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Pulse-width modulation (PWM), also known as pulse-duration modulation (PDM) or pulse-length modulation (PLM), is any method of representing a signal as a rectangular wave with a varying duty cycle (and for some methods also a varying period). PWM is useful for controlling the average power or amplitude delivered by an electrical signal.
Based on an introduction of basic PWM principles this book analyzes three major challenges for PWM on system performance: power losses, voltage/current ripple and electromagnetic interference (EMI) noise, and the lack of utilization of control freedoms in conventional PWM technologies.
The dependency of the PWM signal distortion on the self-oscillating frequency is shown in Fig. 17 frequency (input amplitude of − 10 dBFS, and frequency of 10 kHz) for both BAPWM and HAPWM. This figure reveals that both modulators provided a better THD performance when the self-oscillating frequency is increased.
These PWM strategies will have high switching frequency due to which power losses are more and hence efficiency will be less. Power losses can be reduced by reducing switching frequency of modulation strategy.
Another common application is in robotics where PWM signals are used to control the speed of the robot by controlling the motors. PWM techniques would typically be used to make some indicator (like an LED) soft blink. The light will slowly go from dark to full intensity, and slowly dimmed to dark again. Then it repeats.
With the prediction model, two major advanced PWM methods are introduced: variable switching frequency PWM and phase-shift PWM, which can reduce the power losses and EMI for the system based on the prediction model. Furthermore, the advanced PWM can be applied in advanced topologies including multilevel converters and paralleled converters.
This article proposes a novel control strategy called a 120° bus clamped PWM (120BCM). The 120BCM modulates the DC bus and uses a smaller DC bus capacitor value, …
The dependency of the PWM signal distortion on the self-oscillating frequency is shown in Fig. 17 frequency (input amplitude of − 10 dBFS, and frequency of 10 kHz) for both …
Abstract: This paper proposes enhanced pulse width modulation (PWM) techniques for the single-phase five level neutral point clamped inverter. In comparison with the traditional modulation …
This paper proposes a novel Pulse Width Modulation (PWM) switching technique based on Optimized Carrier Peaks-PWM (OCP-PWM) which can be used to control …
Based on an introduction of basic PWM principles this book analyzes three major challenges for PWM on system performance: power losses, voltage/current ripple and electromagnetic …
El PWM, como concepto general, es la abreviatura de Pulse Width Modulated, lo cual se utiliza como atributo para una señal de control que generalmente se utiliza para regular la potencia o velocidad a la que un …
2.8k,3,6。PDM(pulse density modulation),PWM(pulse width modulation),PWM,PDM …
Phase shift pulse width modulation (PS-PWM), Level shift pulse width modulation (LS-PWM), Phase opposition disposition level shifted pulse width modulation (PODLS-PWM), …