Patent ID: 11909224
Assignee: WI-CHARGE LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 1:
2. A power converting device for converting optical power into electrical power adapted for optical wireless power transmission using a laser beam, comprising:
a power converting device having at least one junction having a bandgap energy between 0.75 eV and 1.2 eV, and having an external layer through which laser light is transmitted towards said at least one junction, said external layer being configured to transmit at least a first wavelength into said at least one junction with at least 80% efficiency when illuminated through said external layer from any direction between ±20° to the normal to the surface of said external layer; wherein at least one of:
the conversion efficiency of said power converting device for said first wavelength being at least 30%, said first wavelength being a near infra-red wavelength between 700 nm and 1500 nm;
said power converting device external layer being configured to reflect or absorb a portion of incident illumination at a second wavelength between 550 nm and 700 nm, so that less than 60% of the illumination at said second wavelength reaches the at least one junction when illuminated through said external layer from any direction between ±20° to the normal to the surface of said external layer and said power converting device conversion efficiency for said second wavelength is at below 20%;
said power converting device external layer being configured to absorb or reflect at least a third wavelength between 300 nm and 550 nm, so that at least 50% of the power of said third wavelength is absorbed or reflected before reaching said at least one junction, when illuminated through said external layer from any direction between ±20° to the normal to the surface of said external layer, and said power converting device conversion efficiency for said third wavelength being less than 10%; and
said power converting device conversion efficiency for a fourth wavelength between 1500 nm and 2000 nm being below 5%.