SU1288864A1 - Control device for rectifier converter - Google Patents

Abstract

The invention relates to converter technology and is intended for use in converter control systems. The purpose of the invention is to improve accuracy. At the zero level of the control signal, at the output of the relay element 4, a square wave type signal is generated with an average zero value and equal intervals of the conversion transform. At the time points of the sign change at the output of differentiating link 9, differentiating pulses are formed, which, after rectification, trigger the single-oscillator 11. If a control signal is present in one half-period, the signal of integrator 3 changes under the action of the sum of the signals at the input of the adder 1 another half-period - under the influence of the difference of these effects. As a result, during the period of self-oscillations, the constant component of the pulses at the output of the relay element 4 reaches a value proportional to the level of the input signal of the converter. When an input signal is present, the output voltage of the integrator 5 changes under the action of the output voltage of the inverter 2 and the signal at the output of the relay element 4. Therefore, as the input effect increases, the voltage rise rate at the output of the second integrator 5 increases, the duration of the output pulses increases and The output signal is proportional to the control signal. 3 il. fo wyum w

Description

11288864

The invention relates to electrical engineering and is intended for use in electric drive control systems with pulse-width representation of information.

The purpose of the invention is to improve the accuracy of the linearity of the valve converter (VP).

FIG. 1 shows functional

3; one

Y (t) is the voltage at the output kca 2 Y (t) is the output signal of the real element 4, - Yg. (T) is the output signal of the integrator Sj YqCt) si 5 at the output of link 9; ) - with the output of the demodulator 10; Y ,, (t) one-shot output pulses

(t) - output signal device 1, t, TO, t, t - intervals p

., -.- and-h-c

The device diagram in FIG. / and - transient and rolling transformation}.

alternate charts of its signals.

The device contains a first adder 1, an analog inverter 2, a series-connected first integrator 3 and a relay element 4, a second integrator 5 with information 6 and installation 7 inputs, connected to the output of the second adder 8, successively connected in proportion to the differentiating link 9, demodulator 10 and a one-shot 11, a key element 12 with a dead zone, input 13 and output 14 terminals.

Integrators 3 and 5 have a transfer function of the form W (p) 1 / Tp and time constants T, and T, respectively.

Analog Inverter 2 implements the transfer function

YjCt) (-l) X (t) where X (t) is the VP input signal.

Relay element 4 is made with thresholds sogatogani ± b and non-inverting hysteresis loop. The output of block 4 varies discretely within ± A.

The integrator 5 is configured with a setup input 7. If there is a signal on Log.1 on it, the output signal of the integrator 5 is O, regardless of the size and sign of the signal at input 6.

Link 9 implements a function of the form W (p) Tr / (1 + T).

The demodulator 10 serves to rectify the output of block 9.

The single-oscillator 11 generates at the output a pulse of a given duration synchronously with the leading edge of the signal at the output of the block 10.

The key element 12 has an insensitivity zone, t С and the input-output characteristic inverting characteristic.

FIG. 1 and 2 the following notation is entered: X (t) is the input signal, Y (t) is the integrator output signal

3; one

Y (t) is the voltage at the output of the unit 2 Y (t) is the output signal of the relay element 4, - Yg. (T) is the output signal of the integrator Sj YqCt) is the signal at the output of link 9; ) is the signal at the output of the demodulator 10; Y ,, (t) - output pulses of the one-shot 11;

(t) is the output signal of the device; 1, t, TO, t, t - intervals times., -.- and-ch-c

swiveling transformation}.

0

tj, t - pause intervals.

The device works as follows.

Link 1, 3, and 4 together form a self-oscillating frequency – pulse-pulse system. At the zero level of the control signal, at the output of the relay element 4, a square wave signal is generated with an average zero value (Fig. 2a) and equal intervals of the development transform (t t in Fig. 2a).

At the instants of change of the sign 5 of the output signal of the relay element 4, pulses (Fig. 2c) are generated at the output of the link 9, which, after rectification (Fig. 2d) using the demodulator 10, triggers the one-shot 11 (Fig. 2e).

0

five

0

0

five

Subject to the conditions T 2T

a / b / / c / for the half-switching period of the relay element 4, the output signal of the integrator 5 does not reach the switch-on zone of the key element 12, therefore the output signal of the integrator 3 changes under the action of the sum of the signals at the input of the adder 1 (Fig. 3a) - under the influence of the difference of these effects. As a result, during the period of self-oscillations, the constant component of the pulses at the output of the relay element 4 reaches a value proportional to the level of the input signal of the device.

If there is an input signal, the output voltage of the integrator 5 is changed by the action of the output voltage of the analog inverter 2 and the signal at the output of the relay element 4 (Fig. Rear, dotted line). Therefore, with an increase in the input effect, the voltage rise rate at the output of block 5 increases and the duration of the output pulses of the device increases (Fig. Ze). As a result, the useful component of the output signal of the device is proportional to the control signal.

312

The application of the proposed device allows to ensure the linearity of the adjustment characteristic and thereby increase the accuracy of its operation in open and closed control systems.

Claims (1)

Invention Formula A device for controlling a valve-f0 converter, a single converter containing a control signal source, a first input of the first adder, a first integrator, a relay element and the first input of the second adder, the output of the relay element also connected to the second input of the first adder, - a series-connected proportional differentiating link, is connected to the output of the ta, the demodulator and the output of which is connected by the input of the second integra which is connected to the insensitive zone of which dnaznache audio to the control in e with the fact that, with the c performance accuracy of the fan, it is equipped with an inverter, the input to the signal source is connected to the second adder, and output to the information integrator. converter, about t The de-linking unit, whose input is connected to the output of the relay element, is a demodulator and one-shot, the output of which is connected to the installation input of the second integrator, the output of which is connected to a key element with a dead zone, the output of which is intended to be connected to the control input of the valve so that, in order to improve the accuracy of the valve converter, it is equipped with an analog inverter, the input of which is connected to the control signal source, and the output is connected to the second input of the second adder, the output of which is connected to the information input of the second integrator . Uvm xl hG yult) X t L Mt} I JH ILJIILJI T L s b r. zi r. X (f) / To at m II k: c (t) () T I T 11 UE () d with about with Editor A. Kozoriz Compiled by .S.Luzanov Tehred A. Kravchuk Proofreader G. Reshetnik Order 7822/56 Circulation 683 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production-polygraphic enterprise, Uzhgorod, Projecto st., 4 Fig.Z