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variable frequency 100 watt square wave inverter

VARIABLE FREQUENCY INVERTER(100 WATT SQUARE WAVE)



       this is an variable frequency 100watt square wave inverter you can also called this device as VFD(variable frequency drive ),for VFD this is only an part of VFD not an complete VFD ,this drive actually takes 220v ac from mains supply and rectify it into 12v dc ,then by the help of this inverter we can convert this 12v ac into 10,000v square wave ac(if want sine wave then an sine wave generating circuitry should be added) an oscillating or variable frequency genrating unit is added in this system to produce output  frequency of 10khz (variable)

we can also use this system as "VARIABLE FREQUENCY DRIVE WITHOUT TRANSFORMERS" by an capacitor rapidly charging and discharging method(this experiment of replacing transformer was an NASA experiment result) but by using this system we can only increase the output voltage as double of an input voltage.. 

      PARTS REQUIREMENT:

P1 = 250 k ohms
R1 & R2 = 4.7 k ohms
R3 to R6 = 0.1R - 5 Watt
C1 = 0.022uF
C2 = 220uF-25V
D1 = BY 127
D2 = 9.1v Zener Diode
Q1 & Q2 = TIP122
Q3 to Q6 = 2N3055
F1 = 10amp Fuse
IC1 = CD4047
Transformer = 12-0-12v (10 Ampere) Step Down 220 to 12v
WORKING OR DISCRIPTION :-                                      This is a 100 watt Inverter Circuit use Minimum number of Components.Here we use {CD 4047 IC} for generating the 100 Hz pulses and four {2N3055} Transistor for driving the load.The IC1 {CD 4047} wired as an Astable  multi vibrator produces two 180 degree out of phase 100 Hz pulse train.These pulse train are preamplifier by the two TIP122 Transistor.The output of the TIP122 Transistor are amplified by fout 2N3055 Transistor {Two transistor for each of half cycle} to drive the inverter transformer.The 220 AC be available at a secondary of the transformer.Nothing complex just the elementary inverter principle and the circuit great for small load like a few savers or fans. 

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