Compensation techniques for non-linearities in H-bridge inverters

Zammit, Daniel; Staines, Cyril Spiteri; Apap, M.

doi:10.1016/j.jesit.2016.07.007

Cited by 11 publications

(10 citation statements)

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“…The remaining difference to reach 100% is due to voltage drops on the switching devices and any discrepancies/variations in the load resistance. Other compensation techniques can be used to compensate for nonlinearities created by the voltage drops on the switching devices, as those presented in Zammit et al (2016).…”

Section: Discussionmentioning

confidence: 99%

Dead time compensation in H-bridge inverters

Zammit¹,

Apap²,

Staines³

2018

IJIED

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This paper presents the procedure to apply compensation for the distortion created by the dead time/blanking time in H-bridge inverters, as those used in grid-connected photovoltaic (PV) inverters. It also deals with the selection of an appropriate value of dead time, by measuring the turn-on and turn-off times of the switching devices. Dead time/blanking time is needed in H-bridge inverters to prevent 'shoot through' or cross-conduction current through the inverter leg due to the non-ideal nature of the switching devices. The distortion effect of the dead time is analysed by practical experimentation, showing the importance of selecting the most appropriate value of dead time. This is then followed by a procedure to apply compensation to decrease the distortion and thus decrease harmonics caused by the dead time. Both simulation and experimental results will be presented. Testing was carried out on a grid-connected PV inverter which was designed and constructed for this research. . His current research interests are related to design and control of electrical machines, power electronic converters, micro-grids, energy efficiency and renewable energy sources (RES).

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Section: Discussionmentioning

confidence: 99%

Dead time compensation in H-bridge inverters

Zammit¹,

Apap²,

Staines³

2018

IJIED

Self Cite

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“…where t s is the specific application time interval fixed by the space vector modulation strategy. From (11) the capacitance value of C f can be calculated. This design approach takes into account the behaviour of the current and voltage ripple shapes in the case of symmetrical space vector modulation.…”

Section: Input Current and Voltage Ripple Issuesmentioning

confidence: 99%

“…The waveforms distortion caused by dead time is affected by its length, given the switching frequency and the input DC voltage. The reduction of dead time enabled by advanced GaN FETs as a switching solution improves the shape of the waveforms without the use of dedicated software resources to compensate for the waveform distortion drawbacks [11].…”

Section: Introductionmentioning

confidence: 99%

Low-Voltage GaN FETs in Motor Control Application; Issues and Advantages: A Review

et al. 2021

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The efficiency and power density improvement of power switching converters play a crucial role in energy conversion. In the field of motor control, this requires an increase in the converter switching frequency together with a reduction in the switching legs’ dead time. This target turns out to be complex when using pure silicon switch technologies. Gallium Nitride (GaN) devices have appeared in the switching device arena in recent years and feature much more favorable static and dynamic characteristics compared to pure silicon devices. In the field of motion control, there is a growing use of GaN devices, especially in low voltage applications. This paper provides guidelines for designers on the optimal use of GaN FETs in motor control applications, identifying the advantages and discussing the main issues. In this work, primarily an experimental evaluation of GaN FETs in a low voltage electrical drive is carried out. The experimental investigation is obtained through two different experimental boards to highlight the switching legs’ behavior in several operative conditions and different implementations. In this evaluative approach, the main GaN FETs’ technological aspects and issues are recalled and consequently linked to motion control requirements. The device’s fast switching transients combined with reduced direct resistance contribute to decreased power losses. Thus, in GaN FETs, a high switching frequency with a strong decrease in dead time is achievable. The reduced dead time impact on power loss management and improvement of output waveforms quality is analyzed and discussed in this paper. Furthermore, input filter capacitor design matters correlated with increasing switching frequency are pointed out. Finally, the voltage transients slope effect (dv/dt) is considered and correlated with low voltage motor drives requirements.

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“…Those processes require a so called dead time or blanking time during which the signal to the gate of the switch is set to zero to reach the complete on or off condition. In other words the switching devices have finite turn-on and turn-off delays (Zammit et al, 2016). This is necessary because if we consider the leg of the halfbridge converter, as in this paper, if one switch has not yet completed the turn-off process and, at the same time, the other switch is turned-on then a shoot-through failure (short-circuit current through the leg) can happen damaging the converter (De Doncker et al, 2010).…”

Section: Previous Workmentioning

confidence: 99%

“…This is necessary because if we consider the leg of the halfbridge converter, as in this paper, if one switch has not yet completed the turn-off process and, at the same time, the other switch is turned-on then a shoot-through failure (short-circuit current through the leg) can happen damaging the converter (De Doncker et al, 2010). The dead time introduces a non-linearity which causes distortion in the output voltage and current (Zammit et al, 2016). Another example of half bridge converter implementation using Modelica is given in (Winter et al, 2015) where a DC/DC converter, extensively used in the automotive industry, is considered.…”

Section: Previous Workmentioning

confidence: 99%

Object Oriented Modeling and Control Design for PowerElectronics Half-Bridge Converter using Modelica

Laera¹,

Vanfretti²,

Thomas³

et al. 2020

Linköping Electronic Conference Proceedings

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In this paper the focus is on a particular type of converters that is the two-level VSC (DC/AC Voltage Source Converter). In this category the averaged model and the switching model of an half-bridge converter are considered. The half-bridge is a building block for multiphase and multilevel converters. The implementation of the two models of half-bridge converter using Modelica language is described with the structure of the package developed in Dymola. Different control strategies are introduced showing different behavior of the models in the simulations. The goals of this paper are several. First of all the modeling choice was to use Modelica for this type of work, that is traditionally carried out with domain specific tools, to show that it is possible to perform implementation and studies in the same field where traditional commercial softwares have been commonly and extensively used, with additional benefits that the language provides. In addition to that, this paper shows that the control design studies for an half-bridge converter, typically performed using averaged value models, can result in a set of control parameters values that are not successfully applicable to switching models of the same power electronic device.

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Compensation techniques for non-linearities in H-bridge inverters

Cited by 11 publications

References 1 publication

Dead time compensation in H-bridge inverters

Dead time compensation in H-bridge inverters

Low-Voltage GaN FETs in Motor Control Application; Issues and Advantages: A Review

Object Oriented Modeling and Control Design for PowerElectronics Half-Bridge Converter using Modelica

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