DC/AC inverter

The basics for a DC to AC power inverter consists of an Oscillator generating the required frequency i.e. 50/60Hz , a power amplifier using power BJT’s or Power Mosfet for driving the step up transformer.  A 550VA step-up thyroid transformer transforms the pulsating DC from the power amplifier to 220Vac.

This inverter takes in a 12Vdc and convert it to a 220Vac a modified sine kind of output is achieved which is later filtered to achieve a sine waveform.

How does this inverter works:

A battery charger has been incorporated into the design so that it charges the battery when the mains AC power is available and the inverter part is OFF during this time and the AC main voltage is made available on the output. An automatic switch over circuit is responsible for that. When there is power failure or AC mains outage the inverter switches ON, converting the battery voltage to AC.

The casing was designed with Open office Draw and laser cut on the Epilog, circuit boards were milled on the Modela.

See pictures below

Till next time

enjoy

S.Ndlovu

Soshanguve, South Africa

SLA battery cherger

the oscillator

step-up drivers

step-up transformer

the inverter(dc to ac mode)