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#1
October 14th 03, 07:38 PM
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V and I not in phase at resonance Frequency in RLC network?
Hi,
Well, I'm really confused. I simulate a simple serial R-C-L-Network (all in series). As far as I know the total (input-)Impedance of the network is: Z = R + jwL - j/(wC) resp. the resonance frequency (where Zin=R) is 1/sqrt(L*C). At resonance frequency, the Impedance should be real and therefore in my hummel opinion Voltage and Current schould be in phase. The funny thing is, when i build up such a network in Schematics (Cadence PSD 14.1/Orcad 9.2) and simulate it with the PSpice A/D Simulator, the current is displaced (relative to the voltage) about lambda/4 - obviously not in phase!? Can anyone tell my where I made a mistake? Or why this Problem is showing up? Thanks to anyone reading this and especially to those who post answers. D. Stutzer |
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#3
October 14th 03, 07:56 PM
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On 14 Oct 2003 11:38:29 -0700, (Diego Stutzer)
wrote: Hi, Well, I'm really confused. I simulate a simple serial R-C-L-Network (all in series). As far as I know the total (input-)Impedance of the network is: Z = R + jwL - j/(wC) resp. the resonance frequency (where Zin=R) is 1/sqrt(L*C). At resonance frequency, the Impedance should be real and therefore in my hummel opinion Voltage and Current schould be in phase. The funny thing is, when i build up such a network in Schematics (Cadence PSD 14.1/Orcad 9.2) and simulate it with the PSpice A/D Simulator, the current is displaced (relative to the voltage) about lambda/4 - obviously not in phase!? Can anyone tell my where I made a mistake? Or why this Problem is showing up? Thanks to anyone reading this and especially to those who post answers. D. Stutzer The impedance should be R + jwL + 1/(jwC) d _____________________________ http://www.pearce.uk.com |
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#4
October 14th 03, 08:02 PM
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#6
October 14th 03, 08:30 PM
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Don Pearce wrote:
The impedance should be R + jwL + 1/(jwC) 1/j = j/j*j = j/-1 = -j -j/wC = 1/jwC -- Pawel Stobinski Republic of Poland |
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#7
October 14th 03, 08:30 PM
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Don Pearce wrote:
The impedance should be R + jwL + 1/(jwC) 1/j = j/j*j = j/-1 = -j -j/wC = 1/jwC -- Pawel Stobinski Republic of Poland |
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#8
October 14th 03, 10:32 PM
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John Fields schrieb in im Newsbeitrag: ... On 14 Oct 2003 11:38:29 -0700, (Diego Stutzer) wrote: Hi, Well, I'm really confused. I simulate a simple serial R-C-L-Network (all in series). As far as I know the total (input-)Impedance of the network is: Z = R + jwL - j/(wC) resp. the resonance frequency (where Zin=R) is 1/sqrt(L*C). At resonance frequency, the Impedance should be real and therefore in my hummel opinion Voltage and Current schould be in phase. The funny thing is, when i build up such a network in Schematics (Cadence PSD 14.1/Orcad 9.2) and simulate it with the PSpice A/D Simulator, the current is displaced (relative to the voltage) about lambda/4 - obviously not in phase!? Can anyone tell my where I made a mistake? --- 1 f = ------------- 2pi(sqrt(LC)) -- John Fields WOW!! Thank you soo much. The world is sound and the laws of physics apply again. I just confused w (omega) and f. Best Regards D. Stutzer |
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#9
October 14th 03, 10:32 PM
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John Fields schrieb in im Newsbeitrag: ... On 14 Oct 2003 11:38:29 -0700, (Diego Stutzer) wrote: Hi, Well, I'm really confused. I simulate a simple serial R-C-L-Network (all in series). As far as I know the total (input-)Impedance of the network is: Z = R + jwL - j/(wC) resp. the resonance frequency (where Zin=R) is 1/sqrt(L*C). At resonance frequency, the Impedance should be real and therefore in my hummel opinion Voltage and Current schould be in phase. The funny thing is, when i build up such a network in Schematics (Cadence PSD 14.1/Orcad 9.2) and simulate it with the PSpice A/D Simulator, the current is displaced (relative to the voltage) about lambda/4 - obviously not in phase!? Can anyone tell my where I made a mistake? --- 1 f = ------------- 2pi(sqrt(LC)) -- John Fields WOW!! Thank you soo much. The world is sound and the laws of physics apply again. I just confused w (omega) and f. Best Regards D. Stutzer |
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#10
October 15th 03, 01:25 AM
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The impedance should be R + jwL + 1/(jwC)
You sure?, how do the j parts cancel at resonance if they are both added? |
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