SU1739460A1 - Voltage regulating device - Google Patents

Abstract

Usage: the invention relates to electrical engineering and can be used on an electric rolling stock as an auxiliary power source and recharge battery. SUMMARY OF THE INVENTION: Introducing a fully controlled charge thyristor 1 and turning on the reactor 3 between the cathode of the additional thyristor 7 and the first terminal of the second capacitor 4 allows adjusting the charge range of the capacitors when charging thyristor 1 is turned on. This expands the output voltage control range and reduces losses. in the capacitor charge circuit, thereby achieving the goal. 1 il.

Description

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The invention relates to a converter technique and can be used on an electric rolling stock as a power source for control circuits and charging batteries.

A device for voltage control is known, which contains capacitors, recharge reactors and two thyristor groups.

The disadvantages of the known device are low efficiency with a relatively small range of load variation.

It is also known a voltage regulating device comprising two series-connected and connected between the input terminals of a capacitor, two chains of series-connected thyristors and a reactor, the first of which is connected to the terminals of a single capacitor through the output terminals.

Closest to the proposed technical essence and the achieved result is a voltage regulating device containing serially connected charge thyristor, charge and recharging reactors, the first and second capacitors connected to the power supply terminals, and the thyristor anode is connected to positive terminals , recharge reactor and capacitors are shunted by a recharge thyristor, the cathode of which is connected to the minus terminal of the power source, between the point of connection of the reactors with the anode p An additional thyristor is connected to a common thyristor and a common capacitor point, a load is connected to the terminals of the second capacitor, and an anode of the additional thyristor is connected to the junction point of the capacitors.

However, the known device does not have the ability to regulate the charge range of the capacitors when the charge thyristor is turned on. This leads to a decrease in efficiency and a decrease in the range of adjustment of the output voltage.

The aim of the invention is to increase efficiency and improve weight and size parameters.

In a device containing a charge thyristor, the anode of which is connected to a positive terminal for connecting a power source, a recharge thyristor, first and second capacitors, terminals for connecting s loads combined with the first and second terminals of the second capacitor, a reactor and an additional thyristor, the anode recharge thyristor combined with the second output of the second capacitor and a negative output for connecting the power source, the charge thyristor is made fully controllable, the cathode of the charge thyristor is combined Inen with the anode of the recharged thyristor and the first output of the first capacitor, the anode of the additional thyristor is connected to the cathode of the charge thyristor, the cathode of the additional thyristor is connected to the second output of the first capacitor, and

between the second output of the first capacitor and the first output of the second capacitor is turned on the reactor.

The proposed device differs from the known one in that a fully controllable key element is introduced into it, and the reactor is connected between the capacitors.

The drawing shows a circuit diagram of the proposed device,

The device contains a series-connected fully controlled key element, for example, a two-step thyristor 1, a first capacitor 2,

reactor 3, the second capacitor 4 connected between the positive and negative terminals of the source 5. A load 6 is connected to the plates of the capacitor 4. The reactor 3 and the capacitor 4 are bridged by the first thyristor 7, the anode of which is connected to the minus of the power source 5. A second thyristor 8 is connected between the cathode of the thyristor 1 and the anode of the thyristor 7 in a direction conducting with respect to the power source 5.

The device works as follows

After turning on the thyristor 1, the oscillating charge of the capacitors 2 and 4 starts through the reactor 3 from the power supply 5.

The duration of the on state of the thyristor 1 can be controlled within the time interval determined by the parameters of the reactor 3 and capacitors 2 and 4. When the current of the reactor 3 reaches a certain value, the thyristor 1 is turned off and a control signal is simultaneously applied to the thyristor 7, as a result of which the reactor 3 flows on the contour: reactor 3 - capacitor 4 - thyristor 7.

After reducing the reactor current to zero, the thyristor 7 is turned off, and the capacitor 4 is discharged to the load 6 (for example, the primary winding of the transformer). Turning on the thyristor 8 causes the reloading of capacitors 2 and 4 through reactor 3, as a result of which the energy of capacitor 2 is redistributed between these capacitors. After the recharge current is reduced to zero, the thyristor 8 is turned off, and the capacitor 4 is discharged to the load circuit, forming the second half of the AC voltage.

The technical and economic advantage of the proposed device in comparison with the known one is the possibility of regulating the voltage on the plates of capacitors, which improves the weight and size characteristics of the device, reduces losses in capacitor charge circuits and increases efficiency by 10-15%.

Claims (1)

Claims An apparatus for voltage control comprising a charge thyristor, the anode of which is connected to a positive terminal for connecting a power source, a recharge thyristor, first and second capacitors, terminals for connecting a load combined with the first and the second terminals of the second capacitor, the reactor and an additional thyristor, the cathode of the recharged thyristor combined with the second output of the second a capacitor and a negative terminal for connecting a power source, characterized in that, in order to increase efficiency and improve mass and overall performance, the charge thyristor is fully controlled, the cathode of the charge thyristor is combined with the anode of the charge thyristor and with the first output of the first capacitor, the anode of the additional thyristor is connected to the cathode of the charge thyristor, the cathode of the additional thyristor is connected to the second terminal of the first capacitor, and between the second terminal of the first capacitor and the first terminal of the second terminal ensatora included reactor.