Switching value signal conversion circuit

Abstract

The utility model discloses a switching value signal conversion circuit which is composed of a power supply prompting unit; the power supply prompting unit comprises a resistor R1 and a light emitting diode LED1; an input signal unit; the input signal unit comprises an input signal end IN, a light emitting diode LED2 and a light emitting diode LED3; a conversion circuit unit; the conversion circuit comprises a resistor R2, a resistor R3, a resistor R4, an optocoupler U1, a comparator U2 and a diode D1; an output signal unit; the output signal unit comprises a resettable fuse F1 and an output signal end OUT. According to the switching value signal conversion circuit, the PCB is adopted for packaging, when the input end IN is connected with a high level, the output end OUT outputs a low level, when the input end IN is connected with the low level, the output end OUT outputs the high level, signal isolation between the input signal unit and the output signal unit is achieved through the optocoupler U1 in the conversion circuit unit, and the switching value signal conversion circuit can be applied to the field of industrial control.

Description

Technical Field

[0001] The utility model relates to the field of industrial control, in particular to a switching quantity signal conversion circuit. Background Art

[0002] At present, sensors in the field of industrial automation control that output switching quantity signals are divided into high-level signal output or low-level signal output. In actual applications, when the signal output by the sensor is opposite to the signal of the switching quantity acquisition module, a small intermediate relay wiring is usually used to achieve the conversion of the level signal. Such operation and wiring are troublesome, the signal response speed is relatively slow, and the contact life of the small intermediate relay is low, which affects the production efficiency. Summary of the Invention

[0003] The purpose of the utility model is to provide a switching quantity signal conversion circuit that is convenient to use, has a fast response speed and a long service life.

[0004] The utility model is implemented by the following technical solutions: A switching signal conversion circuit, characterized by comprising a power supply prompting unit, an input signal unit, a conversion circuit unit, and an output signal unit; the power supply prompting unit includes a resistor R1 and a light-emitting diode LED1; one end of the resistor R1 is connected to VCC, the other end of the resistor R1 is connected to the anode of the light-emitting diode LED1, and the cathode of the light-emitting diode LED1 is connected to GND; the input signal unit includes an input signal terminal IN, a light-emitting diode LED2, and a light-emitting diode LED3; the input signal terminal IN is respectively connected to the anode of the light-emitting diode LED2 and the cathode of the light-emitting diode LED3, and the cathode of the light-emitting diode LED2 and the anode of the light-emitting diode LED3 are connected together; the conversion circuit unit includes a resistor R2, a resistor R3, a resistor R4, an optocoupler U1, a comparator U2, and a diode D1; one end of the resistor R2 is connected to VCC, the other end of the resistor R2 is respectively connected to the 3rd terminal of the comparator U2 and one end of the resistor R3, the other end of the resistor R3 is connected to the 1st terminal of the optocoupler U1, the 2nd terminal of the optocoupler U1 is connected to the anode of the light-emitting diode LED3 in the input signal unit, the 3rd terminal of the optocoupler U1 is connected to one end of the resistor R4, the other end of the resistor R4 is connected to the cathode of the light-emitting diode LED2 in the input signal unit, the 4th terminal of the optocoupler U1 is connected to the 1st terminal of the comparator U2, the 5th terminal of the optocoupler U1 is connected to GND, the 6th terminal of the optocoupler U1 is connected to the 7th terminal of the optocoupler U1, the 8th terminal of the optocoupler U1 is connected to VCC, the 2nd terminal of the comparator U2 is connected to the anode of the light-emitting diode LED2 in the input signal unit, the 4th terminal of the comparator U2 is connected to the anode of the diode D1, the cathode of the diode D1 is connected to GND, and the 8th terminal of the comparator U2 is connected to VCC; the output signal unit includes a self-resetting fuse F1 and an output signal terminal OUT; the self-resetting fuse F1 is connected to the 6th terminal of the optocoupler U1 in the conversion circuit unit, and the other end of the self-resetting fuse F1 is connected to the output signal terminal OUT.

[0005] Further, the optocoupler U1 is selected as a MOS output tube.

[0006] Further, the comparator U2 is selected as an LM393 voltage comparator.

[0007] Further, the diode D1 is selected as a switching diode.

[0008] Further, the self-resetting fuse F1 is selected as a self-resetting fuse with overcurrent protection. Description of the Drawings

[0009] Figure 1 is the schematic diagram of the utility model.

[0010] Figure 2 is the front view of the PCB board of the utility model.

[0011] Figure 3 This is the inclined view of the PCB board of the present utility model. Specific embodiments

[0012] Next, in combination with the drawings in the present utility model, and Figure 1 on the premise that the VCC and GND power supplies in are normal, the technical solutions in the present utility model will be described in detail.

[0013] As Figure 1 shown, the present utility model provides a switching signal conversion circuit, which includes a power supply prompt unit, an input signal unit, a conversion circuit unit, and an output signal unit.

[0014] When the input signal terminal IN is at a high level, the voltage at the 2nd terminal of the comparator U2 is higher than the voltage at the 3rd terminal of the comparator U2, then the 1st terminal of the comparator U2 outputs a low level. At this time, the current forms a loop from the input signal terminal IN through LED2, R4, the 3rd terminal of the optocoupler U1, the 4th terminal of the optocoupler U1, the 1st terminal of the comparator U2, the 4th terminal of the comparator U2, the diode D1, and finally to GND. The 5th terminal and the 6th terminal of the optocoupler U1 are conducted, so as to realize that the output terminal OUT is at a low level.

[0015] When the input signal terminal IN is at a low level, the voltage at the 3rd terminal of the comparator U2 is higher than the voltage at the 2nd terminal of the comparator U2, then the 1st terminal of the comparator U2 outputs a high level. At this time, the current forms a loop from VCC through R2, R3, the 1st terminal of the optocoupler U1, the 2nd terminal of the optocoupler U1, LED3, and finally flows out from the input signal terminal IN. The 8th terminal and the 7th terminal of the optocoupler U1 are conducted, so as to realize that the output terminal OUT is at a high level.

[0016] When there is no signal at the input signal terminal IN, the voltage at the 3rd terminal of the comparator U2 is higher than the voltage at the 2nd terminal of the comparator U2, then the 1st terminal of the comparator U2 outputs a high level. The 1st terminal, the 2nd terminal, the 3rd terminal, and the 4th terminal of the optocoupler U1 are not conducted, so there is no signal output at the output terminal OUT either.

[0017] As Figure 2 and Figure 3 shown, the drawn PLB board will finally be installed in a flame-retardant insulating material, and the VCC terminal, GND terminal, signal input terminal IN, and signal output terminal OUT of the PLB board will be prefabricated with lead wires for wiring during actual application.

Claims

1. A switching quantity signal conversion circuit, characterized in that It includes a power supply prompt unit, an input signal unit, a conversion circuit unit, and an output signal unit; The power supply prompt unit includes a resistor R1 and a light-emitting diode LED1; one end of the resistor R1 is connected to VCC, the other end of the resistor R1 is connected to the anode of the light-emitting diode LED1, and the cathode of the light-emitting diode LED1 is connected to GND; The input signal unit includes an input signal terminal IN, a light-emitting diode LED2, and a light-emitting diode LED3; the input signal terminal IN is respectively connected to the anode of the light-emitting diode LED2 and the cathode of the light-emitting diode LED3, and the cathode of the light-emitting diode LED2 and the anode of the light-emitting diode LED3 are connected together; The conversion circuit unit includes a resistor R2, a resistor R3, a resistor R4, an optocoupler U1, a comparator U2, and a diode D1; one end of the resistor R2 is connected to VCC, the other end of the resistor R2 is respectively connected to the 3rd terminal of the comparator U2 and one end of the resistor R3, the other end of the resistor R3 is connected to the 1st terminal of the optocoupler U1, the 2nd terminal of the optocoupler U1 is connected to the anode of the light-emitting diode LED3 in the input signal unit, the 3rd terminal of the optocoupler U1 is connected to one end of the resistor R4, the other end of the resistor R4 is connected to the cathode of the light-emitting diode LED2 in the input signal unit, the 4th terminal of the optocoupler U1 is connected to the 1st terminal of the comparator U2, the 5th terminal of the optocoupler U1 is connected to GND, the 6th terminal of the optocoupler U1 is connected to the 7th terminal of the optocoupler U1, the 8th terminal of the optocoupler U1 is connected to VCC, the 2nd terminal of the comparator U2 is connected to the anode of the light-emitting diode LED2 in the input signal unit, the 4th terminal of the comparator U2 is connected to the anode of the diode D1, the cathode of the diode D1 is connected to GND, and the 8th terminal of the comparator U2 is connected to VCC; The output signal unit includes a self-resetting fuse F1 and an output signal terminal OUT; the self-resetting fuse F1 is connected to the 6th terminal of the optocoupler U1 in the conversion circuit unit, and the other end of the self-resetting fuse F1 is connected to the output signal terminal OUT.

2. The switching quantity signal conversion circuit according to claim 1, characterized in that, The optocoupler U1 is selected as a MOS output tube.

3. The switching quantity signal conversion circuit according to claim 1, wherein The comparator U2 is selected as an LM393 voltage comparator.

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