The blocking oscillator on a longitudinal wave
The blocking-generators applied in circuits of pulse technology, which rehabilitates its position, previously unjustly abandoned. And for seekers of free energy, such schemes represent endless possibilities, because you can concentrate more energy in a short pulse, have steep characteristics of the front and the decline of the pulse, and it's fairly simple to implement and configure. In this note we consider an unusual blocking, which runs on the longitudinal wave raspostranyatsya the core.
If you look at his diagram, it is possible to pay attention to the connection of the windings of the coil: in contrast to the classical scheme of the blocking generator, the base and the collector of the transistor here is got their start (they are depicted by the circles). Therefore, in the usual way the blocking can not be excited — there is no positive feedback! To distinguish these different patterns will call our — P-blocking and consider the conditions for its initiation.
Not always, but this scheme can be excited at a relatively high ferrite frequency, at low amplitude values and when a small output power. For large amplitudes, which is capable of N-blocking, we need to create the channel, closing the terminals of winding L1.3 (XS1 and XS2 on the scheme). In this case, the design of the ferrite works as a wave channel: wave runs from the coil L1.2 to L1.2, and Vice versa, creating the necessary for the excitation of the phase shift (in the figure the direction of movement of the half-cycle depicted by the arrows). This is the operating mode. This is another fundamental difference between P-blocking — the frequency of operation is much higher than the resonance frequency of the ferrite. For example, cups from the deflection system of the TV can operate at frequencies in 5-7MHz! Also, in contrast to conventional blocking, here's the important construct of performance coils: the distance between the collector and the base winding will depend on the operating frequency.
In the figure, to the right of the schematic diagram, shows a section of ferrite core, showing the location of the windings, all wound in the same direction. The thickness of the wire does not matter, but for powerful devices have all the same to select a relatively large value. Also experimentally observed that the base and collector windings it is better to wind a thicker wire.
To exit the P-blocking of the operating mode, it is sufficient to short the terminals of winding L1.3, which is also shown in the figure on the left (a) and the waveform at the collector of transistor lies here. With this enabled, the device will have a low efficiency, because most of the energy is lost in this winding. One embodiment of the energy extraction of the longitudinal wave represented by the second figure (b) where is the instantaneous charging of the two capacitors. What is interesting is that after fully charging scheme goes into standby and consumes very little power. Oscilogram in this case — such.
Capacitors C1 and C2 are different, the first one should be designed for a small voltage, but have a greater capacity, the second — on the contrary, example: C1 — 2200мкФ*16V, C2 — 47мкФ*50V. Diodes VD1-VD2 is better to take with a low potential barrier, for example — Schottky. The transistor VT1 is better to take from КТ805, but suitable imported 2SC5200. If you calculate the energy cost of the power scheme, and the amount of potential energy in charged capacitors, in some cases it is possible to seredinny values. In addition, the selection of optimal core at the output of the blocking it is possible to obtain quasi-unipolar pulses with nanosecond values of the front and bust.
© Vyacheslav Gorchilin, 2017
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