Courses
Fundamentals of AC/DC LED Drivers & Power Factor Correction
Fundamentals Course
May 2011
Comment
rode666
Joseph, I didn't say that reactive loads don't change the phase - I referred to ...
Joseph.Schachner
Actually, for reactive loads Power Factor DOES shift the current relative to the ...
Light emitting diodes (LEDs) are quickly becoming the preferred source of lighting for area illumination designs, primarily due to their efficiency, which is much higher than alternative light sources such as standard incandescent bulbs. Despite their apparent simplicity, they are nonlinear, non-resistive loads. Therefore, LEDs have some unique drive issues, and also affect the AC-line power factor.
This Fundamentals course will look at issues related to configuring and driving single LEDs and multiple-LED arrays. It also explores power-supply topologies, power isolation, and providing power factor correction (PFC) where needed to meet regulatory standards or system requirements.
Presented by: Bill Schweber, Editor, Power Management Designline
This Fundamentals course will look at issues related to configuring and driving single LEDs and multiple-LED arrays. It also explores power-supply topologies, power isolation, and providing power factor correction (PFC) where needed to meet regulatory standards or system requirements.
Presented by: Bill Schweber, Editor, Power Management Designline
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kinnar
5/6/2011 11:40 PM EDT
LED are getting promoted in lighting almost on the every part of the globe, this tutorial will really really going to be helpful in understanding the critical parameters needs to be taken care of to bring out a sustainable product, this kind of courses will be uplifting the technological knowhow at the same time promoting the products.
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Mike79
5/18/2011 7:33 PM EDT
Good info.
Thanks
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Semiman_#1
5/26/2011 10:21 PM EDT
A whole lot of discussion on LED driving which can be found in about a thousand places now. Really not much depth at all on PFC though which would have been interesting and valuable.
Semiman
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rode666
6/3/2011 6:23 AM EDT
Not very helpful when the description of power factor was completely wrong. SMPS do not cause phase shift between voltage and current, they have a distorted (but in phase) current waveform. When falsehoods like this are posted online on technical websites it confuses the newcomers because they hear conflicting claims.
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Joseph.Schachner
11/8/2011 11:15 AM EST
Actually, for reactive loads Power Factor DOES shift the current relative to the voltage sine wave.
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rode666
11/8/2011 4:37 PM EST
Joseph, I didn't say that reactive loads don't change the phase - I referred to *distorted* waveforms. While there may be a very small effective phase shift, it is immaterial and is *not* the cause of the poor power factor.
If you argue that it is only phase shift that is relevant to power factor, then I suggest you change jobs.
The falsehood of power factor and phase (but ignoring waveform distortion) has to stop, but as long as this nonsense is included in seminars, it won't go away.
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