SU970084A1 - Transformer converter output signal correction method - Google Patents

Description

measuring winding, Defined by a known expression. Tsaiy () i) 1 „(nlLovLU i (Lo / L ;;) u; i dB output voltage of the converter carrying information about the displacement; M - weed and inductance of the power windings with the first and second sections of the differential and measuring windings, respectively, hung w - circular frequency of the sinusoidal current of the transmitter supply; 1 - current flowing through the power winding of the transformer; main inductance of the power winding of the converter that connects the main ground current with the current in the converter's power supply L LQ - Major Induction According to the first and second sections of the differential of the measuring winding. When using the full reactive component of the voltage drop on the winding of the converter power supply, and as it is provided in the known method of correction, U, (LO, - Lg. 1 "B As a result, the output voltage of the converter will depend on both the main inductance LQ of the power winding and its inductance LS-I dissipation. Indeed, converting (2) to 1 and putting it in (1), we get mT-N LO LOT. LO f, Lg When using the same (according to the invention) particles O Q, the reactive component of the voltage drop on the converter power supply winding, corresponding to the voltage drop on its main inductive resistance Jno IP, the output voltage of the converter when substituting (4) into C1) is determined by the expression L Lot Lo7 ll LO Considering that the main inductive windings of the converter can be determined by the formulas

"one

W w2

wi

g

(6)

С V R ;;;

02

Claims (2)

RM where Rjj, is the magnetic resistance of the main magnetic flux of the converter; Wn is the number of turns of the winding Wj-, respectively, the number of turns of the first and second sections of the differential measuring winding, we obtain that -% G and URM. -1/7 and Etkuda follow that when the current of the transformer converter is adjusted by a signal corresponding to a part of the reactive component of the voltage drop across its supply winding, falling on the main inductive resistance of this winding, the output voltage of the converter depends only on the ratio of the number of turns of sections the differential measuring winding and the number of turns of the power winding, penetrated by the main magnetic flux of the converter, and does not depend on the inductive resistance of the scattering of this winding .. On The drawing shows the block diagram of a device resharing the FJ method. A sinusoidal current generator 1 through a sinusoidal current amplitude regulator 2 and an exemplary resistor 3 is connected to the input of the first amplifier 4. The output of the first amplifier 4 is connected to the first input of the voltage adder 5 and the control input of the phase-sensitive rectifier 6, through the first exemplary inductance 7 it is connected with its input, and through the second exemplary inductance 8 - with the input of the second amplifier 9. The output of the second amplifier 9 is connected to the second input of the voltage adder 5, and through the power winding, presented in the form after ovatelno connected own active resistor 10, inductor 11 and the stray inductance of the primary 12 of the transducer 13 moves, it is connected to its input. The output of the voltage adder 5 is connected via a phase-sensitive rectifier b to the first input of the comparison circuit 14, to the second input of which the output of the reference voltage source 15 is connected. The output of the comparison circuit 14 is connected to the control input of the regulator 2 of the amplitude of the sinusoidal current. The output voltage Ug, of the transducer 13, which is proportional to the measured displacement x, is obtained, for example, from a differential measuring winding consisting of two identical, counter-connected sections 16 and 17. The device works in the following way. . The current i from the output of the generator 1 is fed through a controlled regulating 2 amplitudes of the sinusoidal current, the coefficient K, the transmission, to the input of the first amplifier 4, creating a voltage drop, equal to К „- R, 7 Ii, on the reference resistor Kz. U, at the output of the first amplifier 4, which has a model inductance 1 in the negative feedback circuit, is equal to JriLkL.u ,, U4 -3 RS. If the transfer factor K of amplifier 4 is high, the current flowing through the reference resistor 3 the current flowing through the model inductance 7, and when equal, where Lg, is the sample inductance 8, it is also equal to the current flowing through the specified inductance 8. With a high value of the coefficient Kg, the transmission of the second amplifier 9, the current flowing through the converter power supply winding, 13, is equal to the current flowing through the model inductance 8. As a result, Ug at the output of amplifier 9, and, consequently, the voltage across the power winding of the converter 13, is determined by the expression Cs J-If) and. where the inductance of dissipation of the power winding of the transformer l 13} is the main inductance of the winding of the power supply of the converter R., 0 is the intrinsic resistance of the winding of the power supply of the converter 13. As a result, at the output of the voltage adder 5 we get JJl, -mLi J. Us .J - J When the condition L is fulfilled, | / 1 l, the voltage Ug will be equal to AND. Oc Cz The voltage U, as well as the voltage, will be fed to the inputs of the phase-sensitive rectifier 6 with the coefficient Kf, the transmission, at the output of which compiled to pay ng. con stant U, COOT An actual voltage drop across the main inductive resistance 12 of the power winding: ctcKb TZ The received voltage U at the output of the phase-sensitive rectifier b is compared according to the comparison circuit 14 with the reference voltage generated at the output of the voltage source 15 of the reference voltage. the amplitude of the sinusoidal current until the condition 1 W is satisfied. Since Kj, the value is constant, the fulfillment of this condition means the stabilization of the portion of the reactive component of the voltage on the main inductive resistance of the C winding, the power supply is transformed; The proposed method makes it possible to increase the measurement accuracy under conditions of significant temperature differences by 2-2.5 times as compared with the known similar methods. Claims The method of correcting the output signal of a transformer converter is that it supplies a sinusoidal current to the converter power supply winding, converts it into a sinusoidal voltage, and extracts from it the reactive component of the voltage drop on the converter power supply, tl and black currents. that, in order to improve the accuracy of the correction, a part corresponding to the voltage drop on the inductive voltage is eliminated from the reactive component of the voltage drop on the converter winding The dissipation resistance of this winding is used to correct the amplitude of the sinusoidal current, the remaining part of the reactive component, corresponding to the voltage drop on the main inductive resistance of the power winding. Sources of information taken into account during the examination 1. E. Bromberg. et al. Measuring and information systems of high precision movements. - Devices and control systems, 1973, No. 6, p.23 2. Authors certificate of the USSR 756185, cl. G 01 to 7/00, 1978 (prototype). O w o