Peter Barbosa - Academia.edu (original) (raw)

Papers by Peter Barbosa

2021 IEEE Applied Power Electronics Conference and Exposition (APEC)

In this paper, a novel three-level phase-shift modulation is proposed for serial half bridge (SHB... more In this paper, a novel three-level phase-shift modulation is proposed for serial half bridge (SHB) LLC resonant converter. The proposed modulation is capable of balancing current stress for all switches to realize balanced thermal stress and their longer lifetime. The operation principle of the proposed modulation strategy is presented and analyzed in detail. ZVS conditions are discussed in different operation modes to ensure high efficiency operation in the entire load range. In addition, the proposed three-level phase-shift modulation provides additional gain range to conventional two level modulations with variable switching frequency control so that very wide output/input voltage range can be achieved. The performance of the proposed modulation is experimentally verified on a 7.5 kW SHB LLC DC/DC converter prototype.

2021 IEEE Transportation Electrification Conference & Expo (ITEC), 2021

A detailed analysis and experimental evaluation of a continuous-conduction-mode (CCM), pulse-widt... more A detailed analysis and experimental evaluation of a continuous-conduction-mode (CCM), pulse-width-modulated (PWM), boost-type active soft-switching cell suitable for 1-ph/3-ph universal-voltage-input PFC for on-board charging (OBC) applications is introduced. The soft-switching cell features zero-voltage switching (ZVS) of all switches, reduced reverse-recovery loss at any operating point, and simple control. The cell achieves high efficiency for converting low line voltage to the high dc-link voltage required for the OBC dc-dc converter. The evaluation of the concept was performed on a single-phase leg 3.4 kW prototype designed to operate at 220 VRMSline input and deliver 650 V output. The prototype achieves 97.8% efficiency at full load and 100 kHz switching frequency. The soft-switching PFC rectifier concept naturally morphs between an interleaved totem-pole converter for 1-ph ac line voltage and a 3-ph converter for 3-ph ac line voltage.

2020 IEEE Applied Power Electronics Conference and Exposition (APEC), 2020

This paper presents control methods that achieve DC-link capacitor voltage balance of a series ha... more This paper presents control methods that achieve DC-link capacitor voltage balance of a series half bridge (SHB) LLC resonant converter operating at different modulation schemes. The principle of the proposed balancing control method is analyzed and studied based on six normally used operation modes of the SHB LLC converter. DC-link capacitor voltage balancing strategies are developed separately for two common modulation schemes in SHB topology. The performance of the proposed voltage balancing control method is experimentally verified on a 7.5-kW SHB LLC DC/DC converter prototype under different operating conditions.

Of all resources on which modern manufacturing is dependent, energy is arguably the most fundamen... more Of all resources on which modern manufacturing is dependent, energy is arguably the most fundamental. It is also a resource that has long been taken for granted. Rising energy prices and concerns over greenhouse gas emissions are increasingly leading operators to critically assess their energy usage. In many sectors, the potential for energy savings is minor and gains of a couple of percent in terms of energy efficiency are celebrated as breakthroughs. Under such conditions, the prospects of achieving major energy savings seem bleak. There are technologies, however, that can deliver very significant reductions. Foremost among these is a device thatat first sight-lacks the spectacular note of high-power, high-volume processes. It doesn't make much noise or develop extreme temperatures or go through complex motions. In fact it sits in a cabinet and usually doesn't even get a mention when the overall process is explained. However, it can cut energy consumption by 42 percent, and if applied in all relevant plants worldwide, it can deliver energy savings that equate to the electrical consumption of a country such as Spain. This device is the drive. The principle is simple: In the past, the motors that powered pumps were usually run at full power all the time, with the regulation of output being achieved through valves. A drive regulates flow through direct control of the electrical power fed to the motor, so permitting friction-based controls and the associated losses to be dispensed with. The following stories provide insight into several applications and show how drives technology can and do make a difference. 1 illustrates the problem faced by system design engineers. When projecting a system, there is a degree of

2020 IEEE Applied Power Electronics Conference and Exposition (APEC), 2020

A new two-switch, single-phase, power-factor-correction (PFC), discontinuous-conduction-mode (DCM... more A new two-switch, single-phase, power-factor-correction (PFC), discontinuous-conduction-mode (DCM) boost rectifier that features zero-voltage switching (ZVS) and can achieve less than 5% input-current total harmonic distortion (THD) by injecting a simple feedforward signal obtained from input and output voltages to the output voltage feedback control is introduced. Since low THD is achieved without high bandwidth active current shaping control, the proposed topology is suitable for modern aviation applications that require line frequency up to 800 Hz. The evaluation was performed on a 320 W prototype designed to operate from 94-134 V line input and deliver 220 V dc output. The prototype achieves 2.3% THD at full load over the line frequency range from 360 Hz to 800 Hz and meets the required harmonic limits specified by the DO-160 standard that describes the environmental conditions and test procedures for airborne equipment.

Revue Abb, 2007

De toutes les ressources dont dépend l'industrie manufacturière moderne, l'énergie est sans conte... more De toutes les ressources dont dépend l'industrie manufacturière moderne, l'énergie est sans conteste celle qui lui est fondamentale, mais également celle que nous prenons depuis longtemps pour argent comptant. Or la flambée des prix de l'énergie et le réchauffement climatique incitent de plus en plus les industriels à s'interroger sur leur consommation énergétique. Dans de nombreux secteurs, les gisements d'économies d'énergie sont mineurs et des gains de rendement énergétique de 1 à 2 % sont perçus comme un réel progrès. Dans ces conditions, le potentiel d'économie semble très limité. Pour autant, des technologies existent pour réduire de manière très significative la facture énergétique. Parmi celles-ci, il est un dispositif qui, à première vue, n'a rien de spectaculaire face aux solutions qui en imposent par leur taille ou leur puissance. Il est peu bruyant, n'engendre pas de températures extrêmes et n'exécute aucun mouvement complexe. En fait, il se monte dans une armoire et il n'en est, en général, même pas fait mention dans la description d'un site industriel. Or, avec un potentiel de gain de 42 %, sa généralisation dans les usines du monde entier engendrerait des économies égales à la consommation d'électricité d'un pays comme l'Espagne ; nous avons nommé le variateur de vitesse. Le principe est simple ! Par le passé, les moteurs des pompes tournaient souvent à plein régime en permanence, la régulation des débits se faisant par vannage. Un variateur de vitesse régule, quant à lui, les débits en agissant directement sur la puissance fournie au moteur, sans consommation inutile, en contrôlant les pertes de charge et en supprimant les pertes associées. Les applications décrites ci-après donnent un aperçu des apports de la technologie de la vitesse variable. Absence de normalisation L'absence de normes sur l'efficacité énergétique explique que 90 % des installations de pompage sont mal dimensionnées et consomment en pure perte de l'énergie.

A multi-level voltage converter includes a multi-point converter circuit and at least one full br... more A multi-level voltage converter includes a multi-point converter circuit and at least one full bridge inverter circuit. The multi-point converter circuit is configured for converting a DC voltage into an intermediate multi-level voltage. The full bridge inverter circuit is electrically connected in series with the multi-point converter circuit and configured for receiving the intermediate multi-level voltage to generate a multi-level output voltage corresponding to a single phase output.

Conference Record of the 2002 IEEE Industry Applications Conference. 37th IAS Annual Meeting (Cat. No.02CH37344)

Abstract This paper presents a fixed-frequency zero-voltage-switching three-level DC/DC resonant ... more Abstract This paper presents a fixed-frequency zero-voltage-switching three-level DC/DC resonant converter. By applying phase-shift control between the primary and secondary sides of the transformer, the converter can operate at a fixed switching frequency. The ...

2001 IEEE 32nd Annual Power Electronics Specialists Conference (IEEE Cat. No.01CH37230)

Nowadays, resonant power converters are not commonly used, mainly due to their comparatively high... more Nowadays, resonant power converters are not commonly used, mainly due to their comparatively high conduction losses and component stresses. However, they are useful for some specific applications requiring low noise, high power density or high-frequency operation. In these applications, MOSFETs are the usual devices for which ZVS operation is recommended. This normally requires a switching frequency above the resonant frequency, so higher conduction and turn-off losses may be expected. In this paper, three different fixed-frequency control strategies for the ZVS full-bridge series resonant converter are analyzed and compared, in order to determine which one achieves the least conduction and turn-off losses, without losing ZVS and considering input-voltage and load variations

IEEE Transactions on Transportation Electrification

Metalurgia Y Electricidad, 2007

Proceedings of the Power Conversion Conference-Osaka 2002 (Cat. No.02TH8579), 2000

UDK 621.38.022 IFAC IA 4.0.1 Review Today's power electronics systems are typically manufactured ... more UDK 621.38.022 IFAC IA 4.0.1 Review Today's power electronics systems are typically manufactured using non-standard parts, resulting in labor-intensive manufacturing processes, increased cost and poor reliability. As a possible way to overcome these problems, this paper discusses an integrated approach to design and manufacture power electronics systems to improve performance, reliability and cost effectiveness. Addressed in the paper are the technologies being developed for integration of both power supplies and motor drives. These technologies include the planar metalization to eliminate bonding wires, the integration of power passives, the integration of current sensors, the development of power devices to facilitate integration as well as to improve performance, and the integration of necessary CAD tools to address the multidisciplinary aspects of integrated systems. The development of Integrated Power Electronics Modules (IPEMs) is demonstrated for two applications: (1) 1 kW asymmetrical half-bridge DC-DC converter and (2) 1-3 kW motor drive for heating, ventilation and air conditioning (HVAC). Electrical and thermal design tradeoffs of IPEMs and related enabling technologies are described in the paper.

2021 IEEE Applied Power Electronics Conference and Exposition (APEC)

In this paper, a novel three-level phase-shift modulation is proposed for serial half bridge (SHB... more In this paper, a novel three-level phase-shift modulation is proposed for serial half bridge (SHB) LLC resonant converter. The proposed modulation is capable of balancing current stress for all switches to realize balanced thermal stress and their longer lifetime. The operation principle of the proposed modulation strategy is presented and analyzed in detail. ZVS conditions are discussed in different operation modes to ensure high efficiency operation in the entire load range. In addition, the proposed three-level phase-shift modulation provides additional gain range to conventional two level modulations with variable switching frequency control so that very wide output/input voltage range can be achieved. The performance of the proposed modulation is experimentally verified on a 7.5 kW SHB LLC DC/DC converter prototype.

2021 IEEE Transportation Electrification Conference & Expo (ITEC), 2021

A detailed analysis and experimental evaluation of a continuous-conduction-mode (CCM), pulse-widt... more A detailed analysis and experimental evaluation of a continuous-conduction-mode (CCM), pulse-width-modulated (PWM), boost-type active soft-switching cell suitable for 1-ph/3-ph universal-voltage-input PFC for on-board charging (OBC) applications is introduced. The soft-switching cell features zero-voltage switching (ZVS) of all switches, reduced reverse-recovery loss at any operating point, and simple control. The cell achieves high efficiency for converting low line voltage to the high dc-link voltage required for the OBC dc-dc converter. The evaluation of the concept was performed on a single-phase leg 3.4 kW prototype designed to operate at 220 VRMSline input and deliver 650 V output. The prototype achieves 97.8% efficiency at full load and 100 kHz switching frequency. The soft-switching PFC rectifier concept naturally morphs between an interleaved totem-pole converter for 1-ph ac line voltage and a 3-ph converter for 3-ph ac line voltage.

2020 IEEE Applied Power Electronics Conference and Exposition (APEC), 2020

This paper presents control methods that achieve DC-link capacitor voltage balance of a series ha... more This paper presents control methods that achieve DC-link capacitor voltage balance of a series half bridge (SHB) LLC resonant converter operating at different modulation schemes. The principle of the proposed balancing control method is analyzed and studied based on six normally used operation modes of the SHB LLC converter. DC-link capacitor voltage balancing strategies are developed separately for two common modulation schemes in SHB topology. The performance of the proposed voltage balancing control method is experimentally verified on a 7.5-kW SHB LLC DC/DC converter prototype under different operating conditions.

Of all resources on which modern manufacturing is dependent, energy is arguably the most fundamen... more Of all resources on which modern manufacturing is dependent, energy is arguably the most fundamental. It is also a resource that has long been taken for granted. Rising energy prices and concerns over greenhouse gas emissions are increasingly leading operators to critically assess their energy usage. In many sectors, the potential for energy savings is minor and gains of a couple of percent in terms of energy efficiency are celebrated as breakthroughs. Under such conditions, the prospects of achieving major energy savings seem bleak. There are technologies, however, that can deliver very significant reductions. Foremost among these is a device thatat first sight-lacks the spectacular note of high-power, high-volume processes. It doesn't make much noise or develop extreme temperatures or go through complex motions. In fact it sits in a cabinet and usually doesn't even get a mention when the overall process is explained. However, it can cut energy consumption by 42 percent, and if applied in all relevant plants worldwide, it can deliver energy savings that equate to the electrical consumption of a country such as Spain. This device is the drive. The principle is simple: In the past, the motors that powered pumps were usually run at full power all the time, with the regulation of output being achieved through valves. A drive regulates flow through direct control of the electrical power fed to the motor, so permitting friction-based controls and the associated losses to be dispensed with. The following stories provide insight into several applications and show how drives technology can and do make a difference. 1 illustrates the problem faced by system design engineers. When projecting a system, there is a degree of

2020 IEEE Applied Power Electronics Conference and Exposition (APEC), 2020

A new two-switch, single-phase, power-factor-correction (PFC), discontinuous-conduction-mode (DCM... more A new two-switch, single-phase, power-factor-correction (PFC), discontinuous-conduction-mode (DCM) boost rectifier that features zero-voltage switching (ZVS) and can achieve less than 5% input-current total harmonic distortion (THD) by injecting a simple feedforward signal obtained from input and output voltages to the output voltage feedback control is introduced. Since low THD is achieved without high bandwidth active current shaping control, the proposed topology is suitable for modern aviation applications that require line frequency up to 800 Hz. The evaluation was performed on a 320 W prototype designed to operate from 94-134 V line input and deliver 220 V dc output. The prototype achieves 2.3% THD at full load over the line frequency range from 360 Hz to 800 Hz and meets the required harmonic limits specified by the DO-160 standard that describes the environmental conditions and test procedures for airborne equipment.

Revue Abb, 2007

De toutes les ressources dont dépend l'industrie manufacturière moderne, l'énergie est sans conte... more De toutes les ressources dont dépend l'industrie manufacturière moderne, l'énergie est sans conteste celle qui lui est fondamentale, mais également celle que nous prenons depuis longtemps pour argent comptant. Or la flambée des prix de l'énergie et le réchauffement climatique incitent de plus en plus les industriels à s'interroger sur leur consommation énergétique. Dans de nombreux secteurs, les gisements d'économies d'énergie sont mineurs et des gains de rendement énergétique de 1 à 2 % sont perçus comme un réel progrès. Dans ces conditions, le potentiel d'économie semble très limité. Pour autant, des technologies existent pour réduire de manière très significative la facture énergétique. Parmi celles-ci, il est un dispositif qui, à première vue, n'a rien de spectaculaire face aux solutions qui en imposent par leur taille ou leur puissance. Il est peu bruyant, n'engendre pas de températures extrêmes et n'exécute aucun mouvement complexe. En fait, il se monte dans une armoire et il n'en est, en général, même pas fait mention dans la description d'un site industriel. Or, avec un potentiel de gain de 42 %, sa généralisation dans les usines du monde entier engendrerait des économies égales à la consommation d'électricité d'un pays comme l'Espagne ; nous avons nommé le variateur de vitesse. Le principe est simple ! Par le passé, les moteurs des pompes tournaient souvent à plein régime en permanence, la régulation des débits se faisant par vannage. Un variateur de vitesse régule, quant à lui, les débits en agissant directement sur la puissance fournie au moteur, sans consommation inutile, en contrôlant les pertes de charge et en supprimant les pertes associées. Les applications décrites ci-après donnent un aperçu des apports de la technologie de la vitesse variable. Absence de normalisation L'absence de normes sur l'efficacité énergétique explique que 90 % des installations de pompage sont mal dimensionnées et consomment en pure perte de l'énergie.

A multi-level voltage converter includes a multi-point converter circuit and at least one full br... more A multi-level voltage converter includes a multi-point converter circuit and at least one full bridge inverter circuit. The multi-point converter circuit is configured for converting a DC voltage into an intermediate multi-level voltage. The full bridge inverter circuit is electrically connected in series with the multi-point converter circuit and configured for receiving the intermediate multi-level voltage to generate a multi-level output voltage corresponding to a single phase output.

Conference Record of the 2002 IEEE Industry Applications Conference. 37th IAS Annual Meeting (Cat. No.02CH37344)

Abstract This paper presents a fixed-frequency zero-voltage-switching three-level DC/DC resonant ... more Abstract This paper presents a fixed-frequency zero-voltage-switching three-level DC/DC resonant converter. By applying phase-shift control between the primary and secondary sides of the transformer, the converter can operate at a fixed switching frequency. The ...

2001 IEEE 32nd Annual Power Electronics Specialists Conference (IEEE Cat. No.01CH37230)

Nowadays, resonant power converters are not commonly used, mainly due to their comparatively high... more Nowadays, resonant power converters are not commonly used, mainly due to their comparatively high conduction losses and component stresses. However, they are useful for some specific applications requiring low noise, high power density or high-frequency operation. In these applications, MOSFETs are the usual devices for which ZVS operation is recommended. This normally requires a switching frequency above the resonant frequency, so higher conduction and turn-off losses may be expected. In this paper, three different fixed-frequency control strategies for the ZVS full-bridge series resonant converter are analyzed and compared, in order to determine which one achieves the least conduction and turn-off losses, without losing ZVS and considering input-voltage and load variations

IEEE Transactions on Transportation Electrification

Metalurgia Y Electricidad, 2007

Proceedings of the Power Conversion Conference-Osaka 2002 (Cat. No.02TH8579), 2000

UDK 621.38.022 IFAC IA 4.0.1 Review Today's power electronics systems are typically manufactured ... more UDK 621.38.022 IFAC IA 4.0.1 Review Today's power electronics systems are typically manufactured using non-standard parts, resulting in labor-intensive manufacturing processes, increased cost and poor reliability. As a possible way to overcome these problems, this paper discusses an integrated approach to design and manufacture power electronics systems to improve performance, reliability and cost effectiveness. Addressed in the paper are the technologies being developed for integration of both power supplies and motor drives. These technologies include the planar metalization to eliminate bonding wires, the integration of power passives, the integration of current sensors, the development of power devices to facilitate integration as well as to improve performance, and the integration of necessary CAD tools to address the multidisciplinary aspects of integrated systems. The development of Integrated Power Electronics Modules (IPEMs) is demonstrated for two applications: (1) 1 kW asymmetrical half-bridge DC-DC converter and (2) 1-3 kW motor drive for heating, ventilation and air conditioning (HVAC). Electrical and thermal design tradeoffs of IPEMs and related enabling technologies are described in the paper.