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Hi, if both conduction loss and switching loss are proportional to load current, why is the inverter efficiency is lower at low power output, presumably the DC link voltage is fixed?
How about IGBT? I think the switching energy loss is dependent on current conducted, there is a plot of switching loss against current in the datasheet.
Hello,
Just a simple question when looking at an inverter efficiency profile. It is normal that the efficiency of an inverter rises initially with power output and then stablises. Can anyone explain why it is low at low power?
Thanks.
Thank you very much, the input DC power is around 100kw. A inverter power loss difference of 1kw between simulation and test is observed. The purpose of the test is for comparing the inverter losses of different modulation methods.
The simulation does perform a similar amount of loss reduction...
I have been working on an inverter loss simulation in Simulink, the module I used is a universal bridge with 3 legs. The inverter parameters (eg. forward voltage drop, on resistance) are obtained from manufacturer datasheet.
Two methods are used. The first method is to fetch DC link...
Hi Zapper,
Thanks a lot. Is it possible to make some modifications based on current design? Would it help if I change a smaller potentiometer to output Vref?
Hi,
I thought about your solution. The potentiometer I use is a 22k ohm one. If I manage to get an output of 3v from the 15v source, it is equivalent that there is a resistance of 17.6k ohm between 15v power source and 15v terminal of potentiometer. Is there any point to connect another 1k ohm...
Hi,
I implemented an op-amp subtractor based on the following circuit
The op-amp is a TL071 and supplied with +-15V. The Vref is obtained by connecting the common end of a potentiometer to the input and the other two terminals of the potentiometer are connected to +15V and ground. So I can...
Hi Goldsmith,
I thought about your method but I found its still not what I wanted. By using a potentiometer I can get a desired output when the original is 5V. But if the 5v input becomes 0, the output is no longer -30V. Is it posdible to output a -25V when input is 5V and to output a -30V...
Hi Goldsmith,
I see what you mean! I took for granted that the potentiometer you mentioned is similar to something very big in my lab.
I think this method should work. I should have come up with this idea earlier.
Thank you very much.
Jingzhe
Hi Goldsmith,
Thank you very much! I've thought of using external electrical devices, but I would prefer some electronic solutions. Is it possible to do this by usual electronic components? In my mind, it's a bit like an op amp subtracting circuit. The problem is the normal lab op amps are...
Hi Goldsmith,
It's a bit hard to explain my design. I am a PhD student in engineering, so I am pretty clear what Im doing.
Probably it is better not to discuss triggering IGBT in this thread. What I wish to do is just to try to find a method to shift a voltage down by 30-100V. So if I have a...
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