[en] The described charging unit of the capacity store for magnetic system of the JINR collective accelerator is intended for recharging capacitor battery energy loss value in a discharge circuit for the time not exceeding 10 ms. The developed system of automatic voltage control (AVC) for the charging unit ensures operating frequency up to 20-40 Hz, and permits to realize voltage stabilization of the capacitor battery. The three-phase thyristor converter at the inlet of the step-up trasformer of the charging unit controllable by means of the central data handing processing unit GZ 800 (development and fabrication of the GDR) is used. The experimentally measured summarized constant of time of the systems with AVC is 5-8 ms, maximum voltage at the battery of the 100 μF capacity at the frequency of 20 Hz-17.5 kV. The average magnitude of the charge current in the given regime has attained 7A. The charging unit working ability at the frequency of 20 Hz and the 5 kA discharge current has been verified