world congress on sustainable technologies, Nov 1, 2012
ABSTRACT In this first part of the paper, the architecture of the Hybrid Power Source based on Ma... more ABSTRACT In this first part of the paper, the architecture of the Hybrid Power Source based on Maximum Power Point tracking controller to harvest the energy available from used Renewable Energy Sources is presented. Usually, the energy harvesting is based on Extremum Seeking Control (ESC) loop. Two ESC schemes are proposed and analyzed in relation with the classical ESC schemes: (1) the modified ESC scheme (named mESC scheme because is based on band-pass filter BPF use, instead of series connection of the high-pass and low-pass filters such as used in higher order ESC scheme) and (2) its equivalent representation (named EQmESC because is based on modified higher order ESC scheme). The cut-off frequency of low-pass filter is chosen larger than in higher order ESC schemes in both ESC schemes proposed. This improves the dither persistence on the proposed ESC schemes, so the search speed of the extremum increases accordingly.
2021 13th International Conference on Electronics, Computers and Artificial Intelligence (ECAI)
In this paper we present the design of an electronic circuit which implements a differential meas... more In this paper we present the design of an electronic circuit which implements a differential measurement technique for detecting the presence of an explosive substance by using resonant sensors. Two TF-BAR sensors, with resonance frequencies of about 2 GHz, are employed for this purpose: an active one, which is exposed to the target substance and whose mass changes due to the molecules of that substance attaching to it, and a reference one, which is not exposed to the target substance and whose mass does not change. Due to the mass modification, the resonance frequency of the active sensor slightly changes. The purpose of the presented circuit is to measure this tiny frequency deviation by comparing the resonance frequencies of the two sensors. If both sensors are operated at the same temperature and humidity conditions, the measured frequency deviation is proportional with the amount of mass attached to the active sensor. In the proposed design, we use a frequency-to-voltage converter to translate this frequency deviation into a useful output signal. We present hereinafter the development of the electrical schematics and the simulations results of the functional blocks for the proposed measuring circuit.
Sep2013-pp133-141.pdf c2). Papers in Journals indexed +B & B (by CNCSIS-National Council of Scien... more Sep2013-pp133-141.pdf c2). Papers in Journals indexed +B & B (by CNCSIS-National Council of Scientific Research in Higher Education) 1
In this paper we are concerned on coplanar waveguide (CPW) resonator design for X band antenna ap... more In this paper we are concerned on coplanar waveguide (CPW) resonator design for X band antenna applications. The CPW technology can be considered as an good altenative to microstrip due to uniplanar presence of both signal and ground planes, thus offering high possibility of integrating active components. SOME ASPECTS CONCERNING THE DESIGN OF A DIGITAL ELECTRONIC TACHOGRAPH Gheorghe ĹžERBAN, Gabriel IANA, LaurenĹŁiu IONESCU, Alin MAZARE University of PiteĹźti Targu din Vale St. Nr.1, PiteĹźti 110040, ROMANIA [email protected], [email protected], [email protected], [email protected] Abstract: This paper presents a project meant to design and realize a digital electronic tachograph intended for transport vehicles. This project was the object of the scientific research contract 8C1/2004 AMTRANS financed by the Romanian Ministry of Education. The paper presents some aspects of the hardware design of the system, the software and security solutions for data transfer between central system and the m...
2019 11th International Conference on Electronics, Computers and Artificial Intelligence (ECAI), 2019
In this paper is presented a simple method to extract the parameters of a photovoltaic (PV) cell ... more In this paper is presented a simple method to extract the parameters of a photovoltaic (PV) cell model using a single current-voltage curve. The experimental results for current-voltage curve are obtained from the constant illumination level of the PV cell. The used model of PV cell is the single-diode model and contained five parameters: $\mathbf{I}_{\mathbf{ph}}$ – the current generated by light in PV cell, $\mathbf{I}_{\mathbf{0}}$ – the dark saturation current of the diode, n – the ideality factor of the diode, $\mathbf{R}_{\mathbf{s}}$ – the series resistance, and $\mathbf{R}_{\mathbf{sh}}$ – the shunt resistance. The proposed method has been applied for a monocrystalline Si 6 inch PV cell. In order to validate the proposed models, the parameters were used in the Spice simulation.
Analysis, Control and Optimal Operations in Hybrid Power Systems, 2013
This chapter analyses the control of the Hybrid Power Sources (HPS) based on some applications pe... more This chapter analyses the control of the Hybrid Power Sources (HPS) based on some applications performed. Usually, a HPS combines two or more energy sources that work together with the Energy Storage Devices (ESD) to deliver power continuously to the DC load or to the AC load via the inverter system. In the automotive applications, the ESD stack can be charged from the regenerative braking power flow or from other power sources like the thermoelectric generator or the renewable source. The last may have a daily variable power flow such as the photovoltaic panels integrated into a car’s body or into buildings. In the first section, an efficient fuel cell/battery HPS topology is proposed for high power applications to obtain both performances in energy conversion efficiency and fuel cell ripple mitigation. This topology uses an inverter system directly powered from the appropriate Polymer Electrolyte Membrane Fuel Cell (PEMFC) stack that is the main power source and a buck Controlled Current Source (buck CCS) supplied by a batteries stack, which is the low power auxiliary source. The buck CCS is connected in parallel with the main power source, the PEMFC stack. Usually, the FC HPS supply inverter systems and PMFC current ripple normally appear in operation of the inverter system that is grid connected or supply the AC motors in vehicle applications. The Low Frequency (LF) ripple mitigation is based on the active nonlinear control placed in the tracking control loop of the fuel cell current ripple shape. So the buck CCS will generate an anti-ripple current that tracks the FC current shape. This anti-ripple current is injected into the output node of the HPS to mitigate the inverter current ripple. Consequently, the buck CCS must be designed in order to assure the dynamic requested in the control loop. The ripple mitigation performances are evaluated by some indicators related to the LF harmonics mitigation. It is shown that good performances are also obtained with the hysteretic current—mode control, but the nonlinear control has better performances. The nonlinear control of the buck CCS is implemented based on a piecewise linear control law. This control law is simply designed based on the inverse gain that is computed to give a constant answer for all levels of the LF current ripple. The control performances are shown by the simulations performed. Finally, the designed control law will be validated using a Fuzzy Logic Controller (FLC). In the second and the third section is proposed and analysed a nonlinear control for FC HPS based on bi-buck topology that further improves FC performance and its durability in use in the low and medium power applications. The nonlinear voltage control is analysed and designed in the second section using a systematic approach. The design goal is to stabilise the HPS output voltage. This voltage must have a low voltage ripple. Additionally, the power spectrum of this ripple must be spread in a wide frequencies band using an anti-chaos control. All the results have been validated with several simulations.
In this first part of the paper, the architecture of the Hybrid Power Source based on Maximum Pow... more In this first part of the paper, the architecture of the Hybrid Power Source based on Maximum Power Point tracking controller to harvest the energy available from used Renewable Energy Sources is presented. Usually, the energy harvesting is based on Extremum Seeking Control (ESC) loop. Two ESC schemes are proposed and analyzed in relation with the classical ESC schemes: (1) the modified ESC scheme (named mESC scheme because is based on band-pass filter BPF use, instead of series connection of the high-pass and low-pass filters such as used in higher order ESC scheme) and (2) its equivalent representation (named EQmESC because is based on modified higher order ESC scheme). The cut-off frequency of low-pass filter is chosen larger than in higher order ESC schemes in both ESC schemes proposed. This improves the dither persistence on the proposed ESC schemes, so the search speed of the extremum increases accordingly.
In this paper we present an experimental set-up for measuring small frequency differences between... more In this paper we present an experimental set-up for measuring small frequency differences between two RF oscillators [1] by using a homodyne detection scheme [2]. To emulate the oscillators, we used two RF sources whose output signals were mixed and then the low frequency components at the mixer's output was measured with a network frequency analyzer. The purpose of these experiments was to evaluate a possible method to discriminate the resonance frequency change of a TF-BAR sensor as a response to its contamination with certain substances.
In this paper the study about micro-inverter is proposed, based on the three Maximum Power Point ... more In this paper the study about micro-inverter is proposed, based on the three Maximum Power Point Tracking (MPPT) technique for photovoltaic (PV) system: Perturb and Observe algorithm (P&O), advanced Extremum Seeking (aES), modified Extremum Seeking (mES) controls. The study is made with the dynamic standard test EN 50530 which uses various test sequences. The simulation results allow the comparison of MPPT efficiency for the three algorithms that have been tested. The dynamic performance is tested for three levels of frequency: low, medium and high frequency. MPP efficiency at low frequency is 97%, for advanced Extremum Seeking Control (aESC). MPP efficiency descends to 96% for modified Extremum Seeking Control (mESC) and 94% for P&O algorithm.
In the past years we have experienced a fast growth in the demand and widespread of mobile device... more In the past years we have experienced a fast growth in the demand and widespread of mobile devices. The evolution of wireless network technologies has offered mobile devices direct access to Internet and so, now, many applications allow users to interact with their friends on social-networks, send emails, use internet- banking services and more, while on the move. Because of that, and the advance in hardware capabilities, end users are increasingly relying on their personal mobile devices to store and handle sensitive information. In such context the privacy issues are quite concerning, since is likely for vendors to access sensitive data through their custom apps. Although several studies have examined general privacy risks and solutions to monitor, block or shadow personal data, few attempts have been made to build a framework that profiles the privacy impact of Android mobile applications at installation time and afterwards. Hence, in this paper, we propose an Android system exte...
A real-time optimization (RTO) strategy for Fuel Cell Hybrid Power Sources (FCHPS) based on the c... more A real-time optimization (RTO) strategy for Fuel Cell Hybrid Power Sources (FCHPS) based on the control of the boost converter is proposed in this study. The reference current for boost controller is generated by the optimization strategy based on the Global Extremum Seeking (GES) scheme. The GES scheme will track the maximum value of the optimization function considered for the FC system. The second input of the boost controller is the FC current. Because the fuel flow rate is controlled by the FC current, the optimization loop is closed via the fuel flow rate. The Load-Following (LF) control is used for the air flow rate to adjust the FC power to variable load demand. The performance of the proposed Boost_GES-RTO strategy is shown in comparison with the sFF-RTO strategy for constant and variable load based on the following performance indicators: the FC net power (PFCnet), the fuel consumption efficiency (Fueleff), the FC system efficiency (ηsys), and Total Fuel consumption (FuelT).
trol performances are shown by the simulations performed. Finally, the designed control law will ... more trol performances are shown by the simulations performed. Finally, the designed control law will be validated using a Fuzzy Logic Controller (FLC). In the second and the third section is proposed and analyzed a nonlinear control for FC HPS based on bi-buck topology that further improves FC performance and its durability in use in the low and medium power applications. The nonlinear voltage control is analyzed and designed in the second section using a systematic approach. The design goal is to stabilize the HPS output voltage. This voltage must have a low voltage ripple. Additionally, the power spectrum of this ripple must be spread in a wide frequencies band using an anti-chaos control. All the results have been validated with several simulations.
World Congress on Sustainable Technologies (WCST-2012), 2012
Comparison of Various Pretreatments of Wheat Straw for Biomethanation (Meena Krishania, Virendra ... more Comparison of Various Pretreatments of Wheat Straw for Biomethanation (Meena Krishania, Virendra Kumar Vijay) A Biophysical Evaluation of a MSW-to-energy System (C.MVB.Almeida, S.H. Bonilla, B.F. Giannetti, G. S. Frimaio, C.C. da Silva) An empirical study to investigate Oral health problems in Egypt The Case of Alexandria University (Hania EL Shoubashy, Rasha Abd EL Aziz) Recent trends in E-waste research: A bibliometric map approach (Filippo Corsini, Marco Frey, Francesco Rizzi) Time Aspect of Information Stored On Windows Application Memory (Funminiyi Olajide, Richard Trafford, Galyna Akmayeva, Charles Shoniregun) On the Dither Persistence in the Extremum Seeking control Part I: ESC loop based on Band-Pass Filter (Nicu Bizon, Mihai Oproescu, Marian Raducu) On the Dither Persistence in the Extremum Seeking control Part II: Signal harmonics' persistence for large filtering pass band (Nicu Bizon, Mihai Oproescu, Marian Raducu)
ABSTRACT In this paper is presented a high-frequency link inverter, which has a thiristors output... more ABSTRACT In this paper is presented a high-frequency link inverter, which has a thiristors output bridge and a low input voltage. The high-frequency ac link conversion lets reduced the number of power stages. The gate pulses are generated using multiple-carrier methods by adapting pulse-width modulation (PWM) technique. Thus, the advanced and delay gate pulses are generated in a form which provides gating signals compatible for isolated gate drives . The PSpice simulation results are obtained for a low-voltage ac link inverter. The experimental gate pulses generated are presented for 500 Hz ac link.
world congress on sustainable technologies, Nov 1, 2012
ABSTRACT In this first part of the paper, the architecture of the Hybrid Power Source based on Ma... more ABSTRACT In this first part of the paper, the architecture of the Hybrid Power Source based on Maximum Power Point tracking controller to harvest the energy available from used Renewable Energy Sources is presented. Usually, the energy harvesting is based on Extremum Seeking Control (ESC) loop. Two ESC schemes are proposed and analyzed in relation with the classical ESC schemes: (1) the modified ESC scheme (named mESC scheme because is based on band-pass filter BPF use, instead of series connection of the high-pass and low-pass filters such as used in higher order ESC scheme) and (2) its equivalent representation (named EQmESC because is based on modified higher order ESC scheme). The cut-off frequency of low-pass filter is chosen larger than in higher order ESC schemes in both ESC schemes proposed. This improves the dither persistence on the proposed ESC schemes, so the search speed of the extremum increases accordingly.
2021 13th International Conference on Electronics, Computers and Artificial Intelligence (ECAI)
In this paper we present the design of an electronic circuit which implements a differential meas... more In this paper we present the design of an electronic circuit which implements a differential measurement technique for detecting the presence of an explosive substance by using resonant sensors. Two TF-BAR sensors, with resonance frequencies of about 2 GHz, are employed for this purpose: an active one, which is exposed to the target substance and whose mass changes due to the molecules of that substance attaching to it, and a reference one, which is not exposed to the target substance and whose mass does not change. Due to the mass modification, the resonance frequency of the active sensor slightly changes. The purpose of the presented circuit is to measure this tiny frequency deviation by comparing the resonance frequencies of the two sensors. If both sensors are operated at the same temperature and humidity conditions, the measured frequency deviation is proportional with the amount of mass attached to the active sensor. In the proposed design, we use a frequency-to-voltage converter to translate this frequency deviation into a useful output signal. We present hereinafter the development of the electrical schematics and the simulations results of the functional blocks for the proposed measuring circuit.
Sep2013-pp133-141.pdf c2). Papers in Journals indexed +B & B (by CNCSIS-National Council of Scien... more Sep2013-pp133-141.pdf c2). Papers in Journals indexed +B & B (by CNCSIS-National Council of Scientific Research in Higher Education) 1
In this paper we are concerned on coplanar waveguide (CPW) resonator design for X band antenna ap... more In this paper we are concerned on coplanar waveguide (CPW) resonator design for X band antenna applications. The CPW technology can be considered as an good altenative to microstrip due to uniplanar presence of both signal and ground planes, thus offering high possibility of integrating active components. SOME ASPECTS CONCERNING THE DESIGN OF A DIGITAL ELECTRONIC TACHOGRAPH Gheorghe ĹžERBAN, Gabriel IANA, LaurenĹŁiu IONESCU, Alin MAZARE University of PiteĹźti Targu din Vale St. Nr.1, PiteĹźti 110040, ROMANIA [email protected], [email protected], [email protected], [email protected] Abstract: This paper presents a project meant to design and realize a digital electronic tachograph intended for transport vehicles. This project was the object of the scientific research contract 8C1/2004 AMTRANS financed by the Romanian Ministry of Education. The paper presents some aspects of the hardware design of the system, the software and security solutions for data transfer between central system and the m...
2019 11th International Conference on Electronics, Computers and Artificial Intelligence (ECAI), 2019
In this paper is presented a simple method to extract the parameters of a photovoltaic (PV) cell ... more In this paper is presented a simple method to extract the parameters of a photovoltaic (PV) cell model using a single current-voltage curve. The experimental results for current-voltage curve are obtained from the constant illumination level of the PV cell. The used model of PV cell is the single-diode model and contained five parameters: $\mathbf{I}_{\mathbf{ph}}$ – the current generated by light in PV cell, $\mathbf{I}_{\mathbf{0}}$ – the dark saturation current of the diode, n – the ideality factor of the diode, $\mathbf{R}_{\mathbf{s}}$ – the series resistance, and $\mathbf{R}_{\mathbf{sh}}$ – the shunt resistance. The proposed method has been applied for a monocrystalline Si 6 inch PV cell. In order to validate the proposed models, the parameters were used in the Spice simulation.
Analysis, Control and Optimal Operations in Hybrid Power Systems, 2013
This chapter analyses the control of the Hybrid Power Sources (HPS) based on some applications pe... more This chapter analyses the control of the Hybrid Power Sources (HPS) based on some applications performed. Usually, a HPS combines two or more energy sources that work together with the Energy Storage Devices (ESD) to deliver power continuously to the DC load or to the AC load via the inverter system. In the automotive applications, the ESD stack can be charged from the regenerative braking power flow or from other power sources like the thermoelectric generator or the renewable source. The last may have a daily variable power flow such as the photovoltaic panels integrated into a car’s body or into buildings. In the first section, an efficient fuel cell/battery HPS topology is proposed for high power applications to obtain both performances in energy conversion efficiency and fuel cell ripple mitigation. This topology uses an inverter system directly powered from the appropriate Polymer Electrolyte Membrane Fuel Cell (PEMFC) stack that is the main power source and a buck Controlled Current Source (buck CCS) supplied by a batteries stack, which is the low power auxiliary source. The buck CCS is connected in parallel with the main power source, the PEMFC stack. Usually, the FC HPS supply inverter systems and PMFC current ripple normally appear in operation of the inverter system that is grid connected or supply the AC motors in vehicle applications. The Low Frequency (LF) ripple mitigation is based on the active nonlinear control placed in the tracking control loop of the fuel cell current ripple shape. So the buck CCS will generate an anti-ripple current that tracks the FC current shape. This anti-ripple current is injected into the output node of the HPS to mitigate the inverter current ripple. Consequently, the buck CCS must be designed in order to assure the dynamic requested in the control loop. The ripple mitigation performances are evaluated by some indicators related to the LF harmonics mitigation. It is shown that good performances are also obtained with the hysteretic current—mode control, but the nonlinear control has better performances. The nonlinear control of the buck CCS is implemented based on a piecewise linear control law. This control law is simply designed based on the inverse gain that is computed to give a constant answer for all levels of the LF current ripple. The control performances are shown by the simulations performed. Finally, the designed control law will be validated using a Fuzzy Logic Controller (FLC). In the second and the third section is proposed and analysed a nonlinear control for FC HPS based on bi-buck topology that further improves FC performance and its durability in use in the low and medium power applications. The nonlinear voltage control is analysed and designed in the second section using a systematic approach. The design goal is to stabilise the HPS output voltage. This voltage must have a low voltage ripple. Additionally, the power spectrum of this ripple must be spread in a wide frequencies band using an anti-chaos control. All the results have been validated with several simulations.
In this first part of the paper, the architecture of the Hybrid Power Source based on Maximum Pow... more In this first part of the paper, the architecture of the Hybrid Power Source based on Maximum Power Point tracking controller to harvest the energy available from used Renewable Energy Sources is presented. Usually, the energy harvesting is based on Extremum Seeking Control (ESC) loop. Two ESC schemes are proposed and analyzed in relation with the classical ESC schemes: (1) the modified ESC scheme (named mESC scheme because is based on band-pass filter BPF use, instead of series connection of the high-pass and low-pass filters such as used in higher order ESC scheme) and (2) its equivalent representation (named EQmESC because is based on modified higher order ESC scheme). The cut-off frequency of low-pass filter is chosen larger than in higher order ESC schemes in both ESC schemes proposed. This improves the dither persistence on the proposed ESC schemes, so the search speed of the extremum increases accordingly.
In this paper we present an experimental set-up for measuring small frequency differences between... more In this paper we present an experimental set-up for measuring small frequency differences between two RF oscillators [1] by using a homodyne detection scheme [2]. To emulate the oscillators, we used two RF sources whose output signals were mixed and then the low frequency components at the mixer's output was measured with a network frequency analyzer. The purpose of these experiments was to evaluate a possible method to discriminate the resonance frequency change of a TF-BAR sensor as a response to its contamination with certain substances.
In this paper the study about micro-inverter is proposed, based on the three Maximum Power Point ... more In this paper the study about micro-inverter is proposed, based on the three Maximum Power Point Tracking (MPPT) technique for photovoltaic (PV) system: Perturb and Observe algorithm (P&O), advanced Extremum Seeking (aES), modified Extremum Seeking (mES) controls. The study is made with the dynamic standard test EN 50530 which uses various test sequences. The simulation results allow the comparison of MPPT efficiency for the three algorithms that have been tested. The dynamic performance is tested for three levels of frequency: low, medium and high frequency. MPP efficiency at low frequency is 97%, for advanced Extremum Seeking Control (aESC). MPP efficiency descends to 96% for modified Extremum Seeking Control (mESC) and 94% for P&O algorithm.
In the past years we have experienced a fast growth in the demand and widespread of mobile device... more In the past years we have experienced a fast growth in the demand and widespread of mobile devices. The evolution of wireless network technologies has offered mobile devices direct access to Internet and so, now, many applications allow users to interact with their friends on social-networks, send emails, use internet- banking services and more, while on the move. Because of that, and the advance in hardware capabilities, end users are increasingly relying on their personal mobile devices to store and handle sensitive information. In such context the privacy issues are quite concerning, since is likely for vendors to access sensitive data through their custom apps. Although several studies have examined general privacy risks and solutions to monitor, block or shadow personal data, few attempts have been made to build a framework that profiles the privacy impact of Android mobile applications at installation time and afterwards. Hence, in this paper, we propose an Android system exte...
A real-time optimization (RTO) strategy for Fuel Cell Hybrid Power Sources (FCHPS) based on the c... more A real-time optimization (RTO) strategy for Fuel Cell Hybrid Power Sources (FCHPS) based on the control of the boost converter is proposed in this study. The reference current for boost controller is generated by the optimization strategy based on the Global Extremum Seeking (GES) scheme. The GES scheme will track the maximum value of the optimization function considered for the FC system. The second input of the boost controller is the FC current. Because the fuel flow rate is controlled by the FC current, the optimization loop is closed via the fuel flow rate. The Load-Following (LF) control is used for the air flow rate to adjust the FC power to variable load demand. The performance of the proposed Boost_GES-RTO strategy is shown in comparison with the sFF-RTO strategy for constant and variable load based on the following performance indicators: the FC net power (PFCnet), the fuel consumption efficiency (Fueleff), the FC system efficiency (ηsys), and Total Fuel consumption (FuelT).
trol performances are shown by the simulations performed. Finally, the designed control law will ... more trol performances are shown by the simulations performed. Finally, the designed control law will be validated using a Fuzzy Logic Controller (FLC). In the second and the third section is proposed and analyzed a nonlinear control for FC HPS based on bi-buck topology that further improves FC performance and its durability in use in the low and medium power applications. The nonlinear voltage control is analyzed and designed in the second section using a systematic approach. The design goal is to stabilize the HPS output voltage. This voltage must have a low voltage ripple. Additionally, the power spectrum of this ripple must be spread in a wide frequencies band using an anti-chaos control. All the results have been validated with several simulations.
World Congress on Sustainable Technologies (WCST-2012), 2012
Comparison of Various Pretreatments of Wheat Straw for Biomethanation (Meena Krishania, Virendra ... more Comparison of Various Pretreatments of Wheat Straw for Biomethanation (Meena Krishania, Virendra Kumar Vijay) A Biophysical Evaluation of a MSW-to-energy System (C.MVB.Almeida, S.H. Bonilla, B.F. Giannetti, G. S. Frimaio, C.C. da Silva) An empirical study to investigate Oral health problems in Egypt The Case of Alexandria University (Hania EL Shoubashy, Rasha Abd EL Aziz) Recent trends in E-waste research: A bibliometric map approach (Filippo Corsini, Marco Frey, Francesco Rizzi) Time Aspect of Information Stored On Windows Application Memory (Funminiyi Olajide, Richard Trafford, Galyna Akmayeva, Charles Shoniregun) On the Dither Persistence in the Extremum Seeking control Part I: ESC loop based on Band-Pass Filter (Nicu Bizon, Mihai Oproescu, Marian Raducu) On the Dither Persistence in the Extremum Seeking control Part II: Signal harmonics' persistence for large filtering pass band (Nicu Bizon, Mihai Oproescu, Marian Raducu)
ABSTRACT In this paper is presented a high-frequency link inverter, which has a thiristors output... more ABSTRACT In this paper is presented a high-frequency link inverter, which has a thiristors output bridge and a low input voltage. The high-frequency ac link conversion lets reduced the number of power stages. The gate pulses are generated using multiple-carrier methods by adapting pulse-width modulation (PWM) technique. Thus, the advanced and delay gate pulses are generated in a form which provides gating signals compatible for isolated gate drives . The PSpice simulation results are obtained for a low-voltage ac link inverter. The experimental gate pulses generated are presented for 500 Hz ac link.
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Papers by Marian Raducu