low power inverter using cd4047

For basic requirements we can use Square Wave Inverters which is very simple, low cost and easy to make. But for driving inductive loads pure sine wave inverters are preferred. Here we are dealing with a Simple Low Power Square Wave Inverter using CD4047. It doesn`t include battery charging circuit which is present in most of the inverters. It can

be used to power up to 100w. CD4047 is a low power IC capable of operating in either in astable or monostable mode. Here it is wired in astable mode. It works by charging a capacitor (C2) through aG‚resistorG‚(RV1) as in every astable multivibrators. Variable resistor (RV1) is provided for adjusting the output frequency to exact 50Hz. The time period of the oscillation is given by the relation T = 4. 40*R*C. For detailed working of the IC, please refer its datasheet. CD4047 has two outputs (pins 10 and 11) which areG‚complementaryG‚to each other. These square wave pulses are pre amplified by TIP122 transistors. This amplified current is used to switch 2N3055 transistors to drive the inverter transformer. Two 2N3055 transistors are connected in parallel to increase the current driving capabilities. The Zener Diode ZD1 and capacitor C2 is used to provide constant 9V for the IC. When the output at pin 10 is low, pin 11 will be high Q1, Q3, Q4 turns on, current flows through the upper winding of the transformer and we will get positive half cycle output. When the output at pin 10 is high, pin 11 will be low Q2, Q5, Q6 turns on, current flows through the lower winding of the transformer and we will get negative half cycle output.

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