# Sine Wave Inverter using IC 555 timer with Proteus Simulation

**INTRODUCTION:**

Inverter is an operation exactly opposite to the rectifier. Rectifier is use to convert AC to DC. Inverter is an electronic device which is used to convert DC to AC voltage of a desired frequency & magnitude. There are many types of inverter such as Single phase inverter, Three phase inverter, Amplifier type sine wave inverter, Saturated type square wave inverter, Transistorised inverter & Thyristorised inverter.

Here we discuss about the single phase sine wave inverter,

I/p voltage = 12V DC

O/p voltage = 230V AC

**THE CIRCUIT IS IMPLEMENTED ON PROTEUS. **

**APPARATUS :**

- Power Supply or Battery
- Timer IC555
- Tansformer (turns ratio 1:22)
- Diode 1N4007
- Resistors (27Ω, two 200KΩ pots)
- Capacitors (Ceramic- 0.1uF, 1nF) (Electrolytic- 100uF/25V)
- Inductor (100mH)

**CONSTRUCTION & WORKING:**

The circuit diagram shows an arrangement of 12V DC power supply, Astable multivibrator, Sine wave generator, Step up transformer, AC Voltmeter or Multimeter.Astable multivibrator is nothing but a free running multivibrator which has only has two state ‘HIGH’ state & ‘LOW’ state. There is no stable state. In this circuit, astable multivibrator generates a square wave as per the desire frequency & duty cycle. The parameters are require to control the frequency & duty cycle of square wave is Resistor R1, R2 & Capacitor C1.

The 12V DC power supply is apply as an input to a astable multivibrator. Astable multivibrator generates a square wave 10.5V amplitude and required frequency & duty cycle. Using Variable Resistor R2 we adjust the frequency square wave. The square wave is an input to the sine wave generator which is used to convert square wave into same amplitude of sine wave. But these signal is of small amplitude. These signal must be transform into high voltage AC signal. These signal is upgraded by step up transformer. The output of sinewave generator is apply to primary winding of step up transformer. Secondary winding of a transformer gives a 230V AC signal measure by AC voltmeter or Multimeter.

** ****For duty cycle(D) above 50%**

** **

**Formula:**

One cycle period T = T_{on }+ T_{off } (Sec)

Frequency F= 1/T (Hz)

Duty Cycle D(%) = ( T_{on }/ T ) * 100

Frequency F = 1.44 / ( ( R1 + 2*R2 ) C1)

Duty Cycle D(%) = ( R1 + R2 ) / ( R1 + 2*R2 )

**For duty cycle(D) = 50% or below 50%**

**Formula:**

One cycle period T = T_{on }+ T_{off } (Sec)

Frequency F= 1/T (Hz)

Duty Cycle D(%) = ( T_{on }/ T ) * 100

Frequency F = 1/ ( 0.693 ( R1 + R2 ) C1)

Duty Cycle D(%) = R1 / ( R1 + R2 )

**OUTPUT WAVEFORMS:-**

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