2020-02-24

Short pulses, the bias currents and the unusual behavior of ferromagnetic materials. We continue a series with short pulses and an inductor, however, here we focus on the bias currents and the response of ferromagnetic cores for sufficiently short pulses, which will allow us to obtain new nonclassical effects. In this case we will use the ready , standard power supply, oscilloscope, three inductors and a few extra parts. . Further experiments will involve three different coils, with the specifications which can be found below. The first two — do not have secondary winding, and their connection to experiments, are reflected in the figures ; the third coil has the secondary winding and the connections will be made to it . . - Inductance, mH — 2.3
- Permeability, NM — 2000
- Dimensions, mm— 0*15*8
- The number of turns is 26

- Inductance, mH — 5.7
- Dimensions, mm— 0*50*16
- The number of turns — 25

- The inductance of the primary winding, mH — 6.2
- The inductance of the secondary winding, mH — 24.5
- Permeability, NM — 7000
- Dimensions, mm— 0*21*16
- The number of turns of the primary winding — 30
- The number of turns of the secondary winding is 60

__is not more than 0 NS__, the load does not affect the current consumption, and this pattern was observed in the widest range of supply voltages; from the author max U0 was 0 V. the Pattern sohranitsya up to the full short circuit HL1, in the case — even without the diode VD1, i.e., when the circuit of the secondary winding L1. . Thus, when we work only with the bias currents, we can achieve almost complete independence of the power consumption of the circuit from the load resistance. But if the bias currents, we still know little [3], the next experiment could be a revelation for many radio engineers :). Half the frequency response of the coil. Obviously, to obtain multiple harmonics in the response of the coil does not represent any difficulty, they work automatically even under normal excitation. And as to the response of the sub-harmonic, i.e. the frequency is a multiple of the smaller from the master? After all, sub-harmonics, which open up new energy possibilities in the field of electric transformation and it would be very good to learn how to get them. . Connect the inductor 0 with no load , will take her pulses with a frequency of 0 kHz, we choose the supply voltage and look at the waveform . As we can see, the coil gives oscillations with a frequency

__twice smaller__than the sets! But here, in contrast to classical resonance, we need to find the minimum of two parameters: which specifies the frequency and voltage. For example in this case, when the voltage U0 begins to appear to oscillate, is located between two adjacent, and if U0 = 0 V, the response becomes classical, i.e., the frequency response becomes equal to the nominal frequency. There is one caveat to this effect: when the optimal values of frequency and voltage, consumption current scheme is reduced . They also found that the optimum value of this frequency quite precisely corresponds to . .

__the energy of all the harmonics summed into a single pulse__. . . Below are some waveforms from these experiments. Blue beam reflects excitatory pulses, yellow beam — compressed pulse. .