SU1066024A2 - Device for rectifier converter control - Google Patents

Abstract

I WILL BUILD FOR MANAGEMENT OF THE VENTILAL CONVERTER on the autor. 851735, that is so that, in order to improve the accuracy of controlling the output voltage of the converter, the accumulator element of the integrator is key-bounded through a source of constant voltage.

Description

(L

with

Oi 05 Oh

The invention relates to electrical engineering, in particular to converter equipment, and can be used in controlled rectifiers,. inverters driven by the network and pulse-width converters. According to the main auth. No. 851735 a device is known that contains a TsII generator, whose output is soy (dinine is about a source of control voltage, an output voltage sensor of a converter connected to the inputs of integrators, accumulative elements of which are bridged by a key1-1I comparator, the first input of which is connected to the source control voltage, the second input is connected via separation diodes to the integrator outputs, and the output serves to connect the valve converter, the pulse distributor, whose input is connected to the output its generator and outputs are connected to the control inputs of the keys. The device allows controlling the output voltage of the converter, switching the current of the additional voltage channel. The drawback of the device is the low accuracy of the output voltage regulation of the converter, which is a consequence of the relatively small amplitude of the sawtooth the voltage supplied through the separation diodes to the second input of the comparator. The purpose of the invention is to improve the accuracy of controlling the output voltage of the converter. This goal is achieved by the fact that in the device for controlling the ventilator, the accumulator element of the integrator is bridged with a key through a constant voltage source. . Such an embodiment of the device makes it possible to double the amplitude of the saw-tooth voltage at the output of the integrators and thereby increase the control accuracy. Figure 1 shows the principle on the device diagram; Fig. 2 shows a block of a constant voltage source; and Fig. 3 shows timing diagrams plotting the operation of the device. The device contains tasks. generator 1, connected to the input of the source 2 of the control voltage. A NIN and the input of the distributor of 3 pulses, the outputs of which are connected to the control inputs of the keys 4 connected to one plate of accumulator elements (capacitors) 5 of the integrators 6, made on the operating amplifiers 7. The inputs of the conductors are connected to the output of the sensor 8 of the output voltage of the converter, and the outputs through dividing diodes 9 are connected to the first input of the comparator 10, to the second input of which is connected the output of the source i of the equal voltage. The DC voltage source unit 11 (Fig. 2) has terminals D2 and 13. In Fig. 3, there are diagrams of output pulses: a master oscillator (Fig. 3a); pulse distributor (fig.Zb, c); integrators (Fig. 3d, control voltage source TsHfig.Ze); A comparator (FIG. 3 g) of a constant voltage source L /. . The principle of operation of the device is -. It is as follows. The master oscillator 1 generates short pulses with a frequency equal to the modulation frequency of the boost voltage (Fig. 3a), which arrive at the input of the 3 distributor pulses. The 3 distributor pulses produce pulses (.fig.b, c) that are shifted relative to each other by half a period , using keys 4, connecting accumulative elements 5 with sources of constant voltage 11. At those times when the second plate of capacitors 5 is connected to switches 11 with constant voltage source 11, Sntas S are recharged for a short period of time before the voltage of the sources 11. At the output of the integrators 6, sawtooth voltage pulses U-) i (FIG. 3 d, d) are generated, which are fed to the second inlet cog / 1parator 10 through the separation diodes 9 and compared with the control voltage Uy supplied to the first input of the comparator 10 (Fig. Ze). At a voltage and a lower voltage Uy, the comparator 10 is in a state corresponding to the switched-on interrupter transistor. When the voltage Ufi is greater than or equal to the voltage Uy, the comparator 10 changes to the state corresponding to the switched-off transceiver interrupter transistor -Sfig.C g). As can be seen from FIG. 3 d, the minimum value of the sawtooth voltage coming from the integrators is equal to the voltage of the constant search source U, which is chosen close to the minimum possible output voltage of the operational amplifiers. In this way, . The output ramp voltage of the integrators can vary from the lowest possible voltage of the operational amplifiers to the maximum possible. Due to this, j, the range of voltages, in the cedor, it is possible to compare the sawtooth voltage of the integrators with the control voltage Tsu, is doubled compared with the prototype. FIG. It can be seen that the voltage U, i varies from zero to the maximum possible, whereas in the prototype this voltage can vary from half the maximum possible voltage to its Full value.

It should be noted that the introduction of additional voltage sources slightly complicates the device, since these sources are easily realized with the help of an additional high-frequency transformer, to which the third windings are connected.

710

Half-wave rectifiers with a capacitive filter (Fig. 2). The number of transformer secondary windings is determined by the number of integrators, the input is 1 x into the device.

Thus, the proposed device, in comparison with the prototype, has a wider zone of regulation. Increasing the amplitude of the sawtooth voltage increases the sensitivity of the device, this allows a significant improvement in the ka. honestly and improve the accuracy of the output voltage control of the converter. In addition, the integrators in the device operate in a more favorable mode as compared with the prototype, since their output voltage in each period is almost c and F netirically relative to zero,

Opt

fpi / f.2

Claims (1)

[54) DEVICE FOR CONTROL OF VENTILY CONVERTER by ed. No. 851735.0 T L, which means that in order to increase the accuracy of regulating the output voltage of the converter, the integrator storage element is shunted with a key through a constant voltage source.