SU790206A1 - Multiphase controllable time interval generator - Google Patents

Description

(54) MULTI-PHASE GENERATOR OF REGULATED TIME INTERVALS

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The proposed multiphase generator of adjustable time intervals relates to the pulse of the infra-low range and can be used to form a sequence of regulating "1x time intervals in installations for various purposes and, in particular, is intended for use in automatic control systems for switching 10 regenerative heat exchangers as a basic unit generating a sequence of adjustable time intervals.

Multiphase generators are known that contain time master cells on bipolar transistors, interconnected time master capacitors, and time master resistors 20 simultaneously perform the function of setting the DC mode in the transistors, since they are included in the circuits without the last l. .

The disadvantages of these circuits are 25 low values of time intervals worked out by them, limited by low resistance of input and output circuits of cells and low limit values of resistance 30

Research institutes of resistors in chains without bipolar transistors.

The closest to the invention to the technical essence i the achieved result are multiphase generators containing time master cells made on the basis of an RC circuit connected to a threshold cascade with a winding of the output relay as a load, and the communication between the cells electromagnetic relays. In this device, it is possible to implement large quantities of time intervals

15 by performing a threshold cascade on field effect transistors 2.

The disadvantage of this generator is the low accuracy of time interval processing, overestimated power consumption and reduced device reliability when operating in large time intervals, due to the fact that the capacitors of the driving RC circuits in the cells are not shunted by low-resistance resistors for the time preceding the start of the time interval This cell does not completely remove the residual voltage on the capacitor.

which leads to temporal instability of the values of the time intervals worked by this cell and, as a result, to a decrease in the accuracy of the processing of the sequence of adjustable time intervals.

The power consumption of the whole device can be reduced by connecting the time of the master cells to the power source not all at once, as was done in the B prototype, but successively at the moments of the beginning of the time interval processing by this cell.

The purpose of the invention is to improve the accuracy of working out adjustable time intervals, reduce energy consumption and increase the reliability of the entire device as a whole.

This goal is achieved by the fact that in a multiphase variable-time generator, containing time master cells based on an RC circuit connected to a threshold stage with an output relay winding as a load, the break contacts of the output relays of previous cells are connected via limiting resistors in parallel time specifying the capacitors of the subsequent cells, the closing contacts are connected between the positive bus of the stabilized power source and the RC circuit input, the breaking contact output the last cell relay is connected between the winding of the blocking relay and the positive bus is-. a stabilized voltage point, which in turn is connected via parallel-connected make contacts of an interlock relay, an external automatic start relay and a manual start button to the common plus power bus.

FIG. 1 shows a diagram of a multi-phase generator of adjustable time intervals; in fig. Figures 2 and 3 present experimental oscillograms that explain the principle of operation of the proposed multiphase generator of adjustable time intervals.

The generator-contains the time of the master cells l- (l-n) with output relays 2- (), diodes 3-3 (n + 1), shunting all the code relays; switching contacts 4-4 (p-1), blanking relay 5, closing contact 6 .Blocking relay, closing contact 7 of the output relay of the last stage, closing contact 8 of the external start relay, manual button 9, source of stabilized voltage supply at the Zener diode 10 and a resistor 11, a positive power supply bus 12, a negative bus 13 of a stabilized voltage source, a common grounded bus 14 of the power source of the entire device.

The KC-circuit of each cell contains a capacitor 15, a resistor 16, transistors 17-20, resistors 21-23, a closing contact 24 of the blocking relay, resistors 25- (25-n).

The device works as follows, at once.

Claims (2)

When pressing button 9 or switching on the contact 8 of external automatic start, the common plus bus with eg -. AFC is connected to the bus 12, in this case the locking relay 5 is activated and by its closing contact b blocks the power supply circuit, which is further independent of the state of the contact 8 and the button 9. At the same time, the switching contact 24 changes its state. breaking a bypass circuit, the time of the master capacitor of the first time of the master cell 1-1 and the connection of the latter to the positive voltage bus 12 of the stabilized voltage, after which the first time of the master cell 1-1 begins to calculate the time interval & t The master cells 1-1, are not yet connected to the power bus 12 and therefore do not consume electric power, but the time the master capacitors are bridged in them, which leads to the removal of possibly accumulated residual voltages, since a full discharging them and preparing for work. Further, at the time of testing by the cell 1-1 of the interval & t, its output relay 2-1 is triggered, which leads to a similar process: the shunt is removed from the time of the driving capacitor of the next cell 1-2, then connected to the cell 1-2 The bus 12 and the master cell time. 1-2 is connected to the stabilized voltage source, while all the remaining cells are still not connected to the power source and their timing of the drive capacitors has been disconnected. After working out the time interval utg, the process of connecting the subsequent time of cell dimming and working out the time intervals At ... At continues until the output relay 2-n of the last cell, 1-n, since with this pin The 7 rvet circuit of the winding of the blocking relay 5, wherein the rvet of the circuit and the bus 12 is disconnected from the power source with a voltage of + E |, which causes the power to be removed from the entire multi-phase generator and off all output relays (2-1) - (2- p), therefore all the switching contacts (4-1) -4- (p-1) and 24 change howling state, i.e. first, bus 12 is disconnected, and then the capacitors of all cells are shunted by the time, and thus the capacitors are discharged. remove residual stresses from them. At this, the cycle of working out the sequence of time intervals ends before the signal of switching on the circuits by means of pin 8 or button 9. The multiphase generator of adjustable time intervals can be operated and in automatic mode, it generates continuously a sequence of adjustable time intervals. For this purpose, RC delayed delay circuits for the relay and its contacts are used in the power interlock circuits, which will act as relay 5, and the latter is excluded from the device. Consider the work time of master cells 1-i (Fig. 1). After the completion of the process of testing the time interval A t before and the cell l- {il), its output relay 2- (il) is activated and its switching contact group 4- (il) breaks the circuit with a resistor 25-i that shunts the time setting capacitor 15 of the cell 1-i and then connects bus 12 to it with a power supply voltage, with the entire input stage and the control part of the input stage, i.e. The time of the RC circuit of the cascade-connected field-effect transistors (17-in active mode and 18-in passive mode) and the bipolar modulator transistors 19 and 20 connected via Darlington system are connected to a source of stabilized voltage throne 10, i.e., buses 12 and 13, and output relay 2-i to common power bus 14. Capacitor 15 begins to charge through resistor 16, while the voltage of the capacitor is supplied through resistor 21 to the gate of the active transistor 17 which leads to a change in the current channels of both t The rangers 17 and 18 with their common source and drain circuits are supplied through a resistor 23 to the base of transistor 20, as a result of which the current of both bases of the bipolar modulator increases and the current in their common collector circuit loaded on relay 2-i grows. When the voltage on the winding of the relay 2-i reaches the value of the tripping voltage p, the latter is triggered and its switching contact group 4-i changes its state and thereby starts the subsequent time setting the cell l- (i + l) , the time interval testing process ends and the process of testing the subsequent time interval by the next cell 1 begins. To increase the reliability of operation, the limiting resistors 25, 21 and 23, as well as the diode 3-i, turned on in the reverse-mixed direction are introduced. With the help of resistor 22, you can smoothly adjust the time-sensitive ut ut B at any time, and the control process itself does not affect the quality of the entire device as a whole, since the control does not break the emitter connection circuit of the transistor 19 with the input stage power bus those. with the drain of the transistor 17 and the capacitor plate 15.. . The object control output signals are removed from additional contact groups (not shown) of the output relays (2-1) - (2-h). Signals & control in potential form can be removed from the windings of the same relay and fed to discrete microelectronic elements. The effect of increasing the accuracy of working out 1xx time intervals and increasing the staffing efficiency in the proposed multiphase generator can be obtained by connecting the switching contacts of the output relays of the previous time of the master cells of the ramp-scaling part to the plates of the time of the capacitor of the subsequent cells j and the termination part of the positive source bus stabilized voltage, in this case, since at the moments of relay operation the switching groups of contacts always first break the circuit in the disconnecting parts and then after a short period of time they close the circuits in their lower parts, in the proposed device, in comparison with the prototype, situations never arise where the supply voltage is simultaneously applied to the master cells and the capacitors in them are shorted i.e. There are no situations when the gates of field-effect transistors are supplied with supply voltage of locking polarity with their simultaneous supply to the channels, i.e. on the drain circuit, which eliminates the occurrence of temporal drift in the output characteristics of field-effect transistors, moreover, the residual voltages are reliably relieved for the duration of the drive capacitors by the moment of opening of the shunt circuit after the output relay of the previous cell has triggered. The effect of reducing power consumption in this device is determined by the fact that the power source is connected to the time setting the cell not simultaneously, but in succession, which leads to energy savings of more than 50%. Claims of the Invention A multi-phase generator of adjustable time intervals containing a snooze driver cells made in based on an RC circuit connected to a post cascade with an output relay coil as a load, oj l and due to the fact that, in order to improve the accuracy of working out adjustable time intervals, reduce power consumption and increase reliability, the break contacts of the output relays of previous cells are connected via limiting resistors parallel to the time setting the capacitors of the subsequent cells, the closing contacts are connected between the positive bus of the stabilized power source and the input of the RC circuit, the closing contact is output on relay The last cell is connected between the winding of the Eyule interlock and the positive voltage source bus, which in turn is connected via the parallel-connected make contacts of the blocking relay, the external automatic start relay and the manual start button to the common positive power bus. Sources of information taken into account during the examination 1. USSR author's certificate No. 225327, cl. H 01 H 47/18, 28.11,66. 2. USSR author's certificate number 387514, cl. H 03 K 5 / 13,22.10.71 (prototype). W- 4СН  .i -K