Author Affiliations
Department of Electronic Engineering, Kyungsung University, Nam-Gu, Busan 48434, South Koreashow less
Fig. 1. Classification of current wireless power transfer technologies.
Fig. 2. General block diagram of the OWPT.
Fig. 3. Block diagram and picture of the experimental setup.
Fig. 4. E/O conversion efficiency and optical output power of (a) a 200 mW LD and (b) a 500 mW LD.
Fig. 5. Voltage-current graphs of the (a) PV cell and (b) PD by changing the load resistance when the 200 mW LD is operating at the maximum E/O conversion condition.
Fig. 6. Voltage-current graphs of the (a) PV cell and (b) PD by changing the load resistance when the 500 mW LD is operating at the maximum E/O conversion condition.
Fig. 7. E/O conversion efficiency of the LD, the O/E conversion efficiency of the optical power receiver, and the total OWPT efficiency as functions of the optical output power of the LD for the following OWPT systems: (a) 200 mW LD and PV cell, (b) 200 mW LD and PD, (c) 500 mW LD and PV cell, and (d) 500 mW LD and PD. The point marked by the arrow in each figure is the point where the E/O conversion efficiency of the LD is the maximum.
Parameter | Type of LD |
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200 mW | 500 mW |
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Wavelength (nm) | 850.8 | 850.3 | Electric current (mA) | 414 | 629 | Electric voltage (V) | 2.60 | 6.01 | Optical output power (mW) | 298 | 694 | E/O conversion efficiency (%) | 27.8 | 18.4 |
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Table 1. Operating Condition of the LDs at the Maximum E/O Conversion Efficiency
Optical power transmitter | (%) | Optical power receiver | (%) | |
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200 mW LD | 27.8 | PV cell | 11.93 | 3.32 | PD | 8.04 | 2.23 | 500 mW LD | 18.4 | PV cell | 11.96 | 2.20 | PD | 6.84 | 1.26 |
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Table 2. OWPT Efficiency When the Optical Power Transmitter Was Operating at the Maximum E/O Conversion Efficiency
Optical power transmitter | (%) | Optical power receiver | (%) | |
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200 mW LD | 26.1 | PV cell | 12.96 | 3.39 | 27.8 | PD | 8.04 | 2.23 | 500 mW LD | 13.7 | PV cell | 18.8 | 2.57 | 13.2 | PD | 14.1 | 1.86 |
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Table 3. Maximum OWPT Efficiency After the Whole System Optimization