Analog And Digital For Soft Starter Control Circuit |
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Analog And Digital For Soft Starter Control Circuit |
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 Dec 1 2007, 09:25 AM
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Junior Member  Group: Full Member Posts: 6 Joined: 28-November 07 Member No.: 4,049  |
Below is the simulation of single phase soft start for induction motor. Am I able to find a microcontroller to replace the control circuit and function as same as it?
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Dec 1 2007, 07:31 PM
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#2
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Posting Freak Group: Moderator Posts: 2,099 Joined: 24-April 02 From: Christchurch, New Zealand Member No.: 1 |
Hello doinfinity
The answer is yes, you can certainly use a microcontroller to get the same result. Remeber, that the microcontroller will do it all digitally. Looking at the diagram, can you explain why, on the bottom rung, there is a constant added in? Best regards, -------------------- Mark Empson administrator
Skype Contact = markempson | phone +64 274 363 067 LMPForum | LMP Tech Warehouse | L M Photonics Ltd | Empson family | Advanced Motor Control Ltd | LMP Software | Mark Empson Website |
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Feb 22 2008, 10:51 AM
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#3
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Junior Member Group: Full Member Posts: 6 Joined: 28-November 07 Member No.: 4,049 |
QUOTE (marke @ Dec 2 2007, 03:31 AM)  Hello doinfinity The answer is yes, you can certainly use a microcontroller to get the same result. Remeber, that the microcontroller will do it all digitally. Looking at the diagram, can you explain why, on the bottom rung, there is a constant added in? Best regards, hi, the constant '5' is added so that to move the waveform above the zero line. |
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Feb 22 2008, 06:53 PM
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#4
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Posting Freak Group: Moderator Posts: 2,099 Joined: 24-April 02 From: Christchurch, New Zealand Member No.: 1 |
Hello doinfinity
QUOTE hi, the constant '5' is added so that to move the waveform above the zero line. Why would you do that? surely this will make the output asymmetrical which will introduce even harmonic currents and is definitely not what you want?Best regards, -------------------- Mark Empson administrator
Skype Contact = markempson | phone +64 274 363 067 LMPForum | LMP Tech Warehouse | L M Photonics Ltd | Empson family | Advanced Motor Control Ltd | LMP Software | Mark Empson Website |
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Feb 26 2008, 05:30 AM
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#5
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Junior Member Group: Full Member Posts: 6 Joined: 28-November 07 Member No.: 4,049 |
QUOTE (marke @ Feb 23 2008, 02:53 AM) Hello doinfinity Why would you do that? surely this will make the output asymmetrical which will introduce even harmonic currents and is definitely not what you want? Best regards, Hi marke, I have made some modification on the control circuit. Below is the circuit, the graph of ramp, the waveform before plus constant 5 and waveform after plus constant 5.     As I am going to use 1 ramp block to compare the triangular generated from the positive and negative cycle, so i add the constant 5 to the negative triangular waveform to make it comparable to the ramp. |
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Lo-Fi Version | Time is now: 1st December 2008 - 10:47 PM |
