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ケーススタディ: Inspection UAVs

Bi-directional converter shrinks battery array to one cell

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お客様の課題

New solid-state X-ray technology allows medical X-ray scanners to be more portable and battery operated, enabling medical professionals to check patients in any location. Medical X-rays typically need a short pulse of high-intensity radiation energy, which can conveniently be stored and supplied to the X-ray diode by a supercapacitor, in this case charged to 28V. Normally the 28V would be sourced from a number of Li-ion batteries in series. However, in a portable application, this type of battery array and charging system is too large and too heavy. The key goals were:

  • Find an alternative to heavy and bulky multiple-cell battery solutions
  • Fast charging of the supercapacitor requires a high current pulse
  • Long battery life to minimize the need for recharging
inspection UAV image

Vicorソリューション

Use of a bi-directional DC-DC converter reduced the battery array to just one 2.7V Li-ion cell, reducing size and weight significantly compared to a typical boost converter solution. In addition, the bi-directional converter delivered higher efficiencies when charging the supercapacitor from a low voltage source, extending battery life.

主な利点

主な利点

Ultra-small, lightweight solution (8.6cm2 footprint, 16g weight) compared to a boost converter solution

Ultra-small, lightweight solution (8.6cm2 footprint, 16g weight) compared to a boost converter solution

Unique bi-directional converters (DC-DC transformer) available as standard products

Unique bi-directional converters (DC-DC transformer) available as standard products

Higher efficiency achieved using low-loss Sine Amplitude Conversion topology

Higher efficiency achieved using low-loss Sine Amplitude Conversion topology

Bi-directional VTM, operating in reverse mode, enabled highly-efficient x12 transformation

A Vicor VTM, operating in reverse, stepped-up the 2.7V input to provide a nominal 32V rail with an efficiency of more than 94%. For the supercapacitor charging circuit, a ZVS Buck-Boost converter regulated the 32V and provided the necessary current limiting. This architecture was accomplished in a footprint of just 8.6cm2. To analyze this power chain, go to Vicor Whiteboard online tool.

Learn more about the modular approach power.

電力供給ネットワーク(PDN)

Vicor power delivery network for Inspection UAVs
VTM product family image

VTM カレントマルチプライヤ


絶縁 電圧変換比固定


入力電圧: 0 – 60V


出力電圧: 0 – 55V


出力電流: 最大115A


ピーク効率: 97%


22.83 x 8.52 x 4.9mm 他


ZVS 昇降圧レギュレータ


非絶縁 レギュレータ


入力電圧:  8-60V


出力電圧: 10-54V


出力電流: 最大150W(連続)


ピーク効率: 97%


10.5 x 14.5 x 3.05mm