The pulse width modulation (PWM) control for Lagrange systems driven by servo motors in stochastic environment is researched in this paper. Principles of PWM for stochastic nonlinear systems are proved, a continuous c...
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The pulse width modulation (PWM) control for Lagrange systems driven by servo motors in stochastic environment is researched in this paper. Principles of PWM for stochastic nonlinear systems are proved, a continuous control bounded in probability of stochastic Lagrange system is designed, and the stochastic closed-loop nonlinear programming is modeled in the same form as that in the deterministic case. Sure boundedness of the control is required as a hard constraint, and the stochastic quadratic programming problem is presented for which an analytic solution is constructed and the expression of the optimal duty ratio is obtained. Finally, the main procedures of design and implementation of the stochastic PWM are summarized, and the effectiveness of the proposed scheme is demonstrated by a simulation of articulated manipulator.& COPY;2023 Elsevier Ltd. All rights reserved.
Compared with conventional space vector pulse width modulation (SVPWM), discontinuous pulse width modulation (DPWM) technique is esteemed for lower switching losses and more flexible sampling options. Moreover, the th...
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This paper proposes a control method with control frequency asynchronous to pulse width modulation (PWM) frequency for Vienna rectifier to enhance the stability when connected to the grid. By analyzing the bode diagra...
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Microwave wireless power transfer (MWPT) can realize long-range power transmission compared with other wireless power transfer techniques. The traditional MWPT system is based on a continuous power supply structure. W...
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Space vector pulse width modulation is an advanced modulation algorithm which offers many advantages over the sinusoidal pulse width modulation technique. Space vector pulse width modulation is a well-researched topic...
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Space vector pulse width modulation is an advanced modulation algorithm which offers many advantages over the sinusoidal pulse width modulation technique. Space vector pulse width modulation is a well-researched topic for three-phase inverters, but only a very few works have been reported in the literature on the application of the space vector pulse width modulation technique for single-phase inverters. Conventional space vector pulse width modulation algorithms for single-phase inverters have concentrated mainly on two-level inverters where the reference vector falls only in two sectors. But for single-phase multilevel inverters, the switching patterns in different sectors are to be properly controlled for generating the desired number of levels. This paper proposes a new space vector pulse width modulation algorithm for single-phase multilevel inverter which incorporates an efficient algorithm for the proper selection of switches in different sectors to get the desired number of levels in the output voltage. The proposed algorithm is implemented on a simplified seven-level inverter which uses fewer numbers of switches in comparison with the conventional cascaded multilevel converter. The validity of the suggested space vector pulse width modulation technique is verified through simulations and experiments.
—The switching of the switch will produce a lot of electromagnetic interference (EMI). The time scale of the dead zone is very small, and the actual conduction situation is determined by the direction of the current,...
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This paper examines several sinusoidal pulse-widthmodulation (SPWM) methods for single-phase H-Bridge inverters. Various SPWM strategies have been proposed in the literature up to this point. With PWM, the inverter&#...
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This article presents the application of the space vector pulse width modulation (SVPWM) algorithm to build simulation models of longitudinal motorcycle dynamics and 3-phase induction motors (TIM). The idea of SVPWM i...
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The pulse width modulation (PWM) technique is extensively employed in permanent magnet synchronous motor (PMSM) drives, which is classified into continuous PWM and discontinuous PWM (DPWM). The continuous PWM is more ...
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In this study, we have investigated the operation robustness of a p-type low-temperature polycrystalline silicon (LTPS) thin-film transistor (TFT)-based micro light-emitting diode (mu LED) pixel circuit adopting pulse...
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In this study, we have investigated the operation robustness of a p-type low-temperature polycrystalline silicon (LTPS) thin-film transistor (TFT)-based micro light-emitting diode (mu LED) pixel circuit adopting pulse width modulation (PWM) under circuit component fluctuations. The wavelength shift of mu LEDs, depending on the current density, was suppressed by implementing PWM. The PWM pixel circuit controlled the emission time with constant mu LED current in the simulated and measured results. In addition, the wavelength shift was suppressed below 0.48% within the 10-bit grayscale range. Furthermore, the component tolerance of the pixel circuit was investigated by simulating the error rate of mu LED emission time with varying threshold voltage, mobility, subthreshold swing, and capacitance. The pixel circuit exhibited a robust operation with a maximum error rate of 4.0% under a component fluctuation of +/- 10%. Consequently, the mu LED pixel circuit adopting PWM suppressed the wavelength shift of mu LEDs and demonstrated robust circuit operation under component fluctuation.
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