100W LOW POWER INVERTER USING CD4047



This 100W inverter circuit will works great for small loads like a fan or 2-3 bulbs/lamps. In this circuit as IC1 we used a CD 4047 IC to generate 100Hz frequency (180 degree out of phase). CD 4047 IC is from Texas Instruments. It is mostly used as Astable/Monostable signal generator device. In this circuit it is triggered as astable multivibrator by the capacitor C1 between the Pin 1 and 3 of CD4047. And VR1 is used to adjust the frequency of signal.


Four 2N3055 transistors are used to amplify the pulse trains that are pre-amplified by two TIP122 transistors. There used three transistors for each side (half cycle), one TIP122 & two 2N3055 transistor to drive the output transformer (TX in circuit). Four 2N3055 transistors are used as driving transistor. An inverters maximum output power depends on two factors; one is the max current rating of transformer’s primary winding and other factor is the current rating of driver transistors.

Transformer: Use a 12v-0-12v, 10A step-down transformer in reverse. That’s mean secondary winding (12v-0-12v) will be the primary and primary winding (220VAC side) will be the secondary (output). So that it will worked like a step-up transformer. You can also use a 5A transformer instead of 10A, if you couldn’t have 10A.  But the output power will decrease to 60 Watt.

+12VDC: A good quality 12V car battery could be used for DC 12V.

Parts list of 100watt inverter:

VR1 = 250K (Variable resistor/POT)
R1, R2 = 4.7K-1/4W Resistor
R3, R4, R5, R6 = 0.1R-5W
C1 = 0.022uF
C2 = 220uF-25V
D1 = BY127 Diode
D2 = 9.1V Zener Diode
Q1, Q4 = TIP122 Transistor
Q2, Q3, Q5, Q6 = 2N3055 Transistor
F1 = 10A Fuse
IC1 = CD4047
TX = 12-0-12V, 10A Step-down Transformer
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5 comments

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Unknown
admin
Saturday, 24 October 2015 at 10:15:00 GMT+1 ×

hi,
what should the frequency be at pins 10,11 of ic?
is it 50hz or 100hz?

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School Gate
admin
Tuesday, 2 February 2016 at 17:02:00 GMT+1 ×

Hi you can see that those two pins were not in the diagram, freequency is set between pins 1,2, and 3.
Thanks

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School Gate
admin
Tuesday, 2 February 2016 at 17:04:00 GMT+1 ×

Its a 50hz frequency at 90 degrees out of face for each of the two output pins of the IC
that means its capable of generating 100hz freq. and 180 degrees out of face

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Unknown
admin
Thursday, 28 May 2020 at 15:34:00 GMT+1 ×

Can u give the details of cascaded h bridge 5 level inverter...circuit diagram and hardware components with values

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Anonymous
admin
Friday, 18 November 2022 at 06:18:00 GMT+1 ×

Can we use 2n3055 instead of tip122

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3IG