TITLE : INVERTER

Course instructor : Rethwan Faiz

Subject : Industrial Electronics

Sec : C

Group : 06

Group member:

1. Hossain MD Saroar 14-27032-2

2. Rahman, Ahmed Rezaur 14-25536-1

3. Atik, Md Ataul Karim 14-25862-1

4. Ali, Md Niyamot 14-26531-2

5. Hasan Md Mehedi 14-26521-2

INVERTERDC AC

• Inverter converts DC power to AC power (any frequency & any voltage)

• Based on circuit design its frequency & voltage varies• It can be entirely electronic or may be a combination of

mechanical effects (such as a rotary apparatus) and electronic circuitry

Based on AC output inverter can be of :1.Square wave 2.Modified square wave 3.Pure sine wave

Sine WaveSine Wave

Modified Square WaveModified Square Wave

Square WaveSquare Wave

SQUARE WAVE INVERTER

• Square wave inverter can be simplifying justified with a switching scheme of full bridge converter.

• An square wave ac output voltage is synthesized from a dc input by closing and opening the switches in an appropriate sequence.

• The output voltage can be +Vdc, -Vdc, or zero, depending on which switches are closed.

OPERATION OF SIMPLE SQUARE-WAVE INVERTER

SQUARE-WAVE INVERTERS

EQUIVALENT CIRCUIT

WHEN S1-S2 TURN ON & S3-S4 OFF FOR T1 < T < T2

WHEN S1-S2 TURN OFF& S3-S4 ON FOR T2 < T < T3

BATTERY

• The runtime of an inverter is dependent on the battery power and the amount of power being drawn from the inverter at a given time.

• When attempting to add more batteries to an inverter, there are two basic options for installation:

A. Series configurationB. Parallel Configuration

Series configuration

If the goal is to increase the overall voltage of the inverter, one can daisy chain batteries in a series configuration. In a series configuration, if a single battery dies, the other batteries will not be able to power the load.

Parallel Configuration

If the goal is to increase capacity and

prolong the runtime of the inverter,

batteries can be connected in parallel. This

increases the overall ampere-hour (Ah)

rating of the battery set.

If a single battery is discharged though,

the other batteries will then discharge

through it.

ADVANTAGES• Cheap.• Can work with ordinary light bulb , fans etc. • High quality and inexpensive. • Using modified square wave and output correction waveform • Relatively stable • Full power output. • low distortion • low noise and high efficiency, suitable for use in the

communications , industrial electricity etc.

DISADVANTAGES

• Square wave output waveform and not stable enough. (Square Sine wave inverter)

• Lack of power, cannot run the appliances with same power labeled; it’s easy to damage the machine if customers are not familiar with the operation.

• Higher prices, the domestic customers know less about it. • Line is relatively complex; high technically demanding for

maintenance.

APPLICATIONS

1. Used in UPS with batteries2. Used in Solar panels3. Used as a backup purpose4. Variable speed ac motor drives,5. Aircraft power supplies,6. Induction heating,7. Uninterruptable power supply (UPS),8. High-voltage-direct-current (HVDC) transmission9. Regenerative dc/ac drives.

PWM TECHNOLOGY

• PWM or Pulse width Modulation is a technology by which we can keep the output voltage of the inverter at the rated voltage(110V AC / 220V AC).

• PWM inverter correct the output voltage according to the value of the load connected at the output.

CAUSE OF PWM USED

Dc to ac convers are know as inverters . the output voltage of a inverter can be fixed or variable at fixed or variable frequency . We can obtained variable output voltage by varying the input dc voltage and maintaining the gain of the inverter constant . On the other hand if the dc input voltage is fixed and it is not controllable ,a variable output can be obtained by varying the gain of the inverter .which we normally done by pwm technology.

WAVE SHAPE OF DC , PWM AND AC

CONCLUSION

• An inverter is an electrical circuit capable of turning DC power into AC power, while at the same time regulating the voltage, current, and frequency of the signal

• Inverters come in all different shapes and sizes, for all different purposes

• Inverters vary in output from 50 – 5,000 W

• Several different methods of changing DC power to AC power

SOME EXAMPLE OF INVERTER

THANK YOU