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Showing 1 to 16 of 16 for “"PWM signal"”.
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All-Digital Audio Amplifier
… generates a two-level pulse-width modulation (PWM) signal that is amplified by a switching power stage and finally low-pass filtered before it is sent to a speaker. The purpose of the digital signal processing (DSP) portion of the system is to transform the original audio information into a …
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On low-pass reconstruction and stochastic modeling of PWM signals
Mathematical modeling of pulse width modulation (PWM) is given. For a band-limited, finite energy input signal, a PWM generation mechanism is investigated in linear and non-linear blocks separately. Following the common practice, a comparator block with a periodic reference signal is offered as a …
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Valve characterization to implement feed-forward control of hydraulically actuated joints
… valve given a specific pulse-width modulation (pwm) duty cycle. With a description of valve behavior, a feed-forward term can be implemented in the positional control loop of a hydraulically actuated robotic prototype. In order to isolate valve behavior, a test bed apparatus consisting of three …
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Development of repetitive current controller using raspberry PI for 3 phase active power filter for nonlinear load improvement
… is used to supply the pulse width modulation (PWM) signal to the APF. Lastly, the repetitive controller is designed so that the PWM generated is the same signal to be compensated by the APF and enhanced distorted current in power supply into the pure AC waveform. In this project, all the ideas …
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An improved perturbation and observation in MPPT control using buck-boost converter in solar panel
… device that generates a Pulse Width Modulation (PWM) signal. In order to determine the effectiveness of this project, few testings have been conducted. Finally, the control is assessed through hardware test experiment. The results of simulation and hardware experiment showed that this control …
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Digital Pulse Width Modulation: Analysis, Algorithms, and Applications
When the input to a PWM modulator is a sequence of uniformly spaced samples of the original signal, the resulting uniform-sampling PWM signal has high distortion. It is possible to eliminate the distortion completely by converting the uniform-sampling input sequence into a natural-sampling sequence …
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Development of p-resonant voltage control for dc motor using arduino
… downloaded into Arduino which will generate the PWM signal. The signal is transmitted from the gate driver to the three phase rectifier to produce a direct current voltage for the motor. The voltage produced is in accordance with the specified value at the reference voltage. The actual voltage …
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PID-hysteresis voltage control technique for three phase induction motor (matlab simulink and arduino)
… and downloads to Arduino where generates the PWM signal. The signals then send to gate driver of a three phase inverter to give a stable performance to the induction motor. The improvement of performance is by comparing the actual measured voltage of the motor with respect to their reference …
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Development of p resonant current control for dc motor by using Arduino
… model downloaded into Arduino to generate PWM signal. This signal was used to trigger the MOSFET at the rectifier circuit in order to control the current at DC motor. A set of hardware was designed and developed to demonstrate the validity of this approach. The observation and experimental …
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Digital speed and position control system incorporating an Incremental encoder
… to the motor shaft to provide the feedback speed signal to controller. Pulse Width Modulation (PWM) technique is used where its signal is generated in microcontroller. The microcontroller will send PWM signal to motor driver, vary the voltage supply of motor to maintain at constant speed. While …
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Design and Analysis of Switching Circuits for Energy Harvesting in Piezostrutures
… system driven by a Pulse-Width Modulated (PWM) signal. The fast switching system enables continuous adaptation of vibration energy control/harvesting by varying the PWM duty cycle. This contrasts with a conventional capacitance switching system that can only change the capacitance at …
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Self-synchronized converter for fast synchronization between low voltage microgrid and inverter connection
… is where the non-linear characteristic on the signal process will result the inverter control to be non-linear. Therefore, it is difficult and lengthy process to tune the PLL gains to reach suitable performance in order to synchronize the voltage, phase-angle and frequency between microgrid and …
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Reduction Of Vortex-driven Oscillations In A Solid Rocket Motor Cold Flow Simulation Through Active Control
… injection system. A Pulse Width Modulated (PWM) signal was added to the open-loop control scheme to correct for improper phasing of the secondary injection flow relative to the primary flow. This addition allowed the motor speed to be intermittently increased to a higher RPM before returning …
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Development of the Advanced Emitter Turn-Off (ETO) Thyristor
… and reduces the cost of the high power PWM voltage source converters. With this unique function, the upper and the lower ETO's within a converter phase leg can receive the ideal complementary (without dead-time) PWM signals and solve shoot-through problems. Method to measure the ETO …
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Driver Based Soft Switch for Pulse-Width-Modulated Power Converters
… goal of "soft switch" is to develop a standard PWM switch cell with built-in adaptive soft switching capabilities. Just like a regular switch, only one PWM signal is needed to drive the soft switch under soft switching condition. The core technique in soft switch development is a built-in …
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Electromagnetic Interference Attacks on Cyber-Physical Systems: Theory, Demonstration, and Defense
… waves) to manipulate safety-critic signals such as analog sensor outputs, digital data, and actuation signals have recently taken the attention. The purpose of this dissertation is to detect the weaknesses of cyber-physical systems against low-power Intentional Electromagnetic …