Improved FPGA-based dead time compensation for SVM inverters

Bolognani, Silverio; Ceschia, M.; Mattavelli, Paolo; Paccagnella, A.; Zigliotto, M.

doi:10.1049/cp:20040367

Cited by 19 publications

(7 citation statements)

References 15 publications

(13 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…it can also be understood that for continuous current waveforms having zero crossings, most of the volt-seconds lost during one switch -over (which happens during positive current) are gained back during the next switch-over (during negative output current) within the same switching period. This state of operation is taken in to account in some compensation methods, like in [4].…”

Section: Existing Compensation Methodsmentioning

confidence: 99%

Simple Model Based Dead Time Compensation Using Fast Current Measurement

Futo

Varjasi

2014

AASRI Procedia

View full text Add to dashboard Cite

Nowadays the increasing utilization of alternative energy sources demand three phase power converters capable of delivering high quality energy to the low voltage grid. Good dead time compensation hardware and software are essential to keep low order harmonics at acceptable levels even at light load conditions, at acceptable costs. Low current waveforms with multiple zero crossings within a switching period are still problematic with today's technology. Such operating conditions often happen in PWM inverters and in variable frequency drives at or below 10% load. This paper describes a new method which uses a model for calculating the voltage error caused by dead time for each phase leg. The method is completely software based, but requires fast current measurement. A model splits each half period of the triangular carrier to time segments where the slopes of the currents in all phases, and the output voltage of all semiconductor phase legs are constant. It determines the duration of each of the time segments, and integrates the volt-seconds for a half period of the triangular carrier. The model is capable of handling discontinuous conduction as well. The resulting error voltage can be used to calculate a new, compensated duty factor which can be applied to the PWM modulator. The described algorithm was tested via computer simulation. A comparison was made with other, previous methods using the same inverter model.

show abstract

Section: Existing Compensation Methodsmentioning

confidence: 99%

Simple Model Based Dead Time Compensation Using Fast Current Measurement

Futo

Varjasi

2014

AASRI Procedia

View full text Add to dashboard Cite

show abstract

“…The switching frequency component of each inductor voltage is determined by the potential difference between the bridge voltage of the phase (u bP ) and the neutral point (u N ). These have been plotted on Fig (5). The exact method also calculates with the changes of the base harmonic current within a switching period, and it has been tested with primitive dead time compensation algorithms in [10].…”

Section: Three Phase Signalsmentioning

confidence: 99%

Compensation of Discontinuous Conduction inThree Phase Grid Connected PWM Inverters

Futo¹,

Varjasi²

2014

REPQJ

View full text Add to dashboard Cite

Nowadays the increasing utilization of alternative energy sources demand power converters capable of delivering high quality energy to the low voltage grid. Good dead time compensation and linear operation are essential to keep low order harmonics at acceptable levels. High-current operating conditions are well handled by traditional methods, but low current behaviour and waveforms with multiple zero crossings within a switching period are problematic, especially at low load conditions at or below 10% load. Such conditions often occur in the battery chargers of electric cars. Power quality is also essential for sensorless drives, as the accuracy of the output voltage is very important especially at low rotational speeds. This paper describes the identified cases of discontinuous conduction during dead time. Based on the voltage and current waveforms of the three phase inverter, an improved dead time compensation method is shown for symmetric PWM controlled inverters. The compensator uses already available measurement data, and compensates the resulting error voltage at duty cycle level. The described method can be used for any type of three phase modulation. A similar approach can also be used for two phase modulations.

show abstract

“…The approaches proposed to mitigate the related effects were mostly intended to modify the reference signal either a priori [19] or on-the-line by detecting voltage zero crossing [20,21]. Effectiveness and complexity of the proposed techniques have been evolving in parallel with performance of digital systems [11,[22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Predictive dead time controller for GaN‐based boost converters

Schirone

Macellari

Pellitteri

2017

IET Power Electronics

View full text Add to dashboard Cite

A dynamic dead time controller is presented, specifically intended to operate in synchronous boost converters based on GaN field-effect transistor switches. These transistors have a reduced stored charge with respect to silicon metal-oxide-semiconductor field-effect transistors with similar breakdown voltage and series resistance, and can operate at higher frequencies with reduced switching losses. On the other hand, the voltage drop in reverse conduction is typically more than doubled with respect to silicon devices resulting in relevant power losses during the free-wheeling phases. Therefore, dynamic control of dead time can be profitably applied even in converters operating in the tens of volts range. The device presented in this study controls the switching delays taking into account both variations of the fall/rise times and of the turn-off/on delays, in order to keep dead time within a range of a few nanoseconds above its minimum value. A discrete-component prototype was designed, built in a synchronous boost converter and extensively tested at 1-2MHz switching frequency, in a range of operating parameters corresponding to significant variations of the switching times (currents in the 1-6A range, output voltage up to 50V). The prototype demonstrated the capability to match dead time to actual operating conditions with a smooth and fast transient response

show abstract

Improved FPGA-based dead time compensation for SVM inverters

Cited by 19 publications

References 15 publications

Simple Model Based Dead Time Compensation Using Fast Current Measurement

Simple Model Based Dead Time Compensation Using Fast Current Measurement

Compensation of Discontinuous Conduction inThree Phase Grid Connected PWM Inverters

Predictive dead time controller for GaN‐based boost converters

Contact Info

Product

Resources

About