Mini car inverter 60watts using CD4047 and BD249

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.

Mini inverter 60w using CD4047 and bd246

Figure 1 The mini car inverter 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.
Components layout of mini inverter 60w using CD4047 and bd246

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.

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