SU1109897A1 - Magnetic modulation transducer - Google Patents

Abstract

MEASURING MAGNETIC MODE-. A LIQUID CONVERTER containing a series-connected high-frequency oscillator, a frequency divider, an excitation filter, a second harmonic magnetic modulator, to the input winding of which an input signal bus is connected, an ac current amplifier and a phase detector, characterized in that a counter and a reset pulse shaper are entered, the input of the reset pulse shaper is connected to the excitation winding of the magnetic modulator, the output of the reset pulse shaper 1 with unified with the bus resetting account (A snip, the count input of the counter is coupled to the output of the high frequency oscillator, and the counter output is connected to a control input of a phase detector, whose output is connected to an output device bus.

Description

The invention relates to electrical measuring equipment and is intended for use in input devices of electronic measuring devices and systems based on magnetic modulators (mm).

A known direct current transducer with a MDM channel, comprising a second harmonic magnetic modulator, an alternating current amplifier, a phase detector, a generator, a frequency divider, a C.1 excitation filter.

The disadvantage of such a DC converter based on second-harmonic MM is the instability of metrological characteristics such as sensitivity and zero level, due to the dependence of the phase of the signal at the output of the magnetic modulator relative to the reference voltage of the generator and the parameters of the excitation filter excitement of MM in service.

The closest to the invention is a DC / DC converter containing a second harmonic magnetic modulator, an AC amplifier, a phase detector, a high frequency master oscillator, a frequency splitter, and an excitation filter 21

A disadvantage of the known device is low accuracy due to a change in the phase of the amplified signal in the measuring channel relative to the reference voltage on the phase detector, which leads to instability of the sensitivity and zero level of the converter as a whole.

The purpose of the invention is to increase accuracy by increasing the sensitivity stability and the zero level of the magnetic modulating converter.

The goal is achieved by including a generator, divider, frequency, excitation filter, second harmonic magnet modulator of the second harmonic to the input winding of which the input signal is connected, the AC amplifier and the phase detector are inserted into the measuring magnetomodulation transducer containing the second harmonic magnet modulator and the reset pulse shaper, with the input of the shaper pulse reset.

the excitation winding of the magnetic modulator (mm), the output of the reset pulse shaper is connected to the reset bus of the counter, the counter input of the counter is connected to the output of the high-frequency master oscillator, and the output of the counter is connected to the control input of the phase detector whose output is connected to the output bus of the device FIG. Figure 1 shows the structural scheme of the proposed magnetic modulating converter, one in Fig. 2, from possible options for constructing a reset pulse shaper circuit, Figure 3 is a timing diagram of the signals of the main components of the magnetic measuring modulating converter.

The magneto-modulation converter contains an input signal bus 1, a high frequency oscillator 2, a frequency divider 3, excitation filter 4, a second harmonic magnetic modulator 5, an AC power amplifier 6, an output phase detector 7, 8 output signal, a reset pulse driver 9 and a counter 10 .

Bus 1 input signal is connected to the magnetic input winding. modulator of the torus. The output of the high-frequency master oscillator 2 is connected to the counting inputs of the divider 3 and the counter 10. The output of the divider 3 is connected to the input of the excitation filter 4, the output of which is connected to the excitation winding of the magnetic modulator 5 and to the input 11 of the resetting device 9 of the reset pulse which is connected to the reset terminal of the counter 10. The output winding of the magnetic modulator 5 is connected to the input of the AC amplifier 6, the output of which is connected to the input of the phase detector 7. The output of the phase detector is connected to the bus 8 of the output signal magn it is a modulation converter. The control input of the phase detector is connected to the output of counter 10

The device works as follows.

The input signal of the direct current through the bus 1 is fed to the input of the magnetic modulator 5, in which it is converted into an alternating voltage of frequency 2f, where f is the excitation frequency of the magnetic modulator. Further, the alternating voltage is amplified by the AC amplifier 6 and detected by the phase detector 7. A print on the bus 8 of the device produces a constant voltage proportional to the signal on the bus 1. The driving high-frequency generator 2 produces the voltage fj, and f o f. Using a meter, this voltage is converted to a voltage of frequency f, which, passing through filter 4, excites a magnetic modulator 5. From the output of the master oscillator 2, the voltage of frequency f also goes to counter 10, where it is converted to a voltage of frequency 2f, which is supplied as a reference to the phase detector 7. The phase state of the counter 10 relative to the phase of the excitation signal of the magnetic modulator 5 is determined by a short pulse operating at a repetition frequency f at the output of the shaper 9 of the reset pulse, on which This signal is supplied from the magnetic modulator 5 excitation winding. The reset pulse shaper contains a comparator 12 that generates a signal for the operation of the integrated micro circuit, an integrated microcircuit 13, four I-NB elements l4-t7. A signal from the excitation winding of the magnetic modulator 5- is supplied to the input 11 of the driver 9 of the reset pulse, and a short reset pulse acts on the output 18 of the element 17 of the driver 9. , period To, 1 / fei b is the signal with frequency f at the input of the resetting idle pulse (signal from excitation of the magnetic modulator 5 v - output signal of the comparator 12 (FIG. 2) j g output signal of the impuls impulse generator / d - signal with frequency 2f on in During counter 10 (FIG. 1) Introduction counter "reset pulse shaper allows to increase the stability of metrological characteristics DC converter due ustraneiil iestabilnostey effect phase shifts in the channel vozbzokdeni magnetic modulator.

R

II

..- J

Fig.Z

Claims (1)

I MEASURING MAGNET-. A LATERAL CONVERTER containing a series-connected high-frequency master oscillator, a frequency divider, an excitation filter, a second harmonic magnetic modulator, to the input winding of which an input signal bus, an AC amplifier, and a phase detector are connected, characterized in that, in order to increase accuracy, they are introduced into it a counter and a reset pulse shaper, wherein the input of the reset pulse shaper is connected to the excitation winding of the magnetic modulator, the output of the pulse shaper § reset is connected with the counter reset bus, the counter input of the counter is connected to the output of the high-frequency master oscillator, and the counter output is connected to the control input of the phase detector, the output of which is connected to the output bus of the device.