DC to AC Converter circuit

My son asks me about a DC to AC converter circuit. He uses the solar system to charge the 12V battery.

Which we normally use the 12V LED lighting, because of  The power-saving and brightness enough.

But it is also expensive, and we have a lot of 5 watts Lamp should use it first.

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

We use this circuit as the 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 a Car battery and converted to AC 220V 60 watts. Then apply to appliances easily. And portability easy with Because of the small. In-circuit we use CD4047 and BD249 as the main part so is a mini circuit.

The working principle

When we connect the 12 volts into the circuit. The IC1 is set as an astable multivibrator circuit, so begins to works. Because pin 14 gets to the power supply voltage. Then, as result in IC1 start a frequency generator 50 Hz out of pin 10 and pin 11.

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

Which is an output pin of IC1 by both signals will have status always opposed. The output frequency at IC1 will be determined from R1 and C1.

So, if both values error frequency will cause the frequency output to wrong. The output from IC1 will connect with Q1 and Q2 MOSFET. Which they are a 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 sending to transformer-T1. The dual Zener diode-ZD2 and ZD3 will acts as a protector of a feedback voltage from the transformer.

The transformer-T1 will use center tap because there is 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 an inside appliance. But not more than 60watts.

How it builds
This project can be built with a universal board. Figure 2 is the component layout.

The component layout 

Prototypes, placing the device on the PCB

Soldering equipment on the copper layout

Application of DC to AC Converter circuit

Just take a 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

Figure 5 test this project and measure the output voltage.

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

or As the video below we are testing with 10 watts lamp

The components list
Resistors 0.25 watts
R1: 560K
R2: 1.2K
R3, R4: 2.2K
R5, R6: 560Ω 5W

Nonpolar capacitors, Ceramic, Mylar, Polyester
C1: 0.0082μF

Electrolytic Capacitor
C2: 47μF 16V
C3: 10μF 16V

Semiconductors
ZD1: 5.6V 0.5A Zener Diode
ZD2, ZD3: 47V 1W Zener
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 circuit

This circuit used the transistors as main parts so easy to buy in 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 is key, the oscillators circuit at 12V as AC12V then apply to the transformer step-up from 12V to 220V.

This circuit can power an 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 multivibrator form.

But now its low current cannot drive the transformer. We need to 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 shows. R1 is limit the current of LED1 to a safe level. And D1 is the protection of LED as well.

– D3 protects the wrong polarity input source.
– F1 protects too much current when short circuit.
– D1 and D2 are protecting the Max spike Current from the transformer works.

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 0.5W 5% resistors
R3,R4: 180K 0.5W 5% resistors
R7: 100K 0.5Watts 5% resistors
D1,D2,D3,D4,D5: 1N4007 Diode 1000V 1A
LED1
C3: 100uF 25V Electrolytic capacitors
C4: 0.01uF 50V Ceramic capacitors
T1: 1A, 12V ct 12V to 220V transformer
F1: 2A fuse

You may like these circuits, too.

• DC to AC converter 500W
• Four CD4047 Inverter circuits 60W-100W 12VDC to 220VAC

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