FET SÜRME

POWER · 08 Eylül 2005, 11:19:59

Merhabalar;
Direkt olarak 16f877 ile fet sürülebilirmi.Benim bu konuda bir çalışmam oldu bazı problemler çıktı.Frekans 50 Hz, fetler aşırı ısınıyor.Bunun kontrolü nasıl yapılır,kısacası bu sorunu nasıl çözebilirim.Yorumlar için şimdiden teşekkürler.KOLAY GELSİN

cozturk · 08 Eylül 2005, 11:25:34

mosfet ise gate gerilimi 0..12V uygun. Kesin değer için mosfete ait datasheete bakınız yoksa yakarsın. "güç uygulamalarında" fet , bjt , IGBT vs ya saturasyonda ya da kesimde çalıştırlımlaıdır.

Prof.EleCTroN · 08 Eylül 2005, 11:36:32

Fetleri sürme işi yükün ve fetlerin özelliğine göre değişir. Genelde mosfetler 5 volttan daha yüksek gerilimlerde anahtarlanır. Gate gerilimi nekadar yüksek olursa iletime geçme hızı o kadar hızlı olur ve mosfetin üzerinde daha az güç harcanmış olur tabiki bu kesime giderkendende düşünülmelidir. İnternette birçok muhtelif şema bulabilirsin ayrıca birçok sürücü ic mevcuttur.

POWER · 09 Eylül 2005, 11:16:21

Yaptığım çalışma sonucunda gate geriliminin düşük olduğu kanısına vardım.Çünkü 16f877 ile sürdüğüm zaman gate gerilimi yaklaşık 2.3V bu gerilim yeterlimi bilmiyorum.Ama SG 3525 entegresi ile sürdügüm zaman gate gerilimi yaklaşık 5V civarında.Bende gate gerilimini yükseltmeyi denedim fakat yükselmedi.Bu gerilimi nasıl yükseltebilirim acaba? KOLAY GELSİN

Prof.EleCTroN · 09 Eylül 2005, 16:15:07

Basit bir örnek şema. Aşağıdaki adreslere bakmanı öneririm.

http://picproje.org/main/modules.php?name=Forums&file=viewtopic&p=1752&highlight=#1752
http://picproje.org/index.php/topic,412

Burada aradağın ve daha fazlasını bulabilirsin.

Alıntı YapTable of Contents
CHAPTER 1 Introduction to Power Semiconductors 1
General 3
1.1.1 An Introduction To Power Devices ............................................................ 5
Power MOSFET 17
1.2.1 PowerMOS Introduction ............................................................................. 19
1.2.2 Understanding Power MOSFET Switching Behaviour ............................... 29
1.2.3 Power MOSFET Drive Circuits .................................................................. 39
1.2.4 Parallel Operation of Power MOSFETs ..................................................... 49
1.2.5 Series Operation of Power MOSFETs ....................................................... 53
1.2.6 Logic Level FETS ...................................................................................... 57
1.2.7 Avalanche Ruggedness ............................................................................. 61
1.2.8 Electrostatic Discharge (ESD) Considerations .......................................... 67
1.2.9 Understanding the Data Sheet: PowerMOS .............................................. 69
High Voltage Bipolar Transistor 77
1.3.1 Introduction To High Voltage Bipolar Transistors ...................................... 79
1.3.2 Effects of Base Drive on Switching Times ................................................. 83
1.3.3 Using High Voltage Bipolar Transistors ..................................................... 91
1.3.4 Understanding The Data Sheet: High Voltage Transistors ....................... 97
CHAPTER 2 Switched Mode Power Supplies 103
Using Power Semiconductors in Switched Mode Topologies 105
2.1.1 An Introduction to Switched Mode Power Supply Topologies ................... 107
2.1.2 The Power Supply Designer's Guide to High Voltage Transistors ............ 129
2.1.3 Base Circuit Design for High Voltage Bipolar Transistors in Power
Converters ........................................................................................................... 141
2.1.4 Isolated Power Semiconductors for High Frequency Power Supply
Applications ......................................................................................................... 153
Output Rectification 159
2.2.1 Fast Recovery Epitaxial Diodes for use in High Frequency Rectification 161
2.2.2 Schottky Diodes from Philips Semiconductors .......................................... 173
2.2.3 An Introduction to Synchronous Rectifier Circuits using PowerMOS
Transistors ........................................................................................................... 179
i
Contents Power Semiconductor Applications
Philips Semiconductors
Design Examples 185
2.3.1 Mains Input 100 W Forward Converter SMPS: MOSFET and Bipolar
Transistor Solutions featuring ETD Cores ........................................................... 187
2.3.2 Flexible, Low Cost, Self-Oscillating Power Supply using an ETD34
Two-Part Coil Former and 3C85 Ferrite .............................................................. 199
Magnetics Design 205
2.4.1 Improved Ferrite Materials and Core Outlines for High Frequency Power
Supplies ............................................................................................................... 207
Resonant Power Supplies 217
2.5.1. An Introduction To Resonant Power Supplies .......................................... 219
2.5.2. Resonant Power Supply Converters - The Solution For Mains Pollution
Problems .............................................................................................................. 225
CHAPTER 3 Motor Control 241
AC Motor Control 243
3.1.1 Noiseless A.C. Motor Control: Introduction to a 20 kHz System ............... 245
3.1.2 The Effect of a MOSFET's Peak to Average Current Rating on Invertor
Efficiency ............................................................................................................. 251
3.1.3 MOSFETs and FREDFETs for Motor Drive Equipment ............................. 253
3.1.4 A Designers Guide to PowerMOS Devices for Motor Control ................... 259
3.1.5 A 300V, 40A High Frequency Inverter Pole Using Paralleled FREDFET
Modules ............................................................................................................... 273
DC Motor Control 283
3.2.1 Chopper circuits for DC motor control ....................................................... 285
3.2.2 A switched-mode controller for DC motors ................................................ 293
3.2.3 Brushless DC Motor Systems .................................................................... 301
Stepper Motor Control 307
3.3.1 Stepper Motor Control ............................................................................... 309
CHAPTER 4 Televisions and Monitors 317
Power Devices in TV & Monitor Applications (including selection
guides) 319
4.1.1 An Introduction to Horizontal Deflection .................................................... 321
4.1.2 The BU25XXA/D Range of Deflection Transistors .................................... 331
ii
Contents Power Semiconductor Applications
Philips Semiconductors
4.1.3 Philips HVT's for TV & Monitor Applications .............................................. 339
4.1.4 TV and Monitor Damper Diodes ................................................................ 345
TV Deflection Circuit Examples 349
4.2.1 Application Information for the 16 kHz Black Line Picture Tubes .............. 351
4.2.2 32 kHz / 100 Hz Deflection Circuits for the 66FS Black Line Picture Tube 361
SMPS Circuit Examples 377
4.3.1 A 70W Full Performance TV SMPS Using The TDA8380 ......................... 379
4.3.2 A Synchronous 200W SMPS for 16 and 32 kHz TV .................................. 389
Monitor Deflection Circuit Example 397
4.4.1 A Versatile 30 - 64 kHz Autosync Monitor ................................................. 399
CHAPTER 5 Automotive Power Electronics 421
Automotive Motor Control (including selection guides) 423
5.1.1 Automotive Motor Control With Philips MOSFETS .................................... 425
Automotive Lamp Control (including selection guides) 433
5.2.1 Automotive Lamp Control With Philips MOSFETS .................................... 435
The TOPFET 443
5.3.1 An Introduction to the 3 pin TOPFET ......................................................... 445
5.3.2 An Introduction to the 5 pin TOPFET ......................................................... 447
5.3.3 BUK101-50DL - a Microcontroller compatible TOPFET ............................ 449
5.3.4 Protection with 5 pin TOPFETs ................................................................. 451
5.3.5 Driving TOPFETs ....................................................................................... 453
5.3.6 High Side PWM Lamp Dimmer using TOPFET ......................................... 455
5.3.7 Linear Control with TOPFET ...................................................................... 457
5.3.8 PWM Control with TOPFET ....................................................................... 459
5.3.9 Isolated Drive for TOPFET ........................................................................ 461
5.3.10 3 pin and 5 pin TOPFET Leadforms ........................................................ 463
5.3.11 TOPFET Input Voltage ............................................................................ 465
5.3.12 Negative Input and TOPFET ................................................................... 467
5.3.13 Switching Inductive Loads with TOPFET ................................................. 469
5.3.14 Driving DC Motors with TOPFET ............................................................. 471
5.3.15 An Introduction to the High Side TOPFET ............................................... 473
5.3.16 High Side Linear Drive with TOPFET ...................................................... 475
iii
Contents Power Semiconductor Applications
Philips Semiconductors
Automotive Ignition 477
5.4.1 An Introduction to Electronic Automotive Ignition ...................................... 479
5.4.2 IGBTs for Automotive Ignition .................................................................... 481
5.4.3 Electronic Switches for Automotive Ignition ............................................... 483
CHAPTER 6 Power Control with Thyristors and Triacs 485
Using Thyristors and Triacs 487
6.1.1 Introduction to Thyristors and Triacs ......................................................... 489
6.1.2 Using Thyristors and Triacs ....................................................................... 497
6.1.3 The Peak Current Handling Capability of Thyristors .................................. 505
6.1.4 Understanding Thyristor and Triac Data .................................................... 509
Thyristor and Triac Applications 521
6.2.1 Triac Control of DC Inductive Loads .......................................................... 523
6.2.2 Domestic Power Control with Triacs and Thyristors .................................. 527
6.2.3 Design of a Time Proportional Temperature Controller ............................. 537
Hi-Com Triacs 547
6.3.1 Understanding Hi-Com Triacs ................................................................... 549
6.3.2 Using Hi-Com Triacs .................................................................................. 551
CHAPTER 7 Thermal Management 553
Thermal Considerations 555
7.1.1 Thermal Considerations for Power Semiconductors ................................. 557
7.1.2 Heat Dissipation ......................................................................................... 567
CHAPTER 8 Lighting 575
Fluorescent Lamp Control 577
8.1.1 Efficient Fluorescent Lighting using Electronic Ballasts ............................. 579
8.1.2 Electronic Ballasts - Philips Transistor Selection Guide ............................ 587
8.1.3 An Electronic Ballast - Base Drive Optimisation ........................................ 589

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