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So are you saying a Mosfet is a better choice then? I actually used a Mosfet for the tests. I didn't check overshoot, but seemed to hold on OK otherwise, despite being operated right at the limits. I'm aware these share the current better than an IGBT as well, although the idea with the...
Thanks guys.
My concern is, as suggested, the use of an IGBT rather than a BJT and what issues I may encounter while doing so, such as oscillations and so on. I've read some papers and hotspots on the die were mentioned. I am aware of the thermal limitations, hence why I am aiming at the...
Re: Offline Switch Mode EV chargers should be made of paralleled <3kW modules?
They are and should remain isolated.
The inverter creates a virtual 0V at 1/2 battery voltage to be able to create the 3 ph sine or trapezoidal wave output (+VE and -VE) for the motor. This document is a good...
Re: Offline Switch Mode EV chargers should be made of paralleled <3kW modules?
Cant say commercially. I would certainly not isolate mine for cost and efficiency reasons.
This might not be immediately obvious until one realizes that most vehicles nowadays have 300 and 400V battery packs and...
Re: Offline Switch Mode EV chargers should be made of paralleled &lt;3kW modules?
The easiest way to point this is to mention that whatever you see as stationary chargers (CHAdeMO being the exception) is just an AC outlet controlled by the car. They are not chargers, hence the name EVSE -...
Those aren't 'chargers' they are supply equipment.
The only thing they do is indicate the available power and provide it, trough an AC contactor, if no error is present at either end.
Its up to the vehicle charger to do the actual charge once it receives the AC supply and also to draw the...
Correct. The output current is shaped to the input voltage after being multiplied by the slow voltage loop that has a 20-30Hz bandwith.
As a result, while the instantaneous current change is kept in phase with the voltage, the average value of the input current (1A, 2A, 10A) changes slowly.
I'm...
Good description. But what I want is to quantify how much worse Ill be. Say a comparison with that achieved by a passive PF circuit.
Current on a PFC has two loops. Instantaneous is fast enough to follow the input voltage waveform. Average has a 20-30Hz bandwidth so as not to cause harmonic...
Unless the device is latching, which one doesn't have great control over.
Have you contemplated using active rectifiers rather than a buck converter to get your desired output?
I've tried it in the past, for anything above 1.5KW it does melt. These things are on continuously drawing rated power for over 4 hours, much unlike any other appliance that may draw full load for 15 minutes and then off for some more time, averaging a lower input over time.
Yep, I could have...
Cheap LED bulbs are probably the worse thing one can get, same for low quality power supplies/chargers, etc. They dont have common mode choques so not only they burn out easily if hit by a spike they can also cause noise to other appliances.
I find it very unlikely that a peak would be able to...
Is it? So how do I pull 3kW from a 13A socket with a power factor < 1?
I would have thought being able to draw rated power without melting my sockets (or somebody else's for that matter) would be an advantage.
Then again you haven't clarified what my half way PFC does less than the nice...
Thinking that way what sort of electronic appliances have you got at home?
I much prefer a buck or boost topology to a isolated of some kind. If you need isolation, add a transformer (or three for three phase) before the converter. The transformer is the first step to clean transients.
The...
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