CN205596094U - Low frequency triggering signal photoelectric converter - Google Patents

Abstract

The utility model discloses a low-frequency trigger signal photoelectric converter, comprising: an electro-optical conversion head connected to an output port of a trigger signal source, and the electro-optic conversion head includes: a current limiting module for generating a current signal from an electric trigger signal output from the output port; The light-emitting device is connected to the current limiting module to generate an optical signal; the photoelectric conversion head is connected to the input port of the triggered device, and the photoelectric conversion head is connected to the electro-optical conversion head through an optical fiber. The photoelectric conversion head includes: The optical receiving device connected to the device is used to generate a trigger signal when receiving an optical signal; the shaping module connected to the optical receiving device is used to shape the trigger signal to output a signal with the same frequency and waveform as the electrical trigger signal and send it to triggered device. The low-frequency trigger signal photoelectric converter enhances the anti-electromagnetic interference capability of the signal, and realizes electrical/high voltage isolation between the signal source and the triggered device.

Description

Low frequency trigger signal photoelectric converter

technical field

The utility model relates to the technical field of electronic information, in particular to a low-frequency trigger signal photoelectric converter.

Background technique

Most of the domestic and foreign research on signal photoelectric/electro-optical conversion is applied in the field of digital communication, and the signal frequency is generally in the GHz order. There are optical transceivers, optical modems, serial port/fiber converters, network port/fiber converters and other products. The relevant circuits and principles are not applicable to the conversion of signals with lower frequencies (kHz and below) commonly used in scientific research or engineering (for example, in the field of particle accelerators). Taking the particle accelerator field as an example, the specific characteristics of the synchronous trigger signal commonly used in this device are that the signal waveform is similar to a square wave, the repetition frequency is lower than 10kHz, and the requirements for the rising edge are very strict, generally on the order of tens of ns, and the jitter (jitter ) is also required to be in the sub-ns (<1ns) level, and the top drop of the waveform is required to be within 5%.

In order to ensure the reliable transmission of the trigger signal in the harsh electromagnetic environment, optical fiber transmission can be selected after photoelectric/electro-optic conversion. In related research, some are to achieve tens of ns delay, and use digital programmable delay line and special delay chip to meet the requirements of synchronous triggering through FPGA or single-chip microcomputer control; some use optical fiber for synchronization The transmission of the trigger signal, but there is no waveform sorting and research on the pulse signal after the electro-optic/photoelectric conversion, and no specific analysis of the rising edge, jitter, delay time, pulse stability and other specific parameters of the signal before and after the conversion. It is difficult to guarantee the repeatability and fidelity before and after the photoelectric/electro-optical conversion of the synchronous trigger signal.

Utility model content

The purpose of this utility model is to solve one of the above-mentioned technical problems at least to a certain extent.

Therefore, the first purpose of the utility model is to provide a low-frequency trigger signal photoelectric converter. The low-frequency trigger signal photoelectric converter enhances the anti-electromagnetic interference capability of the signal, and realizes electrical/high voltage isolation between the signal source and the triggered device.

In order to achieve the above-mentioned purpose, the low-frequency trigger signal photoelectric converter of the first aspect embodiment of the present utility model includes: an electro-optical conversion head connected to the output port of the trigger signal source, and the electro-optical conversion head includes: A current limiting module that generates a current signal from an electrical trigger signal; a light emitting device, the light emitting device is connected to the current limiting module to generate an optical signal; a photoelectric conversion head connected to the input port of the triggered device, the photoelectric conversion The head is connected to the electro-optical conversion head through an optical fiber, and the photoelectric conversion head includes: an optical receiving device connected to the optical sending device, so as to generate a trigger signal when receiving the optical signal; and the optical receiving device The connected shaping module is used to shape the trigger signal to output a signal with the same frequency and waveform as the electrical trigger signal and send it to the triggered device.

The low-frequency trigger signal photoelectric converter of the embodiment of the utility model uses an electro-optic conversion head connected to the output port of the trigger signal source, and the electro-optic conversion head includes a current limiting module and a current limiting module that generates a current signal from the electrical trigger signal output from the output port. The light-emitting device connected to the module generates an optical signal, and then passes through the photoelectric conversion head connected to the input port of the triggered device. The photoelectric conversion head and the electro-optical conversion head are connected through an optical fiber. The photoelectric conversion head includes generating a trigger when receiving an optical signal. The optical receiving device of the signal and the shaping module connected with the optical receiving device can shape the trigger signal and output a signal with the same frequency and waveform as the electrical trigger signal and send it to the triggered device. The low-frequency trigger signal photoelectric converter enhances the signal's anti-electromagnetic Interference capability, enabling electrical/high voltage isolation between the signal source and the device being triggered.

In some examples, the current limiting module is a current limiting resistor.

In some examples, the shaping module is a CMOS Schmitt trigger 6-way inverter.

In some examples, the trigger signal source is connected to the electro-optical conversion head through a coaxial cable BNC.

In some examples, the photoelectric conversion head is connected to the trigger device through a coaxial cable BNC.

In some examples, the electrical trigger signal is TTL level, 3 to 5V.

In some examples, the light-emitting device is HFBR-1414, and the light-receiving device is HFBR-2412.

Additional aspects and advantages of the present invention will be set forth in part in the description which follows, and part will be apparent from the description which follows, or can be learned by practice of the present invention.

Description of drawings

The above and/or additional aspects and advantages of the present utility model will become apparent and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

Fig. 1 is a schematic structural diagram of a low-frequency trigger signal photoelectric converter according to an embodiment of the present invention;

Fig. 2 is an electrical schematic diagram of an electro-optical conversion head according to an embodiment of the present invention;

Fig. 3 is an electrical schematic diagram of a photoelectric conversion head according to an embodiment of the present invention.

detailed description

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

First of all, it should be noted that the low frequency in the present invention is the trigger signal photoelectric converter less than 10kHz. It is used to solve the problem of false triggering or non-triggering caused by electromagnetic interference when the electrical trigger signal is transmitted between the signal source and the triggered device in scientific research or engineering practice. At the same time, it can realize the communication between the signal source and the triggered device Electrical (high voltage) isolation.

Fig. 1 is a schematic structural diagram of a low-frequency trigger signal photoelectric converter according to an embodiment of the present invention.

As shown in FIG. 1 , the low-frequency trigger signal photoelectric converter may include: an electro-optical conversion head 100 and a photoelectric conversion head 200 .

Wherein, the electro-optic conversion head 100 is connected to the output port of the trigger signal source, and the electro-optic conversion head includes: a current limiting module 101 and a light emitting device 102 .

Specifically, the current limiting module 102 generates a current signal from the electrical trigger signal output by the output port. The light-emitting device 102 is connected to the current limiting module 101, and generates a light signal from a current signal.

It should be noted that the current limiting module 101 is a current limiting resistor. The trigger signal source is connected to the electro-optical conversion head 100 through a coaxial cable BNC.

It should also be noted that the electrical trigger signal can be at TTL (Transistor Transistor Logic) level, 3 to 5V. The light emitting device may be HFBR-1414.

In order for those skilled in the art to better understand the working principle of the electro-optic conversion head 100 , it will be described in detail below with reference to FIG. 2 .

As shown in Figure 2, when the electrical trigger signal (TTL level, 3-5V) is input from the coaxial cable, it passes through a current limiting resistor to form a small current signal (tens of mA), so that the light-emitting device 102 HFBR-1414 glows.

In addition, the photoelectric conversion head 200 connected to the input port of the triggered device, the photoelectric conversion head 200 and the electro-optical conversion head 100 are connected through an optical fiber.

Specifically, the photoelectric conversion head 200 includes: an optical receiving device 201 and a shaping module 202 .

Wherein, the light-receiving device 201 connected with the light-emitting device 102 can generate a trigger signal when receiving an optical signal. The shaping module 202 connected to the optical receiving device 201 is used to shape the trigger signal to output a signal with the same frequency and waveform as the electrical trigger signal and send it to the triggered device.

It should be noted that the shaping module 202 may be a CMOS Schmitt trigger 6-way inverter. The photoelectric conversion head 200 is connected to the trigger device through a coaxial cable BNC. The optical receiving device 201 may be HFBR-2412.

In order for those skilled in the art to better understand the working principle of the photoelectric conversion head 200 , it will be described in detail below with reference to FIG. 3 .

As shown in Figure 3, the optical signal is transmitted to the optical receiving device HFBR-2412 through the optical fiber. When there is light input, the conduction output between pin 6 and pin 3/7 is the conduction voltage drop between pin 6 and pin 3/7 (about 0.7V); when there is no light input, pin 6 and pin 3/7 cut off, the output is the power supply voltage. 74HC14 is a CMOS Schmitt trigger 6-way inverter, through which the trigger signal output by the optical receiving device is shaped. There is a hysteresis between the upper and lower threshold voltages of the Schmitt trigger. For example, when the output jumps up at 4V, the lower jump requires the voltage to drop to 3V (lower than 4V). In this way It can effectively shield the interference of noise, and will not cause false triggering due to noise interference.

It can be understood that after the input low-frequency TTL trigger signal passes through the converter, the output signal frequency is the same as the input signal, the signal waveform is basically the same as the input signal, the rising edge of the signal is tens of ns, and the jitter is 1ns to 5ns. The trigger signal is converted from the coaxial cable transmission mode to the optical fiber transmission mode, which enhances the anti-electromagnetic interference ability of the signal, and realizes the electrical (high voltage) isolation between the signal source and the triggered device.

The low-frequency trigger signal photoelectric converter of the embodiment of the utility model uses an electro-optic conversion head connected to the output port of the trigger signal source, and the electro-optic conversion head includes a current limiting module and a current limiting module that generates a current signal from the electrical trigger signal output from the output port. The light-emitting device connected to the module generates an optical signal, and then passes through the photoelectric conversion head connected to the input port of the triggered device. The photoelectric conversion head and the electro-optical conversion head are connected through an optical fiber. The photoelectric conversion head includes generating a trigger when receiving an optical signal. The optical receiving device of the signal and the shaping module connected with the optical receiving device can shape the trigger signal and output a signal with the same frequency and waveform as the electrical trigger signal and send it to the triggered device. The low-frequency trigger signal photoelectric converter enhances the signal's anti-electromagnetic Interference capability, enabling electrical/high voltage isolation between the signal source and the device being triggered.

In the description of the present utility model, it should be understood that the terms "first" and "second" are only used for descriptive purposes, and cannot be interpreted as indicating or implying relative importance or implicitly indicating the number of indicated technical features . Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

In the description of this specification, descriptions with reference to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structures, materials or features are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

Any process or method descriptions in flowcharts or otherwise described herein may be understood to represent modules, segments or portions of code comprising one or more executable instructions for implementing specific logical functions or steps of the process , and the scope of preferred embodiments of the invention includes additional implementations in which functions may be performed out of the order shown or discussed, including substantially concurrently or in reverse order depending on the functions involved, which It should be understood by those skilled in the art to which the embodiments of the present invention belong.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary, and should not be construed as limitations of the present invention, and those of ordinary skill in the art are within the scope of the present invention. Variations, modifications, substitutions and variations can be made to the above-described embodiments.

Claims (7)

1. A low-frequency trigger signal photoelectric converter, characterized in that, comprising: An electro-optical conversion head connected to the output port of the trigger signal source, the electro-optic conversion head includes: A current limiting module that generates a current signal from the electrical trigger signal output by the output port; a light-emitting device, the light-emitting device is connected to the current limiting module to generate an optical signal; A photoelectric conversion head connected to the input port of the triggered device, the photoelectric conversion head is connected to the electro-optical conversion head through an optical fiber, and the photoelectric conversion head includes: an optical receiving device connected to the optical emitting device, to generate a trigger signal when receiving the optical signal; The shaping module connected with the optical receiving device is used to shape the trigger signal to output a signal with the same frequency and waveform as the electrical trigger signal and send it to the triggered device. 2. The low-frequency trigger signal photoelectric converter according to claim 1, wherein the current limiting module is a current limiting resistor. 3. The low-frequency trigger signal photoelectric converter according to claim 1, wherein the shaping module is a CMOS Schmitt trigger 6-way inverter. 4 . The low-frequency trigger signal photoelectric converter according to claim 1 , wherein the trigger signal source is connected to the electro-optical conversion head through a coaxial cable BNC. 5. The low-frequency trigger signal photoelectric converter according to claim 1, wherein the photoelectric conversion head is connected to the trigger device through a coaxial cable BNC. 6. The low-frequency trigger signal photoelectric converter according to claim 1, wherein the electrical trigger signal is at a TTL level, 3 to 5V. 7. The low-frequency trigger signal photoelectric converter according to claim 1, wherein the light-emitting device is HFBR-1414, and the light-receiving device is HFBR-2412.