The heat dissipation efficiency of high-frequency online UPS is closely related to the ambient temperature. Generally, the higher the ambient temperature, the lower the heat dissipation efficiency. The specific manifestations are as follows:
High temperature environment: When the ambient temperature exceeds the ideal operating temperature range of UPS (usually 15 ℃ -25 ℃), the internal electronic components of UPS will heat up more significantly. At this point, due to the decrease in temperature difference between the inside and outside, the heat dissipation effect of the cooling system will be suppressed, making it difficult to effectively dissipate heat into the environment, resulting in an increase in internal temperature. For example, some UPS systems that do not adopt efficient heat dissipation design may experience a situation where the cooling fan runs at full load but the internal temperature continues to rise when the ambient temperature reaches 35 ℃ or above, which in turn affects the stability and efficiency of the equipment. However, some high-frequency online UPS systems that use advanced heat dissipation technology, such as Uber's 400Hz high-frequency UPS, can operate continuously at full load at an ambient temperature of 45 ℃ by using silicon carbide (SiC) power devices and three-dimensional heat dissipation ducts.
Low temperature environment: Although the internal components of UPS generate relatively less heat in low temperature environments, excessively low temperatures can also have adverse effects on heat dissipation efficiency. On the one hand, low temperatures can increase the viscosity of cooling media (such as air and coolant), deteriorate their fluidity, and thus reduce the effectiveness of heat conduction and convective heat dissipation. On the other hand, low temperature may lead to a decrease in battery performance, an increase in battery internal resistance, and a decrease in discharge capacity, requiring UPS to consume more energy to maintain output during operation, which indirectly affects the heat dissipation efficiency of the equipment.
In addition, rapid changes in ambient temperature may also affect the heat dissipation efficiency of UPS, as rapid temperature changes can cause thermal stress inside the equipment, which may affect the performance and connection stability of heat dissipation components.
