Introduction of three traditional methods for high temperature cooling of DC power supplies
With the development of DC power supply towards high frequency and miniaturization, its power density can be continuously improved, so the research on the problem of current heating becomes more and more important, and temperature is one of the most important factors affecting the reliability of DC power supply. If the temperature of the device is higher than the rated operating temperature, the reliability of the device will be halved as the temperature increases (every 10°C change), and the limit value of the power supply will be exceeded, which will cause damage to the device and power outage. In addition to selecting low-power devices and optimizing network topology to reduce the heat generated by modules, efficient, safe and reliable cooling methods are an important part of becoming a high-power, high-density DC power supply.
It should be understood that there are three traditional methods of cooling: natural convection cooling, forced air cooling or forced water cooling. Considering the limited level of air cooling (natural convection, forced air cooling) heat dissipation technology, and the current situation of the forced water cooling management system with complex structure and low reliability, the DC power supply urgently needs high cooling capacity, safety and reliability. Reliable cooling method. Unlike air and water cooling, which require a cooling medium to dissipate heat, evaporative cooling technology utilizes the latent heat of vaporization when heating a cooling medium with high insulation and a low boiling point to dissipate heat.
Currently, full immersion evaporative cooling, the traditional form of surface mount and cooling nozzles, is constructed by the thermal performance of the heating element and selected cooling device. The heat source of the DC power supply has the characteristics of large number, scattered distribution, uneven heating, and complex geometric shape of the heat source. With full immersion evaporative cooling, the power management module can be immersed directly in the coolant, and the heater can fully expand with the coolant. It directly affects the contact, the heat dissipation effect is good, the system design structure is simple, and the reliability is high. It is a structurally different preferred form of evaporative cooling technology powered primarily by DC.
Researchers of 12V/2kW DC power supply, from the perspective of theoretical analysis, simulation modeling and immersion cooling, research the thermal performance of DC power supply, simulation and experiment verify the accuracy of theoretical research and analysis, and can be used for cooling of DC power supply Feasibility and benefits of technology development for fully submersible evaporative cooling system technology.
The DC power supply with full immersion evaporative cooling not only has a simple cooling structure, but also has the advantages of low steady-state temperature rise, uniform temperature distribution, no local overheating during dynamic processes, and low heat load. In addition, immersion evaporation does not require a special channel design to cool the DC power supply, which has the advantages of greater flexibility in device layout, reduced power supply size, and increased power density.
The temperature environment of the main components of the DC power supply with full immersion evaporative cooling has a small rate of change during start-up, and there will be no immediate temperature overshoot during the cooling process, thermal stress from continuous operation, and high school children The safety of power management operation and the reliability of meeting the cooling requirements of DC power supply have good application prospects in the field of DC cooling.
