Deterministic Sub-Cycle Phase-Shift Full-Bridge Power Conversion via FPGA Silicon Acceleration

Deterministic Sub-Cycle Phase-Shift Full-Bridge Power Conversion via FPGA Silicon Acceleration Technical White Paper ID: QN-PSFB-2026-V1.0Published by: QuantNature Publication Date: September 3, 2026 1. Executive Summary Conventional digital power conversion architectures relying on Digital Signal Processors are constrained by sequential software interrupt latencies (~5.000 µs / 5,000 ns). Under aggressive load transients, this control lag triggers phase-angle hunting, severe output voltage droop, and instantaneous loss of Zero-Voltage Switching (ZVS), inducing high thermal dissipation and semiconductor stress. This technical report formalizes and empirically validates a deterministic sub-cycle Phase-Shift Full-Bridge power conversion architecture executed on a proprietary FPGA silicon engine deployed on the AMD/Xilinx Zynq-7000 SoC (PYNQ-Z2). Synchronized with a high-fidelity 25 ns digital twin plant under 3S Li-ion charging specifications (V_target = 12.60 V, 100.00 kHz carrier), the system achieves true sub-cycle phase modulation and continuous ZVS locking. 2. Verified Hardware-in-the-Loop Empirical Findings Benchmarked across 100,000 continuous time-domain evaluation steps under a violent 1.00 A → 5.00 A load step transient, real-time HIL telemetry confirms the following quantitative breakthroughs: Sub-Cycle Control Determinism (25 ns Latency): Achieves a closed-loop execution latency of 0.025 µs (25 ns), delivering a 200× acceleration over standard DSP baselines and eliminating phase hunting. Dynamic Transient Voltage Rigidity: Suppresses transient voltage sag to 11.92 V (a 50.7% sag reduction compared to 11.22 V on DSP) and achieves critically damped asymptotic recovery to 12.60 V within 135.50 µs (>11× faster settling). Thermal Dissipation Elimination (64.5% Cut): Continuous ZVS boundary locking clamps peak switching dissipation from 5.68 W down to 2.01 W (a 64.5% net thermal loss cut / factor of 1/2.8), enabling completely fanless, ultra-compact passive form factors. Ultra-High Conversion Efficiency (98.2%): Delivers a verified full-load average conversion efficiency of 98.2% (a +4.2%p absolute gain over the 94.0% DSP baseline). 3. System Architecture & Benchmark Specifications Silicon Host: AMD/Xilinx Zynq-7000 SoC (XC7Z020) on PYNQ-Z2 running at a physical 40.00 MHz base clock (T_clk = 25.0 ns). Switching Topology: Phase-Shift Full-Bridge (ZVS Synchronous Conversion). Operating Frequency: 100.00 kHz carrier frequency (Switching period T_sw = 10.00 µs). DC Bus Levels: Input V_in = 20.00 V (USB-PD 65W profile) → Regulated V_out = 12.60 V (3S Li-ion spec). Passive Filtering: 10.0 µH Sendust toroidal inductor + 220.0 µF low-ESR electrolytic capacitor. This white paper is licensed under CC BY 4.0. Note that this license applies solely to the published text, diagrams, and telemetry data, and does not grant rights to any underlying RTL code, hardware implementations, or proprietary IP.