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Photovoltaic cell for laser beam power detection

A technology of photovoltaic cells and laser beams, applied in photovoltaic power generation, photovoltaic modules, circuits, etc., can solve problems such as options for recycling reflected light that are not mentioned

Pending Publication Date: 2022-01-07
WI CHARGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While different options for increasing light trapping in cells are discussed, options for recycling reflected light are not mentioned

Method used

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  • Photovoltaic cell for laser beam power detection
  • Photovoltaic cell for laser beam power detection
  • Photovoltaic cell for laser beam power detection

Examples

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Embodiment Construction

[0152] Reference is now made to FIG. 1, which schematically illustrates a typical structure of a photovoltaic cell made of a p-type semiconductor 13 attached to an n-type semiconductor 11, or sometimes with The n-type semiconductors 11 are in close proximity but are still separated by another layer, forming a p-n junction 12 . Full metal contacts are on the back of the cells 14 and partial metal contacts 15 in the form of a grid (or similar structure) are on the front of the cells, allowing light to penetrate the spaces between the conductors. The incident radiation generates a current 16 through the load.

[0153]now refer to figure 2 , which schematically shows the first two orders of Bragg reflection of an incident beam 23 on a prior art rectangular grid photovoltaic cell 21 . The incoming light beam 23 strikes the metal grid 22 of the photovoltaic cell 21, about 2-10% of the power in the light beam 21 is reflected by the conductor grid 22 in a Bragg pattern comprising se...

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Abstract

A wireless optical power transmission system comprising a transmitter and receiver, the transmitter comprising a laser emitting a beam, a scanning mirror for steering the beam towards said receiver and a control unit receiving signals from a detection unit on the receiver and controlling the beam power and the scanning mirror. The receiver has a photovoltaic cell having a bandgap energy of 0.75-1.2 eV, with a plurality of conductors on a beam receiving surface. A cover layer of material blocking illumination of wavelengths outside that of the laser, is disposed on the photovoltaic cell. The cover layer may have anti-reflective coatings on its top and bottom surfaces. The detection unit thus generates a signal representing the power of the laser beam impinging upon the receiver, independent of illuminations other than that of said laser beam. The control unit thus can maintain the laser power impinging on the receiver.

Description

technical field [0001] The present invention relates to the field of photovoltaic cells, in particular to photovoltaic cells suitable for converting light beams from laser power sources into electrical energy in wireless power systems. Background technique [0002] Photovoltaic cells (known as PV cells) are designed and used in many systems to convert light (visible or invisible) into electrical energy. In wireless power systems, photovoltaic cells are used to convert laser light directed at the battery from a transmitter into usable electricity. In such systems, it is important to accurately measure the power received by the battery for a number of reasons (e.g., to maintain proper aiming of the beam, to maintain safe operation of the system, and to efficiently convert the power generated by the photovoltaic cell into usable, stable electrical power). The amount of laser light is important. [0003] In a typical photovoltaic cell, one or more p-n junctions are used to con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J50/30H01L31/0352
CPCH02J50/30H01L31/0547H01L31/02168Y02E10/52H02S40/30
Inventor O·阿尔珀特O·R·莫尔L·戈朗R·萨基E·孔福尔蒂
Owner WI CHARGE