Drive pulses to TIP41 are about 30ms duration at one pulse per second. I am building a electric fence energizer with car ignition coil as HV transformer powering it from 12V battery and i am facing some problems with ignition coil secondary EMF causing HV spikes on primary when switching.
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A Small 100 mA Solar Panal would probably do this quite well.
. First understand commercial design and construction of electric fence controllers for agricultural use are bound by legislative rules that they must meet for safety. You can make a decent electric fence with a vehicle ignition coil. Mechanics will always tell you to never crank the engine with the plugs disconnected for fear of damaging the ignition coil.
The electric fence charger circuit presented here is basically a high voltage pulse generator. Im not recommending this but you could get a fence charger from the farm supply store and hook it up to your car. Its a 555 timer that pulses an ignition coil via a power transistor.
I am using two NE555 timers for PWM which switches mosfet irf840. This Electric Fence Should be powered by a 12 Volt Battery and this battery Should have a Trickle Charger on it. However because it is a Continuous HV Pulse Output This is the OLDER Typeof Car Coil that MUST be usedfor this Project.
A good Earth return is important add some protection against lightening strikes. Test elektricého ohradníku z indučky. Thanks to all for the answers.
If you are planning on using Q2 mosfet then you. Positive on coil to either post on turn signal relay. Whilst a car ignition coil can easily be used for electric fence purposes a lot depends on the length of fence as it is the energy content of the pulse that makes it effective or not.
Turn signal relay and keep it DRY to fence. There are rules for battery powered units and others for mains units. High Voltage Ignition Coil Supply.
FYI the ignition coil is the part that is actually turned on and off when you turn to key on in relation to the engine and its main job is to multiply the engergy from the 12 volt battery system so it can send a really hot spark to jump the gap on the spark plug thus igniting the airfuel ratio. Problem is that TIP41 gets hot enough to destroy itself after about 30 pulses. -- john hill johncndconz December 25 2001.
More at httpwwwmylmsczelektricky-ohradnik. Více na httpwwwmylmsczelektricky-ohradnikElectric fence test. Output voltage is limited by a 100V zener and standard diode opposed across the primary as suggested by TomG.
In this Instructable I will teach you how to. The super high voltage is derived from a commonly used automobile ignition coil. One very important thing is to earth the ignition coil near to where you will be using the electric fense.
It is a car ignition coil after all. 10 kV is the max voltage permitted 13 of that in an ignition system but a lot more energy excepting for those ignitions used in race and. Ignition coils dont like running open circuit as a fence would as the voltage peaks too high and damages the windings.
Coil resistance is 17 ohms as measured. Whilst a car ignition coil can easily be used for electric fence purposes a lot depends on the length of fence as it is the energy content of the pulse that makes it effective or not. The energy content is selectable.
Terminating the fence with a spark plug and Im guessing a non wire-wound 180 ohm resistor could work. Positive side of battery to positive on coil. I made a couple of these units for the farm in PE uses a 555 as timer and 12v relay for the driving the coil been operating now for about 5 years.
Connect rod to negative on battery then negative on battery to negative on coil. A Simple design based on a 555 to Drive a Car Ignition Coil. Occassional Cycle Charging a car battery or Sealed lead acid Battery is not a good idea THE CASE OF THE COIL SHOULD BE CONNECTED TO EITHER GROUND OR THE DIST.
Go to your local vehicle scrap yard and get a 12V coil the ballast resistor and the contact capacitor. Fence needs a ground- which is a rod set in the ground. Sheep are a real pain to keep contained with a electric fence all that wool and lanolin makes them a good insulator.
High Voltage Ignition Coil Supply. An astable multivibrator is used to generate the required frequency to drive the ignition coil. I am building an electric fence using a 12 volt battery to energise a NE555 timer to drive a TIP41C transistor into a car ignition coil.
A 4KV level will not be enough for sheep we use old 12V vehicle ignition coils pulsed at about 25KV use an old spark plug as a tester on our farm. DO NOT ATTEMPT TO USE THIS FOR AN ELECTRIC FENCE THIS CAN KILL PEOPLE AND ANIMALS. I used a 3 foot long copper bar hammered it into the ground near my fence and used a jubilee clip to attach the wire that goes to the ground of my coil without this it will not work.
Definately Makes a STRONG HV Output from a Car Coil. Still open to ideas on the primary side though. This homemade electric fence charger was created when wandering livestock caused crop losses includes information on the circuit board charger a detailed diagram and materials list and instructions.
Well if you want to go electric and since no one has mentioned it except you of course the easiest and cheapest way IS to use an old car ignition coil. Ok wiring would go as follows. Another astable is used to control the pulses supplied to the fence.
Heres a link to a schematic that I posted for someone else earlier. The question asked was for a simple electric fence charger using an ignition coil and that is what I have tried to do. The prototype klacked away in my garage for 24 hours with no sign of a problem.
08 Hz and 10 duty cycle. If you trying to find one on a junk car find the spark plug wires if 4 cylinder there will be four. There are plenty of electric fence using car ignition coil designs on the internet and the ignition coil can be obtained fairly cheaply from a local wrecker yard.
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