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PC Power Supply Discussion Troubleshooting and discussion of computer power supplies |
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#1
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http://www.chiphell.com/article-5917-4.html
Main topology is about the same as AX1200, which is a 2-phase interleaved CCM-PFC stage, followed by a 2-stage DC-DC converter. The first stage is a buck pre-regulator stage, and the second stage is a 2-phase interleaved LLC-HB resonant converter (with secondary SR) working in fixed-frequency fixed-duty mode which provides the isolation between primary and secondary and the voltage step-down. The 2-stage 12V converter is controlled by a UC3843 current-mode PWM controller. The minor rails DC-DC and standby circuit are traditional designs controlled by analog controllers. The interleaved CCM-PFC is controlled by the DSP on the primary side, while the two MCUs on the secondary side take care of the fan control, housekeeping functions and USB communications to the host. In a nutshell, AX1200i is AX1200 equipped with digitalized interleaving PFC stage and digital supervisory chips. In the test, AX1200i exhibited amazing voltage regulations on all major rails, very high efficiency, very fast transient response on +12V output but lackluster response on minor rails.
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#2
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I might be missing the translation, but what does he mean by "扎实的电路所具备的超载潜力未能充分释放"?
And I love this: "模组化接口板处的众多TAICON电容不太搭配" Yes... even Chinese are disappointed with seeing Chinese capacitors.
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#3
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It means something like: Considering high-end components are used in this unit, the OPP point is relatively low. Our expectation of overload result was more than only 20%. |
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jonnyGURU (12-11-2012) |
#4
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Of course he thought TAICON caps here doesn't quite suit this monster. In his modding, he prefers SANYO OS-CON polymers, FPCAP polymers, X-CON ULR polymers (for its high capacity) and SANYO POSCAP TPD Ta-polymers. Yeah.. whenever possible, he replaces Al-e with Polymers.
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#5
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Doesn't that carry a great potential for unbalancing regulation, because of the much lower ESR and usually a significantly lower capacity? I believe there are cases where unwanted resonance can occur because the original engineering team didn't count on such drastically different values, causing worse performance, or even a protection IC enforced shutdown.
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#6
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