Control of an active bouncer for an ultra precise 140 μs-solid state modulator system

In pulse modulator systems, bouncers are used for droop compensation of the main capacitor voltage. In this paper, the control of an active bouncer in a pulse modulator is described and the charging via a main charging system is analyzed. Six interleaved bouncer modules are situated on the primary side in series to the main capacitor bank, forming together with a pulse switch the pulse unit. To reduce the system complexity, the pulse unit is recharged with a single charging source. The proposed methods are verified by converter measurements on a single bouncer module. Additionally, a repeatability analysis of the pulse unit is performed and dependencies on initial voltages and switching jitters are derived. It is shown that in case of an open loop control and a standard deviation of the initial main capacitor voltage of σ_VMain(t=0) = 15 ppm and the initial bouncer input voltage of σ_VBin(t=0) = 75 ppm a pulse repeatability of PR <; 100 ppm is achievable in 99.7 % of the time.