Charger: During power backups when the battery gets discharged to a considerable level, the charger section is used to charge the battery once the AC mains is restored.
How to Build an Inverter
- As per the circuit schematic first complete the assembly of the oscillator section consisting of the smaller parts and the IC. It is best done by interconnecting the component leads itself and soldering the joints.
- Next fit the power transistors into the appropriately drilled aluminum heat sinks. These are made by cutting an aluminum sheet into the given sizes and bending them at the edges so that it can be clamped.
- Do not fit the transistors directly on to the heat sinks. Use mica isolation kit to avoid direct contact and short circuiting of the transistors with each other and the ground.
- Clamp the heat sink assembly to the base of a well ventilated, sturdy, thick gauge metallic enclosure.
- Also fix the power transformer beside the heat sinks using nuts and bolts.
- Now connect the appropriate points of the assembled circuit board to the power transistors on the heat sinks.
- Finish the construction by fitting and interconnecting the external electrical “fittings” like fuses, sockets, switches, mains cord and the battery inputs.
- An optional separate power supply circuit using a 12V/3Amp. transformer may be added inside to charge the battery whenever required (see diagram).
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