SU1099360A1 - Logic switching unit for device for control of reversible rectifier converter - Google Patents

Abstract

LOGICAL UNIT DEVICE FOR SWITCHING CONTROL reversibly controlled converter comprising a predetermined direction of the current sensor, the presence of a current sensor, the time delay element, two AND-NO element, R -trigger, diodes, inverter, whose output is connected to the input of the first AND-NOT outputs the first and second elements are NOT connected to the corresponding inputs of the RS flip-flop, the outputs of which are connected via diodes to the corresponding control terminals of the valve converter, which, in order to simplify and improving the quality of regulation, the bottom of the NAND element is entered, the output of the sensor of the specified current direction is connected to the first INPUT of one element, the output of the inverter is connected to the first INPUT of the second element AND –NO, to the (A) the presence of current, the outputs of these elements are connected to the corresponding control terminals of the valve converter.

Description

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The invention relates to electrical engineering and can be used to control DC and AC converter valves.

A logical switching unit of a device for controlling a reversing transducer is known, comprising a null organ, a predetermined current trigger, a true current direction trigger, a trigger match element whose inputs are connected to the corresponding trigger outputs, a time delay node connected by an input to the output of the coincidence element, and an output - to the inlet - rigger true direction of current 1.

The disadvantages of this device are the complexity caused by the use in the circuit of two triggers and the coincidence circuit, which necessitates the installation of six redundant AND-NOT elements, as well as unreliability.

The closest in technical essence to the present invention is a logical switching unit of the device for controlling a reversible valve converter containing a sensor of a predetermined current direction and current, time delay elements, AND, OR, NOT and -RS-TpHrrep elements connected by inputs to time delay elements , and outputs - to the elements OR 2,

However, in the known device, the time lag element is connected in series with the trigger input. This combination of elements leads to the fact that to switch on the LCP in both positions with pauses in series with the second trigger input, it is necessary to turn on the second time delay element, which complicates the circuit, moreover, due to the inclusion of two time delay elements at the trigger inputs, counted by these elements, are uneven (in practice, they can differ by 30-40% due to the variation of the nominal parameters of RC-elements), which leads to switching sets of thyristor converter sets with different pauses and. This impairs the quality of regulation of the thyristor converter.

The purpose of the invention is to simplify and improve the quality of control of a valve converter.

This goal is achieved by the fact that the logical switching unit of the device for controlling the reversing valve converter contains a sensor of a given current direction, a current presence sensor, a time delay element, two AND-NOT elements, RS triggers, and diodes.

an inverter whose output is connected to the input of the first NAND element, the outputs of the first and second NAND elements are connected to the corresponding inputs of the RS flip-flop, the outputs of which are connected via diodes to the corresponding control terminals of the converter valve, to the two the output of a sensor of a given current direction is connected to the first input of a single NAND, the output of the inverter is connected to the first input of another NAND, the output of a current presence sensor is connected to the second inputs of the NAND elements, the outputs of these elements are connected Dineny with the appropriate control terminals of the valve converter.

The drawing is a schematic diagram of a logical switching unit for a reversing valve converter.

The device contains a sensor 1 of a given direction of current, a sensor 2 of current, an inverter 3 connected to sensor 1 and elements of NAND 4 and 5 connected to RS trigger B, outputs R5 trigger 6 through diodes 7 and 8 are connected to control terminals B and H of the valve converter, with which the outputs of the additional elements AND-HE 9 and 10 are also connected, the first inputs of these elements are connected to the outputs of sensor 1 and inverter 3, and the output of the element 2 and input of the elements 9 and 10 are connected to the second inputs of elements 9 and 10 11 times the output of which is connected to the second inputs elements 4 and 5. I

The device works as follows.

If sensor 1 and sensor 2 have signals 1 at the output. Inverter 3 sets the signal O and the first inputs of the AND-HE elements 4 and 5 receive the signals O and 1, respectively. This causes the RS-trigger 6 to turn on to the position where the O and B outputs have the signals O and 1, respectively. This is done by operating the gate converter back.

When changing the given direction of current, ij to the opposite.

but the presence of a current in the valve converter, the signals at the outputs of the LPU Vin do not change, since the second inputs of the AND-HE elements 9, 10 and 4, 5 through the time delay element 11 receive a blocking signal from the current presence sensor 2. Inverting current is in progress. When it goes down to zero, the output signal of sensor 2 becomes equal to 1,

5, the start of the pause begins

The output element 11 of the time, the output signal of which is still O. The output signals of the AND-HE elements 9 and 10 become equal to 1 and O, respectively, which leads to the setting of O signals on both LYU outputs and both sets of valve converter valves are turned off for a pause. in hospitals. After a pause count, the signal at the output of the time lag element 11 becomes equal to 1, blocking is removed from elements 4 and 5, and the RS flip-flop 6 switches to a new position, which leads to

the appearance of the signals 1 and O at the outputs of the H LPU. The valve converter starts to work forward. In the event of a current occurring during the pause countdown, when the Re-trigger 6 is still in its previous position, the output signal of the current presence sensor 2 (equal to O) embraces the time delay element 11 and blocks the elements 4, 5 and 9, 10. The signals on The outlets of the health facilities begin to correspond to the outputs of the RS-trigger, i.e., to the previous state of the health care facilities, and the previously operated valve set is activated.

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Claims (1)

LOGIC SWITCHING UNIT OF THE DEVICE FOR CONTROL OF THE REVERSIBLE VENTILY CONVERTER, containing the set current direction sensor, current presence sensor, time delay element, two NAND elements, 6¾-trigger, diodes, · inverter, the output of which is connected to NOT the input of the first element the outputs of the first and second elements AND are NOT connected to the corresponding inputs of the RS-flip-flop, the outputs of which are connected via diodes to the corresponding control terminals of the valve converter, characterized in that, in order to simplify and increase eniya regulation quality administered two AND-NO element, to first input of AND-NO element is connected the output a predetermined current direction sensor to the first input of the second element © The inverter output is NOT connected, the current presence sensor output is connected to the second inputs of the elements. The outputs of these elements are connected to the corresponding control terminals of the valve converter. SU ... 1099360