On this page we will take an in-depth look at the primary stage of the IN WIN Power Man IP-P600CQ3-2. For a better understanding, please read our Anatomy of Switching Power Supplies tutorial.
This power supply uses two GBU806 rectifying bridges connected in parallel, attached to an individual heatsink. Each bridge supports up to 8 A at 100° C 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 components, and the real limit will depend on all the other components in this power supply.
The active PFC circuit uses two IPA60R190C6 MOSFETs, each one capable of delivering up to 20.2 A at 25° C or up to 12.8 A at 100° C (note the difference temperature makes) in continuous mode, or up to 59 A in pulse mode at 25° C. These transistors present a 190 mΩ resistance when turned on, a characteristic called RDS(on). The lower this number the better, meaning that the transistors will waste less power and the power supply will achieve a higher efficiency.
The output of the active PFC circuit is filtered by a capacitor from OST, labeled at 85° C.
In the switching section, two 2SK3934 MOSFETs are used, installed in the two-transistor forward configuration. Each of these transistor support up to 15 A at 25° C (unfortunately the manufacturer doesn’t say the current limit at 100° C) in continuous mode, or up to 60 A at 25° C in pulse mode, with an RDS(on) of 230 mΩ.
The primary is controlled by a CM6802 active PFC/PWM combo controller.
Now let’s take a look at the secondary of this power supply.