I'm using a current-fed Royer self resonant circuit to generate 1kV DC output voltage. The transformer is producing a sine wave of 100kHz/2kVpp (Cap-Royer = 100nF). At the output of the transformer I added a full bridge rectifier consisting of four BY203 HV diodes (2kV, <300ns), now I see that after adding the bridge rectifier the idle supply current of the Royer converter doubled from 25mA to 50mA, without adding a load!
By coincidence I found that adding a 20pF capacitor in parallel to one of the diodes is reducing the idle current to 27~30mA, but adding capacitors to two diodes (U$15, U$17) brings it back to the high current.
Is the problem here maybe that the diodes are not fast enough? I couldn't find diodes with lower recovery time for the high voltage >1.5kV.
What effect is causing the parallel capacitor to reduce the idle current?