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设计了一种基于MCP30F511微芯片演示板的PCB板。第一个小尺寸的设计给出了精确的PF值,但是基于相同设计的新板,所有8个板都给出了不正确的值。我使用的是一个高电压12V专用SMPS。不管实际的PF,它总是给出单位(1 PF)。进行单点校准,它似乎对有功功率、电压、电流和频率起作用。第二板的分流电阻离电能表IC有点远,试着把它移近,但没有区别。这个问题的原因是什么?
以上来自于百度翻译 以下为原文 Designed a PCB based on MCP39F511 Microchip demo board. The first design which was small in size was giving accurate PF values, but the new boards based on the same design, all 8 of them are giving incorrect value. I am using a Hi-Link 12V dedicated SMPS. Irrespective of the actual PF it always gives unity (1 PF) . Single point calibration was done and it seems to work for active power, voltage, current and frequency. The second board has the shunt resistor a little far away from the energy meter IC, tried moving it closer, but it made no difference. What could be the reason for the problem ? |
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12个回答
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你能提供一个IC和一个分流电阻端子的PCB图吗?如果由于MV和更好的信号容差要求,IC远离并联电阻器是不正确的。理想情况下,IC分流输入应该位于并联电势垫上,尽可能接近。如果你的PCB是大的,你不能移动IC的分流电阻器比你必须重新设计的设备,并把功率计部分分裂成小传感器PCB,应安装更接近分流。恕我直言。
以上来自于百度翻译 以下为原文 Can you provide PCB drawing around an IC and a shunt resistor terminals? It is incorrect if the IC is distant form shunt resistor due to mV and better signal tolerances requirements. Ideally the IC shunt inputs should reside right on a shunt potential pads, as close as possible. If your PCB is large and you can't move the IC right to the shunt resistor than you had to redesign the device and split the power meter part into small sensor PCB which should be mounted closer to the shunt. IMHO. |
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谢谢尼古拉的回复,但是如果是这样的话,电流是怎么回事?它只有PF始终保持统一,有功功率和电流对具有无功分量的负载是正确的。有2个铁氧体珠和2个电阻器有效地与分流电阻器串联,在PCB轨道上的微芯片演示板的总有效距离大约为14mm,在我的原板上大约20mm。这会使功率因数永远是统一的吗?你有什么方法来证实这一理论吗?IC附近没有可以被挖掘出来的通孔,几乎无法测试。
以上来自于百度翻译 以下为原文 Thanks Nikolay for your reply, but if that is the case, how is that the current is right ? Its only the PF which always remains unity, the active power and current is correct for loads which have reactive component. There are 2 ferrite beads and 2 resistors that are effectively in series with the shunt resistor, the total effective distance on the PCB track of the Microchip demo board is approximately 14mm and on my proto board its around 20mm. Will that make a difference in power factor that is always unity ? Do you suggest some method to confirm the theory ? There are no vias near the IC that can be tapped out, making it almost impossible to test. |
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20mm距离不是很差。当然还有其他问题。可能你看起来不同了吗?
以上来自于百度翻译 以下为原文 20mm is not a bad distance. Sure there is something else wrong. May be you're looking different register? |
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相同的固件不同的板工作,+ IAM使用微芯片软件进行校准和检查值,因此没有错误的寄存器的问题。结果很糟糕,有人知道吗?
以上来自于百度翻译 以下为原文 Same firmware different board it works, + Iam using Microchips software for calibration and for checking the values, so there is no question of wrong registers. This has turned out to be terrible, anyone has any clue ? |
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你确定你的浮动针已经浮动了吗?你有没有保证“两个周期的累积间隔”?我认为现在是时候寻求支持,或者更好,FAE。
以上来自于百度翻译 以下为原文 Are you sure you've left floating pins floating? Have you ensured: "accumulation interval of 4line cycles" for both cases? I think it's a time to ask the support or, better, FAE. |
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浮动引脚确实是浮动的,我不会改变积累间隔,这是我所知的。是的,看起来支持请求必须被提出来。
以上来自于百度翻译 以下为原文 Floating pins are indeed floating, I am not changing accumulation interval to the best of my knowledge. Yes, looks like a support request has to be raised. |
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好的另一个更新,我做了一个工厂重置,并且部分给出了相当精确的PF值,但是其他值不准确。在进行单点校准时,它回到了PF变得统一的先前情况。
以上来自于百度翻译 以下为原文 Ok another update, I did a factory reset, and the part gives reasonably accurate PF values, but other values are not accurate. On doing single point calibration, it's back to the previous situation where PF becomes unity. |
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电压和电流传感器之间的极性失配?
以上来自于百度翻译 以下为原文 Polarity mismatch between voltage and current sensors? |
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电流传感器为分流器,电压为电源。在两者之间尝试切换V+V的电路。但结果是一样的。除此之外,如果它不匹配,PF是如何准确的工厂默认校准?
以上来自于百度翻译 以下为原文 Current sensor is shunt and voltage is mains. In between tried switching V+ V- of the circuit. But results were the same. Apart from that if its a mismatch how is it that the PF is accurate with factory default calibration ? |
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问题解决后接触微芯片支持。必须使用SET范围和目标正确设置范围值。除了单点校准之外,我还必须进行相位和无功校准。
以上来自于百度翻译 以下为原文 Problem resolved after contacting Microchip support. Had to set range values correctly using set range and targets. I also had to do phase and reactive calibration apart from single point calibration. |
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很高兴知道你已经解决了这个问题。谢谢分享你的经验!如我所知,对于功率因数计算,需要进行各种校准。
以上来自于百度翻译 以下为原文 Good to know you've resolved the problem. Thanks for sharing your experience! As I understood, for power factor calculation all kind of calibrations are needed. |
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对于任何寻找微芯片演示板缺省范围值的人来说,它的跟随电流范围=0cPosi:13Eng:12.如果单点校准在演示板上给出不正确的PF和其他值,则尝试上述范围的值,并单击设置范围和目标。在进行单点校准之前,您还可以使用这些值作为自己的板的开始。另外一个有用的信息是,对于反应/相位校准,我已经发现,不需要0.5PF,而电流和功率的低值对我起作用。
以上来自于百度翻译 以下为原文 For anyone looking for default range values for Microchip demo board, its as follows Current Range = 0c Power :13 Voltage:12 If single point calibration gives incorrect pf and other values on demo board try the above values for range and click set range and targets. You can also use those values as a start for your own board before doing single point calibration. One more useful information is that for reactive/phase calibration I've found that 0.5pf is not a must and low values for current and power worked for me. |
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