Heat dissipation design of solar inverters

The main task of the solar inverter heat radiation system is to select a reasonable heat dissipation and cooling method, to control the temperature of the electronic components under the specified value, to provide a low heat resistance channel between the heat source and the external environment, so as to ensure that the heat can be sent out smoothly.

(1)Loss calculation
To design the heat dissipation system, the heat of the inverter must first be calculated. The main heat generating devices of the inverter are the power switch tube and the filter inductor, and the transformer. The efficiency of transformers and inductors can be customized by consultation with manufacturers. The loss of the power switch tube can be calculated by software simulation. The loss is related to the output current, the DC voltage, the power factor, the overload coefficient, the modulation coefficient and the output frequency.

(2)Selection of heat dissipation method
The thermal design of electronic equipment should begin with the method of determining the cooling method of the equipment. The selection of cooling methods should be based on the heat flow density, temperature rise requirements, reliability requirements as well as the size, weight, economy and safety, and choose the simplest and effective cooling method. Heat sink is added to forced air cooling according to heat flux and temperature rise. The forced air cooling is reliable, easy to maintain, and relatively low in cost. It is a better cooling method, so it is widely used in the cooling system of electronic equipment which needs heat dissipation, and it is also the main cooling form of high power devices.

(3)Thermal design steps
The design of forced air-cooled heat sink with radiator is very complicated. Here are the basic methods and steps for this relatively complicated situation.
A.Considering the factors such as equipment structure, wind pressure, cost and heat dissipation efficiency, combined with the simulation results of thermal simulation software, determine the structural parameters of the radiator.
B.According to the heat balance equation, the fan is initially determined by calorific value.
C.The thermal design of the whole machine is accomplished by using a fan and designing a reasonable air duct.
D.The thermal simulation software is used to simulate the thermal design. If the final component temperature exceeds the allowable value, then the structural parameters of the radiator need to be adjusted, and the fan need to be reselected and the above steps are repeated. The final design makes the device temperature below the allowable value and achieves the optimization of the heat dissipation system.

(4)Radiator design
The design of the radiator should take into account the structural requirements, cost, wind pressure, heat dissipation efficiency and processing technology of the electronic equipment. The fin of radiator is suitable for thin, but too thin is difficult to process.When the radiator size is fixed, the smaller the fin spacing is, the smaller the thermal resistance. However, if the spacing is too small, the wind resistance will be increased, and the heat dissipation will be affected. Increasing the fin height can increase the heat dissipation area, that is, increase the heat dissipation. However, for the straight rib of the same section, the heat transfer will no longer increase after the height of the rib is increased to a certain extent. If the ribs are further increased, the efficiency of the ribs will decrease sharply and the wind resistance will be increased.

(5)Air duct design for the whole machine
The basic principles for the design of the wind tunnel are as follows.
A.The air flow and flow rate through the fin of the radiator should be increased as far as possible, so as to improve the heat dissipation effect.
B.It is necessary to reduce windage resistance to prevent excessive pressure loss.
C.The outlet air duct should also ensure that the heat flow can be discharged smoothly.

(6)Thermal design simulation
The software can simulate the thermal status of the system more accurately, and the working temperature of each component can be predicted in the design process. This can correct unreasonable layout and achieve a good layout, thereby shortening the development cycle of the design, reducing the cost and improving the success rate of the product. The heat of the electronic equipment can be effectively controlled, so that it can work within the specified temperature limit, thus improving the reliability of electronic equipment.

SSP3119C 3-5KVA On/off Grid Hybrid Solar Inverter with Energy Storage

■Pure sine wave output
■Self-consumption and Feed-in to the grid
■Programmable supply priority for PV, Battery or Grid
■User-adjustable charging current and voltage
■Monitoring software for real-time status display and control
■Parallel operation up to 6 units only for 3K/4K/5K models
■Programmable multiple operation modes: Grid-tie,off-grid and grid-tie with backup
On Off Grid Hybrid Solar Power Inverter with battery pack,high frequency pure sine wave output, PF.=1.0, parallel working Max 6units(30KW) – SSP3119C 3-5KVA

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