DC to AC Converter circuits, 12V to 220VAC

My son ask me about a DC to AC converter. He use the solar system to charged the 12V battery. Which we normally use the 12V LED lighting, because The power saving and bright enough. But it is also expensive, and we have a lot of 5 watts Lamp should use it first.

This lamp use 220VAC at 5 watts, therefore we have to make the DC to AC converter circuits 12VDC to 220VAC.

We use this circuit as figure below because easy and cheap we have all parts at our store. We have two ways below!

1. Using CD4047 and MOSFET, transistors output max 60 watts

This way is easy to make, small.

The 12 volts of Car battery and converted to AC 220V 60 watt. Then apply to appliances easily. And portability easy with Because of the small. In circuit we use CD4047 and BD249 as main part so is mini circuit.

The working principle.

When we connect the 12 volts in to the circuit. The IC1 is set as astable multivibrator circuit, so begin to works because pin 14 get to power supply voltage, then result to IC1 start a frequency generator 50 Hz out of pin 10 and pin 11.


Figure 1 The mini DC to AC converter circuit of 60watts using CD4047 and BD249

Which is an output pin of IC1 by both signal will have status always opposed. The output frequency at IC1 will be detertimed from R1 and C1. Therefore if this both value error frequency will cause frequency output wrong. The output from IC1 will connected with Q1 and Q2 mosfet which is complementary circuit to increase signal rises up one step.

After that will be sent to Q3 and Q4 acts as high frequency switching and drive to Q5 and Q6.

When Q5 and Q6 received signal is amplified, the final sequence, before send to transformer-T1. The dual zener diode ZD2 and ZD3 will acts as protector a feedback voltage from transformer. The transformer-T1 will use center tap because there are 2 input voltage, T1 function to transform AC 12V from Q5 and Q6 into AC 220V and remains the same frequency. Which this voltage can be used for inside appliance. But not more than 60watts.

How to builds.
This project can be build with universal board. As Figure 2 is component layout.
Figure 2

Prototypes, placing the device on the PCB
Figure 3 Prototypes, placing the device on the PCB

Soldering equipment on the copper layout
Figure 4 Soldering equipment on the copper layout


Just take an Car battery or small motorcycle 12V, connected to the input point AC220V to be used and the appliance not over than 60 watts.

Then we test them by measure voltage output as Figure 5

Try this project and measure 220V
Figure 5 test this project and measure output voltage.

apply load and have normal voltage output
Figure 6 Then we apply lamp as load cause voltage output drop down to 210 volts.

or As video below we are testing with 10 watts lamp

The components list
Resistors 0.25 watts
R5,R6______56ohms 5watts

Nonpolar capacitors, Ceramic, Mylar, Polyester

Electrolytic Capacitor
C2______47uF 16V
C3______10uF 16V

ZD1____5.6V 0.5A Zener Diode
ZD2,ZD3_____47V 1W
Q1,Q2______BS170 Mosfet
Q3,Q4______BD139 80V 1.5A NPN transistor
Q5,Q6______BD249 NPN power transistor
IC1________ CD4047 Low Power Monostable Astable Multivibrator
T1_________1A transformer 12V CT 12V
Others, Heatsink,socket IC,Fuse,AC outlet, and etc.

2.Using All transistors for DC to AC converter

This circuit used the transistors as main parts so easy to buy any store. But too many components and parts.

How it works

We know that a transformer can increase voltage step up to high voltage. But we need the circuit can help us. The its’Key, the oscillators circuit at 12V as AC12V then apply to the transformer step up from 12V to 220V.

This circuit can power output is 10 watts max. First of all we use easy a 50Hz Square Wave Oscillator Generator circuit with Q1,Q2,R1,R2,C1,C2 is assembled as the astable multivibrater form.

But now it low current cannot driver the transformer we need use the power transistors set as Figure, both transistors on darlington compound as Q3,Q5 and Q4,Q6.

The high current transistors are 2SD313 or H1061 or TIP41, Drive 12V ct 12V to 220V Transformer output.

Others components
– The LED1 is used for power on output show. R1 is limit current of LED1 to safe level. And D1 is protection of LED as well.

– D3 is used for protect when wrong polarity input source.
– F1 used for too much current when short circuit.
– D1 and D2 are used for protect the Max spike Current from the transformer working.

Parts you will need
Q1,Q2,Q3,Q4___2SC1815,2SC945 or BC547 or CS9013 ___NPN transistors 0.5A 30V
Q5,Q6_________2SC1061,2SD313,or TIP41______________NPN transistors 3A 30V
C1,C2_________0.1uF 50V ceramic capacitors
R1,R2_________10K 0.5Watts 5% resistors
R3,R4_________180K 0.5Watts 5% resistors
R7____________100K 0.5Watts 5% resistors
D1,D2,D3,D4,D5___1N4007 Diode 1000V 1A
C3____________100uF 25V Electrolytic capacitors
C4____________0.01uF 50V Ceramic capacitors
T1___________1A, 12V ct 12V to 220V transformer
F1___________2A fuse


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