Given a power supply that needs 120 volts AC input, I'd like to use a
small front-panel power switch at some low voltage, not run the AC
line up to the front panel.
Do people make SSRs that would do that, accept a low-voltage switch
closure to switch AC?
Given a power supply that needs 120 volts AC input, I'd like to use a
small front-panel power switch at some low voltage, not run the AC
line up to the front panel.
Do people make SSRs that would do that, accept a low-voltage switch
closure to switch AC?
On 2024-09-11 8:08 p.m., john larkin wrote:
Given a power supply that needs 120 volts AC input, I'd like to use a
small front-panel power switch at some low voltage, not run the AC
line up to the front panel.
Do people make SSRs that would do that, accept a low-voltage switch
closure to switch AC?
Sure, there are the TRAIC SSR bricks that take 4 to 32VDC to switch -
and can handle tens of amps.
https://www.digikey.ca/en/products/filter/solid-state-relays-ssr/183?s=N4IgTCBcDaIIIGEAEAXATgSwIYGMQF0BfIA
And also the opto-isolated TRAICs like the MOC302x family from Lite-On.
Of course you need some power to enable that stuff to run - perhaps a >capacitor/resistor driven supply that sucks a tiny amount of current
from the power line to enable the drive circuit?
On 2024-09-11 8:08 p.m., john larkin wrote:
Given a power supply that needs 120 volts AC input, I'd like to use a
small front-panel power switch at some low voltage, not run the AC
line up to the front panel.
Do people make SSRs that would do that, accept a low-voltage switch
closure to switch AC?
Sure, there are the TRAIC SSR bricks that take 4 to 32VDC to switch -
and can handle tens of amps.
https://www.digikey.ca/en/products/filter/solid-state-relays-ssr/183?s=N4IgTCBcDaIIIGEAEAXATgSwIYGMQF0BfIA
And also the opto-isolated TRAICs like the MOC302x family from Lite-On.
Of course you need some power to enable that stuff to run - perhaps a >capacitor/resistor driven supply that sucks a tiny amount of current
from the power line to enable the drive circuit?
John :-#)#
Given a power supply that needs 120 volts AC input, I'd like to use a
small front-panel power switch at some low voltage, not run the AC
line up to the front panel.
Do people make SSRs that would do that, accept a low-voltage switch
closure to switch AC?
Given a power supply that needs 120 volts AC input, I'd like to use a
small front-panel power switch at some low voltage, not run the AC
line up to the front panel.
Do people make SSRs that would do that, accept a low-voltage switch
closure to switch AC?
Given a power supply that needs 120 volts AC input, I'd like to use a
small front-panel power switch at some low voltage, not run the AC
line up to the front panel.
Do people make SSRs that would do that, accept a low-voltage switch
closure to switch AC?
On Wed, 11 Sep 2024 21:55:57 -0700, John Robertson <jrr@flippers.com>
wrote:
On 2024-09-11 8:08 p.m., john larkin wrote:
Given a power supply that needs 120 volts AC input, I'd like to use a
small front-panel power switch at some low voltage, not run the AC
line up to the front panel.
Do people make SSRs that would do that, accept a low-voltage switch
closure to switch AC?
Sure, there are the TRAIC SSR bricks that take 4 to 32VDC to switch -
and can handle tens of amps.
https://www.digikey.ca/en/products/filter/solid-state-relays-ssr/183?s=N4IgTCBcDaIIIGEAEAXATgSwIYGMQF0BfIA
And also the opto-isolated TRAICs like the MOC302x family from Lite-On.
Of course you need some power to enable that stuff to run - perhaps a
capacitor/resistor driven supply that sucks a tiny amount of current
from the power line to enable the drive circuit?
John :-#)#
Yes, I'd need another isolated ACline power supply to make the drive
voltage for the SSR.
The alternative is to do what is common, have a giant power inlet
block on the back (IEC, emi, fuses, big switch) and run that into my
24 volt supply, and use the front-panel switch to enable the supply or
switch its output.
On 13/09/2024 12:45 am, john larkin wrote:
On Wed, 11 Sep 2024 21:55:57 -0700, John Robertson <jrr@flippers.com>
wrote:
On 2024-09-11 8:08 p.m., john larkin wrote:
Given a power supply that needs 120 volts AC input, I'd like to use a
small front-panel power switch at some low voltage, not run the AC
line up to the front panel.
Do people make SSRs that would do that, accept a low-voltage switch
closure to switch AC?
Sure, there are the TRAIC SSR bricks that take 4 to 32VDC to switch -
and can handle tens of amps.
https://www.digikey.ca/en/products/filter/solid-state-relays-ssr/183?s=N4IgTCBcDaIIIGEAEAXATgSwIYGMQF0BfIA
And also the opto-isolated TRAICs like the MOC302x family from Lite-On.
Of course you need some power to enable that stuff to run - perhaps a
capacitor/resistor driven supply that sucks a tiny amount of current >>>from the power line to enable the drive circuit?
John :-#)#
Yes, I'd need another isolated ACline power supply to make the drive
voltage for the SSR.
The alternative is to do what is common, have a giant power inlet
block on the back (IEC, emi, fuses, big switch) and run that into my
24 volt supply, and use the front-panel switch to enable the supply or
switch its output.
You could use a little generator - the EnOcean wireless wall switches do
that to avoid using a battery. When you press it, the mechanical energy
from your finger powers a tiny generator and powers the transmitter
(either Bluetooth or another standard).
If someone would package just the button part that does the generating, >leaving off the radio, it might well make enough power to turn on a SSR
for a cycle or two, which could then power the thing up properly.
john larkin <JL@gct.com> wrote:
Given a power supply that needs 120 volts AC input, I'd like to use a
small front-panel power switch at some low voltage, not run the AC
line up to the front panel.
Do people make SSRs that would do that, accept a low-voltage switch
closure to switch AC?
I think Piotr Wyderski posted a cool looking circuit using a small hf pulse >transformer as isolation and coupling. Shorting the isolated LV side loaded >or stopped an oscillator or something.
The 1960s GE SCR manual showed ways to do that too but using 50/60Hz >transformers which are now not cost effective.
On Thu, 12 Sep 2024 20:09:31 -0000 (UTC), piglet
<erichpwagner@hotmail.com> wrote:
john larkin <JL@gct.com> wrote:
Given a power supply that needs 120 volts AC input, I'd like to use a
small front-panel power switch at some low voltage, not run the AC
line up to the front panel.
Do people make SSRs that would do that, accept a low-voltage switch
closure to switch AC?
I think Piotr Wyderski posted a cool looking circuit using a small hf pulse >> transformer as isolation and coupling. Shorting the isolated LV side loaded >> or stopped an oscillator or something.
The 1960s GE SCR manual showed ways to do that too but using 50/60Hz
transformers which are now not cost effective.
Some people sell a small potted PCB-mount brick that's an AC-line
powered power supply. But I'd have to design a PCB and run line
voltage into it.
Some biggish universal-input metal-box power supplies have a
contact-closure enable input. May as well use one of those, even
thought I only need a few watts.
The product is a high-voltage pulse generator, probably a detonator or something. We don't know.
On Wed, 11 Sep 2024 21:55:57 -0700, John Robertson <jrr@flippers.com>
wrote:
On 2024-09-11 8:08 p.m., john larkin wrote:
Given a power supply that needs 120 volts AC input, I'd like to use a
small front-panel power switch at some low voltage, not run the AC
line up to the front panel.
Do people make SSRs that would do that, accept a low-voltage switch
closure to switch AC?
Sure, there are the TRAIC SSR bricks that take 4 to 32VDC to switch -
and can handle tens of amps.
https://www.digikey.ca/en/products/filter/solid-state-relays-ssr/183?s=N4IgTCBcDaIIIGEAEAXATgSwIYGMQF0BfIA
And also the opto-isolated TRAICs like the MOC302x family from Lite-On.
Of course you need some power to enable that stuff to run - perhaps a
capacitor/resistor driven supply that sucks a tiny amount of current
from the power line to enable the drive circuit?
John :-#)#
Yes, I'd need another isolated ACline power supply to make the drive
voltage for the SSR.
The alternative is to do what is common, have a giant power inlet
block on the back (IEC, emi, fuses, big switch) and run that into my
24 volt supply, and use the front-panel switch to enable the supply or
switch its output.
On Fri, 13 Sep 2024 21:17:02 +1000, Chris Jones
<lugnut808@spam.yahoo.com> wrote:
On 13/09/2024 12:45 am, john larkin wrote:
On Wed, 11 Sep 2024 21:55:57 -0700, John Robertson <jrr@flippers.com>
wrote:
On 2024-09-11 8:08 p.m., john larkin wrote:
Given a power supply that needs 120 volts AC input, I'd like to use a >>>>> small front-panel power switch at some low voltage, not run the AC
line up to the front panel.
Do people make SSRs that would do that, accept a low-voltage switch
closure to switch AC?
Sure, there are the TRAIC SSR bricks that take 4 to 32VDC to switch -
and can handle tens of amps.
https://www.digikey.ca/en/products/filter/solid-state-relays-ssr/183?s=N4IgTCBcDaIIIGEAEAXATgSwIYGMQF0BfIA
And also the opto-isolated TRAICs like the MOC302x family from Lite-On. >>>>
Of course you need some power to enable that stuff to run - perhaps a
capacitor/resistor driven supply that sucks a tiny amount of current >>>>from the power line to enable the drive circuit?
John :-#)#
Yes, I'd need another isolated ACline power supply to make the drive
voltage for the SSR.
The alternative is to do what is common, have a giant power inlet
block on the back (IEC, emi, fuses, big switch) and run that into my
24 volt supply, and use the front-panel switch to enable the supply or
switch its output.
You could use a little generator - the EnOcean wireless wall switches do >>that to avoid using a battery. When you press it, the mechanical energy >>from your finger powers a tiny generator and powers the transmitter
(either Bluetooth or another standard).
If someone would package just the button part that does the generating, >>leaving off the radio, it might well make enough power to turn on a SSR
for a cycle or two, which could then power the thing up properly.
Reminds me of an old telephone ringer magneto that I had as a kid. It
packed a pretty good shock.
How about a stepper motor with a knob? They make good generators.
Sysop: | Keyop |
---|---|
Location: | Huddersfield, West Yorkshire, UK |
Users: | 415 |
Nodes: | 16 (2 / 14) |
Uptime: | 160:57:14 |
Calls: | 8,707 |
Calls today: | 1 |
Files: | 13,270 |
Messages: | 5,951,461 |