CN219351706U - Photoelectric isolation transmission circuit for high-potential platform analog signals - Google Patents
Photoelectric isolation transmission circuit for high-potential platform analog signals Download PDFInfo
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- CN219351706U CN219351706U CN202320411419.0U CN202320411419U CN219351706U CN 219351706 U CN219351706 U CN 219351706U CN 202320411419 U CN202320411419 U CN 202320411419U CN 219351706 U CN219351706 U CN 219351706U
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Abstract
The utility model discloses a photoelectric isolation transmission circuit for an analog signal of a high-potential platform, and relates to the technical field of signal circuit design. The utility model comprises a V/F conversion module, a photoelectric isolation module, a static working point setting module and an F/V conversion module, wherein: the output end of the V/F conversion module is coupled with the input end of the photoelectric isolation module; the output end of the photoelectric isolation module is coupled with the input end of the F/V conversion module; the output end of the F/V conversion module is coupled with the input end of the static working point setting module, and can adopt a differential idea to isolate differential signals in two paths so as to overcome temperature drift and common mode noise, thereby enhancing the anti-interference capability and enlarging the transmission distance; the signal after isolation is obtained by utilizing negative feedback, the photosensitive current is stabilized, the frequency band of the optical coupler is widened, the nonlinear distortion problem of the light source is well solved, and the optical coupler has high noise suppression ratio in transmission.
Description
Technical Field
The utility model belongs to the technical field of signal circuit design, and particularly relates to a photoelectric isolation transmission circuit for an analog signal of a high-potential platform.
Background
In the project of "fusion reactor host computer key system integrated research facility (CRASFT)", the highest running voltage of the accelerator of the negative ion source of the sexual beam injector reaches direct current-400 kV, an auxiliary power supply system and a data measuring system of the negative ion source are required to be placed on a high-potential platform with the ground isolation voltage reaching more than direct current 400kV, and all sampling data on the platform must be transmitted into a ground control room in a safe and reliable photoelectric isolation mode.
Therefore, a communication link system based on multimode optical fibers needs to be designed and developed to establish a data sampling detection system, wherein an analog signal photoelectric isolation transmission circuit consisting of a high-speed DAC chip and a high-speed VF-FV conversion module is a core component of the system, and the sampling and conversion rate of the detection system in operation is directly determined. The photoelectric coupling isolation circuit uses light as a medium to realize transmission of electric signals, and has no direct electrical connection between input and output, so that the photoelectric coupling isolation circuit has strong isolation function, and has the characteristics of small volume, simple structure and the like, thereby being widely applied to large-scale industrial detection systems.
The optical coupler is relatively easy to realize for transmitting digital signals, and only the problem of transmission rate is generally considered; however, when analog signals are transmitted, the analog signals are limited by the characteristics of the optical coupler, and the common problems are that the performance of frequency response, linearity, signal input range and noise floor cannot be well coordinated; in practical applications, when isolating analog signals, a/D or V/F is generally performed first, and then digital quantity isolation is performed, and D/a or F/V is performed at the signal receiving end to recover analog signals. This clearly adds significant complexity to the design and increases costs.
Therefore, in order to solve the above-mentioned technical problems, it is necessary to design an analog signal photoelectric isolation transmission circuit running on a high-potential platform, which combines the performance of linearity, frequency response, input range, noise and other aspects, simplifies the design and reduces the cost of production and manufacture.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art and provide a photoelectric isolation transmission circuit for high-potential platform analog signals, which can overcome the problems or at least partially solve the problems.
In order to solve the technical problems, the utility model adopts the basic conception of the technical scheme that: the photoelectric isolation transmission circuit for the high-potential platform analog signals comprises a V/F conversion module, a photoelectric isolation module, a static working point setting module and an F/V conversion module, wherein:
the output end of the V/F conversion module is coupled with the input end of the photoelectric isolation module;
the output end of the photoelectric isolation module is coupled with the input end of the F/V conversion module;
the output end of the F/V conversion module is coupled with the input end of the static working point setting module.
Preferably, the V/F conversion module is configured to convert an input voltage into a pulse frequency.
Further, the V/F conversion module includes therein a synchronous voltage-to-frequency conversion module, which is a core element within the V/F conversion module, providing a typical nonlinearity of 0.002% at an output frequency of 100 kHz.
Furthermore, the synchronous voltage-frequency conversion module comprises a voltage input module, wherein the voltage input module is formed by connecting a smaller adjustable resistor and a larger fixed resistor in series, so that the input resistance can be finely adjusted, and the requirement of the synchronous voltage-frequency conversion module on input current is met.
Preferably, the optoelectronic isolation module comprises a high-performance optical fiber emission module, the high-performance optical fiber emission module is a 820-nanometer micro link series element, and the voltage signal after isolation is obtained from a feedback resistor.
Further, the photoelectric isolation module further comprises a proportional amplification module, the proportional amplification module is composed of an operational amplifier, the proportional amplification module amplifies input signals of all paths and sends the amplified input signals to the isolation stage, the signal-to-noise ratio of output voltage is improved, and noise generated by the photoelectric coupling isolation stage is reduced.
Preferably, the static working point setting module comprises a voltage follower formed by an operational amplifier integrated operational amplifier module, a potentiometer module and a resistor module, the static working point setting module enables signals to fall in a linear working area of the optocoupler, and the static working point setting module obtains proper static working point voltage through adjusting the potentiometer module, so that reasonable static working point driving current is obtained.
Further, the integrated operational amplifier module adopts SOIC package.
Preferably, the F/V conversion module is configured to complete conversion from the pulse frequency to the output voltage, where the input signal frequency is first changed into a negative pulse by the differentiating circuit, then added to the input terminal of the comparator, and the falling edge is used to trigger the monostable circuit to enter a new measurement period, and the magnitude of the converted dc voltage is proportional to the input frequency.
Further, a variable resistance module is installed in the F/V conversion module, and the variable resistance module can perform full-scale calibration and zero-degree calibration.
After the technical scheme is adopted, compared with the prior art, the utility model has the following beneficial effects: according to the photoelectric isolation transmission circuit for the high-potential platform analog signals, the differential thought is adopted, and the differential signals are separated into two paths to overcome temperature drift and common mode noise, so that the anti-interference capability is enhanced, and the transmission distance is increased; meanwhile, the signal after isolation is obtained by negative feedback, the photosensitive current is stabilized, the frequency band of the optical coupler is widened, the problem of nonlinear distortion of the light source is well solved, and the optical coupler has high noise suppression ratio in transmission. The circuit has simple structure and lower cost, and has strong popularization value for high-speed accurate isolation of analog signals.
The following describes the embodiments of the present utility model in further detail with reference to the accompanying drawings.
Drawings
In the drawings:
FIG. 1 is a schematic diagram of a V/F conversion circuit of the present utility model;
FIG. 2 is a schematic diagram of a photo-isolation circuit of the present utility model;
FIG. 3 is a schematic diagram of a static operating point setting circuit of the present utility model;
FIG. 4 is a schematic diagram of an F/V conversion circuit of the present utility model;
fig. 5 is a schematic flow chart of the present utility model.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions in the embodiments will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present utility model, and the following embodiments are used to illustrate the present utility model, but are not intended to limit the scope of the present utility model.
Example 1:
referring to fig. 5, a photoelectric isolation transmission circuit for a high-potential platform analog signal includes a V/F conversion module, a photoelectric isolation module, a static operating point setting module, and an F/V conversion module, where:
the output end of the V/F conversion module is coupled with the input end of the photoelectric isolation module;
the output end of the photoelectric isolation module is coupled with the input end of the F/V conversion module;
the output end of the F/V conversion module is coupled with the input end of the static working point setting module.
The V/F conversion module is used for converting input voltage into pulse frequency, the V/F conversion module comprises a synchronous voltage-frequency conversion module, the synchronous voltage-frequency conversion module is a core element in the V/F conversion module and provides 0.002% of typical nonlinearity under the output frequency of 100kHz, the synchronous voltage-frequency conversion module comprises a voltage input module, the voltage input module is formed by serially connecting a smaller adjustable resistor with a larger fixed resistor, the input resistance value can be finely adjusted, and the requirement of the synchronous voltage-frequency conversion module on input current is met.
The photoelectric isolation module comprises a high-performance optical fiber emission module, wherein the high-performance optical fiber emission module is a 820-nanometer micro link series element, voltage signals after isolation are obtained from a feedback resistor, the photoelectric isolation module further comprises a proportional amplification module, the proportional amplification module is composed of an operational amplifier, the proportional amplification module amplifies input signals of all paths and sends the amplified signals to an isolation stage, the signal-to-noise ratio of output voltage is improved, and noise generated by the photoelectric coupling isolation stage is reduced.
The static working point setting module comprises a voltage follower formed by an operational amplifier integrated operational amplifier module, a potentiometer module and a resistor module, the static working point setting module enables signals to fall in a linear working area of an optocoupler, the static working point setting module obtains proper static working point voltage through adjusting the potentiometer module to obtain reasonable static working point driving current, and the integrated operational amplifier module adopts SOIC packaging.
The F/V conversion module is used for completing the conversion from pulse frequency to output voltage, the frequency of an input signal is changed into negative pulse through the differential circuit, then the negative pulse is added to the input end of the comparator, the monostable circuit is triggered by the falling edge to enter a new measurement period, the size of the converted direct current voltage is in direct proportion to the input frequency, the variable resistance module is arranged in the F/V conversion module, and the variable resistance module can perform full-scale calibration and zero-degree calibration.
Example 2:
as shown in fig. 1, the V/F conversion module may function as a VF conversion circuit: the V/F conversion section performs conversion of the input voltage to the pulse frequency. The core element required for conversion is AD652AQ. The AD652 synchronous voltage-to-frequency converter (SVFC) is a core element for performing precision analog-to-digital conversion, providing a typical nonlinearity of 0.002% (max 0.005%) at an output frequency of 100kHz, with a more stable, linear transfer function than other devices of the same type. The voltage input part is formed by connecting a smaller adjustable resistor and a larger fixed resistor in series so as to finely adjust the input resistance value and meet the requirement of AD652AQ on input current.
As shown in fig. 2, the optoelectronic isolation module may function as an optoelectronic isolation circuit: the optocoupler adopts HFBR-1414TZ. HFBR-1414TZ is a high performance fiber optic transmitter manufactured by AVAGO corporation as one of the series of 820 nm micro-link components that is often designed to provide cost-effective high performance optical fibers for providing high performance fiber optic communication links to information systems and industries. In order to stabilize the current and make the bandwidth of the circuit as large as possible, the voltage signal after isolation is obtained from the feedback resistor, and the larger the resistance value is, the larger the amplitude of the obtained signal is. In order to make the noise floor as small as possible, the feedback resistance must be large enough to obtain a sufficiently large useful signal, considering that the noise will be amplified together with the useful signal, (2) the amplification of the preceding stage circuit will not be too large, and the noise amplitude will be controlled within a certain range. Meanwhile, in order to improve the signal-to-noise ratio of the output voltage and reduce noise generated by the photoelectric coupling isolation stage, a proportional amplifier formed by an operational amplifier is added before input signals of all paths in the figure, and the input signals are amplified and then sent to the isolation stage. In this way, the input load capacity can also be improved.
As shown in fig. 3, the static operating point setting module may function as a static operating point setting circuit: as described above, the optocoupler has nonlinear transmission characteristics. When analog signals are transmitted, static working points must be reasonably set, so that the signals fall into a linear working area of the optocoupler as much as possible. The static working point setting circuit is composed of an operational amplifier OP07CSZ, a potentiometer and a resistor to form a voltage follower. The integrated operational amplifier with the model OP07CSZ adopts SOIC packaging, can keep good linearity and gain precision even under high closed loop gain, has good stability of gain variation with time or temperature, and is hardly influenced by external interference. Based on the characteristics, proper static working point voltage can be obtained by adjusting the potentiometer in the static working point voltage, and then reasonable static working point driving current is obtained.
As shown in fig. 4, the F/V conversion module may function as an FV conversion circuit: the F/V conversion section performs conversion of the pulse frequency into an output voltage. The input signal frequency is changed into negative pulse (positive pulse is short-circuited) through the differentiating circuit, then the negative pulse is added to the input end of the comparator, the monostable circuit is triggered to enter a new measuring period by the falling edge, and the converted direct-current voltage is proportional to the input frequency. The purpose of the variable resistor in the circuit is to perform full-scale calibration and zero-scale calibration.
The utility model converts the analog input small signal into the frequency pulse signal through V/F after modulation, then drives the LED to convert the electric signal into the optical signal through the triode, then the optical signal is amplified into the electric signal through the operational amplifier after entering the photoelectric receiving diode through the transmission of the optical fiber, and finally the original analog small signal is recovered by the F/V conversion circuit and the demodulation circuit, thereby realizing the high-precision transmission.
The present utility model is not limited to the preferred embodiments, but is not limited to the preferred embodiments described above, and any person skilled in the art will appreciate that the present utility model is not limited to the embodiments described above.
Claims (10)
1. A photoelectric isolation transmission circuit for high potential platform analog signals is characterized in that: the device comprises a V/F conversion module, a photoelectric isolation module, a static working point setting module and an F/V conversion module, wherein:
the output end of the V/F conversion module is coupled with the input end of the photoelectric isolation module;
the output end of the photoelectric isolation module is coupled with the input end of the F/V conversion module;
the output end of the F/V conversion module is coupled with the input end of the static working point setting module.
2. The high-potential platform analog signal photoelectric isolation transmission circuit according to claim 1, wherein: the V/F conversion module is used for converting the input voltage into the pulse frequency.
3. The high-potential platform analog signal photoelectric isolation transmission circuit according to claim 2, wherein: the V/F conversion module includes therein a synchronous voltage-to-frequency conversion module, which is a core element within the V/F conversion module, providing a typical nonlinearity of 0.002% at an output frequency of 100 kHz.
4. A high-potential platform analog signal photoelectric isolation transmission circuit according to claim 3, wherein: the synchronous voltage-frequency conversion module comprises a voltage input module, wherein the voltage input module is formed by connecting a smaller adjustable resistor and a larger fixed resistor in series, so that the input resistance can be finely adjusted, and the requirement of the synchronous voltage-frequency conversion module on input current is met.
5. The high-potential platform analog signal photoelectric isolation transmission circuit according to claim 1, wherein: the photoelectric isolation module comprises a high-performance optical fiber emission module, wherein the high-performance optical fiber emission module is a 820-nanometer micro link series element, and the voltage signal after isolation is obtained from a feedback resistor.
6. The high-potential platform analog signal photoelectric isolation transmission circuit according to claim 5, wherein: the photoelectric isolation module is characterized in that the photoelectric isolation module further comprises a proportional amplification module, the proportional amplification module is composed of an operational amplifier, the proportional amplification module amplifies input signals of all paths and sends the amplified input signals to the isolation stage, the signal-to-noise ratio of output voltage is improved, and noise generated by the photoelectric coupling isolation stage is reduced.
7. The high-potential platform analog signal photoelectric isolation transmission circuit according to claim 1, wherein: the static working point setting module comprises a voltage follower formed by an operational amplifier integrated operational amplifier module, a potentiometer module and a resistor module, the static working point setting module enables signals to fall in a linear working area of an optocoupler, and the static working point setting module obtains proper static working point voltage through adjusting the potentiometer module to obtain reasonable static working point driving current.
8. The high-potential platform analog signal photoelectric isolation transmission circuit according to claim 7, wherein: the integrated operational amplifier module adopts SOIC packaging.
9. The high-potential platform analog signal photoelectric isolation transmission circuit according to claim 1, wherein: the F/V conversion module is used for completing the conversion from pulse frequency to output voltage, the frequency of an input signal is changed into negative pulse through the differential circuit, the negative pulse is added to the input end of the comparator, the monostable circuit is triggered to enter a new measurement period by the falling edge, and the size of the converted direct current voltage is in direct proportion to the input frequency.
10. The high-potential platform analog signal photoelectric isolation transmission circuit according to claim 9, wherein: and the F/V conversion module is internally provided with a variable resistance module, and the variable resistance module can perform full-scale calibration and zero-degree calibration.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320411419.0U CN219351706U (en) | 2023-03-07 | 2023-03-07 | Photoelectric isolation transmission circuit for high-potential platform analog signals |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320411419.0U CN219351706U (en) | 2023-03-07 | 2023-03-07 | Photoelectric isolation transmission circuit for high-potential platform analog signals |
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| CN202320411419.0U Active CN219351706U (en) | 2023-03-07 | 2023-03-07 | Photoelectric isolation transmission circuit for high-potential platform analog signals |
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