skip to main content

Title: Capabilities, performance, and future possibilities of high frequency polyphase resonant converters

High Frequency Polyphase Resonant Power Conditioning (PRPC) techniques developed at Los Alamos National Laboratory (LANL) are now being utilized for the Oak Ridge National Laboratory (ORNL) Spallation Neutron Source (SNS) accelerator klystron RF amplifier power systems. Three different styles of polyphase resonant converter modulators were developed for the SNS application. The various systems operate up to 140 kV, or 11 MW pulses, or up to 1.1 MW average power, all from a DC input of +/- 1.2 kV. Component improvements realized with the SNS effort coupled with new applied engineering techniques have resulted in dramatic changes in RF power conditioning topology. As an example, the high-voltage transformers are over 100 times smaller and lighter than equivalent 60 Hz versions. With resonant conversion techniques, load protective networks are not required. A shorted load de-tunes the resonance and little power transfer can occur. This provides for power conditioning systems that are inherently self-protective, with automatic fault 'ride-through' capabilities. By altering the Los Alamos design, higher power and CW power conditioning systems can be realized without further demands of the individual component voltage or current capabilities. This has led to designs that can accommodate 30 MW long pulse applications and megawatt class CWmore » systems with high efficiencies. The same PRPC techniques can also be utilized for lower average power systems ({approx}250 kW). This permits the use of significantly higher frequency conversion techniques that result in extremely compact systems with short pulse (10 to 100 us) capabilities. These lower power PRPC systems may be suitable for medical Linacs and mobile RF systems. This paper will briefly review the performance achieved for the SNS accelerator and examine designs for high efficiency megawatt class CW systems and 30 MW peak power applications. The devices and designs for compact higher frequency converters utilized for short pulse, lower average power applications will also be presented.« less
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7]
  1. (William A.)
  2. (David M.)
  3. (Joseph T.), III
  4. (Thomas W.)
  5. (Sung-Il)
  6. (Michael T.)
  7. (Daniel E.)
Publication Date:
OSTI Identifier:
977650
Report Number(s):
LA-UR-04-3480
TRN: US1003658
Resource Type:
Conference
Resource Relation:
Conference: Submitted to: IEEE Power Modulator Conference 2004, San Francisco, CA, May 23-26, 2004
Research Org:
Los Alamos National Laboratory
Sponsoring Org:
DOE
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ACCELERATORS; AMPLIFIERS; DESIGN; EFFICIENCY; FREQUENCY CONVERTERS; KLYSTRONS; LINEAR ACCELERATORS; NEUTRON SOURCES; PEAK LOAD; PERFORMANCE; POWER CONDITIONING CIRCUITS; POWER SYSTEMS; RESONANCE; RF SYSTEMS; SPALLATION; TOPOLOGY; TRANSFORMERS