has anyone built an electric fence energizer using battery in parallel with a capacitor, pwm oscillator, dc-ac buck converter and ignition coil?
May I see your circuit diagram?The one i just put together uses a 8 pin pic, outputs a single pulse every second to an automotive waste-spark ignition coil.
The copy I had on a thumb-drive appears to have been wiped, but it is very simple a 12f628, 78L05, 5v gate drive Mosfet, and a waste spark coil.May I see your circuit diagram?
I will wire it to the output of my 12v scc.How will you charge the battery?
I have no idea how to build using those. Hope you can find it but thanks anyway!The copy I had on a thumb-drive appears to have been wiped, but it is very simple a 12f628, 78L05, 5v gate drive Mosfet, and a waste spark coil.
The primary was driven with a couple of 10ms pulses every 1 second.
For better reliability I would eliminate the relay and change U1 to a higher voltage/current MOSFET with a high voltage Zener drain-gate for protection, to directly drive the coil.Designed this version a few years ago for our farm in RSA, works OK.
I was more concerned about mechanical failure of the relay, not contact failure, as mechanical relays have a rated operational lifetime, typically in the neighborhood of a million cycles or so.When you consider a 1/sec rate and the coil/contacts/cap are from a motor vehicle, where the distributor is running at a few thousand sparks/min, they last a few years in the vehicle.
No not now, but where I grew up on a dairy farm in Wisconsin the cattle were free to roam in the pasture day and night.You are obviously not a small stock farmer, the fences are not run 24/7, they are only energised to keep our livestock off certain areas of ground, or straying during daylight hours.
During the night, the animals are housed in their respective safe lock up buildings.
Never thought the number of operations a relay can make before failure was.It's not rocket science.
I imagine getting zapped on the nose is not something they want to repeat.So far the night camera has proved it works well.
Put it this way, They were not impressed, !I imagine getting zapped on the nose is not something they want to repeat.
... nor amused, I'm willing to bet ...Put it this way, They were not impressed, !