SU1176311A1 - Pulse a.c.voltage stabilizer - Google Patents

Abstract

AC PULSE STABILIZER containing a step-up autotransformer, an integrating filter whose input is shunted by a two-pole recuperating node, the control input of which is connected to the synchronization node, and a key regulating element, the control input of which is connected to the output of the control node whose input is connected to the output of the gate Odes, characterized in that, in order to improve efficiency and reduce weight and dimensions, in it the input of the autotransformer is connected to the input terminals through a key element, and its output - to the input of the integrating filter. Figure 1 (L O5 00

Description

The invention relates to electrical engineering, in particular, to tetany electronic equipment.

The purpose of the invention is to increase efficiency and reduce the weight and size of the stabilizer.

Fig. 1 is a schematic of a pulse voltage regulator; Fig. 2 shows an example of the execution of the control node and the synchronization node;

The stabilizer contains a regulating element 1, a step-up autotransformer 2, a two-pole recovery unit 3, an integrating filter 4, which consists of the chokes 5 of the integrating filter and the capacitor 6 of the integrating filter, the control unit 7 and the synchronization unit 8. A load 9 is connected to the output pins of the stabilizer.

The circuits of control unit 7 and synchronization unit 8 (FIG. 2) contain rectifier 10, low pass filter 11, reference voltage source 12, summing element 13, sawtooth voltage generator 1A consisting of a Schmitt trigger 15 and integrator 16, trigger Schmitt 17, tokozadayushchy resistor 18, optocoupler 19, matching unit 20, the output of which is connected to the control input of the key regulating element 1. The optocoupler 20 consists of a transformer 21, the primary winding of which is connected to the mains, the rectifier 22, the capacitor 23, the current-setting resistor 24 and the base resistor 25. The synchronization circuit 8 consists of an optocoupler 26 and a matching unit 27, similar to the matching unit 20. The output of the matching unit 27 is connected to the control input of the two-pole recovery device 3, which serves as a key element similar to the key regulating element 1,

The stabilizer works as follows.

The frequency of operation of the control circuit 7 and, therefore, the key regulating element 1 is chosen much higher than the frequency of the power supply network, and rectangular impulses are received at the input of the integrating filter 4, the envelope of which represents sinusoids whose frequency is equal to the power supply frequency. At the moment when the key regulating element is released, the voltage through the autotransformer 2 and the choke 5 of the integrating filter enters the load 9. At the same time, the induction of the magnetic field in the core of the autotransformer 2 begins to change, and the choke 5 and the capacitor 6 of the integrating filter begin to accumulate electrical energy. When the key regulating element I is closed, the throttle 5 begins to unload to the load 9 through a two-pole recuperating device 3, which is controlled by the synchronization circuit. At the same time, the output of the autotransformer is shorted to open with a two-pole recovery device.

Consequently, at the moment of pause, the voltage on the load 9 is maintained at the expense of the energy stored in the drosel and the capacitor of the integrating filter, and the magnetic induction in the core of the autotransformer remains almost constant.

An integrating filter converts high frequency voltage pulses taken from the output of the autotransformer into alternating voltage with a network frequency. The value of THIS voltage is determined by the duty cycle of the key regulating element, the frequency of which is much higher than the frequency of the network.

In the stabilization mode, the duration of the current pulses through the key regulating element is automatically controlled by the control device 7 and depends on the voltage at the output of the stabilizer.

The voltage from the output of the stabilizer is fed to the input of the slider 10 and the straightened by it is filtered by filter 11, as a result of which the output component of the filter produces a constant component voltage from the output of the rectifier 10, which is directly proportional to the amplitude of the max. Voltage of the stabilizer . At the output from the measuring element} 1ta 13, the sawtooth voltage coming from the output of the sawtooth voltage generator 14 will be shifted relative to the zero level by a voltage equal to the difference between the output voltage of the filter and the Reference voltage removed from the source 12 of the reference voltage . In this case, the Schmitt trigger 17 is periodically transferred from one state to another, and from its output voltage impulses of a certain duty cycle occur. When the voltage at the output of the trigger 17 is positive, a current flows through the current setting resistor 18 and the diode of the optocoupler 19, which in turn causes current to flow through the transistor of the optocoupler 19. The magnitude of this current is determined by the output voltage of the trigger resistor 18, characteristics the optocoupler 19 and the parameters of the block 20 matching, i.e. the current-setting resistor 24 and the voltage at the output of the rectifier 22. The current through the transistor of the optocoupler 19 causes the opening of the key regulating element 1. At the same time, the current through the diode of the optocoupler 26 does not flow, because the reverse polarity bipolar recovery device 3 is closed. When the polarity of the voltage changes. At the trigger output, the 17.current flows through the current-setting resistor 18 and the optocoupler diode 26, thereby causing the opening of the two-pole recuperating device 3 and the closing of the key regulating element 1, as if a negative voltage appears at the output trigger Paragraph 17, the diode of the opron 19 is closed, the current through the transistor of this optocoupler stops and, therefore, the key regulating element 1 is closed. The ratio of the voltage transfer from the output of the filter 11 to the input of the summing element 13 and, consequently, the duty cycle of the trigger 1 and the key regulating element can be achieved so that the voltage amplitude at the output of the stabilizer becomes nominal. After that, its value will be maintained automatically, since when the output voltage changes due to the voltage change at the output of the filter 11, the sawtooth voltage shifts relative to the zero level at the output of the summing element 13, and consequently, the pulse ratio at the output of the trigger 17. As a result This will change the duty cycle of the key regulating element 1 and the amplitude of the output voltage of the stabilizer, which will again become close to ns-negative (due to the negative feedback ). Since the magnetic induction in the core remains constant when the key regulating element is closed, such a circuit construction reduces the estimated power of the autotransformer, since the calculated transformer power is directly proportional to the product of the maximum effective current through the input winding by the maximum average voltage the input voltage of the autotransformer during the positive half-wave of the mains voltage, which is directly proportional to the ratio of the amplitude of the mains voltage and duty ratio operation key regulatory element. But from the principle of the proposed device, it follows that this ratio is equal to the minimum amplitude of the mains voltage. In the case of the prototype stabilizer, the maximum average value of the input voltage at the input of the autotransformer is directly proportional to the maximum amplitude of the network voltage. The maximum value of the effective current through the input winding is the same in both cases. Therefore, the calculated power of the autotransformer of the prototype is so many times more than-. the even power of the autotransformer of the proposed device, how many times the maximum possible amplitude of the mains voltage is more than the minimum possible. Reducing the estimated power of the autotransformer allows for a reduction in the magnetization reversal loss. core and reduce ohmic losses in its windings. In addition, this means that the weight and dimensions of the Autotransformers are reduced. The trans-impulse voltage regulator circuit allows increasing the efficiency while reducing the weight and dimensions of the stabilizer.

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Claims (1)

PULSE AC VOLTAGE STABILIZER, comprising a step-up autotransformer, an integrating filter, the input of which is bypassed by a bipolar recuperating unit, the control input of which is connected to the synchronization unit, and a key control element, the control input of which is connected to the output of the control unit, the input of which is connected to the output terminals , characterized in that, in order to increase efficiency and reduce weight and dimensions, in it the input of the autotransformer is connected to the input terminals through a key control element nt, and its output - to the input of an integrating filter. SU. ,,, 1176311