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Gate Drive Design.pptx
- 1. by Shelas Sathyan, PhD. Assistant Professor Department of Electrical& Electronics Engineering National Institute of Technology Tiruchirappalli MOSFET Gate Driver Design
- 2. Power Metal Oxide Semiconductor Field-Effect Transistor (MOSFET) D S G G D S 2
- 7. D S G RG Vo Cgd Cgs D S G RG Vo Cgd Cgs Vcgd =Vo + - Vcgs = 0 Turn-On Characteristic of Power MOSFET When Vgs=0V
- 8. D S G RG Vo Cgd Cgs + - When Vgs≥VTH D S G RG Vo Cgd Cgs Vcgd = -VGS - + Vcgs = VGS + - VGS Ig
- 9. 𝑄𝑡𝑜𝑡 = 𝑉𝐺𝑆𝐶𝑔𝑠 + (𝑉𝐺𝑆 + 𝑉 𝑜)𝐶𝑔𝑑 𝐶𝑒𝑞 = 𝑄𝑡𝑜𝑡 𝑉𝐺𝑠 = 𝐶𝑔𝑠 + (1 + 𝑉 𝑜 𝑉𝐺𝑠 )𝐶𝑔𝑑 Turn-On Charge Requirement 𝐼𝑔 = 𝐶𝑒𝑞𝑉𝐺𝑆 𝑡𝑜𝑛 = 𝑄𝑡𝑜𝑡 𝑡𝑜𝑛
- 10. Turn-On Characteristic of Power MOSFET VGS Miller Plateau Qgs Qgd Qg
- 11. Turn-On Characteristic of Power MOSFET Reference: Isolated Gate Drivers— What, Why, and How? https://www.analog.com/en/analog- dialogue/articles/isolated-gate- drivers-what-why-and-how.html
- 14. MIC4451/4452
- 18. BOOTSTRAP
- 20. Buffer
- 21. Optocoupler
- 25. Reference
- 26. Magnetic Materials for Power Electronics 26
- 27. Introduction Desired characteristic of magnetic materials are: High relative permeability μr, High saturation magnetic flux density Bsat , Low coercivity Hc , High electrical resistivity ρc , High Curie temperature (Tc), low hysteresis and eddy-current losses per unit volume 27
- 28. 28
- 29. Ferromagnetic materials are thus selected for inductors and transformers in power electronic circuits 29
- 30. Ferrite Cores 30
- 31. Ferrite Widely used material for inductors and transformers in power electronics. They are made up of iron oxide (Fe2O3), combine with other metals such as cobalt (Co), copper (Cu), magnesium (Mg), manganese (Mn), nickel (Ni), silicon (Si) and zinc (Zn). Typical saturation flux density is in the range 0.25–0.45 T for the different material grades. High resistivity so lower eddy current loss. Low curie temperature. This must be taken into account while designing. 31
- 32. Most commonly used types are Mn-Zn and Ni-Zn ferrites. 32
- 33. Different shapes of ferrite core Pot core EE Core ETD Core Toroid Core PQ Core U/C Core 33
- 34. Saturation flux density of ferrite core decreases with temperature 34
- 35. Powder Core 35
- 36. Powder Core Iron or iron alloy powder is compressed with insulation materials Insulating material provide distributed air gap, so low value of effective relative permeability. The distributed gap helps to tolerate high DC current before the iron saturates Have high resistivity, low hysteresis and eddy current losses, and excellent inductance stability under both DC and AC conditions 36
- 37. Effective inductance value is stable over a wide temperature range Have high saturation flux density The lack of localized air gap eliminates a fringing effect Curie temperature is about Tc= 450◦C Effective permeability is in the range of 15-550 Basically available in toroidal shape. Sendust and MPP are available in both toroidal and E cores 37
- 38. 38
- 39. Comparison of Bsat , Max.operating frequency and Curi temperature of ferrite and powder core 39
- 40. DC bias performance comparison 40 If Inductor current have large DC component, then performance of Ferrite core is poor
- 42. Relative Cost comparison of Powder core and Ferrite 42
- 44. Performance comparison of Ferrite and Powder cores Material Core Loss DC Bias Relative Cost Saturation Flux Density (Tesla) Curie Tempe- rature Operating frequency Tempe- rature stability AmoFlux Low Better Medium 1.5 400° C 2 MHz Betetr High Flux Moderate Best Medium 1.5 500° C 1 MHz Better Sendust Low Good Low 1.0 500° C 2 MHz Good MPP Very Low Better High 0.75 460° C 2 MHz Best XFlux High Best Low 1.6 700° C 500 kHz Good Iron Powder Highest Good Lowest 1.2 - 1.5 770° C 200 kHz Poor Ferrite Lowest Poor Lowest 0.45 100 - 250° C 2MHz Poor 44
- 45. THANK YOU