PURPOSE: A display device and a voice control method thereof are provided to assign an identifier... more PURPOSE: A display device and a voice control method thereof are provided to assign an identifier to each icon based on set references and select an icon corresponding to the identifier and perform a corresponding function if a user pronounces the identifier. CONSTITUTION: If a voice recognition mode starts, a control unit(130) assign different identifiers to icons respectively at an icon display location. The control unit displays the identifier on the icons by control of a display unit(120). If a voice for an identifier is received through a voice input unit(110), the control unit selects an icon corresponding to the inputted identifier.
2011 IEEE Energy Conversion Congress and Exposition, 2011
This paper presents the development and implementation of an online voltage disturbance estimator... more This paper presents the development and implementation of an online voltage disturbance estimator to achieve the precise torque control of interior permanent magnet synchronous motors (IPMSMs) over a wide operating region. Different design methodologies for disturbance extraction are analyzed using a complex vector frequency-response function (FRF) and evaluated in terms of estimation accuracy. The proposed design has a form of the state-filter based on a Luenburger-style closed-loop stator current vector observer. We provide an accurate torque control strategy with the estimated disturbance, which is based on a torque command manipulation. In addition, the developed estimator is proven to work with any torque control schemes incorporating even with numerous lookup tables. The proposed disturbance estimation scheme has the advantage of being general and readily applicable to a wide range of other systems, such as PWM converters and symmetric machines.
Applied Power Electronics Conference and Exposition Annual IEEE Conference, 2007
This paper presents a minimization technique of the position detection error resulting from the z... more This paper presents a minimization technique of the position detection error resulting from the zero current clamping (ZCC) effect for pulsating high-frequency (HF) signal injection-based sensorless drives. An analytical model is derived to obtain an accurate map of the ZCC effect of the PWM inverter. This model is universally agreed upon and subsequently incorporated into the development of a specialized
... devices; 3) the dc-link voltage; 4) the voltage drops across the switches; and 5) the slope o... more ... devices; 3) the dc-link voltage; 4) the voltage drops across the switches; and 5) the slope of the rising and falling edges of the output voltage from the parasitic capacitance of devices. ... CONCLUSION This paper proposes an SVR-based estimation/compensation method of ...
PURPOSE: A display device and a voice control method thereof are provided to assign an identifier... more PURPOSE: A display device and a voice control method thereof are provided to assign an identifier to each icon based on set references and select an icon corresponding to the identifier and perform a corresponding function if a user pronounces the identifier. CONSTITUTION: If a voice recognition mode starts, a control unit(130) assign different identifiers to icons respectively at an icon display location. The control unit displays the identifier on the icons by control of a display unit(120). If a voice for an identifier is received through a voice input unit(110), the control unit selects an icon corresponding to the inputted identifier.
2011 IEEE Energy Conversion Congress and Exposition, 2011
This paper presents the development and implementation of an online voltage disturbance estimator... more This paper presents the development and implementation of an online voltage disturbance estimator to achieve the precise torque control of interior permanent magnet synchronous motors (IPMSMs) over a wide operating region. Different design methodologies for disturbance extraction are analyzed using a complex vector frequency-response function (FRF) and evaluated in terms of estimation accuracy. The proposed design has a form of the state-filter based on a Luenburger-style closed-loop stator current vector observer. We provide an accurate torque control strategy with the estimated disturbance, which is based on a torque command manipulation. In addition, the developed estimator is proven to work with any torque control schemes incorporating even with numerous lookup tables. The proposed disturbance estimation scheme has the advantage of being general and readily applicable to a wide range of other systems, such as PWM converters and symmetric machines.
Applied Power Electronics Conference and Exposition Annual IEEE Conference, 2007
This paper presents a minimization technique of the position detection error resulting from the z... more This paper presents a minimization technique of the position detection error resulting from the zero current clamping (ZCC) effect for pulsating high-frequency (HF) signal injection-based sensorless drives. An analytical model is derived to obtain an accurate map of the ZCC effect of the PWM inverter. This model is universally agreed upon and subsequently incorporated into the development of a specialized
... devices; 3) the dc-link voltage; 4) the voltage drops across the switches; and 5) the slope o... more ... devices; 3) the dc-link voltage; 4) the voltage drops across the switches; and 5) the slope of the rising and falling edges of the output voltage from the parasitic capacitance of devices. ... CONCLUSION This paper proposes an SVR-based estimation/compensation method of ...
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Papers by Chanhee Choi