How to design effective power supply thermal management in industrial and medical systems
up to 600 watts of continuous output power and peak power of 720 watts for 1 ms ( Figure 5 ). These PSUs are available with output voltages of 12, 15, 24, 30, 48, and 58 V DC . For example, the VPS600-1048 has an output of 48 VDC. These units include a 5 V DC , 500 milliamperes (mA), standby power output and a 12 volt, 500 mA, fan output. While the ABC601 series is offered in two package styles, the VPS600 series is available in three with different power ratings: convection cooled U channel rated for 600 watts, slotted cover units rated for 420 watts, and plain cover units rated for 360 watts.
The various output voltage options and package styles have different derating curves. For example, the derating for 24 V DC output units is: ■ Open frame - Convection load, 600 watts continuous up to 30°C ■ Slotted cover - Convection load, 420 watts continuous up to 30°C ■ Plain cover - Convection load, 360 watts continuous up to 30°C ■ For all cover styles - Derate between 30 and 50°C by 0.833% per °C - Derate above 50°C by 2.5% per °C to a maximum of 70°C
Figure 6: The ABE1200/MBE1200 PSUs deliver 1200 watts with input voltages from 180 to 305 VAC and 1000 watts with input voltages from 85 to 180 VAC. (Image source: Bel Power Solutions)
Figure 4: ABC601 PSUs are available with fan cooling (top) or convection cooling (bottom). (Image source: Bel Power Solutions)
The input voltage effect PSU efficiency can be reduced at lower input voltages, resulting in derating of the nominal output power. For example, the ABE1200/MBE1200 series of AC-DC power supplies provide 1200 watts with an input of 180 to 305 V AC , and 1000 watts with an input range of 85 to 180 V AC ( Figure 6 ). These nominal ratings are from 0 to 60°C. At 70°C, they derate linearly from 1200 to 1100 watts and from 1000 to 900 watts, respectively. These PSUs include a fan speed control to minimize audible noise when maximum airflow is not needed. They are available in three 1U height compatible packages, including an enclosed model with two fans (24 V DC models only), and a U-shaped chassis with two protective cover options ( Figure 7 ).
Figure 5: The VSP600 series is available in three package configurations with different nominal power ratings; 600-watt convection cooled U channel units, 420-watt slotted cover units, and 360 watt plain cover units. (Image source: Bel Power Solutions)
Figure 7: The ABE1200 PSUs are available with dual fans (24 VDC models only), and two choices of protective covers. (Image source: Bel Power Solutions)
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