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Capacitors

Breakthrough in AC-DC Conversion: Dyson Technology Patent

Strategic Insights

— 1 min read

Dyson Technology Limited, a renowned company from the United Kingdom, has made a significant breakthrough in the field of AC-DC conversion with the issuance of patent number 12431804. This patent, filed on November 15, 2021, and published online on September 30, 2025, marks a crucial milestone in the development of efficient and compact power conversion systems. The patent's inventor, Stephen Greetham, has designed a novel buck-boost converter that provides AC-to-DC conversion without the need for a rectifier bridge or front-end bulk capacitor.

Key Takeaways:

  • The patented buck-boost converter comprises input terminals, output terminals, a first group of devices, and a second group of devices, each with a first switch, a second switch, and a third switch or diode connected in series.
  • The converter uses a unique topology that enables AC-to-DC conversion using just six devices, an inductor, and a capacitor.
  • The controller configures the switches in two distinct configurations: (i) energizing the inductor by the power supply, and (ii) transferring energy stored in the inductor to the capacitor.
  • The controller switches the first switches at a lower frequency than the second switches, which is beneficial for controlling the first switches, which require an OFF state in which they do not conduct in either direction.
  • The patented converter is more efficient and has a simpler topology compared to other bridgeless buck-boost converters.

Statistics:

  • Patent number: 12431804
  • File date: November 15, 2021
  • Publication date: September 30, 2025
  • Number of devices: 6 (six switches, or four switches and two diodes)
  • Inductors: 1
  • Capacitors: 1

Sources:

  • Wright, W. (2025, September 30). AC-DC buck-boost converter. U.S. Patent Number 12431804.
  • Greetham, Stephen. (2021, November 15). AC-DC buck-boost converter. Patent URL: https://ppubs.uspto.gov/pubwebapp/external.html?q=(12431804)&db=USPAT&type=ids

Note: The sources listed above are exactly as mentioned in the original text. The URL provided is for additional information on the patent.

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