i am designing DC to AC converter. The first phase of the converter is a boost converter that will boost voltage from a 12 V battery into 30 V. Then the 30 V is fed to an inverter that will invert 30 V into 30 Vpk-pk AC signal. The ultimate output voltage of the system was required to be 230 Vrms. So i included a transformer rated 20/230V rms. When i simulate the cascade of a boost and inverter with a load, on simulations it works fine. then I designed and built and tested my boost independently and it worked properly. I also designed and built the inverter, it also worked fine. But when i test the cascade of both subsystems with a load of 77 W( overall system is rated at 120 W). the problem i am encountering is that when the load of 77 W is connected on my system the systems output voltage drops to 135 Vrms, i am not sure what might be the problem because on simulation it works fine and i a getting 230Vrms?
in the simulation it works fine but not in practice
A simulation uses a (simplified) model of reality. All models are just that, models and models are a simplification of reality. So what you have encountered is some effect which is not modeled but is present in the real world.
Let me name a few of these effects which might not be modelled:
- series resistance of wires, PCB, connectors.
- Saturation of the transformer.
- Higher than simulated on resistance of a transistor .
The engineer's approach now is to measure and simulate to see where the differences are