Hi everyone,

I made this LTSpice file for testing this 50Hz oscillator inverter

I found a transistor model but I dont see why it does not output a wave.

I used the following formula for the frequency = 1/( .7 * Rbase *C)
Regards,


JPD

 

hi j,
Couple of points, the MOSFET Gates are floating [now connected] , also it needs a kick to start it, ie: the .IC condition.
E

 

...... also note that the 2N222s will fry because the negative-going voltage on their bases exceeds the base-emitter junction breakdown voltage.

 

...... also note that the 2N222s will fry because the negative-going voltage on their bases exceeds the base-emitter junction breakdown voltage.

??? Is there a solution?

 

hi j,
It is usual to fit clamp diodes from the Bases to 0v, so the Vbe reverse does not exceed -0.7v
But this may effect the osc frequency, it is a poor design.
E

 

It is usual to fit clamp diodes from the Bases to 0v, so the Vbe reverse does not exceed -0.7v

Alternatively, a diode in series with the base input will protect the base-emitter junction.

 

Note the drain voltage and current

 

What are the values for L4 L5 L6 ?

 

Modeling the effect of magnetic fields on inductance.
The values of L1 and L2 are calculated in param.