CN110880946A - Communication circuit for controlling optical fiber positioning unit of telescope - Google Patents

Abstract

The invention provides a communication circuit for controlling a telescope optical fiber positioning unit, which is applied to the technical field of communication and comprises a main node coupling circuit and at least one slave node separation circuit, wherein the slave node separation circuits are arranged in one-to-one correspondence with slave controllers, the main node coupling circuit couples a control signal sent by the main controller with direct current voltage output by a direct current power supply to obtain a coupled control signal, the coupled control signal is transmitted through a direct current power line, each slave node separation circuit separates the coupled control signal to respectively obtain the control signal and the direct current voltage, the separated control signal is output to the corresponding slave controller, and the separated direct current voltage is output to the corresponding load. Through this communication circuit, can replace the wireless transmission network who uses among the prior art, realize control signal's transmission based on the direct current power line, improve control signal transmission's stability.

Description

A communication circuit for controlling the optical fiber positioning unit of a telescope

technical field

The invention belongs to the technical field of communication, and in particular relates to a communication circuit used for controlling the optical fiber positioning unit of a telescope.

Background technique

ZigBee is a wireless network protocol for low-speed and short-distance transmission. It is suitable for a series of electronic components and devices with short transmission range and low data transmission rate. In the control system based on ZigBee, it can often be realized by a main controller Information transfer with multiple slave controllers. Taking the LAMOST telescope as an example, the LAMOST telescope has 4,000 optical fibers placed on the focal panel. During the observation process, the position of each optical fiber needs to be adjusted according to the observation requirements to collect the spectrum of distant celestial objects. The root fiber is moved by two stepping motors driven by a fiber positioning unit.

In the actual control of each optical fiber, most of the DC power supply provides driving power to the optical fiber drive unit and stepper motor of each optical fiber through the DC power line. The fiber optic drive unit transmits control signals.

However, in practical applications, using ZigBee wireless network to transmit the control signal of the LAMOST telescope optical fiber positioning unit, sometimes the control signal transmission is unstable or even fails. Therefore, how to provide a more stable communication method, Ensuring reliable transmission of control signals has become one of the problems to be solved urgently by those skilled in the art.

SUMMARY OF THE INVENTION

In view of this, the object of the present invention is to provide a communication circuit for the control of the optical fiber positioning unit of the telescope, to replace the wireless network used in the prior art, to realize the transmission of the control signal based on the DC power line, and to improve the stability of the transmission of the control signal, To ensure reliable transmission of control signals, the specific solutions are as follows:

The communication circuit for controlling the optical fiber positioning unit of the telescope provided by the present invention includes: a master node coupling circuit and at least one slave node separation circuit, and one of the slave node separation circuits corresponds to a slave controller, wherein,

The master node coupling circuit includes a DC input terminal, a composite output terminal, and an instruction receiving terminal, the DC input terminal is connected to the DC power supply, the composite output terminal is connected to one end of the DC power line, and the instruction receiving terminal is connected to the main control connected to the device;

The slave node separation circuit includes a composite input end, a command output end, and a DC output end, the composite input end is connected to the other end of the DC power line, the command output end is connected to a corresponding slave controller, and the The DC output terminal is connected to the corresponding load;

The master node coupling circuit is used to couple the control signal output by the master controller with the DC voltage output by the DC power supply, and output the coupled control signal to each of the slave node separation circuits via the DC power line ;

The slave node separation circuit is used for separating the coupled control signal, and outputting the separated control signal to the corresponding slave controller through the command output terminal, and sending the separated DC voltage through the command output terminal. The DC output terminal is output to the corresponding load.

Optionally, the master node coupling circuit includes: an inverse amplifier circuit and at least one coupling circuit, wherein,

The first input terminal of the reverse amplifier circuit is used as the command receiving terminal of the main node coupling circuit, the second input terminal of the reverse amplifier circuit is connected to the DC power supply, and the output terminal of the reverse amplifier circuit is connected to the DC power supply. connected to the first input end of the coupling circuit;

The second input end of the coupling circuit is used as the DC input end of the main node coupling circuit, and the output end of the coupling circuit is used as the composite output end of the main node coupling circuit.

Optionally, the reverse amplifier circuit includes: a first voltage dividing resistor, a second voltage dividing resistor, a current limiting resistor, and a first switch tube, wherein,

One end of the first voltage dividing resistor is used as the first input end of the inverse amplifying circuit, and the other end of the first voltage dividing resistor is connected to one end of the second voltage dividing resistor;

The other end of the second voltage dividing resistor is grounded;

One end of the current limiting resistor is used as the second input end of the reverse amplifier circuit, and the other end of the current limiting resistor is connected to the first end of the first switch tube;

The control end of the first switch tube is connected to the series connection point of the first voltage divider resistor and the second voltage divider resistor, and the second end of the first switch tube is grounded;

The series connection point of the current limiting resistor and the first switch tube is used as the output end of the reverse amplifier circuit.

Optionally, the coupling circuit includes: a bleeder resistor and a second switch tube, wherein,

One end of the bleeder resistor is connected to the control end of the second switch tube, and the other end of the bleeder resistor is connected to the first end of the second switch tube;

The control end of the second switch tube is used as the first input end of the coupling circuit, the first end of the second switch tube is used as the second input end of the coupling circuit, and the second end of the second switch tube is used as the second input end of the coupling circuit. The terminal is used as the output terminal of the coupling circuit.

Optionally, the slave node separation circuit includes: a separation circuit and a DC recovery circuit, wherein,

The connection point between the input end of the separation circuit and the input end of the DC recovery circuit is used as the composite input end of the slave node separation circuit;

The output end of the separation circuit is used as the instruction output end of the slave node separation circuit;

The output terminal of the DC recovery circuit is used as the DC output terminal of the slave node separation circuit.

Optionally, the separation circuit includes: a first separation resistor and a second separation resistor, wherein,

One end of the first separation resistor is used as the input end of the separation circuit, and the other end of the first separation resistor is grounded through the second separation resistor;

The series connection point of the first separation resistor and the second separation resistor serves as the output end of the separation circuit.

Optionally, the DC recovery circuit includes: a first diode and a plurality of capacitors, wherein,

Each of the capacitors is connected in parallel to form a parallel branch;

One end of the first diode is used as the input end of the DC recovery circuit, and the other end of the first diode is grounded through the parallel branch;

The series connection point of the first diode and the parallel branch is used as the output end of the DC recovery circuit.

Optionally, the slave node separation circuit further includes: a second diode disposed between the composite input end and a connection point between the input end of the separation circuit and the input end of the DC recovery circuit.

Optionally, the slave node separation circuit further includes: a switch and a fuse arranged between the composite input terminal and the second diode, and the switch and the fuse are connected in series.

Optionally, the slave node separation circuit provides power for the slave controller.

Based on the above content, the communication circuit for controlling the optical fiber positioning unit of the telescope provided by the present invention includes a master node coupling circuit and at least one slave node separation circuit, and the slave node separation circuit is set in a one-to-one correspondence with the slave controller, and the master controller sends out a control The signal is sent to the main node coupling circuit, and the main node coupling circuit couples the control signal sent by the main controller and the DC voltage output by the DC power supply to obtain the coupled control signal, and transmits the obtained coupled control signal through the DC power line. After the node separation circuit receives the coupled control signal through the DC power line, it separates the coupled control signal, obtains the control signal sent by the main controller and the DC voltage output by the DC power supply, and outputs the separated control signal to the The corresponding slave controller, meanwhile, outputs the separated DC voltage to the corresponding load. The communication circuit for the control of the optical fiber positioning unit of the telescope provided by the present invention can replace the wireless transmission network used in the prior art, realize the transmission of the control signal based on the DC power line, effectively improve the stability of the transmission of the control signal, and ensure the transmission of the control signal. Reliable transmission.

Further, since the transmission of the control signal is realized based on the DC power line, compared with the wireless transmission method, no additional electromagnetic interference will be generated. Therefore, it is also suitable for other application scenarios with strict requirements on the electromagnetic environment, and the scope of application is wider.

Description of drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are For some embodiments of the present invention, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

1 is a schematic diagram of an application scenario of a communication circuit for controlling a telescope optical fiber positioning unit provided by an embodiment of the present invention;

2 is a circuit topology diagram of a master node coupling circuit provided by an embodiment of the present invention;

3 is a schematic diagram of a control signal waveform change process in an embodiment of the present invention;

4 is a circuit topology diagram of another master node coupling circuit provided by an embodiment of the present invention;

FIG. 5 is a circuit topology diagram of a circuit for separating a slave node according to an embodiment of the present invention.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions 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. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Optionally, referring to FIG. 1 , FIG. 1 is a schematic diagram of an application scenario of a communication circuit for controlling the optical fiber positioning unit of a telescope provided by an embodiment of the present invention, and FIG. 1 shows an embodiment of the present invention for positioning the optical fiber of a telescope. The communication circuit controlled by the unit is the connection relationship between the DC transmission line, the master controller, the slave controller, and the load when the control signal is transmitted. Specifically, the communication circuit for controlling the optical fiber positioning unit of the telescope provided by the embodiment of the present invention includes: a master node coupling circuit 10 and at least one slave node separation circuit 20 (in FIG. 1, the slave node separation circuit 1, the slave node separation circuit 2 , and the separation circuit from node n is shown), where,

The master node coupling circuit 10 includes a DC input end, a composite output end, and an instruction receiving end. In the application scenario shown in FIG. 1 , the DC input end of the master node coupling circuit 10 is connected to the output end of the DC power supply 30 , and the master node coupling circuit The composite output terminal 10 is connected to one end of the DC power line 70, that is, the main node coupling circuit 10 is connected in series between the DC power supply 30 and the DC power line 70, and the power output by the DC power supply 30 passes through the main node coupling circuit 10. 70 realizes the transmission of electrical energy. Further, the command receiving end of the master node coupling circuit 10 is connected to the master controller 40 to receive the control signal output by the master controller 40 .

Based on the above connection relationship, the master node coupling circuit 10 couples the control signal output by the main controller 40 with the DC voltage output by the DC power supply 30 to obtain the coupled control signal, and then transmits the coupled control signal through the DC power line 70 .

The slave node separation circuit 20 includes a composite input terminal, a command output terminal, and a DC output terminal. In specific use, the composite input end of the slave node separation circuit 20 is connected to the other end of the DC power line 70, and the coupled control signal output by the composite output end of the master node coupling circuit 10 is received through the DC power line 70; the slave node separation circuit 20 The command output terminal of the node is connected to the corresponding slave controller 50 , and correspondingly, the DC output terminal of the slave node separation circuit 20 is connected to the corresponding load 60 .

Based on the above-mentioned connection relationships between the slave node separation circuit 20 and the DC power line 70 , the slave controller 50 , and the load 60 , it can be seen that the slave node separation circuit 20 provided by the embodiment of the present invention is used to separate the coupling received from the DC power line 70 . The last control signal is separated to obtain the control signal originally sent by the master controller 40 , and the control signal is output to the corresponding slave controller 50 through the command output terminal. After receiving the control signal sent by the master controller 40, the slave controller 50 controls the working process of the corresponding load 60 or other controlled objects controlled by the slave controller 50 according to the specific content of the control signal, and completes the control information Based on the transmission process of the DC power line; at the same time, since the main node coupling circuit 10 changes the waveform of the DC voltage when coupling the control signal and the DC voltage, it is also necessary to restore the DC voltage before the DC voltage is involved in the specific load. , that is, the slave node separation circuit 20 is also used to output the DC voltage obtained after separation to the corresponding load 60 through the DC output terminal, so as to ensure the normal power supply of the load 60 .

In a specific application, the number of slave node separation circuits 20 needs to be set according to the number of loads 60 and the number of slave controllers 50. When multiple slave node separation circuits 20 are included, the composite input terminals of each slave node separation circuit 20 are connected in parallel at the other end of the DC power line 70 . Moreover, in most cases, the slave node separation circuits 20 and the slave controllers 50 are provided in a one-to-one correspondence, that is, one slave node separation circuit 20 is connected to one slave controller 50 correspondingly. Optionally, in order to improve the power supply stability of the load 60 , the slave node separation circuit 20 and the load 60 may also be set one-to-one, that is, one slave node separation circuit 20 only supplies power to one load 60 . Of course, by setting the power relationship between the slave node separation circuit 20 and the connected load 60, one slave node separation circuit 20 can also supply power to more than one load 60 at the same time. No specific limitation is made.

When applied to the control of each optical fiber in the aforementioned LAMOST telescope, the slave controller mentioned in the embodiment of the present invention can be each light drive unit, and the DC output end of the slave node separation circuit is directly connected to the drive chip of the stepping motor. connected, and the stepper motor is further driven by the driver chip.

To sum up, in the communication circuit for controlling the optical fiber positioning unit of the telescope provided by the embodiment of the present invention, the main node coupling circuit couples the control signal of the main controller with the DC voltage on the DC power line, and transmits the coupled signal through the DC power line. Control signal, the slave node separation circuit connected to the downstream of the DC power line separates the received coupled control signal to obtain the control signal originally sent by the master controller, and at the same time, restores the waveform of the DC voltage to that output by the DC power supply. Voltage waveform, that is, while realizing control signal transmission based on DC power line, it does not affect the normal transmission and use of DC power. Therefore, the communication circuit for controlling the optical fiber positioning unit of the telescope provided by the embodiment of the present invention can replace the wireless transmission network used in the prior art, realize the transmission of the control signal based on the DC power line, and effectively improve the stability of the transmission of the control signal.

Further, since the transmission of the control signal is realized based on the DC power line, compared with the wireless transmission method, no additional electromagnetic interference will be generated. Therefore, it is also suitable for other application scenarios with strict requirements on the electromagnetic environment, and the scope of application is wider.

Optionally, the embodiment of the present invention provides an optional construction manner of the master node coupling circuit. Specifically, referring to FIG. 2, FIG. 2 is a circuit topology diagram of a master node coupling circuit provided by an embodiment of the present invention. The master node coupling circuit provided by an embodiment of the present invention includes: an inverse amplifier circuit and at least one coupling circuit ( shown in the figure), wherein,

The first input end of the inverse amplifying circuit is used as the instruction receiving end of the main node coupling circuit, and is connected with the main controller, the second input end of the inverse amplifying circuit is connected with the DC power supply, and the output end of the inverse amplifying circuit is connected with the coupling circuit. The first input end is connected, and the level output to the first input end of the coupling circuit is adjusted according to the difference of the control signal received by the first input end and the DC voltage of the DC power source received by the second input end.

Specifically, in the embodiment shown in FIG. 2, the reverse amplifier circuit specifically includes a first voltage dividing resistor R1, a second voltage dividing resistor R2, a current limiting resistor R3, and a first switch tube Q1, wherein,

One end of the first voltage dividing resistor R1 is used as the first input end of the reverse amplifier circuit, and is connected to the main controller (in the embodiment shown in FIG. 2, the specific connection pin of the main controller is shown by MASTER-TX), The other end of the first voltage dividing resistor R1 is connected to one end of the second voltage dividing resistor R2, that is, the first voltage dividing resistor R1 and the second voltage dividing resistor R2 are connected in series, and the other end of the second voltage dividing resistor R2 is grounded.

One end of the current limiting resistor R3 is used as the second input end of the reverse amplifier circuit and is connected to the DC power supply Vin, and the other end of the current limiting resistor R3 is connected to the first end of the first switch tube Q1. Optionally, in the embodiment of the present invention, the first switch transistor Q1 is an NMOS transistor, and the drain of the first switch transistor Q1 is connected to the DC power supply Vin through a current limiting resistor R3. The current limiting resistor R3 is mainly used to adjust the current value output to the coupling circuit, which can be calculated by selecting the DC power supply voltage Vin/R3. When the DC power supply voltage is constant, changing the resistance value of the bleeder resistor R3 can realize the Adjustment of the current value output to the coupling circuit.

Further, the control terminal of the first switch tube Q1 is connected to the series connection point of the first voltage dividing resistor R1 and the second voltage dividing resistor R2, and the second terminal of the first switch tube Q1 is grounded. In the embodiment of the present invention, the source of the first switch transistor Q1 is grounded. According to the connection relationship shown in Figure 2, the difference in the output level of the main controller pin MASTER-TX will cause the control end of the first switch tube Q1 to obtain different voltage values after voltage division, and thus can realize the first Control of the conduction state of the switch tube Q1.

The series connection point of the current limiting resistor R3 and the first switch tube Q1 is used as the output end of the reverse amplifier circuit, and is connected to the input end of the coupling circuit.

As mentioned above, the first input end of the coupling circuit is connected to the output end of the reverse amplifier circuit, and the second input end of the coupling circuit is used as the DC input end of the main node coupling circuit, and is connected to the DC power supply. At the same time, the output end of the coupling circuit is The terminal is connected to the DC power line as the composite output terminal of the main node coupling circuit, and it is also shown in FIG. 2 that the final output of the main node coupling circuit is V _Lout .

Specifically, in the embodiment shown in FIG. 2 , the coupling circuit specifically includes a bleeder resistor R4 and a second switch transistor Q2, wherein,

One end of the bleeder resistor R4 is connected to the control end of the second switch tube Q2, and the other end of the bleeder resistor R4 is connected to the first end of the second switch tube Q2. The second switch transistor Q2 is implemented by using a PMOS transistor. In this case, the bleeder resistor R4 is connected in parallel between the source and the gate of the second switch transistor Q2. The bleeder resistor R4 is mainly used to improve the turn-off characteristics of the PMOS transistor, improve the falling edge of the signal, and ensure the switching speed of the second switch transistor Q2.

Further, the control terminal of the second switch tube Q2, that is, the gate, is connected to the output terminal of the inverse amplifier circuit as the first input terminal of the coupling circuit, and the first terminal of the second switch tube Q2 is used as the second input terminal of the coupling circuit. The terminal is connected to the DC power supply Vin. When the PMOS tube is selected, the source of the second switch tube Q2 is connected to the DC power supply, and the second end of the second switch tube Q2, such as the drain of the PMOS tube, is used as the output of the coupling circuit. That is, the output terminal V _Lout of the main node coupling circuit is connected to the DC power line.

The working process of the master node coupling circuit provided by the embodiment of the present invention is described below with reference to the example shown in FIG. 2 :

Assuming that the DC voltage value of the DC power supply Vin is 12V, the control signal output by the main controller is represented by a pulse signal composed of high and low levels according to preset rules, and the low level of the pulse signal is 0V, and the high level is 0V. 3.3V.

When the control signal output from the control signal output terminal of the main controller is at a low level of 0V, the voltage at the series connection point of the first voltage dividing resistor R1 and the second voltage dividing resistor R2 is 0V, and the first switch tube Q1 is in an off state , the output voltage of the directional amplifier circuit is the power supply voltage of the DC power supply 12V. At this time, the voltage between the gate and the source of the second switch tube Q2 (PMOS tube) is Vgs=0V, then the second switch tube Q2 is in an off state , the final output of the main node coupling circuit is low level 0V.

Correspondingly, when the control signal output by the control signal output terminal of the main controller is a high level of 3.3V, the series connection point of the first voltage dividing resistor R1 and the second voltage dividing resistor R2 is divided according to the preset voltage dividing ratio. The voltage value of the first switch tube Q1 will be in a conducting state, the DC power supply is connected to the ground through the current limiting resistor R3, and the first switch tube Q1 is grounded. Since the resistance value of the first switch Q1 is very low when it is in the on state, the first input terminal of the coupling circuit, that is, the input voltage of the gate of the second switch Q2 can be considered to be 0V, and the gate of the second switch Q2 can be considered as 0V. The voltage between the source and the source is Vgs=-Vin. In this case, the second switch transistor Q2 is in an on state, and the final output voltage of the main node coupling circuit is a high level of 12V.

It can be seen from the above content that the reverse amplifier circuit and the coupling circuit cooperate to couple the control signal sent by the main controller with the DC voltage output by the DC power supply, thereby realizing the transmission of the control signal through the DC power line. The output control signal is amplified.

Optionally, see FIG. 3, which is a schematic diagram of the waveform change process of the control signal in the embodiment of the present invention. As shown in FIG. 3, the control signal output by the controller consists of a low level of 0V and a high level of 3.3V. The coupled control signal obtained after amplification becomes composed of 0V low level and 12V high level.

Further, the load current is output by the DC power supply, so that the master controller can control dozens of slave controllers at the same time, and supply power for dozens of loads at the same time, which greatly improves the load capacity.

Optionally, in order to further increase the transmission capability of the master node coupling circuit, multiple coupling circuits in the master node coupling circuit may also be set. As shown in FIG. 4 , the master node coupling circuit given in the embodiment shown in FIG. The circuit includes two coupling circuits. The circuit structures of the two coupling circuits are exactly the same and are in a parallel relationship. The connection relationship of the other coupling circuit shown in FIG. 4 will not be described here. .

Optionally, the embodiment of the present invention also provides an optional construction manner of the circuit for separating the slave nodes. Specifically, referring to FIG. 5, FIG. 5 is a circuit topology diagram of a slave node separation circuit provided by an embodiment of the present invention. The slave node separation circuit provided by the embodiment of the present invention includes: a separation circuit and a DC recovery circuit, wherein,

The input end of the separation circuit is connected with the input end of the DC recovery circuit, and the connection point between the input end of the separation circuit and the input end of the DC recovery circuit is connected with the DC power line as the composite input end of the slave node separation circuit, and further, the output of the separation circuit is connected to the DC power line. As the command output terminal of the slave node separation circuit, it is connected to the corresponding slave controller, and outputs the control signal obtained after separation to the corresponding slave controller. It is conceivable that in this case, the control signal received by the slave controller The signal is completely consistent with the control signal sent by the main controller. Based on the transmission process of the DC power line, it will not have any impact on the control signal, and the control information can be transmitted safely and effectively.

The output terminal of the DC recovery circuit is used as the DC output terminal of the slave node separation circuit, and is connected with the corresponding load to supply power for the load.

Specifically, in the embodiment shown in FIG. 5 , the separation circuit specifically includes: a first separation resistor R5 and a second separation resistor R6 . One end of the first separation resistor R5 is used as the input end of the separation circuit, and is connected to the input end of the DC recovery circuit, that is, connected to the DC power line; the other end of the first separation resistor R5 is grounded through the second separation resistor R6. The series connection point of the first separation resistor R5 and the second separation resistor R6 serves as the output terminal of the separation circuit.

Based on the above connection relationship, when the separation circuit receives the coupled control signal transmitted by the DC power line, the amplified control signal is reduced to the high voltage when the main controller actually outputs the control signal through the voltage dividing action of the separation circuit. For the flat voltage value, it is conceivable that the low level 0V in the control signal is also 0V after coupling, and similarly, it is still 0V after separation.

Following the previous example, the high level included in the control signal output by the main controller is 3.3V, which becomes 12V after coupling. At this time, the first separation resistor R5 and the second separation resistor can be determined according to the high-level voltage ratio before and after coupling. The resistance of R6. Specifically, the first separation resistor R5 and the second separation resistor R6 can be selected according to the following formula:

Combined with the circuit structure shown in Figure 5 and the above formula, the signal receiving end of the slave controller (shown as MCU-RXD in the figure) is connected to the series connection point of the first separation resistor R5 and the second separation resistor R6, which reads The level value of Ω is the same as the voltage drop on the second separation resistor R6. By adjusting the resistance ratio of the first separation resistor R5 and the second separation resistor R6, the separation of the control signal can be realized.

Specifically, in the embodiment shown in FIG. 5 , the DC recovery circuit specifically includes: a first diode D1 and a plurality of capacitors (the capacitors C1, C2 and C3 are exemplarily shown in the figure), wherein,

Each capacitor is connected in parallel to form a parallel branch, one end of the first diode D1 is connected to the DC power line as the input end of the DC recovery circuit, and receives the coupled control signal transmitted by the DC power line, and the other end of the first diode D1 The parallel branch is grounded; the series connection point of the first diode D1 and the parallel branch is used as the output terminal of the DC recovery circuit to output the recovered DC power, and then supply power to the load connected to the DC output terminal VBB of the slave node separation circuit .

Optionally, in order to simplify the overall layout of the circuit structure, the DC output terminal VBB of the slave node separation circuit can also supply power to the corresponding slave controller at the same time. It is conceivable that the DC output terminal of the slave node separation circuit outputs the voltage of the DC power supply, which is higher than the working voltage of the slave controller in most cases. Therefore, in order to ensure the normal operation of the slave controller, you can also Then, a corresponding step-down circuit is arranged between the DC output end of the slave node separation circuit and the slave controller, and the slave controller is provided with a working voltage through the step-down circuit.

The selection of the step-down circuit may be implemented with reference to the implementation manner in the prior art, which is not limited in this embodiment of the present invention.

Optionally, in the embodiment shown in FIG. 5 , the slave node separation circuit further includes a second diode D2 disposed between the composite input end and the connection point between the input end of the separation circuit and the input end of the DC recovery circuit. Specifically, the anode of the second diode D2 is close to the composite input end of the slave node separation circuit, that is, close to the DC power line side. The second diode D2 can isolate the interference of the slave node separation circuit to the DC power line, so as to ensure that the slave node separation circuits are independent of each other.

Further, in the embodiment shown in FIG. 5 , the slave node separation circuit further includes: a switch SWITCH and a fuse F1 disposed between the composite input terminal and the second diode D2, and the switch SWITCH and the fuse F1 are connected in series. By setting the switch, the connection relationship between the corresponding slave node separation circuit and the DC power line can be flexibly controlled, and the connection between the slave node separation circuit and the DC power line can be disconnected when necessary. Setting a fuse can improve the safety of the slave node separation circuit, and avoid overcurrent to the slave node separation circuit and its connected slave controllers and loads from being burned.

It should be noted that, according to the coupling and separation process of the above-mentioned control signals, the communication circuit for controlling the optical fiber positioning unit of the telescope provided by the embodiment of the present invention is mainly applied to the transmission of serial signals. Choose a controller with serial signal transmit and receive ports.

Further, the method for sending the control signal by the main controller, the communication protocol to follow, the period for sending the control signal, etc., can all be performed with reference to the transmission mode of the control signal in the prior art, and the control signal sent by the main controller should at least include: Address bits, data bits and parity bits, all slave node separation circuits connected to the DC power line can receive the coupled control signals, and send the separated control signals to the corresponding slave controllers. The address information in the received control signal determines whether the received control signal needs a response. If a response is required, the load is controlled to run in a specified state according to the control information contained in the data bits in the control signal. Correspondingly, if the received control signal is received If the control command does not need to be corresponding, it will not perform any operation.

The embodiments of the present invention do not limit the process of the master controller sending the control signal, the slave controller parsing the control signal, and controlling the corresponding load action according to the control signal, which may be performed with reference to the implementation manner in the prior art.

The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments can be referred to each other. As for the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant part can be referred to the description of the method.

Professionals may further realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two, in order to clearly illustrate the possibilities of hardware and software. Interchangeability, the above description has generally described the components and steps of each example in terms of functionality. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of the present invention.

The steps of a method or algorithm described in conjunction with the embodiments disclosed herein may be directly implemented in hardware, a software module executed by a processor, or a combination of the two. A software module can be placed in random access memory (RAM), internal memory, read only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other in the technical field. in any other known form of storage medium.

The above description of the disclosed embodiments enables any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be implemented in other embodiments without departing from the core idea or scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. a communication circuit for the control of a telescope optical fiber positioning unit, is characterized in that, comprising: a master node coupling circuit and at least one slave node separation circuit, and a described slave node separation circuit corresponds to a slave controller, wherein, The master node coupling circuit includes a DC input terminal, a composite output terminal, and an instruction receiving terminal, the DC input terminal is connected to the DC power supply, the composite output terminal is connected to one end of the DC power line, and the instruction receiving terminal is connected to the main control connected to the device; The slave node separation circuit includes a composite input end, a command output end, and a DC output end, the composite input end is connected to the other end of the DC power line, the command output end is connected to a corresponding slave controller, and the The DC output terminal is connected to the corresponding load; The master node coupling circuit is used to couple the control signal output by the master controller with the DC voltage output by the DC power supply, and output the coupled control signal to each of the slave node separation circuits via the DC power line ; The slave node separation circuit is used for separating the coupled control signal, and outputting the separated control signal to the corresponding slave controller through the command output terminal, and sending the separated DC voltage through the command output terminal. The DC output terminal is output to the corresponding load. 2. The communication circuit for controlling the optical fiber positioning unit of the telescope according to claim 1, wherein the main node coupling circuit comprises: a reverse amplifier circuit and at least one coupling circuit, wherein, The first input terminal of the reverse amplifier circuit is used as the command receiving terminal of the main node coupling circuit, the second input terminal of the reverse amplifier circuit is connected to the DC power supply, and the output terminal of the reverse amplifier circuit is connected to the DC power supply. connected to the first input end of the coupling circuit; The second input end of the coupling circuit is used as the DC input end of the main node coupling circuit, and the output end of the coupling circuit is used as the composite output end of the main node coupling circuit. 3. The communication circuit for controlling the optical fiber positioning unit of the telescope according to claim 2, wherein the reverse amplifier circuit comprises: a first voltage dividing resistor, a second voltage dividing resistor, a current limiting resistor, and a first voltage dividing resistor. A switch tube, of which, One end of the first voltage dividing resistor is used as the first input end of the inverse amplifying circuit, and the other end of the first voltage dividing resistor is connected to one end of the second voltage dividing resistor; The other end of the second voltage dividing resistor is grounded; One end of the current limiting resistor is used as the second input end of the reverse amplifier circuit, and the other end of the current limiting resistor is connected to the first end of the first switch tube; The control end of the first switch tube is connected to the series connection point of the first voltage divider resistor and the second voltage divider resistor, and the second end of the first switch tube is grounded; The series connection point of the current limiting resistor and the first switch tube is used as the output end of the reverse amplifier circuit. 4. The communication circuit for controlling the optical fiber positioning unit of the telescope according to claim 2, wherein the coupling circuit comprises: a bleeder resistor and a second switch tube, wherein, One end of the bleeder resistor is connected to the control end of the second switch tube, and the other end of the bleeder resistor is connected to the first end of the second switch tube; The control end of the second switch tube is used as the first input end of the coupling circuit, the first end of the second switch tube is used as the second input end of the coupling circuit, and the second end of the second switch tube is used as the second input end of the coupling circuit. The terminal is used as the output terminal of the coupling circuit. 5. The communication circuit for controlling the optical fiber positioning unit of the telescope according to claim 1, wherein the slave node separation circuit comprises: a separation circuit and a DC recovery circuit, wherein, The connection point between the input end of the separation circuit and the input end of the DC recovery circuit is used as the composite input end of the slave node separation circuit; The output end of the separation circuit is used as the instruction output end of the slave node separation circuit; The output terminal of the DC recovery circuit is used as the DC output terminal of the slave node separation circuit. 6. The communication circuit for controlling the optical fiber positioning unit of the telescope according to claim 5, wherein the separation circuit comprises: a first separation resistor and a second separation resistor, wherein, One end of the first separation resistor is used as the input end of the separation circuit, and the other end of the first separation resistor is grounded through the second separation resistor; The series connection point of the first separation resistor and the second separation resistor serves as the output end of the separation circuit. 7. The communication circuit for controlling the optical fiber positioning unit of the telescope according to claim 5, wherein the DC recovery circuit comprises: a first diode and a plurality of capacitors, wherein, Each of the capacitors is connected in parallel to form a parallel branch; One end of the first diode is used as the input end of the DC recovery circuit, and the other end of the first diode is grounded through the parallel branch; The series connection point of the first diode and the parallel branch is used as the output end of the DC recovery circuit. 8 . The communication circuit for controlling the optical fiber positioning unit of a telescope according to claim 5 , wherein the slave node separation circuit further comprises: an input end and an input end arranged on the composite input end and the separation circuit. 9 . A second diode between the connection points of the input terminals of the DC recovery circuit. 9 . The communication circuit for controlling the optical fiber positioning unit of the telescope according to claim 8 , wherein the slave node separation circuit further comprises: disposed between the composite input end and the second diode. 10 . a switch and a fuse, and the switch and the fuse are connected in series. 10 . The communication circuit for controlling the optical fiber positioning unit of a telescope according to claim 1 , wherein the slave node separation circuit provides power for the slave controller. 11 .

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