The document summarizes Anurag Kinger's training at Texas Instruments on inverter design topologies. It discusses his work on high frequency inverters, low frequency inverters using analog and microcontroller circuits, and a 100VA inverter. It provides details on the key components, operating modes, and challenges of designing HF and LF inverters. It also includes feedback and suggestions for proper care that must be taken during high voltage debugging and ensuring controller waveforms are in proper phasing.

1. MY Training at Texas
Instruments
Made by: anurag Kinger
4 th year ( eCe)
101086002

2. Inverter Design Topologies
HF Inverter
LF Inverter ( Analog and with MCU)
100 VA Inverter
Others Projects and Key Learning's Works
Feedbacks and Suggestions….

3.  High Frequency
 Low Frequency
Based Upon Output Waveforms
 Square Wave Inverter
 Modified Sine Wave Inverter
 Pure Sine Wave Inverter

5.  It has following Main Parts
 DC-DC Converter
 Inverter Bridge and Buck Switches
 Current and Voltage sense Circuit
 Driver Section
 Sense and Protection Circuit
 Auxiliary Power Supply
 DSP Section

6. Microcontroller for PWM
Current and
generating PWMs, for
Voltage Sense
Level Sense and other Boost
Circuits
Control Circuits
PWM for 50 HZ
AC generation PWM
during
Filter and Noise Relay & Switch O/P charging
rejection circuit Over circuit
Full Bridge Current Fed
Half Bridge for
Circuits for HF transformer Push Pull
Charging State
50 Hz Ac Circuit
IGBTs
Generation
+15 V
Auxiliary Power
+5V Supplies Battery (+12V)
-5V

7. •AC Input Range : 180V to 265V
• Relay : ON
• Inverter : OFF
• AC Output : Same as Input
• Battery Mode : Charging
• Charger IGBTs : SWITCHING
• Inverter IGBTs : OFF
• Mode : Buck

8. Switchover
Load
Circuit
AC
MAINS AC Mains
Sense Microcontroller
Battery
Inverter IGBTs
Charging
Internal diode Buck Circuit
IGBTs
Acting as Rectifier

9.  AC Input : OFF
 Relay : OFF
 Inverter : ON
 AC Output : 200V-240V,50Hz,Sine wave
 Battery Mode : Discharging
 Charger IGBTs : OFF (acts as Rectifier)
 Inverter IGBTs : SWITCHING
 Mode : Boost

10. NO
MAINS
AC Mains
Load
Sense Microcontroller
Switch Over
Circuit
Filter and Current Fed
Inverter Doubler
Noise Push Pull Battery
Bridge Rectifier
canceller Boost Mode

11.  Proper care should be taken to up DC-DC
Convertor
 Debugging is very difficult at very high voltage.
 Controller waveforms should be in proper phasing.
Otherwise short circuit can happen.
 Auxiliary supplies should be stable and proper,
otherwise controller and Driver circuit will not work
properly.

12.  Higher efficiency
 Less weight
 use high frequency transformers, much smaller
and a lot cheaper as compared to the ones used
in LF.
More complex as compared to LF .

13.  Working Operation
 Challenges faced During Design
 Advantages and Disadvantage

15. Load
H-Bridge
Switch
LDO Controller Full Bridge
Over
Driver
Circuit
Mains
Sensing &
Switching

16.  AC Input: 180V to 265V to charge battery
 AC Output: Same as AC Input (Inverter will be off)
 Battery Mode: Charging
 Charger output:
 1. CV: 13.7V
 2. Max Current: 15Amp (150Ah can be charged @
c/10 rate)

17. Switch
Over Load
Circuit
AC Mains AC Mains
Controller
Present Sense
Transformer H-Bridge

18.  AC Input: Off
 AC Output: 200V -240V, 50Hz, Sine wave
 Sine Distortion: < 5% (typical)
 Frequency: 50Hz +/- 0.01Hz
 Battery Mode: Discharging
 Battery Voltage: 12V +/-10%
 Max output power: 800 VA
 Efficiency: 70% (typically)

19. AC Mains
NO Microcontroller
Sense
MAINS
Load Switchover Transformer H- Bridge
Circuit

20.  Waveforms should be in proper phasing with each
other. Enough dead time should be there
 AC Input to AMC should be less than +/- 250mV
and Auxiliary supply should be given to primary
side of AMC otherwise it wont work in absence of
AC.
 Regulation loop should be fast.
 Design of current sense circuit with SM72295
should be done with proper care.

21.  LF design is less complex as compared to HF
design.
 Simple design is there, so need less costly
controller
 Good galvanic Isolation between AC and DC
• LF inverter are bulkier due to use of very
heavy and big transformer
• Efficiency is very less

23.  It consists of the following Parts
 Sine Wave and PWM generation (Using Analog
Circuit)
 Driver Circuit (SM 72295)
 H-Bridge Circuit
 Protection Circuit
 Current Sense and Amplifier circuit
 Switchover Circuit

24. Current Protection
Sine Wave PWM generation Sense circuit
Generator 4 PWM drives
(inverter)
MUX
2 Drives
DC value as (charging) Driver Circuit
Proportional SM72295
To input AC
Goes for
protection circuit Clamper Battery
and regulation H-Bridge
Circuit
Regulation AMC
Circuitry Mains AC mains Transformer
Sense
Filter
Output Voltage
Sense for
inverter Switchover
Load

25. Create a
DC level
AC input AMC Compare with
1100 reference
Provides isolation
Invert and provide delay
lay
inv
re
er
t
Mains
Or Charging
Inverter mode Waveform
Or inverter waveform

26. 4th order
Square wave Butterworth Sine wave
generated at 50Hz filter generated
DC Value from
Charging INV
MUX
AC Sense Circuit
DC value
Comparator Generator
180 phase shift
And PWM
And dead time
Generator
generator Ramp
Generator
AH AL BH Generation of PWM waves
BL

27. Input PWM
SM 72295 Current
Drives
Driver IC Sense input
Switch
Driver
Over voltage off Output
Protection Gate
Circuit Drives Current sense
Output to
Regulation Loop
Transformer H-Bridge
Circuit
AC Battery
Mains Relay and
Switchover Ckt Load

28.  Boost Circuit
 Drive and Full Bridge Circuit
 Switchover Circuit
 Charging Circuit
 Controller Section
 Sense and Protection Circuit

29. Load, Mains, Current and
Voltage Sense
Sense and
Protection Microcontroller
AC Mains
Circuit Section
Switchover signal
PWM for
Switchover PWM for charging
Circuit Boost
LOAD Charging
Section
Drive and
Full Bridge Boost Circuit Battery +12 V
Circuit

31. Thank You