2025 年 22 巻 19 号 p. 20250386
Perovskite solar cells (PSCs) suffer output efficiency degradation during indoor low light operation (100 lux) due to dynamic internal resistance. This work proposes a constant voltage reference method (CV-RM) with dynamic impedance matching, enabling wide-illuminance Maximum Power Point Tracking (MPPT) via frequency-impedance co-regulation. Characterization establishes optimal voltage ratio K = 0.8. A digitally tuned oscillator adapts charge pump frequency (0.11-2.58 MHz) to match PSCs resistance. The all-analog design achieves MPP voltage locking, eliminating ADCs and digital processing. Experiments demonstrate: 100 lux cold start, full-range coverage (100-1000 lux), and cost reduction for billion-scale IoT deployments.
