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Title: New generation polyphase resonant converter-modulators for the Korean atomic energy research institute

This paper will present operational data and performance parameters of the newest generation polyphase resonant high voltage converter modulator (HVCM) as developed and delivered to the KAERI 100 MeV ''PEFP'' accelerator [1]. The KAERI design realizes improvements from the SNS and SLAC designs [2]. To improve the IGBT switching performance at 20 kHz for the KAERI system, the HVCM utilizes the typical zero-voltage-switching (ZVS) at turn on and as well as artificial zero-current-switching (ZCS) at turn-off. The new technique of artificial ZCS technique should result in a 6 fold reduction of IGBT switching losses (3). This improves the HCVM conversion efficiency to better than 95% at full average power, which is 500 kW for the KAERI two klystron 105 kV, 50 A application. The artificial ZCS is accomplished by placing a resonant RLC circuit across the input busswork to the resonant boost transformer. This secondary resonant circuit provides a damped ''kick-back'' to assist in IGBT commutation. As the transformer input busswork is extremely low inductance (< 10 nH), the single RLC network acts like it is across each of the four IGBT collector-emitter terminals of the H-bridge switching network. We will review these topological improvements and the overall system asmore » delivered to the KAERI accelerator and provide details of the operational results.« less
Authors:
 [1] ;  [1] ;  [1]
  1. Los Alamos National Laboratory
Publication Date:
OSTI Identifier:
992212
Report Number(s):
LA-UR-09-05399; LA-UR-09-5399
TRN: US1007703
DOE Contract Number:
AC52-06NA25396
Resource Type:
Conference
Resource Relation:
Conference: European Pulsed Power Conference 2009 ; September 21, 2009 ; Geneva, Switzerland
Research Org:
Los Alamos National Laboratory (LANL)
Sponsoring Org:
DOE
Country of Publication:
United States
Language:
English
Subject:
47; 43; ACCELERATORS; DESIGN; EFFICIENCY; INDUCTANCE; KAERI; KLYSTRONS; NUCLEAR ENERGY; PERFORMANCE; STANFORD LINEAR ACCELERATOR CENTER; TRANSFORMERS