Replace relay "Omron G8MS-H30" by MOSFETs N_CHANNEL


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Phil76750
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Replace relay "Omron G8MS-H30" by MOSFETs N_CHANNEL

Postby Phil76750 » Tue Mar 01, 2016 12:16 pm



Hello everyone.
t is someone already interested in the replacement of relay (single contact) by a type of transistor 30A mosfet?
It seems to be easy enough to fit over the base relay control by mosfet. Are you already had trials?
Thank you


French:
Bonjour à tous.
quelqu'un s'est t'il déjà intéressé par le remplacement des relais (simple contact) par un transistor de type mosfet 30A ?
Il semble qu'il soit assez simple à adapter sur l'embase du relais une commande par mosfet. Y a t'il déjà eu des essais ?
Merci



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virgilmobile
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Re: Replace relay "Omron G8MS-H30" by MOSFETs N_CHANNEL

Postby virgilmobile » Tue Mar 01, 2016 1:46 pm

I am interested in the technology.
Do you know if there is any voltage drop/loss
Using this FET.
Example. Operating at 14 volts DC drawing 10 amp.
More than a 0.45 DC voltage drop may cause some problems.
Can the heat generated by the FET in a continuous duty cycle of 80% be dissipated within the size of the original relay case.
I do prefer electronic switching over mechanical contacts when possible.
What is the cost comparison.

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Re: Replace relay "Omron G8MS-H30" by MOSFETs N_CHANNEL

Postby WingAdmin » Tue Mar 01, 2016 2:29 pm

virgilmobile wrote:I am interested in the technology.
Do you know if there is any voltage drop/loss
Using this FET.
Example. Operating at 14 volts DC drawing 10 amp.
More than a 0.45 DC voltage drop may cause some problems.
Can the heat generated by the FET in a continuous duty cycle of 80% be dissipated within the size of the original relay case.
I do prefer electronic switching over mechanical contacts when possible.
What is the cost comparison.


Assuming the MOSFET is being used like a switch - i.e. 100% biased or 0% biased, there shouldn't really be any heat to dissipate. It's only when MOSFETs are partially biased that they generate heat.

I use MOSFETs in my "Bike PC" to control my heated gear, and even though they are controlling upwards of 10 amps each, they run without heatsinks. I use PWM to control the heat output, so the MOSFETs are running full on or full off - with instant switching between the two, so no heat generation.

Because of this, undervoltage protection would have to be incorporated, to prevent overheating should a low voltage (i.e. low battery) condition exist.

There are automotive MOSFET replay replacements available, I haven't seen one that would directly plug into the GL1500 however. An example: http://www.amazon.com/Hella-H41773001-S ... ingdocs-20

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Phil76750
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Re: Replace relay "Omron G8MS-H30" by MOSFETs N_CHANNEL

Postby Phil76750 » Wed Mar 02, 2016 11:15 am


Hello.
After some research, it seems that only the P_channel mosfet is usable.
For the price, about $ 4 count (EBAY.COM: 10pcs STP55NF06 P55NF06 Manu: ST Package: TO-220 60V 50A N-Channel Power MOSFET)

I turned the principle of relay 12v with a p_channel mosfet. When do you think ? 2 attachments.
It remains to find a goldwing relay base and to test ...
---------------------------------------------------------
Bonjour.
Après quelques recherche, il semble que seul le mosfet P_channel soit utilisable.
Pour le prix, compter environ 4 $ (EBAY.COM : 10pcs STP55NF06 P55NF06 Manu: ST Package: TO-220 60V 50A N-channel Power MOSFET)

J'ai transformé le principe du relais 12v par un mosfet p_channel. Quand pensez-vous ? les 2 pièces jointes.
Reste à trouver une embase relais goldwing et faire des essais...

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Re: Replace relay "Omron G8MS-H30" by MOSFETs N_CHANNEL

Postby WingAdmin » Thu Mar 03, 2016 3:14 pm

It has to be a P channel only because that's the only type that switches power rather than ground.

You're going to need some reverse load protection in that circuit, otherwise when you shut off the MOSFET connected to an inductive load and get a pulse coming back, the MOSFET is going to have a very short life.

You might want more than a 100nF cap in there to lower the upper limit of your LP filter - some of the relays in the bike are cascaded, so you need more capacitance to debounce the output of other relays.

You should also look at an undervoltage lockout circuit, to prevent the MOSFET from being biased if input voltage is below a certain amount. You don't want the MOSFET being partially biased because the bike's battery is low. Under heavy load, that could cook the MOSFET.

Lastly, you'll need some other protection for the MOSFET against static, spikes, surges and the other nastiness that you'll find on the power bus of a motorcycle (or car). MOSFETs are delicate when it comes to those things.

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Re: Replace relay "Omron G8MS-H30" by MOSFETs N_CHANNEL

Postby Phil76750 » Fri Mar 04, 2016 11:37 am

It all agree on precautions!
Will there be enough room to put these protections in a relay location? Out of curiosity, I will do some tests on smaller relays. It remains to find the right wiring diagram in 1500?
To be continued ....

Tout a fait d'accord sur les précautions à prendre !
Y aura t'il assez de place pour mettre ces protections dans un emplacement de relais ? Par curiosité, je vais faire quelques essais sur des relais de moindre importance. Reste à trouver le bon schéma électrique de la 1500 ?
A suivre ....




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