The figure shows a general full-bridge rectifier topology, with 48V input and 24V50A output.
But in my test, I found that the reverse peak voltage of the MOS tube was too high after loading, and the reverse peak voltage of the 200V MOS tube was as high as 240V.
Sienna 發表於 September 14, 2020
Be sure to connect this capacitor in parallel with the bus near the MOS tube.
Alicia 發表於 September 14, 2020
This method is explained, it is the smallest loop connection of the three components (whether it is a copper bar or a PCB), and the capacitor is only one of the components. Therefore, the size of the current is also comparable to the other two components, and generally CBB capacitors can meet it without entanglement.
Lucia 發表於 September 14, 2020
For some reason, maybe C1 can't be too close to the two switches, then use a small-capacity CBB capacitor to achieve this capacitance nearby to form the smallest loop connection.
The structure of the whole machine is not on the circuit board, but a separate structure. Ask how much capacity and rated current this small CBB capacitor needs, how to estimate this? And I also connected a CBB capacitor in parallel to the MOS tube, the effect seems to be average.
