Sonsivri
 
*
Welcome, Guest. Please login or register.
Did you miss your activation email?
December 06, 2016, 09:11:16 09:11


Login with username, password and session length


Pages: [1]
Print
Author Topic: switching low voltage ac  (Read 1133 times)
0 Members and 1 Guest are viewing this topic.
joaler
Guest
« on: January 26, 2008, 12:43:45 12:43 »

dear friends

i know that i can use triacs (bta16 etc) to control the ACv
is there any such devises are available to control ACV of 9v/12v?
as we cannot use the bta 16 for low voltage
what all things should i take care
is there any schem available ?

thanking you

jo
Logged
Silent_Thunder
Junior Member
**
Offline Offline

Posts: 57

Thank You
-Given: 28
-Receive: 17



« Reply #1 on: January 26, 2008, 07:31:48 19:31 »

Hi Jo;
I think you could use 4016/4066, which is a Quad Analog Switch, this one allow you to digitally control an analogue switch, this chip contains 4 switches. please see the data sheet to know more.
I hope this meets your requirements.
Best regards
Logged
8K51
Junior Member
**
Offline Offline

Posts: 80

Thank You
-Given: 86
-Receive: 39


« Reply #2 on: January 26, 2008, 09:14:46 21:14 »

Hi
Please tel us :
-what kind of control you need (phase angle like dimmers ? on/off only ?)
-intensity value : How many A ?

According to your precise needs answers are not the same :
small relay, optotriac, 2 small thyristors, triac with pic, analog switches ......
(You can use triac based dimmer schematic if your replace diac by something else....working under 32V !!)

You say :
"as we cannot use the bta 16 for low voltage...."
When reading data sheet for this component I dont see why you could not use it for 9V/12V application if you respect minimal gate current(IGT) and voltage (VGT) to switch on and then holding current (IH) to stay 'on'. You have of course to compute new gate resistor value.
Regards


« Last Edit: January 26, 2008, 09:29:46 21:29 by 8K51 » Logged
joaler
Guest
« Reply #3 on: March 05, 2008, 02:34:15 14:34 »

dear friends

i want to on/off a solinoid which works on 12 vac and consumes about 500mA current
can i use the triac bta 16? or any other components are avilable for the same application
i am not so expert. so please forgive for the silly questions


thanking you

joaler
Logged
titi
Active Member
***
Offline Offline

Posts: 192

Thank You
-Given: 1434
-Receive: 705



« Reply #4 on: March 05, 2008, 07:12:53 19:12 »

Hello,

Yes, you can use BTA 16 to ON/OFF you solinoid with 12 VAC.
You need to have two power supply insulated, one for 12VAC and an other for the control.
Generally BTA 16 need a current of 10mA or more on Trigger to ON/OFF the BTA.
The resistor on the Trigger is calculate doing that : for VCC=5v by example, R=U/I so R=(5-0.6)/0.015=293 Ohms take 270 or 330 Ohms.
5=VCC, 0.6 is V Trigger, 0.015 is 15mA.

Best regards.
Logged
joaler
Guest
« Reply #5 on: March 07, 2008, 02:46:59 14:46 »

Dear friend
thank you for the reply
i will try this solution
if i can use bta 16, i can use other triacs (small size)also for the same application.
what is to be taken care when i am selecting a triac?
the terminal current flow?

regards

jo
 
Logged
titi
Active Member
***
Offline Offline

Posts: 192

Thank You
-Given: 1434
-Receive: 705



« Reply #6 on: March 07, 2008, 06:02:33 18:02 »

Hi,

Yes, you can use smaller triacs.
If you use small current Triacs, you can use higher value for the resistor on Trigger, because small Triacs are very sensitive.
For 500mA, a Triac 1A is Ok.
Take a minimum of 50v for the Triac, because when triacs became open the solenoid make an over-voltage due to inductive flow.
 
If you want only ON/OFF your solenoid, it is possible to use a simple relay, the contact of relay work in DC but in AC too.

Regards
Logged
Pages: [1]
Print
Jump to:  


DISCLAIMER
WE DONT HOST ANY ILLEGAL FILES ON THE SERVER
USE CONTACT US TO REPORT ILLEGAL FILES
ADMINISTRATORS CANNOT BE HELD RESPONSIBLE FOR USERS POSTS AND LINKS

... Copyright 2003-2999 Sonsivri.to ...
Powered by SMF 1.1.18 | SMF © 2006-2009, Simple Machines LLC | HarzeM Dilber MC