SQUARE WAVE SOLAR INVERTER CIRCUIT

SOLAR INVERTER CIRCUIT DESCRIPTION:

The solar inverter circuit present in our project work is based on CD4049. The circuit is shown in Figure no:1

CD4049 is a CMOS hex buffer/ converter. It has inverting and non-inverting hex buffer(4049 and 4050). We are using the inverting one to drive the power MOSFET through NPN transistor. The primary objective of using CD4049 is to generate near about 50 Hz frequency from its output. We are using 4049 due to high current sink so that it can directly drive the two TTL loads. We are driving 2N3055 MOSFET through BC547 (BC548 also ). It is actually generating a push-pull pulse to trigger the MOSFET through the NPN transistor. Where one output is high other output goes low and vice versa and this process continue indefinitely for continuous pulse generation.

 you may see my post on kakochang-waterfall

Two MOSFET are connecting through the NPN TRANSSISTOR BC547 to the output of CD4049 through 1k(1/4 watt resistance). The CD4049 require 5V. Hence a voltage regulator 7805 is used. The 7805 is having a three terminal pin1 is input where we can give (5-18)V, pin 2 is ground and pin 3 is regulated output irrespective of input voltage at pin1. The output will be always 5V.To reduce any noise or ripple in the power section two 100 µF capacitor are connected across pin 1-2 and 2-3 of 7805 . We are using a step down Transformer with 12-0-12 secondary with 220V primary coil. We have select centre-tapped type transformer so that two pulses can be provided to the independent coil of the secondary output of the transformer . As we are using the transformer in the reverse direction the secondary coil is used to provide input current ( voltage). The primary coil will give the output . After stepping up the input voltage we are receiving the approximate 180V AC which is enough to drive a CFL or a TUBELIGHT or a AC LED lamp. We are getting near around 40 watt output by using a 12V , 7.2AH lead acid battery. To change the battery from solar power we are using a 12V, 10watt solar panel through a rectifier diode so that the panel does not get reverse current from the battery.

                                                           Figure no:1 Solar inverter circuit

COMPONENT REQUIRED FOR THIS CIRCUIT

IC CD 4049	IC 4049
Resistors	1K Ω
Capacitor	0.22 µF
Power transistor	2N3055
Transistor	BC547
Step up Transformer 230V/12V-0-12V,5A	12V-0-12V /230V,5A
Voltage regulator IC7805	IC7805