inverter topologies

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