CN115701696A - Carrier modulation device - Google Patents
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- CN115701696A CN115701696A CN202110882421.1A CN202110882421A CN115701696A CN 115701696 A CN115701696 A CN 115701696A CN 202110882421 A CN202110882421 A CN 202110882421A CN 115701696 A CN115701696 A CN 115701696A
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Abstract
The invention discloses a carrier modulation device which comprises a first carrier modulation unit, a second carrier modulation unit and an Nth carrier modulation unit, wherein N is a positive integer not less than 2. In the application, a first carrier modulation unit generates a synchronous signal, an ith carrier modulation unit receives the synchronous signal through a hard wiring, i is more than or equal to 2 and less than or equal to N, when the first carrier modulation unit generates the synchronous signal, a first modulated signal obtained by modulating the carrier signal by itself is sent to a receiving unit which is in one-to-one correspondence with the ith carrier modulation unit, when the ith carrier modulation unit receives the synchronous signal, an ith modulated signal obtained by modulating the carrier signal by itself is sent to a receiving unit which is in one-to-one correspondence with the ith carrier modulation unit, because the transmission time of the synchronous signal in the hard wiring is extremely short, the transmission delay is only ns level and can be almost ignored, therefore, the transmission of the modulated signals by each carrier modulation unit based on the synchronous signal can be basically carried out simultaneously, and the influence of jitter phenomena on the receiving unit is reduced to a certain extent.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a carrier modulation apparatus.
Background
In the process of carrier modulation, in order to meet the requirement of system capacity and make the system more flexible to build, a distributed mode is usually adopted to build a carrier modulation device, that is, a plurality of independent carrier modulation units are arranged in the carrier modulation device, each carrier modulation unit can independently generate and modulate a carrier, modulated signals are obtained, and the modulated signals are sent to a receiving unit, so that the receiving unit can further process the modulated signals. For example, the receiving unit may be a power module such as a DCDC (Direct current-Direct current) module, and the modulated signal may be a PWM (Pulse width modulation) signal, so that a controllable switch in the DCDC module may be controlled by the PWM signal.
When the receiving units are connected in series or in parallel, the synchronization requirements for the modulated signal are very high. However, because the distributed manner employs a plurality of independent carrier modulation units, when each carrier modulation unit is started, the power-on time of each carrier modulation unit is different, so that the time for establishing communication between each carrier modulation unit and the receiving unit is not uniform, the signal transmission between each carrier modulation unit and the receiving unit is difficult to synchronize, and the asynchronization phenomenon is called as a jitter phenomenon, thereby possibly affecting the normal operation of the receiving unit.
Disclosure of Invention
The invention aims to provide a carrier modulation device which can play a role in signal synchronous transmission between a plurality of carrier modulation units and receiving units corresponding to the carrier modulation units one by one, thereby reducing the influence of jitter on the receiving units.
In order to solve the above technical problem, the present invention provides a carrier modulation apparatus, which includes a first carrier modulation unit, a second carrier modulation unit, and up to an nth carrier modulation unit, where N is a positive integer not less than 2;
the first carrier modulation unit is used for modulating a carrier signal to obtain a first modulated signal; generating a synchronous signal, and sending the first modulated signal to the receiving units corresponding to the first modulated signal one by one when the synchronous signal is generated;
the ith carrier modulation unit is used for modulating the carrier signal to obtain an ith modulated signal; and when the synchronization signal is received through a hard wire, transmitting the ith modulated signal to the receiving units corresponding to the ith modulated signal one by one, wherein i is more than or equal to 2 and less than or equal to N.
Preferably, the transmitting the first modulated signal to the receiving units corresponding to each other one to one when generating the synchronization signal includes:
when the rising edge of the synchronous signal is generated, the first modulated signal is sent to the receiving units which are in one-to-one correspondence with the first modulated signal;
transmitting the ith modulated signal to a receiving unit corresponding to itself one to one when the synchronization signal is received through hard wiring, including:
and when the rising edge of the synchronous signal is received through hard wiring, the ith modulated signal is sent to the receiving units corresponding to the ith modulated signal one by one.
Preferably, the ith carrier modulation unit is connected with the first carrier modulation unit through hard wiring, and i is more than or equal to 2 and less than or equal to N;
transmitting the ith modulated signal to a receiving unit corresponding to itself one to one when the synchronization signal is received through hard wiring, including:
and when the synchronization signal sent by the first carrier modulation unit is received through hard wiring, the ith modulated signal is sent to the receiving units corresponding to the ith modulated signal one by one.
Preferably, the ith carrier modulation unit is connected with the (i-1) th carrier modulation unit through hard wiring, and i is more than or equal to 2 and less than or equal to N;
the jth carrier modulation unit is further configured to receive the synchronization signal transmitted by the jth-1 carrier modulation unit through a hard-wired line, and then forward the synchronization signal to the jth +1 carrier modulation unit through a hard-wired line, where j is greater than or equal to 2 and is less than or equal to N-1;
transmitting the ith modulated signal to its one-to-one corresponding receiving unit upon receiving the synchronization signal through hard wiring, comprising:
and when the synchronization signals transmitted by the i-1 carrier modulation unit are received through hard wiring, the i modulated signals are sent to the receiving units corresponding to the i-1 modulated signals one by one.
Preferably, the nth carrier modulation unit is further connected to the first carrier modulation unit through hard wiring, and is further configured to forward the synchronization signal to the first carrier modulation unit;
the kth carrier modulation unit is also used for judging whether the synchronous signal of the current time is received within the monitoring time after the synchronous signal is received last time, if so, fault protection action is carried out, and k is more than or equal to 1 and less than or equal to N;
the synchronization period of the synchronization signal is less than the monitoring time is less than 2 times the synchronization period of the synchronization signal.
Preferably, the monitoring time is 1.5 times the synchronization period of the synchronization signal.
Preferably, the fault protection action comprises:
and stopping sending the k-th modulated signal to the receiving units corresponding to the k-th modulated signal one by one.
Preferably, the method further comprises the following steps:
an alarm unit;
the kth carrier modulation unit is also used for controlling the alarm unit to give an alarm when judging that the synchronous signal of the current time is not received in the monitoring time after the synchronous signal is received last time.
Preferably, the alarm unit is an audio alarm unit and/or a display alarm unit.
Preferably, the sound alarm unit is a buzzer, and the display alarm unit is an indicator lamp.
Preferably, the hard-wired line is an optical fiber.
Preferably, the number of external interfaces used for transmitting the synchronization signal and the kth modulated signal in the kth carrier modulation unit is multiple, and k is greater than or equal to 1 and less than or equal to N.
Preferably, the external interface includes a TX interface and an RX interface.
Preferably, the kth carrier modulation unit is further configured to generate the carrier signal, where k is greater than or equal to 1 and less than or equal to N.
Preferably, the method further comprises the following steps:
the control unit is respectively connected with the N carrier modulation units and is used for generating the carrier signal;
the k carrier modulation unit is also used for carrying out carrier synchronization on the carrier signals, and k is more than or equal to 1 and less than or equal to N.
The invention provides a carrier modulation device which comprises a first carrier modulation unit, a second carrier modulation unit and an Nth carrier modulation unit, wherein N is a positive integer not less than 2. In the application, a first carrier modulation unit generates a synchronous signal, an ith carrier modulation unit receives the synchronous signal through a hard wiring, i is more than or equal to 2 and less than or equal to N, when the first carrier modulation unit generates the synchronous signal, a first modulated signal obtained by modulating the carrier signal by itself is sent to a receiving unit which is in one-to-one correspondence with the ith carrier modulation unit, when the ith carrier modulation unit receives the synchronous signal, an ith modulated signal obtained by modulating the carrier signal by itself is sent to a receiving unit which is in one-to-one correspondence with the ith carrier modulation unit, because the transmission time of the synchronous signal in the hard wiring is extremely short, the transmission delay is only ns level and can be almost ignored, therefore, the transmission of the modulated signals by each carrier modulation unit based on the synchronous signal can be basically carried out simultaneously, and the influence of jitter phenomena on the receiving unit is reduced to a certain extent.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed in the prior art and the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a carrier modulation apparatus provided in the present invention;
FIG. 2 is a schematic diagram of jitter phenomenon in signal transmission caused by asynchronous power-on of each carrier modulation unit;
FIG. 3 is a schematic diagram of hard-wired transmission delay of a synchronization signal;
FIG. 4 is a diagram illustrating synchronous transmission of a modulated signal using a synchronization signal;
FIG. 5 is a diagram illustrating a fault protection process performed at the time of a fault in the prior art;
FIG. 6 is a schematic diagram of accumulated errors introduced by clock differences of the carrier modulation units;
FIG. 7 is a schematic diagram illustrating carrier phase shift uncertainty caused by accumulated error;
FIG. 8 is a schematic diagram of the hardwired delay of the carrier received by each carrier modulation unit;
fig. 9 is a schematic diagram of accumulated errors after carriers are uniformly generated by the main control unit;
fig. 10 is a schematic diagram of carrier phase shift after carrier synchronization is performed by the carrier modulation unit.
Detailed Description
The core of the invention is to provide a carrier modulation device which can play a role of signal synchronous transmission between a plurality of carrier modulation units and receiving units corresponding to the carrier modulation units one by one, thereby reducing the influence of jitter phenomena on the receiving units.
In order to make the objects, 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 drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that i, j, k referred to in this specification are positive integers, and their corresponding value ranges are respectively i ≦ N and 2 ≦ j ≦ N, N ≦ N-1, k ≦ N and 1 ≦ N, where N is the number of carrier modulation units in the carrier modulation device disclosed in this application, and N is a positive integer not less than 2.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a carrier modulation apparatus provided in the present invention.
The carrier modulation device comprises a first carrier modulation unit PRU1, a second carrier modulation unit PRU2 and an Nth carrier modulation unit PRUN, wherein N is a positive integer not less than 2;
the first carrier modulation unit PRU1 is used for modulating a carrier signal to obtain a first modulated signal; generating a synchronous signal, and sending the first modulated signal to the receiving units which are in one-to-one correspondence with the first modulated signal when the synchronous signal is generated;
the ith carrier modulation unit is used for modulating the carrier signal to obtain an ith modulated signal; and when the synchronization signal is received through the hard wiring, the ith modulated signal is sent to the receiving units corresponding to the ith modulated signal one by one, and i is more than or equal to 2 and less than or equal to N.
In this embodiment, the carrier modulation apparatus includes N carrier modulation units, that is, a first carrier modulation unit PRU1, a second carrier modulation unit PRU2, and up to an nth carrier modulation unit PRUN, where N is a positive integer not less than 2. Each carrier modulation unit is configured to modulate a carrier signal and obtain a modulated signal after modulation, that is, the first carrier modulation unit PRU1 modulates the carrier signal to obtain a first modulated signal, the ith carrier modulation unit modulates the carrier signal to obtain an ith modulated signal, i is greater than or equal to 2 and is less than or equal to N, where the carrier signal may be generated by each carrier modulation unit itself or obtained by each carrier modulation unit receiving an external carrier signal and performing carrier synchronization, and the present application is not particularly limited. After each carrier modulation unit obtains the modulated signals, the modulated signals can be respectively sent to the receiving units corresponding to the carrier modulation units one by one, so that the receiving units can conveniently perform one-step processing. In an application scenario where the receiving units are connected in series or in parallel, the receiving units respectively connected to the carrier modulation units have very high synchronization requirements for the received modulated signals, and due to differences in power-on time of the carrier modulation units, the time for establishing communication between each carrier modulation unit and its own receiving unit in one-to-one correspondence is not uniform, so that transmission of signals is not synchronous, a jitter phenomenon occurs, and the high synchronization requirements for transmitting the modulated signals between each carrier modulation unit and its own receiving unit in one-to-one correspondence cannot be met, specifically, refer to fig. 2, which is a schematic diagram of a jitter phenomenon in signal transmission caused by asynchronous power-on of each carrier modulation unit.
Specifically, in the present application, any one of the carrier modulation units, for example, the first carrier modulation unit PRU1, may be configured to generate a synchronization signal, where the synchronization signal is periodically generated by the first carrier modulation unit PRU1, and may be, but is not limited to, a square wave signal, and a synchronization period of the synchronization signal may be specifically set according to a transmission time of the modulated signal, for example, in the present application, setting a frequency of the synchronization signal to be 1MHZ, and then setting a period of the synchronization signal to be 1 μ s; after the first carrier modulation unit PRU1 generates the synchronization signal, the i-th carrier modulation unit receives the carrier signal through hard wiring, i is greater than or equal to 2 and less than or equal to N, since the time for the synchronization signal to be transmitted in the hard wiring is very short, and the transmission delay is only in the ns level, as shown in fig. 3, fig. 3 is a schematic diagram of the delay of the hard wiring transmission of the synchronization signal, it can be seen from fig. 3 that the time from the generation of the synchronization signal by the first carrier modulation unit PRU1 to the reception of the synchronization signal by the i-th carrier modulation unit is only a few ns and can be almost ignored, therefore, the present application performs the transmission of the modulated signal based on the synchronization signal, specifically, when the first carrier generation unit generates the synchronization signal, the first modulated signal is transmitted to the reception unit corresponding to itself one to one, when the i-th carrier modulation unit receives the synchronization signal, the i-th modulated signal is transmitted to the reception unit corresponding to itself one to one, and thus the time delay of the modulated signal transmitted by each carrier modulation unit to its own reception unit can be basically performed synchronously, thereby ensuring the normal operation of the reception unit, specifically, it can be omitted by using the schematic diagram of the synchronization signal transmitted by fig. 4.
In summary, in this embodiment, a synchronization signal is generated by the first carrier modulation unit PRU1, the ith carrier modulation unit receives the synchronization signal through hard wiring, and each carrier modulation unit transmits a modulated signal based on the synchronization signal.
On the basis of the above-described embodiment:
as a preferred embodiment, the method for transmitting the first modulated signal to its own receiving units in one-to-one correspondence when generating the synchronization signal includes:
when the rising edge of the synchronous signal is generated, the first modulated signal is sent to the receiving units corresponding to the first modulated signal one by one;
a receiving unit for transmitting an ith modulated signal to itself in one-to-one correspondence when receiving a synchronization signal through hard wiring, comprising:
and transmitting the ith modulated signal to the receiving units corresponding to the ith modulated signal one by one when the rising edge of the synchronous signal is received through hard wiring.
In this embodiment, for the first carrier modulation unit PRU1, when generating the synchronization signal, the first carrier modulation unit PRU1 sends the first modulated signal to its one-to-one corresponding receiving unit, specifically, it may be set that the first carrier modulation unit PRU1 sends the first modulated signal when generating the rising edge of the synchronization signal, and then the corresponding ith carrier modulation unit sends the ith modulated signal to its one-to-one corresponding receiving unit when receiving the rising edge of the synchronization signal, so as to implement that each carrier modulation unit sends the modulated signal when generating the rising edge of the synchronization signal.
Of course, each carrier modulation unit may also transmit the modulated signal based on the falling edge of the synchronization signal, and the application is not limited thereto.
Therefore, each carrier modulation unit sends the modulated signal based on the rising edge of the synchronous signal, the synchronism of the modulated signal transmission can be guaranteed, the logic is clear, and the realization is convenient.
As a preferred embodiment, the ith carrier modulation unit is connected with the first carrier modulation unit PRU1 by hard wiring, i is greater than or equal to 2 and less than or equal to N;
transmitting the ith modulated signal to its one-to-one corresponding receiving unit upon receiving the synchronization signal through hard wiring, comprising:
when receiving the synchronization signal transmitted by the first carrier modulation unit PRU1 through hard wiring, the ith modulated signal is transmitted to the receiving unit corresponding to itself one by one.
In this embodiment, the ith carrier modulation unit is directly connected to the first carrier modulation unit PRU1, and the ith carrier modulation unit can directly receive the synchronization signal generated by the first carrier modulation unit PRU1, and the connection relationship of the connection manner is simple, and the ith carrier modulation unit can quickly obtain the synchronization signal generated by the first carrier modulation unit PRU 1.
As a preferred embodiment, the ith carrier modulation unit is connected with the ith-1 carrier modulation unit through hard wiring, and i is more than or equal to 2 and less than or equal to N;
the jth carrier modulation unit is also used for receiving the synchronization signal transmitted by the jth-1 carrier modulation unit through a hard wire and then forwarding the synchronization signal to the jth +1 carrier modulation unit through the hard wire, wherein j is more than or equal to 2 and is less than or equal to N-1;
transmitting the ith modulated signal to its one-to-one corresponding receiving unit upon receiving the synchronization signal through hard wiring, comprising:
and when the synchronization signals transmitted by the i-1 carrier modulation unit are received through hard wiring, the i modulated signals are sent to the receiving units corresponding to the i-1 modulated signals one by one.
In this embodiment, the ith carrier modulation unit is connected with the (i-1) th carrier modulation unit through hard wiring, and by adopting the connection mode, the first carrier modulation unit PRU1, the second carrier modulation unit PRU2 and the nth carrier modulation unit PRUN are sequentially connected to form a linear structure, and after the first carrier modulation unit PRU1 generates a synchronization signal, the synchronization signal is received by the jth carrier modulation unit and then forwarded to the (j + 1) th carrier modulation unit, so that the ith carrier modulation unit can receive the synchronization signal through the forwarding of the last adjacent carrier modulation unit and send the ith modulated signal to the receiving units corresponding to the ith modulation unit one by one based on the synchronization signal. The adoption of the connection mode reduces the occupation of the interface and has simpler connection mode.
Of course, in addition to the above two connection methods, other connection methods may be adopted, so that all the ith carrier modulation units may directly or indirectly receive the synchronization signal, and the present application is not limited in particular herein.
As a preferred embodiment, the nth carrier modulation unit PRUN is further connected with the first carrier modulation unit PRU1 by hard wiring, and is further configured to forward the synchronization signal to the first carrier modulation unit PRU1;
the kth carrier modulation unit is also used for judging whether the current synchronous signal is received within the monitoring time after the synchronous signal is received last time, if so, fault protection action is carried out, and k is more than or equal to 1 and less than or equal to N;
the synchronization period of the synchronization signal < the monitoring time < 2 times the synchronization period of the synchronization signal.
In this embodiment, considering that each carrier modulation unit may malfunction during operation, that is, a link for transmitting a synchronization signal is abnormal, which causes asynchronous transmission of modulated signals to its own receiving units, which corresponds to the carrier modulation unit one to one, and affects normal operation of the receiving units, please refer to fig. 5, where fig. 5 is a schematic diagram of a fault protection process performed at the time of a fault in the prior art, as can be seen from the diagram, when a certain carrier modulation unit or certain carrier modulation units malfunctions, the faulty carrier modulation unit feeds back fault information to a control unit, and the control unit performs a fault protection action according to the fault information.
Specifically, on the basis that the first carrier modulation unit PRU1, the second carrier modulation unit PRU2, and up to the nth carrier modulation unit PRUN are connected in sequence to form a linear structure, the nth carrier modulation unit PRUN is connected back to the first carrier modulation unit PRU1 through hard wiring, so as to form a ring topology structure connected in sequence from head to tail, at this time, after receiving the synchronization signal forwarded by the nth-1 carrier modulation unit, the nth carrier modulation unit PRUN forwards the synchronization signal to the first carrier modulation unit PRU1 again, so that the synchronization signal is generated in the first carrier modulation unit PRU1 and then circularly transmitted through each ith carrier modulation unit and finally returned to the first carrier modulation unit. After the structure of the ring topology is adopted, if the first carrier modulation unit PRU1 fails, the synchronous signal cannot be generated, and each carrier modulation unit cannot receive the synchronous signal; if the ith carrier modulation unit fails, the i +1 th carrier modulation unit after the ith carrier modulation unit until the nth carrier modulation unit PRUN cannot receive the synchronization signal, so that the first carrier modulation unit PRU1 cannot receive the synchronization signal transmitted back through the ring topology, and at this time, the first carrier modulation unit PRU1 can actively cancel the transmission of the synchronization signal, and each carrier modulation unit cannot receive the synchronization signal.
Therefore, in the present application, the kth carrier modulation unit is further configured to determine whether the synchronization signal of this time is received within a monitoring time after the synchronization signal is received last time, where k is greater than or equal to 1 and less than or equal to N, and if so, perform a fault protection operation, where the monitoring time is set based on a synchronization cycle of the synchronization signal, specifically, a synchronization cycle of the synchronization signal is less than a synchronization cycle of the monitoring time and less than 2 times of the synchronization cycle of the synchronization signal, and for example, if the synchronization cycle of the synchronization signal is 1 μ s, 1 μ s is less than the monitoring time and less than 2 μ s, and thus setting a range of the monitoring time enables each carrier debugging unit to perform fault protection quickly when the synchronization signal is not received.
As can be seen, in this embodiment, by using such a connection manner of a ring topology and setting the monitoring time of the kth carrier modulation unit, a fast protection operation at the time of a failure can be implemented.
As a preferred embodiment, the monitoring time is 1.5 times the synchronization period of the synchronization signal.
It can be seen from the above embodiments that the monitoring time range is set to be the synchronization cycle of the synchronization signal whose synchronization cycle < monitoring time < 2 times, and in this range, the monitoring time is specifically set to be 1.5 times of the synchronization cycle of the synchronization signal, and if the kth carrier modulation unit does not receive the synchronization signal within the monitoring time of 1.5 times of the synchronization cycle of the synchronization signal, it is determined that an abnormality occurs in the link for transmitting the synchronization signal, and at this time, a protection action should be taken in time to prevent the normal operation of the receiving unit from being affected. Therefore, the monitoring time of the synchronization period of the synchronization signal which is set to be 1.5 times is set, the response is sensitive, and the influence of signal fluctuation is small.
As a preferred embodiment, performing a failsafe action includes:
and stopping sending the k modulated signal to the receiving units corresponding to the k modulated signal one by one.
As can be seen from the foregoing embodiments, for the carrier modulation apparatus provided in the present application, when the carrier modulation units are sequentially connected end to end through hard wiring to form a ring topology structure, the kth carrier modulation unit may determine whether the current synchronization signal is received within the monitoring time after the synchronization signal is received last time, so as to determine whether a transmission link of the synchronization signal is abnormal, and can quickly perform a protection action after the abnormality occurs. Specifically, considering that each carrier modulation unit transmits modulated signals to its own one-to-one corresponding receiving unit asynchronously due to an abnormal transmission link, which may affect the normal operation of the receiving unit, the kth carrier modulation unit immediately stops transmitting modulated signals to its own one-to-one corresponding receiving unit at the time when the abnormal transmission link of the synchronous signal occurs, thereby avoiding the influence of the asynchronous modulated signals on the receiving unit, and simultaneously ensuring the normal operation of other functions of the carrier modulation device. Of course, the kth carrier modulation unit can also realize fault protection by taking a power-off measure at the fault moment, and how to perform the fault protection action is not particularly limited in the present application.
As a preferred embodiment, further comprising:
an alarm unit;
the kth carrier modulation unit is also used for controlling the alarm unit to give an alarm when judging that the current synchronous signal is not received in the monitoring time after the synchronous signal is received last time.
In order to prompt relevant personnel in time when a transmission link of a synchronous signal fails so as to facilitate subsequent maintenance of the relevant personnel, the alarm unit is arranged for the carrier modulation device and can be connected with any one of the carrier modulation units, and when the transmission link of the synchronous signal fails, the corresponding carrier modulation unit controls the alarm unit to give an alarm.
In the application, the alarm unit is arranged, so that the alarm prompt of related personnel is realized when the transmission link of the synchronous signal breaks down, and the related personnel can timely perform subsequent maintenance work.
As a preferred embodiment, the alarm unit is an audible alarm unit and/or a display alarm unit.
On the basis of the above embodiment, the alarm unit may specifically adopt a sound alarm unit and/or a display alarm unit. The voice alarm unit can send out voice alarm at the fault moment in time, and can set the intensity and the urgency degree of alarm voice according to the severity degree of the fault, so that related personnel can be prompted whether the fault is urgent to be processed, and the grade of the fault can be directly broadcasted in a voice broadcast mode; of course, the display alarm unit may also be used to display the fault, and as for the alarm prompting mode, one of the alarm prompting modes may be used alone, or a combination of multiple alarm prompting modes may be used, which is not limited herein.
As a preferred embodiment, the sound alarm unit is a buzzer, and the display alarm unit is an indicator lamp.
In this embodiment, a buzzer is used as the sound alarm unit, and an indicator light is used as the display alarm unit. The buzzer is an electronic buzzer with an integrated structure, can be directly powered by direct-current voltage, and has the characteristics of simple structure, low cost, simple driving mode and the like; the indicating lamp is used as a display alarm unit, the type and the grade of the fault can be timely and accurately reflected according to the number, the luminous color or the brightness and other characteristics of the indicating lamp, and the indicating lamp has the advantages of low cost, convenience in control, wide application range and the like.
Of course, the sound alarm unit is not limited to a buzzer, the display alarm unit is not limited to an indicator light, and the types of the sound alarm unit and the display alarm unit are not particularly limited in the present application.
As a preferred embodiment, the hard wiring is an optical fiber.
In this embodiment, an optical fiber is used as a hard-wired line, and an external interface for transmitting a synchronization signal in each corresponding carrier modulation unit is an optical fiber interface. Specifically, a photoelectric converter is arranged in the carrier modulation unit, the first carrier modulation unit PRU1 generates a synchronization signal, and then converts the electrical signal into an optical signal through the photoelectric converter, and when the ith carrier modulation unit receives the synchronization signal, the optical signal transmitted through the optical fiber is converted into the electrical signal again through the photoelectric converter. The optical fiber has the advantages of wide frequency band, strong anti-interference capability, low loss, high fidelity, reliable working performance and the like, and the transmission delay of the synchronous signals can be further reduced by adopting the optical fiber as a transmission channel of the synchronous signals.
As a preferred embodiment, the number of external interfaces used for transmitting the synchronous signal and the k-th modulated signal in the k-th carrier modulation unit is multiple, and k is more than or equal to 1 and less than or equal to N.
In the kth carrier modulation unit, a plurality of external interfaces for transmitting the synchronization signal and the kth modulated signal can be set according to the system capacity and the connection mode among the carrier modulation units according to the requirements, and the number of the external interfaces can be freely increased or decreased according to budget and cost, so that the requirement of signal transmission is met on the premise of maximally utilizing the external interfaces.
As a preferred embodiment, the external interfaces include a TX interface and an RX interface.
In this embodiment, the external interface is composed of a TX interface and an RX interface. As an interface for full-duplex signal transmission, the external interface can transmit and receive signals simultaneously, that is, realize bidirectional transmission of signals. For the carrier modulation device disclosed in the present application, the connection manner between the N carrier modulation units is, for example, the above-mentioned ith carrier modulation unit is connected with the i-1 th carrier modulation unit through hard wiring, and the jth carrier modulation unit is required to receive the synchronization signal transmitted by the jth-1 th carrier modulation unit and forward the synchronization signal to the jth +1 th carrier modulation unit, so that when the external interface of the full-duplex manner is adopted, the synchronization signal can be simultaneously received and transmitted, the transmission delay of the synchronization signal is further reduced, and the synchronization of the k-th carrier modulation unit transmitting the modulated signals to the receiving units corresponding to the k-th carrier modulation unit one to one can be further improved.
As a preferred embodiment, the kth carrier modulation unit is further configured to generate a carrier signal.
In this embodiment, a carrier signal is generated by a carrier generator in the kth carrier modulation unit, and the generated carrier modulation signal is directly modulated in the kth carrier modulation unit to generate a modulated signal. By adopting the mode, no additional carrier generation device is needed, and the carrier can be obtained and modulated only by using the carrier generator of each carrier modulation unit.
As a preferred embodiment, the method further comprises the following steps:
the control unit is respectively connected with the N carrier modulation units and is used for generating the carrier signal;
the kth carrier modulation unit is further configured to perform carrier synchronization on the carrier signal.
Referring to fig. 6 and 7, fig. 6 is a schematic diagram of an accumulated error introduced by a clock difference of each carrier modulation unit, and fig. 7 is a schematic diagram of an uncertain phase shift of a carrier caused by the accumulated error.
The problem that when each carrier modulation unit generates a carrier signal by itself, the carrier generators in each carrier modulation unit have clock differences, and the clock differences are accumulated to form clock accumulation errors, so that the carrier signals generated by each carrier modulation unit have uncertain phase shifts, carriers generated by each carrier modulation unit are not synchronous, a system is diverged, and modulated signals after being modulated are not synchronous is solved.
Specifically, the generation of the carrier wave is moved upwards to the control units which are respectively connected with the carrier wave modulation units, the carrier wave generators in the control units uniformly generate the carrier wave, the carrier wave is respectively sent to the carrier wave modulation units through hard wiring, and the carrier wave modulation units carry out carrier wave synchronization based on the carrier wave, so that local oscillation with the same frequency and phase as the carrier wave is generated in the carrier wave modulation units. Referring to fig. 8, fig. 8 is a schematic diagram illustrating hard-wired delay of carriers received by each carrier modulation unit. After the carrier is generated by the control unit, the delay level of transmission delay transmitted to each carrier modulation unit through hard wiring is only 1-2ns, and is influenced by the main clock of each carrier modulation unit, the theoretical phase deviation of the carrier generated after each carrier modulation unit is influenced by the internal main clock when the carrier modulation unit carries out carrier synchronization is only +/-20 ns, and the clock accumulated error in 100us can be ignored if the carrier period is 10 kHz. Referring to fig. 9 and 10, fig. 9 is a schematic diagram of an accumulated error after the master control unit generates the carriers uniformly, fig. 10 is a schematic diagram of a carrier phase shift after the carrier modulation units perform carrier synchronization, and as can be seen from fig. 9 and 10, a phase deviation of the carrier generated after the master control unit generates the carriers uniformly and the carrier modulation units perform carrier synchronization can be substantially ignored.
Therefore, the generation of the carrier waves is moved up to the main control unit, each carrier wave modulation unit carries out carrier wave synchronization based on the carrier waves generated by the main control unit, the carrier wave sources are the same, the carrier wave delay level of each carrier wave modulation unit after the transmission through hard wiring is very small, the clock accumulated error can be ignored after the carrier wave synchronization is carried out by each carrier wave modulation unit, and the low-delay carrier wave synchronization is realized.
It is to be noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable 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 applied to other embodiments without departing from the spirit or scope of the 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 (15)
1. A carrier modulation device is characterized by comprising a first carrier modulation unit, a second carrier modulation unit and an Nth carrier modulation unit, wherein N is a positive integer not less than 2;
the first carrier modulation unit is used for modulating a carrier signal to obtain a first modulated signal; generating a synchronous signal, and sending the first modulated signal to the receiving units which are in one-to-one correspondence with the first modulated signal when the synchronous signal is generated;
the ith carrier modulation unit is used for modulating the carrier signal to obtain an ith modulated signal; and when the synchronous signal is received through hard wiring, the ith modulated signal is sent to the receiving units corresponding to the ith modulated signal one by one, wherein i is more than or equal to 2 and less than or equal to N.
2. The carrier modulation apparatus according to claim 1, wherein the receiving unit that transmits the first modulated signal to itself in one-to-one correspondence when generating the synchronization signal comprises:
when the rising edge of the synchronous signal is generated, the first modulated signal is sent to the receiving units which are in one-to-one correspondence with the first modulated signal;
transmitting the ith modulated signal to a receiving unit corresponding to itself one to one when the synchronization signal is received through hard wiring, including:
and when the rising edge of the synchronous signal is received through hard wiring, the ith modulated signal is sent to the receiving units corresponding to the ith modulated signal one by one.
3. The carrier modulation device according to claim 1, wherein the ith carrier modulation unit is connected to the first carrier modulation unit by hard wiring, and 2 ≦ i ≦ N;
transmitting the ith modulated signal to its one-to-one corresponding receiving unit upon receiving the synchronization signal through hard wiring, comprising:
and when the synchronization signal sent by the first carrier modulation unit is received through hard wiring, the ith modulated signal is sent to the receiving units corresponding to the ith modulated signal one by one.
4. The carrier modulation device according to claim 1, wherein the ith carrier modulation unit is connected with the (i-1) th carrier modulation unit through hard wiring, i is greater than or equal to 2 and less than or equal to N;
the jth carrier modulation unit is also used for forwarding the synchronous signal to the jth +1 carrier modulation unit through a hard wire after receiving the synchronous signal transmitted by the jth-1 carrier modulation unit through the hard wire, wherein j is more than or equal to 2 and less than or equal to N-1;
transmitting the ith modulated signal to a receiving unit corresponding to itself one to one when the synchronization signal is received through hard wiring, including:
and when the synchronization signals transmitted by the i-1 carrier modulation unit are received through hard wiring, the i-th modulated signals are sent to the receiving units corresponding to the i-th modulated signals one by one.
5. The carrier modulation device according to claim 4, wherein the nth carrier modulation unit is further connected to the first carrier modulation unit by hard wiring, and is further configured to forward the synchronization signal to the first carrier modulation unit;
the kth carrier modulation unit is also used for judging whether the synchronous signal of the current time is received within the monitoring time after the synchronous signal is received last time, if so, fault protection action is carried out, and k is more than or equal to 1 and less than or equal to N;
the synchronization period of the synchronization signal is less than the monitoring time is less than 2 times the synchronization period of the synchronization signal.
6. The carrier modulation device according to claim 5, wherein the monitoring time is 1.5 times a synchronization period of the synchronization signal.
7. The carrier modulation apparatus according to claim 5, wherein the performing of the fault protection action includes:
and stopping sending the k modulated signal to the receiving units corresponding to the k modulated signal one by one.
8. The carrier modulation device according to claim 5, further comprising:
an alarm unit;
the k carrier modulation unit is also used for controlling the alarm unit to give an alarm when judging that the synchronous signal of the current time is not received in the monitoring time after the synchronous signal is received last time.
9. The carrier modulation device according to claim 8, wherein the alarm unit is an audio alarm unit and/or a display alarm unit.
10. The carrier modulation device according to claim 9, wherein the sound alarm unit is a buzzer, and the display alarm unit is an indicator lamp.
11. The carrier modulation device of claim 1 wherein the hard-wired line is an optical fiber.
12. The carrier modulation apparatus according to claim 1, wherein the k-th carrier modulation unit has a plurality of external interfaces for transmitting the synchronization signal and the k-th modulated signal, and k is greater than or equal to 1 and less than or equal to N.
13. The carrier modulation device of claim 12 wherein the external interface comprises a TX interface and an RX interface.
14. The carrier modulation device according to claim 1, wherein the kth carrier modulation unit is further configured to generate the carrier signal, where k is greater than or equal to 1 and less than or equal to N.
15. The carrier modulation device according to any one of claims 1 to 13, characterized by further comprising:
the control unit is respectively connected with the N carrier modulation units and is used for generating the carrier signal;
the kth carrier modulation unit is also used for carrying out carrier synchronization on the carrier signals, and k is more than or equal to 1 and less than or equal to N.
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|---|---|---|---|
| CN202110882421.1A CN115701696A (en) | 2021-08-02 | 2021-08-02 | Carrier modulation device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110882421.1A CN115701696A (en) | 2021-08-02 | 2021-08-02 | Carrier modulation device |
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| CN115701696A true CN115701696A (en) | 2023-02-10 |
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| CN202110882421.1A Pending CN115701696A (en) | 2021-08-02 | 2021-08-02 | Carrier modulation device |
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