Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Power unused circuits off: should power grounds be switched?
Power unused circuits off: should power grounds be switched?
Power unused circuits off: should power grounds be switched? Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 21st November 2019, 06:49 AM   #31
zgtc is offline zgtc  Europe
diyAudio Member
 
zgtc's Avatar
 
Join Date: Nov 2016
Location: Barcelona
Power unused circuits off: should power grounds be switched?
All the DC vs AC relays is super interesting, thank you.

I would like to come back to the finding in post 20 of AP22815BWT-7 power switch as a candidate replacement of a relay:
Quote:
Originally Posted by zgtc View Post
I might've found a way to avoid relays, using a power switch per each optional rail, at least for the 5V@3A. For instance, AP22815BWT-7. If I'm not mistaken this chip accepts a Input Voltage Range of 3.0V ~ 5.5V, and has an Enable input that acts as the switcher. It even has Overcurrent, Short-Circuit and Thermal Protection, Output Reverse-Voltage/Current Protection, Undervoltage Lockout etc. The EN feature is described as:

ON/OFF Input Operator
The EN input allows the output current to be switched on and off using a GPIO compatible input. The high signal (switch on) must be at least 1.2V and the low signal (switch off) no higher than 0.4V. This pin should not be left floating. It is advisable to hold the EN signal low when applying or removing power

Would anyone here please confirm this is a valid approach or I'm completely nuts? If this is valid, I'd need to find a similar product for +12V and for -12V rails.
Thank you so much
Attached Images
File Type: png 3F522870-B232-49D1-95E5-4939ADB12E10.png (28.2 KB, 28 views)
File Type: png 16EB7F4C-554B-4E2D-A92E-95C90246EADF.png (78.6 KB, 30 views)
  Reply With Quote
Old 21st November 2019, 01:29 PM   #32
zgtc is offline zgtc  Europe
diyAudio Member
 
zgtc's Avatar
 
Join Date: Nov 2016
Location: Barcelona
Power unused circuits off: should power grounds be switched?
Jean-Paul,

Quote:
Originally Posted by jean-paul
A drawing says way more than words.
Quote:
Originally Posted by zgtc View Post
I will try to do a basic scheme later tonight.
Here's the drawing. I don't think we need a super details proper schematics at this points.

Please see my previous message with a possible alternative to latching relays, using the AP22815BWT-7 power switch.

Thank you
Attached Images
File Type: png power-switch.png (530.8 KB, 30 views)
  Reply With Quote
Old 22nd November 2019, 09:10 AM   #33
Vovk Z is offline Vovk Z  Ukraine
diyAudio Member
 
Join Date: Oct 2011
Location: Kyiv
Power unused circuits off: should power grounds be switched?
Main "Isolated DC-DC" power unit will be on all time? So I dont see reason to use relay, but you can use just mosfet (for example - P-mosfet). May be there is some low-level (logic-level), I don't know exact popular part number right now. AO3401?

Last edited by Vovk Z; 22nd November 2019 at 09:15 AM.
  Reply With Quote
Old 22nd November 2019, 09:30 AM   #34
zgtc is offline zgtc  Europe
diyAudio Member
 
zgtc's Avatar
 
Join Date: Nov 2016
Location: Barcelona
Power unused circuits off: should power grounds be switched?
Quote:
Originally Posted by Vovk Z View Post
Main "Isolated DC-DC" power unit will be on all time? So I dont see reason to use relay, but you can use just mosfet (for example - P-mosfet). May be there is some low-level (logic-level), I don't know exact popular part number right now. AO3401?
Hi, yes, isolated DC-DC will be ON all the time. I will investigate on using mosfets, thank you. Any circuit you know I can look at?
  Reply With Quote
Old 22nd November 2019, 02:31 PM   #35
Vovk Z is offline Vovk Z  Ukraine
diyAudio Member
 
Join Date: Oct 2011
Location: Kyiv
Power unused circuits off: should power grounds be switched?
I haven't exact circuit. When I needed recently something like that I googled "p-mosfet switch".
  Reply With Quote
Old 22nd November 2019, 03:36 PM   #36
zgtc is offline zgtc  Europe
diyAudio Member
 
zgtc's Avatar
 
Join Date: Nov 2016
Location: Barcelona
Power unused circuits off: should power grounds be switched?
Hi again,

I'm just reading about using transistors. Apparently, the proper way to triggering a power circuit on/off through an Arduino signal is by using a P-Channel MOSFET as the switching transistor with a NPN transistor driver for that P-Channel. See NPN-PNP Driver Example section, from the baldengineer site, where I got the attachment capture from.

Also learnt from baldengineer that in theory there are off-the-shelf components called power switch or load switch, which basically would be ICs with the P-Channel MOSFET and a built-in NPN driver. Haven't found any in mouser though (or if I did, when reading the datasheet, I cannot find the explicit reference to the driver).

Also was having a look at this video Using PNP Bipolar Transistors with Arduino, from min 8:15 you'll see 3 circuits for the same purpose (one as the attachment, 2 a bit more complex, using Darlingtons).

I will keep reading.
Thank you again
Attached Images
File Type: png NPN-PNP Driver.png (208.0 KB, 12 views)
  Reply With Quote

Reply


Power unused circuits off: should power grounds be switched?Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
signal after power switched off rettedm Solid State 13 6th August 2014 07:09 AM
Switched power supplies better sometimes? lorienblack Power Supplies 5 4th January 2014 09:06 PM
power but not switched on? redrooster Solid State 0 14th August 2010 02:59 PM
Switched mode power supply MMicke Car Audio 3 19th February 2005 11:42 AM
Switched power supply? Johan_Ch Tubes / Valves 38 31st January 2004 12:53 PM


New To Site? Need Help?

All times are GMT. The time now is 09:06 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki