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Sorry I'm so late in viewing this one.

Iron

Thanks for the archive. And thank you Paul and Rob.

Iron

I havent uused heat sinks via vias

Good morning from Mobile, AL

Thank you Paul, looking forward to learn about motor's braking...

Yes, pcb is used as a heat sink 

Oscillations are worked out via PCB design and component adjustment

Slide 7: on diagram shown is a response of stable loop to disturbance it does protect circuit from shoots at load swing

I had trouble with audio during the live broadcast so I caught it on archive with no problem.

Thanks for an interesting presentation.

Iron

Thanks, Paul, for an excellent presentation. And thanks to all who attended. There is plenty more to come. See you tomorrow.

Blogger

OK, I thank you all for attending today.

I hope this was useful to you, and I'll

be back tomorrow for more.  Best, Paul.

 

Blogger

thank you for a good info

Iron

Yes, brushless DC motor control would be good for contrast to brush DC motor control design.

Iron

Yes, hopefully we can do that brushless DC motor

class in the not too distant future.

Blogger

A brushless DC motor class would be great!

Iron

I would like to see a brushless motor class too.

Iron

Thanks for the interesting lesson.

Iron

Yes, please do the brushless DC motor class.

Iron

Rob, Thank you for the response. I really appreciated.

Iron

Mtait:  We would like to do a brushless DC motor

class.  If there is enough interest, then perhaps it

will actually happen.  Hint.... Hint....

Blogger

 

Thanks Paul... Any chance you will be doing a BRUSHLESS DC class soon?

 MTait

 
 
Blogger

Rclipat:  One can't say that one-size-fits-all with power

loss.  Sometimes one will tolerate a lot of heat build up

so as to use inexpensive circuitry.  Other times one will

have no tolerance for any heat build up whatsoever.  One

design choices will be made knowing what is important in

your situation.

Blogger

Thanks, will look forward to day five info.

Iron

on temperature, what recomdations may have for pcb design ?

edeanda
Blogger

Thanks for the interesting lesson.

Iron

What Power Losses ranges are acceptable?

rclipat

 

Blogger

The laquer cover of the board.... that is the solder mask.

Yes, the solder mask is more of a heat insulator, but its thin,

and we clear it where we want heat sinks to make physical contact.

Blogger

Major development constrains are heat and emi

in my opinion.

Blogger

? Slide 13. The laquer cover of the board does not reduce thermal dissipation?

Iron

Current and torque limiting.  Day 5 bibliography

cites an excellent overall text book on the topic.

Blogger

Good presentation (parts I heard), very useful. (repeated dropped postings)

Iron

Can you damp the ringing with a small cap across the motor?

Alaskaman66
Blogger

A small cap across the motor will help.  You almost always see

that on small, cheap, toy car motors and the like, they are a good

low cost help.  Yes, a good idea!

Blogger

??????

Can you tell me where to look for more ideas on "current and torque limiting?

 

Thanks.

Iron

? What are the major development constraints (ie heat, parasitic oscillations, etc) to consider when designing a motor controller? Thanks in advance!

I liked the idea of cycle by cycle torque limiting.

 

Iron

Thank you for finding the other typo on slide 4,

we will re-post today's slide deck by tomorrow with

these minor corrections.

Blogger

Thanks Very nice lecture

Iron

Thanks, Paul. Great lecture

Thanks Paul... Any chance you will be doing a BRUSHLESS DC class soon?

 

Iron

Great Lecture needed it years ago would have saved many hours.

Iron

Excellent lecture, indeed! Thank You!

Iron

Thank you Rob and Paul

Iron

Thank you another nice presentation

dropped post... only current limiting on our static control is PTC or one-time fuse.

Iron

Have not employed current limiting

Iron

I did a design where stuff would often jam the mechanism and stall the motor. It used current limiting to prevent damage to the FET and motor.

Iron

No have not employed current limiting circuitry in my (motor control) design.

Iron

yes have used current limiting circuits.

Iron

I have used limiting current at start.

Iron

Paul's question:

 

Have you employed current limiting circuitry in your designs?

Blogger

"soft start" motor start

Iron

The shunt resistor can also be used for current measurements (Motor load)

Iron

We're now on slide 18.

Blogger

Really enjoying this- good presentation!

 

Iron

We're now on slide 17.

Blogger

i am sorry, but i missed a great part of 14th august.

there was the sount of other webinar, which i couldn't reset.

i had to change of computer.

can i relisten later to the talk ?

 

melotte joseph

 

Iron

We're now on slide 16.

Blogger

Yes, absolutely. In extreme instances, Ive placed cutots in the PCB to let metal protrude to solder the DUT GND for better heat dissipation.

Iron

We're now on slide 15.

Blogger

No, have not used surface mount in design.

Iron

Not designed this kind of boards.

Iron

Frequently use PCB areas for heat sinking SMT parts.

Iron

Yes, we used SMT Heat Sinks in an LLC Resonant Converter

Iron

Yes.  Surface mount heat sinking is used very commonly in my designs.  For all power applications and QFN packages

 

Yes, in power led circuits. 

Iron

Definitely used via/board heat sinking.

Iron

I have, but only with power regulators.

Iron

Yes, but didn't know how to calculate it.

Gold

We're now on slide 14.

Blogger

Paul's question:

 

Has anyone listening used surface mount heat sinking in your designs?

Blogger

We're now on slide 13.

Blogger

on temperature, what recomdations may have for pcb design ?

Iron

We're now on slide 12.

Blogger

We're now on slide 10.

Blogger

Audio is breaking up, and dropping out!

 

Iron

Have never had any explosive meltdowns working with H bridges..............  I also have some beach front property for saile in West Texas

 

Iron

I am sure I have experienced parasitic osc, but never identified it in practice before.  As for passing EMI I have experienced issues in passing Class B.  Class A designed that I worked on require only an addition of ferrite ring on cabling inside the unit.

Iron

The same scheme you showed yesterday

Iron

I once had parasitic oscillations burn a two mm hole in the top of a TO-3 MOSFET.  It was in a portable induction heater system.

Iron

Have had these kind of issues, and have had use several techniques changing switching time and in cases were the electronics could not be changed added the ferrite beads to stragic points.

Iron

What Power Losses ranges are acceptable?

Iron

We're now on slide nine.

Blogger

no experience with parasitic losses, the power control for our designs is static.

Iron

I got called in to fix a FET motor drive once. It had oscillations.  The gate drive traces were long and thin. Making them short and wide reduced the series inductance which helped a lot.

Iron

L & C Filters on output drive lines

 

has not been an issue so far

Iron

Can you damp the ringing with a small cap across the motor?

Oh yes....... but I didn't think of that parasitic oscillation.

Iron

We're now on slide eight.

Blogger

I have no prior experience with these designs.

Iron

Paul's question:

 

Have you experienced paracitic oscillations in your designs, and what did you do about it?

Blogger

@Zwilrich, why don't we make wire out of MOSFETs? hee hee.

Gold

We're now on slide seven.

Blogger

To put the 2.5 milli-ohms into perspective, that's roughly the same as 3 inches of 20 AWG copper wire.

Iron

We're now on slide six.

Blogger

 Yes, Paul is going to correct the typo.

Blogger

Typo on slide 4? 0.025 should be 0.0025.

Iron

We're now on slide five.

Blogger

We're now on slide four.

Blogger

Aloha, vmalan. I lived in Honolulu for 22 years.

Gold

hello from Shrewsbury PA

We're now on slide three.

Blogger

good afternoon, everyone

Iron

We're now on slide two.

Blogger

Audio is live! And away we go!

Iron

Hi all -Audio is live! If you don't see the audio bar at the top of the screen, please refresh your browser. It may take a couple tries. When you see the audio bar, hit the play button. If you experience audio interruptions and are using IE, try using FF or Chrome as your browser. Many people experience issues with IE. Also, make sure your flash player is updated with the current version. Some companies block live audio streams, so if that is the case for your company, the class will be archived on this page immediately following the class and you can listen then. People don't experience any issues with the audio for the archived version.

We saw a momma black bear with three cubs fishing for salmon yesterday

We're about to start.

Blogger

Sacramento California checking in.

Iron

Hello, is this about to start?

Iron

hello from Mishawaka

On Tuesday someone asked about the Vds available for fet. Digikey has a fet selector chart that lists 4500 v for a small number of products. Is there anything to keep in mind when using these high voltages like isolation of the gate driver or keeping these voltages separate and or  floating? 

Iron

@jondaddio, I'm in Montana. I didn't realize you southerners in Albuquerque had bears.

Gold

Here's a photo (not by me) of the bear: <http://interactives.krqe.com/photomojo/gallery/8297/165438/bears-seen-captured-in-albuquerque/on-the-lookout/>

Iron

Good morning from California!

Iron

hello all from Edmonton, Alberta

Iron

Hi from Midland Tx, actually got some rain today

Iron

Hello from Albuquerque.  No bears in my backyard but one was captured in my neighborhood.

Iron

Good morning from SurfCity, USA

Iron

Hi from Chihuahua, Mexico

Iron

-The streaming audio player will appear on this web page when the show starts at 2 PM Eastern time today. Note however that some companies block live audio streams. If when the show starts you don't hear any audio, try refreshing your browser. If that doesn't work, try using Firefox or Google Chrome as your browser. Some users experience audio interruptions with IE. If that doesn't work, the class will be archived immediately following our live taping.

Blogger

Hello from Albuquerque. We've had a bear (the proof is footprints at this point; setting up a critter cam) coming into our back yard over the past week getting into bird food and hummingbird feeders.

Iron

Greetings from Colorado Springs.  'Tis a wonderful Wednesday - yes??

Iron

Good Morning everyone.

Iron

One concept I have seen that prevents overlap shoot-through is to use a triangle wave to trigger the forward and reverse pair of FETs. A DC offset is increased to move more of the triangle above the trigger voltage of the Forward FETs, thus increasing the duty cycle.  The triangle wave is moved downward by lowering the DC offset and moving more of the triangle into the Reverse FETs.  The difference in Forward and Reverse trigger voltages is greater than the P-P voltage of the triangle wave, thus the waveform can never trigger both pairs of FETs at once.  Any other schemes to share?

Gold

Yes, vsrollins and mark.browne, my post got dropped, too.

Gold

Hello from the south, Huntsville, AL.

Iron

Hello from SE Lake SImcoe Ontario Canada.

Iron

Greetings from the garden spot of the universe: Minneapolis Minnesota.

And VSRollins - this is the second post as my first one was dropped.

Anyone else getting posts dropped?

Iron

-Be sure to click 'Today's Slide Deck' under Special Educational Materials above right to download the PowerPoint for today's session.

Blogger

-Please join our Digi-Key Continuing Education Center LinkedIn Group at http://linkd.in/yoNGeY

Blogger

-Be sure to follow @designnews and @DigiKeyCEC on Twitter for the latest class information. We encourage you to tweet about today's class using the hashtag #CEC.

Blogger

Hi from Albuquerque, New Mexico, home of Walter White.

Blogger

Morning from Portland Oregon

Iron

Good morning from Mobile, AL

Good morning from sunny NY.

Iron

Looking forward to practical insights .



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