怎么使用MCP6001运算放大器检测负电压信号

听起来不错，我只是不确定它会工作没有负电源。但是，你可以用一个电阻分压器输入，使它设置为@ +100mV，当输入为0V，并进入0V（或左右）当输入变为负…



      以下为原文

    Sounds good enough, I am just not sure it will work without a negative power supply.
But, you could power that input with some resistor divider so that it's set @+100mV when input is 0V, and goes to 0V (or so) when input becomes negative...

+ 1的电阻分压器，以拉动输入更积极的过渡点。：）



      以下为原文

    +1 for resistor divider to pull the input more positive at the transition point. :)
 

谢谢你的输入。在我自己测试之后，我会考虑一下这个方法。



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    Thanks for your input.  I'll consider this approach after some testing of my own.

如果你有一个比较器和一个已知的电压基准，使用四个电阻器来创建两个分压器。假设你的参考是2.5 V。创建一个50%分频器，并连接它从2.5引用返回/共用，创建一个1.25 V参考。假设你的两个分频电阻器是10千欧。然后创建另一个分频器，并将一端连接到2.5 V参考端，另一端连接到被检测到的电压。选择分频器中的电阻器，使得当感测电压＝100毫伏时，分频器的中心点电压为1.25 V。在这个例子中，如果分频器的顶部电阻为10千欧，则底部电阻（连接到您感测的电压）将是（1.35 V/1.25 V）* 10 KOHM＝10800。欧姆＝＞10.7个KOHM，11个KOHM，或10.7个KOHM系列，100欧姆，用于精确传感。这种技术可以让你感觉到电压变为负，而不必担心比较器的输入变为负或违反共模输入电压范围规范。如果这还不清楚，请让我知道，我会尝试发布一个示意图。



      以下为原文

    If you have a comparator and a known voltage reference use four resistors to create two voltage dividers.  Suppose your reference is 2.5 V.  The create a 50% divider and connect it from your 2.5 reference to return/common to create a 1.25 V reference.  Suppose your two divider resistors were 10 kOhms.  Then create another divider and connect one end to the 2.5 V reference and the other to the voltage being sensed.  Choose the resistors in the divider such that when the sensed voltage = -100 mV the center point voltage of the divider is 1.25 V.  In this example, if the top resistor of the divider was 10 kOhms then the bottom resistor (connected to your sensed voltage) would be (1.35 V/1.25 V) * 10 kOhm = 10800 ohms => one of 10.7 kOhms, 11 kOhms, or a 10.7 kOhms in series with 100 ohms for precise sensing.  This technique allows you to sense when a voltage goes negative without ever worrying about the inputs to the comparator going negative or violating common mode input voltage range specifications.

If this was not clear let me know and I will try to post a schematic.

谢谢鲍伯，你写了一个清晰的解释。我的主要疑问是关于运算放大器的使用。我已经使用了类似的更精确的运算放大器，用于单电源轨精密整流器，其中信号接地也是运算放大器-VE／GNDAdvand，它们在放大倒置信号时工作良好。我只想使用更便宜的运算放大器，因为我不需要精度。



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    Thanks Bob, you wrote a clear explanation. My main query is with regard to the use of the Op Amp. I have used similar more precision op-amps for single supply rail precision rectifiers, where signal ground is also op amp -Ve/ gnd supply and they work fine at amplifying inverted signals. I just want to use a cheaper op amp as I don't need the precision.

国产品牌可替代这款芯片，需要可以回复哦