SU1550618A1 - Majority-redundant device - Google Patents

Abstract

The invention relates to automation and telemechanics, in particular to redundant discrete load control devices. The purpose of the invention is to increase reliability by providing bipolar switching of load terminals. The device contains keys 1 - 3, power supply 4, windings of relays 5, 6, closing contacts of relays 7, 8, isolation elements / diodes / 9, 10, load 11, and inputs 12, 13, 14, control keys 1 - 3 In relation to inputs 12, 13, 14, the "2 out of 3" majority logic is implemented. When a control input is applied to these inputs, the power supply 4 is connected to the load 11. Removing the input signal provides a bipolar disconnection of the load 11. The load 11 is connected to the source 4 when one of the circuit elements of the device fails. Failures can be of two types - short circuit and open circuit. In case of a false circuit / on / one of the elements, the load remains de-energized by operable elements until the input control actions on inputs 12, 13, 14. The device remains operable if one of the potentials of the power source hits the corresponding load / plus terminal - positive or minus - on the minus. Thus, the device maintains operability with all single failures. 1 il.

Description

WITH

The invention relates to automation and telemechanics, in particular to redundant discrete load control devices, and can be used to ensure reliable connection and disconnection of electrical commands.

The purpose of the invention is to increase reliability by bipolar switching of load terminals.

The drawing shows a schematic diagram of the proposed device.

In the drawing, the following designations are accepted: keys 1-3, power supply 4, about-, coils 5 and 6 relays, closing contacts 7 and 8 relays, separation elements 9 and 10, load element (load) 11, inputs 12-14.

Dividing diodes are used as dividing elements 9 and 10. In the drawing, the polarity of the source and the direction of the inclusion of the diodes are shown conventionally. When changing the polarity of the source, it is necessary to change the direction of switching the diodes accordingly without changing the rest of the circuit configuration. Device inputs can be used both individually and in combination. Switches with mechanical control, for example limit switches, as well as electrical control, such as relays, reed switches or contactless keys, can be used as switches 1-3. Therefore, the diagram shows only the contact of these elements, and the dotted line indicates the application of the control action (general or individual from separate control channels). When using inputs separately, i.e. when controlling from separate channels, the majority of 2 out of 3 logic is implemented.

The device works as follows.

In the initial state, the keys 1-3 are open, the relays 5 and 6 are de-energized, their corresponding contacts 7 and 8 are open, the load element 11 is disconnected from the source 4 on both sides. Upon the occurrence of the input action and the closure of all three keys 1-3, relays 5 and 6 are triggered, contacts 7 and 8 are closed. The load element 11 is connected by its leads to the two poles of the power source 4.

The load element 11 is connected to the source 4 in case of failure of any one of the keys 1-3, relays 5 and 6 and

their contacts 7 and 8, the separating elements (diodes) 9 and 10. Failures can be of two types - open circuit, or a false circuit (inclusion). In the latter case, the source is turned off

4 from the load element 11 (in the absence of an input action) is produced by the remaining operable circuit elements.

Dividing elements (diodes)

5 9 and 10 provide an exception for the device to operate when the keys 1 and 2 are falsely closed. For example, in the absence of diodes and key 1, the relay 5 would work,

0 and together with it the relay 6, which would lead to incorrect switching on of load element 11. Diodes prevent the simultaneous actuation of the relay in this case.

5 The device maintains operability in case of accidental hit of one of the potentials of the power source to the corresponding output of the load element (plus to positive, or negative to negative).

Thus, the circuit is protected from any single element failure, as well as from the false potential hit on one of the load element terminals, which increases the reliability

5 devices.

Claims (1)

Invention Formula A major backup device containing two relays, two separation elements, a load element, a power source and three keys, the first two of which are connected to the first terminals of the corresponding relay windings, the second terminals of which are connected to the first output of the power source. connected by the second output to the information inputs of the first and second keys, which is Q and Q, so that, in order to increase the reliability of the device by providing bipolar switching of the load terminals, the first output of the load The element is connected to the first terminals of the separating elements, the second output of the load element - to the first output of the closing contact of one relay connected by the second output to the first 0 515506186 the output of the closing contact is different to the first output of the power source, the relay, the second output of which is connected to the outputs of the first and second keys, is soenen with the first output of the source of the pi-dinene and the second outputs of the corresponding information, the information input of the third-division separating elements, and the key is connected to the second output, the control inputs of all the keys in the load element, and the output is the device inputs.