Huntkey Win7 6600 Power Supply Review

Primary Analysis

On this page we will take an in-depth look at the primary stage of the Huntkey Win7 6600. For a better understanding, please read our “Anatomy of Switching Power Supplies” tutorial.

This power supply uses two T8KB80 rectifying bridges connected in parallel, attached to the same heatsink as the active PFC transistors and diode. Unfortunately, we couldn’t find the datasheet for these components, but it is clear that each bridge supports up to 8 A. So in theory, you would be able to pull up to 1,840 W from a 115 V power grid. Assuming 80% efficiency, the bridges would allow this unit to deliver up to 1,472 W without burning themselves out. Of course, we are only talking about these particular components. The real limit will depend on all the components combined in this power supply.

Figure 10: Rectifying bridges

The active PFC circuit uses two STP26NM60N MOSFETs, each one supporting up to 20 A at 25° C or 12.6 A at 100° C in continuous mode (note the difference temperature makes), or 80 A at 25° C in pulse mode. These transistors present a 165 mΩ resistance when turned on, a characteristic called RDS(on). The lower the number the better, meaning that the transistor will waste less power, and the power supply will have a higher efficiency.

Figure 11: The active PFC diode and the active PFC transistors

The output of the active PFC circuit is filtered by one 330 µF x 450 V electrolytic capacitor from a company called TL, labeled at 85° C.

In the switching section, two STF13NM60N MOSFETs are employed using the traditional two-transistor forward configuration. Each transistor supports up to 11 A at 25° C or 6.93 A at 100° C in continuous mode, or up to 44 A at 25° C in pulse mode, with an RDS(on) of 360 mΩ.

Figure 12: Switching transistors

The primary is managed by the omnipresent CM6800 active PFC/PWM combo controller.

Figure 13: Active PFC/PWM combo controller

Let’s now take a look at the secondary of this power supply.