Anyone have experience with photo thyristors?
How well do they work? Cautions? Suggestions?
...Jim Thompson
-- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at
Buy a Fiarysler with your tax credit... Ignore that grinding noise, that is normal :-)
"Jim Thompson" wrote in message news: snipped-for-privacy@4ax.com...
I used KMOC3022 for switching in a home telephone exchange hobby project and they worked very well:
... and the TLP3043 zero-crossing type.
Used LASCRs *decades* ago.
AFAIK, they're pretty much dead as individual components. They live on in some optocouplers.
Cautions? As with all thyristors watch max dv/dt at high temperature and turn-off characteristics. Can't think of anything unusual. If it's a triac driver you probably want to be sure you don't drive it asymmetrically under any conditions 'cause that will put DC into the source and load-- in case those might be transformers or whatever.
Best regards, Spehro Pefhany
-- "it\'s the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com
I haven't seen one in ages. Do remember seeing a construction article in Popular Electronics (or was it EI?) using one to trigger a slave photoflash.
Like other SCRs, they turn off slow. Unlike other SCRs, they turn ON quite fast, because the active area of the photon reception can be as big as the SCR. Of all SCR types, these have the highest dI/dt limit.
Big SCRs are available, but big photoSCRs might be hard to purchase... there are some export restrictions and suchlike involved.
I found a way to avoid needing them. See Nagle's LTspice inductor modeling thread (Model 15 Teletype hammer driver).
...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC\'s and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
Stormy on the East Coast today... due to Bush\'s failed policies.
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