• A.V.Akimov, A.A.Pachkov
  Budker Institute of Nuclear Physics, Novosibirsk, Russia

The 40 kW power supply prototype based on half-bridge inverter with zero current commutation has been developed. The power supply is to be used for VEPP-5 modulators pulse forming networks charge up to 45 kV with repetition rate up to 50 Hz. The inverter operation algorithm provides IGBT switching with zero current condition. The power supply test results are presented. The design of the step-up power transformer operating at frequency up to 30 kHz is described.

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• A.A.Pachkov, P.A.Bak
  Budker Institute of Nuclear Physics, Novosibirsk, Russia

10 kW power supply (PS) with smooth adjustment of a load current from zero up to 2 кА is described. Depending on the load requirements operating modes with stability of a load current from 5% to 0.1% and long-term instability of 0.01% are possible. Power mains isolation is up to 35 kV. PS includes the high-frequency inverter, transformer-rectifier module and the control block. The high-frequency inverter is performed on progressive ZCZVS-PS-FB (Zero Cur-rent Zero Voltage Switching - Phase Shifted - Full Bridge) topology. It provides a full range load regulation with the minimal power losses. Dynamic losses of the inverter switching do not exceed 6%. The step-down transformer secondary winding has the form of a solid turn that allows to receive low leakage inductance and high working frequency. Rectifier block is based on the current symmetric doubler circuit. Total power losses of the transformer-rectifier module is about 15%. Thus, the high-frequency conversion and doubling of a load current allow to reach high power and low weight parameters of the device. The power supply control circuit is realized on an CPLD base by "ALTERA" firm. The intellectual algorithm of inverter management provides soft switching in a full range of load variations and precision stabilization of a load current. The remote control is carried out through the CAN-interface. Oscillograms of a power supply operating modes are presented, the received results are discussed.

304

• V.E.Akimov, A.V.Bulatov, P.V. Logatchev, I.V.Kazarezov, A.A.Korepanov, D.A.Maliutin, A.A.Starostenko, A.A.Pachkov
  Budker Institute of Nuclear Physics, Novosibirsk, Russia

The electron miniaccelerator for the charged particles beam nondestructive diagnostics with operating voltage 200 kV, half-wave duration 4 mks and beam current within few mA is described. The primary circuit is switched by IGBT. The gun control and filament circuit power supply are performed through high frequency isolated transformer. The accelerating tube is performed from sectional welded metal ceramics insulator (ceramics 22 XC with diameter 95/85 mm). The accelerator test results are presented.

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