help with 1000w inverter

[janosandi]

hello Guys
im workin on 1000w inverter based on sg3524 circuit
the basic problem is when the inverter starts it has unstable volt & frequency For about 1 sec
any ideas ?

thx guys
John

Here is the circuit i use

 

[Warpspeed]

Schematic ?

 

[RichardHead]

Here we go again. Another s----- voltage mode control converter. Hasn't anyone heard of current mode control?
The SG3524 chip is ancient. I'd be surprised if it's still available.

 

[janosandi]

can u guide me plz to your new suggestion ?

 

[RichardHead]

I suggest you look up current mode controllers. Voltage mode controllers are practically obsolete, and for good reason.