SU789779A1 - D.c. transducer - Google Patents

Description

one

The invention relates to electrical measuring equipment, but can be used in various kinds of automation devices when performing zero-organs.

A known DC converter is constructed on the basis of a magnetic amplifier with two toroidal ferromagnetic magnetic cores and a ferroresonant generator of 10 damped oscillations fl}.

A disadvantage of the known device is the low sensitivity to the input signal and zero instability due to hysteresis. five

The closest technical solution to the present invention is a DC / DC converter containing a magnetic amplifier on two toroidal ferromagnetic magnetic wires, the input and output windings of which are connected in series, and the excitation windings are opposite in series, a generator of damped oscillations, whose output 25 is connected to the field windings, and the integrator, whose input is connected to the output windings G.

However, the known device is practically unsuitable for transforming

.INN of direct current against the background of an alternating current considerably exceeding the constant and varying over a wide range. The ratio of the signal and interference at the input and output of the known device in this case is unchanged.

The purpose of the invention is to expand the functionality by converting the direct current against the background of the variable.

This goal is achieved by the fact that in a DC converter containing a magnetic amplifier on two toroidal ferromagnetic magnetic cores, the input and output windings of which are connected in series, and the field windings are counter-series, a generator of damped oscillations, the output of which is connected to the windings of the driver No, the integrator, whose input is connected to the output windings, introduces a block for measuring the average value of induction and a low-pass filter, and for each magnetic circuit of the magnetic device An additional body is applied, with the unit for measuring the average value of induction between the output

the integrator and the input of the low-pass filter, and the additional windings of the magnetic amplifier are included in a closed loop with a consistent-series connection.

The drawing shows the functional diagram of the proposed DC-DC converter.

The device contains a generator of damped oscillations, a magnetic amplifier 2 consisting of two magnetic cores 3 and 4, each of which contains an excitation winding 5, an output winding 6, an input winding 7 and an additional winding 8, integ (Rat.or 9, an average induction measurement unit 10 and a low-pass filter 11. The input, output, and additional windings of the magnetic amplifier 2 are interconnected according to one another, and the field windings are counter-consistent.

The Converter operates as follows.

With simultaneous exposure to the mangit piping 3 and 4 of the magnetic amplifier 2 direct current L

subtitled;

supplied to the input windings 7, and a packet of damped alternating current supplied to the excitation windings 5, the magnetic cores are transformed into a magnetic state characterized by dots on the hysteresis-free magnetization curve corresponding to JgrX,

The presence of additional windings 8, connected by short ends, does not prevent the implementation of hysteresis-free magnetization in the absence of an input signal, but significantly slows down the process of establishing induction under the transition to the limit.

Bx

hysteresis loop under the action of the first pulse of the packet. This circumstance makes the pulse readout method used in the known converters unacceptable and requires decreasing the decrement and attenuation of the variable-frequency packet.

Thus, when exposed to an alternating current magnetic circuit, which decays with a low decrement, and a direct current Jg, x, their hysteresis-free magnetization is realized. The readout of the recorded values of magnetic induction and b, corresponding to the input direct current, is as follows.

Under the influence of each packet of damped oscillations, the points characterizing the magnetic state of the magnetic cores 3 and 4 gradually (due to the presence of additional windings 8 that are short-circuited) go to the limiting hysteresis loop and move along it until the amplitude of this damped the current is sufficient to saturate the magnetic cores; in the process of changing the induction in the magnetic cores along the limiting hysteresis loop, its average value is zero. As the amplitude of the alternating damping current decreases, the points characterizing the magnetic state of the magnetic cores gradually return to the initial state from the limiting hysteresis loop. Thus, for: the duration of each packet is zero; the average value of the oscillations; the induction in the magnetic cores varies: from a value of 26 + BGd corresponding to the measured DC current Lt, to zero and then again to a value of 285. By measuring these changes in the average induction value, a value of 3 is determined. For this purpose, an integrator 9 is used in the converter that integrates the output pulses, an average induction measurement unit 10 and a low-pass filter 11.

It should be noted that the damped alternating current plays a dual role in the device. Initially, while its amplitude is sufficient to saturate the magnets of the gadfly, it is used to read the induction by the method of returning and then, dropping to zero, through hysteresis-free magnetization of the magnetic cores.

When exposed to the magnetic cores 3 and 4 of constant and alternating damped currents in the output windings b, a different-polarized pulse sequence occurs, affecting integrator 9. The time constant of integrator 9 is 5-10 times longer than the half-period of damped current oscillations. The change in voltage at the output of the integrator corresponds to the change in induction in the magnetic circuit when they are subjected to damped alternating current.

The average value of the output voltage of the integrator 9, as well as the average value of induction in the magnetic core, changes from a certain value to zero and then, at the end of the damped oscillations, returns to its original value. For this average induction, an average induction measurement unit is used, which can be an integrator with a time constant that is 5-10 times longer than the integrator time constant 9. In order to smooth the high-frequency components in the output signal, t. e. To reduce the conversion error, the voltage from the output of the measuring unit of the average induction value 10 is fed to a low-pass filter 11.

 Thus, the voltage amplitude at the output of the device

Claims (2)

Claim A direct current converter containing a magnetic amplifier on two toroidal ferromagnetic magnetic circuits, the input and output windings of which are connected in series, and the excitation windings are opposed-sequentially, a damped oscillation generator whose output is connected to the excitation windings, an integrator whose input is connected to the output windings, different the fact that, in order to expand functionality by converting DC to AC against the background of alternating current, a measurement unit has been introduced into it an average induction value and a low-pass filter, and an additional winding is applied to each magnetic circuit of the magnetic amplifier <·, and the unit for measuring the average induction value is installed between the integrator output and the low-pass filter input, and the additional windings of the magnetic amplifier are included in a closed loop . solid connection. Evh. • Sources of information taken into account during the examination 1. Copyright 143429, cl. N 2. Copyright 387495, cl. N USSR certificate: 03 F 9/00, 1960. certificate - USSR 03 F 9/00, 1971.