CN220874521U

CN220874521U - Three-wire system proximity sensor

Info

Publication number: CN220874521U
Application number: CN202322507138.8U
Authority: CN
Inventors: 郑海映
Original assignee: Wenzhou Dongtou Huagan Electric Co ltd
Current assignee: Wenzhou Dongtou Huagan Electric Co ltd
Priority date: 2023-09-15
Filing date: 2023-09-15
Publication date: 2024-04-30
Anticipated expiration: 2033-09-15

Abstract

The utility model discloses a three-wire system proximity sensor, which comprises a main circuit and an integrated unit connected into the main circuit, wherein the integrated unit is connected with the main circuit; the integrated unit comprises an operational amplifier module, a resistor R8, a resistor R9 and a resistor R10; the 3 pin of the operational amplifier U1A is connected with one end of a resistor R9, the 5 pin of the operational amplifier U1B and one end of a resistor R10, the other end of the resistor R9 and the 8 pin of the operational amplifier U1A are both connected with a positive power supply end, and the other end of the resistor R10 and the 4 pin of the operational amplifier U1B are both connected with a negative power supply end; the 2 pin of the operational amplifier U1A is connected to one end of a resistor R8, the other end of the resistor R8 is connected to the 1 pin of the operational amplifier U1A and the 6 pin of the operational amplifier U1B, and the 7 pin of the operational amplifier U1B is used as an output end to be connected to a signal line. The utility model has the following advantages and effects: the rear stage can be driven better, and the normally open and normally closed state can be conveniently converted through the output of the signal wire, so that great convenience is brought to practical use.

Description

Three-wire system proximity sensor

Technical Field

The utility model relates to the field of proximity sensors, in particular to a three-wire system proximity sensor.

Background

A proximity sensor is a device having a capability of sensing the proximity of an object, which can recognize the proximity and the distant of an object by using the characteristic that a displacement sensor has sensitivity to the proximity of the object and output a corresponding switching signal, and thus, the proximity sensor is also called a proximity switch in general. The existing proximity sensor adopts a non-integrated internal circuit, and has the defects of poor driving effect and complex switching of normally open and normally closed states.

Disclosure of utility model

The utility model aims to provide a three-wire system proximity sensor so as to solve the problems in the background art.

The technical aim of the utility model is realized by the following technical scheme: a three-wire system proximity sensor comprises a main circuit for identifying the approaching and the separating of an object, and an integrated unit connected into the main circuit;

The integrated unit comprises an operational amplifier module, a resistor R8, a resistor R9 and a resistor R10; the operational amplifier module consists of an operational amplifier U1A and an operational amplifier U1B; the 3 pin of the operational amplifier U1A is connected with one end of a resistor R9, the 5 pin of the operational amplifier U1B and one end of a resistor R10, the other end of the resistor R9 and the 8 pin of the operational amplifier U1A are both connected with a positive power supply end, and the other end of the resistor R10 and the 4 pin of the operational amplifier U1B are both connected with a negative power supply end; the 2 pin of the operational amplifier U1A is connected to one end of a resistor R8, the other end of the resistor R8 is connected to the 1 pin of the operational amplifier U1A and the 6 pin of the operational amplifier U1B, and the 7 pin of the operational amplifier U1B is used as an output end to be connected to a signal line.

The further arrangement is that: the model of the operational amplifier module is LM2904.

The further arrangement is that: the main circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a diode D1, a diode D2, a diode D3, a light emitting diode LED1, a triode Q2, a triode Q3, a triode Q4, a triode Q5 and an oscillating coil T1;

One end of a resistor R1 is respectively connected with one end of a resistor R2 and the collector electrode of a triode Q1, the end is simultaneously connected with the positive electrode power supply end, the other end of the resistor R1 is connected with a signal wire, the other end of the resistor R2 is connected with the base electrode of the triode Q1 and the negative electrode of a diode D1, the positive electrode of the diode D1 is connected with the negative electrode power supply end, and the emitter electrode of the triode Q1 is connected with the 8 pin of an operational amplifier U1A; the 2 pin of the operational amplifier U1A is connected with one end of a resistor R11, the other end of the resistor R11 is connected with one end of a capacitor C2, the collector of a triode Q4 and one end of a resistor R12, the other end of the capacitor C2 is connected with the 8 pin of the operational amplifier U1A, and the other end of the resistor R12 is connected with a negative electrode power supply end; the emitter of the triode Q4 is connected with one end of a resistor R14, the other end of the resistor R14 is connected with an oscillating coil T1, one end of the oscillating coil T1 is respectively connected with one end of a capacitor C3 and one end of the capacitor C4, and the ends are simultaneously connected with the 8 pins of an operational amplifier U1A; the other end of the oscillating coil T1 is connected with the other end of the capacitor C3 and is simultaneously connected with the emitter of the triode Q5, the base of the triode Q4 is connected with the base of the triode Q5, the end is simultaneously connected with one end of the resistor R13, and the other end of the resistor R13 and the other end of the capacitor C4 are both connected with the negative electrode power supply end; the collector electrode of the triode Q5 is suspended; the pin 7 of the operational amplifier U1B is connected with one end of a resistor R5 and one end of a light emitting diode LED1, the other end of the resistor R5 is connected with the positive electrode of a diode D3 and one end of a resistor R6, the other end of the resistor R6 is connected with one end of a resistor R4, one end of a capacitor C1 and the base electrode of a triode Q3, and the other end of the resistor R4, the other end of the capacitor C1 and the emitter electrode of the triode Q3 are all connected with a negative electrode power supply end; the other end of the light emitting diode LED1 is connected with one end of a resistor R7, the other end of the resistor R7 is connected with a collector electrode of a triode Q3, one end of the resistor R3 and a base electrode of a triode Q2, the other end of the resistor R3 and an emitting electrode of the triode Q2 are grounded, the collector electrode of the triode Q2 is connected with a negative electrode of a diode D3 and a negative electrode of a diode D2, the ends are simultaneously connected with a signal wire, and an anode of the diode D2 is connected with a negative electrode power supply end.

The utility model has the beneficial effects that:

The integrated unit is connected into the main circuit, and is processed based on the two operational amplifiers in the integrated unit, so that the rear stage can be driven better, and the normally open and normally closed state can be converted conveniently through the output of the signal line, thereby bringing great convenience to practical use.

Drawings

Fig. 1 is a circuit diagram of an embodiment.

Detailed Description

The present utility model will be described in further detail with reference to the accompanying drawings.

As shown in fig. 1:

the embodiment discloses a three-wire system proximity sensor, which comprises a main circuit for identifying the approaching and the separating of an object, and an integrated unit connected into the main circuit;

The model of the operational amplifier module is LM2904.

The main circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a diode D1, a diode D2, a diode D3, a light emitting diode LED1, a triode Q2, a triode Q3, a triode Q4, a triode Q5 and an oscillating coil T1;

It should be noted that, the present embodiment discloses a detailed circuit diagram, and a worker skilled in the electronic field should and should know the implementation of the present circuit.

The present embodiment is only for explanation of the present utility model and is not to be construed as limiting the present utility model, and modifications to the present embodiment, which may not creatively contribute to the present utility model as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present utility model.

Claims

1. A three-wire proximity sensor, characterized by: the device comprises a main circuit for identifying the approaching and the separating of an object, and an integrated unit connected into the main circuit;

2. A three-wire proximity sensor as defined in claim 1, wherein: the model of the operational amplifier module is LM2904.

3. A three-wire proximity sensor as defined in claim 2, wherein: the main circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a diode D1, a diode D2, a diode D3, a light emitting diode LED1, a triode Q2, a triode Q3, a triode Q4, a triode Q5 and an oscillating coil T1;