Huntkey V-Power 550 W Power Supply Review

Secondary Analysis

Huntkey V-Power 550 W has five Schottky rectifiers on its secondary, two for the +12 V output, one for the +5 V output and two for the +3.3 V output, all identical to the ones used on Green Star 550 W.

Since this power supply uses a half-bridge configuration to calculate the maximum theoretical current each output can deliver is easy: all we need to do is to add the maximum current supported by all diodes.

The +12 V output is produced by two MBR20H100CT Schottky rectifiers connected in parallel, each one capable of handling up to 20 A at 100° C (10 A per internal diode). The Green Star 550 W that we reviewed used two STPS20S100CT rectifiers here, which are the same parts but from a different supplier. The maximum theoretical current the +12 V output from this power supply can deliver is of 40 A or 480 W. Of course this math is just an exercise and the actual limit depends on several other factors. It is important to note that this is the same configuration and rating used by the 400 W and 450 W models from Green Star series.

The +5 V output is produced by one S40D40C Schottky rectifier, which is capable of handling up to 40 A at 100° C (20 A per internal diode). So the maximum theoretical current the +5 V output from this power supply can deliver is of 40 A at 100° C or 200 W. This is exactly the same component used on Green Star 550 W, but it is different component from the 400 W and 450 W models from Green Star series, which use a 30 A (150 W) rectifier.

The +3.3 V output is produced by two STPS2045CT Schottky rectifiers connected in parallel, each one capable of delivering up to 20 A at 155° C (10 A per internal diode). So the maximum theoretical current the +3.3 V output from this power supply can deliver is of 40 A at 155° C or 132 W. This is exactly the same component used on Green Star 550 W, but it is a different component from the 400 W and 450 W models from Green Star series, which use a 30 A (99 W) rectifier.

It is always good to remember that the real current/power limit for each output will depend on other factors, like the coils and the width of the printed circuit board traces.

Figure 12: The two +12 V rectifiers, the +5 V rectifier and one of the +3.3 V rectifiers (the other one is on the other side of the heat
sink).

The secondary is monitored by an SG6105 integrated circuit, which provides protections such as over voltage (OVP), under voltage (UVP), over power (OPP) and short-circuit (SCP). This integrated circuit is also in charge of controlling the switching transistors from the primary (PWM controller).

Figure 13: Monitoring integrated circuit.

The electrolytic capacitors from the secondary are from KSC, Teapo and Fcon and labeled at 105° C, as usual.

As you can see, Huntkey V-Power 550 W is IDENTICAL to Huntkey Green Star 550 W.