CN108490483B - Signal transmission device and system - Google Patents
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- CN108490483B CN108490483B CN201810343578.5A CN201810343578A CN108490483B CN 108490483 B CN108490483 B CN 108490483B CN 201810343578 A CN201810343578 A CN 201810343578A CN 108490483 B CN108490483 B CN 108490483B
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Abstract
The invention provides a signal transmission device and a signal transmission system, and relates to the technical field of data transmission based on seismic exploration. In the signal transmission device, a signal sending module is used for being connected with a signal source, the signal sending module comprises a signal sending circuit, and the signal sending circuit comprises a level shifter and a current loop generator. The level shifter is used for being connected with a signal source and converting a signal to be transmitted generated by the signal source into a first voltage signal; the current loop generator is connected with the level converter and used for converting the first voltage signal into a current loop signal and outputting the current loop signal; and the signal receiving module is connected with the current loop generator and used for receiving the current loop signal amplified by the signal sending module from the current loop generator, isolating and amplifying the current loop signal and converting the current loop signal into a voltage signal for outputting. According to the scheme, the signal to be transmitted generated by the signal source is converted into the current loop signal for transmission, so that the signal distortion is reduced, the reliability of signal transmission is improved, and the transmission distance is prolonged.
Description
Technical Field
The invention relates to the technical field of data transmission based on seismic exploration, in particular to a signal transmission device and a signal transmission system.
Background
In seismic exploration, for example, in severe environments such as open mines and underground mines, a geophone is usually required to be buried at a specific position for positioning and analyzing mine microseismic events, so that vibration monitoring, forecasting and early warning are realized, and the geophone is very important for ensuring mine safety and efficient production. When the detector detects a microseismic event, a voltage signal as low as a few microvolts and as high as tens of volts is generated and transmitted to a data acquisition device in the mine.
Because the underground environment condition is severe, explosion-proof data acquisition devices are usually adopted, and the devices are usually heavy and inconvenient to install and maintain, so that the reliability of the micro-seismic monitoring system is reduced, and the mine safety is not facilitated. The voltage signals detected by the microseismic detector are weak generally, a signal transmission cable required from the underground to the ground is long (the length of the cable may exceed 10km), the impedance is large, the weak voltage signals are attenuated, the electromagnetic interference of some mines (such as coal mines) is serious, and further the test signals are seriously deviated from the original signals. That is, in the prior art, in seismic exploration, microseismic signals are weak, have a large dynamic range, are easily subjected to electromagnetic interference, and are difficult to realize long-distance transmission. Therefore, how to provide a solution to the above problems has become a big problem for those skilled in the art.
Disclosure of Invention
In order to overcome the above-mentioned deficiencies in the prior art, the present invention provides a signal transmission device and system with simple circuit structure and easy implementation, so as to solve the above-mentioned problems.
In order to achieve the above object, the technical solutions provided by the preferred embodiments of the present invention are as follows:
a preferred embodiment of the present invention provides a signal transmission apparatus, including:
the signal transmitting module is used for being connected with a signal source and comprises a signal transmitting circuit, and the signal transmitting circuit comprises a level converter and a current loop generator; the level converter is used for being connected with the signal source and converting a signal to be transmitted generated by the signal source into a first voltage signal; the current loop generator is connected with the level converter and used for converting the first voltage signal into a current loop signal and outputting the current loop signal;
and the signal receiving module is connected with the current loop generator and used for receiving the current loop signal amplified by the signal sending module from the current loop generator, isolating and amplifying the current loop signal and converting the current loop signal into a voltage signal for outputting.
Optionally, the signal transmitting circuit further includes a first signal amplifier, where the first signal amplifier is connected to the current loop generator and the signal receiving module, and is configured to receive the current loop signal from the current loop generator, amplify the current loop signal, and output the current loop signal to the signal receiving module.
Optionally, the first pin and the eighth pin of the level shifter are both connected to one end of a first capacitor, and the other end of the first capacitor is grounded;
the second pin and the third pin of the level shifter are both connected with the signal source;
a fourth pin of the level shifter is grounded;
a fifth pin and a sixth pin of the level shifter are both connected with one end of a first resistor, and the other end of the first resistor is connected with a second pin of the current loop generator;
a seventh pin of the level shifter is connected with one end of a second capacitor, and the other end of the second capacitor is grounded;
the first pin of the current loop generator is connected with one end of a third capacitor, the other end of the third capacitor is grounded, the first pin of the current loop generator is also connected with one end of a second resistor, and the other end of the second resistor is grounded through a fourth resistor;
a third pin of the current loop generator is grounded;
the fourth pin and the seventh pin of the current loop generator are connected with the signal receiving module and used for outputting the amplified current loop signal;
a fifth pin of the current loop generator is connected with an emitter of the first signal amplifier;
a sixth pin of the current loop generator is connected with the base electrode of the first signal amplifier;
the seventh pin of the current loop generator is also connected with the collector of the first signal amplifier;
an eighth pin of the current loop generator is grounded through a fifth capacitor;
and a fourth pin and a seventh pin of the current loop generator are connected across a sixth capacitor and a diode, an anode pin of the diode is connected with the fourth pin of the current loop generator, and a cathode pin of the diode is connected with the seventh pin of the current loop generator.
Optionally, the first signal amplifier is a triode.
Optionally, the signal receiving module includes a signal receiving circuit, where the signal receiving circuit includes a power conversion sub-circuit and a signal receiving conversion sub-circuit;
the power conversion sub-circuit is connected with the signal receiving conversion sub-circuit and used for converting a power supply into a power supply with preset parameters to provide electric energy for the signal receiving conversion sub-circuit, and the signal receiving conversion sub-circuit is also connected with the current loop generator.
Optionally, the signal receiving and converting sub-circuit includes a first DC/DC converter and a second signal amplifier, and the first DC/DC converter is connected to the current loop generator;
the second signal amplifier is connected with the current loop generator and used for converting the amplified current loop signal into the voltage signal and outputting the voltage signal.
Optionally, the second signal amplifier is an isolated amplifier.
Optionally, the power conversion sub-circuit comprises a second DC/DC converter connected to the power supply.
Optionally, the signal transmission device further includes a power module connected to the signal receiving module.
The signal transmission system comprises a signal source, a signal receiving device and the signal transmission device, wherein the signal source is connected with a signal sending module in the signal transmission device, and the signal receiving device is connected with a signal receiving module in the signal transmission device.
Compared with the prior art, the signal transmission device and the signal transmission system provided by the invention at least have the following beneficial effects: in the signal transmission device, a signal sending module is used for being connected with a signal source, the signal sending module comprises a signal sending circuit, and the signal sending circuit comprises a level shifter and a current loop generator. The level shifter is used for being connected with a signal source and converting a signal to be transmitted generated by the signal source into a first voltage signal; the current loop generator is connected with the level converter and used for converting the first voltage signal into a current loop signal and outputting the current loop signal; and the signal receiving module is connected with the current loop generator and used for receiving the current loop signal amplified by the signal sending module from the current loop generator, isolating and amplifying the current loop signal and converting the current loop signal into a voltage signal for outputting. The signal transmission device and the system provided by the scheme are simple in structure and easy to realize, and the signal to be transmitted generated by the signal source is converted into the current loop signal for transmission, so that the signal distortion is reduced, the reliability of signal transmission is improved, and the transmission distance is prolonged.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly described below. It is appreciated that the following drawings depict only some embodiments of the invention and are therefore not to be considered limiting of its scope, for those skilled in the art will be able to derive additional related drawings therefrom without the benefit of the inventive faculty.
Fig. 1 is a block diagram of a signal transmission device according to a preferred embodiment of the present invention.
Fig. 2 is an interaction diagram of a signal transmission system according to a preferred embodiment of the invention.
Fig. 3 is a schematic circuit diagram of a signal sending module according to a preferred embodiment of the present invention.
Fig. 4 is a block diagram of a signal receiving module according to a preferred embodiment of the present invention.
Fig. 5 is a schematic circuit diagram of a signal receiving and converting sub-circuit according to a preferred embodiment of the invention.
Fig. 6 is a schematic circuit diagram of a power conversion sub-circuit according to a preferred embodiment of the invention.
Icon: 10-a signal transmission system; 100-a signal transmission device; 110-a signal transmission module; 111-a signal transmission circuit; 120-a signal receiving module; 121-a signal receiving circuit; 122-signal reception conversion sub-circuit; 123-a power conversion sub-circuit; 200-a signal source; 300-signal receiving means.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
Some embodiments of the invention are described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
Referring to fig. 1 and fig. 2 in combination, fig. 1 is a block diagram of a signal transmission device 100 according to a preferred embodiment of the present invention, and fig. 2 is an interaction diagram of a signal transmission system 10 according to a preferred embodiment of the present invention. The signal transmission device 100 provided by the invention can transmit the signal generated by the signal source 200 in geological exploration. Understandably, the signal source 200 is a device for collecting geological data, such as a geophone for detecting seismic waves, or a vibration sensor for detecting geological vibrations, etc. In use, the signal source 200 is typically buried in the subsurface. When the corresponding geological data is detected, the signal source 200 generates a corresponding signal based on the geological data, and the signal is the signal to be transmitted.
Further, the signal transmission device 100 may be used in mine exploration for transmitting the micro-vibration signal acquired by the signal source 200 during detection of micro-vibration of the mine. Understandably, during the exploration of a mine, it is often necessary to measure the microvibrations of the mine in order to issue an alarm prompt before the mine collapses.
In this embodiment, the signal source 200 is usually buried deep underground, so as to reduce the interference on the ground and make the collected data more accurate, and this way makes the signal source 200 and the signal receiving device 300 be far away. That is, the signal generated by the signal source 200 cannot be directly transmitted to the signal receiving apparatus in the prior art. The invention realizes data interaction between the signal source 200 and the signal receiving equipment through the signal transmission device 100, thereby solving the problem that the signal generated by the signal source 200 can not be transmitted in a long distance.
In this embodiment, the signal transmission apparatus 100 may include a signal receiving module 120 and a signal sending module 110. The signal receiving module 120 may include a signal receiving circuit 121. Of course, the signal receiving module 120 may further include a housing for enclosing the signal receiving circuit 121.
Further, the signal transmitting circuit 111 may include a level shifter and a current loop generator. The level shifter is used for being connected with the signal source 200 and converting a signal to be transmitted generated by the signal source 200 into a first voltage signal; the current loop generator is connected with the level converter and used for converting the first voltage signal into a current loop signal and outputting the current loop signal.
The signal receiving module 120 is connected to the current loop generator, and is configured to receive the current loop signal amplified by the signal sending module 110 from the current loop generator, and perform isolation amplification on the current loop signal and convert the current loop signal into a voltage signal for output.
Optionally, the signal transmitting circuit 111 may further include a first signal amplifier. The first signal amplifier is connected to the current loop generator and signal receiving module 120, and is configured to receive a current loop signal from the current loop generator, amplify the current loop signal, and output the current loop signal to the signal receiving module 120.
Referring to fig. 3, a schematic circuit diagram of the signal sending module 110 according to the preferred embodiment of the invention is shown. In fig. 3, the first signal amplifier may be a transistor D1 for amplifying the current loop signal. Of course, in other embodiments, the first signal amplifier may also be a signal amplifying chip, and the first signal amplifier is not particularly limited herein.
Referring to fig. 3 again, in the present embodiment, the signal generated by the signal source 200 is usually a voltage signal, and the level shifter (U1) is used to convert the voltage signal into a low voltage signal. The signal transmitting circuit 111 may include a first connection terminal CN1 and a second connection terminal CN2, the first pin (pin 1) and the eighth pin (pin 8) of the level shifter are both connected to a first capacitor C1, and the other end of the first capacitor C1 is grounded for filtering. The first pin and the eighth pin are reference voltage pins of the level shifter.
The second pin (pin 2) and the third pin (pin 3) of the level shifter are both connected to the signal source 200, wherein the second pin of the level shifter is connected to the pin 1 of the first connection end CN1, the third pin of the level shifter is connected to the pin 2 of the first connection end CN1, so that the signal generated by the signal source 200 is input to the signal transmission apparatus 100, and the second connection end CN2 is used for outputting a current loop signal.
The fourth pin (pin 4) of the level shifter is grounded, i.e. the fourth pin is the negative power supply pin of the level shifter. The fifth pin (pin 5) and the sixth pin (pin 6) of the level shifter are both connected with one end of a first resistor R1, the other end of the first resistor R1 is connected with a second pin (pin 2) of a current loop generator (U2), and the first resistor R1 is matched with the current loop generator and used for converting a voltage signal output by the level shifter into a current loop signal. The seventh pin (pin 7) of the level shifter is connected to one end of the second capacitor C2, and the other end of the second capacitor C2 is grounded.
The first pin (pin 1) of the current loop generator is connected to one end of a third capacitor C3, the other end of the third capacitor C3 is grounded, the first pin of the current loop generator is further connected to one end of a second resistor R2, and the other end of the second resistor R2 is grounded via a fourth resistor R4.
The third pin (pin 3) of the current loop generator is grounded. The fourth pin (pin 4) and the seventh pin (pin 7) of the current loop generator are connected to the signal receiving module 120, and are configured to output the amplified current loop signal. The fifth pin (pin 5) of the current loop generator is connected to the emitter of the first signal amplifier. The sixth pin (pin 6) of the current loop generator is connected to the base of the first signal amplifier. The seventh pin of the current loop generator is also connected to the collector of the first signal amplifier. The eighth pin (pin 8) of the current loop generator is connected to ground via a fifth capacitor C5. The fourth pin and the seventh pin of the current loop generator are connected across the sixth capacitor C6 and the diode D1, the anode pin of the diode D1 is connected with the fourth pin of the current loop generator, and the cathode pin of the diode is connected with the seventh pin of the current loop generator.
Referring to fig. 4 and fig. 5 in combination, fig. 4 is a block diagram of a signal receiving module 120 according to a preferred embodiment of the present invention, and fig. 5 is a schematic circuit diagram of a signal receiving and converting sub-circuit 122 according to a preferred embodiment of the present invention. In this embodiment, the signal receiving module 120 may include a signal receiving circuit 121, and the signal receiving circuit 121 may include a power conversion sub-circuit 123 and a signal receiving conversion sub-circuit 122. The signal receiving and converting sub-circuit 122 may include a third connection CN3 and a fourth connection CN 4.
The power conversion sub-circuit 123 is connected to the signal receiving conversion sub-circuit 122, and is configured to convert a power supply into a power supply with preset parameters to provide electric energy for the signal receiving conversion sub-circuit 122, and the signal receiving conversion sub-circuit 122 is further connected to the current loop generator. The preset parameters may be set according to actual conditions, and are not specifically limited herein.
Optionally, the signal receiving and converting sub-circuit 122 includes a first DC/DC converter, a second signal amplifier, and the first DC/DC converter is connected to the current loop generator. The second signal amplifier is connected with the current loop generator and used for converting the amplified current loop signal into a voltage signal and outputting the voltage signal.
Alternatively, in FIG. 5, the first DC/DC converter may be an isolated DC/DC converter U4, the second signal amplifier may be an isolated amplifier U5., pin 1 of the isolated DC/DC converter U4 is connected to the power supply through a fifth resistor R5, the power supply is also grounded through a polar capacitor C11, pin 2 of the isolated DC/DC converter U4 is grounded through a seventh resistor R7, pin 2 of the isolated DC/DC converter U4 is also connected to one end of a capacitor C12 and one end of a resistor R6, the other end of the capacitor C12 and the other end of the resistor R6 are connected to the power supply of 24V, the other end of the capacitor C12 and the other end of the resistor R6 are also connected to the negative terminal of a diode D2, the positive terminal of a diode D2 is connected to pin 5 of the isolated DC/DC converter U4, the positive terminal of the diode D2 is also connected to the power supply through an inductor L1, the isolated DC/DC converter U4, the isolated DC/DC converter U4 is connected to the ground.
Optionally, referring to fig. 6, a schematic circuit diagram of the power conversion sub-circuit 123 according to the preferred embodiment of the invention is shown. The power conversion sub-circuit 123 may include a second DC/DC converter connected to a power supply. The second DC/DC converter may be an isolated DC/DC converter U3, and is configured to convert the amplified current loop signal into a voltage signal, which helps to reduce electromagnetic interference, reduce distortion of the signal, and improve reliability of signal transmission.
Optionally, the isolated DC/DC converter U3 may include 20 pins. Pin 2, pin 5, pin 6, pin 8, and pin 10 of isolated DC/DC converter U3 are all grounded. Pin 9 of the isolated DC/DC converter U3 is connected to the power supply, and pin 9 of the isolated DC/DC converter U3 is grounded through the capacitor C7 and the capacitor C8 connected in parallel. Pin 11, pin 15, pin 16, and pin 19 of isolated DC/DC converter U3 are grounded. Pin 12 of the isolated DC/DC converter U3 may serve as the +5V power supply output and may be connected to pin 8 of the isolated amplifier U5 for providing power to the isolated amplifier U5. The pin 12 of the isolated DC/DC converter U3 is also grounded through a capacitor C9 and a capacitor C10 connected in parallel, wherein the capacitor C10 may be a polar capacitor.
Optionally, the signal transmission device 100 may further include a power module connected to the signal receiving module 120, where the power module may be a lead storage battery, a lithium ion battery, or the like, and is used to provide power for the signal transmission device 100.
It should be noted that parameters or types of the electronic devices (such as the power supplies, the capacitors, the resistors, the inductors, the isolated DC/DC converter, the current loop generator, etc.) in the circuit of the present invention may be selected according to actual situations, and are not limited specifically herein.
With the above-described design, the signal transmission device 100 is simple in structure, easy to implement, and easy to install and use, and contributes to miniaturization and cost reduction of the signal transmission device 100. This signal transmission device 100 transmits through converting the signal of treating transmission that signal source 200 produced into the electric current ring signal, has improved signal transmission's interference killing feature, helps reducing the distortion of signal in the transmission course, improves the stability of signal in the transmission course, and extension transmission distance, and then is favorable to realizing the transmission of remote signal, improves the precision of data (signal) transmission.
Referring to fig. 2 again, the preferred embodiment of the present invention further provides a signal transmission system 10. The signal transmission system 10 may include a signal source 200, a signal receiving apparatus 300, and the signal transmission apparatus 100. The signal source 200 is connected to the signal transmitting module 110 in the signal transmission device 100, and the signal receiving device 300 is connected to the signal receiving module 120 in the signal transmission device 100. The signal transmission system 10 can be used for acquiring geological data, and can reduce signal distortion and improve the transmission reliability in the remote transmission process of signals.
Further, the signal receiving device 300 may be, but is not limited to, a smart phone, a Personal Computer (PC), a tablet PC, a Personal Digital Assistant (PDA), a Mobile Internet Device (MID), and the like, and is used for processing the voltage signal output by the signal transmitting device 100. For example, when the voltage signal exceeds a preset value, an alarm prompt is sent out, wherein the preset value can be set according to actual conditions.
From the above description of the embodiments, it is clear to those skilled in the art that the present invention can be implemented by hardware, or by software plus a necessary general hardware platform, and based on such understanding, the technical solution of the present invention can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a usb disk, a removable hard disk, etc.), and includes several instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute the method of the various implementation scenarios of the present invention.
In summary, the present invention provides a signal transmission device and system. In the signal transmission device, a signal sending module is used for being connected with a signal source, the signal sending module comprises a signal sending circuit, and the signal sending circuit comprises a level shifter and a current loop generator. The level shifter is used for being connected with a signal source and converting a signal to be transmitted generated by the signal source into a first voltage signal; the current loop generator is connected with the level converter and used for converting the first voltage signal into a current loop signal and outputting the current loop signal; and the signal receiving module is connected with the current loop generator and used for receiving the current loop signal amplified by the signal sending module from the current loop generator, isolating and amplifying the current loop signal and converting the current loop signal into a voltage signal for outputting. The signal transmission device and the system provided by the scheme are simple in structure and easy to realize, and the signal to be transmitted generated by the signal source is converted into the current loop signal for transmission, so that the signal distortion is reduced, the reliability of signal transmission is improved, and the transmission distance is prolonged.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A signal transmission apparatus, characterized in that the signal transmission apparatus comprises:
the signal transmitting module is used for being connected with a signal source and comprises a signal transmitting circuit, and the signal transmitting circuit comprises a level converter and a current loop generator; the level converter is used for being connected with the signal source and converting a signal to be transmitted generated by the signal source into a first voltage signal; the current loop generator is connected with the level converter and used for converting the first voltage signal into a current loop signal and outputting the current loop signal;
the signal receiving module is connected with the current loop generator and used for receiving the current loop signal amplified by the signal sending module from the current loop generator, isolating and amplifying the amplified current loop signal and converting the amplified current loop signal into a voltage signal to be output;
the signal sending circuit further comprises a first signal amplifier, wherein the first signal amplifier is connected with the current loop generator and the signal receiving module, and is used for receiving the current loop signal from the current loop generator, amplifying the current loop signal and outputting the current loop signal to the signal receiving module;
a first pin and an eighth pin of the level shifter are both connected with one end of a first capacitor, and the other end of the first capacitor is grounded;
the second pin and the third pin of the level shifter are both connected with the signal source;
a fourth pin of the level shifter is grounded;
a fifth pin and a sixth pin of the level shifter are both connected with one end of a first resistor, and the other end of the first resistor is connected with a second pin of the current loop generator;
a seventh pin of the level shifter is connected with one end of a second capacitor, and the other end of the second capacitor is grounded;
the first pin of the current loop generator is connected with one end of a third capacitor, the other end of the third capacitor is grounded, the first pin of the current loop generator is also connected with one end of a second resistor, and the other end of the second resistor is grounded through a fourth resistor;
a third pin of the current loop generator is grounded;
the fourth pin and the seventh pin of the current loop generator are connected with the signal receiving module and used for outputting the amplified current loop signal;
a fifth pin of the current loop generator is connected with an emitter of the first signal amplifier;
a sixth pin of the current loop generator is connected with the base electrode of the first signal amplifier;
the seventh pin of the current loop generator is also connected with the collector of the first signal amplifier;
an eighth pin of the current loop generator is grounded through a fifth capacitor;
and a fourth pin and a seventh pin of the current loop generator are connected across a sixth capacitor and a diode, an anode pin of the diode is connected with the fourth pin of the current loop generator, and a cathode pin of the diode is connected with the seventh pin of the current loop generator.
2. The signal transmission device of claim 1, wherein the first signal amplifier is a triode.
3. The signal transmission device according to claim 1, wherein the signal receiving module comprises a signal receiving circuit, and the signal receiving circuit comprises a power conversion sub-circuit and a signal receiving conversion sub-circuit;
the power conversion sub-circuit is connected with the signal receiving conversion sub-circuit and used for converting a power supply into a power supply with preset parameters to provide electric energy for the signal receiving conversion sub-circuit, and the signal receiving conversion sub-circuit is also connected with the current loop generator.
4. The signal transmission apparatus of claim 3, wherein the signal receiving and converting sub-circuit comprises a first DC/DC converter, a second signal amplifier, the first DC/DC converter being connected to the current loop generator;
the second signal amplifier is connected with the current loop generator and used for converting the amplified current loop signal into the voltage signal and outputting the voltage signal.
5. The signal transmission apparatus of claim 4, wherein the second signal amplifier is an isolated amplifier.
6. The signal transmission apparatus of claim 3, wherein the power conversion sub-circuit comprises a second DC/DC converter connected to the power supply.
7. The signal transmission device according to any one of claims 1 to 6, further comprising a power supply module connected to the signal receiving module.
8. A signal transmission system, comprising a signal source, a signal receiving device and the signal transmission device as claimed in any one of claims 1 to 7, wherein the signal source is connected to a signal sending module in the signal transmission device, and the signal receiving device is connected to a signal receiving module in the signal transmission device.
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| CN101789684A (en) * | 2010-03-05 | 2010-07-28 | 于锁平 | Power factor corrector |
| CN102772200A (en) * | 2012-08-06 | 2012-11-14 | 山东省科学院激光研究所 | Pulse-taking signal sensor probe and optical fiber pulse-taking information acquisition system |
| CN103972894A (en) * | 2014-04-29 | 2014-08-06 | 广西电网公司电力科学研究院 | Control method and system for power electronic transformer |
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