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Comparison of typical type I and type II devices harvesting respiration energy
| Device type | Working mechanism | Operation locations | Output voltage by respiration (V) | Output current by respiration (μA) | Operation frequency (Hz) | Output power density range | References |
|---|---|---|---|---|---|---|---|
| Type I | Aerodynamic vibration | Face | 0.2‐45 | 0.5‐18 | Up to 600 | 0.6‐15 W/m2 | 64, 65, 66, 67 |
| Type II | Motion triggering | Chest, abdomen, diaphragm | 0.1‐20 | <0.3 | <2 | 0.076‐7.584 mW/m2 | 68, 69, 70, 71, 72, 73 |
