SU1202042A1 - Pulse shaper - Google Patents

Description

ny mode. The delay time G, of certain pulses of MB 11, based on the tagging of the parameters of the chain h, measure & j. - parameters of chains ft,

C, CTj. , and time parameters output1202042

R; Cj and Ci, .3 Il.

one

The invention relates to a pulse technique and can be used in thyristor control systems for static transducers, frequency controlled drives and other devices.

The aim of the invention is to reduce the power losses and heat of the control circuit of the cross-thyristor.

FIG. 1 is a circuit diagram of a pulse former; in fig. 2 is a schematic diagram of an implementation of a communication element, an adjustable delay element, and a controlled multivibrator; in fig. 3 - graphs of input and output signals on the main elements of the functional diagram.

The pulse shaper (Fig. 1) contains a power source 1, an amplifier 2 on transistors 3 and 4 and resistors. 5, 6 and 7. The common point of resistors 5 and 6 is connected to the positive pole of power supply 1, and the emitter of transistor 4 is connected to the negative pole of power supply 1, the collector of transistor 4 through resistor 7 is connected to the base of transistor 3 and resistor 6. 5 - with the emitter of the transistor 3. A communication element 8, to the input of which an input signal 9 is supplied, is output connected to an adjustable delay element 10, the output of which is connected to the inputs of a controlled multivibrator 11 and a delay element 12 consisting of a variable resistor 13 and a terminal sensor 14, the outputs of the multivibrator 11 controlled by it and the delay element 12 are connected to the inputs of a voltage divider 15 consisting of series-connected resistors 16 and 17, transistor 18 and capacitor 19 connected between the common point of resistors 16 and 17 and the emitter of transistor 18 connected to the negative pole of the power source 1, the output being controlled

: the multivibrator 11 is connected to the resistor 16, and the output of the delay element 12 is connected to the base of the transistor 18, the output of the voltage divider 15 is connected to

5 by the input of the amplifier 2, the common point of the resistors 16 and 17 being connected to the base of the transistor 4, the code of the pulse former connected to the control circuit of the thyristor 20, and

The collector of the transistor 3 is connected to the control electrode of the thyristor 20, and the negative pole of the power source is connected to the cathode of the thyristor 20. Communication element 8 is a transistor optocoupler U, which serves to connect and match the input source and the adjustable element delays, and includes fi resistors. and R2.

0 The element 10 of adjustable delay and controlled multivibrator 11 are built using microtimers G, GJ. type K1006BI1. The microtimer G turn on circuit provides a standby mode and a microtimer (J is a self-oscillating mode. The microtimer delay time G is determined by the parameters of the K,,,. - parameters of chains K., R, X.

Cj, C.

pulse generator works

follow suit.

In the absence of an input signal 9 at the output of the communication element 8 there is a signal 1, on the codes of the remaining functional units 10, 11, 12, 15

Q and amplifier .2 signals are equal to 0. With the arrival at time t of the input signal Uj (Fig. 3A), the signal Ug at the output of element 8 becomes O (Fig. 3B) -, and at the output

Claims (1)

j of the variable delay element 10 a voltage of 1 /, -logical 1 appears (fig. Sv). The controlled multivibrator 11 begins to generate rectangular-shaped pulses (J (Fig. 3g). The voltage C (Fig. Ai) at the output of the delay element 12 increases with the exponent, the transistor 18 opens with a time delay (time tj). until the moment when the transistor 18 is closed, all the voltage from the output of the controlled multivibrator 11 is applied to the input of the transistor 4 of the amplifier 2, the transistors 3 and 4 are fully open, the input voltage of the power source 1 is applied to the input of the thyristor 20. tj when t the razistor 18 opens, the voltage divider 15 starts to act on the resistors 16 and 17, the voltage at the input C (Fig. Ze) and the output U (Fig. Zg) of the amplifier 2 is reduced to the level determined by the resistors 16 and 17. At the time t the arrival of the next pulse from the output of the controlled multivibrator 11, the capacitor 14 of the element 12 is charged along the circuit: resistors 16 and 17 — the collector — the base of the transistor 18, the transistor 18 closes, the voltage on the voltage divider 15 increases, increases and its amplitude thyristor control pulse 20 (FIG. Ze, g). Then, as soon as the charge capacitor of the delay element 12 is completed, the amplitude of the control pulse of the Tiris 424 torus 20 remains at the level determined by the voltage divider on the resistors 16, 17 with the open transistor 18. Thus, a packet of pulses of optimal shape is formed, the first impulse of the pack has an increased amplitude. At the end of the time of the adjustable delay of the element 10, at the time t-c, the voltage at the outputs of the functional units 10, 11, 12, 15 and 2 decreases to 0. The circuit returns to its original state. The claims of the pulse shaper comprising a power source, an adjustable delay element, an amplifier on two transistors, differing in that, in order to reduce power losses and heat up the control circuit of the power thyristor, a controlled multivibrator, an additional delay element and a controlled voltage divider, with the inputs of the controlled multivibrator and the additional delay element connected to the output of the variable delay element, the outputs of the controlled multivibrator and the additional Nogo delay element connected to inputs of the voltage divider, and an output voltage divider is connected to the input of the amplifier. 2