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Made by: Anurag Kinger4th Year ( ECE)
101086002
MY Training at Texas Instruments
Inverter Design Topologies
HF Inverter
LF Inverter ( Analog and with MCU)
100 VA Inverter
Others Projects and Key Learning's Works
Feedbacks and Suggestions….
High Frequency Low Frequency
Based Upon Output Waveforms
Square Wave Inverter Modified Sine Wave Inverter Pure Sine Wave Inverter
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
Battery (+12V)
Current Fed Push PullCircuit
HF transformer
Microcontroller for generating PWMs, Level Sense and otherControl Circuits
Auxiliary Power Supplies
Half Bridge forCharging State IGBTs
Current and Voltage SenseCircuits
Full Bridge Circuits for50 Hz Ac Generation
+15 V
+ 5 V
- 5 V
Filter and Noiserejection circuit
Relay & SwitchOver circuit
O/P
PWM for Boost
PWM during charging
PWM for 50 HZ AC generation
• 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
AC Mains Sense
Inverter IGBTsInternal diodeActing as Rectifier
ChargingIGBTs
Microcontroller
Switchover Circuit
Load
ACMAINS
Buck Circuit
Battery
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
BatteryInverter Bridge
DoublerRectifier
Current Fed Push PullBoost Mode
Switch OverCircuit
Filter and Noise canceller
MicrocontrollerAC Mains Sense
NO MAINS
Load
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.
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.
Working OperationChallenges faced During Design
Advantages and Disadvantage
LDOFull
Bridge Driver
Controller
H-Bridge
Mains Sensing & Switching
Switch Over
Circuit
Load
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)
AC MainsSense
Switch Over
Circuit
Controller
Load
Transformer
H-Bridge
AC MainsPresent
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)
H- BridgeSwitchover Circuit
AC Mains Sense
NO MAINS
Microcontroller
LoadTransforme
r
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.
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
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
Sine Wave Generator
MUX
Driver CircuitSM72295
Current Sense
AC mains
PWM generation4 PWM drives
(inverter)2 Drives(charging)DC value as
ProportionalTo input AC
Protection circuit
H-Bridge Circuit
Transformer
Filter
Load
Battery
Switchover
AMCMains
Sense
Output VoltageSense for
inverter
Goes for protection circuit and regulation
Clamper
Regulation Circuitry
AC input AMC1100
Provides isolation
Create a DC level
Compare with reference
Invert and provide delay
relay
invert
MainsOr
Inverter mode
Charging Waveform
Or inverter waveform
Square wave generated at 50Hz
4th orderButterworth
filter
Sine wave generated
DC Value fromCharging
CircuitMUX
DC value GeneratorComparator
And PWM Generator
RampGenerator
180 phase shiftAnd dead time
generator
AH AL BH BL
INVAC Sense
Generation of PWM waves
SM 72295Driver IC
H-Bridge Circuit
CurrentSense input
Input PWM Drives
Output Gate Drives Current sense
Output to Regulation Loop
Over voltage Protection
Circuit
Switch Driver off
Battery
Transformer
Relay and Switchover Ckt
AC Mains
Load
Boost CircuitDrive and Full Bridge CircuitSwitchover CircuitCharging CircuitController SectionSense and Protection Circuit
Battery +12 VBoost CircuitDrive andFull BridgeCircuit
Sense and Protection Circuit
LOAD
Microcontroller Section
Charging Section
AC Mains
Switchover Circuit
Load, Mains, Current and Voltage Sense
PWM for chargingPWM for
Boost
Switchover signal
Thank You