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Development of µHV miniature HV supplies

Development of µHV miniature HV supplies. Harry van der Graaf, Henk Groenstege, Fred Hartjes and Jaap Kuijt. RD51 Collaboration Meeting Kolympari, Crete, Greece, 16-17 June 2009. Concept. Putting dedicated HV units in the vicinity of a detector

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Development of µHV miniature HV supplies

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  1. Development of µHVminiature HV supplies Harry van der Graaf, Henk Groenstege, Fred Hartjes and Jaap Kuijt RD51 Collaboration Meeting Kolympari, Crete, Greece, 16-17 June 2009

  2. Concept • Putting dedicated HV units in the vicinity of a detector • Commercially available HV supplies are not suited for this • Often too bulky • May use iron based transformers • => do not operate in a magnetic field • Not radhard • Designed to deliver substantial power (1 W or more) where powers in the mW region are needed • Mostly no trip level in the nA region • Need for dedicated HV supplies in HEP • As small as possible • Limited output power • 5 mW for MPGDs and diamond • Up to few 100 mW for silicon • => two different versions have to be made • Small input power (< few mW without output power) • Ranging from 400 to ~ 1000V • Very radhard (until 1 Grad, 107Gy) • Minimal noise emittance • Output voltage stabilization, low ripple • High resolution current measurement (< 1 nA resolution) • Trip level in the nA region • External communication via CAN bus

  3. Creating HV with Cockroft-Walton circuit Voltage feedback Block pulses in (duty cycle modulation) No transformer Voltage divider feedback for stabilisation

  4. Measurement output current ADC To PCI interface Using inductive DC-DC converters Analogue current digitized

  5. Cockroft-Walton supply 100 kHz HV-stage-in PCI interface • Control by PCI-bus • Voltage control by regulating duty cycle at output stage • Need to regulate +50V supply (amplitude block pulse) as well Voltage feedback

  6. Regulating block pulse amplitude Only simulated

  7. Not miniature yet Presently 38 x 52 mm PCB To be treated with Parylene (moisture barrier)

  8. Status Cockroft Walton circuit CAN interface • Project just started up • Regulation 50V supply to be implemented • Miniaturize components • Radhard

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