Y. Unno, 2009/2/241 Status of Piezo-Transformer DC-DC Converters Y. Unno (KEK) M. Imori, Y. Kanada (U. Tokyo) S. Imada (NF KK) M. Katsuno (NEC-Tokin KK)

Y. Unno, 2009/2/242 Power Supplies with PET Piezo-Electric Transformer (PET) InputOutput PE ceramics Inner elecrode (Perfect) Transformer ratio is Advantages of PET: Non-magnetic Radiation tolerant Isolation of primary and secondary

Y. Unno, 2009/2/243 Development of HV Power Supply Status –HV (Step-up PET) 1 kV mA Evaluating with existing Step-up PET and power supply board

Y. Unno, 2009/2/244 Step-up HV PET Evaluation Demonstrated! –1 kV - 5 mA –with existing PET Issues –Loss –Ripple New optimized PET to come

Y. Unno, 2009/2/245 Development of LV Power Supply LV (Step-down PET) –Goal: 2V - 4 A –New fabrication of compact Step-down PET 14 mm x 14 mm x 4 mm –Power supply test board has been fabricated

Y. Unno, 2009/2/246 Step-down LV PET Demonstrated! –2V - 4A –Drive voltage: 48 V PET Efficiency ~80% –excluding drive circuit power

Y. Unno, 2009/2/247 Summary Step-up HV PET power supply –1 kV - 5 mA achieved –Issues identified A compact Step-down LV PET is fabricated –2 V - 4 A achieved –PET efficiency ~80%

Y. Unno, 2009/2/248 Backup

Y. Unno, 2009/2/249 High Voltage Power Supply Incorporating Piezoelectric Transformer Masatosi Imori, Yoshinobu Unno 1, Yasumasa Kanada 2, Satoru Imada 3 and Masafumi Katsuno 4 ICEPP, University of Tokyo, Hongo, Bunkyo-ku Tokyo ,Japan 1 KEK, 1-1 Oho, Tsukuba, Ibaraki Japan 2 Information Technology Center, University of Tokyo, Yayoi, Bunkyo-ku Tokyo , Japan 3 NF Corporation, Tsunashima Higashi, Kohoku-ku, Yokohama-shi , Japan 4 NEC TOKIN Corporation, 7-1, Kohriyama 6-chome, Taihaku-ku, Sendai-shi, , Japan

Y. Unno, 2009/2/2410 Commercial Product - Example 60 independent channels of HV power supply are housed in 2U x 19 ’’ EURO crate x 50 cm in depth –Each board contains 3 ch. of HV power supply –The system consists of 20 HV boards & a control board A piezoelectric transformer (PT) generates high voltage

Y. Unno, 2009/2/2411 Commercial Product (cont'd) output capability –4 kV 100  A with ripples less than 100 mV in peak-to-peak voltage –Capable of driving 10 M  up to 4 kV magnetic field tolerance – Working under the magnetic field of 1 Tesla Radiation Hardness –60 MeV protons ; 1E11 (~14krad) [tested at PSI ] –Cobalt-60 gamma-ray ; ~300krad the system cope with both conditions

Y. Unno, 2009/2/2412 Issues to Apply SCT Output capacity –1 kV-5 mA, -10 mA? Ground isolation Regulation of output voltage Radiation tolerance –if HV units are to be placed near the inner detector, e.g., outside the calorimeter

Y. Unno, 2009/2/2413 Piezoelectric HV Transformer Max. efficiency –  x C d2 x Ｚ out to be1 –  =1/sqrt(L 1 *(C 1 +C d1 )),... Mostly a few W range –E.g., 5W = 1 kV * 5 mA

Y. Unno, 2009/2/2414 Sharing Common Ground The PT used in the power supply shares the common ground between the primary and the secondary Potential Difference Current

Y. Unno, 2009/2/2415 Ground Isolation How to power the monitoring circuitries –With/Without floating voltage sources –Isolation couplers Large Impedance