• K.-B. Liu, K.T. Hsu, Y.D. Li, B.S. Wang
  NSRRC, Hsinchu
• J.C. Hsu
  CMS/ITRI, Hsinchu

Based on the re­quire­ment of beam sta­bil­i­ty for the third-gen­er­a­tion syn­chrotron ra­di­a­tion light source is more strin­gent, lower rip­ple and high­er band­width of out­put cur­rent of cor­rec­tor mag­net power con­vert­ers should be de­vel­oped to im­ple­ment the closed orbit cor­rec­tion of Tai­wan Photo Source (TPS). The ±10A/±50V cor­rec­tor mag­net power con­vert­er uses a full bridge con­fig­u­ra­tion, the switch­ing fre­quen­cy of power MOS­FET is 40 kHz, in that each bridge leg has its own in­de­pen­dent PWM con­troller and the out­put cur­rent band­width is 1 kHz when con­nect­ed with the cor­rec­tor mag­net load. Using a DCCT as the cur­rent feed­back com­po­nent the out­put cur­rent rip­ple of this con­vert­er could be lower than 5 ppm. In this paper, we will de­scribe the hard­ware struc­ture and con­trol method of the cor­rec­tor mag­net power con­vert­er and the test re­sults will be demon­strat­ed.

• C.-Y. Liu, Y.D. Li
  NSRRC, Hsinchu

We de­sign and im­ple­ment a power con­vert to sup­ply dc power bus for the MCOR30 cor­rec­tion sup­ply. The dc power sup­ply's char­ac­ter­is­tics were vari­able fre­quen­cy at heavy and medi­um/light load. These char­ac­ter­is­tics matched with the cor­rec­tion sup­ply work­ing re­quire­ment. The dc power bus has a re­lax­ation os­cil­la­tor gen­er­at­ing a sym­met­ri­cal tri­an­gu­lar wave­form, which MOS­FET's switch­ing is locked to. The fre­quen­cy of this wave­form is re­lat­ed to a cur­rent that will be mod­u­lat­ed by feed­back cir­cuit­ry. As a re­sult, the tank cir­cuit driv­en by half-bridge will be stim­u­lat­ed at a fre­quen­cy dic­tat­ed by the feed­back loop to keep the out­put volt­age reg­u­lat­ed, thus ex­ploit­ing its fre­quen­cy-de­pen­dent trans­fer char­ac­ter­is­tics. The high per­for­mance char­ac­ter­is­tics of the res­o­nant dc power bus are il­lus­trat­ed in this paper.

• K.-B. Liu, K.T. Hsu, Y.D. Li, B.S. Wang
  NSRRC, Hsinchu

The Tai­wan Pho­ton Source (TPS), a third-gen­er­a­tion syn­chrotron ra­di­a­tion light source, should be in­stalled with 1032 sets of mag­net power sup­plies for the stor­age ring and 152 sets for the in­jec­tor. All of the power sup­plies are pre­ferred in PWM switched mode with IGBT or MOS­FET. A high pre­ci­sion DC power sup­ply for 48 dipoles of the stor­age ring; there are 240 quadrupole mag­nets and 168 sex­tupole mag­nets in stor­age ring, the main wind­ing of quadrupole and 168 sex­tupole mag­nets are pow­ered by in­di­vid­u­al power sup­plies. In the boost­er ring, one set of dy­nam­ic power sup­ply for the dipole mag­nets and four sets for quadrupole mag­nets run at the bi­ased 3Hz quasi si­nu­soidal wave. There are sev­er­al hun­dred cor­rec­tor (fast and slow) mag­nets and skew quadrupole mag­nets in stor­age ring and in­jec­tor are pow­ered by the same bipo­lar power con­vert­ers.

• B.S. Wang, K.T. Hsu, Y.D. Li, K.-B. Lin, K.-B. Liu
  NSRRC, Hsinchu

This paper pre­sents an im­ple­men­ta­tion of a pre­ci­sion cor­rec­tor mag­net power con­vert­er using the dig­i­tal­ly con­trolled pulse width mod­u­la­tion method. The out­put cur­rent pre­ci­sion of this ±10A/±50V cor­rec­tor mag­net power con­vert­er is with­in ±10ppm. The dig­i­tal con­trol cir­cuit of the power con­vert­er is im­ple­ment­ed with using a high speed AD­S8382 18-bits ana­log-to-dig­i­tal con­vert­er and a TM­S320F28335 dig­i­tal sig­nal pro­ces­sor. The con­vert­er uses a full bridge con­fig­u­ra­tion, the switch­ing fre­quen­cy of power MOS­FET is 40 kHz and the con­trol res­o­lu­tion is 17-bits. Using a DCCT as the cur­rent feed­back com­po­nent the out­put cur­rent rip­ple of this con­vert­er could be lower than 5 ppm that is be­yond the re­quire­ment of TLS cor­rec­tor power con­vert­er and suit­able to be used in TPS.