High voltage source from TDKS

Now it is very often possible to find outdated kinescopic TVs in the garbage bin, with the development of technology they are not relevant packs, therefore now they are mostly disposed of. Perhaps everyone saw on the back of such a TV inscription in the spirit of “High voltage. Don `t open". And it hangs there is not simple, because in every TV with a kinescope there is a very entertaining thing called TDKS. The abbreviation stands for "a diode-cascaded line transformer", in the TV it serves, first of all, for the formation of a high voltage for powering the kinescope. At the output of such a transformer, you can get a constant voltage of as much as 15-20 kV. The alternating voltage from the high-voltage coil in such a transformer is increased and rectified by the built-in diode-capacitor multiplier. The TDKS transformers look like this:
High voltage source from TDKS
A thick red wire extending from the top of the transformer, as it is not difficult to guessand is designed to remove high voltage from it. In order to run such a transformer, you need to wind its primary winding on it and assemble a not complicated circuit, which is called the ZVS driver.

Scheme

The diagram is presented below:
High voltage source from TDKS
The same diagram in another graphical representation:
High voltage source from TDKS
A few words about the circuit. Its key element is the field-effect transistors IRF250, IRF260 is also well suited here. Instead, they can be put and other similar field-effect transistors, but it is best to use this circuit in this scheme. Between the gate of each of the transistors and the minus of the circuit, the zener diodes are installed at a voltage of 12-18 volts, I put the Zener diodes BZV85-C15, at 15 volts. Also, ultrafast diodes, for example, UF4007 or HER108, are connected to each of the valves. Between the drains of the transistors, a 0.68 microfarad capacitor is connected for a voltage of at least 250 volts. Its capacity is not so critical, you can safely put capacitors in the range of 0.5-1 μF. Quite significant currents flow through this capacitor, so it can be heated.It is advisable to put several capacitors in parallel, or else take a capacitor for a higher voltage, 400-600 volts. There is a choke on the circuit, the nominal of which is also not very critical and can be in the range of 47 - 200 μH. You can wind 30-40 turns of a wire on a ferrite ring, it will work anyway.

Production

High voltage source from TDKS
High voltage source from TDKS
High voltage source from TDKS
High voltage source from TDKS
If the choke is very hot, then you should decrease the number of turns, or take a thicker wire. The main advantage of the circuit is high efficiency, because the transistors in it almost do not heat up, but, nevertheless, they should be installed on a small radiator, for reliability. When installing both transistors on a common radiator, it is imperative to use a heat-conducting insulating gasket, since the metal back of the transistor is connected to its drain.The supply voltage of the circuit lies within 12 - 36 volts, at a voltage of 12 volts at idle, the circuit consumes about 300 mA, with a burning arc, the current rises to 3-4 amperes. The higher the supply voltage, the greater the voltage will be at the output of the transformer. If you look closely at the transformer, you can see the gap between its body and the ferrite core of about 2-5 mm. On the core itself, you need to wind 10-12 turns of wire, preferably copper. You can wind the wire in any direction. The larger the cross-section of the wire, the better, but a wire with too much cross-section may not pass into the gap. You can also use enameled copper wire, it will fit through even the narrowest gap. Then it is necessary to make a withdrawal from the middle of this winding, exposing the wires in the right place, as shown in the photo:
High voltage source from TDKS
High voltage source from TDKS
High voltage source from TDKS
High voltage source from TDKS
High voltage source from TDKS
It is possible to wind two windings of 5-6 turns each way and connect them, in this case also a tap from the middle is obtained. When the circuit is turned on, an electric arc will occur between the high-voltage terminal of the transformer (a thick red wire at the top) and its minus. The minus is one of the legs. Determine the desired negative leg can be quite simple, if you alternately bring the "+" to each leg. The air penetrates at a distance of 1 - 2.5 cm, so a plasma arc will immediately appear between the desired foot and the plus. You can use such a high-voltage transformer to create another interesting device - Jacob's ladder. It is enough to arrange two direct electrodes with the letter "V", to connect one plus, to another minus. The discharge will appear below, begin to creep up, at the top it will burst and the cycle will repeat. Download fee here:

Tests

In the photos the ladder of Jacob looks very spectacular: High voltage source from TDKS
High voltage source from TDX The voltage at the output of the transformer is deadly, therefore it is mandatory to observe safety precautions. After turning off the power at the output of the transformer, high voltage continues to be present, so it should be discharged, closing the high-voltage leads between them. Successful assembly!

Date: 17.11.2018, 02:19 / Views: 91453

Related News


You will not guess: Kardashian admitted how much she weighs in reality
How to set up a gas burner
Earrings with fluffy fur
Decoration bottle strip
We transform a hairbrush
Steel doors in Volgograd
Buying glass on the car