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Benchmarking Capacitor Charging Efficiency
| Ref. | VC(V) | VDD(V) | ICS(mA) | ηACDC(%)* | ηDCDC(%) | ηCHG(%)** | ηCAP(%)*** |
|---|---|---|---|---|---|---|---|
| [8] | 0~4.2 | 4.3 | 3 | 80 | - | 48.8 | 39 |
| [9] | 0~4.2 | VC+0.2 | 800 | 80 | 90 | 91.3 | 65.7 |
| [10] | 0~4.2 | VC+0.3 | 698 | 80 | - | 87.5 | 70 |
| This work | 0~±2 | 2.7VPeakAC (Vcoil) | 34 (max) | Not needed | - | 82 | 82 |
Power efficiency of the active rectifier in [7]
Charger efficiency, ηCHG = avg (VC / VDD)
ηCAP = ηACDC × ηDCDC × ηCHG.
