A carrier modulation device

Abstract

The present invention discloses a carrier modulation device, comprising a first carrier modulation unit, a second carrier modulation unit, and up to an N-th carrier modulation unit, where N is a positive integer not less than 2. In the present application, the first carrier modulation unit generates a synchronization signal, and the i-th carrier modulation unit receives the synchronization signal through hard wiring, 2≤i≤N, and when the first carrier modulation unit generates the synchronization signal, it sends a first modulated signal obtained by modulating the carrier signal to a receiving unit corresponding to itself one by one, and when the i-th carrier modulation unit receives the synchronization signal, it sends an i-th modulated signal obtained by modulating the carrier signal to a receiving unit corresponding to itself one by one, because the transmission time of the synchronization signal in the hard wiring is extremely short, the transmission delay is only at the ns level, which is almost negligible, so each carrier modulation unit can basically transmit the modulated signal based on the synchronization signal at the same time, which reduces the influence of the jitter phenomenon on the receiving unit to a certain extent.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a carrier modulation device. Background Art

[0002] In the process of carrier modulation, in order to meet the needs of system capacity and make the system construction more flexible, a distributed carrier modulation device is usually constructed, that is, multiple independent carrier modulation units are set in the carrier modulation device, and each carrier modulation unit can independently generate and modulate the carrier to obtain a modulated signal, and send the modulated signal to the receiving unit, so that the receiving unit can further process the modulated signal. For example, the receiving unit here can be a power module such as a DCDC (Direct current-Direct current, DC-DC) module, and the modulated signal can be a PWM (Pulse width modulation, pulse width modulation) signal, so that the controllable switch in the DCDC module can be controlled by the PWM signal.

[0003] When the receiving units are connected in series or in parallel, the synchronization requirements for the modulated signal are very high. However, since this distributed method uses multiple independent carrier modulation units, the power-on time of each carrier modulation unit is different when it is started, which leads to the time for each carrier modulation unit to establish communication with the receiving unit is not uniform, and the signal transmission between each carrier modulation unit and the receiving unit is difficult to synchronize. This phenomenon of asynchrony is called jitter, which may affect the normal operation of the receiving unit. Summary of the invention

[0004] The object of the present invention is to provide a carrier modulation device, which can play a role in synchronous transmission of signals between multiple carrier modulation units and their one-to-one corresponding receiving units, thereby reducing the impact of jitter on the receiving units.

[0005] In order to solve the above technical problems, the present invention provides a carrier modulation device, comprising a first carrier modulation unit, a second carrier modulation unit, and an Nth carrier modulation unit, where N is a positive integer not less than 2;

[0006] The first carrier modulation unit is used to modulate the carrier signal to obtain a first modulated signal; generate a synchronization signal, and send the first modulated signal to the receiving unit corresponding to itself one by one when generating the synchronization signal;

[0007] The i-th carrier modulation unit is used to modulate the carrier signal to obtain the i-th modulated signal; when the synchronization signal is received through hard wiring, the i-th modulated signal is sent to the one-to-one corresponding receiving unit, 2≤i≤N.

[0008] Preferably, when generating the synchronization signal, sending the first modulated signal to a receiving unit corresponding to itself one by one includes:

[0009] When generating a rising edge of a synchronization signal, sending the first modulated signal to a receiving unit corresponding to the first modulated signal;

[0010] When the synchronization signal is received through hard wiring, the i-th modulated signal is sent to a receiving unit corresponding to itself, comprising:

[0011] When the rising edge of the synchronization signal is received through hard wiring, the i-th modulated signal is sent to the receiving unit corresponding to itself.

[0012] Preferably, the i-th carrier modulation unit is connected to the first carrier modulation unit via hard wiring, 2≤i≤N;

[0013] When the synchronization signal is received through hard wiring, the i-th modulated signal is sent to a receiving unit corresponding to itself, comprising:

[0014] When the synchronization signal sent by the first carrier modulation unit is received through hard wiring, the i-th modulated signal is sent to the receiving unit corresponding to itself.

[0015] Preferably, the i-th carrier modulation unit is connected to the i-1-th carrier modulation unit by hard wiring, 2≤i≤N;

[0016] The j-th carrier modulation unit is further configured to forward the synchronization signal to the j+1-th carrier modulation unit through hard wiring after receiving the synchronization signal transmitted by the j-1-th carrier modulation unit through hard wiring, 2≤j≤N-1;

[0017] When the synchronization signal is received through hard wiring, the i-th modulated signal is sent to a receiving unit corresponding to itself, comprising:

[0018] When the synchronization signal transmitted by the (i-1)th carrier modulation unit is received through hard wiring, the (i)th modulated signal is sent to the receiving unit corresponding to itself.

[0019] Preferably, the Nth carrier modulation unit is also connected to the first carrier modulation unit via hard wiring, and is also used to forward the synchronization signal to the first carrier modulation unit;

[0020] The k-th carrier modulation unit is also used to determine whether the current synchronization signal is received within the monitoring time after the last synchronization signal is received, and if so, perform a fault protection action, 1≤k≤N;

[0021] The synchronization period of the synchronization signal < the monitoring time < 2 times the synchronization period of the synchronization signal.

[0022] Preferably, the monitoring time is 1.5 times the synchronization period of the synchronization signal.

[0023] Preferably, performing a fault protection action includes:

[0024] Stop sending the kth modulated signal to the receiving units corresponding to itself one by one.

[0025] Preferably, it also includes:

[0026] Alarm unit;

[0027] The kth carrier modulation unit is further used to control the alarm unit to issue an alarm when it is determined that the current synchronization signal is not received within the monitoring time after the synchronization signal was received last time.

[0028] Preferably, the alarm unit is a sound alarm unit and / or a display alarm unit.

[0029] Preferably, the sound alarm unit is a buzzer, and the display alarm unit is an indicator light.

[0030] Preferably, the hard wiring is optical fiber.

[0031] Preferably, the k-th carrier modulation unit has multiple external interfaces for transmitting the synchronization signal and the k-th modulated signal, 1≤k≤N.

[0032] Preferably, the external interface includes a TX interface and a RX interface.

[0033] Preferably, the kth carrier modulation unit is also used to generate the carrier signal, 1≤k≤N.

[0034] Preferably, it also includes:

[0035] a control unit connected to the N carrier modulation units respectively, and configured to generate the carrier signal;

[0036] The kth carrier modulation unit is further used to perform carrier synchronization on the carrier signal, 1≤k≤N.

[0037] The present invention provides a carrier modulation device, including 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. In the present application, the first carrier modulation unit generates a synchronization signal, and the i-th carrier modulation unit receives the synchronization signal through hard wiring, 2≤i≤N, and when the first carrier modulation unit generates the synchronization signal, it sends a first modulated signal obtained by modulating the carrier signal to a receiving unit corresponding to itself one by one, and when the i-th carrier modulation unit receives the synchronization signal, it sends an i-th modulated signal obtained by modulating the carrier signal to a receiving unit corresponding to itself one by one, because the transmission time of the synchronization signal in the hard wiring is extremely short, the transmission delay is only at the ns level, which is almost negligible, so each carrier modulation unit can basically transmit the modulated signal based on the synchronization signal at the same time, which reduces the influence of the jitter phenomenon on the receiving unit to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the prior art and the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0039] Figure 1 A structural schematic diagram of a carrier modulation device provided by the present invention;

[0040] Figure 2 A schematic diagram of the signal transmission jitter phenomenon caused by the asynchronous power-on of each carrier modulation unit;

[0041] Figure 3 This is a schematic diagram of the hard-wired transmission delay of the synchronization signal;

[0042] Figure 4 A schematic diagram of realizing synchronous transmission of modulated signals using synchronization signals;

[0043] Figure 5 A schematic diagram of a fault protection process performed at a fault moment in the prior art;

[0044] Figure 6 Schematic diagram of the cumulative error introduced by the clock difference of each carrier modulation unit;

[0045] Figure 7 This is a schematic diagram showing the uncertain phase shift of the carrier caused by the accumulated error;

[0046] Figure 8 A schematic diagram of the hard-wired delay of the carrier received by each carrier modulation unit;

[0047] Fig. 9A schematic diagram of the accumulated error after the main control unit generates the carrier uniformly;

[0048] Fig.10 Schematic diagram of carrier phase shift after carrier modulation unit performs carrier synchronization. DETAILED DESCRIPTION

[0049] The core of the present invention is to provide a carrier modulation device, which can play the role of synchronous signal transmission between multiple carrier modulation units and their one-to-one corresponding receiving units, thereby reducing the impact of jitter on the receiving units.

[0050] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] It should be noted that i, j, and k involved in this specification are all positive integers, and their corresponding value ranges are 2≤i≤N, 2≤j≤N-1, 1≤k≤N, 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.

[0052] Please refer to Figure 1 , Figure 1 A structural schematic diagram of a carrier modulation device provided by the present invention.

[0053] The carrier modulation device includes a first carrier modulation unit PRU1, a second carrier modulation unit PRU2, and an Nth carrier modulation unit PRUN, where N is a positive integer not less than 2;

[0054] The first carrier modulation unit PRU1 is used to modulate the carrier signal to obtain a first modulated signal; generate a synchronization signal, and send the first modulated signal to the receiving unit corresponding to itself one by one when generating the synchronization signal;

[0055] The i-th carrier modulation unit is used to modulate the carrier signal to obtain the i-th modulated signal; when receiving the synchronization signal through hard wiring, the i-th modulated signal is sent to the one-to-one corresponding receiving unit, 2≤i≤N.

[0056] In this embodiment, the carrier modulation device includes N carrier modulation units, namely, a first carrier modulation unit PRU1, a second carrier modulation unit PRU2, and up to the Nth carrier modulation unit PRUN, where N is a positive integer not less than 2. Each carrier modulation unit is used to modulate the carrier signal and obtain a modulated signal after modulation, that is, the first carrier modulation unit PRU1 modulates the carrier signal to obtain the first modulated signal, and the i-th carrier modulation unit modulates the carrier signal to obtain the i-th modulated signal, 2≤i≤N, wherein the carrier signal here can be generated by each carrier modulation unit itself, or can be obtained by each carrier modulation unit receiving an external carrier signal and performing carrier synchronization, which is not specifically limited in this application. After each carrier modulation unit obtains the modulated signal, it can send the modulated signal to its own corresponding receiving unit respectively, so that the receiving unit can perform a further processing. In the application scenario where the receiving units are connected in series or in parallel, the receiving units connected to each carrier modulation unit have very high synchronization requirements for the received modulated signals. However, due to the difference in the power-on time of each carrier modulation unit, the time for each carrier modulation unit to establish communication with its corresponding receiving unit is not uniform, so the signal transmission cannot be synchronized, and jitter occurs. It cannot meet the high synchronization requirements for each carrier modulation unit to transmit the modulated signal with its corresponding receiving unit. For details, please refer to Figure 2 , Figure 2 This is a schematic diagram of the signal transmission jitter phenomenon caused by the asynchronous power-on of each carrier modulation unit.

[0057] Specifically, in the present application, any carrier modulation unit, such as the first carrier modulation unit PRU1, can be set to generate a synchronization signal. The synchronization signal is periodically generated by the first carrier modulation unit PRU1 and can be, but is not limited to, a square wave signal. The synchronization period of the synchronization signal can be specifically set according to the transmission time of the modulated signal. For example, in the present application, the frequency of the synchronization signal is set to 1MHZ, and the period of the synchronization signal is 1μs. After the first carrier modulation unit PRU1 generates the synchronization signal, the i-th carrier modulation unit receives the carrier signal through hard wiring, 2≤i≤N. Since the transmission time of the synchronization signal in the hard wiring is extremely short, the transmission delay is only at the ns level, such as Figure 3 As shown, Figure 3 This is a schematic diagram of the hard-wired transmission delay of the synchronization signal. Figure 3It can be seen that the time from the first carrier modulation unit PRU1 generating a synchronization signal to the i-th carrier modulation unit receiving the synchronization signal is only a few ns, which is almost negligible. Therefore, the present application transmits a modulated signal based on the synchronization signal. Specifically, when the first carrier generation unit generates a synchronization signal, it sends a first modulated signal to the receiving unit corresponding to itself one-to-one. When the i-th carrier modulation unit receives the synchronization signal, it sends an i-th modulated signal to the receiving unit corresponding to itself one-to-one. Therefore, the time delay for each carrier modulation unit to send a modulated signal to the receiving unit corresponding to itself one-to-one is basically negligible, and it is carried out synchronously, thereby ensuring the normal operation of the receiving unit. For details, please refer to Figure 4 , Figure 4 This is a schematic diagram of using a synchronization signal to achieve synchronous transmission of a modulated signal.

[0058] In summary, in this embodiment, the synchronization signal is generated by the first carrier modulation unit PRU1, the i-th carrier modulation unit receives the synchronization signal through hard wiring, and each carrier modulation unit transmits a modulated signal based on the synchronization signal. Since the transmission time of the synchronization signal in the hard wiring is extremely short, the transmission delay is only at the ns level, which is almost negligible. Therefore, each carrier modulation unit can basically transmit the modulated signal based on the synchronization signal at the same time, which reduces the influence of the jitter phenomenon on the receiving unit to a certain extent.

[0059] Based on the above embodiments:

[0060] As a preferred embodiment, when generating a synchronization signal, sending the first modulated signal to a receiving unit corresponding to itself includes:

[0061] When generating a rising edge of a synchronization signal, sending a first modulated signal to a receiving unit corresponding to itself one by one;

[0062] When a synchronization signal is received through hard wiring, the i-th modulated signal is sent to a receiving unit corresponding to itself, comprising:

[0063] When the rising edge of the synchronization signal is received through hard wiring, the i-th modulated signal is sent to the receiving unit corresponding to itself.

[0064] In this embodiment, for the first carrier modulation unit PRU1, the first carrier modulation unit PRU1 sends the first modulated signal to the corresponding receiving unit when generating a synchronization signal. Specifically, the first carrier modulation unit PRU1 can be set to send the first modulated signal when generating the rising edge of the synchronization signal, and the corresponding i-th carrier modulation unit sends the i-th modulated signal to the corresponding receiving unit when receiving the rising edge of the synchronization signal, thereby realizing that each carrier modulation unit sends the modulated signal at the rising edge of the synchronization signal. According to the above embodiment, it can be known that the time delay between the synchronization signal generated by the first carrier modulation unit PRU1 and received by the i-th carrier modulation unit can be extremely short and can be ignored, thereby ensuring the synchronization of the modulated signals sent by each carrier modulation unit.

[0065] Of course, each carrier modulation unit may also send a modulated signal based on the falling edge of the synchronization signal, and this application does not specifically limit this.

[0066] It can be seen that each carrier modulation unit sends a modulated signal based on the rising edge of the synchronization signal, which can ensure the synchronization of the modulated signal transmission, and the logic is clear and easy to implement.

[0067] As a preferred embodiment, the i-th carrier modulation unit is connected to the first carrier modulation unit PRU1 through hard wiring, 2≤i≤N;

[0068] When a synchronization signal is received through hard wiring, the i-th modulated signal is sent to a receiving unit corresponding to itself, comprising:

[0069] When the synchronization signal sent by the first carrier modulation unit PRU1 is received through hard wiring, the i-th modulated signal is sent to the receiving unit corresponding to itself.

[0070] In this embodiment, the i-th carrier modulation unit is directly connected to the first carrier modulation unit PRU1, and the i-th carrier modulation unit can directly receive the synchronization signal generated by the first carrier modulation unit PRU1. The connection relationship of this connection method is simple, and the i-th carrier modulation unit can quickly obtain the synchronization signal generated by the first carrier modulation unit PRU1.

[0071] As a preferred embodiment, the i-th carrier modulation unit is connected to the i-1-th carrier modulation unit through hard wiring, 2≤i≤N;

[0072] The jth carrier modulation unit is further configured to forward the synchronization signal to the j+1th carrier modulation unit through hard wiring after receiving the synchronization signal transmitted by the j-1th carrier modulation unit through hard wiring, 2≤j≤N-1;

[0073] When a synchronization signal is received through hard wiring, the i-th modulated signal is sent to a receiving unit corresponding to itself, comprising:

[0074] When the synchronization signal transmitted by the (i-1)th carrier modulation unit is received through hard wiring, the i-th modulated signal is sent to the receiving unit corresponding to itself.

[0075] In this embodiment, the i-th carrier modulation unit is connected to the i-1-th carrier modulation unit through hard wiring. With this connection method, the first carrier modulation unit PRU1, the second carrier modulation unit PRU2, and the N-th carrier modulation unit PRUN are sequentially connected to form a linear structure. After the first carrier modulation unit PRU1 generates a synchronization signal, the synchronization signal is received by the j-th carrier modulation unit and then forwarded to the j+1-th carrier modulation unit. In this way, the i-th carrier modulation unit can receive the synchronization signal through the forwarding of its adjacent previous carrier modulation unit, and send the i-th modulated signal to its own corresponding receiving unit based on the synchronization signal. This connection method reduces the occupancy of the interface, and the connection method is relatively simple.

[0076] Of course, in addition to the above two connection methods, other types of connection methods can also be used to enable all i-th carrier modulation units to directly or indirectly receive the synchronization signal, and this application does not make any special limitations here.

[0077] As a preferred embodiment, the Nth carrier modulation unit PRUN is also connected to the first carrier modulation unit PRU1 through hard wiring, and is also used to forward the synchronization signal to the first carrier modulation unit PRU1;

[0078] The k-th carrier modulation unit is also used to determine whether the current synchronization signal is received within the monitoring time after the last synchronization signal is received, and if so, perform a fault protection action, 1≤k≤N;

[0079] The synchronization cycle of the synchronization signal < monitoring time < 2 times the synchronization cycle of the synchronization signal.

[0080] In this embodiment, considering that each carrier modulation unit may fail during operation, that is, the link of the synchronization signal transmission is abnormal, resulting in the sending of the modulated signal to the receiving unit corresponding to itself being out of sync, which affects the normal operation of the receiving unit, please refer to Figure 5 , Figure 5 This is a schematic diagram of the fault protection process at the time of a fault in the prior art. It can be seen from the figure that when one or several carrier modulation units fail, the faulty carrier modulation units will feed back the fault information to the control unit, and the control unit will perform fault protection actions based on the fault information. This method requires the control unit to forward the fault information, which may result in an untimely system response and cause the fault to expand.

[0081] Specifically, on the basis of sequentially connecting the first carrier modulation unit PRU1, the second carrier modulation unit PRU2 up to the Nth carrier modulation unit PRUN to form a straight line structure, the present application connects the Nth carrier modulation unit PRUN back to the first carrier modulation unit PRU1 through hard wiring, thereby forming a ring topology structure connected end to end. At this time, after receiving the synchronization signal forwarded by the N-1th carrier modulation unit, the Nth carrier modulation unit PRUN forwards the synchronization signal to the first carrier modulation unit PRU1 again to realize the ring transmission of the synchronization signal after it is generated in the first carrier modulation unit PRU1, passing through each i-th carrier modulation unit and finally returning to the first carrier modulation unit. After adopting this ring topology structure, if the first carrier modulation unit PRU1 fails, the synchronization signal will not be generated, and each carrier modulation unit cannot receive the synchronization signal; if the i-th carrier modulation unit fails, the i+1-th carrier modulation unit after the i-th carrier modulation unit to the N-th 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. At this time, the first carrier modulation unit PRU1 will actively cancel the sending of the synchronization signal, so that each carrier modulation unit cannot receive the synchronization signal.

[0082] Therefore, in the present application, the kth carrier modulation unit is also used to determine whether the current synchronization signal is received within the monitoring time after the last synchronization signal was received, 1≤k≤N. If so, a fault protection action is performed, wherein the monitoring time here is set based on the synchronization period of the synchronization signal, specifically the synchronization period of the synchronization signal < monitoring time < 2 times the synchronization period of the synchronization signal. For example, if the synchronization period of the synchronization signal is 1μs, then 1μs < monitoring time < 2μs. Setting the monitoring time range in this way enables each carrier debugging unit to quickly perform fault protection when the synchronization signal cannot be received.

[0083] It can be seen that this embodiment adopts the connection mode of the ring topology and can implement a rapid protection action at the time of a fault by setting the monitoring time of the kth carrier modulation unit.

[0084] As a preferred embodiment, the monitoring time is 1.5 times the synchronization period of the synchronization signal.

[0085] It can be seen from the above embodiments that the range of the monitoring time is set to the synchronization period of the synchronization signal < monitoring time < 2 times the synchronization period of the synchronization signal. Within this range, the monitoring time is specifically set to 1.5 times the synchronization period of the synchronization signal. If the kth carrier modulation unit does not receive the synchronization signal within the monitoring time of 1.5 times the synchronization period of the synchronization signal, it is determined that the link of the synchronization signal transmission is abnormal. At this time, a protective action should be taken in time to prevent the normal operation of the receiving unit from being affected. It can be seen that setting the monitoring time of 1.5 times the synchronization period of the synchronization signal is sensitive and less affected by signal fluctuations.

[0086] As a preferred embodiment, the fault protection action includes:

[0087] Stop sending the kth modulated signal to the receiving unit corresponding to itself.

[0088] It can be seen from the above embodiments that for the carrier modulation device provided by the present application, when each carrier modulation unit is connected end to end in sequence through hard wiring to form a ring topology structure, the kth carrier modulation unit can determine whether the current synchronization signal is received within the monitoring time after the last synchronization signal is received, thereby determining whether the transmission link of the synchronization signal is abnormal, and can quickly perform protection actions after the abnormality occurs. Specifically, considering that the transmission link abnormality causes each carrier modulation unit to transmit the modulated signal to its own corresponding receiving unit asynchronously, which may affect the normal operation of the receiving unit, therefore, the kth carrier modulation unit immediately stops sending the modulated signal to its own corresponding receiving unit at the moment when the transmission link of the synchronization signal is abnormal, thereby avoiding the influence of the asynchronous modulated signal on the receiving unit, and at the same time ensuring the normal operation of other functions of the carrier modulation device. Of course, the kth carrier modulation unit can also achieve fault protection by taking the measure of powering off at the moment of the fault, and the present application does not specifically limit how to perform the fault protection action.

[0089] As a preferred embodiment, it also includes:

[0090] Alarm unit;

[0091] The kth carrier modulation unit is further used to control the alarm unit to sound an alarm when it is determined that the current synchronization signal is not received within the monitoring time after the synchronization signal was received last time.

[0092] Taking into account the failure of the transmission link of the synchronization signal, in order to be able to promptly alert relevant personnel so that they can carry out subsequent maintenance, the present application sets an alarm unit for the carrier modulation device. The alarm unit can be connected to any carrier modulation unit. When the transmission link of the synchronization signal fails, the corresponding carrier modulation unit will control the alarm unit to issue an alarm.

[0093] In the present application, by setting up an alarm unit, an alarm prompt is provided to relevant personnel when a failure occurs in the transmission link of the synchronization signal, so that the relevant personnel can carry out subsequent maintenance work in a timely manner.

[0094] As a preferred embodiment, the alarm unit is a sound alarm unit and / or a display alarm unit.

[0095] On the basis of the above embodiments, the alarm unit can specifically adopt a sound alarm unit and / or a display alarm unit. The sound alarm unit can timely issue a sound alarm at the moment of the fault, and can set the intensity and urgency of the alarm sound according to the severity of the fault, so as to remind the relevant personnel whether the fault is urgent to deal with. Of course, voice broadcasting can also be used to directly broadcast the level of the fault; of course, a display alarm unit can also be used to display the fault. For the alarm prompt method, one of the above alarm prompt methods can be used alone, or a combination of multiple alarm prompt methods can be used, which is not particularly limited in this application.

[0096] As a preferred embodiment, the sound alarm unit is a buzzer, and the display alarm unit is an indicator light.

[0097] 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 sounder with an integrated structure, which can be directly powered by a DC voltage and has the characteristics of simple structure, low cost, and simple driving method; the indicator light is used as the display alarm unit, which can timely and accurately reflect the type and level of the fault according to the number of indicator lights, light color or brightness, and the indicator light has the advantages of low cost, easy control, and wide application range.

[0098] Of course, the sound alarm unit is not limited to a buzzer, and the display alarm unit is not limited to an indicator light. The present application does not specifically limit the types of the sound alarm unit and the display alarm unit.

[0099] As a preferred embodiment, the hard wiring is optical fiber.

[0100] In this embodiment, optical fiber is used as hard wiring, and the external interface for transmitting synchronization signals in each corresponding carrier modulation unit is an optical fiber interface. Specifically, a photoelectric converter is set inside the carrier modulation unit. After the first carrier modulation unit PRU1 generates a synchronization signal, the electrical signal is converted into an optical signal through the photoelectric converter. When the i-th carrier modulation unit receives the synchronization signal, the optical signal transmitted by the optical fiber is converted into an electrical signal again through the photoelectric converter. Optical fiber has the advantages of wide bandwidth, strong anti-interference ability, low loss, high fidelity and reliable working performance. Using optical fiber as the transmission channel of the synchronization signal can further reduce the transmission delay of the synchronization signal.

[0101] As a preferred embodiment, the k-th carrier modulation unit has multiple external interfaces for transmitting the synchronization signal and the k-th modulated signal, 1≤k≤N.

[0102] In the kth carrier modulation unit, the external interface used to transmit the synchronization signal and the kth modulated signal can be set to multiple as needed based on the system capacity and the connection method between the various carrier modulation units. At the same time, the number of external interfaces can be freely increased or decreased according to the budget and cost, thereby meeting the signal transmission needs under the premise of maximizing the use of the external interfaces.

[0103] As a preferred embodiment, the external interface includes a TX interface and a RX interface.

[0104] In this embodiment, the external interface is composed of a TX interface and an RX interface. As an interface for full-duplex transmission of signals, the external interface can realize the sending and receiving of signals at the same time, that is, realize the bidirectional transmission of signals. This full-duplex mode does not require the direction to be switched during the transmission of the signal, so there is no time delay caused by the switching operation. For the carrier modulation device disclosed in the present application, the connection mode between the N carrier modulation units is, for example, the mode in which the i-th carrier modulation unit is connected to the i-1-th carrier modulation unit through hard wiring, and the j-th carrier modulation unit is required to receive the synchronization signal transmitted by the j-1-th carrier modulation unit and forward it to the j+1-th carrier modulation unit. Therefore, when this full-duplex external interface is adopted, the synchronization signal can be received and sent simultaneously, which further reduces the transmission delay of the synchronization signal and can further improve the synchronization of the k-th carrier modulation unit transmitting the modulated signal to its one-to-one corresponding receiving unit.

[0105] As a preferred embodiment, the kth carrier modulation unit is also used to generate a carrier signal.

[0106] In this embodiment, the carrier signal is generated by the 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. In this way, no additional carrier generation device is required, and only the carrier generator of each carrier modulation unit can be used to obtain the carrier and modulate the carrier.

[0107] As a preferred embodiment, it also includes:

[0108] a control unit connected to the N carrier modulation units respectively, and configured to generate the carrier signal;

[0109] The kth carrier modulation unit is further used to perform carrier synchronization on the carrier signal.

[0110] Please refer to Figure 6 and Figure 7 , Figure 6 Schematic diagram of the cumulative error introduced by the clock difference of each carrier modulation unit. Figure 7 Schematic diagram of the uncertain phase shift of the carrier caused by the accumulated error.

[0111] Taking into account that each carrier modulation unit generates a carrier signal by itself, there are clock differences in the carrier generators inside each carrier modulation unit. These clock differences are accumulated to form clock cumulative errors, which leads to uncertain phase shifts in the carrier signals generated by each carrier modulation unit, resulting in the carriers generated by each carrier modulation unit being out of sync, causing system divergence, and the modulated signals after modulation also have the problem of being out of sync.

[0112] Specifically, the present application moves the generation of the carrier wave to the control unit connected to each carrier modulation unit, and the carrier wave generator in the control unit generates the carrier wave uniformly, and sends the carrier wave to each carrier modulation unit through hard wiring, and each carrier modulation unit performs carrier synchronization based on the carrier wave, thereby generating a local oscillation with the same frequency and phase as the carrier wave in each carrier modulation unit. Please refer to Figure 8 , Figure 8 This is a diagram of the delay of the carrier received by each carrier modulation unit through hard wiring. After the carrier is generated by the control unit, the transmission delay level of the carrier modulation unit through hard wiring is only 1-2ns. Affected by the master clock of each carrier modulation unit, the theoretical phase deviation of the carrier generated by each carrier modulation unit after being affected by its internal master clock when the carrier is synchronized is only ±20ns. Assuming that the carrier period is 10kHz, the accumulated clock error within 100us can be ignored. Please refer to Fig. 9 and Fig.10 , Fig. 9 This is a schematic diagram of the accumulated error after the main control unit generates the carrier uniformly. Fig.10 Schematic diagram of carrier phase shift after carrier modulation unit performs carrier synchronization. Fig. 9 and Fig.10 It can be seen that the phase deviation of the carrier generated by the main control unit after the carrier is uniformly generated and the carrier modulation units perform carrier synchronization is basically negligible.

[0113] It can be seen that the generation of the carrier is moved up to the main control unit, and each carrier modulation unit performs carrier synchronization based on the carrier generated by the main control unit. The carrier source is the same, and the carrier delay level connected to each carrier modulation unit after hard wiring transmission is very small. After the carrier modulation units perform carrier synchronization, the accumulated clock error can be ignored, achieving low-latency carrier synchronization.

[0114] It should be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0115] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A carrier modulation device, characterized in that: The invention 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; the first carrier modulation unit, the second carrier modulation unit and the Nth carrier modulation unit are sequentially connected to form a straight line structure, and the Nth carrier modulation unit is connected back to the first carrier modulation unit through hard wiring, thereby forming a ring topology structure in which the first and the second carrier modulation units are sequentially connected. The first carrier modulation unit is used to modulate the carrier signal to obtain a first modulated signal; Generate a synchronization signal, and send the first modulated signal to a receiving unit corresponding to itself one by one when generating the synchronization signal; The i-th carrier modulation unit is used to modulate the carrier signal to obtain the i-th modulated signal; when the synchronization signal is received through hard wiring, the i-th modulated signal is sent to the one-to-one corresponding receiving unit, 2≤i≤N; When generating a synchronization signal, sending the first modulated signal to a receiving unit corresponding to itself one by one includes: When generating a rising edge of a synchronization signal, sending the first modulated signal to a receiving unit corresponding to the first modulated signal; When the synchronization signal is received through hard wiring, the i-th modulated signal is sent to a receiving unit corresponding to itself, comprising: When a rising edge of the synchronization signal is received through hard wiring, the i-th modulated signal is sent to a receiving unit corresponding to itself one by one; The i-th carrier modulation unit is connected to the first carrier modulation unit via hard wiring, 2≤i≤N; When the synchronization signal is received through hard wiring, the i-th modulated signal is sent to a receiving unit corresponding to itself, comprising: When receiving the synchronization signal sent by the first carrier modulation unit through hard wiring, sending the i-th modulated signal to the receiving unit corresponding to itself one by one; The i-th carrier modulation unit is connected to the i-1-th carrier modulation unit by hard wiring, 2≤i≤N; The jth carrier modulation unit is further configured to forward the synchronization signal to the j+1th carrier modulation unit through hard wiring after receiving the synchronization signal transmitted by the j-1th carrier modulation unit through hard wiring, 2≤j≤N-1; When the synchronization signal is received through hard wiring, the i-th modulated signal is sent to a receiving unit corresponding to itself, comprising: When receiving the synchronization signal transmitted by the (i-1)th carrier modulation unit through hard wiring, sending the (i)th modulated signal to the receiving unit corresponding to itself one by one; The Nth carrier modulation unit is also connected to the first carrier modulation unit through hard wiring, and is also used to forward the synchronization signal to the first carrier modulation unit; The k-th carrier modulation unit is also used to determine whether the current synchronization signal is received within the monitoring time after the last synchronization signal is received, and if so, perform a fault protection action, 1≤k≤N; The synchronization period of the synchronization signal is less than the monitoring time and less than 2 times of the synchronization period of the synchronization signal; The monitoring time is 1.5 times the synchronization period of the synchronization signal; Perform fault protection actions, including: Stop sending the kth modulated signal to the receiving unit corresponding to itself; Also includes: Alarm unit; The kth carrier modulation unit is also used to control the alarm unit to issue an alarm when it is determined that the current synchronization signal is not received within the monitoring time after the last synchronization signal is received; The alarm unit is a sound alarm unit and / or a display alarm unit; The sound alarm unit is a buzzer, and the display alarm unit is an indicator light; The hard wiring is an optical fiber; The k-th carrier modulation unit has a plurality of external interfaces for transmitting the synchronization signal and the k-th modulated signal, 1≤k≤N; The external interface includes a TX interface and a RX interface; The kth carrier modulation unit is also used to generate the carrier signal, 1≤k≤N; Also includes: a control unit connected to the N carrier modulation units respectively, and configured to generate the carrier signal; The kth carrier modulation unit is further used to perform carrier synchronization on the carrier signal, 1≤k≤N.

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