CN201315470Y

CN201315470Y - Module for either-or signal output in direct current power transmission system

Info

Publication number: CN201315470Y
Application number: CNU2008201497276U
Authority: CN
Inventors: 李延龙; 黎小林; 赵曼勇
Original assignee: XJ Electric Co Ltd; Power Grid Technology Research Center of China Southern Power Grid Co Ltd
Current assignee: China South Power Grid International Co ltd; XJ Electric Co Ltd
Priority date: 2008-10-15
Filing date: 2008-10-15
Publication date: 2009-09-23
Anticipated expiration: 2018-10-15

Abstract

The utility model relates to a module for either-or signal output in a direct current power transmission system, which comprises at least three signal selection circuit units and a system effective control circuit. Each signal selection circuit unit comprises three double-input AND circuits and two double-input OR circuits; the outputs of the first and second double-input AND circuits of each signal selection circuit unit are connected with two inputs of the first OR circuit; the output of the first OR circuit is connected with one input of the third AND circuit; the other input of the AND circuit is connected with a blocking signal by a nor gate; the output of the AND circuit is connected with one input of the second OR circuit; the output of the OR circuit adopts the either-or output; and one input of each of the first and second double input AND circuits of each signal selection circuit unit is respectively connected with corresponding setting signals of two systems, while the other input is respectively connected with two outputs of a system effective control unit. The module is convenient to connect wire in the either-or logic output realized by a redundancy system, and has reliable logic output as well as strong drive and disturbance resisting capabilities.

Description

A kind of module of in DC transmission system, carrying out the output of alternative signal

Technical field

The utility model relates to the module that the output of alternative signal is carried out in a kind of direct current transportation.

Background technology

A lot of control system signals in the direct current transportation protection system all are twin-channel redundant hardware designs; and each has only the signal of a passage effective constantly; these signals mainly comprise digital quantity I/O signal; the alternative module is exactly to finish the module of the function of the signal of getting a passage in above-mentioned two passages

The utility model content

The purpose of this utility model is to carry out fast automatically the module of alternative signal output in DC transmission system.

The technical solution adopted in the utility model is: a kind of module of carrying out the output of alternative signal in DC transmission system, it is characterized in that: this module comprises at least three signal selecting circuit unit and the effective control circuit of system, each signal selecting circuit unit contains three dual input AND circuit and two dual input OR circuit, No. one of each signal selecting circuit unit, the output of No. two dual input AND circuit inserts two inputs of an OR circuit, the output of an OR circuit inserts an input of three AND gate circuit, another input of this AND circuit is connected into block signal by not gate, the output of this AND circuit is connected into an input of No. two OR circuit, the output of this OR circuit is the alternative output, No. of each signal selecting circuit unit, one of them input of No. two dual input AND circuit connects the corresponding setting signal of two systems respectively; The effective control circuit of system contains an OR circuit, two dual input AND circuit and a rest-set flip-flop circuit, two outputs of rest-set flip-flop circuit respectively with No. of each signal selecting circuit unit, another input of two AND gate circuit connects, two inputs of rest-set flip-flop circuit are connected with the output of two dual input AND circuit of system effective control circuit respectively, the input of two dual input AND circuit is connected with the effective control signal of system of two systems respectively, another input of two dual input AND circuit all is connected into the output of the OR circuit of the effective control circuit of system, and two inputs of this OR circuit are respectively applied for the effective control signal of system of two systems and are connected.

The beneficial effects of the utility model are: the alternative module is strong to the input antijamming capability of control signal, and the logic output response time is fast, and control signal output driving force is strong.

Description of drawings

Fig. 1 is the twin-channel redundant hardware block diagram in the direct current transportation protection system of the present utility model;

Fig. 2 is a hardware principle block diagram of the present utility model;

Fig. 3 is the specific implementation circuit of resistance pressure-dividing network and anti-surge protection circuit among Fig. 2;

Fig. 4 is an inner schematic diagram of the present utility model.

Embodiment

The utility model is described in more detail below in conjunction with accompanying drawing 2.

Fig. 1 is that a lot of control system signals in the direct current transportation protection system of the present utility model all are twin-channel redundant hardware designs; and each has only the signal of a passage effective constantly; these signals mainly comprise digital quantity I/O signal; the alternative module is exactly to finish the module of the function of the signal of getting a passage in above-mentioned two passages; content as shown in Fig. 1 frame of broken lines; passage effective (Active) decision by the indication of RYLJ module allows the signal of which passage export, and finishes the function of alternative.

The alternative logic function is realized that by programmable logic device software section uses the VHDL hardware description language to finish.Programmable logic device is selected the EPM3064 of ALTERA company for use.

A control input signals part is by the input of bus splicing ear, a part is imported by binding post, input signal is converted to the 5V level signal to the 24V level signal by resistor voltage divider network, is converted into the 3.3V level signal that programmable logic device needs by interface chip then; Power detection signal is input to programmable logic device after also being driven by the 3.3V interface chip, and an alternative module can realize the alternative logic switching of three groups of signals.

This modular design is the duplicate supply input, and inside adds separates even diode, and the 24V power supply is provided by the outside.3.3V by power supply being provided for after the LM2675M-3.3 conversion hardware circuit relevant in the module.

The alternative switching principle:

Effective status signal SYS1 ACT, the SYS2 ACT of two systems and the 24V power supply input signal of block signal (blk out) and two-way insert this module by bus terminal, and the fault status signal of module is exported from bus terminal by the LED lamp indication of front panel and by relay.Export by binding post through the control signal after the alternative switching.For example: P1_S1 is the signal 1 from system one among Fig. 2, P2_S1 be from 1, two signal of the signal of system 2 through alternative logic commutation circuit after final output signal be S1.At this moment, if block signal (blk out) effectively the time, with the signal output of three passages in this module of while locking, i.e. S1 among Fig. 2, S2, the output of S3 all is invalid.When block signal (blk out) is invalid, which passage output the output of each passage selects effectively by SYS1 ACT and SYS2 act state, realize that two get a function of selecting, if SYS1 ACT and SYS2 ACT are simultaneously effectively during the system failure, the Last status that then keeps trigger is avoided wrong selection output.

Claims

1, a kind of module of in DC transmission system, carrying out the output of alternative signal, it is characterized in that: this module comprises at least three signal selecting circuit unit and the effective control circuit of system, each signal selecting circuit unit contains three dual input AND circuit and two dual input OR circuit, No. one of each signal selecting circuit unit, the output of No. two dual input AND circuit inserts two inputs of an OR circuit, the output of an OR circuit inserts an input of three AND gate circuit, another input of this AND circuit is connected into block signal by not gate, the output of this AND circuit is connected into an input of No. two OR circuit, the output of this OR circuit is the alternative output, No. of each signal selecting circuit unit, one of them input of No. two dual input AND circuit connects the corresponding setting signal of two systems respectively; The effective control circuit of system contains an OR circuit, two dual input AND circuit and a rest-set flip-flop circuit, two outputs of rest-set flip-flop circuit respectively with No. of each signal selecting circuit unit, another input of two AND gate circuit connects, two inputs of rest-set flip-flop circuit are connected with the output of two dual input AND circuit of system effective control circuit respectively, the input of two dual input AND circuit respectively with effective control signal (the SYS1 ACT of system of two systems, SYS2 ACT) connects, another input of two dual input AND circuit all is connected into the output of the OR circuit of the effective control circuit of system, and two inputs of this OR circuit are respectively applied for effective control signal (the SYS1 ACT of system with two systems, SYS2 ACT) connects.