Hello,
i am slowly charging a capacitor and when it reaches a voltage level of
18 Volts, i want to dump the capacitor charge into a battery with a TRIAC.
My approach is to use as minimal components as possible.
I know it could be easily done with a 555 timer etc. but the challenge is
to control the TRIAC firing with the voltage level on the capacitor.
I have not found a solution like that in the web.
So i am looking for brain-storm help to realize this.
I was thinking to use a zener diode of 15 Volt rating sort of like a switch.
The problem that i am seeing is that once the zener conducts, the capacitor
will discharge itself through that path and drop in voltage and drive the zener
out of the conductive state BEFORE the current becomes high enough (30 mA) to create the gate impulse for the TRIAC.
A schematic to illustrate that:
**broken link removed**
I plan to use an optocoupler to trigger the TRIAC.
All i need is to get the TRIAC to fire somehow when the cap voltage is 18V.
Maybe there is a more elegant solution?
I would really appreciate some ideas on how to tackle this.
Thanks a lot
i am slowly charging a capacitor and when it reaches a voltage level of
18 Volts, i want to dump the capacitor charge into a battery with a TRIAC.
My approach is to use as minimal components as possible.
I know it could be easily done with a 555 timer etc. but the challenge is
to control the TRIAC firing with the voltage level on the capacitor.
I have not found a solution like that in the web.
So i am looking for brain-storm help to realize this.
I was thinking to use a zener diode of 15 Volt rating sort of like a switch.
The problem that i am seeing is that once the zener conducts, the capacitor
will discharge itself through that path and drop in voltage and drive the zener
out of the conductive state BEFORE the current becomes high enough (30 mA) to create the gate impulse for the TRIAC.
A schematic to illustrate that:
**broken link removed**
I plan to use an optocoupler to trigger the TRIAC.
All i need is to get the TRIAC to fire somehow when the cap voltage is 18V.
Maybe there is a more elegant solution?
I would really appreciate some ideas on how to tackle this.
Thanks a lot