Inverter Improve Work And Service Life

Inverter in the components have their rated operating temperature, if the inverter thermal performance is poor, as the inverter continues to work, the heat of the components can not be transmitted to the outside world, its temperature will be higher and high. High temperature will reduce the performance and life of components, in order to maintain the inverter internal components operating temperature within the rated temperature range, to ensure its effectiveness and service life, it is necessary to heat conduction materials to the inverter internal heat transfer out,

From the heat conduction point of view, the more balanced the internal and external temperature of the inverter, that is, the interior heating components and radiator, shell temperature closer, the better the thermal conductivity. If the inverter outside the cold internal heat, means that the inverter thermal performance is not excellent. This is analogous to the relationship between a thermos flask and an ordinary water Cup:

It is well known that the cup with the same temperature hot water is faster than the Thermos Cup, and the cup wall is hotter than the Thermos cup wall. This is because the insulation between the inside and outside the wall for the vacuum, no heat conduction medium, so the outer wall temperature is low, the internal heat does not go out, to achieve thermal insulation effect

The heat dissipation principle of the inverter is similar to the single Layer cup heat dissipation principle, which can quickly transfer the heat of the internal components of the inverter to the purpose of reducing the temperature of the internal components of the inverter, and the inverter improves the work and service life.

From the known good heat dissipation performance for the inverter is very important, the following specific explanation of the inverter heating and cooling principle.

Thermal and thermal design of inverter

1, the circuit, the active components as long as the current on the heat will be generated. The main heating devices in inverter are: Switch Tube (IGBT, MOSFET), magnetic core element (inductor, transformer), etc. Therefore, in order to ensure that the components can work at rated temperature, the cooling capacity of the system is very important.

2, inverter work when the heat is unavoidable, such as a 5kW inverter, general system heating power is about the total power of the inverter 1.5-2.5%, its heat loss is about 75-125w. Therefore, the cooling system is very important, for small-scale household systems, the industry usually uses natural heat dissipation methods.

3, to make the thermal performance excellent, can be achieved by the following:

① the larger the heat dissipation area, the better the effect

For example, 5kW inverter heating power of 125W, according to 60 ℃ natural cooling can assume the maximum heat flux of 0.05w/cm2 calculation of the heat dissipation area of at least 0.25m2, in order to ensure that the size of the radiator surface area, the radiator surfaces using multiple heat-dissipation teeth and folds design, In this way, the radiator and air contact area will be increased, in favor of rapid cooling.

The inverter shell is aluminum alloy with good thermal conductivity. As pictured above, the use of integral shell structure, radiator and shell through a large area directly close links, the heat of the components through the radiator directly to the aluminum alloy shell, forming a device → radiator → shell → air cooling path.

In addition, the heat of the component can be transmitted through the internal air of the inverter to the outer shell, then through the outer air. Formed a device → internal air → shell → another cooling path of the external air.

The use of a non integral shell, the shell and radiator between the need to connect two times, not close contact. Therefore, participate in the heat dissipation only radiator and a small part of the intermediate shell, the upper shell does not participate in heat dissipation, so that the overall cooling performance greatly reduced.