Switch-Mode Power

Zero Voltage Switching – Switched Capacitor Converter Topology

Technology advances and the demands being placed on high power Artificial Intelligence data centers are stretching the boundaries of the existing power solutions. Increasingly sophisticated power solutions are driving a rapidly increasing demand for highly efficient, resonant power supplies.

These, in turn, require complex Printed Circuit Board (PCB) designs, components with extremely tight tolerances, and other high-cost solutions.

Infineon Technologies’ AG answer to this design challenge is the Zero Voltage Switching (ZVS) Switched Capacitor Converter topology. This new topology approach offers best-in-class performance, efficiency, and power density at a lower cost than existing solutions.

A single ZVS Switched Capacitor Converter design can deliver up to 1kW, and is well suited for advanced server and GPU applications that use 48V to 60V inputs. Target applications include:

  • Server and storage
  • Telecom
  • Datacom

The ZVS Switched Capacitor Converter topology uses capacitive energy transfer to generate an intermediate bus voltage. This feeds the multi-phase buck regulators that power up CPUs, GPUs, ASICs, SoCs, and memory. The ZVS inductor (LZVS) always guarantees soft switching by providing a discharge path for all MOSFETs prior to turn-on. This ensures that the efficiency of the converter is independent of the resonant capacitor and inductor tolerance (LR1 and LR2).

Key features and benefits:

  • Best-in-class efficiency/power density with ZVS SCC
  • Immune to component tolerances
  • Better utilization of PCB area due to elimination of “external” resonant inductors
  • Reduced overall solution cost
  • Single ZVS Switched Capacitor Converter design can deliver up to 1 kW

All components used in the Zero Voltage Switching (ZVS) Switched Capacitor Converter solution are readily available from Infineon.

(click on image to enlarge)

Infineon Technologies AG
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