This study proposes a space vector pulse width modulation (SVPWM) driving method for the switched reluctance motor (SRM), which enables the use of a standard full-bridge power converter to drive a three-phase SRM with...
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This study proposes a space vector pulse width modulation (SVPWM) driving method for the switched reluctance motor (SRM), which enables the use of a standard full-bridge power converter to drive a three-phase SRM with a ring structure, in place of the traditional asymmetric H-bridge (AHB). Based on this driving topology, the SVPWM approach is employed to drive the SRM, and its performance is compared with that of the conventional SRM driving method utilising the AHB. The findings indicate that the SVPWM method can effectively reduce torque ripple in the SRM. Moreover, the experimental validation performed to verify the proposed driving topology and method yields results that closely align with the simulated outcomes.
Herein, we proposed a micro light-emitting diode (mu LED) pixel circuit based on indium-gallium-zinc oxide (IGZO) thin-film transistors (TFTs). pulse-widthmodulation (PWM) was utilized to overcome the wavelength shif...
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Herein, we proposed a micro light-emitting diode (mu LED) pixel circuit based on indium-gallium-zinc oxide (IGZO) thin-film transistors (TFTs). pulse-widthmodulation (PWM) was utilized to overcome the wavelength shift of the mu LEDs. The proposed pixel circuit compensated for the threshold voltage (V-TH) of the driving TFTs using a source-follower structure and the variation of mu LED forward voltage (Delta V-LED). The proposed mu LED pixel circuit successfully expressed 256 gray levels using PWM. In addition, the proposed circuit exhibited a normalized luminance error rate lower than 4.8% under V-TH variation (Delta V-TH) of +/- 1.0 and Delta V-LED of +/- 0.4 V. Consequently, the proposed mu LED pixel circuit based on IGZO TFTs successfully expressed gray levels using PWM and operated stably under Delta V-TH and Delta V-LED.
We report a micro light-emitting diode (mu LED) pixel circuit using low-temperature poly-Si oxide (LTPO) thin film transistors (TFTs). The pixel circuit operates by pulse width modulation (PWM) to prevent the waveleng...
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We report a micro light-emitting diode (mu LED) pixel circuit using low-temperature poly-Si oxide (LTPO) thin film transistors (TFTs). The pixel circuit operates by pulse width modulation (PWM) to prevent the wavelength shift of mu LED. The proposed PWM can support 10-bit gray scale at a refresh rate of 120 Hz by PWM, thanks to the fast rise and fall times. Note that the circuit also compensates for the variation of the threshold voltage (VTH) of the TFTs in the pixel. It is found that the current error rate is 3.7%, and the maximum pulsewidth error rate is 3.4% for low gray levels when the VTH shift is 0.5 V. The fabricated pixel circuit successfully demonstrates PWM of variable gray levels, with measured rise and fall times of 3 mu s and 0.3 mu s, respectively. Therefore, the proposed pixel circuit is suitable for mu LED display capable of expressing 10-bit gray scale at a refresh rate of 120 Hz.
positive-feedback (PF) device and its operation scheme to implement pulse width modulation (PWM) function were demonstrated. First, the device operation mechanism for the PWM function was analyzed. By adjusting the am...
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positive-feedback (PF) device and its operation scheme to implement pulse width modulation (PWM) function were demonstrated. First, the device operation mechanism for the PWM function was analyzed. By adjusting the amount of the charge stored in the n- floating body (Q(n)), the potential of the floating body changes linearly with time. When Q(n) reaches to a threshold value (Q(th)), the PF device turns on abruptly. From the linear time varying property of Q(n) and the gate bias dependency of Q(th), voltage-to-pulsewidth conversion for the PWM function was implemented. A rectified linear or hard-sigmoid activation function was successfully obtained from a single PF device, and it is beneficial to extremely reduce the area of a PWM neuron.
Increasing gasoline prices and pollution levels make EVs an increasingly attractive and environmentally friendly alternative to gasoline. This paper presents an efficient charging solution for EVs based on the integra...
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-The increasing number of fatalities in nations across the world because of a deficiency of protective technology in automobiles has created a chaotic scene in recent years. However, the car driver's Perception-Re...
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-The increasing number of fatalities in nations across the world because of a deficiency of protective technology in automobiles has created a chaotic scene in recent years. However, the car driver's Perception-Reaction Time (PRT) plays an important variable during such accidents and emergencies. The Anti-Lock Braking System (ABS) seems a viable technology, which today is used to prevent tires from sliding during quick brakes, whereas EBS is designed for braking assistance during tuning or emergency braking. Physical weight, rotational rigidity, diameter, and tire material strength of the vehicle are all used to simulate them. Advance Driver Assistance Systems (ADAS), which include Anti-lock brakes (ABS) and Emergency Braking Systems (EBS), are the foremost viable technique for minimizing the environmental impact and uncertainties of driving road transportation. The presented systematic review aims to deliver a ground-level analysis that can be used to enhance the safety of motor vehicle driving, reduce wheel slip to achieve the best possible stopping distance in commercial and specialized vehicles, and influence future transportation. In this study, the most widely utilized technologies for ADAS have been reviewed and discussed. Various sensors used to improve braking and vehicle performance have been systematically studied in the context of low power-consuming techniques like pulse width modulation. An analysis of emergency braking procedures performed by riders with varying degrees of braking expertise was conducted using previously collected experimental data, and the results were used to conclude potential loss of control situations.
The CLLC resonant converters are widely used in battery charging due to their bi-directional power flow and wide voltage range. However, the converter faces the problem of low efficiency under light load using pulse f...
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ISBN:
(纸本)9798350365573;9798350365580
The CLLC resonant converters are widely used in battery charging due to their bi-directional power flow and wide voltage range. However, the converter faces the problem of low efficiency under light load using pulse frequency modulation (PFM). Phase shift modulation (PSM) methods are usually used to solve the above problem, including dual-phase-shift (DPS) modulation, but PSM methods cause high circulating current. In this paper, a dual-side center-aligned pulse width modulation (DCPWM) method is proposed to enhance the light-load efficiency. To obtain the voltage gain and time-domain expressions of the main circuit variables, a time-domain model is first built. Based on the model, the soft-switching region and the constraint relationship between the control parameters can be further determined. Consequently, the circulating current of the proposed scheme can be lower compared to DPS, which reduces the switching and core losses. The simulation verifies the effectiveness of the proposed strategy.
This paper proposes a novel spike generator for processing in memory (PIM) technology. Most of the electronics today utilize a von Neumann architecture. The von Neumann architecture suffers from the separation of memo...
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This paper proposes pulse width modulation schemes for a two-level five-phase voltage source inverter. According to the literature, the generation of a pure sinusoidal waveform requires an (n-1) number of vectors for ...
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Recently, higher display resolution of flagship smartphones has contributed to better quality 3D image rendering and mobile gaming applications. However, high-resolution displays require source-driver ICs (SD-IC) with...
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