31results about How to "Solve the low conversion efficiency" patented technology

The utility model relates to an independent photovoltaic power generation railway power supply control system. In railway electric equipment, there are a large impact load, a communication signal high stability load and other equipment with a special electric demand. Solar photovoltaic power generation is greatly influenced by an environment. In a photovoltaic power generation system, problems that solar energy conversion efficiency is low and power supply system power is insufficient generally exist. The system collects sun radiation energy and converts into direct-current electric energy. After conversion, charging is performed on a storage battery. A direct current is converted into an alternating current so that a load can use the alternating current. Load working voltage current information monitored by a working state collector and environment information monitored by an environment illumination collector and an environment temperature collector are transmitted to an energy storage system controller. After logic processing, control to a charging conversion module and an inversion conversion module is performed. According to a railway load operation state and an environment state, continuous and smooth electric energy is adjusted, controlled and output; photovoltaic power generation power quality and efficiency are increased and continuous stability of power supply transmission is guaranteed.

The invention provides an n type silicon solar cell and a preparation method therefor. The n type silicon solar cell comprises an n type silicon substrate, wherein a p type doped layer, a front surface passivating layer and an anti-reflection layer are manufactured on the front surface of the n type silicon substrate from the bottom up in sequence; the front surface passivating layer is a monox or silicon nitride film layer; a front surface electrode is manufactured by penetrating the anti-reflection layer and the front surface passivating layer; the front surface electrode is connected with the p type doped layer; an n+ doped layer is formed on the back surface of the n type silicon substrate through a doping manner; a back surface passivating layer is manufactured on the n+ doped layer; the back surface passivating layer comprises a film layer prepared from a ferroelectric film material or a doped ferroelectric film material; a full-back metal film is manufactured on the back surface passivating layer; and a back surface electrode of the cell is formed by the full-back metal film. According to the n type silicon solar cell, the ferroelectric film material is adopted as the main raw material of the back surface passivating layer of the cell, so that the open-circuit voltage, the short-circuit current and the fill factor of the cell can be well improved, and the conversion efficiency of the cell can be improved.

The embodiment of the present invention discloses a multi-antenna energy transmission device, method and device, including a sending device and a receiving device, the sending device includes a plurality of sending antennas; the receiving device includes a plurality of receiving antennas, a plurality of rectifiers and a power splitter ; The sending device formulates an energy beamforming scheme and an energy split coefficient according to the parameter information, and transmits radio frequency energy to the receiving device according to the energy beamforming scheme, and transmits the energy splitting coefficient to the receiving device at the same time. Each receiving antenna in the receiving device can transmit the received RF energy to the corresponding power splitter; each power splitter is connected to the corresponding rectifier, and can adaptively split the RF energy collected by the receiving antenna according to the energy split coefficient processing, so as to ensure that the radio frequency energy transmitted to each rectifier is within an appropriate range, effectively solving the problem that the rectifier is limited by the initial voltage and saturation voltage, resulting in low energy conversion efficiency, and improving the conversion efficiency of radio frequency energy.