Isolation in gate drive is one critical area for designing efficient, safe and highly productive motor control systems. Learn how the latest ADI isolated gate drives can help you solve the design challenges. Analog Devices, Dara O'Sullivan PCIM 2015

1. DARA O’SULLIVAN
PCIM 2015
Isolated Gate Drivers for
Industrial Motor Drives
®

2. Presentation Outline
► Industrial motor control
► Gate drive functionality
► Gate driver parts from ADI
► System level benefits
2

3. Motors in Industrial Applications
Water Treatment
Factory Automation
Energy Production
Printing
Precision
Power
3

4. Motor Control in Industrial Applications
 Advanced Automation
 Heavy Industry
 Factory Automation
Cranes & Hoists
Elevators & Escalators
Commercial HVAC
Conveyors
Mining
Textiles
Food Bev. & Tobacco
Other Machinery Sectors
Packaging & Labelling
Printing
Paper & Paperboard
Rubber & Plastics
Woodworking
Machine Tools
Semiconductor
Robotics
Dominatedby
Inverters&Drives
Dominatedby
Servos
4

5. Motor Control System Architectures
Power
Stage
Control
Digital
Velocity
PWM
Inverter
Analog
5

6. Low Precision
Motor Control System Architectures
Power
Stage
Control
Digital
Velocity/Torque
PWM
Drive
Current
Monitoring
Bus V
Monitoring
Analog
Position
Feedback
6

7. Motor Control System Architectures
Power
Stage
Control
Digital
Velocity/Torque/Position
PWM
Servo
Current
Monitoring
Bus V
Monitoring
Position
Feedback
Analog
High Precision
7

8. Gate Driver Functionality
8
AC
Motor
AC
Gate
Drivers
PWM
• Referencing of control signal
• Drive current
• Drive voltage levels
• Isolation
• Withstand large CM voltage swing

9. Additional Gate Driver Features
+400V
(Shorted)
Input
nFault
Desat
LOAD
Output
9V
nFault
nReset
Input
Output
CollectorX
400V
250V
Load
Current
Collector
Latch
vSN
Vdc
VBH
Control
3.3V
VBL Cgd
Zdriver
vGE
Vth
i=Cgd (dVSN/dt)
9
Spurious turn-on prevention
Short circuit prevention
Asymmetric switching
• Enhanced reliability
• Optimised performance

10. Gate Driver Isolation Requirements
10
< ~25A
> ~25A
Isolated ControlNon-Isolated Control
Servos
Highenddrives
Inverters–lowenddrives
Drive Performance
PowerRating

11. ADuM7223 – Functional Isolated Gate Driver for ½ Bridge
Applications
► Functional Isolation Rating
 LGA-14 - 5x5 mm
 3.5mm creepage Input-to-output
 1000Vrms input-to-output
 1.0mm creepage between outputs
 700V output-to-output isolation
► High-speed Gate Driver
 4A Peak Drive
 Propagation Delay – 44 ns, 12ns skew
 Low voltage operation 4.5V
 Channel-to-channel matching - 5ns
 CMTI>25kV/ms
 Low cost
► Other Features
 3 UVLO pre-set options(4.5, 7,5, 11.5V)
 Thermal Shutdown
VOB
VOA
VDDA
VDDB
GNDA
GNDB
GND1
VIA
VIB
DISABLE
VDD1
1
4,7
2
5
3
14
13
12
10
9
8
5 x 5 mm, LGA-14
11

12. ADuM4135 Key Features
► Advanced Gate Driver
 Integrated Miller Clamp
 Desaturation protection
 Asymmetric switching
 Bipolar driver supply capability
► 4A peak drive output capability
► 100kV/ms CMTI
► 16 Lead Wide body SOIC
 >8mm creepage & clearance
► Low propagation delay (50ns typical), 15ns max skew
► Operating temperature range (-40 to 125ºC)
► Output Voltage Range to 30V
► 50 Year life-time for 500Vrms or 1200V dc working voltage
► Proven iCoupler Isolation (>1 Billion Channels Shipped)
 UL, CSA, VDE regulatory approvals (Pending)
12
ADuM4135

13. Selection Guide
Product ADuM3220/1 ADuM4223/ 3223 ADuM3123 ADuM7223 ADuM4135 ADuM4136
Features Basic Basic Basic Advanced
Drivers 2 2 1 2 1 1
Peak Output Current 4A 4A 4A 4A 4A, 4A
Output Vdd 18V 18V 18V 18V 35V 35V
Features
Desat Detection, Soft-
shutdown
Fault, Ready, Reset
Disable
Bipolar Supply
Miller Clamp
Split Output
Safety
Working Voltage 400Vrms
Basic
400Vrms
Reinforced
1000Vdc Basic
400Vrms
Basic
400Vrms
Functional
500Vrms
Reinforced
1200Vdc Basic
500Vrms
Reinforced
1200Vdc Basic
Creepage 4mm 4mm/ 7.6mm 4mm 3.5mm 8mm 8mm
Package R-8 R-16/ RW-16 R-8 5 x 5 LGA RW-16 RW-16
1 Min Withstand 2.5kVrms 3kVrms/ 5kVrms 2.5kVrms 2.5kVrms 5kVrms 5kVrms
13

14. System Level Benefits – Low Prop Delay Skew
► Blanking or ‘dead time’ must be inserted into the PWM
to prevent both being accidentally on at the same time
► Effect of excessive dead time include low speed
vibration, torque ripple, and harmonic heating
► ADUM4135 with 15nS prop delay skew allows use of
minimal dead time
► Decreases motor current distortion and torque ripple
 Smoother Motor operation
 Reduced bearing/coupling wear
14
Dead time insertion
500ns 1ms
𝑉𝑒 𝑟𝑟𝑜𝑟 =
𝑡 𝑑𝑒𝑎𝑑 + 𝑡 𝑜𝑛 − 𝑡 𝑜𝑓𝑓
𝑇𝑆
𝑉𝑑𝑐 − 𝑉𝑠𝑎𝑡 + 𝑉𝑑 +
𝑉𝑠𝑎𝑡 + 𝑉𝑑
2

15. ► Short Circuit Withstand time of IGBT’s is decreasing
► Delay in Signalling of Overcurrent/Error status and subsequent response must decrease in response
► ADum4135 Delay time of 50nS is ~ 10% of delay associated with similar optocouplers (>500nS)
► Allows reduced IGBT size, saves on system board space/cost
15
System Level Beneifts - Low Propagation Delay

16. ► Evaluation Boards
 EVAL-ADUM4135Z
 EVAL-ADUM4136Z
► Access to all Status signals
► Outputs for connection to Power switch
board
► User configurable external components
16
ADuM4135 Family Resources
Product Data Sheets
App Notes and Training
Videos(in development)

17. System Platforms
► Isolated Inverter Platform
 Flexible subsystem platform with significant
connectivity and evaluation capability
 Isolated current and voltage measurement and
feedback using sigma-delta modulators
 Earth-referenced controller and communications
 Open loop or sensorless motor control development
 Isolated IGBT gate drivers – ADuM4223 (-ISOINV) and
ADuM4135 (-ISOINVEP)
 Gate driver power supplies reference design
17
http://www.analog.com – Go to Design Center and
search for Isolated Inverter

18. Further Education
► www.analog.com/webcasts
18

19. Elektronik Cover Story PCIM Europe
► Gate Drive and Current Feedback Signal Isolation in Industrial Motor
Drives
19

20. 20
Thanks for listening..

21. 21
Additional Slides

22. Min or Max ADuM413x HCPL-316J ACPL-330J 1ED020I12
Working voltage
500Vrms
1200Vdc
VIORM =
1kVrms
VIORM = 1kVrms
VIORM =
1kVrms
1 minute withstand 5kVrms 5kVrms 5kVrms 3.75kVrms
VDD2 30V 30V 30V 28V
VDD1 2.3 to 5.5V 4.5 to 5.5V - 4.5 to 5.5V
Propagation delay 50ns typ 500ns 250ns 195ns
Fault Response time 50ns 3us 1.25us 2.25us
CMTI 100kV/ms 15kV/ms 15 or 50 kV/ms 50kVms
Peak Current 4A 2A 1.5A 1.5A
Rds-on 1W max 1.2 W typ 0.7/1.6W typ
Miller clamp X - X X
Desaturation X X X X
Temperature range -40 to 125 C -40 – 100C -40 to 105C -40 to 105C
Split Output X - - -
22
ADuM413x versus Competitive Solutions

23. ADuM4135 CMTI/Prop Delay versus competitors
50nS
100nS
150nS
200nS
250nS+
25kV/uS 50kV/uS 75kV/uS 100kV/uS
ADuM4135
Competitor B
Competitor B
Competitor A
CMTI
PropagationDelay
Competitor C
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