dc/dc startup

Yea, software softstart.

Cheers

I think the sliding square wave thing will work, but I have sceptics.

So how can I Spice two 200 KHz square waves that start in phase and slowly crawl to 180 degrees apart? Over a second maybe.

Am 14.01.2025 um 17:10 schrieb john larkin:

Let the one have 199.9995 (or 200.0005) kHz.

Tilmann

Of course. They can take, say, one second to drift 180 out of phase.

Thanks.

Something like below? The squares start off in phase and one of them is shifted by V3 to end up in opposition after

You can control the rise and fall times of the squares by adjusting the amplitudes of the sines in the expressions for B1 and B2.

Jeroen Belleman

============================================================== Version 4 SHEET 1 1116 680 WIRE 128 48 128 16 WIRE 128 80 128 48 WIRE -128 96 -192 96 WIRE -80 96 -128 96 WIRE -192 160 -192 96 WIRE 128 192 128 160 WIRE -192 272 -192 240 WIRE 128 272 128 240 WIRE 128 304 128 272 WIRE 128 416 128 384 FLAG 128 192 0 FLAG 128 48 out1 FLAG -192 272 0 FLAG -128 96 p FLAG 128 416 0 FLAG 128 272 out2 SYMBOL voltage -192 144 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V3 SYMATTR Value PWL(0 0 50u {pi}) SYMBOL bv 128 64 R0 SYMATTR InstName B1 SYMATTR Value V=tanh(10*sin(time*2*pi*200k+v(p))) SYMBOL bv 128 288 R0 SYMATTR InstName B2 SYMATTR Value V=tanh(10*sin(time*2*pi*200k)) TEXT 272 104 Left 2 !.tran 100u TEXT 272 32 Left 2 ;Square waves with controlled phase. TEXT 272 64 Left 2 ;Jeroen Belleman - 20250114

That's nice. It goes from in-phase to 180 deg and then hangs there; the delta-F thing goes up to 180 degrees and then backs down.