Speaker
Shouzhi Wang
(Department of Engineering Physics)
Description
A high voltage power supply (HVPS) used for the ECRH system on the SUNIST tokamak is introduced. It is able to output a 50 ms pulse of -40 kV / 15 A in every 5 minutes. The voltage drop for the whole flat top is less than 2%. In each arcing events, the maximum energy delivered to the load is less than 15 Joules.
The HVPS is based on Marx Generator and PSM technologies using fast switch elements (IGBT), which consists of 150 identical modules. Every module contains an electrolytic capacitor (10 mF / 450 V) for energy storage, an IGBT switch, an IGBT driver circuit, and other remote control circuits. Each module are self-powered. In other words, all the low power consumption electronic circuits, including the IGBT drive circuit and other remote control circuits get power from the electrolytic capacitor. This greatly simplified the design and lowered the cost. Each module are connected in the topology of Marx Generator, which means that all the 150 electrolytic capacitors can be charged in parallel using a normal low voltage (~ 400 V) power supply. The drive signals of IGBTs are delivered by optical fibers for fast response and high voltage insulation. The HVPS utilizes the control logic of PSM technologies, which can deliver user-defined waveforms to loads and keep the voltage drop of the flat-top less than 2% for a 50 ms pulse.
Co-authors
Chunhua Feng
(Institute of Physics, Chinese Academic of Science, Beijing, China)
Shouzhi Wang
(Department of Engineering Physics, Tsinghua University, Beijing, China)
Wenhao Wang
(Department of Engineering Physics, Tsinghua University, Beijing, China)
Yi Tan
(Department of Engineering Physics, Tsinghua University, Beijing, China)
Zhe Gao
(Department of Engineering Physics, Tsinghua University, Beijing, China)
