Power distribution in pulse-density modulated waveforms

Calleja, Hugo; Pacheco, J.

doi:10.1109/pesc.2000.880522

Cited by 9 publications

(4 citation statements)

References 4 publications

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“…The same density D can be achieved under different combinations of (k; m; n). Therefore, it is advisable to choose the combination of (k; m; n) providing the fewer free-wheeling interval and amplitude fluctuation of i O [17], [25], [27]. In order to ensure a more uniform control characteristic, it is expedient to combine nearby combinations (k; m; n) to obtain additional characteristic points, and some of them can be excluded.…”

Section: Figure 3 Waveforms Of υ O In Case Of Different Pdm Techniquesmentioning

confidence: 99%

“…Under low quality factor Q of the seriesresonant circuit, it can be a significant problem. The authors of [16]- [18], [20], [25]- [27] deal with ways to reduce the current amplitude fluctuation by improving control methods on the basis of traditional PDM. Another disadvantage of PDM using is that at a frequency much higher than the resonant frequency of the series-resonant circuit it is possible to get NON-ZVS commutation modes, especially during the start-up process.…”

Section: Introductionmentioning

confidence: 99%

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Soft start-up strategy of pulse-density-modulated series-resonant converter for induction heating application

Herasymenko

Pavlovskyi

2021

IJPEDS

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This paper presents a soft start-up strategy of pulse-density-modulated series-resonant converter for induction heating application. The pulse-density modulation (PDM) technique is widely used in converters based on voltage-source series-resonant inverters (SRIs) to control the output current or power. However, during a start-up process, PDM has some disadvantages both in inrush current limiting and providing a zero-voltage switching operation of SRI transistors. In the paper, different PDM techniques are considered and basic moments of PDM using within the start-up process are analyzed. A new soft start-up strategy of PDM converter for induction heating application is proposed. The main features of the proposed strategy include an interleaved or a stepped PDM control, an initial combination of PDM at the beginning of the start-up process, and an operating algorithm during the start-up process. The proposed strategy was verified by a 2.5 kW experimental setup of the pulse-density-modulated interleaved converter with an operating frequency from 50 kHz up to 100 kHz. Experimental results confirm the effectiveness of the proposed start-up strategy and show that the maximum current amplitude within start-up processes exceeds the maximum steady-state current amplitude by no more than 30%.

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Section: Figure 3 Waveforms Of υ O In Case Of Different Pdm Techniquesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Soft start-up strategy of pulse-density-modulated series-resonant converter for induction heating application

Herasymenko

Pavlovskyi

2021

IJPEDS

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“…Harmonics can also be a source of power loss in the system. As discussed in [9], the power distribution in pulse-density modulated waveforms is a function of modulation depth (pulse density) and the quality factor of the output filter. For the example in fig.…”

Section: Introductionmentioning

confidence: 99%

“…For the example in fig. 2, with loaded quality factor of Q~12 and pulse-density of 50% (6dB power backoff), approximately 95% of the harmonic power is concentrated in the carrier [9]. This number ignores loss in active and passive components and falls off with decreasing pulse-density.…”

Section: Introductionmentioning

confidence: 99%

Pulse-density modulation for RF applications: The radio-frequency power amplifier (RF PA) as a power converter

Stauth

Sanders

2008

2008 IEEE Power Electronics Specialists Conference

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-Switching processes such as pulse-width and pulse-density modulation have been used for many years in power electronics applications. Due to rapid scaling of semiconductor technology, similar approaches may be successfully applied to blocks in the radio architecture. This work outlines the implementation of a class-D power amplifier for RF applications in low-GHz frequency bands. We describe the motivation for using pulse-density modulation (PDM) to achieve linear amplitude modulation of a nominally nonlinear switching power amplifier. The amplifier achieves linearity suitable for wideband wireless standards, with peak efficiency of 43.5% at 1.95GHz and up to 20dBm output power. The system generates amplitudemodulated waveforms with up to 20MHz envelope bandwidth, demonstrating the validity of this approach for modern communication standards. I.INTRODUCTION After decades of successful process and technology scaling, active semiconductor devices are now operating with current and power gain-bandwidths (f t and f max ) in excess of 100GHz [1][2]. This enables efficient operation of deep-submicron CMOS technology at radio frequencies with conventional analog and digital circuitry. In modern digital CMOS technologies, core libraries of standard cells can operate at low-GHz carrier frequencies. Combined with extraction of layout parasitics, standard-cell designflow allows direct and rapid synthesis of computational blocks at RF frequencies. This enables complex digital processing and control of RF switching waveforms.Trends in processing speed and circuit design methodology will have a direct impact on many blocks in wireless systems. As this work demonstrates, techniques previously used for audio amplifiers, motor control, and power conversion may now be relevant for RF applications. Here we present an RF power amplifier (RF PA) implemented as a power digital-analog converter (DAC). The class-D PA operates with both NMOS and PMOS complementary devices. With PMOS f t on the order of 40GHz in the 90nm process, switching power loss is substantially reduced compared to previous generations of CMOS technology. We implement digital control of the carrier amplitude using pulse-density modulation (PDM). Two stages of digital circuitry shape quantization noise away from the signal band. A High quality factor (Q) passive filter attenuates out-of-band noise, and reduces power loss from harmonics. Matching networks and filtering is implemented at the board level to achieve higher quality factor. With appropriate passive components, we achieve unloaded Q in the range of 20-30 in the output network [3].

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Power inverter control for induction heating by pulse density modulation with improved power factor

Essadaoui

Sicard

Ngandui

et al.

CCECE 2003 - Canadian Conference on Electrical and Computer Engineering. Toward a Caring and Humane Technology (Cat. No.03CH374

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Power distribution in pulse-density modulated waveforms

Cited by 9 publications

References 4 publications

Soft start-up strategy of pulse-density-modulated series-resonant converter for induction heating application

Soft start-up strategy of pulse-density-modulated series-resonant converter for induction heating application

Pulse-density modulation for RF applications: The radio-frequency power amplifier (RF PA) as a power converter

Power inverter control for induction heating by pulse density modulation with improved power factor

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