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I use 8x STPSC30H12CWL 30A TO-247 schottky diodes (2 diodes per package), however with all that diodes in parallel, I increase the total diode parasitic capacitance, also all these TO-247 long leads also adds stray inductance.
So I will soonly switch to a SOT-227 diode module do reduce all of...
I was worried because I didn't understood where this relatively high ripple current came from, since my ripple voltage was relatively small.
In reality, the problem was the conducted CM noise made by my PSFB.
By adding an EMI filter at the output, all the current ripple was gone. I suspect...
So... I put an enclosed low-cost EMC filter that I found in my garbage bin. And the results are dramatic.
In the same conditions (110VDC out, 10ADC out) the current ripple is down to 23mA RMS and the voltage ripple to 90mV.
I still get some switching spikes tho.
To the mains but also from the charger to the vehicle, and the charger itself.
I'm starting to suspect that conducted noise is causing my problem and perturbing my current probe, I will try to put an EMI filter at the output and see what happens.
EMC standards for EV charging are defined in the IEC 61851-21-2 standard, the range of compliance is between 150kHz and 30MHz. So that 100kHz ripple should be fine I assume.
I also should try the output LC filter and see the results - a 4.7uH / 50µF low-pass has a cutoff frequency of around...
The full converter will be fully enclosed in a metallic box - also, there will be an output EMC filter (which is not the case right now).
Also, the cables going from the charger to the EV (via a CCS plug) are fully shielded.
I can try to put 1uF MLCC at the output (it's the only caps i got...
Yes, I can try to vary the inductance or the winding design.
BTW, I don't use any MLCC at the output, only 4 film capacitors (specs attached, note the low ESR).
Do these MLCCs can filter this 100kHz current ripple?
1664346883
I can imagine that the EV Li-ion battery could smooth this out a bit...
Hi,
Yes I talk about the current ripple going into my load.
It is not an electronic load but a purely resistive load (heater elements connected in parallel).
Hi everyone,
A bit new here, seeking help for my issue after many attempts to solve the problem myself...
I'm currently developping a 100kHz, 24kW PSFB for an EV charger, using a full-bridge SiC MOSFET at the input (700VDC nominal), a custom-made planar transformer, and full-bridge SiC diode...
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