SMPS simulation topic: how to get faster simulation speed with good accuracy in QSpice?

QSPICE
1

Hi, all

Below is a two-phase buck converter eaxmple
2phase_buck_1.qsch (24.5 KB)

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image1883×921 83.2 KB

  1. the simulation stop time is 20ms and it takes about 8s cpu time, the CPU usage of QSpice is only 4.5%, any method that can improve the usage of CPU for QSpice?
    image

  2. there’s inductor current imbalance output voltage spikes when do open-loop simulation, how to eliminate the undesired imbance and spikes without reducing the simulation speed?

–Peter

2

Unfortunately, in this world, you have to pay for everything. Here’s what I got:

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image1787×987 175 KB

2phase_buck_1_AB.qsch (25.2 KB)

1 Like
3

I hope this is helpful for you. A similar issue about SMPS accuracy was discussed before.

1 Like
4

Hi, bordodynov

Thanks a lot, the new results have less current imbalance and voltage spikes, it’s ok for me.
And it really changes a lot:
.opt method=gear trtol2=0
indutor with Rser & Rpar
MOS & D model
timestep

Bad news is the simulation time x2, next i’ll try to speedup the simulation.

–Peter

5

@Engelhardt
Hi, Mike
Is there any ways to set CPU threads number or make the full use of CPU to speed-up the simulation?

– Peter

6

Hi Peter,
Here it is customary to contact the Creator of Qspice in a personal email. Go to HELP and then to Obout QSPICE and see the address.

7

Hi, mac

Thanks, * .option trtol2=0 is helpful.

–Peter

8

Thanks for reminding.
I’ll send a mail to Mike.

–Peter

9

The best solution is to run the whole controller and PWM gen within Cblock (assuming you are working with digital control).

I have Made many kinds of digital control smps (interleaved totem pole PFC+DAB), T-Type inverter, LLC converter, etc. And it run almost as fast as Plecs or PSIM.

The only potential problem is… The learning curve is crazy steep.