SU1310641A1 - Device for checking power supply system of digital computer - Google Patents

Abstract

The invention relates to the field of computing and can be used to control digital computer devices in emergency situations in the power supply system. The aim of the invention is to increase the noise immunity of the power supply system of a digital computer. The goal is achieved in that the device containing the start and emergency stop threshold elements 4 and 5, the integrator 8, the start and emergency stop signal generators 6 and 7, a controlled time counter 9, a comparator 15, a shutdown voltage setting device 17 and an element And 16. 2 ill. S (L L.f ± SlU L4dj m a dj 1 J. J-t I and I I I I.I I ... and fuf.t

Description

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The invention relates to computing and can be used to control a digital computer in emergency situations in a power supply system.

The aim of the invention is to improve the noise immunity of the power system of a digital computer.

FIG. 1 shows a functional diagram of the device; Ia figure 2 - a temporary chart of his work.

The device (Fig. 1) contains sources 1,2 and 3 of the power supply, the voltage at the inputs of which is controlled by the device containing the threshold element 4 after the emergency start, the threshold element 5 of the emergency stop, the driver 6 of the start signals, the driver 7 of the emergency stop signals , integrator 8, controlled time counter 9, input 10 of monitored supply voltage, input 11 of the command to be controlled, output 12 of the emergency start, emergency stop output 13, emergency shutdown output 14, comparator 15, element 16 and setpoint 17 nor shut off. In addition, the device contains comparators 18–20, operational amplifier 21, Schmitt triggers 22–24, zener diodes 25–27, current-measuring resistors 28–35, field-effect transistor 36, and a storage capacitor.

The proposed device works as follows.

With an increase in mains voltage caused by switching on or restoring its level after a dip, the delay time of the power sources at their outputs is set to the rated voltages. The integrator 8, connected to the mains, has a time constant that is obviously longer than the rise time of the voltage to the nominal one in the power sources. The voltage from the output of the integrator B is fed to the input of the threshold element 4. If the average value of the mains voltage is at a predetermined threshold, then the output of the threshold element 4 is a signal that through the driver 6 is output to output 12 to start the digital computer.

When the mains voltage decreases by 15%, a signal appears at the output of the threshold element 5, which through the driver 7 enters the input

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element 16. The comparator 15 is supplied with a disconnect voltage from the setpoint generator 17 and the voltage from the power sources.

When the voltage fails, the signal to disconnect the digital computer from the comparator 15 to the other input of the element 16 comes later than from the driver 7 due to the use of the capacitance energy of the filter capacitor of the digital computer power supply unit accumulated at voltages above 0.15. If during this time the network is reset, then the shutdown of the digital computer does not occur.

If shutdown is necessary,

the comparator 15 outputs a signal to the second input of the AND element 16, which, when there is a signal at the first input, outputs a signal to the output 13 to stop the digital computer,

and also resets the integrator 8 and blocks the operation of the counter 9 control. This signal, with sufficiently long voltage dips, blocks the automatic start. After this signal disappears, an automatic start can occur after a time determined by the delay time of the integrator 8.

When the Bbmie supply voltage increases the threshold value, the driver 7 issues a signal to the emergency shutdown output of the digital computer from the mains 14, after which a signal appears on the emergency power supply, through which the digital computer processes

storage program.

The level of the monitored voltage of the network is represented by the time diagram (Fig. 2) of plot a, where the points in time of voltage change are marked,

exceeding the tolerances, for example 15%. On output capacitance filters of sources 1,2 and 3, the voltage varies according to the plot diagram b. It also shows the reference

the voltage of the comparator 15, when it drops below the level of which the latter operates (plot c).

The signal from the output of the comparator 15 is supplied to the element I 16. Together with the stop signal produced by the emergency stop threshold element 5 with monitored mains voltage and generated by the trigger 22. The stop signal produced by the device (plot e) is much less common than the stop signal (plot d), as in the known device, due to the use of energy stored in the filter

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| Pax sources 1-3 nutrition. The use of: two channels of forming a stop signal increases the reliability of the device,

When the mains voltage exceeds the maximum allowable value in the threshold element 5, the comparator 19 is triggered and, via trigger 23, gives a signal to the emergency shutdown (epuGL n1g

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Upon receiving the emergency stop signal, the post-emergency start signal is blocked by applying a signal to the base of transistor 36 of the integrator 8. After the emergency stop signal disappears, the comparator 20 is triggered in the threshold element 4 and the driver 6, made on the Schmitt trigger 24, has permission for the post-emergency start of diagrams and .

In the known device, threshold elements operating from the primary network give an emergency stop signal after a fixed time interval l T, determined by the element speed (point e in Fig. 1). At the same time, the energy of the filter capacitors in the power supply is still sufficient for the operation of a digital computer. Only with relatively long network failures (the time interval between tg and t in Fig. 2) does the voltage at point b fall below the allowable reference voltage of the comparator 15, and then transfer to the memory storage subroutine of the digital computer whose execution time is i Tg .

The emergency stop signal is released into the known device through time () after the network voltage is reduced to the value of 0.35 Itz s in the suggested one after (RT + ST2).

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Claims (1)

Invention Formula A device for monitoring a power system of a digital computer (DVR) containing a controlled time counter, the counting input of which is the control input of the device for connecting the output of the DVR command, and the output connected to the first input of the starting signal generator, whose output is the output of the device for connecting the post-emergency start of the digital computer, and the second input is connected through the threshold element of the post-emergency start to the integrator output, the information input connected to the input voltage power supply device and an input threshold element emergency stop, the output of which is connected to the input of the emergency stop signals pervsh output of which is the output of the device for connecting the first input emergency shutdown Digital computer, characterized in that, in order to improve the noise immunity of the operation of the digital computer power supply system, a switch-off voltage adjuster, comparator and element And, the first input of the comparator is connected to the output of the shut-off voltage setting device, and the second input is the input of the device for connecting the monitored secondary the voltage of the corresponding power source, the second output of the emergency stop signal drivers and the output of the comparator are connected respectively to the first and second inputs And element, the output of which is connected to the reset input of the integrator, the prohibition input of the controlled time counter, and is the output of the device for connecting the second emergency stop output of the digital computer.