Professional Heat Sink Manufacturer_Dongguan Tongyu Electronics Co., Ltd

PV Inverter

Inverter is also called power regulator. The process of converting DC power into AC power is called inversion. The circuit that completes the inverting function is called inverting circuit. The device that realizes the inverting process is called inverting equipment or inverter. In solar power generation system, the efficiency of inverters is an important factor to determine the capacity of solar cells and storage batteries. The failure of photovoltaic inverters will lead to the shutdown of photovoltaic system, which will directly cause the loss of power generation. Therefore, high reliability is an important technical index of photovoltaic inverters.

The good heat dissipation of photovoltaic inverters is an important condition to ensure its high reliability. Therefore, at the beginning of the design of the inverters, the heat dissipation simulation test has become the first consideration of photovoltaic inverters manufacturers. Tongyu Thermal Power is a professional high-power heat sink plant in China. It has first-class thermal design and development team, reliable thermal simulation and thermal testing capabilities. It has carried out technical cooperation on heat dissipation of inverters with many domestic and foreign photovoltaic inverters manufacturers to provide professional technical support for heat dissipation.

Solution to Heat Dissipation of Photovoltaic Inverter（210KW）

Simulation model and parameter schematic diagram (1)：

ambient temperature：55⁰C，Reactor Heat Consumption：700W

Assuming the system impedance is 80Pa, the curve of the fan passing through the radiator is as follows：

The left figure shows the internal structure of Infineon and the schematic diagram of heating elements.
Diode：59W； IGBT：124.5W； Total：1100WW；
Assuming that the heat conducting medium is：0.15mm Thick，K=3W/m*K.

Assuming the system impedance is 80Pa, the curve of the fan passing through the radiator is as follows：

Heatsink parameters：
Size：W236*L200*H304mm
Fin :
Thick：0.6mm
Pitch between teeth:3.0mm
Number of teeth：77fins
Heat pipe parameters：
D8 Sintered tube or fibre tube；
Use 24pcs U heat pipe (one layer layout) and type 48 PCs L heat pipe (two layers layout)；
Welding with 4258 low temperature solder paste；
Substrate: AL Plate + Copper Plate (IGBT Heat Source Area)
Compared with two-layer heat pipe, one-layer heat pipe has lower cost and higher heat dissipation efficiency.

Simulation sketch of pressure diffusion degree of section in module:

Temperature Diffusion Simulation Diagram of Section in Module：

Temperature diffusion simulation sketch of top heat pipe：

The temperature difference between the two ends of the heat pipe is 5.7 degrees, which meets the actual heat pipe standard.

Temperature diffusion simulation sketch of bottom heat pipe：

The temperature difference between the two ends of the heat pipe is 9 C, slightly higher than the actual, and the actual performance of the heat pipe will be better than the analysis setting.

Temperature Diffusion of Heat Pipe at the Bottom of Radiator：

The actual air intake temperature of the radiator is ~57.1 C, and the maximum temperature of the radiator bottom is 85.1 C， Theoretical analysis of temperature rise of 28℃

NTC Temperature Diffusion Simulation Diagram of Module：

The temperature difference between the two ends of the heat pipe is 9 C, which is slightly higher than the actual situation. The actual performance of the heat pipe will be better than the analysis setting.

Diagram of Fan Action Point：

Summary of simulation data of photovoltaic inverter cooling scheme：

Solution	Ta	Power	H.S Tb max	H.S DT	HTC1	HTC2	HTC3	Fan working point
Al base+ copper block	55	IGBT/3pcs 1100W/each Reactor 700W	85.1	28	87.6	88.1	87.5	1127.5 m^3/Hr 215Pa

Assuming that the air temperature of the system is 55_C and 57.1_C after entering the reactance, assuming the use of thermal conductive medium 0.15mm,K=3W/m*K）