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IC 555 Inverter Circuit

Need for some small power thing which always grow and mostly when no plug is in wall like in car, trailer or small house.

Making our own DC to AC IC 555 Inverter Circuit is good idea.

It can give power to many home stuff like radio, DVD player, electric shave machine and others.

Circuit Working:

Parts List:

Component TypeDescriptionQuantity
Resistors (All resistors are 1/4 watt unless specified)
4.7k 1
120k 1
2.7k 1
10k 1
470 ohm 1
Capacitors
PPC 100nF2
Electrolytic 2200μF 25V1
Semiconductors
Transistor BC5471
MOSFET IRF5402
IC 5551
Transformer 9-0-9V / 5A / 220V1
Battery 12V / 25Ah1

Frequency to Make with 555 IC:

To make stable 50Hz frequency we used famous 555 IC.

Frequency come from resistor Rx and capacitor Cx value.

Formula for frequency is:

f = 1 / 0.693 × (Rx + 2 × R1) × Cx

here,

When charge and discharge speed changes frequency also change.

So Cx, Rx and R1 together make timing part for frequency.

Transformer Choose:

Pick transformer with two 12V secondary wires.

Transformer must be strong for big load.

Power formula is:

P = V × I

where,

Heatsink Thinks:

Be sure heatsink for power transistor is big enough for the load.

To stop bad grounding put heatsink on isolation pad.

Or we can use different heatsinks for each transistor but they must not touch ground or touch each other.

Power Supply and Frequency Set:

Use strong 12V power between 11V to 14V is okay.

Put good fuse in line with power wire for safety.

If 50Hz is not needed then use high frequency like 100 to 300Hz to save power when not used.

Change frequency by changing Rx and Cx values.

Choose MOSFET:

Make Frequency:

Put 555 IC on breadboard.

Connect Rx and Cx to 555 IC based on what frequency we want.

Use old formula to find right resistor and capacitor for that frequency.

MOSFETs and Logic Inverter:

Put two N-type MOSFETs on breadboard.

Connect one MOSFET direct to 555 IC.

Connect second MOSFET using BC547 transistor like logic inverter.

Be sure ground and isolation is done right and to stop bad signals.

Transformer Wire:

When we connect transformer use both 12V secondary wires.

Pick transformer size based on biggest load we think to use.

Heatsink Setup:

Fix power transistors on heatsink.

Use isolation pad so no grounding happen.

Or use separate heatsink for each transistor and be sure they not touch each other or ground.

Power Supply and Fuse:

Use 12V power that works between 11V to 14V.

Add correct fuse in power line for safety.

Warning:

Conclusion:

A IC 555 Inverter Circuit is made good for small power uses, by following steps above and keeping safety rules.

When building always check wires are safe and insulation is good and safety must come first always.

References:

Why is the 555 timer IC used in inverters?

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