CN214412700U

CN214412700U - Universal switching value input circuit

Info

Publication number: CN214412700U
Application number: CN202023008393.0U
Authority: CN
Inventors: 韩宁; 刘锡安; 赵松
Original assignee: Qingdao CCS Electric Corp
Current assignee: Qingdao CCS Electric Corp
Priority date: 2020-12-15
Filing date: 2020-12-15
Publication date: 2021-10-15
Anticipated expiration: 2030-12-15

Abstract

The utility model discloses a general switching value input circuit, which comprises a wiring terminal, a Schmidt reverse trigger, an isolation optocoupler and an isolation power supply; a connecting terminal introduces a passive or active signal to a Schmidt reverse trigger, the output of the trigger is connected with the input of an isolation optocoupler, and the output of the isolation optocoupler is a switching signal of an application circuit; the isolation power supply and the isolation optocoupler realize the electrical isolation of the switching value input part from other application circuits, and provide possibility for the input distinction of active signals and passive signals; the wiring terminal comprises a power input pin, different signal input requirements of active signal input and passive signal input can be realized through a jumper wire, and a mixed connection mode of multiple switching values and different signal sources is realized; the Schmitt reverse trigger has high input impedance and high load capacity, realizes the low-energy excitation requirement of switching value input, meets the high load capacity of the driving isolation optocoupler, has signal filtering capacity, and can play a better effect in pulse signal extraction.

Description

Universal switching value input circuit

Technical Field

The utility model belongs to the technical field of circuit design, specifically speaking relates to a general switching value input circuit.

Background

In the occasions of industrial control related to switching values, no effective unified standard exists basically, and the switching value signal output forms are various, active or passive and have different voltage sizes.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a general switching value input circuit solves the above-mentioned technical problem of current switching value input circuit.

The utility model discloses a following technical scheme realizes:

a general switching value input circuit is provided, which comprises: the wiring terminal is provided with an input pin, a power supply access pin and a grounding pin; the power supply access pin is connected with a first power supply; the input end of the Schmitt reverse trigger is connected with the input pin of the wiring terminal; the input end of the isolation optocoupler is connected with the output end of the Schmidt reverse trigger, and the output end of the isolation optocoupler outputs a general switch signal; the input end of the isolation power supply is connected with the first power supply, and the output of the isolation power supply supplies power to the Schmitt reverse trigger; when the input switching value is an active signal, the power supply access pin of the wiring terminal is vacant, and when the input switching value is a passive signal, the input pin of the wiring terminal is connected with the power supply access pin.

Furthermore, the input end of the Schmidt reverse trigger is connected with a voltage division clamping circuit; the voltage division clamping circuit comprises a first resistor, a second resistor and a first diode; one end of the first resistor is connected with the input end of the Schmidt reverse trigger, and the other end of the first resistor is connected with the input pin of the wiring terminal; one end of the second resistor is connected with the input end of the Schmidt reverse trigger, and the other end of the second resistor is grounded; the first diode is connected in parallel with the second resistor.

Furthermore, a voltage regulator tube is connected to the connection end of the first resistor and the input pin of the connection terminal in a grounding manner.

Furthermore, a fuse is connected between the first resistor and an input pin of the wiring terminal.

Further, the input end of the schmitt reverse trigger is connected with a filter capacitor in a grounding mode.

Furthermore, a switch is connected between the input pin of the wiring terminal and the power supply access pin.

Compared with the prior art, the utility model discloses an advantage is with positive effect: the utility model provides a general switching value input circuit, isolation power supply and isolation optocoupler realize the electrical isolation of the switching value input part from other application circuits, and provide possibility for the input distinction of active signals and passive signals; the wiring terminal comprises a power input pin, different signal input requirements of active signal input and passive signal input can be realized through a jumper wire, and a mixed connection mode of multiple switching values and different signal sources is realized; the Schmitt reverse trigger has high input impedance and high load capacity, realizes the low-energy excitation requirement of switching value input, meets the high load capacity of the driving isolation optocoupler, has signal filtering capacity, and can play a better effect in pulse signal extraction.

Furthermore, the stability of the input end of the Schmidt reverse trigger, the protection function of the reverse connection of the signal wire, the filtering anti-interference function of the input signal, the overvoltage protection and overcurrent protection and the like are ensured by measures such as a voltage division clamping circuit, a voltage stabilizing tube, a fuse protector, a filter capacitor and the like.

Other features and advantages of the present invention will become more apparent from the following detailed description of embodiments of the invention, which is to be read in connection with the accompanying drawings.

Drawings

Fig. 1 is a circuit architecture diagram of a universal switch input circuit according to the present invention;

FIG. 2 is a second circuit structure diagram of the universal switch input circuit of the present invention

Fig. 3 is a circuit diagram of a first embodiment of a universal switch input circuit according to the present invention.

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

As shown in fig. 1, the utility model provides a general switching value input circuit, include: a terminal J1, a Schmidt reverse trigger U1, an isolation optocoupler U2 and an isolation power supply U3.

The connection terminal J1 has an INPUT pin INPUT, a power supply access pin P and a ground pin G; the power supply access pin P is connected with a first power supply POW; the first power supply POW is an input power supply of the isolation power supply U3.

The INPUT end a of the schmitt reverse trigger U1 is connected to the INPUT pin INPUT of the connection terminal J1, and when the INPUT pin INPUT of the connection terminal J1 is multiple, the schmitt reverse trigger U1 can be connected in a butt joint mode. The output end Y of the Schmitt reverse trigger U1 is connected with the input end of the isolation optocoupler U2, and the output of the isolation optocoupler U2 is a universal switching signal output by the whole universal switching value input circuit.

The input end of the isolation power supply U3 is connected with a first power supply POW, and the output end of the isolation power supply U3 supplies power for the Schmitt reverse trigger.

Based on the circuit, when the INPUT switching value is an active signal, the power access pin of the connection terminal J1 is idle, and when the INPUT switching value is a passive signal, the INPUT pin of the connection terminal J1 is jumper-connected with the power access pin thereof, or is realized by closing the switch K connected between the INPUT pin INPUT of the connection terminal J1 and the power access pin P.

Above-mentioned the utility model provides a general switching value input circuit, isolation power U3 and isolation opto-coupler U2 have realized the electrical isolation of switching value input part and other application circuit, provide probably for the input differentiation of active signal and passive signal; the wiring terminal J1 comprises a power input pin P, and different signal input requirements of active signal input and passive signal input can be realized through a jumper wire, so that a mixed connection mode of multiple switching values and different signal sources is realized; the Schmitt reverse trigger U1 has high input impedance and high load capacity, can meet the low-energy excitation requirement of switching value input, can meet the high load capacity of a driving isolation optocoupler, has signal filtering capacity, and can play a better effect in pulse signal extraction.

As shown in fig. 2, in the embodiment of the present invention, the input terminal of the schmitt reverse trigger U1 is connected to a voltage dividing and clamping circuit U4; specifically, the voltage division clamp circuit U4 includes a first resistor R1, a second resistor R2, and a first diode D1; one end of the first resistor R1 is connected with an INPUT end A of the Schmidt reverse trigger U1, and the other end of the first resistor R1 is connected with an INPUT pin INPUT of the wiring terminal J1; one end of the second resistor R2 is connected with the input end A of the Schmidt reverse trigger U1, and the other end is grounded G; the first diode D1 is connected in parallel with the second resistor R2.

The voltage division clamping circuit U4 can ensure the stability of the voltage at the input end of the Schmidt reverse trigger U1 and can play a role in protecting the reverse connection of signal lines.

As shown in fig. 2, in the embodiment of the present invention, a voltage regulator Z is connected to the ground at the connection end of the first resistor R1 and the INPUT pin INPUT of the connection terminal J1, so as to form an overvoltage protection function for the INPUT end of the schmidt reverse trigger U1.

As shown in fig. 2, in the embodiment of the present invention, a fuse F is connected between the first resistor R1 and the INPUT pin INPUT of the terminal J1, and forms an overcurrent protection function at the INPUT end of the schmitt reverse trigger U1.

As shown in fig. 2, in the embodiment of the present invention, the INPUT of the schmitt reverse trigger U1 is connected to the ground by the filter capacitor C, which plays a role in filtering and anti-jamming for the INPUT of the schmitt reverse trigger U1.

The following describes in detail the application of the general switching value input circuit provided by the present invention with several embodiments.

Example one

As shown in fig. 3, the passive signal input embodiment uses the power pin P of the terminal J1 to introduce the first power POW to supply power to the passive signal by jumping or closing the switch K1 and the switch K2.

The passive signals INPUT1 and INPUT2 output stable switching value signals to an isolation optocoupler U2 through a Schmidt reverse trigger U1, and output the stable switching value signals to an application circuit through an isolation optocoupler U2.

Example two

In this embodiment, the active signal input embodiment is implemented by using the power of the other switching value output module as the signal source and leaving the power input pin P of the connection terminal J1 empty.

Active signals INPUT1 and INPUT2 (K1 and K2 are closed) output stable switching value signals to an isolation optocoupler U2 through a Schmitt reverse trigger U1 and output to an application circuit through an isolation optocoupler U2.

EXAMPLE III

The embodiment is an embodiment for inputting an active signal and a passive signal simultaneously, a first power supply POW is introduced to supply power for a passive signal INPUT1 by using a power supply access pin P of a wiring terminal J1 through a jumper or a closed switch K1, so that the power supply of an INPUT2 output module is used as a source of the active signal, the INPUT1 and the INPUT2 respectively output a stable switching value signal to an isolation optocoupler U2 through a schmidt reverse trigger U1a and a switch U1b, and the stable switching value signal is output to an application circuit through an isolation optocoupler U2.

It should be noted that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and the changes, modifications, additions or substitutions made by those skilled in the art within the spirit of the present invention should also belong to the protection scope of the present invention.

Claims

1. A universal switching value input circuit, comprising:

the wiring terminal is provided with an input pin, a power supply access pin and a grounding pin; the power supply access pin is connected with a first power supply;

the input end of the Schmitt reverse trigger is connected with the input pin of the wiring terminal;

the input end of the isolation optocoupler is connected with the output end of the Schmidt reverse trigger, and the output end of the isolation optocoupler outputs a general switch signal;

the input end of the isolation power supply is connected with the first power supply, and the output of the isolation power supply supplies power to the Schmitt reverse trigger;

when the input switching value is an active signal, the power supply access pin of the wiring terminal is vacant, and when the input switching value is a passive signal, the input pin of the wiring terminal is connected with the power supply access pin.

2. The universal switching value input circuit according to claim 1, wherein a voltage division clamping circuit is connected to an input end of the schmitt reverse trigger;

the voltage division clamping circuit comprises a first resistor, a second resistor and a first diode; one end of the first resistor is connected with the input end of the Schmidt reverse trigger, and the other end of the first resistor is connected with the input pin of the wiring terminal; one end of the second resistor is connected with the input end of the Schmidt reverse trigger, and the other end of the second resistor is grounded; the first diode is connected in parallel with the second resistor.

3. The universal switching value input circuit according to claim 2, wherein a voltage regulator tube is connected to a connection terminal of the first resistor and the input pin of the connection terminal in a grounded manner.

4. The universal switching value input circuit according to claim 2, wherein a fuse is connected between the first resistor and the input pin of the connection terminal.

5. The universal switching value input circuit according to claim 2, wherein the input terminal of the schmitt reverse trigger is connected to a ground terminal by a filter capacitor.

6. The universal switching value input circuit according to claim 1, wherein a switch is connected between the input pin of the connection terminal and the power supply connection pin.