; an error calculation unit comparing a PWM duty input from the outside with a duty detected by the duty detection unit to obtain an error; and a speed control unit controlling a speed of a motor based on an error obtained by the error calculation unit.

Abstract: There is provided a motor controlling circuit including: a hall signal level detecting unit detecting a hall signal from a hall sensor; and a signal generating unit sensing a change in a level of the hall signal to generate a motor controlling signal according to the change in the level of the hall signal, wherein the signal generating unit determines that the hall signal is maintained at a high level in a case in which a high level maintaining time of the hall signal is equal to or shorter than a preset time.

Abstract: Disclosed herein are a system and a method for controlling a speed of a motor. The method for controlling a speed of a motor includes: receiving a signal from a hall sensor of the motor to measure a current speed of the motor; comparing the current speed of the motor measured with a reference speed to calculate errors; outputting a speed control value of the motor based on the calculated errors; limiting the output speed control value to values within a predetermined range; controlling a duty or a phase of current applied to the motor according to the limited values within the predetermined range; and generating a motor driving signal based on the duty control or the phase control and applying the generated motor driving signal to the motor.

Abstract: Disclosed herein is a motor driving apparatus, including: an inverter applying a direct current voltage to the respective phases of a brushless DC (BLDC) motor by a switching operation; and a motor driver detecting counter electromotive force patterns in floating sections of the respective phases, detecting zero cross points (ZCPs) of the respective phases using the counter electromotive force patterns, and then generating a PWM signal for controlling a switching operation of the inverter and a phase switching of the respective phases using position information of the zero cross points (ZCPs).

Abstract: Disclosed herein is an apparatus for driving a motor, the apparatus including: an inverter applying a direct current voltage to each phase of a brushless direct current (BLDC) motor by a switching operation; a reference voltage generating unit generating at least one reference voltage using a voltage of a neutral point of the BLDC motor; and a motor driver detecting a zero cross point (ZCP) of back electromotive force of each phase by comparing a phase voltage of each phase of the BLDC motor with the reference voltage and generating a PWM signal for controlling the switching operation of the inverter and a phase switching of each phase using information of a position of the zero cross point (ZCP).

Abstract: An apparatus for controlling a speed of a motor, includes: a first duty change detection unit detecting a change in duty of a PWM signal supplied from the outside; a speed conversion unit converting a speed indication (command) having the PWM signal into an actual speed value (RPM value) based on the change in duty detected by the first duty change detection unit; a speed control unit generating a new speed indication value to be applied to a motor and determining the duty value of PWM signal based on the new speed indication value; a second duty change detection unit detecting the change in the duty value of PWM signal determined by the speed control unit; and a PWM generation unit generating the PWM signal actually applied to the motor based on the change in the duty value detected by the second duty change detection unit.

Abstract: There are provided an apparatus and a method for controlling a motor. The apparatus for controlling a motor includes a signal generation unit generating a first signal indicating position information of a rotor, a counter unit sampling the first signal with a second signal different from the first signal for one period to count a sampling frequency, a memory unit storing a section counter value and an error value obtained by sampling a period immediately prior to the first signal with the second signal, and a comparison unit increasing and reducing an output signal when the sampling frequency counted by the counter unit coincides with the section counter value, wherein the comparison unit sums the sampling frequencies corresponding to error values with the sampling frequency of the first signal before the counter unit ends the sampling of one period of the first signal.

Abstract: There are provided a circuit and a method for detecting a duty ratio of a PWM signal. The circuit includes: a counting unit counting a PWM signal; a detection indication determining unit determining whether a detection indication signal indicating a start of detection of the duty ratio of the PWM signal has been input; an edge detecting unit detecting a preset PWM edge of the PWM signal; and a duty calculating unit calculating the duty ratio of the PWM signal using a count value during a section from a k-th point in time (T(k)) (k being a natural number of 1 or more) at which the PWM edge is detected after it is determined that the detection indication signal has been input to a k+1-th point in time (T(k+1)) at which the PWM edge is detected after it is subsequently determined that the detection indication signal has been input.

Abstract: The present invention relates to a motor controller which includes a motor; an oscillator for generating a clock signal; a speed detection unit for detecting the rotational speed of the motor from a pulse signal generated according to the rotation of the motor and the clock signal; and a sampling period determination unit for determining a sampling period by compensating an error generated in the oscillator and provides an useful effect that can precisely control the rotational speed of the motor in spite of the error of the oscillator.

Abstract: There is provided a method of controlling a BLDC motor driving device, including aligning a rotor; storing alignment information of the rotor, determining whether the alignment of the rotor is correct or incorrect, and realigning the rotor based on the alignment information.

Abstract: There are provided a motor control apparatus and method. The motor control apparatus includes: a signal generating unit generating a first signal; a sampling unit obtaining the numbers of pulses of the first signal included in a plurality of sampling sections having different start timings, respectively; and a calculating unit calculating a speed of a motor using the numbers of pulses of the first signal obtained with respect to the plurality of sampling sections.

Abstract: Disclosed herein are a system and a method for controlling a speed of a motor. The method for controlling a speed of a motor includes: receiving a signal from a hall sensor of the motor to measure a current speed of the motor; comparing the current speed of the motor measured with a reference speed to calculate errors; outputting a speed control value of the motor based on the calculated errors; limiting the output speed control value to values within a predetermined range; controlling a duty or a phase of current applied to the motor according to the limited values within the predetermined range; and generating a motor driving signal based on the duty control or the phase control and applying the generated motor driving signal to the motor.