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Batteries

Innovative DC Fast Charger Design for Electric Vehicles

Strategic Insights

— 1 min read

Electric vehicles, also known as EVs, rely on complex systems for efficient charging. Brian C. Wightman, the inventor, has filed a patent application for a groundbreaking direct current (DC) fast charger design. The charger, intended to facilitate the charging of EV batteries, features a primary circuit with nine switching groups and a secondary circuit with six switches or diodes. This design enables the charger to directly couple with an electrical grid and rectify AC power into DC power. The primary and secondary circuits are configured in various orientations, including Wye-Wye, Delta-Delta, and Delta-Wye, to optimize performance.

Key Takeaways:

  • The patent application details a DC fast charger design that includes a primary circuit with nine switching groups, each having a plurality of switches electrically connected in series.
  • The secondary circuit consists of six switches or diodes arranged to rectify AC power into DC power.
  • The charger is configured to directly couple with an electrical grid to receive three-phase AC power and increase its frequency.
  • The primary circuit and secondary circuit are configured in various orientations to optimize performance, including Wye-Wye, Delta-Delta, and Delta-Wye.
  • The charger includes a microprocessor electrically linked to the plurality of switches within each switching group.
  • The primary circuit has a plurality of bi-directional switches.
  • The charger includes a single three-phase transformer in some implementations.

Statistics:

  • Nine switching groups are included in the primary circuit.
  • Six switches or diodes are arranged in the secondary circuit to rectify AC power into DC power.
  • The charger is designed to increase the frequency of AC power received from the electrical grid.
  • The charger is intended to charge batteries of electric vehicles (EVs).
  • The patent application is U.S. Patent Application Number 20250253668.

Sources:

  • Wightman, B. C. Electrical Grid-Connected Three-Phase To Three-Phase Direct Matrix Converter. U.S. Patent Application Number 20250253668, filed February 7, 2024 and posted August 7, 2025.

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