A Pseudo-Natural Sampling Algorithm for Low-Cost Low-Distortion Asymmetric Double-Edge PWM Modulators

Zhang, Yu; Fan, Yangyu; Shi, Lei; Lv, Guoyun

doi:10.1007/s00034-014-9877-3

Cited by 7 publications

(3 citation statements)

References 20 publications

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“…For symmetric PWM the complete output is (9) which is the sum of the outputs of the discrete-time convolution (indicated with ) of the kernel and the odd powers of the modulating signal . For trailing and leading edge PWM the even kernels and even powers of the modulating signal are also present: (10) where the kernel can be either for trailing edge or for leading edge. For the three types of symmetry, (9) and (10) represent a diagonal Volterra model as in (2).…”

Section: Volterra Kernels Using An Ideal Analog Low-pass Filtermentioning

confidence: 99%

“…A great research effort has been centered on analyzing PWM nonlinearity in the frequency domain [6]- [8]. Also, many compensation methods, mostly based on imitating the behavior of analog PWM have been presented in recent decades, such as the pioneer work of Goldberg and Sandler [9] and also in recent works [10]. All these methods require without exception a high PWM frequency which increases power losses.…”

Section: Introductionmentioning

confidence: 99%

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Volterra Models for Digital PWM and Their Inverses

Chierchie

Aase

2015

IEEE Trans. Circuits Syst. I

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In an all-digital class-D audio amplifier each signal sample is mapped into a pulse using digital pulse-width-modulation (PWM), and this intrinsically generates nonlinear distortion. This article develops discrete-time Volterra models for digital PWM. The analysis considers two types of demodulation filter, an ideal filter which provides insight into the behavior of the PWM itself, and an analog low-order demodulator filter which models the interaction of the PWM mapping with a real demodulator filter. Symmetric, trailing edge, and leading edge PWM are considered. Using the Volterra models, formulae for the inverse systems are developed. This facilitates digital precompensation of the above mentioned distortion by digitally pre-filtering the modulating signal prior to the PWM mapping. This method is first simulated and compared to pseudo-natural PWM, a well-known method for PWM distortion reduction. Moreover, the method is verified by real measurements from a physical realization of the prefilter setup using real-time digital signal processing.

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Section: Volterra Kernels Using An Ideal Analog Low-pass Filtermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Volterra Models for Digital PWM and Their Inverses

Chierchie

Aase

2015

IEEE Trans. Circuits Syst. I

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“…A wide range of calculations can be performed with a low cost microcontroller [7]. In some applications with asymmetric double-edge PWMA, complete experimental system comprising a front-end board, an FPGA board functioning as an ADPWM modulator and an eighth-order analog active low-pass filter board is developed [8]. Also, an interesting application for PWM is image processing circuit that performs a directional pixel-state propagation algorithm based on a pixel-parallel architecture, using low-cost devices [9].…”

Section: Introductionmentioning

confidence: 99%

Universal microprocessor controlled power regulator with and without additional power supply

Vučković

Blond

2020

FACTA U EE

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Inexpensive microcontrollers allow complex control methodologies for improving well-established technologies such as resistive lighting. In this paper, we present two constructions of a microprocessor controlled power regulator for resistive load of up to 2.5 kW and exemplify its use for the lamps in Tesla's Fountain reconstruction project. These are universal power controllers and could be applied to a wide verity of non-inductive loads, but our primary intention was to construct a miniature light regulator with touch sensor for Tesla's Fountain. The devices operate using the phase control of the power grid's alternating current and controlled fade-in to increase lamp longevity. Extensive testing shows the device to operate successfully for 2400 hours of continuous error-free operation, to robustly handle high cycling stresses and increase bulb lifetimes by approximately a factor of 7-8. The microcontroller software can easily be adapted for controlling many non-inductive apparatus, like light bulbs or halogen lamps, as well as resistive heating. We also used advanced technologies from other multidisciplinary areas to complete project.

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Spectral Analysis of UPWM Signals for Filterless Digital Class D Power Amplifiers

Zhang

Chen

et al. 2019

Circuits Syst Signal Process

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A Pseudo-Natural Sampling Algorithm for Low-Cost Low-Distortion Asymmetric Double-Edge PWM Modulators

Cited by 7 publications

References 20 publications

Volterra Models for Digital PWM and Their Inverses

Volterra Models for Digital PWM and Their Inverses

Universal microprocessor controlled power regulator with and without additional power supply

Spectral Analysis of UPWM Signals for Filterless Digital Class D Power Amplifiers

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