SU1173511A1 - Apparatus for controlling a bridge converter - Google Patents

Abstract

A DEVICE FOR CONTROLLING A BRIDGE TRANSMITTER, containing a pulse-phase control unit with outputs according to the number of fully controllable bridge converter converters, a phase control output of the output pulses of the pulse-control unit through an amplifier with antiphase inputs and a mode switch contact connected to a source control unit, and a mode control signal source. that, in order to increase the speed of switching the operating mode, it is equipped with logic switches according to the number of gates, the switch The output is provided with additional contacts, the output of each logic switch is designed to be connected to the control input of the valve, the information inputs are connected first to the corresponding output of the pulse-phase control unit, the second to the anti-phase output, and the control input via the additional contact (L contacts of the mode switch connected to the power rail and common bus device.

Description

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The invention relates to electrical equipment and can be used in power modules and slave inverters.

The purpose of the invention is to increase speed .5

FIG. 1 shows a diagram of the device; in fig. 2 and 3 - time diagrams.

The bridge converter is formed by six two-operation fully-controlled valves (for example, electronic) 1-6, the control inputs of which are connected to the voltage switches of the switches consisting of the elements OR 7-12, the inputs of each is of which are connected to the outputs of the two elements And 13 - 24. To one input of each element And connected to the output of the unit 25 pulse-phase control. At the same time, each output of block 25-20 is connected to two elements 13-14. The input of block 25 is connected to the output of amplifier 26, which has two inputs, direct and inverse, to which a control signal is connected through the first contact of mode switch 27-25. The second contact of the switch 27 is connected by an average output to the second inputs of the elements 14, 16, 18, 20, 22 and 24 and to the input of the element NO 28. Extreme water of this contact is connected to the ground by a common bus and Ш1-1IO power supply (+) . Gates 1-6 - electronic. They are open when there is a signal and closed when there is no signal. ,

The device works as follows.

The converter in a known manner converts the energy of direct current into alternating or vice versa. Transistors or electronic gates can be used as Q 1 - 6 gates. When a signal is applied to the control input of the valves 1–6 from the output of the HJM 7-12 element, the corresponding vents are opened, and when the signal is removed, they are closed. The work of the Converter is periodic in a certain sequence of opening

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and closing the valves. This sequence of pulses is generated by block 25, the output pulses of which are fed to AND elements 13-24. The phase of these pulses is determined by the size of the control signal applied to the input of amplifier 26. Amplifier 26 supplies this signal through a direct or inverse input, which is determined by the position first contact switch 27.

FIG. Figures 2 and 3 show diagrams of the converter operation in the mode of natural (EC) and artificial switching (IR). For the cathode group (valves 1, 3, 5), the voltage is shaded, and for the anode group (valves 2, 4, 6) they are shown by dotted lines. Numbers 1–6 correspond to the beginnings of control pulses. The duration of the impulses is 120 °. As can be seen from the diagrams, in order to switch from EC to IR mode or vice versa, the initial phase of the pulses must be changed by 180. When switching the switch 27 with the first contact (upper), the direction of adjustment changes, as in a known device. The second contact 27 allows the passage of pulses to the valves 1 - 6 through the circuit And 14, 16, 18, 20, 22 and 24 in the upper position. In this case, the element NOT 28 supplies the remaining elements AND the locking signal O. In the lower position, the switch to the input of the elements 14, 16, 18, 20, 22 and 24 is given a zero signal, and to the remaining elements 11, 15, 17, 19 , 21, 23 from the output of elements. That is NOT 28 - the opening signal.

With such a switch, the change of the phase of the pulses applied to the gates 1 - 6 occurs by 180 phases. This transition occurs almost instantaneously, because an electronic circuit is used as the switch 27. Due to this, the speed becomes extremely high, which leads to an improvement in the shape of the output voltage. / B ui.2 - dO IC (pus, 3

Claims (1)

DEVICE FOR CONTROL OF A BRIDGE CONVERTER, containing a pulse-phase control unit with outputs according to the number of fully controlled gates of the bridge converter, a phase control input terminal of the output pulses of the pulse-phase control unit through an amplifier with antiphase inputs and mode switch contacts connected to a control signal source, characterized in that that, in order to improve the speed of switching the operating mode, it is equipped with logical switches according to the number of gates, the mode switch equipped with additional contacts, the output of each logical switch is designed to be connected to the control input of the valve, the information inputs are connected to the first one with the corresponding output of the pulse-phase control unit, the second to the opposite-phase output, 1S, and the control input is connected to the bus via additional contacts of the mode switch power and common bus device. SU.,., 1173511 • 1 11735