SU962044A1 - Apparatus for controlling thyristor-pulsed regulator of traction motors of electric rail vehicles - Google Patents

Description

(54) DEVICE FOR CONTROLLING THYRISTOR IMPULSE CONTROLLER OF TRAFFIC ELECTRIC MOTORS

ELECTRIC MOBILE COMPOSITION

one

The invention relates to electrical equipment for vehicles with thyristor-pulse control of the starting and braking modes of the traction electric motors.

A device for controlling a thyristor-pulse regulator of a traction electric motor of an electric rolling stock is known, comprising a clock pulse generator connected to an input of a counter connected to an output of a decoder, the outputs of which are connected to one of the inputs of a switch, the other inputs of which are connected to the output of a reversible counter connected by one from the inputs with the output of the logical element OR, the inputs of which are connected to the output of the logical element AND, the output of the comparison unit and the output of the frequency divider, connect ennogo input from clock pulse generator, wherein one of the inputs of the comparison unit is connected to a source of reference voltage, and the other sensor 1 c.

A disadvantage of the known device is the constancy of the speed of recruiting and resetting the adjustment positions, resulting in significant overshoot current

voltage jumps in the network, which causes the occurrence of a circular fire on the collectors of traction engines.

The purpose of the invention is to increase the reliability of the device.

This goal is achieved by the fact that the device is equipped with an additional source of reference voltage, an additional comparison unit, an additional frequency divider, an inverting unit and an OR-NOT logic element, and

10, one of the inputs of the additional comparison unit is connected to an additional source of reference voltage, and the other is connected to the current sensor, and the output is connected to the input of an inverting unit connected to the output 5 house to one of the inputs of the logical element OR NOT connected to another the input of the reversible counter, and the second input of the OR-NOT logic element is connected to the output of the additional frequency divider, whose input is connected to the clock pulse generator.

The drawing shows a block diagram of the proposed device.

The generator 1 clock pulses connected to the counter 2 pulses, which through

the decoder 3 "is connected to the switch 4 pulse signals. The decoder 3 and the switch 4 are connected to shaper 5 and 6 control pulses for the thyristor controller. The switch 4 controls the reversible counter 8. The summing input of the counter 8 is connected to the logical element OR 9, which in turn is connected to the AND 10 logic element, the frequency divider 11 and the comparison element 12, which is controlled by the difference of the signals from the reference voltage source 13 and the sensor 14 motor current. The device also contains an OR-NOT logic element, 15, an additional frequency divider 16, an inverting element 17, an additional comparison element 18 and an additional source 19 of the reference voltage. The width of the counters 2 and 8 is the same, and the frequency of the clock pulses of the generator 1 is equal to; fj fp2, where fp is the control frequency, n is the bit size of the counters 2 and 8. The division factor of the main frequency divider 11 is chosen lower than the frequency of the fp control from the condition of a smooth set of control positions. The division factor of the additional frequency divider 16 is selected lower than the frequency divider 11. The level of the additional source 19, the reference voltage is selected higher than the level of the source 13 of the reference voltage by an amount corresponding to the permissible deviations of the motor current from the specified values (i.e. from the motor current setting).

The device works as follows.

The clock pulses from the generator 1 are fed to the input of the counter 2 and translate it from position to position. The signals from the output of counter 2 by the decoder 3 are converted into a sequence of pulses, repeated with the frequency of adjustment f. The pulse of the first position of the decoder 3 through the driver 5 turns on the thyristor controller 7. The switching off of the thyristor controller 7 is carried out by the output signals of the switch 4 through the driver of 6 pulses. The signal at the output of switch 4 appears when the codes at the outputs of counter 2 and 8 coincide. The state of counter 8 is set by signals from the frequency divider 11 via logic element 9 of type OR, which controls the state of the reference element 12 and the degree of filling of the counter bits eight.

The set of adjustment positions is as follows. At the initial moment of starting the motors, when their current is below the setpoint and the signal at the output of the motor current sensor 14 is lower than the reference voltage of source 13, there is no voltage at the output of comparison element 12. The discharges of the counter 8 at the initial time nyc ka are not filled, and the voltage at the output of the element 10 is absent. In this case, the OR 9 element transmits pulses from the frequency divider 11 to the summing input

counter 8, resulting in a sequential switching it from position to position. When the codes at the outputs of the counters 2 and 8 coincide, the output of the switch 4 generates a pulse signal that is phase-shifted relative to the pulse of the first position of the decipher 3 at an angle corresponding to the code of the counter 8. Thus, there is a gradual increase in the fill factor of the pulse-thyristor controller 7, and the motor current increases.

As the motor current increases above the set point, the voltage of the current sensor 14 exceeds the voltage level of the source 13 of the reference voltage and at the output of the reference element 12 a high level voltage appears that keeps the OR 9 element in one state, resulting in pulsed signals the frequency divider 11 is not transmitted to the summing input of the counter 8. The set of positions of the counter 8 is suspended, and the thyristor controller 7 operates with a fill factor corresponding to the positions at which the dialing was stopped, until a motor current is below the setpoint snizits. After that, a further set of positions begins again, and so on.

At the end of the adjustment process, when the discharges of the counter 8 are completely filled, a high level voltage is generated at the output of the element And 10, which keeps the element OR 9 in the same state. As a result, the pulses from the frequency divider 11 do not arrive at the input of the counter 8 and it is not reset to the zero state, ensuring the operation of the thyristor controller 7 with the maximum filling factor of the pulse cycle.

In the normal control mode, the newly entered circuit does not affect the operation of the counter 8, since the voltage of the sensor 14 corresponding to the motor current setting is lower than the reference voltage of the auxiliary source 19. In this case, the output voltage of the additional reference element 18 is absent, and the output voltage of the high level of the inverting element 17 keeps the OR-NOT 15 logic element in one state, as a result of which the pulse signals from the frequency divider 16 are not transmitted to the subtracting input of the counter 8.

When the motor current surges above the allowable values determined by the voltage level of the additional source 19, the output of the additional comparison element 18 appears to be a high level voltage, and it is removed from the output of the inverting element 17. In this case, the logic element 15 begins to pass the pulse signals from the divider 16 frequency to the subtractive input of the counter 8, which, under their influence, begins to reset the positions accumulated before it. The circuit of the set of positions of the counter 8 in this mode is locked, since at the output of the comparison element 12 there is a high voltage. Resetting the positions of counter 8 occurs at a more intensive pace than dialing, since the divider division factor of 1.6 frequencies is less than that of divider 11. This ensures a quick response of the control system of the thyristor regulator 7 to motor current surges. When the positions of the counter 8 are reset, the motor current begins to decrease. When it decreases below the allowable value determined by the level of the voltage of the additional source 19 of the reference voltage, the voltage from the output of the additional {{og6 of the comparison element 18 is removed, and the inverting element 17 transforms the element OR-NOT 15 into an excited state in which impulses from the additional divider 16 frequency to the counter 8 are not received. The reset of the positions of the counter 8 is terminated, and the main control circuit of the counter 8, i.e., the recruitment position chain, comes into effect.

Thus, the proposed device provides a fast response of the motor control system to current surges, which improves the quality of the control process and the reliability of the electrical equipment of the rolling stock.

Claims (1)

Claims. A device for controlling a thyristor-impulse regulator of an electric rolling stock traction motor, comprising a clock pulse generator connected to an input of a counter connected by an output to a decoder, the outputs of which are connected to one of the switch inputs, the other inputs of which are connected to the output of a reversible counter connected to one of the inputs the output of the logical element OR whose inputs are connected to the output of the logical element AND, the output of the comparator unit and the output of the frequency divider connected in one with the clock pulse generator, wherein one of the inputs of the comparison unit is connected to a source, a reference voltage, and the other is connected to a current sensor, characterized in that, in order to increase reliability, it is equipped with an additional source of reference voltage, an additional comparison unit, an additional frequency divider, an inverting unit and an ILINE logic element, with one of the inputs of the additional comparison unit being connected to an additional reference voltage source, and the other to the current sensor, and the output connected with the input of an inverting unit connected by an output to one of the inputs of an OR-NOT logic element connected to another input of a reversible counter, and the second input of an OR-NOT logic element is connected to the output of an additional frequency divider, the input of which is connected to a clock generator. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 394907, cl. H 02 P 5/16, 1974.