SU1529190A1 - Voltage automatic control device - Google Patents

Abstract

The invention relates to secondary power sources of radio equipment. The aim of the invention is to increase the reliability of work on the active-inductive load. The regulation is performed according to the phase principle as a function of the integral of the difference of the reference signals and feedback. The feedback signal is generated using a multiplier-dividing block. The multiplier-dividing unit is made on the basis of pulse-controlled voltage dividers and a comparator. The voltage from the comparator output is used to form a series of control pulses for a symmetrical thyristor. 1 il.

Description

The invention relates to electrical engineering and can be used to control and stabilize an alternating voltage or current at an active-inductive load.

The purpose of the invention is to increase the reliability of operation on the active-inductive load.

The drawing shows a diagram of the proposed device.

The device contains a master element i, an integral regulator 2, a phase control unit 3, a key element 4, a voltage or current sensor 5 and a multiplier-dividing unit 6. The phase control unit 3 contains a phase-shifting element 7 made, for example, according to the vertical principle a logical element 8, an amplifier 9 (for example, a transistor) and a pulse transformer 10. A multiplier-division unit 6 contains a first controlled pulse voltage divider on elements 11-14, a resistor 15, a second controlled pulse divider voltage PI on the elements 16-20 and comparator 21 The input and output of the first pulsed voltage amplifier are respectively a resistor 13 and a capacitor P. The input and outputs of the second pulse voltage divider are respectively resistor 16 and 20. Control inputs The pulse voltage dividers are the control key switches 14 and 18.

The device works as follows.

Depending on the magnitudes of the setpoint signals Uj and the feedback Uoc, at the inputs of the integrator 2 and at its output, a voltage is generated, which in the phase-shifting device 7 is converted into a pulse with a duration from L to (where 6 is the phase shift angle proportional to the voltage integrator output). This impulse is fed to the first input of an AND 8 gate. At the same time, a signal is received at the second input of the AND 8 gate. logical unit from the output of the comparator 21. The coincidence of logical units at the input element And 8 gives a signal at its output.

cl

with

with

which is amplified by the amplifier 9 and transmitted by the pulse transformer 10 to the control circuit of the key element 4. The latter is otgifaetsya, and a voltage (current) appears in the load 22. The output regulated value (voltage or current) is measured by sensor 5 and is transmitted to the multiplying inputs (resistors 13 and 15) of multiplying-dividing unit 6. To the dividing input (resistor 16) of unit 6 a reference signal is given. The signal from the output of multiplying-separating unit 6 is fed to the input of integrator 2.

Multiply.: 1-dividing block 6 is made in the form of a closed-pulse pulse modulator and it is closed. The currents flowing in the resistors 15 and 20 are compared at the input of the comparator 21. Due to the value feedback: key 18 - resistor 17 - capacitor 19 an oscillatory process is formed.

The multiplier-dividing unit 6 forms the required law of variation of the instantaneous values of the feedback signal, thus stabilizing the effective current pei of the voltage (current) and ensuring the linearity of the output voltage control characteristic and. 1i current.

The parameters of the circuit elements of the multi / 4 italy-dividing block 6 are chosen such that ko, 1bany in it and immeli frequency two or more times higher than the frequency of the network from which the device receives power. Thus, when a device from a 50 Hz network is installed, the oscillations in block 6 have a frequency on the order of 50 kHz. Oscillations of such a frequency pass through the elements 8, 9 and I) into the control circuit of the key power,: 1 element (symmetrically) of the thyristor) 4 and are perceived by it as a not || jerky peak pulse. This ensures a stable insertion of the key element, 1 point 4 fi small value (P) x load current, i.e. The reliability of the ycTpoiicTBa is maintained. Thanks to the transfer

high frequency pulses, the size and mass of the pulse transformer are reduced, and due to the absence of a shaper, the duration of the control pulses and a separate high frequency generator, power consumption is achieved.

Claims (1)

Invention Formula An automatic voltage control unit (current) containing a series-connected driver, an integral regulator, a phase control unit, a key element, a voltage or current sensor, a multiplex-division 6, i: i) k, the first and second multiplying inputs which is connected to the output of a nanometer sensor (current), and the divider input is connected to the output of the master element, the output of the multiplier-dividing unit is connected to the second input of the integral controller, which, in order to ensure the reliability of operation You are on the active-inductive load, the phase control unit is made in the form of a sequentially switched on phase-shifting e, one element, logical element AND, an amplifier and a pulse transformer, and the multiplier-dividing unit is made in the form of the first and second angles. impulse voltage dividers, resistor and comparator, the first input of the first coaxial impulse voltage divider and one output of the resistor form the first and second multiplying inputs, the input of the second controlled impulse voltage divider image a divider input, a first output pulse ugfavl emogo t divide voltage output forms reprographic-divider telnop) unit, an output of the second ugfavl emogo impulsno1 about nagf voltage divider and drugo11 terminal of the resistor connected to the input of the comparator, and an output connected to the latter Unravl to the inputs of the pulse voltage dividers and the upstream input of the logic element I.