SU1649624A1 - Device for controlling three groups of secondary power supplies - Google Patents

Abstract

The invention relates to electrical engineering and can be used in the secondary power supply systems of automatic telephone exchanges with a recorded program. The purpose of the invention is to increase reliability. The device contains sources of secondary power supply 1-8 with built-in protection circuits, three voltage level control units 9-11 consisting of a series-connected delay element 12 and a voltage level generator 13, and three formi S

Description

The invention relates to electrical engineering and can be used; secondary power supply systems, {(SHE) automatic telephone exchanges (PBX) with a recorded program.

The purpose of the invention is to increase reliability,

FIG. 1 is a diagram of a device for controlling three groups of secondary power sources; FIG. 2 is the same as the exemplary embodiment.

The device (Fig. 1) contains sources 1-8 of secondary power supply (IHE) with built-in protection circuits (overcurrent and short circuit) with IWE protection off and with leads for distanion switching on and off. They are connected to the output of a guaranteed power supply device for automatic telephone exchanges (not shown), which is the reference source of SHA with a voltage U. The SVZ contains three knots 9-11 of the voltage level Uo, consisting of the series-connected delay element 12 and the level generator 13. The inputs of the nodes 9-1I control are connected to the device for isolation. The SHE also contains three formers of 14–16 pulses of remote activation of IHE, the element I 17 e, the self-oscillating multivibrator 18, the trigger 19, the W-NE 20 element, the control switch 21 and the HE element 22.

The output of the first control unit 9 is connected to the first input of an OR-NOT 20 element, the second input of which is connected to the output of a device (not shown) of the synchronization of the processors of control devices 23 of the exchange (for example, two electronic control machines 23-0 and 23-1 operating in synchronous mode with mutual control and without load sharing). You-1 move element OR-NOT 20 is connected to the inputs for remote twisting of IHE 7 and 8 of device 24

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input of programs into the memory of control devices 23 and IHE 3-6 control devices 23. The output of the second control unit 10 is connected through the element HE 22 to the inputs for remote shutdown of the power supply sources 1 and 2 of the switching equipment 25 PBX. The output of the third control node 11 is connected to the first input element AND 17, up-1 equating the input of the key 21 and the trigger 19. The common power supply circuit through the serially connected output pins of the key 21 and the button 26 is connected to the second input of the trigger 19, the inverse output of which is connected to the second start input of the multivibrator 18, the output of which is connected to the input of the first pulse shaper 14, connected by one output to the inputs for remotely switching on sources 3-6 of the control devices 23 of the exchange, and the second to the second shaper input 15 pulses. The second pulse shaper 15 is connected by one output to the inputs for remotely turning on sources 7 and 8, the program input device 24, and the second to the input of the third pulse shaper 16, the output of which is connected to the inputs for remotely turning on sources 1 and 2 of the switching equipment of the exchange, which includes general case switching field, station and linear sets, registers (not shown).

Controlled keys 27 and 28 are additionally introduced into the device shown in Fig. 2-, the control inputs of which are connected to the outputs of the control devices 23. The output pins of the key 27 are connected to the pins of the button, and the key 28 to the second output of the trigger and a common power supply circuit.

The device works as follows.

IBE 1 and 2 provide power for a given voltage rating

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equipment of switching equipment 25 ATE, IVA 3, 4 and 5 ,. 6 - accordingly, the zero 23-0 and first 23-1 electronic control machines of the peripheral control devices forming the ATC control device 23 and IHE 7 and 8 are the devices 24 for automatically entering programs into the program memory of the control devices 23.

The control devices 9-11 are controlled to the required voltage levels U0: the third device 11 to the nominal value (for example, 60 V), the first device 9 to the minimum (for example, 50 V), which provides a stable output voltage of the ICE, and the second device 10 is at an intermediate level (for example, 54 V), at which the output voltage of IHE is stabilized and the normal operation of all those devices (for example, sets, control generators, VCAs) of switching equipment of automatic telephone exchanges that are powered directly but from the reference source of the SHE voltage U0. Therefore, in the case of a decrease on the inverse output of the shaper 13 of the level of the third node 11 of the control, the high

cue potential, and at the output of the element And 17 a low potential is formed, which is fed to the control input of the multivibrator 18, and the self-oscillation of the latter interrupts. At the first outputs of the shaper 14-16 trigger pulses, the formation of remote switching pulses is stopped.

Thus, when the value of voltage U is lower than the level control set for node 11, the remote activation of IWE 1-8 is not carried out. The restoration of the work of IRE after the operation of the protection and the protective shutdown of IRE is carried out by the staff completely. When the voltage U0 is further lowered below the intermediate level specified for the control unit 10, a low potential is formed at its output and a high potential at the output of the HE element 22, which is fed to the inputs for remote shutdown of IWE 1 and 2 switching equipment 25. As this level is the minimum allowable for the normal operation of a row of dies of the switching equipment 25, pa0

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The bot stops it by turning off the IVE 1 and 2.

In general, the number of IHE in the PBX is different and depends on the numbering capacity of the composition of the PBX equipment of a particular project. With a further decrease in the voltage below the level specified for the control unit 9, which does not ensure the stability of the output voltage, the output potential of the control unit 9 forms a low potential, and the output of the OR-NOT element 20 generates a high potential that goes to the remote control inputs turning off the IVE 3-6 control device 23 and IVA 7-8 device 24 automatic input programs. When the stability of the output voltage of an IHE is disturbed, the normal operation of the control devices 23 and the input device 24 becomes impossible, since all the equipment of these devices is powered by IHE. Therefore, further

5, maintaining the readiness of the control devices 23 and the input device 24 becomes impossible and the latter are turned off by turning off the IVE 3-8. Rebuild nurl marriage

0 UQ leads to the loss of high potential at the outputs of the elements OR NOT 20 and NOT 22, i.e. Removing the remote shutdown signal of all IVA 1-8. Formation and withdrawal process

5 of this signal is carried out due to delay elements 12, which delay the time with respect to and, which ensures the stability of the control mode

0 short-term voltage drops (rises) or in transient conditions. When the voltage reaches its nominal value, a high potential is formed at the output of the control unit 11.

5 and element 17, the multivibrator 18 enters the self-oscillation mode and at the outputs of the formers 14–16 pulses, pulses are successively formed, and from the first outputs they are fed to the inputs for the distortion switch of IHE 1–8.

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The successive formation of these pulses in time ensures the preset sequence of switching on: IHE 3-6 control devices 23; IVA 7-8 automatic program entry device; IWE 1-2 switching equipment.

This sequence is determined by the sequence of switching on 1 and the initial start of the automatic telephone exchange, and the time shift of the output pulses at the output of the first 14, second 15 and third 16 drivers - the readiness of the equipment of the automatic telephone exchange and the duration of the initial start of the system.

In this case, a high potential is present at the control input of the switch 21, and the output circuit of the switch 2f is in the on state. When the button 26 is pressed, a low potential is formed at the second input of the trigger 20 and the trigger 20 switches, a high potential is formed at its output, and a low potential at the output of the element AND 17, which leads to the cessation of self-oscillations of the multivibrator 18 and the generation of remote switching pulses. Thereby, multiple launches that are turned on under the protection of IHE are stopped, which helps prevent the spread (for example, due to an unsteady power supply mode) of failures in consumers adjacent to the failed one.

Thus, when the BLE protection and IRE protective shutdown are triggered after eliminating the failed equipment (cell, etc.), the next remote switching impulse will trigger the switching off of the IED and the PBX equipment will be restored completely. This will occur automatically for the remaining malfunctioning part of the equipment in the event of self-removal of the overload (short-circuit).

When the output voltage of the inverter is lowered due to a failure in the powered equipment that triggers the overvoltage of the overvoltage protection and the safety shutdown of this power consumption, the remote activation pulses in the system shown in Fig. 1 cause periodic switching off and protection switching off. Since the delay of the protective shutdown can be commensurate with the thermal time constant of the electro-radioelements of the equipment, the cyclic switching on and off of their power supply stimulates the aging of the radio-electronic elements, which reduces the reliability of the equipment. To eliminate

This flaw in the circuit that is rocked in Fig. 2, the scanning system (not shown) gives information about the shutdown. nii this IVE. Then, in the control devices 23, a time is counted, which limits the number of remote activation pulses arriving at IRE, after which the control

the device 23 generates commands and the corresponding output signal, which is supplied to the key 27, causes the trigger 19 to switch and the self-oscillations of the multivibrator 18 to stop.

5 Formation of pulses for remote shutdown of the power consumption is stopped.

The multivibrator 18 is turned on by setting the trigger 19 to its initial state by supplying and controlling a device 23 of the appropriate signal to the control switch 28, through which a low potential arrives at the first input of the trigger 19. The command to execute this operation the control devices 23 They can generate both according to the directive of the operator, and automatically upon receipt of a steady-state signal about the restoration of IHE of the failed part to the RY PBX device.

Claims (2)

1. A device for managing trap groups of sources of secondary power supplies having inputs for connecting to the DC power supply network, a remote shutdown input and a remote switching input, the load of which is, respectively, switching equipment, control devices and devices for automatic program input of automatic telephone stations 5 Diy (PBX) with software control unit containing a network voltage level control unit, made in the form of a series-connected delay element and a shaper level generator, connected to the network lektropitani, pulse shaper incorporation remote sources AND gate and key, characterized in that, in order to increase reliability, the device has two control units, a trigger, elements OR-NOT and NOT, a control key with two inputs and a multivibrator, with the inputs of the control units connected to the network power supply, the output of the first control unit is connected to the first input of the element OR NOT, a. the second input of the element OR NOT is the sync output of control devices of the PBX, the output of the element OR is NOT connected to the remote shutdown inputs of the second and third groups of sources, the output of the second control node is connected through the element NOT to the remote shutdown inputs of the first group of sources, output The third control unit is connected to the first inputs of the And element, the trigger and the control key, the second trigger input is connected to the output of the control key, the second input of the control key is connected via a key to the common power network Tani, an output of AND-NO - a second input of the flip-flop, an inverse output of which is connected to the second input of the AND gate, whose output is connected to an input trigger the multivibrator, the multivibrator output - to an input of the first pulse genera- tors, one output o five five 0 intended for connection with the inputs of the remote switch-on of the second group of sources, and the other with the input of the second pulse shaper, one output of which is intended for connection with the inputs of the remote switch-on of the third group of sources, and the other with the input of the third pulse shaper, the output connected to the remote switch inputs of the first groups of sources. 2. An apparatus according to claim 1, characterized in that, in order to increase reliability by eliminating the cyclic power-up mode, a second and third controllable keys are added, the control inputs of which are connected to the output of the control devices of the exchange. the outputs of the second switch are connected to the outputs of the first switch, and the outputs of the third switch are connected between the second output of the trigger and the common power supply circuit.