Photovoltaic inverter hitaleiðni

    As a power electronic equipment, photovoltaic inverter, like all electronic products, faces the challenge of temperature. In all failure cases of electronic products, up to 55 percent of them are caused by temperature.

    The electronic components inside the inverter are also very sensitive to temperature. According to the 10 degree rule of reliability theory, the service life will be halved for every 10 degree increase in temperature from the room temperature, so the heat dissipation design of the inverter is very important.

     The heat dissipation system of photovoltaic inverter mainly includes radiator, cooling fan, thermal conductive silicone grease and other materials. At present, there are two main heat dissipation modes of photovoltaic inverter: natural cooling and forced air cooling.

Náttúruleg kæling:

     Natural cooling refers to the realization of local heating devices to dissipate heat to the surrounding environment to achieve the purpose of temperature control without using any external auxiliary energy. It usually includes three main heat transfer modes: heat conduction, convection and radiation, in which natural convection is the main mode of convection.

     Natural heat dissipation or cooling is often applicable to low-power devices and components with low requirements for temperature control and low heat flux of device heating. Generally, most three-phase inverters below 20kW adopt natural cooling.

Þvinguð loftkæling:

    Forced air cooling is mainly a method of forcing the air around the device with the help of fans to take away the heat emitted by the device The method of improving the forced convection heat transfer capacity increases the heat dissipation area and produces a relatively large forced convection heat transfer coefficient on the heat dissipation surface. Increasing the heat dissipation area of the radiator surface to enhance the heat dissipation of electronic components has been widely used in thermal design.

      In addition, the thermal condition of the system can be truly simulated by using the simulation software, and the working temperature value of each component can be predicted in the design process. In this way, the unreasonable inverter structure layout can be corrected, so as to shorten the design R D cycle, reduce the cost and improve the primary success rate of the product.