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apologize if I re-ask but I would like to re-ask more in detail since I have the same issue in the past with this reference design.
I have again the following question:
What is the voltage that you are trying to control on the DC link? 60 V?
Hello, the problem seems to have found, today I found the AB phase drive Q4 Q3 at the DC-DC conversion lamp did not light, I tested and found two mosfet gate source pole short circuit, mosfet bad, I replaced and then did a little experiment, in my reference current to the reference current has not been cut into the load, the AC to the rms value of the voltage 20V, the DC voltage rises to 500V, after the second experiment, I cut the load to the reference value of the current to give the order of the reference value, to get the C-phase of the voltage and current, as well as the value of the DC bus voltage is shown in the following chart, this kind of is normal, right.Voltage in purple, current in red 。