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Currently, domestically produced X-ray tube high-voltage (HV) power supplies have exhibited excessive volume, making them unsuitable for portable applications. To meet the portability requirements of micro X-ray tubes, a compact, low-ripple, low-power HV power supply was designed, capable of generating an adjustable negative HV ranging from 0 to −50 kV with a power output of 5 W. The inverter section employed a push-pull converter circuit, while the voltage boost topology consisted of a high-frequency transformer and a voltage doubling rectifier circuit, to achieve the desired output through two-stage boosting. A PWM (Pulse Width Modulation) method was adopted, utilizing the SG3525 PWM chip to regulate the output voltage. A resistive voltage divider was used to sample the output HV for feedback, to enable closed-loop voltage stabilization control. Testing of the HV power supply showed an output ripple coefficient below 0.22% and a stability of 0.03% over 3 h, which meeting the operational requirements of micro X-ray tubes.

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Design of High Voltage Power Supply for Micro X-ray Tube

  • 会议论文

  • 发表日期：

    2026年

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  • Dexi Kong,
  • Dazheng Wang,
  • Bohua Yin,
  • Mingzhang Chu

摘要

Currently, domestically produced X-ray tube high-voltage (HV) power supplies have exhibited excessive volume, making them unsuitable for portable applications. To meet the portability requirements of micro X-ray tubes, a compact, low-ripple, low-power HV power supply was designed, capable of generating an adjustable negative HV ranging from 0 to −50 kV with a power output of 5 W. The inverter section employed a push-pull converter circuit, while the voltage boost topology consisted of a high-frequency transformer and a voltage doubling rectifier circuit, to achieve the desired output through two-stage boosting. A PWM (Pulse Width Modulation) method was adopted, utilizing the SG3525 PWM chip to regulate the output voltage. A resistive voltage divider was used to sample the output HV for feedback, to enable closed-loop voltage stabilization control. Testing of the HV power supply showed an output ripple coefficient below 0.22% and a stability of 0.03% over 3 h, which meeting the operational requirements of micro X-ray tubes.