Huntkey Jumper 550 Power Supply Review

Primary Analysis

On this page we will take an in-depth look at the primary stage of Huntkey Jumper 550. For a better understanding, please read our Anatomy of Switching Power Supplies tutorial.

Thi
s power supply uses two T10KB80 rectifying bridges connected in parallel and attached to an independent heatsink. We couldn’t find the datasheet for these components, but we can easily assume that these are 10 A bridges, and if we are correct these bridges would allow the unit to pull up to 2,300 W from a 115 V power grid without burning themselves; assuming 80% efficiency, they would allow this unit to deliver up to 1,840 W without burning themselves out. Of course we are only talking about this component and the real limit will depend on all other components from the power supply.

Figure 9: Rectifying bridges.

Two SPW20N60C3 power MOSFETs are used on the active PFC circuit, each one capable of delivering up to 20.7 A at 25° C or 13.1 A at 100° C in continuous mode (note the difference temperature makes) or up to 62.1 A at 25° C in pulse mode. These transistors present a maximum resistance of 190 mΩ when turned on, a characteristic called RDS(on). This number indicates the amount of power that is wasted, so the lower this number the better, as less power will be wasted thus increasing efficiency.

Figure 10: Active PFC diode and transistors.

The electrolytic capacitor used to filter the output from the active PFC circuit is from HEC and labeled at 85° C.

On the switching section Jumper 550 uses another two SPW20N60C3 transistors, as you can see in Figure 11. The specs from these components were already published above.

Figure 11: Switching transistors.

The switching transistors are controlled by the famous CM6800 PWM controller.

Figure 12: PWM controller.

Now let’s take a look at the secondary of this power supply.