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 Switching Power Supplies A - Z, Second Edition, by Sanjaya Maniktala (Newnes), starting at \$42.69
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Kingwin ABT-450MM Power Supply Review
 Author: Gabriel Torres Type: Reviews Last Updated: March 13, 2008 Page: 5 of 10 Select Page to Load Introduction A Look Inside The ABT-450MM Transient Filtering Stage Primary Analysis Secondary Analysis Power Distribution Load Tests Overload Tests Main Specifications Conclusions
Secondary Analysis
 This power supply uses three Schottky rectifiers on its secondary. Since this unit uses a half-bridge design, the rectifiers use the typical configuration for this topology. Calculating the maximum theoretical current each line can deliver on power supplies using this design is easy: all we have to do is to add the maximum current supported by all diodes connected to the line we are analyzing.The +12 V output is produced by one S30D60C Schottky rectifier, which can deliver up to 30 A (15 A per internal diode, measured at 80° C), which equals to 360 W. The maximum current this line can really deliver will depend on other components, especially the coil. It is also important to notice that almost all power supplies nowadays use two rectifiers connected in parallel on the +12 V line instead of just one.click to enlargeFigure 9: +12 V rectifier.The +5 V output is produced by one S60D40C Schottky rectifier, which support up to 60 A (30 A per internal diode, measured at 80° C). So the maximum theoretical power the +5 V output can deliver is of 300 W. Of course the maximum current (and thus power) this line can really deliver will depend on other components, especially the coil, as mentioned before.The +3.3 V output is produced by another S60D40C Schottky rectifier, which support up to 60 A (30 A per internal diode, measured at 80° C). So the maximum theoretical power the +3.3 V output can deliver is of 198 W. Of course the maximum current (and thus power) this line can really deliver will depend on other components, as mentioned before.Even though this power supply has a separated rectifier for the +3.3 V output, this rectifier is connected to the same transformer output as the +5 V line, so the maximum current +5 V and +3.3 V can pull together is limited by the transformer.click to enlargeFigure 10: +3.3 V and +5 V rectifiers.Here it is crystal clear to us that this power supply uses an obsolete design adapted to meet current market demands – in order words adding SATA power connectors on an old power supply doesn’t mean that the power supply is new! We say that because the +5 V and +3.3 V rectifiers are capable of delivering far more current (and thus power) than the +12 V rectifier. This was the typical scenario with power supplies from SEVEN years ago. Nowadays most power is pulled from the +12 V as the components that pull most of the power – CPU’s and video cards – are connected to the +12 V line.This power supply thermal sensor is located inside the +12 V coil, as you can see in Figure 11. This sensor is used to control the fan speed according to the power supply internal temperature.click to enlargeFigure 11: Thermal sensor.On this power supply the big electrolytic capacitors from the voltage doubler are rated at 85° C, while the electrolytic capacitors from the secondary are rated at 105° C. We couldn’t find out their brands. « Previous |  Page 5 of 10  | Next » Print Version | Send to Friend | Bookmark Article | Comments (5)