RU2500034C1 - Device to monitor contact sensor - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: device to monitor a contact sensor comprises two control channels, each comprising an electronic switch, a regulator and a registrator of current, the first and second electronic switches, a line of communication with a controlled sensor, power supply buses and a device outlet. At the same time the electronic switch, the regulator and the registrator of current, the first and second electronic switches are shunted by double-sided voltage reference diodes.

EFFECT: increased functional reliability and expansion of functional capabilities of a device due to realisation of control over contact sensor condition with current, automatic control of device serviceability, introduction of a reserve control channel in case of one possible fault occurrence.

1 dwg

Description

The invention relates to techniques for signaling and can be used in systems for monitoring the status of contact sensors.

A device for monitoring a contact sensor (RF patent No. 2289163, G08B 13/08, G08B 13/12 from 06/27/2005), containing an electromagnetic relay, first and second diodes, first and second resistors, a switch, a switch, a communication line with controlled contact sensor, power bus, make contact electromagnetic relay and device outputs.

The known device has the following disadvantages:

a) low functional reliability, due to the fact that the state of the contact sensor is controlled by voltage;

b) the inability to maintain operability in the presence of one possible malfunction (channel redundancy);

c) the lack of the ability to verify the integrity of the circuit of one channel while the other is working;

d) the lack of the ability to automatically control performance. A device for monitoring a contact sensor (RF patent No. 2419160, G08B 13/08 of 11/23/2009), selected as a prototype, contains an electronic relay, first and second diodes, first and second resistors, first and second switches, an electronic key , a communication line with a controlled contact sensor, power bus, device output, the first and second inputs of the device.

The known device has similar disadvantages characteristic of the first device.

The invention is aimed at improving functional reliability and expanding the functionality of the device.

To achieve the technical result, the device for monitoring the contact sensor containing the first make contact, the first wire line with a break for connecting the make contact of the sensor, plus and minus power buses of the first channel, and the first electronic key are additionally introduced:

1) a second make contact, the first output of which is connected to the second output of the first make contact, and the second output to the negative bus of the power supply of the first channel, the first regulator and the first current recorder, and the input of the first current regulator is connected to the output of the first electronic switch, the input of which is connected with a positive power bus of the first channel, and the output of the first current regulator is connected to the input of the first current recorder, the first output of which is connected to the first output of the first make contact, and the second output is the first the output of the device for monitoring the contact sensor, while the first and second make contacts, the first electronic switch, the first current regulator and the first current recorder are shunted by two-sided zener diodes;

2) a second channel containing a positive power supply bus of the second channel, which, through a second electronic switch, a second current regulator, a second current recorder, a second wire communication line with a break for connecting the NC contact of the said sensor, is connected to the negative power bus of the second channel, the output of the second electronic the key is connected to the input of the second current regulator, and the output of the second current regulator is the input of the second current recorder, the first output of which is the second output of the device for monitoring contact sensor, and its second output is connected to the second wired communication line and the first output of the third make contact, the second output of which is connected to the first output of the fourth make contact, and the second output of the fourth make contact is connected to the negative power bus of the second channel, while the second electronic key , the second current regulator, the second current recorder, the third and fourth make contacts are shunted by bilateral zener diodes.

In FIG. shows a block diagram of a device for monitoring a contact sensor.

In FIG. shown:

1 - the first channel;

2 - the second channel;

3 - controlled contact sensor.

Channel 1 shows:

4 - positive power bus of the first channel;

5 - the first output of the device for monitoring the contact sensor;

6 - negative power bus of the first channel;

7 - the first zener diode;

8 - the first electronic key;

9 - the first current regulator;

10 - the first current recorder;

11 - the second two-sided zener diode;

12, 13 - the first and second electronic switches;

14, 15 - the third and fourth bilateral zener diodes;

16 - the first communication line.

Channel 2 shows:

17 - the second communication line;

18, 19 - the fifth and sixth two-sided zener diodes;

20, 21 - the third and fourth electronic switches;

22 - second current recorder;

23 - the second current regulator;

24 - seventh two-sided zener diode;

25 - second electronic key;

26 - eighth zener diode;

27 - positive power bus of the second channel;

28 - the second output of the device for monitoring the contact sensor;

29 - negative power bus of the second channel.

The functioning of the device for monitoring the contact sensor is as follows.

Consider the operation of the first channel 1, since the functioning of the second channel 2 is similar to the first 1.

The first 8 and second 25 electronic keys, the first 12, second 13, third 20 and fourth 21 electronic switches are controlled by a controller (not shown in the figure) according to a predetermined algorithm.

In the main operation mode of the first channel 1, from the positive power bus 4 of the first channel to the negative power bus 6 of the first channel through a closed first electronic switch 8, a first current regulator 9, a first current recorder 10, a first communication line 16, a closed contact sensor 3, current flows the parameters of which are determined by the elements of the first current regulator 9. The advantage of using the first 9 and second 23 current regulators in the claimed invention in comparison with the voltage source is that they allow you to have undefined parameters of the circuit stroke sensor 3.

When the contact sensor 3, i.e. when its contact opens (closes), this circuit breaks (closes), and the current flow through it stops (resumes). As a result, the first current recorder 10 gives a signal about the operation of the contact sensor 3 to the first output 5 of the device for monitoring the contact sensor.

The operability of the first channel 1 of the device is diagnosed by checks.

1. The opening of the contact of the first electronic key 8 when the contact sensor 3 is closed should be accompanied by a change in the signal of the first current recorder 10, which is monitored at the first output 5 of the device for monitoring the contact sensor.

2. Closing the contacts of the first 12 and second 13 electronic switches when the contact sensor 3 is open and the first electronic key 8 is closed should provide a closed circuit and, accordingly, a change in the signal of the first current recorder 10, which is monitored at the first output 5 of the device for monitoring the contact sensor. Subsequent opening of the first 12 or second 13 electronic switch simulates the opening of the contact sensor 3, as a result, the signal generated by the first current recorder 10 at the first output 5 of the device should change.

In the event of detection of incorrect operation of the first channel 1, control over the state of the contact sensor 3 is transferred to the second channel 2.

In the claimed invention, it is possible to verify the integrity of the circuit of one channel while the other is working.

To control the integrity of the circuit of the second channel 2 during the simultaneous operation of the first channel 1 (closed contacts of the first electronic key 8 and sensor 3, open contacts of the first 12 and second 13 electronic switches), it is necessary to close the second electronic key 25, the third 20 and fourth 21 electronic switches. Thus, from the positive bus of the second channel 27 through the closed contact of the second electronic key 25, the second current regulator 23, the second current recorder 22, the closed contacts of the third 20 and fourth 21 electronic switches to the negative bus of the second channel 29 will flow current, the parameters of which are determined by the indicators the second current regulator 23. And the second current recorder will give a signal about the state (integrity) of the specified circuit to the second output 28 of the device for monitoring the contact sensor.

To protect against overvoltage during opening, the first 8 and second 25 electronic switches, the first 12, second 13, third 20 and fourth 21 electronic switches are bridged by the first 7 and eighth 26, third 14, fourth 15, fifth 18 and sixth 19 two-sided zener diodes, respectively.

Claims (1)

A device for monitoring a contact sensor containing a first make contact, a first wired communication line with a gap for connecting a break contact of said sensor, plus and minus power buses of the first channel and a first electronic key, characterized in that a second make contact is additionally introduced into the device, a first output which is connected to the second terminal of the first make contact, and the second terminal to the negative power bus of the first channel, the first controller and the first current recorder, and the input of the first of the current regulator is connected to the output of the first electronic switch, the input of which is connected to the positive power bus of the first channel, and the output of the first current regulator is connected to the input of the first current recorder, the first output of which is connected to the first output of the first make contact, and the second output is the first output of the device for monitoring the contact sensor, while the first and second make contacts, the first electronic switch, the first current regulator and the first current recorder are shunted by two-sided zener diodes, the second the first channel containing the positive power supply bus of the second channel, which through the second electronic switch, the second current regulator, the second current recorder, the second wire communication line with a break for connecting the NC contact of the sensor is connected to the negative power bus of the second channel, and the output of the second electronic key is connected with the input of the second current regulator, and the output of the second current regulator is the input of the second current recorder, the first output of which is the second output of the device for monitoring contact dates Ika, and its second output is connected to the second wire line of communication and the first output of the third make contact, the second output of which is connected to the first output of the fourth make contact, and the second output of the fourth make contact is connected to the negative power bus of the second channel, while the second electronic key, the second current regulator, the second current recorder, the third and fourth make contacts are shunted by bilateral zener diodes.