SU1023300A1 - Two-stage d.c. voltage stabilizer - Google Patents

Description

The invention relates to electrical engineering and can be used in power supply systems. Multistage voltage stabilizers are known which consist of several linearly connected compensating stabilizers connected in series. A disadvantage of these devices is their low efficiency. Two stage stabilizers are known with a phase-impedance regulator in the first stage G3J .; The disadvantage of these devices is low speed. Closest to the proposed one is a two-stage stabilizer with a key thyristor regulator in which the first stage is .. Stabilizer .. the torus contains a power transformer c. I supra mitelem, power thyristor indented to Melsdu by the supreme output and the second stage input, which is used as a compensating hundred. bilizator, the output of which is connected to the output terminals, both stages are connected by interlaced feedbacks. In the first stabilizer stage, with a thyristor actuator, pre-stabilization is carried out and the high efficiency is provided here at the expense of the use of pulse regulation. In the second stage, with a transistor actuator, final stabilization is carried out by means of ordinary regulation at the expense of excess power. Since the control range in the second stage decreases and the power dissipated in the transistor increases. The efficiency of the stabilizer J. i However, for this (the stabilizer is characterized by large pulsations, especially when the load current decreases, this disadvantage accompanies phase adjustments. The purpose of the invention is to reduce pulsations by stabilizer output. The goal is achieved by the fact that a two-stage DC voltage stabilizer containing a power transformer with 1 OTM 1MteleM | S11LOVOY thyrist connected between the output of the detector and the second phase of the house, which uses a compensating stabilizer, the output of which is connected to the terminals, is additionally equipped with a two-position semiconductor relay with a given hysteresis and a coincidence circuit, and the relay input is connected to the input of the second stage, and the output is connected to the first input of the coincidence circuit, the second input of which, through a resistor and a stabilizer, is connected to the output of the rectifier. : Figure 1 shows the scheme of the proposed stabilizer; in fig. 2 - graphs of voltage changes at the main points. In the first stage, the stabilizer contains a regulating element on the power thyristor 1, included 1 Ш1й between supreme goal 2 and linear compensation stabilizer 3 as the second stage. A storage capacitor 4 is turned on between the two stages. The thyristor control circuit includes a two-position semiconductor relay 5, a coincidence circuit 8, a separating filter for powering the relay on diode 7 and a capacitor 8, a reference diode S, the Stabilizer works as follows. At the input of the first stage, a pulsating rectified voltage is formed (a, fig 2), at the output of the first stage a constant voltage is formed, smoothly varying by some max. max 1M, Uynax value and min. #) M, UviiiH (a, Fig.2), at the output of the second stage, the output voltage is stabilized, U0bjx "Uvriirr ibrat equal (1,2 - i, in order to ensure the minimum the margin for operation of the stabilizer .. pa 3, aUyyia is equal to (1.4 - l, 5) UBbix in order to ensure a frequency of pulsations at the input of the stabilizer 3, which is easily worked out last. Two-position semiconductor relay 5 fails when the voltage is on the condensation i -ope 4 is equal to fTiqx i (in, figure 2), and releases at voltages,. Levels of operation and release and relay 5 is provided with a regulating potentiometer, and when triggered, the voltage on its slider is greater than the sum (C –P C), and when released it is less than C, i.e. the hysteresis is determined by the voltage C. The turning on of the thyristor 1 occurs at the output signal of the circuit 6, (c, Fig. 2), i.e. with zero x on both of its inputs. At the first input, O appears when the relay is released, (%, Fig. 2) g at the second - during the voltage transition at the output of the crossbar through zero, dl

a reference diode 9 is used for this. When the input voltage is increased, the thyristor 1 is turned on for a smaller period p in reverse.

Solid state relay at low outputpoxmx. voltages should be sourced with a separate source of bias. With large fluctuations of resistance. ki loads, the supervised connection of the input of the relay is reasonable to remove from the output of the second stage. However, the speed is somewhat lower.

Elimination of high-frequency pulsations1 provided by the inclusion of a thyristor. 1, when the voltage passes through zero (low-frequency pulsations are easily eliminated by the stabilizer itself), it is necessary to expand the scope of the stabilizer, increase its cost-effectiveness and speed, without reducing the coefficient of efficiency.

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Claims (1)

TWO STAGE voltage regulator DC "comprising a power transformer with a rectifier, a power thyristor, which is included between the output pryamitelyai You are a second input stage which is used as a compensation regulator, whose output is connected to output terminals of m and ^{l, 4} ® and and In order to reduce output ripples, it is equipped with a two-position semiconductor relay with a given hysteresis and a matching circuit, with the relay input connected to the input of the second stage and the output to the first input Hema coincidence, the second input of which via a resistor and zener diode connected to the output of said rectifier. Ph. 1 1023300 2