CN111211839B - Linear optical signal transmission system of electronic transformer - Google Patents
Linear optical signal transmission system of electronic transformer Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
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- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/124—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wired telecommunication networks or data transmission busses
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Abstract
A linearization optical signal transmission system of an electronic transformer belongs to the technical field of electrical engineering measurement. Including high pressure side and low pressure side by transmission fiber connection, its characterized in that: the electro-optical conversion module comprises a feedback control module, the feedback control module controls the transmission light-emitting diode and the feedback light-emitting diode to flow driving currents with the same magnitude, and an optical signal sent by the transmission light-emitting diode is connected with an interface of the transmission optical fiber on the high-voltage side; and a feedback loop is also arranged on the high-voltage side, an optical signal sent by the feedback light-emitting diode is converted into feedback voltage through the feedback loop, and the feedback voltage is connected with the other input end of the feedback control module. In the linearized optical signal transmission system of the electronic transformer, the feedback control module and the feedback loop connected with the feedback control module are arranged, so that the linear representation of the light intensity of the light-emitting diode on the size to be measured at the high-voltage side is realized, the complexity of the system is reduced, and the reliability is higher.
Description
Technical Field
A linearization optical signal transmission system of an electronic transformer belongs to the technical field of electrical engineering measurement.
Background
In the field of electrical measurement, because the optical fiber has the advantages of good insulating property, wide frequency band, interference resistance and the like, electrical information (such as voltage and current) acquired at a high-voltage side is converted into an optical signal and then transmitted to a low-voltage side by using the optical fiber. In the current technical application, there are two main ways for optical fibers to transmit optical signals: digital optical signal mode and analog optical signal mode. Analog optical signaling has the following advantages over digital optical signaling: one is that because A/D sampling is not needed at the high-voltage side, the waveform information to be measured at high voltage can be completely reserved, and the frequency band of the transmittable signal is far wider than the mode of transmitting digital optical signals; and secondly, the A/D link of the high-voltage side is avoided, so that the power consumption of the high-voltage side circuit is greatly reduced, and the power supply design difficulty of the high-voltage side circuit can be reduced.
In the prior art, the solutions for realizing the electrical signal by analog optical signal mainly include the following: (1) the technical scheme disclosed by the chinese patent document with the application number of 201610682973.7 and the patent name of "a photoelectric impulse voltage testing device and method" uses a mode of directly driving a light emitting diode to emit light to measure impulse voltage, and because the frequency band of the impulse voltage reaches dozens of MHz, the mode uses a mode of directly driving the light emitting diode to emit light, and the linear region of the light emitting diode to emit light is utilized to realize the transmission of a signal to be measured. As can be further seen from fig. 6, the method adopts a manner of directly driving the light emitting diode, which is limited by the light emitting mechanism of the light emitting diode, and there is a light emitting dead zone, so that the input current and the output optical power of the light emitting diode have a non-linear relationship, and thus the scheme does not achieve linear transmission of signals.
(2) The technical scheme disclosed by the chinese patent with the application number of 201410379248.3 and the patent name of "analog electrical signal transmission method applied to current transformer" also adopts the design of directly driving the light emitting diode to emit light, and discloses a signal processing method for transmitting a direct current reference signal and a signal to be measured together to correct the influence of attenuation and external factors on the analog optical signal so as to improve the measurement accuracy, but these methods do not consider solving the problem of non-linearity of light emission of the light emitting diode, so that it is difficult to achieve high accuracy.
(3) In the technical method disclosed by chinese patent document No. 201410379248.3 entitled "analog electrical signal transmission method applied to current transformer", No. 201510102017.2 and entitled "signal transmission method for current transformer", a design scheme of directly driving a light emitting diode to emit light is also adopted, and the technical scheme thereof needs to measure and calibrate each set of device in advance except that linear transmission of signals is not realized, and has a large workload, so that it is difficult to achieve high measurement accuracy when it is applied.
(4) In order to solve the nonlinear problem of light emission of the light emitting diode, patent documents with the patent numbers of 201620892474.6, 201610683194.9, 201610678421.9, 201610678235.5, optical signal linear transmission system and active electronic current transformer respectively provide corresponding solutions, and the common points of the solutions are: the method realizes the establishment of the linear transmission channel of the analog optical signal by indirectly driving the light emitting diode to emit light by designing a linear feedback path by using the light emitting diode with the monitoring function or by adding a compensation quantity to a direct current reference signal. The common disadvantage is that the system cost is high due to the need of designing a light emitting diode device with a monitoring function, and the realization difficulty of the system is high due to the mode of increasing the compensation quantity of the direct current reference signal.
Further, in the above patent documents with application No. 201610678421.9 and application No. 201610678235.5, in order to solve the non-linearity problem existing when the led is directly driven to emit light, the led is indirectly driven to emit light through an optical path feedback mechanism, so that the light emission of the led and the linearization of the driving signal are realized. Because the optical device used in the invention is a special device which needs to be specially prepared and cannot be purchased from a common device, and the linearity of the photodiode in the device greatly influences the overall linearity of the method, after the device is prepared, if a certain part in the optical device is damaged in the using process or the linearity of the photodiode in the optical device is poor, the whole device can only be replaced if the part is not replaced independently, so that the application cost and the popularization difficulty of the invention are increased.
In the patent document No. 201610683194.9, although the problem of nonlinearity of led light emission is also solved, the optical splitter is used to split the optical signal of the electro/optical conversion module into two paths, i.e., the optical power signal for monitoring and the optical power signal transmitted to the low voltage side. In addition to the increase of the CPU, the optical splitter and other devices and the increase of the system cost and complexity, the scheme more importantly uses the plastic optical fiber with the inner diameter of mm grade thickness as the transmission of the analog optical signal, and the corresponding plastic optical fiber optical splitter has high technical requirements, high price (close to 1000 yuan RMB) and difficult purchase. Therefore, when the scheme is implemented, the hardware cost is extremely high, and raw materials are difficult to purchase, so that the scheme is difficult to popularize practically and low in practicability.
And in the scheme, the linear light-emitting feedback of the high-voltage side is controlled by a CPU, and the analog-digital conversion and the digital-analog conversion operation to be performed by the CPU in real time are involved. This approach has the following disadvantages: 1) the scheme needs to realize relatively accurate compensation control, the precision of analog-to-digital conversion and digital-to-analog conversion is high, the bit number of A/D and D/A conversion is high, and the common 8-bit A/D, D/A cannot meet the requirement, so that the cost of a CPU or a peripheral A/D, D/A is high. 2) In the method, the CPU needs to synchronously sample two paths of signals, and the price of a synchronous sampling A/D chip is higher. 3) The method relates to least square fitting operation, division operation, size comparison operation and cyclic operation comprising the above operation of a CPU (central processing unit) on a plurality of groups of sampling data points, so that the CPU operation amount is large. Because the measurement requirement of the power system on the current transformer is that each cycle needs to be measured, the method requires that the CPU needs to perform the operation at each cycle, the CPU needs to complete the operation at a high speed, and a common singlechip cannot be sufficient and needs to be realized by using a high-performance singlechip or a DSP processor. This would result in a very high cost and power of the system. 4) The scheme is used for designing an active electronic current transformer, in the design of the active electronic current transformer, the power supply design technology of the high-voltage side is also a technology which is difficult to overcome, the lower the power consumption of a circuit of the high-voltage side is, the better the power consumption is, the power consumption problem of the high-voltage side is not only about the cost but also about the reliability of a system, and the low power consumption requirement is difficult to meet when the scheme is realized.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the linear optical signal transmission system of the electronic transformer overcomes the defects of the prior art, realizes the linear expression of the light emitting intensity of the high-voltage side to be measured through the light emitting diode by arranging the feedback control module and the feedback loop connected with the feedback control module, reduces the complexity of the system and has higher reliability.
The technical scheme adopted by the invention for solving the technical problems is as follows: this electronic transformer's linearization light signal transmission system includes high pressure side and the low pressure side that is connected by transmission fiber, and the high pressure side is provided with signal conditioning module and electro-optical conversion module, and the signal that awaits measuring of sensor output is converted into light signal behind signal conditioning module and the electro-optical conversion module, and light signal conveys to the low pressure side by the high pressure side through transmission fiber to by the photoelectric conversion module reduction of low pressure side for the signal of telecommunication, its characterized in that: the electro-optical conversion module comprises a feedback control module, the output end of the signal conditioning circuit is connected with the input end of the feedback control module, the feedback control module controls the transmission light-emitting diode and the feedback light-emitting diode to flow driving currents with the same magnitude, and an optical signal sent by the transmission light-emitting diode is connected with an interface of the transmission optical fiber on the high-voltage side; and a feedback loop is also arranged on the high-voltage side, and an optical signal sent by the feedback light-emitting diode is connected with the other input end of the feedback control module through the feedback loop.
Preferably, the output end of the feedback control module is provided with a constant current driving module, the output end of the feedback control module is connected with the input end of the constant current driving module, and the constant current driving module is controlled to output driving currents with the same magnitude to the transmission light emitting diode and the feedback light emitting diode.
Preferably, the transmission light emitting diode and the feedback light emitting diode are connected in series.
Preferably, the feedback loop comprises a feedback optical fiber, the feedback light emitting diode is connected with one end of the feedback optical fiber, the other end of the feedback optical fiber is connected with a feedback photodiode, and a current signal output by the feedback photodiode is connected with the feedback control module through an electric signal conversion module at a high-voltage side.
Preferably, the electro-optical conversion module includes a transmission photodiode and an electrical signal conversion module located at a low voltage side, an interface of the transmission fiber located at the low voltage side is connected to the transmission photodiode, and an output end of the photodiode is connected to an input end of the electrical signal conversion module.
Preferably, the feedback control module is an operational amplifier, and the output end of the signal conditioning circuit and the output end of the feedback loop are respectively connected with two input ends of the operational amplifier.
Preferably, the signal conditioning circuit includes a reference voltage generating module for generating a reference signal, and a signal mixing module for mixing the reference signal with a signal output by the current transformer.
Compared with the prior art, the invention has the beneficial effects that:
1. in the linearized optical signal transmission system of the electronic transformer, the feedback control module and the feedback loop connected with the feedback control module are arranged, so that the linear representation of the light intensity of the light-emitting diode on the size to be measured at the high-voltage side is realized, the complexity of the system is reduced, and the reliability is higher.
2. In the linearized optical signal transmission system of the electronic transformer, the linearity of light emission of the light-emitting diode at the high-voltage side is not required, and only two light-emitting diodes with the same or similar light-emitting characteristics are used, and then the light-emitting power of the light-emitting diode is monitored by using a high-linearity photodiode. Therefore, the method greatly reduces the requirements on optical devices, two light-emitting diodes with the same or similar light-emitting characteristics are easy to find in practice, and the photodiode with high linearity belongs to the conventional photodiode product for communication. The engineering practicability of the method is higher.
3. In the linearized optical signal transmission system of the electronic transformer, the whole linearized electro-optical conversion module uses feedback control but does not use a CPU (central processing unit), so that the circuit implementation of the method is simpler, the cost is lower and the reliability is higher.
4. Because the feedback light-emitting diode and the transmission light-emitting diode are both positioned in the high-voltage side electro-optical conversion circuit and are connected in series, the influence of environmental factors such as temperature on the two light-emitting diodes is the same, the change of the light-emitting characteristics of the LED caused by the environment is counteracted, and the system precision is ensured.
5. The feedback control module is realized by using an operational amplifier, and the control of the current flowing through the light-emitting diode is automatically realized by utilizing the virtual break characteristic of the operational amplifier and the virtual short characteristic in a negative feedback state, so that the aim of enabling a signal to be detected and the light-emitting power of the transmission light-emitting diode to be in a linear relation is fulfilled.
Drawings
Fig. 1 is a schematic block diagram of a linearized optical signal transmission system of an electronic transformer.
Fig. 2 is a schematic block diagram of a photoelectric conversion module of a linearized optical signal transmission system of an electronic transformer according to embodiment 1.
Fig. 3 is a schematic block diagram of an electro-optical conversion module of a linearized optical signal transmission system of an electronic transformer in embodiment 1.
Fig. 4 is a schematic diagram of a high-voltage side circuit of a linearized optical signal transmission system of an electronic transformer in embodiment 1.
Fig. 5 is a schematic block diagram of a photoelectric conversion module of a linearized optical signal transmission system of an electronic transformer according to embodiment 2.
Fig. 6 is a graph showing the relationship between the input current and the output light power of the prior art direct-drive led.
Detailed Description
FIGS. 1 to 4 are preferred embodiments of the present invention, and the present invention will be further described with reference to FIGS. 1 to 5.
Example 1:
as shown in fig. 1, a linearized optical signal transmission system of an electronic transformer includes a primary sensor, a signal conditioning circuit, an electrical-to-optical conversion module, a transmission fiber, and an optical-to-electrical conversion module. The primary sensor is connected with the input end of the signal conditioning circuit, the output end of the signal conditioning circuit is connected with the input end of the electro-optical conversion module, the output end of the electro-optical conversion module is connected with the input end of the transmission optical fiber (the connecting end of the transmission optical fiber on the high-voltage side), the output end of the transmission optical fiber (the connecting end of the transmission optical fiber on the low-voltage side) is connected with the input end of the photoelectric conversion module, and the output end of the photoelectric conversion module outputs signals.
The primary sensor collects electric signals of the power transmission line, outputs the electric signals through the output end of the primary sensor and sends the electric signals to the signal conditioning circuit, and the signal conditioning circuit comprises a reference voltage generating module used for generating reference signals and a signal mixing module used for mixing the reference signals with signals output by the current transformer. The electric signal output by the signal conditioning circuit is sent into the electro-optical conversion module, the electro-optical conversion module is driven to emit an optical signal, the optical signal is transmitted to the low-voltage side through the transmission optical fiber, the optical signal enters the electro-optical conversion module to be converted to obtain the electric signal when being transmitted to the low-voltage side, and further the electric signal data of the power transmission line is obtained on the low-voltage side according to the obtained electric signal.
The linearization optical signal transmission system of the electronic transformer can be used for the design of the active electronic transformer. For an electronic voltage transformer, a primary sensor is a small voltage signal divided by a resistor or a capacitor; in the electronic current transformer, the primary sensor is a measuring sensor head LPCT or a protective sensor head rogowski coil.
As shown in fig. 2, the electro-optical conversion module includes a feedback control module, a constant current driving module, a transmission light emitting diode, a feedback optical fiber, and a feedback photodiode. The signal output by the signal conditioning module is sent to the input end of the feedback control module, the output end of the feedback control module is connected with the input end of the constant current driving module, the feedback control module controls the constant current driving module to output a driving current for driving the light emitting diode to emit light, the driving current flows through the transmission light emitting diode and the feedback light emitting diode which are connected in series, and the transmission light emitting diode and the feedback light emitting diode are connected in series, so that the currents flowing through the transmission light emitting diode and the feedback light emitting diode are the same in magnitude.
The optical signal emitted by the transmission light-emitting diode is accessed to the interface of the transmission optical fiber positioned at the high-voltage side and is transmitted to the low-voltage side; the light signal sent by the feedback light-emitting diode is connected to one end of the feedback optical fiber, the other end of the feedback optical fiber is connected to the feedback photodiode, the feedback photodiode receives the excitation of the light signal and generates a current signal, and the current signal is sent to the other input end of the feedback control module.
As shown in fig. 3, the photoelectric conversion module located at the low voltage side includes a transmission photodiode and an electrical signal conversion module located at the low voltage side, the transmission photodiode is accessed after an optical signal sent by the transmission light emitting diode is transmitted to the low voltage side through a transmission optical fiber, the transmission photodiode generates a current signal after receiving the excitation of the optical signal, and the current signal is converted into a final voltage signal through the electrical signal conversion module located at the low voltage side and is output.
As shown in FIG. 4, the voltage signal at the output terminal of the signal conditioning circuitU IN Series resistanceR 1 Then simultaneously connecting the capacitorsC 1 One end of (A)、PhotodiodePD 1 Cathode and integrated operational amplifier of (1)U 1 Non-inverting input terminal of, the photodiodePD 1 Is connected to an operational amplifierU 1 And to ground. Capacitor with a capacitor elementC 1 One end of the first connecting unit is connected with the integrated operational amplifierU 1 To the output terminal of (a).
Integrated operational amplifierU 1 Output end of (1) series resistorR 2 Then connecting triodeQ 1 Base electrode of, power sourceVccSeries resistanceR 3 Connecting triodeQ 1 Emitter, triodeQ 1 Collector of the LED is connected in series with the LEDLED1~LED2And (4) grounding.
Light emitting diodeLED1~LED2Corresponding to the transmission LED and the feedback LED, and the resistorR 3 And triodeQ 1 The constant current driving module corresponds to the constant current driving module. PhotodiodePD 1 Corresponding to the feedback photodiode, the integrated operational amplifierU 1 The feedback control module corresponds to the feedback control module. Light emitting diodeLED2Driving a photodiodePD 1 A current signal is generated.
The specific working process and working principle are as follows:
the feedback control module is realized by an operational amplifier, and the output end of the signal conditioning circuit outputs a voltage signalU IN One input terminal of the operational amplifier and the output terminal of the operational amplifierThe input end of a constant current driving module (which can be realized by a constant current source circuit) is connected to drive the constant current driving module to output a driving current I f Driving current I f The light-emitting diodes with similar light-emitting characteristics are selected as a transmission light-emitting diode and a feedback light-emitting diode respectively when the light-emitting diodes are connected in series, so that when a driving current I is applied f Transmitting the luminous power of the light signal emitted by the light emitting diode when the current flows throughP opt1 And feeding back the luminous power of the optical signal emitted by the light-emitting diodeP opt2 Are identical, i.e. thatP opt1 =P opt2 。
Because the attenuation of the optical fiber to the output light power of the light-emitting diode is linear attenuation, the luminous power of the light signal emitted by the light-emitting diode is transmittedP opt1 Transmitted to the low-voltage side through the transmission optical fiber, and the luminous power attenuated in the transmission process is changed intoP ’ opt1 And is made ofP’ opt1 =a 1 c 1 P opt1 In the formulaa 1 In order to provide the attenuation coefficient of the transmission fiber itself,c 1 the coupling loss coefficient of the transmission optical fiber, the transmission light-emitting diode and the photodiode. Luminous powerP’ opt1 Illumination on a transmitting photodiode generates a current signali ph1 And is andi ph1 =r 1 P’ opt1 in the formular 1 To transfer the photo-responsivity of the photodiode. The low-voltage side electric signal conversion module feeds back the current signal output by the photodiodei ph1 Conversion to feedback voltageUout。
On the high-voltage side, the luminous power of the light signal emitted by the light-emitting diode is fed backP opt2 The luminous power after being attenuated by the transmission of the feedback optical fiber is changed intoP' opt2 And is andP' opt2 =a 2 c 2 P opt2 in the formulaa 2 In order to feed back the attenuation coefficient of the fiber itself,c 2 the coupling loss coefficient of the feedback optical fiber, the feedback light-emitting diode and the photodiode. Luminous power output by feedback optical fiberP' opt2 Illumination on a feedback photodiode generates a current signali ph2 And is andi ph2 =r 2 P' opt2 in the formular 2 To feedback the photo-responsivity of the photodiode.
Since the photodiodePD 1 Between the two inputs of the integrated operational amplifier, a photodiode according to the "virtual short" characteristic of the integrated operational amplifierPD 1 The potentials at the two ends are zero; according to the 'virtual break' characteristic of the integrated operational amplifier, the current does not flow into the input end of the operational amplifier, and therefore flows through the resistorR 1 Current of andi ph2 if the current is equal, the constant current driving module maintains the original output currentI f . Due to the fact thati ph2 =r 2 P' opt2 Thus the voltage signalU IN And feedback of output light power of light emitting diodeP opt2 The relationship of (1) is:U IN =U' IN =a 2 c 2 r 2 R 1 P opt2 =AP opt2 in the formulaAShow thatU IN -P opt2 The conversion coefficient of (a) is,R 1 indicating resistanceR 1 Is measured. Since the transmission light emitting diode and the feedback light emitting diode are connected in series and have similar light emitting characteristics, the transmission light emitting diode and the feedback light emitting diode have similar light emitting characteristicsU IN =AP opt2 =AP opt1 Thus, the feedback light emitting diode and the feedback photodiode are utilized to realize two light emitting diodes and a voltage signalU IN The linear relationship between them, i.e. the linear electro-optical conversion part in fig. 2 is realized.
If it isU' IN <U IN The feedback control module controls the constant current driving module to output the driving currentI f Increasing, feeding back the optical power output by the light emitting diodeP opt2 Will become larger, resulting in a feedback of the current output by the photodiodei ph2 Is enlarged and then makesU' IN Increase untilU' IN AndU IN are equal. If it isU' IN >U IN The feedback control module controls the constant current driving module to output the driving currentI f Reducing, feeding back the optical power output by the light emitting diodeP opt2 Will be reduced resulting in a current output by the feedback photodiodei ph2 Is reduced and then madeU' IN Is reduced untilU' IN AndU IN are equal.
Therefore, the voltage signal is realized by utilizing the linear optical signal transmission system of the electronic transformerU IN And transmitting the luminous power of the light emitting diodeP opt1 A linear relationship between the two; the analog optical signal output by the transmission light emitting diode is transmitted to the photoelectric conversion module at the low voltage side through the transmission optical fiber to obtain a voltage signalU IN Linear mapping signal on low voltage sideU OUT 。
Example 2:
this example differs from example 1 in that: in the embodiment, the voltage signal is realized by using the difference of the voltage signals at two ends of the input feedback control moduleU IN And transmitting the luminous power of the light emitting diodeP opt1 A linear relationship between the two.
As shown in fig. 5, an electrical signal conversion module is disposed in the feedback loop, the electrical signal conversion module is located between the feedback photodiode and the feedback control module, the feedback photodiode receives the excitation of the optical signal and generates a current signal, and the current signal is converted into a feedback voltage by the electrical signal conversion module on the high voltage side and sent to the other input end of the feedback control module.
The specific working process and working principle are as follows:
as can be seen from the description of the embodiments, the driving current I f Transmitting luminous power of light signal emitted by the light emitting diode when the light signal flows through the transmission light emitting diode and the feedback light emitting diodeP opt1 And feeding back the luminous power of the optical signal emitted by the light-emitting diodeP opt2 Are identical, i.e. thatP opt1 =P opt2 。
Luminous power output by feedback optical fiberP' opt2 Illumination on a feedback photodiode generates a current signali ph2 And is andi ph2 =r 2 P' opt2 in the formular 2 To feedback the photo-responsivity of the photodiode. The high-voltage side electric signal conversion module feeds back the current signal output by the photodiodei ph2 Conversion to a feedback voltageU' IN ，U' IN =Ri ph2 In the formulaRIs the conversion coefficient of the high-voltage side electric signal conversion module, if the high-voltage side electric signal conversion module uses the resistor to realize conversion,Rthe resistance value of the resistor is indicated.
Voltage signal output by signal conditioning circuitU IN And a feedback voltageU' IN Respectively inputting two input ends of the feedback control module:
(1) if it isU IN And withU' IN If they are equal, the constant current driving module maintains the original output currentI f Thus voltage signalU IN And feedback of output light power of light emitting diodeP opt2 The relationship of (1) is:U IN =U' IN =a 2 c 2 r 2 RP opt2 =AP opt2 in the formulaAShow thatU IN -P opt2 Since the transmission led and the feedback led are connected in series and have similar light emitting characteristics, the conversion coefficient of (2) is improvedU IN =AP opt2 =AP opt1 Thereby realizing a voltage signalU IN And a linear relation with the transmission light emitting diode, namely, a linear electro-optical conversion part in fig. 2 is realized.
(2) If it isU' IN <U IN The feedback control module controls the constant current driving module to output the driving currentI f Increasing, feeding back the optical power output by the light emitting diodeP opt2 Will become larger, resulting in a feedback of the current output by the photodiodei ph2 Is enlarged and then makesU' IN Increase until it isU' IN AndU IN and (3) equaling, and finally realizing the linear light emission of the light-emitting diode as described in (1).
(3) If it isU' IN >U IN The feedback control module controls the constant current driving module to output the driving currentI f Reducing, feeding back the optical power output by the light emitting diodeP opt2 Will be reduced resulting in a current output by the feedback photodiodei ph2 Is reduced and then madeU' IN Is reduced untilU' IN And withU IN And (3) equaling, and finally realizing the linear light emission of the light-emitting diode as described in (1).
The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention will still fall within the protection scope of the technical solution of the present invention.
Claims (5)
1. The utility model provides an electronic transformer's linearization light signal transmission system, includes high-pressure side and the low pressure side that is connected by transmission fiber, and the high-pressure side is provided with signal conditioning module and electro-optical conversion module, and the signal that awaits measuring of sensor output is converted into light signal behind signal conditioning module and the electro-optical conversion module, and light signal conveys to the low pressure side by the high-pressure side through transmission fiber to by the photoelectric conversion module reduction of low pressure side for the signal of telecommunication, its characterized in that: the electro-optical conversion module comprises a feedback control module, the output end of the signal conditioning circuit is connected with the input end of the feedback control module, the feedback control module controls the transmission light-emitting diode and the feedback light-emitting diode to flow driving currents with the same magnitude, and an optical signal sent by the transmission light-emitting diode is connected with an interface of the transmission optical fiber on the high-voltage side; a feedback loop is also arranged on the high-voltage side, and an optical signal sent by the feedback light-emitting diode is connected with the other input end of the feedback control module through the feedback loop;
the transmission light emitting diode and the feedback light emitting diode are connected in series;
the feedback loop comprises a feedback optical fiber, the feedback light emitting diode is connected with one end of the feedback optical fiber, the other end of the feedback optical fiber is connected with a feedback photodiode, and a current signal output by the feedback photodiode is connected with the feedback control module through an electric signal conversion module at a high-voltage side.
2. The linearized optical signal transmission system of an electronic transformer according to claim 1, characterized in that: the output end of the feedback control module is provided with a constant current driving module, the output end of the feedback control module is connected with the input end of the constant current driving module, and the constant current driving module is controlled to output driving currents with the same magnitude to the transmission light emitting diode and the feedback light emitting diode.
3. The linearized optical signal transmission system of an electronic transformer according to claim 1, characterized in that: the electro-optical conversion module comprises a transmission photodiode and an electric signal conversion module positioned on a low-voltage side, an interface of the transmission optical fiber positioned on the low-voltage side is connected with the transmission photodiode, and the output end of the photodiode is connected with the input end of the electric signal conversion module.
4. The linearized optical signal transmission system of an electronic transformer according to claim 1, characterized in that: the feedback control module is an operational amplifier, and the output end of the signal conditioning circuit and the output end of the feedback loop are respectively connected with two input ends of the operational amplifier.
5. The linearized optical signal transmission system of an electronic transformer according to claim 1 or 4, characterized in that: the signal conditioning circuit comprises a reference voltage generating module for generating a reference signal and a signal mixing module for mixing the reference signal and a signal output by the current transformer.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106253979A (en) * | 2016-08-17 | 2016-12-21 | 山东理工大学 | A kind of optical signal linear transmission system and Active Electronic Current Transformer |
| CN106373380A (en) * | 2016-08-17 | 2017-02-01 | 山东理工大学 | Electronic current transformer signal linear transmission device and method |
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| CN106253979A (en) * | 2016-08-17 | 2016-12-21 | 山东理工大学 | A kind of optical signal linear transmission system and Active Electronic Current Transformer |
| CN106373380A (en) * | 2016-08-17 | 2017-02-01 | 山东理工大学 | Electronic current transformer signal linear transmission device and method |
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