This is the most common inverter circuit based on the PWM ic of sg3525 and you will get a power output of about 500 watts will deliver. To increase the power of the inverter you need to use the larger transformer. for getting 500watts you need to use 12v 6 Ampere transformer.
PCB Layout
The sg3525 ic will oscillate at 100hz and the PWM output will be 50hz.
Calculating oscillator frequency
To calculate the frequency of the PWM ic we are using an equation.
f= 1/CT(0.7 RT + 3 RD)
Frequency calaculation of sg3525
CT – the capacitor connected with the 5 the pin of the ic ( 1uf)
RT – The resistor connected to the 6 the pin and ground (15.7 k)
RD – the resistor connected to the 5 the pin ad 7 the pin (100R)
so, the oscillator frequency is,
= 1/ 0.0000010005 (0.7 * 15700 + 3* 100)
= 1/ 0.0000010005*11290
=89 Hz
almost 90 to 100 Hz we will get ( because the values of the components are equal to the calculated values)
So the oscillator frequency is 90 to 100Hz and the switching frequency is 45 to 50 Hz.
