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12VDC to 220VAC / 100W Inverter Schematic
The following schematics is the circuit of 100W inverter. The inverter will convert 12V DC power from battery to 22oV AC as home power replacement. The inverter can be used for small electronic appliances such as lamp, radio, phone charger, disk player etc.
The IC1 Cd4047 is an astable multivibrator, this component produces two 180 degree out of phase 1/50 Hz pulse trains. The two TIP122 transistors will preamplify pulse trains and then, the outputs of the TIP 122 transistors are amplified by the four of 2N 3055 transistors (two transistors for each half cycle) to drive the transformer. The 220V AC will be available at the secondary of the transformer. Nothing complex just the elementary inverter principle and the circuit works great for small loads like a few bulbs or fans. If you need just a low cost inverter in the region of 100 W, then this is the best.
- A 12 V car battery can be used as the 12V source.
- Use the POT R1 to set the output frequency to 50Hz.
- If you could not get a 10A rated transformer , don’t worry a 5A one will be just enough. But the allowed out put power will be reduced to 60W.
- For the transformer get a 12-0-12 V, 10A step down transformer. But here the 12-0-12 V winding will be the primary and 220V winding will be the secondary.
- Mount the IC on a IC holder.
- Use a 10 A fuse in series with the battery as shown in circuit.
- Remember, this circuit is nothing when compared to advanced PWM inverters.This is a low cost circuit meant for low scale applications.
The maximum allowed output power of an inverter depends on two factors. The maximum current rating of the transformer primary and the current rating of the driving transistors.
For example ,to get a 100 Watt output using 12 V car battery the primary current will be ~8A ,(100/12) because P=VxI. So the primary of transformer must be rated above 8A.
Also here ,each final driver transistors must be rated above 4A. Here two will be conducting parallel in each half cycle, so I=8/2 = 4A.
These are only rough calculations and enough for this circuit.
100W inverter source: http://skema-elektronik.blogspot.com/2008/12/100-watt-inverter-12v-dc-to-220v-ac.html
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