Design Principles of Solar Photovoltaic Power Generation

1. The principle of solar photovoltaic power generation: Solar photovoltaic power generation relies on solar cell components and uses the electronic characteristics of semiconductor materials. When sunlight shines on the semiconductor PN junction, the P-N junction barrier area generates a strong built-in electrostatic field. , so the non-equilibrium electrons and holes generated in the barrier region or the non-equilibrium electrons and holes generated outside the barrier region but dispersed into the barrier region move in opposite directions under the effect of the built-in electrostatic field. , separates the barrier region, resulting in a drop in the potential of the P region and a drop in the potential of the N region, and then a voltage and current are generated in the external circuit to convert the light energy into electrical energy. Solar photovoltaic power generation chips can be roughly divided into two categories, one is grid-connected power generation chips, that is, connected to the shared power grid through a standard interface, like a small power plant; the other is independent power generation chips, that is Form a circuit outside of my closed circuit. The grid-connected power generation chips pass through the photovoltaic array and convert the received solar radiation energy into high-voltage direct current through high-frequency direct current. The independent power generation chip fine photovoltaic array will first directly convert the received solar radiation energy into electrical energy to supply the load, and store the excess energy in the battery in the form of chemical energy after passing through the charge controller. 2. Advantages of LED lighting: In addition to the advantages of long service life, high luminous power, small size, light weight, environmental protection, safety and reliability, LED semiconductor lighting source has another obvious advantage because the LED starting voltage and working voltage are different. So no need to use ballast. In this way, while saving cost and energy consumption, it also greatly prolongs the response time of power-on and power-off. The key to the complete combination of solar photovoltaic power generation technology and LED lighting is that both are direct current, low voltage and can be matched with each other. Therefore, the combination of the two does not need to convert the direct current generated by the solar cell into alternating current, thus greatly improving the power of the entire lighting chip. At the same time, with the help of grid-connected technology or the use of battery charging and discharging energy, the disadvantage is more obvious. With the in-depth study of related technologies, the luminous power of LEDs is constantly improving, and ultra-high-brightness LEDs are about to appear, which is bound to replace the general lighting electric light source, and a few waste power and have no purification. Because the working current of LED is DC, and the working voltage is low. Solar cells convert light energy into DC power, and solar cell elements can be combined in series and parallel to obtain the actual required voltage. These features are precisely matched with LEDs, and the combination of the two will achieve high power utilization, high safety performance and reliability, and achieve energy-saving, environmentally friendly, safe, and efficient lighting chips, resulting in a very perfect combination.