Fig. 2: Electrical output and energy management characteristics of the H-TENG array.
From: Raindrop energy-powered autonomous wireless hyetometer based on liquid–solid contact electrification
a Schematic diagram of the H-TENG array (M × N). The following data are measured at a rainfall intensity of 71 mm/min if not specified. b Open-circuit voltage waveforms of the H-TENG units in series (N = 1). c Relationship between the open-circuit voltage and M (N = 1). d Short-circuit current waveforms of the H-TENG groups in parallel (M = 12). e Relationship between the short-circuit current and N (M = 12). f Output power of the H-TENG with different resistances (M = 12; N = 30, 60, 90). g Schematic circuit diagram of the EMM for the H-TENG. h Voltage waveform of the H-TENG with the EMM (C2 = 15 mF). i Charging characteristics of different capacitors (C2). j The storage and regulation voltage waveforms of the EMM with 1 MΩ load resistance. k Charging time for a 15 mF capacitor to 3.3 V with different rainfall intensity rates
