SU1073422A1 - Supply system of magnetostriction converter - Google Patents

Abstract

SYSTEM POWER magnetostrictive, converter comprising a switching power supply connected to the coil of the vibrator and the control unit comprising shaper resonance frequency power pulses and the oscillator sine wave low frequency connected to schirotnoimpulsnomu modulator, characterized in that, in order to increase the depth of modulation wide frequency range, it is equipped with a phase-shifting device, one input of which is connected to the output of the power supply driver resonantly frequency, the other input is with the output of sinusoidal low-frequency oscillations, and the output is connected to the pulse-width modulator.

Description

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The invention relates to power supply systems for complexes containing magnetostrictive transducers (ICPs) and can be used for drilling, earth vibration and seismic exploration.

A known power supply system of an SME is in which amplitude modulation of high-frequency oscillations takes place using two generators operating at full power of the vibrator 1.

However, the system is complex, unreliable and has a large inertia in the chain of change of the modulation frequency. The system is inoperable at high frequencies.

The closest to the technical essence and the achieved result to the proposed is the power supply system of the magnetostrictive transducer, containing a pulsed power source connected to the winding of the vibrator and a control unit, which includes -, a resonator frequency pulse shaper connected to the pulse modulator 2.

Its disadvantage is the small modulation depth in a wide frequency range.

The purpose of the invention is to increase the modulation depth in a wide frequency range.

The goal is achieved by the fact that the power supply system of the magnetostriction converter contains a pulsed power source connected to the winding of the vibrator and a control unit including a driver for supplying pulses of a resonant frequency and a low-frequency sinusoidal oscillator connected to a pulse-width modulator equipped with a phase-shifting device, one input connected to the output of the pulse voltage driver of the resonant frequency, the second input with the sinusoidal generator output oscillations of low frequency, and the output is connected to a pulse-width modulator.

FIG. 1 is a block diagram of an ICP power supply system; in fig. 2 - time diagram of work; in fig. 3 - time diagrams of pulses for characteristic points of the envelope (a, b, c, d).

The system contains a pulsed power source 1, powering the ICP 2, the control system 3. The control system 3 contains a driver of 4 pulses of power supply of a resonant frequency, a sinusoidal generator 5, a micropulse modulator 6 and a phase shifter 7.

The system works as follows. Pulses of a constant duration of the resonant frequency from block 4 through a phase-shifter 7, synchronized from a sinusoidal generator 5, are fed to a pulse-width modulator 6. The other input of block 6 receives a sinusoidal modulation frequency signal from block 5. From the output of block 6, pulses of a resonant frequency have a duration modulated by a sinusoidal law. In accordance with them, the pulsed source 1 forms pulses of varying duration on the winding of the ICP (Fig. 3). The oscillations of the end face of an SME are modulated by a low frequency (Fig. 2).

5 With an increase in the modulation frequency (without a phase shifting device), the modulation depth decreases due to the mechanical inertia of the MRF (dotted envelope in Fig. 2). To eliminate this effect, the SME is transferred to the braking mode (as well as any electromechanical transducer). To do this, in the portion of the modulating oscillation range, where the amplitude of the oscillations decreases, the power supply pulses are supplied with a phase shift (aO, where OL is the angle between the power pulses and the generator emf). the transfer of SMEs in the brake mode. Obviously, the deceleration is maximum pr (180 °. In Fig. 3 for the characteristic points of the envelope (a, b, c, d) the temporal diagrams of the pulses are given.

The oscillator EMF of the ICP (Ij) repeats the oscillations of its end face, i.e. the amplitude 1 is proportional to the amplitude of the oscillations of the ICP and the angle is equal to the phase shift between the power pulses and the oscillations of the end face of the ICP

5 i.e., from point to point 2, the MRF operates in the braking mode. When the modulation frequency is changed from the maximum possible downward angle, the angle L changes from 180 to 0 °, reducing the influence of the braking mode. Thus, as the modulation depth decreases, the offset angle θ is introduced, which increases as the modulation frequency increases to 180 °.

The introduction of the braking mode allows the upper limit of the 5 hour range to be expanded, in which the modulation depth is maximum. The accuracy of the measuring devices on the part of the increased frequency range increases. Thus, the effect of the invention can be characterized as an increase in accuracy at a specific, fixed impact force, or, conversely, an increase in the power of the shock wave in the high frequency range (20-80 Hz) from 20 to 100-150 tons, which increases the seismic survey radius.

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Claims (1)

MAGNETOSTRICTION TRANSMISSION POWER SYSTEM A DEVELOPER comprising a switching power supply connected to a vibrator winding and a control unit including a resonant frequency power driver and a low frequency sinusoidal oscillator connected to a pulse width modulator, characterized in that, in order to increase the modulation depth in a wide frequency range, it is equipped with phase shifting device, one input of which is connected to the output of the pulse shaper of the power supply of the resonant frequency, the other input is the output of the sinusoidal oscillations low frequency, and an output connected to the pulse-width modulator.