SU996946A2 - Electric signal magnetoelectronic converter - Google Patents

Description

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The invention relates to information measurement technology and can be used to accurately transmit electrical signals of complex shape through a transformer; chain.

According to the main author. St. N 900199 known magneto-electronic converters of electrically signals, containing a transformer, in which the power supply and feedback windings are connected to a signal source, a compensating amplifier whose output is connected to the power supply winding of the transformer, and two operational amplifiers, the first of which is in the form of an inverter and is turned at the output of the compensating amplifier, implemented non-inverting, and the second is made in the form of an inverting adder and connected at the input to the output of the first operational amplifier and with the winding The feedback of the transformer and, on the output, to the input of the compensating amplifier 1.

A disadvantage of the known converter is the unsatisfactory transmission accuracy through the flat circuit transformer.

sections of electrical signals, such as square voltage peaks, the duration of which is much longer than the transient processes in a transformer, due to the fact that the source of the converted electrical signal, having a finite amount of internal resistance, flows the entire current of the supply winding of the transformer.

The purpose of the invention is to improve the accuracy of the conversion of a magneto-electronic converter of electrical signals.

The goal is achieved by the fact that an additional resistor and an inverting amplifier are introduced into the magnetoelectronic converter of electrical signals, and

15, the latter is connected between the power supply and the input of the inverting accumulator, and the resistor is connected between the common wire and the power supply.

The drawing shows the structural scheme

20 magnetoelectronic converter of electric signals.

Claims (1)

The converter contains a signal source 1, a transformer 2 with a supply winding 3. 3996 by winding4 the feedback and the second windings 5 and 6, a compensating amplifier 7, an inverting operational amplifier 8, an additional inverting amplifier 9, an inverting adder 10 and an additional resistor 11, the resistance of which is FR, the converter operates as follows. The voltage from the signal source 1, applied to the winding 3 of the transformer 2 power, excites the EMF in the secondary amps 5 and 6 and in the feedback winding 4. In the transformer 2, the winding 3 of the power supply and the winding 4 of the feedback are made of twisted wire (bifillary), and the windings 3 and 4 are equal to each other and, therefore, the coupling coefficient between them is almost equal to one. Under these circumstances, the voltage of self-induction and mutual induction in windings 3 and 4 are the same and, with the accepted scheme of their inclusion (counter) voltage at the input 12 of the inverting adder 10 relative to the common wire, is equal to the sum of the voltages on the active resistances of the windings 3 (Rj /) and 4 () voltage at the output of the compensating amplifier 7. The input 13 of the inverting adder 10 receives the voltage from the output of the compensating amplifier 7 through the inverting operational amplifier 9, and the input 14 - voltage from the additional resistor 11 h cutting an additional inverting amplifier 9. In this case, the gain of the voltage of the additional amplifier 9 is selected from the condition B- R where R (is the internal resistance of the source 1 signal, and the gain factors for the voltage of the other amplifiers are equal to one. All three of the indicated voltages are summed at the input of the inverting adder 10 and is fed to the input of the compensating amplifier 7, the output voltage of which provides compensation. voltage drops and resistors R, j; j, d. As a result of this compensation in the circuit, including the power winding 13 and the signal source 1, the EMF (t) of the signal source 1 is connected directly to the power winding terminals 3, mine resistance of rc and r. Under such circumstances, the magnetic flux f (t) in the magnetic core of transformer 2 is determined from the expression; fa) -4 | eC-e) a% + Fo, and the emf e (t) induced in the secondary windings 5. .6 of transformer 2 eCt1 - w, Ae (t). Thus, the law of variation of the emf in the secondary windings of transformer 2 exactly corresponds to the law of variation of the emf of the signal source 1, i.e., the goal is achieved. This magneto-electronic converter of electrical signals can be used. a van in various automation and measuring devices for the accurate transmission of electrical signals through transformer circuits and, in particular, for the transmission of rectangular voltage without dropping tops. Claims invention Magnetoelectronic converter of electrical signals according to ed. St.-No. 900199, characterized in that, in order to increase the conversion accuracy, an additional resistor and an inverting amplifier were inserted in it, the latter being connected between the power source and the input of the inverting adder, and the resistor between the common wire and the power source. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 900199, cl. G 01 B 19/20, 07.27.79.