Language: 
To browser these website, it's necessary to store cookies on your computer.
The cookies contain no personal information, they are required for program control.
  the storage of cookies while browsing this website, on Login and Register.

GDPR and DSGVO law

Storing Cookies (See : http://ec.europa.eu/ipg/basics/legal/cookies/index_en.htm ) help us to bring you our services at overunity.com . If you use this website and our services you declare yourself okay with using cookies .More Infos here:
https://overunity.com/5553/privacy-policy/
If you do not agree with storing cookies, please LEAVE this website now. From the 25th of May 2018, every existing user has to accept the GDPR agreement at first login. If a user is unwilling to accept the GDPR, he should email us and request to erase his account. Many thanks for your understanding.
Amazon Warehouse Deals ! Now even more Deep Discounts ! Check out these great prices on slightly used or just opened once only items.I always buy my gadgets via these great Warehouse deals ! Highly recommended ! Many thanks for supporting OverUnity.com this way.

User Menu

Tesla Paper

Free Energy Book

Get paid

Donations

Please Donate for the Forum.
Many thanks.
Regards, Stefan.(Admin)

A-Ads

Powerbox

Smartbox

3D Solar

3D Solar Panels

DC2DC converter

Micro JouleThief

FireMatch

FireMatch

CCKnife

CCKnife

CCTool

CCTool

Magpi Magazine

Magpi Magazine Free Rasberry Pi Magazine

Battery Recondition

Battery Recondition

Arduino

Ultracaps

YT Subscribe

Gravity Machines

Tesla-Ebook

Magnet Secrets

Lindemann Video

Navigation

Products

Products

WaterMotor kit

Statistics


  • *Total Posts: 894454
  • *Total Topics: 15730
  • *Online Today: 44
  • *Most Online: 103
(December 19, 2006, 11:27:19 PM)
  • *Users: 6
  • *Guests: 8
  • *Total: 14

Author Topic: Reliable and Flexible Switching System  (Read 41194 times)

Offline lost_bro

  • Sr. Member
  • ****
  • Posts: 282
    • youtube channel
Re: Reliable and Flexible Switching System
« Reply #30 on: April 29, 2014, 02:17:08 AM »
An IGBT with a 1us turn off time isn't going to do very well hard switching at 7MHz.

Hello All:

Personally, for what it is worth, If I was designing something new I would try to use the cutting edge technology.

I would design the MOSFET driver stage to handle the higher required gate voltage of the NEW SiC MOSFETs.

Specifically I would incorporate the  C2M0080120D Silicon Carbide Power  Z-FET (N-Channel Enhancement Mode)  MOSFET.

PLease see attachment:

Td(on)=12ns
Td(off)=23.2ns
Trise   =13.6ns
Tfall    =18.4ns
Ciss   =950pf 

So the total Input capacitance is 5150pf/950pf= 5.421 x LESS than the H5N3003P MOSFET mentioned earlier.

This equates to less time spent in the Miller plateau when charging the discharging the gate so less heat generated and a faster overall pulse cycle is possible, not to mention the superior thermal characteristics. 

Forgot to mention that the Trr (body diode) = 40ns, pretty damn fast for an integral body diode......

And the D-S breakdown voltage is 1.2KV........


take care, peace
lost_bro



Free Energy | searching for free energy and discussing free energy

Re: Reliable and Flexible Switching System
« Reply #30 on: April 29, 2014, 02:17:08 AM »

Offline MarkE

  • Hero Member
  • *****
  • Posts: 6830
Re: Reliable and Flexible Switching System
« Reply #31 on: April 29, 2014, 02:52:31 AM »
Hello All:

Personally, for what it is worth, If I was designing something new I would try to use the cutting edge technology.

I would design the MOSFET driver stage to handle the higher required gate voltage of the NEW SiC MOSFETs.

Specifically I would incorporate the  C2M0080120D Silicon Carbide Power  Z-FET (N-Channel Enhancement Mode)  MOSFET.

PLease see attachment:

Td(on)=12ns
Td(off)=23.2ns
Trise   =13.6ns
Tfall    =18.4ns
Ciss   =950pf 

So the total Input capacitance is 5150pf/950pf= 5.421 x LESS than the H5N3003P MOSFET mentioned earlier.

This equates to less time spent in the Miller plateau when charging the discharging the gate so less heat generated and a faster overall pulse cycle is possible, not to mention the superior thermal characteristics. 

Forgot to mention that the Trr (body diode) = 40ns, pretty damn fast for an integral body diode......

And the D-S breakdown voltage is 1.2KV........


take care, peace
lost_bro
Those are very nice FETs if you are building something like a DC - AC inverter.  If the task is higher current at lower voltage, then they would not be the best choice.

Offline EMJunkie

  • Hero Member
  • *****
  • Posts: 3319
Re: Reliable and Flexible Switching System
« Reply #32 on: April 29, 2014, 03:14:42 AM »
Hi All,

Ok The First Poll Results:

Quote
Do you think a Reliable and Flexible Switching System is a good idea for all to have access to?
Yes                                                <-- Clear Winner 10/10 said yes.
No
Maybe
Too Dangerous for some

Everyone to date agrees this is an important issue and needs a solution.

Please vote for the Microcontroller of your choice. If you have another suggestion please let me know. Remember we are looking the best features for the best price!

All the Best

  Chris

Free Energy | searching for free energy and discussing free energy

Re: Reliable and Flexible Switching System
« Reply #32 on: April 29, 2014, 03:14:42 AM »
Sponsored links:




Offline lost_bro

  • Sr. Member
  • ****
  • Posts: 282
    • youtube channel
Re: Reliable and Flexible Switching System
« Reply #33 on: April 29, 2014, 03:38:44 AM »
Those are very nice FETs if you are building something like a DC - AC inverter.  If the task is higher current at lower voltage, then they would not be the best choice.

Hello MarkE

Well then I believe we have to agree on the task......
How LOW of a voltage and how HIGH of a current?

How much current *should* an O.U. device have to switch?

Usually when dealing with D.S. or S.M. devices, my biggest problem has been to switch *High* voltage , not current.

ie: EMF generated from inductor switching can give very *high* voltage spikes.......

These SiC can be paralleled very easily for higher current if need be, and have *almost*  unmatched switching speeds and one of the fastest body diodes available.... and better thermal characteristics then most lower voltage mosfets and Avalanche rated.

....they cost more and driver design is more involved than required for the garden variety MOSFET .

Maybe designing different *Driver Modules* that can be interchanged easily would be the solution.  I for one would want to continue using my SiC MOSFETs!

take care, peace
lost_bro

Offline Dog-One

  • Hero Member
  • *****
  • Posts: 763
Re: Reliable and Flexible Switching System
« Reply #34 on: April 29, 2014, 04:07:02 AM »
I may be a tad bit getting ahead of myself, but suppose we added the capability of an oscilloscope/spectrum analyzer here...

Then we would open the door to a fully self optimizing control system.  Imagine connecting this thing to whatever kind of Akula0083 inductor you have available and the system self-tunes.  All we would need are the libraries and the tuning process, code it up and let'r run.


M@

Free Energy | searching for free energy and discussing free energy

Re: Reliable and Flexible Switching System
« Reply #34 on: April 29, 2014, 04:07:02 AM »
Sponsored links:




Offline MarkE

  • Hero Member
  • *****
  • Posts: 6830
Re: Reliable and Flexible Switching System
« Reply #35 on: April 29, 2014, 04:08:18 AM »
Hello MarkE

Well then I believe we have to agree on the task......
How LOW of a voltage and how HIGH of a current?

How much current *should* an O.U. device have to switch?

Usually when dealing with D.S. or S.M. devices, my biggest problem has been to switch *High* voltage , not current.

ie: EMF generated from inductor switching can give very *high* voltage spikes.......

These SiC can be paralleled very easily for higher current if need be, and have *almost*  unmatched switching speeds and one of the fastest body diodes available.... and better thermal characteristics then most lower voltage mosfets and Avalanche rated.

....they cost more and driver design is more involved than required for the garden variety MOSFET .

Maybe designing different *Driver Modules* that can be interchanged easily would be the solution.  I for one would want to continue using my SiC MOSFETs!

take care, peace
lost_bro
I like SiC MOSFETs, they are killer for DC-AC inverter, and vector controlled motor drive designs.  But they are not what I would use for a 100V design.  You should never have to deal with spikes more than 4X Vcc.  I see a lot of people designing stuff where they put a diode around the MOSFET.  That doesn't protect the MOSFET.  When the MOSFET turns off, an inductive load will flyback, always increasing the drain to source voltage.  A properly designed clamp redirects the current typically limiting the voltage to no more than Vcc*2, but in some cases such as in some resonant designs:  4X Vcc.  A lot of the "magic" is in understanding how to do the circuit board layout to minimize stray inductance in the switching loop.

The amount of gate charge that is required depends on the die size and number of devices.  If we just parallel parts then we throw more and more power away at getting the devices to switch.  All high efficiency power converters I am familiar with carefully choose the power switching and energy storage components according to the intended load.  The switch voltage and current rating should be reasonable for the task.  What might be helpful is to come up with as simple and  low cost a board as possible that just has the driver, the switch and any monitoring circuits without the isolation components.  That would plug into a board that has the isolation components.  Then you could have several different incarnations of that simple board using components that are well matched to a reasonably narrow range of specifications.  The trick is to do that in a way that people can work with these things and still keep the inductance down.

Offline EMJunkie

  • Hero Member
  • *****
  • Posts: 3319
Re: Reliable and Flexible Switching System
« Reply #36 on: April 29, 2014, 04:26:59 AM »
Maybe designing different *Driver Modules* that can be interchanged easily would be the solution.  I for one would want to continue using my SiC MOSFETs!

Hey Lost_Bro,

Agree Fully! Make it as flexible as possible! Imagine the idea, Plug N' Play FET Slot for easy swap outs of FET's! I think the TO247 Package for the best range of High Speed FET's. We could use a 3 Pin Terminal Block if we had to!

@Dog-One,

I agree. Terminals for easy connection of Scope Probes for Oscilloscope and Spectrum Analyser is really important too!

@MarkE
Quote
What might be helpful is to come up with as simple and  low cost a board as possible that just has the driver, the switch and any monitoring circuits without the isolation components.  That would plug into a board that has the isolation components.

For sure this is a good idea! Even a board that has all the driver Circuits up to the isolation barrier! Then we could have a Plugin board for the switching and we could have as many as one needs of these with different FET's for different Jobs and vice versa for the Driver Circuits!

Problem is this would start getting more expensive the more boards that would need to be used. Most people are doing it tough on the money front and if this is to be a success, we need to do the best we can to keep the cost down!

All the Best

  Chris

P.S: If we have 100 people all join this movement and want a board it will make this much cheaper than 5 or 6. Common Lurkers, Join the party!

Free Energy | searching for free energy and discussing free energy

Re: Reliable and Flexible Switching System
« Reply #36 on: April 29, 2014, 04:26:59 AM »
Sponsored links:




Offline lost_bro

  • Sr. Member
  • ****
  • Posts: 282
    • youtube channel
Re: Reliable and Flexible Switching System
« Reply #37 on: April 29, 2014, 04:54:10 PM »
  A lot of the "magic" is in understanding how to do the circuit board layout to minimize stray inductance in the switching loop.

..... carefully choose the power switching and energy storage components according to the intended load.  The switch voltage and current rating should be reasonable for the task.  What might be helpful is to come up with as simple and  low cost a board as possible that just has the driver, the switch and any monitoring circuits without the isolation components.  That would plug into a board that has the isolation components.  Then you could have several different incarnations of that simple board using components that are well matched to a reasonably narrow range of specifications.  The trick is to do that in a way that people can work with these things and still keep the inductance down.

Well I agree, in as much as everyone will have a *different* end use for the device, we must work out a *buildable modular* type system that will accommodate a range of different MOSFETs while keeping an integrated Low stray inductance design of the *switching loop*.

What type of isolation components do you recommend?  Are we talking optos or emulators?

Do we use an integrated mosfet driver with active miller clamping?   What about a driver with integrated schmidt trigger waveform shaping?  pro, cons anyone?

What's the max. frequency we are shooting for?

I think a design for a double ended GDT driver would make a great modular board option.

take care, peace
lost_bro



 

Offline EMJunkie

  • Hero Member
  • *****
  • Posts: 3319
Re: Reliable and Flexible Switching System
« Reply #38 on: April 29, 2014, 11:48:44 PM »
Hi All,

I am going to share a Circuit that Is NOT mine Its the next step to the Circuit I posted in the first post.

Its from a friend of mine. I can not guarantee this is complete and or working.

However, this is what My Unit is based on in my original post. Its works very well, in fact I have not had a single issue with it!

Its an independently Driven H-Bridge, meaning each FET is switched individually from the Micro Controller.

All the Best

  Chris

Free Energy | searching for free energy and discussing free energy

Re: Reliable and Flexible Switching System
« Reply #38 on: April 29, 2014, 11:48:44 PM »
3D Solar Panels

Offline avalon

  • Full Member
  • ***
  • Posts: 160
Re: Reliable and Flexible Switching System
« Reply #39 on: April 30, 2014, 12:46:07 AM »
Hi MarkE,

I agree! Choosing the best components for the job is essential!

I have used: 5N3003
Turn-On Delay Time: 60ns
Turn-Off Delay Time: 220ns

So far this is one of my favourite N Channel MOSFET's!

All the Best

  Chris

Have a look at this...


~A

Offline avalon

  • Full Member
  • ***
  • Posts: 160
Re: Reliable and Flexible Switching System
« Reply #40 on: April 30, 2014, 12:49:30 AM »
Hello All:

Personally, for what it is worth, If I was designing something new I would try to use the cutting edge technology.

I would design the MOSFET driver stage to handle the higher required gate voltage of the NEW SiC MOSFETs.

Specifically I would incorporate the  C2M0080120D Silicon Carbide Power  Z-FET (N-Channel Enhancement Mode)  MOSFET.

lost_bro

Could agree more.

~A

Free Energy | searching for free energy and discussing free energy

Re: Reliable and Flexible Switching System
« Reply #40 on: April 30, 2014, 12:49:30 AM »
3D Solar Panels

Offline lost_bro

  • Sr. Member
  • ****
  • Posts: 282
    • youtube channel
Re: Reliable and Flexible Switching System
« Reply #41 on: April 30, 2014, 01:08:03 AM »
Have a look at this...


~A

Hi Avalon

Yes, notice that all the High-speed applications use Surface Mount Technology.... Of course!!!

I personally find it difficult to solder the small SMD type components by hand... 

What do we do about this?

Do we source out the production to a Chinese PCB manufacturer who can populate the pcbs with SMD at the same time?

Just a thought...

take care, peace
lost_bro

Offline avalon

  • Full Member
  • ***
  • Posts: 160
Re: Reliable and Flexible Switching System
« Reply #42 on: April 30, 2014, 01:31:45 AM »
Also, while we are on the subject, consider this as well...

Use it with IXDD415 and the result could be quite awesome.

~A

Offline avalon

  • Full Member
  • ***
  • Posts: 160
Re: Reliable and Flexible Switching System
« Reply #43 on: April 30, 2014, 01:34:59 AM »
Hi Avalon

I personally find it difficult to solder the small SMD type components by hand... 

What do we do about this?


Not easy indeed.
I use my 898D+ for that. It requires a bit of practice but it is doable.

~A

Offline EMJunkie

  • Hero Member
  • *****
  • Posts: 3319
Re: Reliable and Flexible Switching System
« Reply #44 on: April 30, 2014, 01:37:10 AM »
Also, while we are on the subject, consider this as well...

Use it with IXDD415 and the result could be quite awesome.

~A

Hey Avalon,

Nice unit but the RDS on is 1.6 Ohm we need a way lower RDS on 1.6 mOhm maybe.

All the Best

  Chris

 

OneLink