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LM1851 데이터시트(PDF) 7 Page - Texas Instruments |
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LM1851 데이터시트(HTML) 7 Page - Texas Instruments |
7 / 10 page Application Circuits (Continued) in practice the actual value of C1 will have to be modified to include the effects of the neutral loop upon the net charging current The effect of neutral loop induced currents is diffi- cult to quantize but typically they sum with normal fault cur- rents thus allowing a larger value of C1 For UL943 requirements 0015 mF has been found to be the best compromise between timing and noise For those GFI standards not requiring grounded neutral de- tection a still larger value capacitor can be used and better noise immunity obtained The larger capacitor can be ac- commodated because RN and RG are not present allowing the full fault current I to enter the GFI In Figure 2 grounded neutral detection is accomplished by feeding the neutral coil with 120 Hz energy continuously and allowing some of the energy to couple into the sense trans- former during conditions of neutral fault Typical Application TLH5177 – 6 Adjust RSET for desired sensitivity FIGURE 2 120 Hz Neutral Transformer Approach 6 |
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