CN204440088U - Output switch parameter self-protection circuit - Google Patents

Abstract

A kind of output switch parameter self-protection circuit, relate to technical field of industrial control, what solve is the technical matters facilitating system maintenance.This circuit comprises output relay, Hall current sensor and door, and for the output driver module of driver output relay deciliter; The drive singal output terminal of described output driver module receives the control end of output relay, and the former limit output terminal of Hall current sensor is received on a stationary contact of output relay; The described secondary voltage output terminal receiving Hall current sensor with an input end of door, another input end receives on-off model source, receives with the output terminal of door the source signal input end exporting driver module.The circuit that the utility model provides, is specially adapted to the switching value output module of the Digital Control platform based on FPGA technology.

Description

Output switch parameter self-protection circuit

Technical field

The utility model relates to industrial control technology, particularly relates to a kind of technology of output switch parameter self-protection circuit.

Background technology

Modern industry industry (as chemical industry controls, nuclear power industry etc.), requires that the whole flow process (input, controller export) controlled all will have higher reliabilty and availability.But the abominable of industrial environment, cause the short circuit event of equipment and cable to happen occasionally.After occurring for preventing short circuit event, damage being caused to relevant device, being generally equipped with fuse all in the loop to prevent electric current excessive.But the outfit of fuse needs to consider in systems in which, fuse is once use substantially simultaneously, and need to change in addition if broken down, need touch other parts of system in Renewal process unavoidably, add the probability of the system failure, system maintenance is very inconvenient.

Summary of the invention

For the defect existed in above-mentioned prior art, technical problem to be solved in the utility model is to provide a kind of output switch parameter self-protection circuit that can facilitate system maintenance.

In order to solve the problems of the technologies described above, a kind of output switch parameter self-protection circuit provided by the utility model, it is characterized in that: this circuit comprises output relay, Hall current sensor and door, and for the output driver module of driver output relay deciliter;

The drive singal output terminal of described output driver module receives the control end of output relay, and the former limit output terminal of Hall current sensor is received on a stationary contact of output relay;

The described secondary voltage output terminal receiving Hall current sensor with an input end of door, another input end receives on-off model source, receives with the output terminal of door the source signal input end exporting driver module.

The output switch parameter self-protection circuit that the utility model provides; utilize the current situation of Hall current sensor on-line monitoring output circuit, and by with the coordinating of door, realize the self-protection to load; nor need frequently to change relay, can system maintenance be facilitated.

Accompanying drawing explanation

Fig. 1 is the structural representation of the output switch parameter self-protection circuit of the utility model embodiment.

Embodiment

Illustrate below in conjunction with accompanying drawing and be described in further detail embodiment of the present utility model, but the present embodiment is not limited to the utility model, every employing analog structure of the present utility model and similar change thereof, all should list protection domain of the present utility model in.

As shown in Figure 1, a kind of output switch parameter self-protection circuit that the utility model embodiment provides, it is characterized in that: this circuit comprise output relay D1, Hall current sensor U3, with door U2, and for the output driver module U1 of driver output relay deciliter;

The drive singal output terminal of described output driver module U1 receives the control end of output relay D1, and the former limit output terminal of Hall current sensor U3 is received on a stationary contact of output relay D1;

The described secondary voltage output terminal receiving Hall current sensor U3 with an input end of door U2, another input end receives on-off model source S1, receives with the output terminal of door U2 the source signal input end exporting driver module U1.

In the utility model embodiment, what described Hall current sensor adopted is model is the Hall current sensor chip of ACS710KLATR, described to be model the be SN74AHCT1G08DCK adopted with door with door chip.

The use-pattern of the utility model embodiment is as follows:

The former limit of output relay D1 and Hall current sensor U3 is serially connected in the current supply circuit of load R1, makes the supply current of load R1 flow through output relay D1 and Hall current sensor U3;

Hall current sensor U3 sets activation threshold value by divider resistance in advance, when Hall current sensor U3 detects that the supply current of load R1 does not exceed activation threshold value, the secondary voltage output terminal output logic 1 of Hall current sensor U3 to door U2, now consistent with the output signal of door U2 and the output signal of on-off model source S1, the output signal of on-off model source S1 by export driver module U1 control output relay D1 deciliter, thus realize the power supply control to load R1;

When Hall current sensor U3 detects that the supply current of load R1 exceedes activation threshold value; the secondary voltage output terminal output logic 0 of Hall current sensor U3 to door U2; now with door U2 output low level signal; make to export the open circuit that driver module U1 controls output relay D1; thus the power supply disconnected load R1, realize the protection to load R1.

The utility model embodiment is specially adapted to the switching value output module of the Digital Control platform based on FPGA technology; its self-protection function can realize the automatic monitoring to output circuit electric current; when short-circuited outside event causes the moment of electric current to be increased beyond setting limit value; this protection circuit can open output relay automatically; the power supply of disconnecting consumers; prevent from, because overrate damages relay and switching value output module, the industrial circles such as nuclear power, thermoelectricity, wind-powered electricity generation, chemical industry to be widely used in parametric controller.

Claims (1)

1. an output switch parameter self-protection circuit, is characterized in that: this circuit comprises output relay, Hall current sensor and door, and for the output driver module of driver output relay deciliter;

The drive singal output terminal of described output driver module receives the control end of output relay, and the former limit output terminal of Hall current sensor is received on a stationary contact of output relay;

The described secondary voltage output terminal receiving Hall current sensor with an input end of door, another input end receives on-off model source, receives with the output terminal of door the source signal input end exporting driver module.