SU1499255A1 - Multichannel device for monitoring d.c. voltages - Google Patents

Abstract

The invention can be used in power supply systems of electronic equipment for the tolerance control of a constant voltage. The transfer ratio of adders 9.1 ... 9 N is set so that the magnitude of their output signals is zero at nominal values of monitored voltages. Differential signals from the outputs of the adders, which characterize the deviation of the monitored voltages from the nominal values specified by the source 2 reference voltages, are displayed with voltmeters 7.1 ... 7. N, and with the help of multipliers 8.1 ... 8. N is modulated in amplitude by the output of generator 1. When the amplitude of the pulses is exceeded at the outputs of the multipliers 8.1 ... 8. N of a given threshold comparators 6.1 ... 6. N and filters 5.1 ... 5. N form the signals which are displayed on the indicator 3 through the block 4 matches. Introduction of the multipliers 8.1 ... 8. N and adders 9.1 ... 9. N allows you to generate a variable signal, the amplitude of which is proportional to the deviation of the monitored voltage from the nominal value, and to provide simultaneous control of its increase and decrease, which expands the range of use. 2 Il.

Description

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with

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The invention relates to electrical measuring equipment and is intended for use in devices for controlling DC voltages as well as in systems for remote monitoring of electronic equipment.

The purpose of the invention is to expand the field of use by providing control for both increasing and decreasing voltage.

Lig.1 shows the functional diagram of the device; FIG. 2 shows signal timing diagrams at various points in the circuit.

The multichannel device for monitoring DC voltages of FIG. 2 contains a generator 1, a source 2 of a reference voltage, an indicator 3, a block 4 of coincidence, filters 5.1 ... 5.P comparators 6.1 ... 6.n, voltmeters 7.1 .... 7.P, multipliers 8.1 ... 8.P, coolers 9.1 ... 9.n.

The output of the generator T is connected to the first inputs of multipliers 8.1 ... 8.P of all channels, the output of source 2 of the reference voltage is connected to the First inputs of adders 9.1 ... 9.P, the second inputs of which are the corresponding inputs 10.1 ... 10. П devices, and the output is with the second inputs of the multipliers 8.1 ... 8.P, not voltmeters 7.1 ... 7.P of the corresponding channels, the outputs of each of the multipliers 8.1 ... 8.n are connected to the first inputs of the comparators 6.1. .. 6.P each channel, the second outputs of which are connected to the bus voltage. The outputs of the comparators 6.1 ... 6.P through the corresponding filters 5.1 ... 5.P are connected to the corresponding inputs of the coincidence unit 4, the output of which is connected to the indicator 3.

The device works as follows.

To the terminals 0.1 ... i0.n, the controlled voltages 1 ... Un are supplied to the first inputs of the adders, 9.1 ... 9.p. At the second inputs of the summers 9.1 ... 9. and the reference voltage is applied. If different in magnitude and sign of the voltage are controlled, the value of the reference voltage II JT is rational to choose equal to the nominal value of the smallest of the controlled voltages 0

five

five

0

five

,

and the coefficient k, the transmission of the i-th adder at a controlled voltage Lb is taken to be

., t; f

I

The difference (-), formed by the adder 9.1, is fed to a voltmeter 7.1, according to the indications of which the magnitude and direction of the controlled voltage deviation is measured, and to the first input of multiplier 8.1, to the second input of which the oscillation S is applied one.

Fig. 2a shows the output signal of generator 1 in the form of rectangular oscillations. Fig. 26 shows the change in the controlled voltage of the 1st channel, taking into account the normalizing factor k ,. To simplify the idea that the voltage And, - at arbitrary moments of time t ... Z jumps to a new value. It also shows the voltage and the range of allowable variations (the dotted lines of the controlled voltage, taking into account the normalizing coefficient k, i.e., and

Fig. 2b shows the output voltage of the adder 9.1 supplied to the first input of the multiplier 8.1. Multiplier output voltage 8.1

UswjtnBpiCt) (kiU, -U3r) S (t)

(2)

It can be seen from formula (2) that, if the controlled voltage U, does not correspond to its nominal value, i.e. (- Pe) O, then the output of multiplier 8.1 will be a sequence of pulses, the amplitude of which is proportional to the deviation of the monitored voltage from the nominal value, and the phase, which is two values, O or ", depends on the sign of the deviation.

From the output of the multiplier 8.1, the signal (Fig. 2d) is fed to the first input of the comparator 6.1, to the second input of which a reference voltage is applied that specifies the range of allowable variations. The output of the comparator 6.1 is connected to the pattern 5.1. If the amplitude of the pulses at the output of the multiplier 8.1 is less than the reference voltage, then the voltage at the output of the comparator 6.1

and filter 5.1 is zero. If the amplitude of the pulses at the output of the multiplier 8.1 is greater than the reference (Ubk (i. (, Then the output of the comparator 6.1 will be a sequence of rectangular pulses, and at the output of the 5.1 filter, a constant voltage will appear (Fig.2e, d), which comes in input of block 4 coincidence. At the same time, at the outputs of block 4 of coincidence and indicator 3, signals are formed, witnessing that the monitored voltage goes beyond tolerance ..

The presence of a low voltage level at all inputs of the coincidence unit 4 indicates that the monitored voltages are within specified tolerances and at the outputs of the coincidence unit 4, and the indicator 3 generates a corresponding signal.

Claims (1)

Invention Formula A multichannel DC voltage monitor, containing a reference voltage source 0 five 0 five No, a generator and n channels, each of which contains a comparator, a filter and a voltmatr, the filter outputs of all channels are connected to the corresponding inputs of a matching unit, the output of which is connected to the indicator input, the filter inputs in each channel are connected to the outputs of the corresponding comparators, characterized in that , in order to expand the scope of use, an adder and a pen, an multiplier, the output of which is connected to the first input of the comparator of the corresponding channel, the second input of which is connected to the bus voltage, the first inputs of the adders of all channels are combined and connected to the output of the reference voltage source, the second inputs of the adders of each channel are connected to the corresponding inputs of the device, and the outputs are connected to the corresponding voltmeters and first inputs of the multipliers of the corresponding channels, the second inputs of which are combined and connected to the output of the generator.