SU879272A1 - Method of transformer converter output signal correction - Google Patents

Description

The invention relates to instrumentation technology and can be used to measure displacements. The closest to the invention is a method for correcting the output signal of a transformer converter, which consists in supplying a sinusoidal current to the converter power supply winding, converting it into a sinusoidal voltage, extracting the reactive component from the sinusoidal voltage on the power supply winding of the converter, and using it to correct the amplitude of the sinusoidal current l. However, this method is characterized by insufficient correction accuracy when the ambient temperature varies widely, and also when the converter is powered by high frequency current due to the effect on the reactive component of the parasitic capacitance of the converter power winding. . The purpose of the invention is to improve the accuracy of the correction. The goal is achieved by assigning a reactive component from a sinusoidal voltage to a paddle on the inductive impedance of the supply winding. The drawing shows a block diagram of a device that implements the described method. The device contains a frequency modulated sinusoidal current generator 1, a sinusoidal current amplitude regulator 2 connected to the generator 1 output, a voltage adder 3, one of the inputs of which is connected to the regulator 2 output, preg generator 4 with a power winding having its own inter-turn capacitance 5, own inductance 6, own resistance 7, one end of which is connected to the output of controller 2, amplifier 8, the input of which is connected to the output of the power winding, and the output to the second input of adder 3 Inverter 9, the input of which is connected to the output of controller 2, the first controlled voltage divider 10, the input of which is connected to the output of inverter 9, an exemplary capacitor 11 connected at one end to the output of the first controlled divider 10, and the other to the amplifier input 8, phase-sensitive indicator 12, connected by one input to the output of amplifier 8, and the other to output of adder 3, differentiating element 13, the input of which is connected to the output of amplifier 8, the second controllable divider 14 for voltage, whose input is connected to the output of amplifier body 8, and a control input to the output of a phase-sensitive indicator 12, an exemplary resistor 15j connected at one end to the input of amplifier 8, and the other from, the input of the second controlled voltage divider 14, amplitude detector 16 connected to the output of the output of differentiating element 13, and the output from the control input of the first controlled voltage divider 10, expander 17, connected by its input to the output of the adder 3, voltage comparator 18, connected by one of its inputs to the output of receiver 17, a; the output is from the control input of the regulator 2, the source 19 of the reference voltage, the output of which is connected to another input of the voltage comparator 18, two identical measuring windings 20 and 21, connected in opposite. The device works as follows. The output current from the oscillator 1 of the frequency-modulated sinusoidal current is fed through an amplitude regulator 2 to the power winding of the inverter 4. With the help of an amplifier 8, a phase-sensitive indicator 12, a controlled voltage divider 14

) D- (5- oCoHlU R.4-Cg; b6) l 0

Ziots- () (j "and) -C) ChSB-1 1oSo) (jwR4 w)

g

Using a differentiating element 13, the voltage Ug obtained at the output of the amplifier 8, differential

is. The amplitude detector 16 extracts the envelope of the voltage produced at the output of the differential 2 and the voltage adder 3 and the active and reactive components of the voltage across the litany winding of the converter 4 are extracted. At the same time, the reactive component at the output of the voltage adder 3 is determined by the expression Oj-.jcou -) (j; 4 fe), l4V% oS)) 134, W de L- is the inductance of the inverter power winding; R is the active resistance of the reference resistor 15; Ajt is the gain ratio of the second controlled voltage divider 14; С - own inter-turn capacitance of transformer power winding; K is the transmission coefficient of the first controlled voltage divider 10; C is the capacitance of the reference capacitor J1; R. is the intrinsic resistance of the converter power winding; (t) is the circular frequency of the current feeding the converter power supply winding; ii - the current flowing through the inductive resistance of the winding. ki power converter. With the help of a miter 17, a comparator 18 voltages and a source of 19 porous voltage by acting on the negative feedback circuit on the regulator 2 amplitudes of -. is available. voltage stabilization at the output of the voltage accumulator 3. In this case, the voltage at the output of the voltage 8 is determined by the expression

element, due to frequency modulation of the current, and controls the transfer coefficient of the first controlled voltage divider 10 until the envelope is eliminated, i.e. until satisfied

M

SB-OO-DETERMINATION This output of the voltage adder 3 is the reactive component of the sinusoidal voltage, falling on the inductive resistance of the power winding, is equal to

 W

Separation from a sinusoidal voltage on the power winding of the converter of the reactive component falling on the inductive resistance of the power winding eliminates the influence of the parasitic power winding capacitance, which is unstable when changing the ambient temperature over wide limits, and the output signal of the converter and thereby

8792726

improve the accuracy of the correction of the output signal of the converter.

Claims (1)

Invention Formula The method of correction of the output signal of the transformer converter is concluded in that a sinusoidal current is supplied to the power winding transducer, transform it into a sinusoidal voltage, from the sinusoidal voltage on the winding of the power supply to the transducer, the reactive component is extracted and used to correct the amplitude of the sinusoidal voltage current, characterized in that, in order to improve the accuracy of the correction, a reactive component, which is incident on the inductive impedance of the supply winding, is separated from the sinusoidal voltage. Sources of information taken into account in expert examination 1. Application No. 2651946 / 18-28, cl. G 01 B 7/00, 1979 (prototype)