Silicon Carbide MOSFETs Handle with Care

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1 Control Monitor Protect Communicate Silicon Carbide MOSFETs Handle with Care Nitesh Satheesh, Applications Engineering Manager 2018 AgileSwitch, LLC 1

2 THE PROBLEMS 2018 AgileSwitch, LLC 2

3 Compromise System Design Engineers are faced with the challenge of justifying the higher cost of SiC Power Devices. Power Device Engineers are faced with the challenge of improving the device performance while reducing die area and hence cost. Application Engineers are faced with the challenge of convincing everyone that a compromise exists! 2018 AgileSwitch, LLC 3

4 Stray Inductance Gate Loop Lg Ld Lpwr Power Loop Lcs Ls Inductive Component Loop Problem Problem Classification Lg Gate Vgs Oscillations at switching events EMI Ld, Ls, Lpwr Power Vgs, Vds oscillations; Vds Overshoot on turn-off Overshoot Voltage Lcs Power Increased Switching Losses Efficiency 2018 AgileSwitch, LLC 4

5 SiC MOSFET Device Related Problems Parameter Si IGBT SiC MOSFET Verdict Channel Resistance High Low Lower conduction losses di/dt Low High Lower switching losses Short Circuit Capability Long Short Need to detect and shut down the device faster Tail Current Exists None Can operate with minimal dead time Package Standards available Some standards, but mostly unique Effect of stray Inductance Custom Gate Driver Boards needed Low High Low inductance Packaging, system design needed 2018 AgileSwitch, LLC 5

6 KEY TECHNOLOGY TO ADDRESS THE PROBLEMS 2018 AgileSwitch, LLC 6

7 Goal Performance Cost 2018 AgileSwitch, LLC 7

8 Power Device Improvement Reduce Rds(on) Reduce Package Inductance Improve System DC Link Bus Bars, Capacitors 2018 AgileSwitch, LLC 8

9 Gate Driver Advanced Control Reduced Ringing, Voltage overshoot Advanced Fault Monitoring Lower Switching Losses Enhanced Reliability Configurability Precise DSAT Control Better Diagnostics Shortened Design Cycle Design Flexibility 2018 AgileSwitch, LLC 9

10 Advanced Control In Vgs (V Gate to Source) switching transitions a plateau corresponding to the Miller Capacitance is observed. A rapid transition to and from this Miller Plateau results in lower switching losses, ringing, overshoot voltage. Augmented Switching TM is a method that includes one or more transitions and plateau rest periods AgileSwitch, LLC 10

11 Augmented Turn-Off TM Normal Operation Design Trade-Offs Higher Efficiency Overshoot Voltage Total Response time High Rg Slow gate transition Higher Switching Losses Need for Active Miller Clamp Low Rg Faster gate transition Lower Switching Losses No need for Active Miller Clamp 2018 AgileSwitch, LLC 11

12 Augmented Turn-Off TM Short Circuit Event High Rg Slow gate transition High stress in the Power Device Greater chance of device going to avalanche Low Rg Soft gate transition Lower stress in the Power Device Reduced chance of device going to avalanche 2018 AgileSwitch, LLC 12

13 Advanced Control cont. An alternate method is to use a programmable gate resistor array. The switching starts off with a low gate resistor value, increases as the miller plateau is reached and reduces again. Rg Time Method Advantages Disadvantages Augmented Switching Fast, Accurate, easy control Requires predetermined parameters Programmable Gate Resistor Array Based on closed loop feedback. Slow, Approximate, complex control 2018 AgileSwitch, LLC 13

14 Augmented Switching TM Highlights Reduce Turn-Off Loss up to 50% Reduce Turn-Off Overshoot up to 80% Detect Short Circuit up to 20% faster 2018 AgileSwitch, LLC 14

15 Augmented Switching Field Test Results Conventional Driver SC detection = 5000A AgileSwitch Driver Augmented Turn-Off Test Conditions Vds = 1000V Ids = 5000A Load = Dead Short Overshoot = 500V Current@ SC detection = 4200A Overshoot = 100V For full presentation, click here Source: Wolfspeed 2018 AgileSwitch, LLC 15

16 Advanced Fault Monitoring Monitoring of operating parameters is critical to ensure safe and reliable operation; Parameters that should be monitored include: Voltage: Input, Output Current: Output Temperature At high switching frequencies, the sampling rate, signal propagation delay etc. becomes a factor. Should the Gate Driver: Wait for the controller to respond? Preemptively respond? 2018 AgileSwitch, LLC 16

17 Advanced Fault Monitoring cont. Diagnostics Hunger for data is driving IoT expansion into Solar, EVs etc. Faults if any, should be logged along with a table of parameters that the voltage, current and temperature information at time of fault 2018 AgileSwitch, LLC 17

18 Configurability System Design Engineers should be able to quickly and efficiently change design parameters. This can be achieved with designs that incorporate software configurability of the critical parameters AgileSwitch, LLC 18

19 AgileSwitch Intelligent SiC Gate Drivers Advanced Control Augmented Switching TM Fault Monitoring 6 Unique Fault Codes vs. 1 Temperature & DC Link Monitoring Configurability Software Configurable Switching Parameters Connector Options 2018 AgileSwitch, LLC 19

20 Goal Achieved Performance Cost 2018 AgileSwitch, LLC 20

21 CASE STUDY 2018 AgileSwitch, LLC 21

22 Turn-On, Turn-Off and Short Circuit Comparison Parameter Value Units Notes Vdc 600 V DC Link Voltage Load 3 Ω Resistor Load Current 200 A Temperature 25 C Module Baseplate 1200 V Vdss Power Module 250 A 8 = 25 C 2018 AgileSwitch, LLC 22

23 200V/div 200A/div Turn-On V-Conventional Rg=5 V-Agile 3.75V, 300ns Comparative Analysis Coventional v AgileSwitch Gate Drivers SiC Power Device - Turn-On I-Conventional Rg=0.5 I-Agile 4.5V, 400ns, Rg0 I-Agile 3.75V, 300ns I-Conventional Rg=5 V-Conventional Rg=5 I-Conventional Rg=5 V-Conventional Rg=0.5 I-Conventional Rg=0.5 V-Agile 3.75V, 300ns I-Agile 3.75V, 300ns V-Agile 4.5V, 400ns, Rg0 I-Agile 4.5V, 400ns, Rg0 Vds = 600V Id = 200A V-Agile 4.5V, 400ns, Rg0 V-Conventional Rg= ns/div AgileSwitch, LLC 23

24 200V/div 200A/div Turn-Off, Overshoot Voltage Initial Comparative Analysis Conventional v AgileSwitch Gate Drivers SiC Power Device - Turn-Off V-Conventional Rg=5 I-Conventional Rg=5 V-Agile Rg0 4.5V, 400ns I-Agile Rg0 4.5, 400ns V-Agile 3.75V, 300ns I-Agile 3.75V, 300ns V-Conventional Rg=0.5 I-Conventional Rg= V-Conventional Rg=0.5 V-Agile Rg0 4.5V, 400ns V-Agile 3.75V, 300ns V-Conventional Rg= I-Conventional Rg=0.5 I-Agile Rg0 4.5, 400ns I-Conventional Rg=5 I-Agile 3.75V, 300ns Vds = 600V Id = 200A ns/div AgileSwitch, LLC 24

25 Short Circuit 1400 V-Agile 9V, 5V, 400ns, 200ns I-Agile 9V, 5V, 400ns, 200ns V-Conventional Rg=5 I-Conventional Rg= V-Conventional Rg=5 I-Conventional Rg=5 Vds = 600V Id = 1000A Rload = 0.6 ohm V/div V-Agile 9V, 5V, 400ns, I-Agile 9V, 5V, 400ns, 200ns 200ns A/div 1200 DSAT Comparative Analysis Conventional v AgileSwitch Gate Drivers SiC Power Device 50ns/div 2018 AgileSwitch, LLC

26 Results Turn-On, Turn-Off Losses, Overshoot Voltage Driver Rg (Ω) ATO Settings Overshoot (V) Turn-on loss (mj) Turn-off loss (mj) Total Loss (mj) Conventional 5 N/A AgileSwitch V, 300ns EM1 AgileSwitch 0 4.5V, 400ns EM1 Conventional 0.5 N/A Short Circuit Driver Rg (Ω) ATO Settings Short Circuit Detection Time (us) Peak Short Circuit Current (A) Overshoot (V) Conventional 5 N/A AgileSiwtch 0.5 9V, 400ns/ EM1 5V, 200ns 2018 AgileSwitch, LLC 26

27 Summary Parameter Worst Case Overshoot Voltage Switching Losses Short Circuit Detection time Peak Short Circuit Current Units V mj us A Gate Driver AgileSwitch Driver Conventional AgileSwitch Comparison notes % LOWER Overshoot Voltage % LOWER Switching Losses % FASTER Short Circuit Detection % LOWER Peak Short Circuit Current 2018 AgileSwitch, LLC 27

28 62EM1-Programmable 62mm Electrical Series Key Switch Driver Features: 7 Unique Fault conditions Temperature Monitoring, PWM Isolated High Voltage Monitoring, PWM 2 X 10W output power RoHS and UL compliant design Interface for 5V or 15V logic levels Gate drive voltage +20V/-5V Peak gate current +/-20A SiC Applications Software Programmable Features (8): Augmented Turn-Off TM (ATOff) Power supply under-voltage lockout (UVLO) Power supply over-voltage lockout (OVLO) Desaturation detection settings Dead time Fault lockout settings Automatic Reset settings 2018 AgileSwitch, LLC 28

29 SECONDARY FACTORS 2018 AgileSwitch, LLC 29

30 Cables Copious amounts of EMI is generated due to the blazingly fast switching of SiC MOSFETs This EMI creates problems with peripheral circuitry through common mode or radiated coupling System Design Engineers are aware of EMI mitigation techniques for circuits, but an often overlooked component are the cables! 2018 AgileSwitch, LLC 30

31 Cables Case Study A Power Stack was tested with the following variations of 20 Pin Cables between the controller and gate driver: Short 6 Flat Unshielded Ribbon Cable Long 15 Flat Unshielded Ribbon Cable 18 Twisted Pair Flat Shielded Ribbon Cable Short cables were found to work under all conditions, whereas the longer cables were more prone to noise pickup AgileSwitch, LLC 31

32 WHATS AHEAD 2018 AgileSwitch, LLC 32

33 Integration Necessary for widespread adoption Driver IC Series Non-Isolated Gate Driver Core High Power, High Voltage Driver IC Series Isolated Q Q Q AgileSwitch, LLC 33

34 AS100 Gate Driver IC Key Driver Features: Programmable Gate drive output voltage Augmented Switching Control TM Temperature Monitoring High Voltage Monitoring Overcurrent Protection UART Communication Applications Software Programmable Features: Augmented Turn-On TM Augmented Turn-Off TM Multi-Level parameters controlled with 0.25V step and 25ns time resolution Two independent Augmented Switching Control Sets Normal Operation DSAT Condition Power supply under-voltage lockout (UVLO) Power supply over-voltage lockout (OVLO) Over current protection DSAT voltage level and blanking time settings Fault lockout settings Automatic Reset settings 8 Fault conditions 2018 AgileSwitch, LLC 34

35 CONCLUSION 2018 AgileSwitch, LLC 35

36 Listen to the Market System Design Engineers demand high performance at a low cost. This can be achieved by: SiC Device Manufacturers: Multi-Source Standard Packaging Engineers/ System Design Engineers Use Advanced Gate Driver technologies to further improve SiC Device performance Look beyond $/A of the SiC power device 2018 AgileSwitch, LLC 36

37 About AgileSwitch 2018 AgileSwitch, LLC 37

38 Who we are Dedicated Gate Driver Design and Manufacturing Founded January 2010 by serial entrepreneurs Albert Charpentier and Rob Weber Based in Philadelphia, PA (US East Coast) Global sales, marketing and support 2018 AgileSwitch, LLC 38

39 National Labs Relationships AgileSwitch actively engages with DOE funded organizations PowerAmerica Institute Oak Ridge National Labs Jefferson National Labs Sandia National Labs AgileSwitch is also a member of working groups and road mapping committees 2018 AgileSwitch, LLC 39

40 How to Reach Us Website: Phone: (US) +44 (0) (Europe) Nitesh Satheesh: Cliff Robins: Rob Weber: 2018 AgileSwitch, LLC 40

41 Thank you 2018 AgileSwitch, LLC 41

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