• Y.-H. Liu, J.-C. Chang, C.-Y. Liu
  NSRRC, Hsinchu

The pur­pose of this paper is to es­ti­mate the con­duc­tive Elec­tro­mag­net­ic In­ter­fer­ence (EMI) from mag­net power sup­ply in NSRRC. A LISN sys­tem was con­duct­ed to mea­sure the EMI spec­trum of power sup­ply. The dif­fer­ent fre­quen­cy range of con­duc­tive EMI was mea­sured. For the fu­ture TPS(Tai­wan Pho­ton Source) power sup­ply de­sign, the EMI sig­nals must be lower than TLS kick­er. There­fore re­duc­ing and elim­i­nat­ing the in­ter­fer­ence of elec­tro­mag­net­ic waves will be a very im­por­tant issue. A fil­ter and shield­ing method were used to test the ef­fects of re­duc­ing EMI. The EMI pre­ven­tion scheme will be used in the fu­ture.

• 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.