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Is the PV inverter too hot? You need to dissipate it!

As the core of the photovoltaic power station, the inverter affects the normal operation of the entire power station, and the heat dissipation performance of the inverter has the greatest impact on the life of the device. How much do you know about the heat dissipation of photovoltaic inverters? Today, the baby is talking about the heat dissipation of the inverter.

Why should an inverter dissipate heat?
 
The components in the inverter have a rated operating temperature. If the heat dissipation performance of the inverter is relatively poor, when the inverter continues to work, the heat of the components is always collected inside the cavity, and the temperature thereof is getting higher and higher. Excessive temperatures can degrade component performance and life, and machines can easily fail.
 
When the inverter is hot during operation, power loss is unavoidable. For example, an inverter of 5 kW has a system heat loss of about 75-125 W, which affects the amount of power generation. An optimized thermal design is required to reduce heat dissipation.

Two inverter cooling method
 
Natural heat dissipation:
 
Natural heat dissipation means that no external auxiliary energy is used to dissipate the local heating device to the surrounding environment, thereby achieving temperature control, and the natural heat dissipation is suitable for low-power devices that do not require high temperature control.

Forced air cooling
 
The cooling method of forced cooling is mainly a method of taking away the heat emitted by the device by means of a fan. At present, the material of the radiator is mainly aluminum or copper.
 
Third, how to choose the appropriate heat dissipation method In general, the allowable operating temperature of the electronic device is between 40-60 °C. In the case of a temperature rise of 60 ° C, natural cooling can withstand a heat flux density of 0.05 W/cm 2 at the maximum. When the heat flux density is greater than 0.05 W/cm2, the forced air cooling method is a good choice on the economic and performance level. If the heat flux density continues to increase, other heat dissipation methods such as liquid cooling are required.

Four latest cooling technologies
 
With the continuous development of electronic technology, inverters have achieved great development in heat dissipation:
 
Sub-chamber management:
 
The most susceptible devices in the inverter are op amps, sensors, electrolytic capacitors, etc. Inductors, cables, power switch tubes, etc. are relatively high temperature resistant, and the components that are heated can be separated by a cavity method to heat the device. For example, the inductor is placed outside the inverter to reduce the temperature inside the chassis. At the same time, the integral shell structure can be adopted, and the heat sink and the outer shell are directly closely connected, so that the aluminum alloy shell can be dissipated through two paths, thereby reducing the component temperature and the internal temperature of the inverter, and ensuring components and counters. The transformer has a longer service life.
 
Thermal simulation technology:
 
The simulation software can simulate the thermal condition of the system more realistically, and the working temperature value of each component can be predicted in the design process, so that the unreasonable inverter structure layout can be corrected, thereby shortening the design development cycle and reducing Cost, improve the success rate of the product.

New heat sink application:
 
For example, steel radiators, aluminum alloy radiators, copper radiators, copper-aluminum composite radiators, steel-aluminum composite radiators, stainless steel radiators, etc.
 
New heat pipe cooling technology:
 
The heat pipe is a new type of heat transfer element with extremely high thermal conductivity. It transfers heat by evaporation and condensation of liquid in a fully enclosed vacuum tube. It uses a fluid principle such as a sucking action to achieve a good cooling effect. It has extremely high thermal conductivity, good isothermality, and the heat transfer area on both sides of the hot and cold can be arbitrarily changed, long-distance heat transfer, and temperature controllable.

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