Gerardo Ceglia | Universidad Simón Bolívar (original) (raw)
Papers by Gerardo Ceglia
International Journal of Electronics, 2008
Interest in multilevel inverters is increasing in recent years, especially in high voltage applic... more Interest in multilevel inverters is increasing in recent years, especially in high voltage applications. Traditional pulse width modulation (PWM) techniques can be applied to control this type of switched converter. However, it is necessary to adapt these techniques to the particularities of multilevel operation. As an alternative, other modulation techniques, such as sigma-delta modulation (SDM) can be used. In this case, it is possible to use advanced modulation techniques, such as adaptive modulation, to adapt the SDM to the multilevel operation. This article presents a new adaptive sigma-delta modulator that controls a five levels multilevel inverter. The algorithm that generates the sigma-delta signal is implemented in a field-programmable gate array (FPGA). This allows a very fast operation independent of the overall control circuit operation response. In addition, the FPGA can generate the control signals necessary to drive the power semiconductors in the power stage. The resulting modulator is simpler than the PWM version.
IEEE Transactions on Power Electronics, 2006
Multilevel converters offer high power capability, associated with lower output harmonics and low... more Multilevel converters offer high power capability, associated with lower output harmonics and lower commutation losses. Their main disadvantage is their complexity, requiring a great number of power devices and passive components, and a rather complex control circuitry. This work reports a new multilevel inverter topology using an H-bridge output stage with a bidirectional auxiliary switch. The new topology produces a significant reduction in the number of power devices and capacitors required to implement a multilevel output. The new topology is used in the design of a five-level inverter; only five controlled switches, eight diodes, and two capacitors are required to implement the five-level inverter using the proposed topology. The new topology achieves a 37.5% reduction in the number of main power switches required (five in the new against eight in any of the other three configurations) and uses no more diodes or capacitors that the second best topology in the literature, the Asymmetric Cascade configuration. Additionally, the dedicated modulator circuit required for multilevel inverter operation is implemented using a FPGA circuit, reducing overall system cost and complexity. Theoretical predictions are validated using simulation in SPICE, and satisfactory circuit operation is proved with experimental tests performed on a laboratory prototype. Index Terms-Capacitor clamped, diode clamped, field programmable gate array (FPGA), H-bridge, multilevel inverter.
Este trabajo presenta la configuracion "amortiguador de inductancia dividida y condensador c... more Este trabajo presenta la configuracion "amortiguador de inductancia dividida y condensador compartido" implementada para modulos de potencia de IGBTs en configuracion medio puente (half-bridge) inversor. Esta configuracion logra que el circuito principal opere en modo ZCS (encendido sin corriente inicial) durante la conmutacion de encendido y en modo ZVS (apagado con tension colector-emisor minima) durante la conmutacion de apagado, minimizando las perdidas por conmutacion en los dispositivos principales y aliviandolos del esfuerzo producido por los altos di/dt y dv/dt. El estudio teorico define los diversos modos de operacion en funcion de la corriente de carga; la operacion se modela en OrcadPspice. La validez del estudio teorico y de la simulacion se comprueba con resultados experimentales medidos en un prototipo. Se caracteriza la corriente circulante atrapada en las inductancias durante los ciclos de reposicion y se describe un mecanismo disipativo para eliminarla.
This paperpresents alowcost, high efficiency, powerelectronics training platform ofmodular archit... more This paperpresents alowcost, high efficiency, powerelectronics training platform ofmodular architecture foreducational purposes,based onthePICfamily ofmicrocontrollers. Itcanoperate both asa stand-alone system orconnected toastandard PC.Itisdesign tobeprogramed with Microchip freeware MPLAB.Theplatform supports laboratory work inthestudy ofthe powerstages andthestudy ofpower electronics controls inreal time.A digital light dimmer isdeveloped as oneintroductory application for thetraining platform.
This work presents the laboratory tests of a seven level H bridge with auxiliary switches configu... more This work presents the laboratory tests of a seven level H bridge with auxiliary switches configuration. The laboratory tests results agree with the simulations already presented, showing that the proposed configuration works as expected and that this new configuration may be of interest for applications working at lower and medium power levels.
Resumen: Este trabajo compara el comportamiento magnetico de tres transformadores de alta frecuen... more Resumen: Este trabajo compara el comportamiento magnetico de tres transformadores de alta frecuencia y alta potencia disenados para producir las mismas caracteristicas de salida, usando tres topologias diferentes en los arrollados del secundario y en el circuito magnetico, una convencional, que se usa como base de referencia, y dos de bobinado coaxial, una con nucleos E (“Transformador Coaxial Modelo EE”) y la otra con nucleos toroidales (“Transformador Coaxial Toroidal”). Los parametros basicos de los tres modelos se calculan con un metodo simplificado de diseno generico de transformadores. Una vez disenados los transformadores, se utiliza un programa de Elementos Finitos Magneticos para calcular los parametros mas importantes de cada diseno (densidad de campo, lineas de flujo, etc.) y se comparan los resultados obtenibles de las tres topologias, resultando evidente de la comparacion que la configuracion del Transformador Coaxial Toroidal es la que logra el mejor aprovechamiento de...
This work compares the magnetic behavior of three high frequency, high power transformers designe... more This work compares the magnetic behavior of three high frequency, high power transformers designed to produce the same output characteristics, using three different topologies in the secondary windings and the magnetic circuits, a conventional one, used as the reference, and two with coaxial windings, one with E-cores (“EE Model Coaxial Transformer”) and the other with toroidal cores (“Coaxial Toroidal Transformer”). The three models basic parameters are calculated with a generic simplified transformer design method. Once the transformers are designed, a Magnetic Finite Elements program is used to calculate each design main parameters (flux density, flux lines, etc), and the results obtained in the three topologies are compared, being evident that the Coaxial Toroidal Transformer is the one that achieves the best magnetic material use, keeping the best magnetic flux distribution and avoiding flux concentrations over the values allowed by the core material, that can cause over-heatin...
In this workthepractical results obtained with theSingleCapacitor SingleInductorActiveSnubber (SC... more In this workthepractical results obtained with theSingleCapacitor SingleInductorActiveSnubber (SCSIAS)circuit usingthe DiodeBridgeSwitch Configuration arepresented, proving theadvantages ofthis proposedtopology,whichcanbe implemented with minimumcomponentcount.The SCSIASconfiguration ensures thatthemainpowerdevices undergo a ZVS off- commutation and a ZCS on-commutation, minimizing commutation losses inalloperating conditions. Snubber topology alsoensures thatmostauxiliary commutations take place underzerovoltage/zero current conditions.
�Resumen-- Este trabajo presenta el diseno y construccion de un circuito de manejo de compuerta d... more �Resumen-- Este trabajo presenta el diseno y construccion de un circuito de manejo de compuerta de bajo costo y de propositos generales para dispositivos electronicos de potencia de compuerta aislada, tales como MOSFET e IGBT. Se ilustra en detalle la construccion de dicho circuito de manejo de compuerta y se presentan los resultados y formas de onda de las pruebas realizadas con un circuito troceador con IGBT controlado mediante el circuito de manejo de compuerta prototipo. Palabras clave: Circuito de disparo, circuito actuador, IGBT, MOSFET.
Universidad Ciencia Y Tecnologia, Mar 1, 2009
Revista de la Facultad de Ingenieria
This work presents the laboratory tests of a seven level H bridge with auxiliary switches configu... more This work presents the laboratory tests of a seven level H bridge with auxiliary switches configuration. The laboratory tests results agree with the simulations already presented, showing that the proposed configuration works as expected and that this new configuration may be of interest for applications working at lower and medium power levels.
2008 International Symposium on Power Electronics, Electrical Drives, Automation and Motion, 2008
This work presents the characterization of an automotive alternator for its use in electric gener... more This work presents the characterization of an automotive alternator for its use in electric generation related with alternative energies systems. A standard truck alternator (28V 100A) had been chosen to make the tests, which was carried out in a custom adaptor attached to a 6 KW DC motor bench. The alternator curves families were obtained varying the rotor speed between 5000 and 12500 RPM, with field voltages from 0 to 28 Volts. The tests show that it is possible to obtain output power well beyond the machine nominal rating, making it a useful alternative for power generation systems.
2007 European Conference on Power Electronics and Applications, 2007
ABSTRACT This work presents an improved Power Electronics Training Platform implemented with PIC ... more ABSTRACT This work presents an improved Power Electronics Training Platform implemented with PIC microcontrollers. The original training platform, presented in [7], has been improved transferring to a FPGA circuit the control of peripheral components such as LCD displays, keyboards, A/D and D/A converters, and I/O ports. This control transfer reduces the computational load in the PIC, enabling the PIC to perform the main tasks in a faster and more precise way. These enhancements increase the usefulness of the Training Platform as a low cost training tool in a Power Electronics Laboratory.
2005 European Conference on Power Electronics and Applications, 2005
... Gerardo Ceglia, Victor M. GuzmAn, Cesar A. Orellana, Juan M. Femnndez, Maria I. Gimenez, Juli... more ... Gerardo Ceglia, Victor M. GuzmAn, Cesar A. Orellana, Juan M. Femnndez, Maria I. Gimenez, Julio Walter. ... [5] S. Lentijo, A. Monti, E. Sandi, C. Welch, and R. Dougal, A New Testing Tool For Power Electronic Digital Control, PESC Conference 2003, Columbia (USA), 2003. ...
Advances in Induction and Microwave Heating of Mineral and Organic Materials, 2011
Proceedings of the Fifth IEEE International Caracas Conference on Devices, Circuits and Systems, 2004., 2004
Page 1. A New Multilevel Inverter Topology. 1Gerardo Ceglia ; 2Vicente Grau; 3Víctor Guzmán;4Carl... more Page 1. A New Multilevel Inverter Topology. 1Gerardo Ceglia ; 2Vicente Grau; 3Víctor Guzmán;4Carlos Sánchez; 5Fernando Ibáñez; 6Julio Walter; 7Antonio Millán; 8María I. Giménez 1,3,6,7,8 Universidad Simón Bolívar (Venezuela ...
2008 13th International Power Electronics and Motion Control Conference, 2008
At present multilevel converters are technically interesting due to their high power handling cap... more At present multilevel converters are technically interesting due to their high power handling capabilities, low output harmonics level and reduced requirements in blocking voltages in the switching devices ratings and lower commutation stresses and losses. The multilevel converter configurations now in use have as their main disadvantage their circuit complexity, requiring a great number of power devices and passive components
2008 7th International Caribbean Conference on Devices, Circuits and Systems, 2008
This paper presents a single capacitor active snubber circuit for the asymmetric inverters used t... more This paper presents a single capacitor active snubber circuit for the asymmetric inverters used to drive switched reluctance motors. The proposed configuration uses the motor coil inductance as an integral component in the snubber process, acting in sequence to ensure the low-loss commutation of each inverter main power device. The two auxiliary snubber switches naturally commutate in ZCS mode. Only
2007 European Conference on Power Electronics and Applications, 2007
Page 1. Control Model of a Closed Loop Power-Controlled Series-Type Resonant Induction Heating Sy... more Page 1. Control Model of a Closed Loop Power-Controlled Series-Type Resonant Induction Heating System Julio Walter, Gerardo Ceglia, Víctor Guzmán, Maria Giménez UNIVERSIDAD SIMÓN BOLÍVAR Sartenejas-Baruta 1081, Edo. ...
International Journal of Electronics, 2008
Interest in multilevel inverters is increasing in recent years, especially in high voltage applic... more Interest in multilevel inverters is increasing in recent years, especially in high voltage applications. Traditional pulse width modulation (PWM) techniques can be applied to control this type of switched converter. However, it is necessary to adapt these techniques to the particularities of multilevel operation. As an alternative, other modulation techniques, such as sigma-delta modulation (SDM) can be used. In this case, it is possible to use advanced modulation techniques, such as adaptive modulation, to adapt the SDM to the multilevel operation. This article presents a new adaptive sigma-delta modulator that controls a five levels multilevel inverter. The algorithm that generates the sigma-delta signal is implemented in a field-programmable gate array (FPGA). This allows a very fast operation independent of the overall control circuit operation response. In addition, the FPGA can generate the control signals necessary to drive the power semiconductors in the power stage. The resulting modulator is simpler than the PWM version.
IEEE Transactions on Power Electronics, 2006
Multilevel converters offer high power capability, associated with lower output harmonics and low... more Multilevel converters offer high power capability, associated with lower output harmonics and lower commutation losses. Their main disadvantage is their complexity, requiring a great number of power devices and passive components, and a rather complex control circuitry. This work reports a new multilevel inverter topology using an H-bridge output stage with a bidirectional auxiliary switch. The new topology produces a significant reduction in the number of power devices and capacitors required to implement a multilevel output. The new topology is used in the design of a five-level inverter; only five controlled switches, eight diodes, and two capacitors are required to implement the five-level inverter using the proposed topology. The new topology achieves a 37.5% reduction in the number of main power switches required (five in the new against eight in any of the other three configurations) and uses no more diodes or capacitors that the second best topology in the literature, the Asymmetric Cascade configuration. Additionally, the dedicated modulator circuit required for multilevel inverter operation is implemented using a FPGA circuit, reducing overall system cost and complexity. Theoretical predictions are validated using simulation in SPICE, and satisfactory circuit operation is proved with experimental tests performed on a laboratory prototype. Index Terms-Capacitor clamped, diode clamped, field programmable gate array (FPGA), H-bridge, multilevel inverter.
Este trabajo presenta la configuracion "amortiguador de inductancia dividida y condensador c... more Este trabajo presenta la configuracion "amortiguador de inductancia dividida y condensador compartido" implementada para modulos de potencia de IGBTs en configuracion medio puente (half-bridge) inversor. Esta configuracion logra que el circuito principal opere en modo ZCS (encendido sin corriente inicial) durante la conmutacion de encendido y en modo ZVS (apagado con tension colector-emisor minima) durante la conmutacion de apagado, minimizando las perdidas por conmutacion en los dispositivos principales y aliviandolos del esfuerzo producido por los altos di/dt y dv/dt. El estudio teorico define los diversos modos de operacion en funcion de la corriente de carga; la operacion se modela en OrcadPspice. La validez del estudio teorico y de la simulacion se comprueba con resultados experimentales medidos en un prototipo. Se caracteriza la corriente circulante atrapada en las inductancias durante los ciclos de reposicion y se describe un mecanismo disipativo para eliminarla.
This paperpresents alowcost, high efficiency, powerelectronics training platform ofmodular archit... more This paperpresents alowcost, high efficiency, powerelectronics training platform ofmodular architecture foreducational purposes,based onthePICfamily ofmicrocontrollers. Itcanoperate both asa stand-alone system orconnected toastandard PC.Itisdesign tobeprogramed with Microchip freeware MPLAB.Theplatform supports laboratory work inthestudy ofthe powerstages andthestudy ofpower electronics controls inreal time.A digital light dimmer isdeveloped as oneintroductory application for thetraining platform.
This work presents the laboratory tests of a seven level H bridge with auxiliary switches configu... more This work presents the laboratory tests of a seven level H bridge with auxiliary switches configuration. The laboratory tests results agree with the simulations already presented, showing that the proposed configuration works as expected and that this new configuration may be of interest for applications working at lower and medium power levels.
Resumen: Este trabajo compara el comportamiento magnetico de tres transformadores de alta frecuen... more Resumen: Este trabajo compara el comportamiento magnetico de tres transformadores de alta frecuencia y alta potencia disenados para producir las mismas caracteristicas de salida, usando tres topologias diferentes en los arrollados del secundario y en el circuito magnetico, una convencional, que se usa como base de referencia, y dos de bobinado coaxial, una con nucleos E (“Transformador Coaxial Modelo EE”) y la otra con nucleos toroidales (“Transformador Coaxial Toroidal”). Los parametros basicos de los tres modelos se calculan con un metodo simplificado de diseno generico de transformadores. Una vez disenados los transformadores, se utiliza un programa de Elementos Finitos Magneticos para calcular los parametros mas importantes de cada diseno (densidad de campo, lineas de flujo, etc.) y se comparan los resultados obtenibles de las tres topologias, resultando evidente de la comparacion que la configuracion del Transformador Coaxial Toroidal es la que logra el mejor aprovechamiento de...
This work compares the magnetic behavior of three high frequency, high power transformers designe... more This work compares the magnetic behavior of three high frequency, high power transformers designed to produce the same output characteristics, using three different topologies in the secondary windings and the magnetic circuits, a conventional one, used as the reference, and two with coaxial windings, one with E-cores (“EE Model Coaxial Transformer”) and the other with toroidal cores (“Coaxial Toroidal Transformer”). The three models basic parameters are calculated with a generic simplified transformer design method. Once the transformers are designed, a Magnetic Finite Elements program is used to calculate each design main parameters (flux density, flux lines, etc), and the results obtained in the three topologies are compared, being evident that the Coaxial Toroidal Transformer is the one that achieves the best magnetic material use, keeping the best magnetic flux distribution and avoiding flux concentrations over the values allowed by the core material, that can cause over-heatin...
In this workthepractical results obtained with theSingleCapacitor SingleInductorActiveSnubber (SC... more In this workthepractical results obtained with theSingleCapacitor SingleInductorActiveSnubber (SCSIAS)circuit usingthe DiodeBridgeSwitch Configuration arepresented, proving theadvantages ofthis proposedtopology,whichcanbe implemented with minimumcomponentcount.The SCSIASconfiguration ensures thatthemainpowerdevices undergo a ZVS off- commutation and a ZCS on-commutation, minimizing commutation losses inalloperating conditions. Snubber topology alsoensures thatmostauxiliary commutations take place underzerovoltage/zero current conditions.
�Resumen-- Este trabajo presenta el diseno y construccion de un circuito de manejo de compuerta d... more �Resumen-- Este trabajo presenta el diseno y construccion de un circuito de manejo de compuerta de bajo costo y de propositos generales para dispositivos electronicos de potencia de compuerta aislada, tales como MOSFET e IGBT. Se ilustra en detalle la construccion de dicho circuito de manejo de compuerta y se presentan los resultados y formas de onda de las pruebas realizadas con un circuito troceador con IGBT controlado mediante el circuito de manejo de compuerta prototipo. Palabras clave: Circuito de disparo, circuito actuador, IGBT, MOSFET.
Universidad Ciencia Y Tecnologia, Mar 1, 2009
Revista de la Facultad de Ingenieria
This work presents the laboratory tests of a seven level H bridge with auxiliary switches configu... more This work presents the laboratory tests of a seven level H bridge with auxiliary switches configuration. The laboratory tests results agree with the simulations already presented, showing that the proposed configuration works as expected and that this new configuration may be of interest for applications working at lower and medium power levels.
2008 International Symposium on Power Electronics, Electrical Drives, Automation and Motion, 2008
This work presents the characterization of an automotive alternator for its use in electric gener... more This work presents the characterization of an automotive alternator for its use in electric generation related with alternative energies systems. A standard truck alternator (28V 100A) had been chosen to make the tests, which was carried out in a custom adaptor attached to a 6 KW DC motor bench. The alternator curves families were obtained varying the rotor speed between 5000 and 12500 RPM, with field voltages from 0 to 28 Volts. The tests show that it is possible to obtain output power well beyond the machine nominal rating, making it a useful alternative for power generation systems.
2007 European Conference on Power Electronics and Applications, 2007
ABSTRACT This work presents an improved Power Electronics Training Platform implemented with PIC ... more ABSTRACT This work presents an improved Power Electronics Training Platform implemented with PIC microcontrollers. The original training platform, presented in [7], has been improved transferring to a FPGA circuit the control of peripheral components such as LCD displays, keyboards, A/D and D/A converters, and I/O ports. This control transfer reduces the computational load in the PIC, enabling the PIC to perform the main tasks in a faster and more precise way. These enhancements increase the usefulness of the Training Platform as a low cost training tool in a Power Electronics Laboratory.
2005 European Conference on Power Electronics and Applications, 2005
... Gerardo Ceglia, Victor M. GuzmAn, Cesar A. Orellana, Juan M. Femnndez, Maria I. Gimenez, Juli... more ... Gerardo Ceglia, Victor M. GuzmAn, Cesar A. Orellana, Juan M. Femnndez, Maria I. Gimenez, Julio Walter. ... [5] S. Lentijo, A. Monti, E. Sandi, C. Welch, and R. Dougal, A New Testing Tool For Power Electronic Digital Control, PESC Conference 2003, Columbia (USA), 2003. ...
Advances in Induction and Microwave Heating of Mineral and Organic Materials, 2011
Proceedings of the Fifth IEEE International Caracas Conference on Devices, Circuits and Systems, 2004., 2004
Page 1. A New Multilevel Inverter Topology. 1Gerardo Ceglia ; 2Vicente Grau; 3Víctor Guzmán;4Carl... more Page 1. A New Multilevel Inverter Topology. 1Gerardo Ceglia ; 2Vicente Grau; 3Víctor Guzmán;4Carlos Sánchez; 5Fernando Ibáñez; 6Julio Walter; 7Antonio Millán; 8María I. Giménez 1,3,6,7,8 Universidad Simón Bolívar (Venezuela ...
2008 13th International Power Electronics and Motion Control Conference, 2008
At present multilevel converters are technically interesting due to their high power handling cap... more At present multilevel converters are technically interesting due to their high power handling capabilities, low output harmonics level and reduced requirements in blocking voltages in the switching devices ratings and lower commutation stresses and losses. The multilevel converter configurations now in use have as their main disadvantage their circuit complexity, requiring a great number of power devices and passive components
2008 7th International Caribbean Conference on Devices, Circuits and Systems, 2008
This paper presents a single capacitor active snubber circuit for the asymmetric inverters used t... more This paper presents a single capacitor active snubber circuit for the asymmetric inverters used to drive switched reluctance motors. The proposed configuration uses the motor coil inductance as an integral component in the snubber process, acting in sequence to ensure the low-loss commutation of each inverter main power device. The two auxiliary snubber switches naturally commutate in ZCS mode. Only
2007 European Conference on Power Electronics and Applications, 2007
Page 1. Control Model of a Closed Loop Power-Controlled Series-Type Resonant Induction Heating Sy... more Page 1. Control Model of a Closed Loop Power-Controlled Series-Type Resonant Induction Heating System Julio Walter, Gerardo Ceglia, Víctor Guzmán, Maria Giménez UNIVERSIDAD SIMÓN BOLÍVAR Sartenejas-Baruta 1081, Edo. ...