A Look Inside
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The input filtering on the ZS Series 650W starts at the AC inlet, where there is an X capacitor and two Y capacitors. The main PCB adds another X capacitor, two common-mode chokes, three Y capacitors (two on the AC side which hide under the X capacitor, and one after the rectifier, near the opto-isolators), and one rather large MOV, bringing the total number of components to two X capacitors, two common-mode chokes, five Y capacitors and one MOV. That’s more than enough components for the job. The bridge rectifier is an 8A part bolted to a heat sink. The PFC section uses a single 20A Infineon SPW20N60C3 MOSFET. Interestingly, the ZS Series 650W units sold in the US have two transistors in this area, which doubles the capacity of the PFC circuit. The unit will probably still work on 110V AC, but would be unable to deliver the labelled 650W without blowing the transistor, which explains the silver sticker next to the AC receptacle. A 330μF Panasonic UQ series primary capacitor is used. The switching transistors used are Fuji Electric FMV19N60ES Power MOSFETS rated at 19A. The primary side is controlled by the very popular Champion Micro CM6800 PFC/PWM controller combo.
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The capacitors from on the secondary side are all made by the Japanese Nippon Chemi-Con. This is something I would like to see more often, and it goes to show that Japanese capacitors can be squeezed into a less expensive power supply. The soldering is tidy, although a few of the legs could have been cut a bit shorter. One of the legs on one of the switching transistors didn’t get enough solder, but this is the exception, not the rule, so it won’t affect the final score very much.
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The 12V rail uses two MOSPEC S30D45C Schottky rectifiers rated at 30A each. The 5V and 3.3V rails each use two PFC Devices PFR30L45CT Schottky rectifiers. They are rated at 30A each, but PFC Devices no longer has PDF datasheets available for them. Since all of the rails use a pair of 30A rectifiers, they are capable of up to 60A in theory. The monitoring IC used is a Silicon Touch Technology PS223. It supports Over Temperature Protection (OTP), Under Voltage Protection (UVP), Over Voltage Protection (OVP) and Over Current Protection (OCP) for up to two 12V rails, although the manufacturer opted not to take advantage of this and only use a single 12V rail.
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Cooling is achieved by a Ball Bearing fan the size of the Globe. At full speed, it spins at 1500RPM and pushes 106.86CFM of air with a noise output of 29.2dBA. The noise was barely noticeable until Test 5. Even during the overload test, it still wasn’t disturbing. This is largely thanks to the fact that, for an 80 Plus Bronze unit, the heat sinks are large and have a lot of surface area.
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