Pages: [1] 2   Go Down
Author Topic: mosfet help  (Read 1236 times)
0 Members and 1 Guest are viewing this topic.
Offline Offline
Newbie
*
Karma: 0
Posts: 47
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

I have been told I need to use a mosfet to get this working with my arduino as it is controlled with 2-10v
http://uk.farnell.com/jsp/search/productdetail.jsp?CMP=cmwis_email&sku=1936419
I am new to electronics and would be grateful if any one could post a schematic to allow the arduino pwm pin to control this bit of kit, also a link to the farnell site to which mosfet to buy as there are so many different types. I understand I need a logic type.
Any help would be appreciated.
Logged

Offline Offline
Faraday Member
**
Karma: 66
Posts: 2568
Now, More Than Ever
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

You were misinformed.
All that it requires is a digital output pin, 0/5V.

*** The "2-10V" means that it's good with a minimum of 0/2V and as much as 0/10V.  So controlling it with 0/5V is a winner. ***
« Last Edit: February 25, 2012, 10:16:11 am by runaway_pancake » Logged

"Hello, I must be going..."
"You gotta fight -- for your right -- to party!"
Don't react - Read.
"Who is like unto the beast? who is able to make war with him?"

Offline Offline
Newbie
*
Karma: 0
Posts: 47
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Are you sure, looking at the data sheet it says this prportional controller will only give 50% power at 5v and 100% at 10v. Or am i reading it totally wrong.
Logged

Offline Offline
Faraday Member
**
Karma: 66
Posts: 2568
Now, More Than Ever
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

The link you provided is for a solid-state relay.
Its input is 2-10VDC, its output is rated for 240vac.
It's "on" when its input is anywhere between 2 and 10V; it's "off" when its input is 0V.
Logged

"Hello, I must be going..."
"You gotta fight -- for your right -- to party!"
Don't react - Read.
"Who is like unto the beast? who is able to make war with him?"

Offline Offline
Newbie
*
Karma: 0
Posts: 47
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

no it is a proportional controller here is a link to the data sheet.
http://www.crydom.com/en/Products/Catalog/p_cv.pdf
Logged

Offline Offline
Faraday Member
**
Karma: 66
Posts: 2568
Now, More Than Ever
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

OK
The link calls it an SSR, but its datasheet has it as a proportional controller.
So, it's different.
Logged

"Hello, I must be going..."
"You gotta fight -- for your right -- to party!"
Don't react - Read.
"Who is like unto the beast? who is able to make war with him?"

Offline Offline
Faraday Member
**
Karma: 66
Posts: 2568
Now, More Than Ever
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

So, you want/need a means of 0/5V (PWM?) to 0 to 10V variable?
Logged

"Hello, I must be going..."
"You gotta fight -- for your right -- to party!"
Don't react - Read.
"Who is like unto the beast? who is able to make war with him?"

Offline Offline
Newbie
*
Karma: 0
Posts: 47
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

yes please
Logged

Offline Offline
Newbie
*
Karma: 0
Posts: 47
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

OK
The link calls it an SSR, but its datasheet has it as a proportional controller.
So, it's different.

I think it is a proportional ssr
Logged

Offline Offline
Faraday Member
**
Karma: 66
Posts: 2568
Now, More Than Ever
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

I wonder if a PWM'ed 0/10V would suffice or if it requires a nice, smooth, 'constant' (within range) DC control voltage.
Logged

"Hello, I must be going..."
"You gotta fight -- for your right -- to party!"
Don't react - Read.
"Who is like unto the beast? who is able to make war with him?"

Offline Offline
Newbie
*
Karma: 0
Posts: 47
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

I wonder if a PWM'ed 0/10V would suffice or if it requires a nice, smooth, 'constant' (within range) DC control voltage.
im not sure, the data sheet just gives  d\c voltage to power charts
Logged

Offline Offline
Faraday Member
**
Karma: 66
Posts: 2568
Now, More Than Ever
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

It'd be easy enough to switch (PWM) a transistor, and therefore the controller's input, between 0 and 10V, especially since it's just LED current there.
Smoothing the Arduino PWM (approx 430Hz ?) with a low-pass filter and an op-amp and then amplifying the result (X2) would be more complicated, but hardly impossible.
Logged

"Hello, I must be going..."
"You gotta fight -- for your right -- to party!"
Don't react - Read.
"Who is like unto the beast? who is able to make war with him?"

Offline Offline
Newbie
*
Karma: 0
Posts: 47
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

It'd be easy enough to switch (PWM) a transistor, and therefore the controller's input, between 0 and 10V, especially since it's just LED current there.
Smoothing the Arduino PWM (approx 430Hz ?) with a low-pass filter and an op-amp and then amplifying the result (X2) would be more complicated, but hardly impossible.

can I have the easy option please as the other has gone straight over my head.
Logged

Offline Offline
Faraday Member
**
Karma: 66
Posts: 2568
Now, More Than Ever
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

OK.
Attached is a drawing for the first (easiest) option.
The transistor is just a "garden variety" NPN.

***  "Ordinary" SSRs need a load on the output - without a load the output will always show high-voltage (assuming use of a modern DVM) regardless the control state.  ***


* pcsw.JPG (7.68 KB, 329x273 - viewed 8 times.)
« Last Edit: February 25, 2012, 11:24:29 am by runaway_pancake » Logged

"Hello, I must be going..."
"You gotta fight -- for your right -- to party!"
Don't react - Read.
"Who is like unto the beast? who is able to make war with him?"

Offline Offline
Newbie
*
Karma: 0
Posts: 47
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

OK.
Attached is a drawing for the first (easiest) option.
The transistor is just a "garden variety" NPN.

***  "Ordinary" SSRs need a load on the output - without a load the output will always show high-voltage (assuming use of a modern DVM) regardless the control state.  ***

Excuse me for being a bit thick but is that a battery on the schematic?
Logged

Pages: [1] 2   Go Up
Jump to: