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Switching power supplies A to Z [[electronic resource] /] / Sanjaya Maniktala
| Switching power supplies A to Z [[electronic resource] /] / Sanjaya Maniktala |
| Autore | Maniktala Sanjaya |
| Edizione | [1st edition] |
| Pubbl/distr/stampa | Burlington, MA, : Newnes, an imprint of Elsevier, c2006 |
| Descrizione fisica | 1 online resource (523 p.) |
| Disciplina | 621.381044 |
| Soggetto topico |
Switching power supplies - Design and construction
Switching circuits - Design and construction Electric current converters |
| Soggetto genere / forma | Electronic books. |
| ISBN |
1-280-63133-3
9786610631339 0-08-046155-7 |
| Formato | Materiale a stampa  |
| Livello bibliografico | Monografia |
| Lingua di pubblicazione | eng |
| Nota di contenuto |
Front cover; Title page; Copyright Page; Contents; Preface; Acknowledgements; CHAPTER 1 - The Principles of Switching Power Conversion; Introduction; Overview and Basic Terminology; Understanding the Inductor; Evolution of Switching Topologies; CHAPTER 2 - DC-DC Converter Design and Magnetics; DC Transfer Functions; The DC Level and the "Swing" of the Inductor Current Waveform; De.ning the AC, DC, and Peak Currents; Understanding the AC, DC and Peak Currents; Defining the "Worst-case" Input Voltage; The Current Ripple Ratio 'r'; Relating r to the Inductance; The Optimum Value of r
Do We Mean Inductor? Or Inductance?How Inductance and Inductor Size Depend on Frequency; How Inductance and Inductor Size Depend on Load Current; How Vendors Specify the Current Rating of an Off-the-shelf Inductor and How to Select It; What Is the Inductor Current Rating We Need to Consider for a Given Application?; The Spread and Tolerance of the Current Limit; Worked Example (1); Worked Examples (2, 3, and 4); Worked Example (5)-When Not to Increase the Number of Turns; Worked Example (6)-Characterizing an Off-the-shelf Inductor in a Specific Application Calculating the "Other" Worst-case StressesCHAPTER 3 - Off-line Converter Design and Magnetics; Flyback Converter Magnetics; Forward Converter Magnetics; CHAPTER 4 - The Topology FAQ; Questions and Answers; CHAPTER 5 - Conduction and Switching Losses; Switching a Resistive Load; Switching an Inductive Load; Switching Losses and Conduction Loss; A Simplified Model of the Mosfet for Studying Inductive Switching Losses; The Parasitic Capacitances Expressed in an Alternate System; Gate Threshold Voltage; The Turn-on Transition; The Turn-off Transition; Gate Charge Factors; Worked Example Applying the Switching Loss Analysis to Switching TopologiesWorst-case Input Voltage for Switching Losses; How Switching Losses Vary with the Parasitic Capacitances; Optimizing Driver Capability vis-à-vis Mosfet Characteristics; CHAPTER 6 - Printed Circuit Board Layout; Introduction; Trace Section Analysis; Some Points to Keep in Mind During Layout; Thermal Management Concerns; CHAPTER 7 - Feedback Loop Analysis and Stability; Transfer Functions, Time Constant and the Forcing Function; Understanding 'e' and Plotting Curves on Log Scales; Time Domain and Frequency Domain Analysis Complex RepresentationNonrepetitive Stimuli; The s-plane; Laplace Transform; Disturbances and the Role of Feedback; Transfer Function of the RC Filter; The Integrator Op-amp ("pole-at-zero" filter); Mathematics in the Log Plane; Transfer Function of the LC Filter; Summary of Transfer Functions of Passive Filters; Poles and Zeros; Interaction of Poles and Zeros; Closed and Open Loop Gain; The Voltage Divider; Pulse Width Modulator Transfer Function (gain); Voltage Feedforward; Power Stage Transfer Function; Plant Transfer Functions of All the Topologies; Boost Converter Feedback Stage Transfer Functions |
| Record Nr. | UNINA-9910457352103321 |
Maniktala Sanjaya
|
||
| Burlington, MA, : Newnes, an imprint of Elsevier, c2006 | ||
| Materiale a stampa | ||
| Lo trovi qui: Univ. Federico II | ||
| ||
Switching power supplies A to Z [[electronic resource] /] / Sanjaya Maniktala
| Switching power supplies A to Z [[electronic resource] /] / Sanjaya Maniktala |
| Autore | Maniktala Sanjaya |
| Edizione | [1st edition] |
| Pubbl/distr/stampa | Burlington, MA, : Newnes, an imprint of Elsevier, c2006 |
| Descrizione fisica | 1 online resource (523 p.) |
| Disciplina | 621.381044 |
| Soggetto topico |
Switching power supplies - Design and construction
Switching circuits - Design and construction Electric current converters |
| ISBN |
1-280-63133-3
9786610631339 0-08-046155-7 |
| Formato | Materiale a stampa |
| Livello bibliografico | Monografia |
| Lingua di pubblicazione | eng |
| Nota di contenuto |
Front cover; Title page; Copyright Page; Contents; Preface; Acknowledgements; CHAPTER 1 - The Principles of Switching Power Conversion; Introduction; Overview and Basic Terminology; Understanding the Inductor; Evolution of Switching Topologies; CHAPTER 2 - DC-DC Converter Design and Magnetics; DC Transfer Functions; The DC Level and the "Swing" of the Inductor Current Waveform; De.ning the AC, DC, and Peak Currents; Understanding the AC, DC and Peak Currents; Defining the "Worst-case" Input Voltage; The Current Ripple Ratio 'r'; Relating r to the Inductance; The Optimum Value of r
Do We Mean Inductor? Or Inductance?How Inductance and Inductor Size Depend on Frequency; How Inductance and Inductor Size Depend on Load Current; How Vendors Specify the Current Rating of an Off-the-shelf Inductor and How to Select It; What Is the Inductor Current Rating We Need to Consider for a Given Application?; The Spread and Tolerance of the Current Limit; Worked Example (1); Worked Examples (2, 3, and 4); Worked Example (5)-When Not to Increase the Number of Turns; Worked Example (6)-Characterizing an Off-the-shelf Inductor in a Specific Application Calculating the "Other" Worst-case StressesCHAPTER 3 - Off-line Converter Design and Magnetics; Flyback Converter Magnetics; Forward Converter Magnetics; CHAPTER 4 - The Topology FAQ; Questions and Answers; CHAPTER 5 - Conduction and Switching Losses; Switching a Resistive Load; Switching an Inductive Load; Switching Losses and Conduction Loss; A Simplified Model of the Mosfet for Studying Inductive Switching Losses; The Parasitic Capacitances Expressed in an Alternate System; Gate Threshold Voltage; The Turn-on Transition; The Turn-off Transition; Gate Charge Factors; Worked Example Applying the Switching Loss Analysis to Switching TopologiesWorst-case Input Voltage for Switching Losses; How Switching Losses Vary with the Parasitic Capacitances; Optimizing Driver Capability vis-à-vis Mosfet Characteristics; CHAPTER 6 - Printed Circuit Board Layout; Introduction; Trace Section Analysis; Some Points to Keep in Mind During Layout; Thermal Management Concerns; CHAPTER 7 - Feedback Loop Analysis and Stability; Transfer Functions, Time Constant and the Forcing Function; Understanding 'e' and Plotting Curves on Log Scales; Time Domain and Frequency Domain Analysis Complex RepresentationNonrepetitive Stimuli; The s-plane; Laplace Transform; Disturbances and the Role of Feedback; Transfer Function of the RC Filter; The Integrator Op-amp ("pole-at-zero" filter); Mathematics in the Log Plane; Transfer Function of the LC Filter; Summary of Transfer Functions of Passive Filters; Poles and Zeros; Interaction of Poles and Zeros; Closed and Open Loop Gain; The Voltage Divider; Pulse Width Modulator Transfer Function (gain); Voltage Feedforward; Power Stage Transfer Function; Plant Transfer Functions of All the Topologies; Boost Converter Feedback Stage Transfer Functions |
| Record Nr. | UNINA-9910784355603321 |
|
Maniktala Sanjaya
|
||
| Burlington, MA, : Newnes, an imprint of Elsevier, c2006 | ||
| Materiale a stampa | ||
| Lo trovi qui: Univ. Federico II | ||
| ||
Switching power supplies A to Z / / Sanjaya Maniktala
| Switching power supplies A to Z / / Sanjaya Maniktala |
| Autore | Maniktala Sanjaya |
| Edizione | [1st edition] |
| Pubbl/distr/stampa | Burlington, MA, : Newnes, an imprint of Elsevier, c2006 |
| Descrizione fisica | 1 online resource (523 p.) |
| Disciplina |
621.381044
621.317 |
| Soggetto topico |
Switching power supplies - Design and construction
Switching circuits - Design and construction Electric current converters |
| ISBN |
9786610631339
9781280631337 1280631333 9780080461557 0080461557 |
| Formato | Materiale a stampa |
| Livello bibliografico | Monografia |
| Lingua di pubblicazione | eng |
| Nota di contenuto |
Front cover; Title page; Copyright Page; Contents; Preface; Acknowledgements; CHAPTER 1 - The Principles of Switching Power Conversion; Introduction; Overview and Basic Terminology; Understanding the Inductor; Evolution of Switching Topologies; CHAPTER 2 - DC-DC Converter Design and Magnetics; DC Transfer Functions; The DC Level and the "Swing" of the Inductor Current Waveform; De.ning the AC, DC, and Peak Currents; Understanding the AC, DC and Peak Currents; Defining the "Worst-case" Input Voltage; The Current Ripple Ratio 'r'; Relating r to the Inductance; The Optimum Value of r
Do We Mean Inductor? Or Inductance?How Inductance and Inductor Size Depend on Frequency; How Inductance and Inductor Size Depend on Load Current; How Vendors Specify the Current Rating of an Off-the-shelf Inductor and How to Select It; What Is the Inductor Current Rating We Need to Consider for a Given Application?; The Spread and Tolerance of the Current Limit; Worked Example (1); Worked Examples (2, 3, and 4); Worked Example (5)-When Not to Increase the Number of Turns; Worked Example (6)-Characterizing an Off-the-shelf Inductor in a Specific Application Calculating the "Other" Worst-case StressesCHAPTER 3 - Off-line Converter Design and Magnetics; Flyback Converter Magnetics; Forward Converter Magnetics; CHAPTER 4 - The Topology FAQ; Questions and Answers; CHAPTER 5 - Conduction and Switching Losses; Switching a Resistive Load; Switching an Inductive Load; Switching Losses and Conduction Loss; A Simplified Model of the Mosfet for Studying Inductive Switching Losses; The Parasitic Capacitances Expressed in an Alternate System; Gate Threshold Voltage; The Turn-on Transition; The Turn-off Transition; Gate Charge Factors; Worked Example Applying the Switching Loss Analysis to Switching TopologiesWorst-case Input Voltage for Switching Losses; How Switching Losses Vary with the Parasitic Capacitances; Optimizing Driver Capability vis-à-vis Mosfet Characteristics; CHAPTER 6 - Printed Circuit Board Layout; Introduction; Trace Section Analysis; Some Points to Keep in Mind During Layout; Thermal Management Concerns; CHAPTER 7 - Feedback Loop Analysis and Stability; Transfer Functions, Time Constant and the Forcing Function; Understanding 'e' and Plotting Curves on Log Scales; Time Domain and Frequency Domain Analysis Complex RepresentationNonrepetitive Stimuli; The s-plane; Laplace Transform; Disturbances and the Role of Feedback; Transfer Function of the RC Filter; The Integrator Op-amp ("pole-at-zero" filter); Mathematics in the Log Plane; Transfer Function of the LC Filter; Summary of Transfer Functions of Passive Filters; Poles and Zeros; Interaction of Poles and Zeros; Closed and Open Loop Gain; The Voltage Divider; Pulse Width Modulator Transfer Function (gain); Voltage Feedforward; Power Stage Transfer Function; Plant Transfer Functions of All the Topologies; Boost Converter Feedback Stage Transfer Functions |
| Record Nr. | UNINA-9910828012003321 |
|
Maniktala Sanjaya
|
||
| Burlington, MA, : Newnes, an imprint of Elsevier, c2006 | ||
| Materiale a stampa | ||
| Lo trovi qui: Univ. Federico II | ||
| ||
Troubleshooting switching power converters [[electronic resource] ] : a hands-on guide / / Sanjaya Maniktala
| Troubleshooting switching power converters [[electronic resource] ] : a hands-on guide / / Sanjaya Maniktala |
| Autore | Maniktala Sanjaya |
| Edizione | [1st edition] |
| Pubbl/distr/stampa | Amsterdam ; ; Boston, : Elsevier/Newnes, c2008 |
| Descrizione fisica | 1 online resource (318 p.) |
| Disciplina | 621.31/7 |
| Soggetto topico |
Electric current converters
Semiconductor switches Switching power supplies |
| Soggetto genere / forma | Electronic books. |
| ISBN |
1-281-03932-2
9786611039325 0-08-055125-4 |
| Formato | Materiale a stampa |
| Livello bibliografico | Monografia |
| Lingua di pubblicazione | eng |
| Nota di contenuto |
Front cover; Troubleshooting Switching Power Converters: A Hands-on Guide; Copyright page; Table of contents; Preface; Acknowledgments; CHAPTER 1: Thinking Power; Practice and Theory: Two Sides of the Same Coin; Leave Your Past Perceptions Behind; Choose Your Friends Carefully; Finding Solutions that Converge; The Ripple Effect in Power Supplies; Experience Does Count; No Ifs, Ands, or Buts about That; Never Ignore a Problem Until It Is Too Late; Know Your Instruments Well; Heatseekers: On the Road with Symptomatic Troubleshooting; Causality Can Be the First Casualty
Learn from (Their) MistakesThe Problem with Problem Solving; CHAPTER 2: High-Frequency Effects and the Importance of Input Decoupling; Lies, Damn Lies, and Schematics; Occupational Hazards; Watch the Feedback Trace Closely; Physical Distances Become Critical; Estimating Harmonic Amplitudes; High-Frequency Input Decoupling; Don't Forget to Place that 0.1mF Ceramic Capacitor Really Close to the IC; You Need Bulk Capacitance, Too; Where Is the "Missing" Current Coming From?; Check Your Bench Power Supply; Lack of Bulk Capacitance and/or Too Much ESR Can Play Havoc Single Ceramic Capacitor for Both Noise and Ripple,The Control Also Needs a Clean Supply Rail; Boost Topology Decoupling Is Slightly Different; CHAPTER 3: Output Noise and Filtering; Measuring Output Noise and Ripple; CHAPTER 4: Using Capacitors Wisely; Introduction; Part 1: Aluminum Electrolytics; Part 2: Ceramic Capacitors; CHAPTER 5: Maximizing the Effectiveness of the Ground Plane; How to Parallel Output Capacitors for Proper Sharing; Integrated Switcher IC Solutions Versus Controller IC Solutions; Quick Check on Current through Aluminum Capacitors Secondary Side Trace Inductances and Their Impact on Efficiency Current Return Paths in the Ground Plane; Paralleling Traces to Reduce Inductance; CHAPTER 6: Printed Circuit Board Layout for AC-DC and DC-DC Converters; Introduction; Evaluation Boards (EVBs); CHAPTER 7: Working without a Ground Plane; 384x-based Controllers on Single-sided Boards; Watch the Primary Side Current Loop; And the Secondary Side Current Loop, Too; The Real "Switch"; CHAPTER 8: Home-Grown Strategies in Troubleshooting; Peeling the Onion; CHAPTER 9: Effective Bench Work; Introduction; Basic Equipment CHAPTER 10: Efficiency Rules Ensure the Drive Is Adequate; Minimize Capacitive Parasitics; Proper Design of Snubbers and Clamps; Varying the Frequency; The Time-sharing Principle; Understanding the Shape of Buck Efficiency Curves; Estimating the Ratio of Conduction Loss to Switching Loss; CHAPTER 11: Magnetics, EMI, and Noise; The Wish List; Twisting and Turning Your Way Out of EMI Problems; Location of Clamp Affects Noise, Too; A Cheat-sheet for EMI Troubleshooting; CHAPTER 12: Discussion Forums, Datasheets, and Other Real-World Issues; Thinking Is the Key; Cross-check Everything Product Liability Concerns |
| Record Nr. | UNINA-9910457718503321 |
|
Maniktala Sanjaya
|
||
| Amsterdam ; ; Boston, : Elsevier/Newnes, c2008 | ||
| Materiale a stampa | ||
| Lo trovi qui: Univ. Federico II | ||
| ||
Troubleshooting switching power converters [[electronic resource] ] : a hands-on guide / / Sanjaya Maniktala
| Troubleshooting switching power converters [[electronic resource] ] : a hands-on guide / / Sanjaya Maniktala |
| Autore | Maniktala Sanjaya |
| Edizione | [1st edition] |
| Pubbl/distr/stampa | Amsterdam ; ; Boston, : Elsevier/Newnes, c2008 |
| Descrizione fisica | 1 online resource (318 p.) |
| Disciplina | 621.31/7 |
| Soggetto topico |
Electric current converters
Semiconductor switches Switching power supplies |
| ISBN |
1-281-03932-2
9786611039325 0-08-055125-4 |
| Formato | Materiale a stampa |
| Livello bibliografico | Monografia |
| Lingua di pubblicazione | eng |
| Nota di contenuto |
Front cover; Troubleshooting Switching Power Converters: A Hands-on Guide; Copyright page; Table of contents; Preface; Acknowledgments; CHAPTER 1: Thinking Power; Practice and Theory: Two Sides of the Same Coin; Leave Your Past Perceptions Behind; Choose Your Friends Carefully; Finding Solutions that Converge; The Ripple Effect in Power Supplies; Experience Does Count; No Ifs, Ands, or Buts about That; Never Ignore a Problem Until It Is Too Late; Know Your Instruments Well; Heatseekers: On the Road with Symptomatic Troubleshooting; Causality Can Be the First Casualty
Learn from (Their) MistakesThe Problem with Problem Solving; CHAPTER 2: High-Frequency Effects and the Importance of Input Decoupling; Lies, Damn Lies, and Schematics; Occupational Hazards; Watch the Feedback Trace Closely; Physical Distances Become Critical; Estimating Harmonic Amplitudes; High-Frequency Input Decoupling; Don't Forget to Place that 0.1mF Ceramic Capacitor Really Close to the IC; You Need Bulk Capacitance, Too; Where Is the "Missing" Current Coming From?; Check Your Bench Power Supply; Lack of Bulk Capacitance and/or Too Much ESR Can Play Havoc Single Ceramic Capacitor for Both Noise and Ripple,The Control Also Needs a Clean Supply Rail; Boost Topology Decoupling Is Slightly Different; CHAPTER 3: Output Noise and Filtering; Measuring Output Noise and Ripple; CHAPTER 4: Using Capacitors Wisely; Introduction; Part 1: Aluminum Electrolytics; Part 2: Ceramic Capacitors; CHAPTER 5: Maximizing the Effectiveness of the Ground Plane; How to Parallel Output Capacitors for Proper Sharing; Integrated Switcher IC Solutions Versus Controller IC Solutions; Quick Check on Current through Aluminum Capacitors Secondary Side Trace Inductances and Their Impact on Efficiency Current Return Paths in the Ground Plane; Paralleling Traces to Reduce Inductance; CHAPTER 6: Printed Circuit Board Layout for AC-DC and DC-DC Converters; Introduction; Evaluation Boards (EVBs); CHAPTER 7: Working without a Ground Plane; 384x-based Controllers on Single-sided Boards; Watch the Primary Side Current Loop; And the Secondary Side Current Loop, Too; The Real "Switch"; CHAPTER 8: Home-Grown Strategies in Troubleshooting; Peeling the Onion; CHAPTER 9: Effective Bench Work; Introduction; Basic Equipment CHAPTER 10: Efficiency Rules Ensure the Drive Is Adequate; Minimize Capacitive Parasitics; Proper Design of Snubbers and Clamps; Varying the Frequency; The Time-sharing Principle; Understanding the Shape of Buck Efficiency Curves; Estimating the Ratio of Conduction Loss to Switching Loss; CHAPTER 11: Magnetics, EMI, and Noise; The Wish List; Twisting and Turning Your Way Out of EMI Problems; Location of Clamp Affects Noise, Too; A Cheat-sheet for EMI Troubleshooting; CHAPTER 12: Discussion Forums, Datasheets, and Other Real-World Issues; Thinking Is the Key; Cross-check Everything Product Liability Concerns |
| Record Nr. | UNINA-9910784350903321 |
|
Maniktala Sanjaya
|
||
| Amsterdam ; ; Boston, : Elsevier/Newnes, c2008 | ||
| Materiale a stampa | ||
| Lo trovi qui: Univ. Federico II | ||
| ||
Troubleshooting switching power converters : a hands-on guide / / Sanjaya Maniktala
| Troubleshooting switching power converters : a hands-on guide / / Sanjaya Maniktala |
| Autore | Maniktala Sanjaya |
| Edizione | [1st edition] |
| Pubbl/distr/stampa | Amsterdam ; ; Boston, : Elsevier/Newnes, c2008 |
| Descrizione fisica | 1 online resource (318 p.) |
| Disciplina | 621.31/7 |
| Soggetto topico |
Electric current converters
Semiconductor switches Switching power supplies |
| ISBN |
9786611039325
9781281039323 1281039322 9780080551258 0080551254 |
| Formato | Materiale a stampa |
| Livello bibliografico | Monografia |
| Lingua di pubblicazione | eng |
| Nota di contenuto |
Front cover; Troubleshooting Switching Power Converters: A Hands-on Guide; Copyright page; Table of contents; Preface; Acknowledgments; CHAPTER 1: Thinking Power; Practice and Theory: Two Sides of the Same Coin; Leave Your Past Perceptions Behind; Choose Your Friends Carefully; Finding Solutions that Converge; The Ripple Effect in Power Supplies; Experience Does Count; No Ifs, Ands, or Buts about That; Never Ignore a Problem Until It Is Too Late; Know Your Instruments Well; Heatseekers: On the Road with Symptomatic Troubleshooting; Causality Can Be the First Casualty
Learn from (Their) MistakesThe Problem with Problem Solving; CHAPTER 2: High-Frequency Effects and the Importance of Input Decoupling; Lies, Damn Lies, and Schematics; Occupational Hazards; Watch the Feedback Trace Closely; Physical Distances Become Critical; Estimating Harmonic Amplitudes; High-Frequency Input Decoupling; Don't Forget to Place that 0.1mF Ceramic Capacitor Really Close to the IC; You Need Bulk Capacitance, Too; Where Is the "Missing" Current Coming From?; Check Your Bench Power Supply; Lack of Bulk Capacitance and/or Too Much ESR Can Play Havoc Single Ceramic Capacitor for Both Noise and Ripple,The Control Also Needs a Clean Supply Rail; Boost Topology Decoupling Is Slightly Different; CHAPTER 3: Output Noise and Filtering; Measuring Output Noise and Ripple; CHAPTER 4: Using Capacitors Wisely; Introduction; Part 1: Aluminum Electrolytics; Part 2: Ceramic Capacitors; CHAPTER 5: Maximizing the Effectiveness of the Ground Plane; How to Parallel Output Capacitors for Proper Sharing; Integrated Switcher IC Solutions Versus Controller IC Solutions; Quick Check on Current through Aluminum Capacitors Secondary Side Trace Inductances and Their Impact on Efficiency Current Return Paths in the Ground Plane; Paralleling Traces to Reduce Inductance; CHAPTER 6: Printed Circuit Board Layout for AC-DC and DC-DC Converters; Introduction; Evaluation Boards (EVBs); CHAPTER 7: Working without a Ground Plane; 384x-based Controllers on Single-sided Boards; Watch the Primary Side Current Loop; And the Secondary Side Current Loop, Too; The Real "Switch"; CHAPTER 8: Home-Grown Strategies in Troubleshooting; Peeling the Onion; CHAPTER 9: Effective Bench Work; Introduction; Basic Equipment CHAPTER 10: Efficiency Rules Ensure the Drive Is Adequate; Minimize Capacitive Parasitics; Proper Design of Snubbers and Clamps; Varying the Frequency; The Time-sharing Principle; Understanding the Shape of Buck Efficiency Curves; Estimating the Ratio of Conduction Loss to Switching Loss; CHAPTER 11: Magnetics, EMI, and Noise; The Wish List; Twisting and Turning Your Way Out of EMI Problems; Location of Clamp Affects Noise, Too; A Cheat-sheet for EMI Troubleshooting; CHAPTER 12: Discussion Forums, Datasheets, and Other Real-World Issues; Thinking Is the Key; Cross-check Everything Product Liability Concerns |
| Record Nr. | UNINA-9910819500903321 |
|
Maniktala Sanjaya
|
||
| Amsterdam ; ; Boston, : Elsevier/Newnes, c2008 | ||
| Materiale a stampa | ||
| Lo trovi qui: Univ. Federico II | ||
| ||