12V CFL Emergency Light Circuit Using 3525 IC | Mini Inverter Circuit

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This circuit is used to drive a regular a/c cfl bulb upto 32 watts. You can try it by using more watts bulb or changing the transformer. The output of the sg3525 is fed to the transformer through two Mosfets. The pinout diagram of sg3525 is given below:

Components Required:
Resistor(1/4W):
R1- 4.7K
R2- 18K
R3- 4.7K
R4- 22E
R5- 22E
R6- 10K
R7- 10K

Capacitor:
C1- 0.001 uF (102)
C2- 100uF/25V
C3- 4.7 uF/25V
C4- 0.001 uF (102) 1Kv

Others:
U1- SG3525
L1- Choke(100 uH)
T1 – CFL Transformer (EE28)
MOSFET (Q1 & Q2) – IRF540/ IRFZ44/ P55NF06
Diode(BR) – D1-D4 – BA159
Fuse (F1) – 1A
Battery – 12V or Two 6V Battery in series or Three 4V battery in series.We can increase the backup duration by using 12v batteries of higher ampere.

The circuit do not include charging section. Tested up to 32 Watts cfl bulb without any heat sink. Can also charge mobile or tabs. Requires 12v battery of any ampere. We can also use computer ups battery.