阅读说明：本技术 一种自反射光电管抗干扰电路 (Self-reflection photoelectric tube anti-interference circuit ) 是由 胡冰 于 2019-08-26 设计创作，主要内容包括：一种自反射光电管抗干扰电路,涉及电路设计领域,解决了发射光电管和接收光电管抗干扰的问题以及使用寿命的问题。该电路包括运算比较器、通用锁相环电路音调译码器、NPN型三极管、第一电阻至第九电阻、对外接插件、第一电容、第二电容、第三电容、第四电容、发射光电管、接收光电管、状态显示LED灯。本发明采用了由通用锁相环电路音调译码器及相关元器件组成的频率合成及解码电路,同时采用了由运算比较器及相关元器件组成的运算放大电路,采用上述两个电路给光电管供电,能够极大的提高光电管的使用寿命,延长光电管的老化速度,同时还具有抗干扰的作用；同时电路接收端采用解码接收的方式,保证了接收电路的可靠性,避免受到外界干扰。(The utility model provides a self-reflection photoelectric tube anti-jamming circuit, relates to the circuit design field, has solved and has emitted the photoelectric tube and received the anti-jamming problem of photoelectric tube and life's problem. The circuit comprises an operation comparator, a general phase-locked loop circuit tone decoder, an NPN type triode, a first resistor to a ninth resistor, an external connector, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a transmitting photoelectric tube, a receiving photoelectric tube and a state display LED lamp. The invention adopts the frequency synthesis and decoding circuit composed of the general phase-locked loop circuit tone decoder and the related components, and simultaneously adopts the operational amplification circuit composed of the operational comparator and the related components, and the two circuits are adopted to supply power to the photoelectric tube, thereby greatly prolonging the service life of the photoelectric tube, prolonging the aging speed of the photoelectric tube, and having the function of anti-interference; meanwhile, the receiving end of the circuit adopts a decoding receiving mode, so that the reliability of the receiving circuit is ensured, and the receiving circuit is prevented from being interfered by the outside.)

1. A self-reflecting photoelectric tube anti-jamming circuit is characterized by comprising:

the circuit comprises an operational comparator (D1), a general phase-locked loop circuit tone decoder (D2), an NPN type triode (V1), a first resistor (R1), a second resistor (R2), a third resistor (R3), a fourth resistor (R4), a fifth resistor (R5), a sixth resistor (R6), a seventh resistor (R7), an eighth resistor (R8), a ninth resistor (R9), an external plug-in (XS1), a first capacitor (C1), a second capacitor (C2), a third capacitor (C3), a fourth capacitor (C4), a transmitting photoelectric tube (HL1), a state display LED lamp (HL2) and a receiving photoelectric tube (HL 3);

pin1 of the general phase-locked loop circuit tone decoder (D2) is connected with one end of a fourth capacitor (C4), pin2 is connected with one end of a second capacitor (C2), pin3 is connected with one end of a third capacitor (C3), pin4 is connected with pin1 of an external connector (XS1), pin5 is connected with one end of a fourth resistor (R4), pin6 is connected with one end of a first capacitor (C1), pin7 is connected with pin4 of the external connector (XS1), and pin8 is connected with pin1 of the third resistor (R3);

the other end of the third capacitor (C3) is connected with one end of a second resistor (R2) and the negative electrode of a receiving photoelectric tube (HL3), the positive electrode of the receiving photoelectric tube (HL3) is connected with one end of a ninth resistor (R9), the other end of the ninth resistor (R9) is connected with a pin1 of an external connector (XS1), and the other end of the fourth capacitor (C4), the other end of the second capacitor (C2) and the other end of the second resistor (R2) are connected and then connected with a pin7 of a general phase-locked loop circuit tone decoder (D2);

the other end of the fourth resistor (R4) is connected with a base electrode of an NPN type triode (V1), an emitting electrode of the NPN type triode (V1) is grounded, a receiving electrode of the NPN type triode (V1) is connected with a negative electrode of an emission photoelectric tube (HL1), a positive electrode of the emission photoelectric tube (HL1) is connected with one end of a fifth resistor (R5), and the other end of the fifth resistor (R5) is connected with a pin1 of an external connector (XS 1);

the other end of the first capacitor (C1) is connected with a pin7 of the general phase-locked loop circuit tone decoder (D2), and two ends of the first resistor (R1) are respectively connected with a pin5 of the general phase-locked loop circuit tone decoder (D2) and a pin6 of the general phase-locked loop circuit tone decoder (D2);

the pin2 of the third resistor (R3) is connected with the pin5 of the operational comparator (D1), the pin1 of the third resistor (R3) is connected with one end of a state display LED lamp (HL2), the other end of the state display LED lamp (HL2) is connected with one end of an eighth resistor (R8), and the other end of the eighth resistor (R8) is connected with the pin1 of an external connector (XS 1);

a pin1 of the operational comparator (D1) is connected with a pin2 of an external connector (XS1), the pin4 is connected with a pin4 of the external connector (XS1), the pin5 is connected with a pin2 of a third resistor (R3), the pin6 is connected with one end of a sixth resistor (R6) and one end of a seventh resistor (R7), a pin7 is connected with a pin3 of the external connector (XS1), and the pin8 is connected with a pin1 of the external connector (XS 1);

the other end of the sixth resistor (R6) is connected with a pin1 of an external connector (XS1), and the other end of the seventh resistor (R7) is grounded;

the pins 1 and 4 of the outer connector (XS1) are externally supplied with DC.

2. The self-reflecting photoelectric tube anti-jamming circuit according to claim 1, characterized in that the model of the operational comparator (D1) is LM 393.

3. The self-reflecting phototransistor interference rejection circuit of claim 1, wherein said generic phase-locked loop circuit tone decoder (D2) is of the type LM 567.

4. The self-reflecting photoelectric tube anti-jamming circuit according to claim 1, wherein the external connector (XS1) has a specification of 1.25mmX 4.

5. The self-reflection photoelectric tube anti-jamming circuit according to claim 1, wherein the second capacitor (C2), the third capacitor (C3), and the fourth capacitor (C4) are all of type X7R.

6. The self-reflecting photoelectric tube anti-jamming circuit according to claim 1, wherein the first resistor (R1) has a resistance of 10K, the second resistor (R2) has a resistance of 47K, the third resistor (R3) has a resistance of 10K, the fourth resistor (R4) has a resistance of 1.5K, the fifth resistor (R5) has a resistance of 1.5K, the sixth resistor (R6) has a resistance of 47K, the seventh resistor (R7) has a resistance of 47K, the eighth resistor (R8) has a resistance of 680 Ω, and the ninth resistor (R9) has a resistance of 1.5K.

7. The self-reflecting photoelectric tube anti-jamming circuit according to claim 1, wherein the capacitance of the first capacitor (C1) is 0.1 μ F, the capacitance of the second capacitor (C2) is 0.1 μ F/50V, the capacitance of the third capacitor (C3) is 0.1 μ F/50V, and the capacitance of the fourth capacitor (C4) is 2.2 μ F/50V.

Technical Field

The invention relates to the technical field of circuit design, in particular to an anti-interference circuit of a self-reflection photoelectric tube.

Background

In an AFC (automatic fare collection) system (urban rail transit) system, a self-reflection photoelectric tube is widely used in subway equipment, the main function of the AFC system is to continuously supply power to a transmitting photoelectric tube and a receiving photoelectric tube, and when an obstacle is detected, the photoelectric tube has level change. In the process, the level of the receiving end of the photoelectric tube changes slightly due to interference, a controller is needed for judgment and software filtering, and when a plurality of photoelectric tubes exist, the CPU efficiency is greatly reduced, which is not beneficial to the stability and the high efficiency of the system; meanwhile, the aging speed of the light emitting tube is accelerated by electrifying the light emitting tube for a long time, the receiving and transmitting distances of the light emitting tube are shortened, and the performance is reduced.

Disclosure of Invention

The invention provides an anti-interference circuit of a self-reflection photoelectric tube, aiming at solving the problems of anti-interference and service life of a transmitting photoelectric tube and a receiving photoelectric tube.

The technical scheme adopted by the invention for solving the technical problem is as follows:

the invention relates to a self-reflection photoelectric tube anti-interference circuit, which comprises:

the device comprises an operation comparator, a general phase-locked loop circuit tone decoder, an NPN type triode, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, an external connector, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a transmitting photoelectric tube, a state display LED lamp and a receiving photoelectric tube;

a pin1 of the general phase-locked loop circuit tone decoder is connected with one end of a fourth capacitor, a pin2 is connected with one end of a second capacitor, a pin3 is connected with one end of the third capacitor, a pin4 is connected with a pin1 of an external connector, a pin5 is connected with one end of a fourth resistor, a pin6 is connected with one end of the first capacitor, a pin7 is connected with a pin4 of the external connector, and a pin8 is connected with a pin1 of the third resistor;

the other end of the third capacitor is connected with one end of the second resistor and the negative electrode of the receiving photoelectric tube, the positive electrode of the receiving photoelectric tube is connected with one end of the ninth resistor, the other end of the ninth resistor is connected with a pin1 of an external connector, and the other end of the fourth capacitor, the other end of the second capacitor and the other end of the second resistor are connected and then connected with a pin7 of the tone decoder of the general phase-locked loop circuit;

the other end of the fourth resistor is connected with a base electrode of the NPN type triode, an emitting electrode of the NPN type triode is grounded, a receiving electrode of the NPN type triode is connected with a negative electrode of the transmitting phototube, an anode of the transmitting phototube is connected with one end of a fifth resistor, and the other end of the fifth resistor is connected with a pin1 of an external connector;

the other end of the first capacitor is connected with a pin7 of the general phase-locked loop circuit tone decoder, and two ends of the first resistor are respectively connected with a pin5 of the general phase-locked loop circuit tone decoder and a pin6 of the general phase-locked loop circuit tone decoder;

the pin2 of the third resistor is connected with the pin5 of the operation comparator, the pin1 of the third resistor is connected with one end of the state display LED lamp, the other end of the state display LED lamp is connected with one end of the eighth resistor, and the other end of the eighth resistor is connected with the pin1 of an external connector;

the pin1 of the operation comparator is connected with the pin2 of the external connector, the pin4 is connected with the pin4 of the external connector, the pin5 is connected with the pin2 of the third resistor, the pin6 is connected with one end of the sixth resistor and one end of the seventh resistor, the pin7 is connected with the pin3 of the external connector, and the pin8 is connected with the pin1 of the external connector;

the other end of the sixth resistor is connected with a pin1 of the external connector, and the other end of the seventh resistor is grounded;

the pins 1 and 4 of the outer connector are externally powered DC.

Further, the specification of the operational comparator is LM 393.

Further, the model of the general phase-locked loop circuit tone decoder is LM 567.

Further, the model of the external connector is 1.25mmX 4.

Furthermore, the models of the second capacitor, the third capacitor and the fourth capacitor are all X7R.

Further, the resistance of the first resistor is 10K, the resistance of the second resistor is 47K, the resistance of the third resistor is 10K, the resistance of the fourth resistor is 1.5K, the resistance of the fifth resistor is 1.5K, the resistance of the sixth resistor is 47K, the resistance of the seventh resistor is 47K, the resistance of the eighth resistor is 680 Ω, and the resistance of the ninth resistor is 1.5K.

Furthermore, the capacitance value of the first capacitor is 0.1 muF, the capacitance value of the second capacitor is 0.1 muF/50V, the capacitance value of the third capacitor is 0.1 muF/50V, and the capacitance value of the fourth capacitor is 2.2 muF/50V.

The invention has the beneficial effects that: the invention adopts the frequency synthesis and decoding circuit composed of the general phase-locked loop circuit tone decoder and the related components, and simultaneously adopts the operational amplification circuit composed of the operational comparator and the related components, and the two circuits are adopted to supply power to the photoelectric tube, thereby greatly prolonging the service life of the photoelectric tube, prolonging the aging speed of the photoelectric tube, and having the function of anti-interference; meanwhile, the receiving end of the circuit adopts a decoding receiving mode, so that the reliability of the receiving circuit is ensured, and the receiving circuit is prevented from being interfered by the outside.

Drawings

Fig. 1 is a circuit diagram of an anti-interference circuit of a self-reflection photoelectric tube according to the present invention.

Fig. 2 is a schematic diagram of a receiving photodiode circuit.

FIG. 3 is a schematic diagram of an operational comparator circuit.

FIG. 4 is a schematic diagram of an external plug-in circuit.

Fig. 5 is a waveform diagram of a transmitting end.

Fig. 6 is a waveform diagram of the receiving end.

Detailed Description

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

As shown in fig. 1 to 4, the names, labels, parameters (resistance, capacitance, etc.) and models of the components of the self-reflection photoelectric tube anti-interference circuit of the present invention are shown in table 1.

TABLE 1

As shown in fig. 1, the general pll circuit tone decoder D2, the first resistor R1, the second resistor R2, the fourth resistor R4, the fifth resistor R5, the ninth resistor R9, the first capacitor C1, the second capacitor C2, the third capacitor C3, the fourth capacitor C4, the NPN transistor V1, the transmitting phototransistor HL1, and the receiving phototransistor HL3 form a frequency synthesis and decoding circuit. The circuit formed by connecting the second resistor R2, the second capacitor C2, the third capacitor C3, the fourth capacitor C4, the ninth resistor R9 and the receiving photoelectric tube HL3 with the general phase-locked loop circuit tone decoder D2 is a frequency decoding circuit; the circuit formed by connecting the first resistor R1, the fourth resistor R4, the fifth resistor R5, the first capacitor C1, the transmitting phototube HL1 and the universal phase-locked loop circuit tone decoder D2 is a frequency synthesis circuit.

A pin1 of the general phase-locked loop circuit tone decoder D2 is connected to one end of a fourth capacitor C4, a pin2 of the general phase-locked loop circuit tone decoder D2 is connected to one end of a second capacitor C2, a pin3 of the general phase-locked loop circuit tone decoder D2 is connected to one end of a third capacitor C3, the other end of the third capacitor C3 is connected to one end of a second resistor R2 and the negative electrode of a receiving phototube HL3, the positive electrode of the receiving phototube HL3 is connected to one end of a ninth resistor R9, the other end of the ninth resistor R9 is connected to a pin1 of an external connector XS1, the other end of the fourth capacitor C4, the other end of the second capacitor C2 and the other end of the second resistor R2 are connected, and the other end of the fourth capacitor C4, the other end of the second capacitor C2 and the second resistor R2 are.

The pins 4 of the general phase-locked loop circuit tone decoder D2 are connected to the pins 1 of the external connector XS 1.

The pin5 of the general phase-locked loop circuit tone decoder D2 is connected with one end of a fourth resistor R4, the other end of the fourth resistor R4 is connected with a base electrode of an NPN type triode V1, an emitting electrode of the NPN type triode V1 is grounded, a receiving electrode of the NPN type triode V1 is connected with a negative electrode of an emitting phototube HL1, an anode of the emitting phototube HL1 is connected with one end of a fifth resistor R5, and the other end of the fifth resistor R5 is connected with the pin1 of an external plug XS 1.

The pin6 of the general phase-locked loop circuit tone decoder D2 is connected to one end of the first capacitor C1, the other end of the first capacitor C1 is connected to the pin7 of the general phase-locked loop circuit tone decoder D2, and both ends of the first resistor R1 are connected to the pin5 of the general phase-locked loop circuit tone decoder D2 and the pin6 of the general phase-locked loop circuit tone decoder D2, respectively.

The pin8 of the general phase-locked loop circuit tone decoder D2 is connected to the pin1 of the third resistor R3 to output the comparison result, and the pin2 of the third resistor R3 is connected to the pin5 of the operational comparator D1 (the input terminal of the operational amplifier D1). As shown in fig. 2, the pin1 of the third resistor R3 is connected to one end of the status display LED lamp HL2, the other end of the status display LED lamp HL2 is connected to one end of the eighth resistor R8, and the other end of the eighth resistor R8 is connected to the pin1 of the external connector XS 1.

As shown in fig. 3, the operational comparator D1, the sixth resistor R6, and the seventh resistor R7 constitute an operational amplifier circuit. As shown in fig. 4, the pair of external connectors XS1 serve as signal, power, input and output controllers for the entire circuit.

The pin1 of the operational comparator D1 is connected to the pin2 of the external connector XS 1.

The pin4 of the operational comparator D1 and the pin7 of the general phase-locked loop circuit tone decoder D2 are both connected to the pin4 of the add-on XS 1.

The pin5 of the operational comparator D1 is connected to the pin2 of the third resistor R3.

The pin6 of the operational comparator D1 is connected to one end of the sixth resistor R6 and one end of the seventh resistor R7, the other end of the sixth resistor R6 is connected to the pin1 of the external connector XS1, and the other end of the seventh resistor R7 is grounded.

The pin7 of the operational comparator D1 is connected to the pin3 of the external connector XS 1.

The pin8 of the operational comparator D1 and the pin4 of the general phase-locked loop circuit tone decoder D2 are both connected to the pin1 of the add-on XS 1.

Pins 1 and pin4 of add-on package XS1 are externally supplied with DC (5V).

In the invention, the output end of the general phase-locked loop circuit tone decoder D2 drives an NPN type triode V1 after adjusting the frequency through an RC filter circuit (a first resistor R1, a fourth resistor R4 and a first capacitor C1), so that a transmitting photoelectric tube HL1 transmits at a fixed frequency; the receiving end of the general phase-locked loop circuit tone decoder D2 is connected to the decoding input end of the general phase-locked loop circuit tone decoder D2, when the receiving end of the general phase-locked loop circuit tone decoder D2 receives the light of the frequency of the transmitting end, the general phase-locked loop circuit tone decoder D2 generates a low level output to the operational comparator D1, the operational comparator D1 adopts LM393 to increase the driving capability of an output interface, and the output is divided into an in-phase output and an inverted output to be detected by an upper computer.

When the circuit is powered on, the output end of the general phase-locked loop circuit tone decoder D2 drives the transmitting phototube HL1 to transmit light waves at the frequency of 1khz, when no object is shielded, the receiving end of the general phase-locked loop circuit tone decoder D2 cannot receive signals, at the moment, the output end of the general phase-locked loop circuit tone decoder D2 does not output, the pin1 of the operational comparator D1 outputs low level, and the pin7 of the operational comparator D1 outputs high level to be detected by an upper computer; when an object is shielded, the receiving end of the general phase-locked loop circuit tone decoder D2 can receive the light wave with the frequency of 1khz emitted by the emission photocell HL1, the decoding input end of the general phase-locked loop circuit tone decoder D2 decodes, the output end of the general phase-locked loop circuit tone decoder D2 outputs a low level after decoding is successful, the pin1 of the operational comparator D1 outputs a high level, and the pin2 of the operational comparator D1 outputs a low level to be detected by an upper computer.

The emitting frequency of the transmitting phototube HL1 can be changed by adjusting a first resistor R1, a fourth resistor R4 and a first capacitor C1 which are externally connected with a pin5 and a pin6 of the general phase-locked loop circuit tone decoder D2; the capture bandwidth of the phase locked loop can be varied by adjusting a second capacitor C2 external to pin2 of the phase locked loop circuit tone decoder D2. The parameters of reliable operation of the circuit are tested through the adjustment, and the actual measurement shows that when the emission frequency of the emission photoelectric tube HL1 is 1khz, the reliability of the circuit is the best, the waveform of an emission end is shown as figure 5, and the waveform of a receiving end is shown as figure 6, and the good stability and reliability of the circuit are both shown.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.