SU1597753A1 - Apparatus for remote control of voltage - Google Patents

Abstract

The invention relates to electrical measuring equipment, and is intended for controlling the voltage of remote power sources, for example, for centrally controlling the power supply voltage of various computer racks. In order to expand the functionality by fixing a link breakage regardless of overvoltages in the monitored power source, resistors 3, 5, Zener diode 2 and additional voltage source 12 are inserted in the device, and the dual-frequency generator 14 is controlled. If the monitored voltage at the input terminal 1 is less than the lower limit, the comparators 6-8 are in the zero state and the generator 14 generates a low-frequency signal that through the open IS-NOT element 16 goes to the indicator light 17. If the monitored voltage is within tolerances, the comparator 8 is triggered and through the element AND-NOT 15 closes the element AND-NOT 16, the light indicator 17 does not light up. If the voltage at terminal 1 exceeds the upper limit, the comparator 7 is triggered, the generator 14 generates a high-frequency signal, and the AND-HE element 16 opens. If the line 4 is broken, the source 12, through the resistor 5, causes the comparator 6 to operate, which through the inverter 13 and the generator 14 causes the indicator 17 to be lit continuously. The thresholds are set by voltage reference sources 9-11. If overvoltage occurs at terminal 1, the resistor 3 and the zener diode 2 do not allow the comparator 6 to operate, i.e. exclude false information about the break of the communication line 4. 1 Il.

Description

The invention relates to an electronic measuring instrument, which is intended for monitoring the voltage of remote power sources, for example, for centralized monitoring of the supply voltages of various racks of computers.

The purpose of the invention is to enhance the functionality by ensuring that the JQ link is broken, regardless of overvoltage in a controlled power source.

The drawing shows a diagram of the device.

The remote voltage control device contains an input terminal 1 for connecting a monitored power source, the first output of Zener diode 2 is grounded, the input terminal 1 is connected via a resistor 3 to the second output of Zener diode 2, which is connected to the first terminals of the resistor 5 and comparator 6 -eight,. the second outputs of which are connected to the outputs of the sources 9-11 of the reference voltage, respectively, the second switch of the resistor 5 is connected to the output of an additional source of 12 n, aJIp of the wife, the output of the comparator 6, the HE element 13 is connected to the input of a controlled two-frequency generator 14, the control input of which is connected to the output of the comparator 7 and the inverse input of the AND-15 element, the direct input of which is connected to the output of the comparator 8, the output of the AND-15 element is connected to one of the inputs of the AND-16 element, the other input of which connected to the control output th dual frequency oscillator 14, an output of AND-NO element 16 is connected with the indicator light 17. A second input terminal 18 for connecting the controlled power supply is grounded.

A Zener diode 2 is connected to a controlled power source in accordance with the polarity of the latter. With the polarity of stabilitron 2 shown in the drawing, the polarity of the additional voltage source 12 must be positive. As the light indicator 17, you can use the LED.

The remote voltage control device operates as follows.

If the magnitude of the monitored voltage at terminal 1 is less than

5 Q

-

0

the voltage of the reference voltage of the source 11 of the reference voltage, then at the outputs of the comparators 6–8, logical zeroes, and the control two-frequency,. oscillator 14 generates low-frequency oscillations that pass through the element AND-HE 16, since the logical unit is present at the output of the element IS-NOT 15. By slow oscillations, the indicator light 17 indicates that the monitored voltage of the power source is below the permissible limit.

If the controlled voltage is higher than the reference voltage of the source 11 of the reference voltage, but lower than the reference voltage of the source, then a logical unit is set at the output of the comparator 8, which closes the AND-NE element 15, a logical zero is set at its output the indicator light 17 goes out as the NAND element is locked. This is a normal mode of operation.

If the voltage of the power source at terminal 1 exceeds the upper permissible limit (the magnitude of the reference voltage of source 10), then the comparators 7 and 8 at the outputs have a logical unit, the element AND NOT 16 is open, and the controlled two-frequency generator 14 produces an alternating voltage drawn frequency, which is converted by the light indicator 17 to light all-peaks, signaling about the controlled voltage.

When the link 4 is broken, the comparator 6 is triggered, the dual-frequency control generator 14 produces a constant voltage at its output and the indicator light 17 is lit continuously. To provide such a mode, the voltage stabilizing Zener diode 2 must be higher than the upper allowable limit of variation of the monitored voltage and lower than the magnitude of the reference voltage of source 9, the magnitude of which, in turn, must be lower than the magnitude of the voltage of source 12. If resistor 5 by an order of magnitude or more exceeds the resistance value of resistor 3, the latter does not affect the results of monitoring the source voltage if the link 4 does not have a break. In the case of overvoltage on clamp 1, the

the batting of the Zener diode 2 will eliminate the occurrence of false information indicating that the link 4 link is broken.

Claims (1)

Invention Formula A remote voltage control device containing a comparator unit with the combined first inputs, the output of the first comparator is connected to the input of the NOT element, the outputs of the second and third comparators are connected to the inverse and direct inputs of the first element. AND-NOT, respectively, the outputs of the controlled generator and the first element AND-NOT are connected respectively to the inputs of the second element | AND-NOT, the output of which is connected to the OBOBM indicator, the second inputs of the three comparators are connected to the outputs of the three sources of the reference voltage, respectively characterized by the fact that, in order to expand ; 20 Ij. . functionality introduced an additional voltage source, two resistors and a zener diode, the first input terminal of devices for connecting a monitored power source and the first output of a zener diode combined and connected to a common cable, the second input terminal of a device for connecting a monitored power source through a first resistor connected. with the second output of the Zener diode, which, in turn, is connected via a communication line with the first output of the second resistor and the first input of the first comparator, second oh vshod second resistor connected to the output of the additional voltage source controlled by the generator is two, the frequency and its control input / connected to the output of the second comparator.