SU855970A1 - Saw-tooth voltage shaping device - Google Patents

Description

(54) DEVICE FORMATION OF THE TIMBER

one

The invention relates to the conversion of electrical signals and can be applied to phase shift devices of the vertical principle of action.

Devices for forming reference voltages, having a sawtooth shape and devices for forming unipolar and alternating reference voltages of the said form, are known based on the use of the result of a change according to a certain voltage or current law on a reactive element, as well as on summation of several non-phase voltages 1.

The closest in technical essence to the present invention is a sawtooth voltage forming device comprising three transformers, the primary windings of which are connected to a star and connected to the terminals of a sinusoidal, three-phase voltage source, two half-wave rectifiers, each of which consists of a diode and a secondary, transformer windings, the outputs of which are shunted by resistors and are connected in series with each other and with the re-voltage

The winding of the third transformer 2.

The disadvantage of this device is the substantial non-linearity of the falling portion of the generated reference voltage. As a result of this, there is a lack of 5 gain and a deterioration in the quality of transients.

The purpose of the invention is to improve the shape of the output voltage.

The goal is achieved by the fact that the Q primary windings of two transformers, the secondary windings of which are included in the half-wave rectifier circuits, are bridged by capacitors and connected to the input terminals via additionally inserted diode bridges with 15 diagonal connectors and in series with the secondary winding of the third transformer trimmer resistor.

FIG. 1 is a schematic diagram of the device; in fig. 2 - voltage diagrams are given.

20

The device contains single-phase transformers 1-3, the primary windings of which are connected in a star and connected to a three-phase network, while the primary windings of transformers 1 and 2 are bridged by capacitors 4 and 5 and connected to the corresponding phases of the network through diode bridges 6 and 7 with chokes 8 and 9 diagonal x. The secondary windings of these transformers 1 and 2 are connected in series and loaded with an equal-arm divider 10 through diodes 11 and 12, while the middle point of the divider 10 is connected to the common point of the secondary windings of transformers 1 and 2. The secondary winding of transformer 3 is connected in series with divider 10 through a variable resistance 13 The output reference voltage is removed from equal shoulder divider 14. The operation of the device is explained by the voltage diagrams in FIG. 2. In a three-phase alternating voltage at the input of the device (Fig. 2a), the sinusoidal voltage of phases A and B with the help of L-C circuits consisting of inductances of chokes 8 and 9, capacitors 4 and 5 is transformed into a triangular shaped voltage {fig. 26), which is transformed by transformers 1 and 2 into secondary circuits. In the secondary circuit, each of these voltages is rectified in a half-wave rectification scheme using diodes 11 and 12, with different signs summed at divider 10. Phase C voltage through transformer 3 without transformation is transformed into secondary circuit and summed with voltage divider. 10. The resulting voltage (Fig. 2c) is removed from divider 14. By alternating resistance 13, the linearity of the falling portion of the output reference voltage is corrected. The proposed device for the formation of the reference voltage favorably

Claims (2)

0 from the parameters of the process of controlling the phase of the control pulses in the phase shifting devices of the vertical principle of operation known for their simplicity and improvement. Isoberetin Formula A sawtooth voltage forming device containing three transformers, the primary windings of which are connected to a star and connected to the terminals of a three-phase sinusoidal voltage source, two half-wave rectifiers, each of which consists of a series-connected diode and a secondary half-wave rectifier. single-half-rectifier outputs are shunted with resistors and connected in series with each other and with the secondary winding of the third transformer, o It is distinguished by the fact that, in order to improve the output voltage form, the primary windings of two transformers, the secondary windings of which are included in the circuits of half-wave rectifiers, are connected by capacitors to the input terminals through additionally introduced diode chips with droplets in diagonals, and The secondary winding of the third transformer includes a trimming resistor. Sources of information taken into account in the examination 1. The author's certificate of the USSR, №, cl. H 02 R 13/16, 1970. 2. The journal "Electricity, № 9 1966 p. 59--62.