Uninterruptible power supply

Abstract

The invention discloses an uninterruptible power supply, which relates to the technical field of power electronics, and comprises the following steps: a main power supply module transmits a power frequency synchronization signal to a slave power supply module through a power frequency transmission channel, transmits a carrier synchronization signal through a carrier transmission channel, and transmits a first instruction through a communication bus, indicating the power frequency synchronization signal transmitted based on the power frequency transmission channel and the carrier synchronization signal transmitted by the carrier transmission channel to operate; when the power frequency synchronization signal is abnormal, the power frequency synchronization signal is transmitted through the backup transmission channel; and when the carrier synchronization signal is abnormal, transmitting the carrier synchronization signal through the backup transmission channel, and instructing the carrier synchronization signal to operate based on the synchronization signal transmitted by the backup transmission channel through an instruction transmitted by the communication bus. Therefore, low-cost deployment is realized by using the backup transmission channel compatible with various synchronous signals, so that the uninterruptible power supply has fault-tolerant capability during synchronous signal transmission, and the reliability and practicability of the uninterruptible power supply are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power electronics, and particularly relates to an uninterruptible power supply. BACKGROUND

[0002] Due to the limited output power of a single power module, in order to drive a high-power load device, when a single power module cannot meet the actual demand of the load device, multiple power modules are often arranged in parallel to break through the power bottleneck of a single power module, form a parallel system with power stacking, redundant backup and load balancing. In the parallel system of an uninterruptible power supply (UPS), multiple power modules connected in parallel can supply power to the load device at the same time, and in order to ensure that multiple power modules operate stably and efficiently in parallel, multiple power modules need to be arranged to operate synchronously, that is, the output signals of multiple power modules are controlled to be synchronous (such as consistent voltage, frequency, phase, etc.), which can avoid the occurrence of circulating current between power modules due to phase error or power supply abnormalities of the uninterruptible power supply.

[0003] In the process of realizing output synchronization of multiple power modules, the uninterruptible power supply uses a synchronization signal to provide a unified time reference and a reference of frequency, phase, etc. for multiple power modules connected in parallel, controls the voltage, frequency, phase, etc. of the output signals of the power modules to be consistent by using the synchronization signal, thereby suppressing circulating current between devices and ensuring stable operation of the uninterruptible power supply. However, when the synchronization signal transmitted between devices of the uninterruptible power supply is abnormal, the uninterruptible power supply will have a power supply abnormality. How to make the synchronization signal transmission of the uninterruptible power supply have fault tolerance and ensure the reliability of the uninterruptible power supply becomes a problem to be solved. SUMMARY

[0004] Embodiments of the present application provide an uninterruptible power supply for realizing low-cost deployment by using a backup transmission channel compatible with multiple synchronization signals, so that the synchronization signal transmission of the uninterruptible power supply has fault tolerance, thereby improving the reliability and practicality of the uninterruptible power supply.

[0005] The uninterrupted power supply provided in the application comprises: a main power module, a plurality of slave power modules, a power frequency transmission channel, a carrier wave transmission channel, a backup transmission channel, and a communication bus; the main power module is configured to transmit a power frequency synchronization signal to the slave power modules through the power frequency transmission channel, transmit a carrier wave synchronization signal to the slave power modules through the carrier wave transmission channel, and transmit a first instruction to the slave power modules through the communication bus, the first instruction being used to instruct the slave power modules to operate based on the power frequency synchronization signal transmitted through the power frequency transmission channel and the carrier wave synchronization signal transmitted through the carrier wave transmission channel; the main power module is further configured to: when the power frequency synchronization signal transmitted through the power frequency transmission channel is abnormal, transmit the power frequency synchronization signal to the slave power modules through the backup transmission channel, and transmit a second instruction to the slave power modules through the communication bus, the second instruction being used to instruct the slave power modules to operate based on the carrier wave synchronization signal transmitted through the carrier wave transmission channel and the power frequency synchronization signal transmitted through the backup transmission channel; when the carrier wave synchronization signal transmitted through the carrier wave transmission channel is abnormal, transmit the carrier wave synchronization signal to the slave power modules through the backup transmission channel, and transmit a third instruction to the slave power modules through the communication bus, the third instruction being used to instruct the slave power modules to operate based on the power frequency synchronization signal transmitted through the power frequency transmission channel and the carrier wave synchronization signal transmitted through the backup transmission channel.

[0006] When the synchronization signals transmitted between the main power module and the plurality of slave power modules of the uninterrupted power supply are abnormal, for example, the interfaces of the power frequency transmission channel transmitting the power frequency synchronization signal or the carrier wave transmission channel transmitting the carrier wave synchronization signal are faulty (for example, damaged or in poor contact), the cables are short-circuited or open-circuited, or electromagnetic interference exists, the slave power modules cannot achieve signal synchronization with the main power module based on the abnormal synchronization signals received from the power frequency transmission channel or the carrier wave transmission channel, which will cause power supply abnormalities of the uninterrupted power supply.

[0007] Therefore, in the embodiment, a backup transmission channel is additionally arranged between the main power module and the plurality of slave power modules, the main power module can generate synchronization signals of different frequencies and phases according to software instructions, and the control logic inside the main power module is modified to dynamically adjust the type of the synchronization signals sent to the backup transmission channel, so that the main power module can transmit the synchronization signal transmitted by any one of the power frequency transmission channel or the carrier wave transmission channel to the slave power modules when the synchronization signal is abnormal. At this time, the single backup transmission channel helps to restore the signal synchronization between the main power module and the slave power modules, and is compatible with multiple types of synchronization signals, thereby significantly reducing the hardware cost and wiring complexity. Moreover, even if any one of the power frequency transmission channel or the carrier wave transmission channel is faulty, the uninterrupted power supply can quickly and accurately restore the synchronization of the signals through the backup transmission channel, avoid the circulation and power supply abnormalities caused by the loss or abnormality of the synchronization signals, and make the uninterrupted power supply have fault tolerance when transmitting the synchronization signals, thereby improving the reliability and practicability of the uninterrupted power supply.

[0008] In an embodiment, the main power supply module is further configured to: transmit a first instruction to the slave power supply module through the communication bus when the power frequency synchronization signal transmitted through the power frequency transmission channel recovers to normal; or transmit the first instruction to the slave power supply module through the communication bus when the carrier wave synchronization signal transmitted through the carrier wave transmission channel recovers to normal.

[0009] In the embodiment, when the synchronization signals transmitted through the power frequency transmission channel or the carrier wave transmission channel recover to normal, the synchronization signals transmitted through the power frequency transmission channel and the carrier wave transmission channel are recovered to be used, the backup transmission channel is avoided to be occupied for a long time, and the backup transmission channel is available to support the transmission of the synchronization signals of the uninterruptible power supply, so that the stability of the operation of the uninterruptible power supply and the flexibility of the signal transmission are improved.

[0010] In an embodiment, the main power supply module is specifically configured to: determine that the power frequency synchronization signal transmitted through the power frequency transmission channel is abnormal when it is detected that the pulse width of the power frequency synchronization signal transmitted to the slave power supply module through the power frequency transmission channel is out of a first set width range or the trigger edge of the power frequency synchronization signal is not captured within a first set time length; and determine that the carrier wave synchronization signal transmitted through the carrier wave transmission channel is abnormal when it is detected that the pulse width of the carrier wave synchronization signal transmitted to the slave power supply module through the carrier wave transmission channel is out of a second set width range or the trigger edge of the carrier wave synchronization signal is not captured within a second set time length.

[0011] In an embodiment, the slave power supply module is configured to: send a first abnormal signal to the main power supply module through the communication bus when it is detected that the pulse width of the power frequency synchronization signal received through the power frequency transmission channel is out of the first set width range or the trigger edge of the power frequency synchronization signal is not captured within the first set time length, the first abnormal signal being used to indicate that the power frequency synchronization signal transmitted through the power frequency transmission channel is abnormal; and send a second abnormal signal to the main power supply module through the communication bus when it is detected that the pulse width of the carrier wave synchronization signal received through the carrier wave transmission channel is out of the second set width range or the trigger edge of the carrier wave synchronization signal is not captured within the second set time length, the second abnormal signal being used to indicate that the carrier wave synchronization signal transmitted through the carrier wave transmission channel is abnormal.

[0012] In the embodiment, the main power supply module and the slave power supply module are both configured to detect the abnormality of the synchronization signals transmitted through the power frequency transmission channel and the carrier wave transmission channel, so that the accuracy and timeliness of the detection of the synchronization signals are improved, the uninterruptible power supply is prevented from malfunctioning due to the invalid switching or the missed processing caused by the false detection, and the reliability of the uninterruptible power supply is improved.

[0013] In an embodiment, the slave power module is further configured to: send a first normal signal to the master power module through the communication bus when it is detected that the pulse width of the power frequency synchronization signal received through the power frequency transmission channel is within a first set width range and the trigger edge of the power frequency synchronization signal is captured within a first set time length, the first normal signal being used to indicate that the power frequency synchronization signal transmitted through the power frequency transmission channel is normal; and send a second normal signal to the master power module through the communication bus when it is detected that the pulse width of the carrier wave synchronization signal received through the carrier wave transmission channel is within a second set width range and the trigger edge of the carrier wave synchronization signal is captured within a second set time length, the second normal signal being used to indicate that the carrier wave synchronization signal transmitted through the carrier wave transmission channel is normal.

[0014] In an embodiment, the master power module is further configured to: determine that the power frequency synchronization signal transmitted through the power frequency transmission channel is normal in response to receiving the first normal signal and detecting that the pulse width of the power frequency synchronization signal transmitted to the slave power module through the power frequency transmission channel is within the first set width range and the trigger edge of the power frequency synchronization signal is captured within the first set time length; and determine that the carrier wave synchronization signal transmitted through the carrier wave transmission channel is normal in response to receiving the second normal signal and detecting that the pulse width of the carrier wave synchronization signal transmitted to the slave power module through the carrier wave transmission channel is within the second set width range and the trigger edge of the carrier wave synchronization signal is captured within the second set time length.

[0015] In the embodiment, the master power module and the slave power modules are configured to detect the abnormality of the synchronization signals transmitted through the power frequency transmission channel and the carrier wave transmission channel, and to resume the operation using the synchronization signals transmitted through the power frequency transmission channel and the carrier wave transmission channel when the synchronization signals transmitted through the power frequency transmission channel and the carrier wave transmission channel are normal, thereby avoiding long-term occupation of the backup transmission channel, ensuring that the uninterruptible power supply has a usable redundant backup transmission channel to support the transmission of the synchronization signals, and improving the stability of the operation of the uninterruptible power supply and the flexibility of the signal transmission.

[0016] In an embodiment, the master power module is configured to: transmit the power frequency synchronization signal to the slave power module through the power frequency transmission channel, transmit the carrier wave synchronization signal to the slave power module through the carrier wave transmission channel, transmit the power frequency synchronization signal to the slave power module through the backup transmission channel, and transmit the first instruction to the slave power module through the communication bus; and transmit the second instruction to the slave power module through the communication bus when the power frequency synchronization signal transmitted through the power frequency transmission channel is abnormal; transmit the carrier wave synchronization signal to the slave power module through the backup transmission channel and transmit the third instruction to the slave power module through the communication bus when the carrier wave synchronization signal transmitted through the carrier wave transmission channel is abnormal.

[0017] In an embodiment, the main power module is further configured to transmit the power frequency synchronization signal to the slave power module through the backup transmission channel and transmit the first instruction to the slave power module through the communication bus when the power frequency synchronization signal transmitted by the power frequency transmission channel is normal.

[0018] In an embodiment, the main power module is specifically configured to transmit the power frequency synchronization signal to the slave power module through the power frequency transmission channel, transmit the carrier wave synchronization signal to the slave power module through the carrier wave transmission channel, transmit the carrier wave synchronization signal to the slave power module through the backup transmission channel, and transmit the first instruction to the slave power module through the communication bus; and when the power frequency synchronization signal transmitted by the power frequency transmission channel is abnormal, transmit the power frequency synchronization signal to the slave power module through the backup transmission channel, and transmit the second instruction to the slave power module through the communication bus; when the carrier wave synchronization signal transmitted by the carrier wave transmission channel is abnormal, transmit the third instruction to the slave power module through the communication bus.

[0019] In an embodiment, the main power module is further configured to transmit the carrier wave synchronization signal to the slave power module through the backup transmission channel and transmit the first instruction to the slave power module through the communication bus when the power frequency synchronization signal transmitted by the power frequency transmission channel is normal.

[0020] In the embodiment, by using the backup transmission channel compatible with multiple synchronization signals, the uninterruptible power supply can quickly and accurately recover the synchronization of signals through the backup transmission channel, avoid the circulation and power supply abnormality caused by the loss or abnormality of the synchronization signal, and make the uninterruptible power supply have fault tolerance ability during synchronization signal transmission, thereby improving the reliability and practicability of the uninterruptible power supply. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 A structure schematic diagram of an uninterruptible power supply provided by the embodiment of the application;

[0022] Figure 2 A schematic diagram of a power frequency synchronization signal provided by the embodiment of the application;

[0023] Figure 3 A schematic diagram of a carrier wave synchronization signal provided by the embodiment of the application;

[0024] Figure 4 A schematic diagram of synchronization signal transmission provided by the embodiment of the application;

[0025] Figure 5 Another schematic diagram of synchronization signal transmission provided by the embodiment of the application;

[0026] Figure 6 Another structure schematic diagram of an uninterruptible power supply provided by the embodiment of the application;

[0027] Figure 7 Another structure diagram of an uninterruptible power supply provided by an embodiment of the present application is provided.

[0028] Figure 8 Another structure diagram of an uninterruptible power supply provided by an embodiment of the present application is provided. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described in connection with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0030] The parallelly connected multiple power supply modules provided by the present application can be applied in the fields of new energy intelligent microgrid, power transmission and distribution, new energy (such as photovoltaic grid connection or wind power grid connection), light storage power generation (such as household equipment (such as refrigerator, air conditioner) or power grid power supply), or wind storage power generation, or high-power conversion module (such as converting direct current into high-voltage alternating current), and the like. The parallelly connected multiple power supply modules can be uninterruptible power supplies or other inverters, including but not limited to photovoltaic inverters, energy storage inverters, and the like. The specific application scenarios can be determined according to actual application scenarios, which are not limited herein.

[0031] The multiple power supply modules connected in parallel will be taken as an example of an uninterruptible power supply. The uninterruptible power supply usually has multiple power conversion modules, which are used to realize reliable electrical connection between the uninterruptible power supply and input power sources such as energy storage power sources, photovoltaic components, power grids, and generators, to ensure stable input of electrical energy, and are also used to establish electrical connection with loads to ensure that electrical energy can be accurately and efficiently transmitted to each electrical load. The uninterruptible power supply includes a main path and a bypass, which are connected to input power sources and loads to supply power to loads connected to the output interface of the uninterruptible power supply, and the main path is provided with a power conversion module. For example, when the input power source is a power grid, the power conversion module in the main path is in inverter mode when the uninterruptible power supply is normally operating, rectifies the alternating current input from the power grid into direct current, and then converts the direct current into alternating current to meet the power demand of the load. When the power conversion module fails, the main path is turned off, and the alternating current input from the power grid directly supplies power to the load through the bypass to ensure continuous power supply to the load. When multiple power supply modules are connected in parallel in the above uninterruptible power supply, such as in the scenario where multiple power supply modules supply power to the same load, a power frequency synchronization signal and a carrier wave synchronization signal are needed to synchronize the signals output by the multiple power supply modules connected in parallel.

[0032] This application provides an uninterruptible power supply (UPS) that achieves low-cost deployment by using a backup transmission channel compatible with multiple synchronization signals. This enables the UPS to have fault tolerance during synchronization signal transmission, thereby improving the reliability and practicality of the UPS.

[0033] The specific embodiments involved in this application are described in detail below with reference to the accompanying drawings.

[0034] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of an uninterruptible power supply 100 provided in an embodiment of this application. Figure 1 As shown, the uninterruptible power supply 100 provided in this application embodiment includes a main power module 110, multiple slave power modules 120, a power frequency transmission channel 130, a carrier transmission channel 140, a backup transmission channel 150, and a communication bus 160.

[0035] In this embodiment, the uninterruptible power supply 100 includes multiple power modules connected in parallel. One of these power modules is designated as the master power module 110, and the other power modules are designated as slave power modules 120, forming a parallel network where the master power module 110 and the multiple slave power modules 120 are connected in parallel. The master power module 110 serves as the control center, playing a leading role in the uninterruptible power supply 100. It is responsible for the overall scheduling of the uninterruptible power supply 100, controlling, allocating, and managing the multiple slave power modules 120, such as monitoring their operating status, generating and sending control commands and synchronization signals to the slave power modules 120. The slave power modules 120 receive the control commands and synchronization signals from the master power module 110, strictly execute the master power module 110's control commands, and output signals synchronized with the master power module 110.

[0036] In the uninterruptible power supply 100, since multiple power modules connected in parallel can supply power to the load equipment simultaneously, in order to ensure the synchronous operation of multiple power modules in the uninterruptible power supply 100, that is, to control the synchronization of the output voltage signals of multiple power modules (such as the consistency of voltage signal frequency, phase, etc.), the main power module 110 is used as the reference for signal synchronization. The main power module 110 sends power frequency synchronization signals and carrier synchronization signals to multiple slave power modules 120 to provide signal synchronization anchor points for all slave power modules 120. This enables multiple slave power modules 120 to control their output voltage signals to synchronize with the voltage signals output by the main power module 110 based on the received synchronization signals, thereby suppressing the generation of circulating current between power modules or the occurrence of power supply abnormalities in the uninterruptible power supply 100.

[0037] In this embodiment, a power frequency transmission channel 130 and a carrier transmission channel 140 are provided between the main power supply module 110 and the multiple slave power supply modules 120. The main power supply module 110 is used to transmit a power frequency synchronization signal to the multiple slave power supply modules 120 through the power frequency transmission channel 130, so that the multiple slave power supply modules 120 control their power frequency signals to synchronize with the power frequency signal of the main power supply module 110 based on the power frequency synchronization signal, thereby making the voltage signal output by the slave power supply modules 120 synchronize with the voltage signal output by the main power supply module 110. The main power supply module 110 is also used to transmit a carrier synchronization signal to the multiple slave power supply modules 120 through the carrier transmission channel 140, so that the multiple slave power supply modules 120 control their carrier signals to synchronize with the carrier signal of the main power supply module 110 based on the carrier synchronization signal, thereby making the switching actions of the switching transistors in the power conversion modules of the slave power supply modules 120 synchronized with the main power supply module 110.

[0038] In the parallel system of the uninterruptible power supply 100, the power frequency signal is a sinusoidal signal with the same voltage frequency as the power grid. Its frequency is fixed (e.g., 50Hz or 60Hz) and its waveform is continuous. The power frequency synchronization signal is a pulse signal used to keep the output voltage signal of each slave power module 120 in the uninterruptible power supply 100 consistent with the power frequency signal of the main power module 110. It has a specific alignment point and timing to ensure the output voltage synchronization of each power module and avoid power frequency circulating current.

[0039] In the parallel system of the uninterruptible power supply 100, the carrier signal is a high-frequency sinusoidal signal used to carry information. Its frequency is fixed, its waveform is continuous, and it does not contain information itself. It is used to modulate the pulse width modulation signal that drives the switching transistors in the power conversion module to turn on and off. The carrier synchronization signal is a pulse signal used to keep the pulse width modulation signals of each slave power module 120 in the uninterruptible power supply 100 consistent with the pulse width modulation signal of the master power module 110. It has a specific alignment point and timing to ensure that the switching actions of the switching transistors in the power conversion modules of the master power module 110 and the slave power module 120 are consistent in timing.

[0040] In addition, the uninterruptible power supply 100 is also equipped with a communication bus 160. The main power module 110 and multiple slave power modules 120 are all connected to the communication bus 160. The main power module 110 is also used to send a first instruction to each slave power module 120 through the communication bus 160 when transmitting power frequency synchronization signals to multiple slave power modules 120 through the power frequency transmission channel 130 and transmitting carrier synchronization signals to multiple slave power modules 120 through the carrier transmission channel 140. The first instruction is used to instruct the slave power module 120 to operate based on the power frequency synchronization signals transmitted through the power frequency transmission channel 130 and the carrier synchronization signals transmitted through the carrier transmission channel 140. At this time, the slave power module 120 is used to respond to the first instruction and operate based on the synchronization signals transmitted through the power frequency transmission channel 130 and the carrier transmission channel 140.

[0041] Specifically, the power frequency transmission channel 130 and the carrier transmission channel 140 are dedicated hardware channels provided in the uninterruptible power supply 100 for real-time transmission of synchronization signals between the main power module 110 and multiple slave power modules 120. The power frequency transmission channel 130 and the carrier transmission channel 140 are connected in a point-to-point direct connection manner between the main power module 110 and multiple slave power modules 120, which can ensure stability during the transmission of synchronization signals, reduce signal transmission delay, suppress the phase or timing deviation of the output signals of multiple power modules caused by delay differences, and have the transmission characteristics of low delay, low distortion, and high synchronization accuracy.

[0042] The communication bus 160 serves as a shared communication link between the main power module 110 and multiple slave power modules 120 in the uninterruptible power supply 100, enabling global information exchange, control command transmission, and collaborative fault handling. The main power module 110 can send control commands to the multiple slave power modules 120 via the communication bus 160, and the slave power modules 120 can transmit operating parameter information, fault information, etc., to the main power module 110 or other slave power modules 120 via the communication bus 160. The communication bus 160 ensures that control commands or equipment data transmission is timely and accurate, and supports the access of multiple power modules, possessing highly reliable and scalable transmission characteristics. The communication bus 160 used in the uninterruptible power supply 100 includes, but is not limited to, controller area network (CAN) buses, Ethernet buses (such as Ethernet for control automation technology (EtherCAT) buses), and dedicated industrial buses; this embodiment does not limit the specific type of bus used.

[0043] When an uninterruptible power supply includes a main power module and a slave power module, such as Figure 2 As shown, Figure 2This is a schematic diagram of a power frequency synchronization signal provided in an embodiment of this application.

[0044] In this embodiment, when the main power module generates and sends a power frequency synchronization signal to the slave power module through the power frequency transmission channel, the slave power module, upon receiving the power frequency synchronization signal, uses it to ensure that the output voltage signal of the slave power module is consistent with the output voltage signal of the main power module in frequency and phase. That is, the power frequency signal of the slave power module is synchronized with the power frequency signal of the main power module, suppressing the circulating current generated between the parallel uninterruptible power supplies due to frequency or phase deviation. Furthermore, the power frequency synchronization signal also serves as a switching trigger signal for the power conversion module in the uninterruptible power supply, ensuring that the timing of the power conversion module switching from rectification mode to inverter mode, or from inverter mode to rectification mode, in the parallel uninterruptible power supply is consistent, thus avoiding power supply fluctuations caused by timing inconsistencies.

[0045] When the power supply module receives the power frequency synchronization signal from the main power supply module through the power frequency transmission channel 130, it captures the trigger edge, such as the falling edge, to align its own power frequency signal with the zero-crossing point of the main power supply module's power frequency signal, thereby ensuring that the frequency and phase of the voltage signal output by the power supply module are consistent with those of the main power supply module.

[0046] In some implementations, such as Figure 3 As shown, Figure 3 This is a schematic diagram of a carrier synchronization signal provided in an embodiment of this application.

[0047] In this embodiment, when the main power module generates and sends a carrier synchronization signal to the slave power module through the carrier transmission channel, and the slave power module receives the power frequency synchronization signal, the slave power module, based on the carrier synchronization signal, makes its pulse width modulation signal used to drive the switching transistors in the power conversion module to turn on and off consistent with the pulse width modulation signal of the main power module. That is, the carrier signal of the slave power module is synchronized with the carrier signal of the main power module, so that the timing of the switching actions of the switching transistors in the power conversion modules of the parallel main power module and the slave power module is consistent, suppressing the ripple circulating current and output ripple superposition caused by the chaotic switching timing.

[0048] When the power supply module receives the carrier synchronization signal from the main power supply module through the carrier transmission channel, it captures the trigger edge, such as the falling edge, and aligns its own carrier signal with the zero-crossing point of the main power supply module's carrier signal, so that the switching actions of the switching transistors in the power conversion modules of the parallel main power supply module and the power supply module are synchronized.

[0049] However, when the synchronization signal transmitted between the main power module and multiple slave power modules of the uninterruptible power supply (UPS) is abnormal—such as interface failure (damage or poor contact) of the power frequency transmission channel for transmitting the power frequency synchronization signal or the carrier transmission channel for transmitting the carrier synchronization signal, cable short circuit or open circuit, or the presence of electromagnetic interference—the slave power modules will be unable to synchronize with the main power module's power frequency signal based on the abnormal power frequency synchronization signal received from the power frequency transmission channel, or with the main power module's carrier signal based on the abnormal carrier synchronization signal received from the carrier transmission channel. This will lead to a power supply abnormality in the UPS. Therefore, if... Figure 1 As shown, the uninterruptible power supply 100 provided in this application embodiment also includes a backup transmission channel 150 that is consistent with the power frequency transmission channel 130 and the carrier transmission channel 140. The backup transmission channel 150 can transmit power frequency synchronization signals or carrier synchronization signals.

[0050] In some implementations, the main power module 110 includes a software-programmable synchronization signal generator. Figure 1 (Not shown in the image), such as a microcontroller unit (MCU), which can generate power frequency synchronization signals or carrier synchronization signals of different frequencies and phases according to software instructions. By modifying its internal control logic, the type of synchronization signal sent to the backup transmission channel 150 can be dynamically adjusted, thereby switching the synchronization signal transmitted by the backup transmission channel 150, such as switching the carrier synchronization signal to the power frequency synchronization signal, or switching the power frequency synchronization signal to the carrier synchronization signal.

[0051] In some implementations, the main power module 110 is used to transmit a power frequency synchronization signal to the slave power module 120 via the backup transmission channel 150 when the power frequency synchronization signal transmitted via the power frequency transmission channel 130 is abnormal, while maintaining the transmission of a carrier synchronization signal to the slave power module 120 via the carrier transmission channel 140. Simultaneously, a second instruction is transmitted to the slave power module 120 via the communication bus 160, instructing the slave power module 120 to operate based on the carrier synchronization signal transmitted via the carrier transmission channel 140 and the power frequency synchronization signal transmitted via the backup transmission channel 150.

[0052] The main power module 110 is also used to transmit a carrier synchronization signal to the slave power module 120 via the backup transmission channel 150 when the carrier synchronization signal transmitted via the carrier transmission channel 140 is abnormal, while maintaining the transmission of the power frequency synchronization signal to the slave power module 120 via the power frequency transmission channel 130. Simultaneously, it transmits a third instruction to the slave power module 120 via the communication bus 160, the third instruction instructing the slave power module 120 to operate based on the power frequency synchronization signal transmitted via the power frequency transmission channel 130 and the carrier synchronization signal transmitted via the backup transmission channel 150.

[0053] Based on this, when the power frequency synchronization signal transmitted by the power frequency transmission channel 130 or the carrier synchronization signal transmitted by the carrier transmission channel 140 fails, the synchronization signal transmitted by the backup transmission channel 150 can be quickly switched to the synchronization signal transmitted by the failed transmission channel. This improves the fault tolerance capability of the synchronization signal transmission in the uninterruptible power supply 100 and ensures the reliability of the synchronization signal transmission between the main power module 110 and the slave power module 120. Furthermore, it eliminates the need to separately configure a backup transmission channel 150 for both the power frequency transmission channel 130 and the carrier transmission channel 140. A single backup transmission channel 150 can cover the fault replacement requirements of both the power frequency transmission channel 130 and the carrier transmission channel 140, reducing the use of redundant backup transmission channels 150 and thus significantly reducing the hardware cost of the uninterruptible power supply 100. Furthermore, by using the backup transmission channel 150 to transmit the synchronization signal from the abnormal power frequency transmission channel 130 or carrier transmission channel 140, the synchronization of power frequency signals and carrier signals between the main power supply module 110 and multiple slave power supply modules 120 can be guaranteed. This avoids the uninterruptible power supply 100 from shutting down due to asynchrony of power frequency signals or carrier signals, or the uninterruptible power supply 100 switching from the main circuit to the bypass circuit, thus improving the reliability and practicality of the uninterruptible power supply 100.

[0054] In some implementations, when the main power module 110 transmits an abnormal power frequency synchronization signal via the power frequency transmission channel 130, and transmits a power frequency synchronization signal to the slave power module 120 via the backup transmission channel 150 and sends a second command to the slave power module 120 via the communication bus 160, if the abnormal power frequency transmission channel 130 still transmits the power frequency synchronization signal, the second command is further used to instruct the slave power module 120 not to receive the power frequency synchronization signal transmitted via the abnormal power frequency transmission channel 130. Alternatively, if the slave power module 120 simultaneously receives synchronization signals transmitted via the abnormal power frequency transmission channel 130, the normal carrier transmission channel 140, and the backup transmission channel 150, the second command is further used to instruct the slave power module 120 not to operate based on the received power frequency synchronization signal transmitted via the abnormal power frequency transmission channel 130, but rather based on the received power frequency synchronization signal transmitted via the backup transmission channel 150.

[0055] In some implementations, when the carrier synchronization signal transmitted by the main power module 110 via the carrier transmission channel 140 is abnormal, and the main power module 110 transmits the carrier synchronization signal to the slave power module 120 via the backup transmission channel 150 and sends a third instruction to the slave power module 120 via the communication bus 160, if the abnormal carrier transmission channel 140 is still transmitting the carrier synchronization signal, the third instruction is further used to instruct the slave power module 120 not to receive the power frequency synchronization signal transmitted by the abnormal carrier transmission channel 140. Alternatively, if the slave power module 120 simultaneously receives synchronization signals transmitted by the abnormal carrier transmission channel 140, the normal power frequency transmission channel 130, and the backup transmission channel 150, the third instruction is further used to instruct the slave power module 120 not to operate based on the received carrier synchronization signal transmitted by the abnormal carrier transmission channel 140, but based on the received carrier synchronization signal transmitted by the backup transmission channel 150.

[0056] In this embodiment, the main power module 110 is further configured to send a first command to the slave power module 120 via the communication bus 160 when the power frequency synchronization signal transmitted through the power frequency transmission channel 130 returns to normal; alternatively, the main power module 110 is further configured to send a first command to the slave power module 120 via the communication bus 160 when the carrier synchronization signal transmitted through the carrier transmission channel 140 returns to normal. The slave power module 120 is configured to operate in response to the first command, based on the power frequency synchronization signal transmitted through the power frequency transmission channel 130 and the carrier synchronization signal transmitted through the carrier transmission channel 140. Thus, when the power frequency synchronization signal transmitted through the power frequency transmission channel 130 returns to normal, the operation of the power frequency synchronization signal transmitted through the power frequency transmission channel 130 is resumed. Alternatively, when the carrier synchronization signal transmitted through the carrier transmission channel 140 returns to normal, the operation of the carrier synchronization signal transmitted through the carrier transmission channel 140 is resumed. This avoids the long-term occupation of the backup transmission channel 150 and ensures that the synchronization signal transmission of the uninterruptible power supply 100 has a usable redundant backup transmission channel 150 to support it, thereby improving the stability of the uninterruptible power supply 100's operation and the flexibility of signal transmission.

[0057] In some implementations, when the main power module 110 outputs a power frequency synchronization signal to the power frequency transmission channel 130 or a carrier synchronization signal to the carrier transmission channel 140, there may be issues such as abnormal power frequency synchronization signals or abnormal carrier synchronization signals, or interface failures of the power frequency transmission channel 130 or the carrier transmission channel 140. When receiving the power frequency synchronization signal transmitted from the power frequency transmission channel 130 or the carrier synchronization signal transmitted from the carrier transmission channel 140 from the power module 120, there may be issues such as cable short circuits or open circuits, electromagnetic interference, or output interface failures, causing abnormal synchronization signals transmitted through the transmission channels. Therefore, the main power module 110 and multiple slave power modules 120 are used to detect whether the synchronization signals transmitted by the power frequency transmission channel 130 and the carrier transmission channel 140 are abnormal.

[0058] When the main power module 110 and multiple slave power modules 120 detect the synchronization signals transmitted through the power frequency transmission channel 130 and the carrier transmission channel 140, they can use the controller area network access protocol (CAP) to capture, record, and analyze the synchronization signals transmitted through the power frequency transmission channel 130 and the carrier transmission channel 140 in real time to determine whether the captured synchronization signals transmitted in the power frequency transmission channel 130 and the carrier transmission channel 140 meet expectations. On the one hand, the trigger edge (rising edge or falling edge) of the synchronization signal is captured. If the trigger edge of the synchronization signal is not captured within a timeout period, and if the synchronization signal remains at the rising edge or falling edge without switching, the synchronization signal transmitted through the transmission channel is determined to be abnormal. On the other hand, the pulse width of the synchronization signal is detected. If the pulse width of the synchronization signal is outside the set width range, the synchronization signal transmitted through the transmission channel is also determined to be abnormal.

[0059] Specifically, the main power module 110 is configured to determine that the power frequency synchronization signal transmitted through the power frequency transmission channel 130 is abnormal when it detects that the pulse width of the power frequency synchronization signal transmitted to the slave power module 120 via the power frequency transmission channel 130 is outside a first set width range, or when it fails to capture the trigger edge of the power frequency synchronization signal within a first set duration. The slave power module 120 is configured to send a first abnormality signal to the main power module 110 via the communication bus 160 when it detects that the pulse width of the power frequency synchronization signal received via the power frequency transmission channel 130 is outside the first set width range, or when it fails to capture the trigger edge of the power frequency synchronization signal within a first set duration. The first abnormality signal indicates that the power frequency synchronization signal transmitted via the power frequency transmission channel 130 is abnormal. Upon receiving the first abnormality signal from any slave power module 120, the main power module 110 determines that the power frequency synchronization signal transmitted via the power frequency transmission channel 130 is abnormal, transmits the power frequency synchronization signal to the slave power module 120 via the backup transmission channel 150, and transmits a second instruction to the slave power module 120 via the communication bus 160.

[0060] In addition, the main power module 110 is also configured to determine that the carrier synchronization signal transmitted by the carrier transmission channel 140 is abnormal when it detects that the pulse width of the carrier synchronization signal transmitted through the carrier transmission channel 140 to the slave power module 120 is outside the second set width range, or when the trigger edge of the carrier synchronization signal is not captured within the second set duration. The slave power module 120 is also configured to send a second abnormal signal to the main power module 110 via the communication bus 160 when it detects that the pulse width of the carrier synchronization signal received through the carrier transmission channel 140 is outside the second set width range, or when the trigger edge of the carrier synchronization signal is not captured within the second set duration. The second abnormal signal is used to indicate that the carrier synchronization signal transmitted by the carrier transmission channel 140 is abnormal. When the main power module 110 receives any second abnormal signal sent by the slave power module 120, it determines that the carrier synchronization signal transmitted by the carrier transmission channel 140 is abnormal, transmits the carrier synchronization signal to the slave power module 120 via the backup transmission channel 150, and transmits a third instruction to the slave power module 120 via the communication bus 160.

[0061] In some embodiments, the slave power module 120, upon detecting that the pulse width of the power frequency synchronization signal received through the power frequency transmission channel 130 is within a first set width range and capturing the trigger edge of the power frequency synchronization signal within a first set duration, sends a first normal signal to the master power module 110 via the communication bus 160. The first normal signal indicates that the power frequency synchronization signal transmitted through the power frequency transmission channel 130 has returned to normal. Upon receiving the first normal signal from each slave power module 120 and detecting that the pulse width of the power frequency synchronization signal transmitted through the power frequency transmission channel 130 to the slave power module 120 is within the first set width range and capturing the trigger edge of the power frequency synchronization signal within the first set duration, the master power module 110 determines that the power frequency synchronization signal transmitted through the power frequency transmission channel 130 has returned to normal and transmits a first command to the multiple slave power modules 120 via the communication bus 160.

[0062] Additionally, when the power supply module 120 detects that the pulse width of the carrier synchronization signal received through the carrier transmission channel 140 is within a second set width range and captures the trigger edge of the carrier synchronization signal within a second set duration, it sends a second normal signal to the main power supply module 110 via the communication bus 160. The second normal signal indicates that the carrier synchronization signal transmitted through the carrier transmission channel 140 has returned to normal. The main power supply module 110, upon receiving the second normal signal from each power supply module 120 and detecting that the pulse width of the carrier synchronization signal transmitted through the carrier transmission channel 140 to the power supply module 120 is within a second set width range and captures the trigger edge of the carrier synchronization signal within a second set duration, determines that the carrier synchronization signal transmitted through the carrier transmission channel 140 has returned to normal and transmits a first instruction to the multiple power supply modules 120 via the communication bus 160.

[0063] In this embodiment, the main power supply module 110 and multiple slave power supply modules 120 are used to detect anomalies in the synchronization signals transmitted through the power frequency transmission channel 130 and the carrier transmission channel 140, thereby avoiding misjudgment or missed judgment when detecting a single node, improving the accuracy and timeliness of synchronization signal detection, reducing uninterruptible power supply 100 failures caused by invalid switching or missed processing due to false detection, and improving the reliability of uninterruptible power supply 100.

[0064] In some implementations, such as Figure 4 As shown, Figure 4 This is a schematic diagram of a synchronization signal transmission provided in an embodiment of this application.

[0065] In this embodiment, the main power module is used to transmit power frequency synchronization signals to multiple slave power modules through the power frequency transmission channel and to transmit carrier synchronization signals to multiple slave power modules through the carrier transmission channel. In addition, the backup transmission channel is set to transmit power frequency synchronization signals, that is, the main power module is also used to transmit power frequency synchronization signals to multiple slave power modules through the backup transmission channel.

[0066] In some implementations, the backup transmission channel may also be configured to transmit a carrier synchronization signal. Alternatively, the backup transmission channel may not transmit a synchronization signal when there is no abnormality in the synchronization signal transmitted by the power frequency transmission channel or the carrier transmission channel. This application does not limit this aspect.

[0067] like Figure 4As shown, during the first time period T1, the main power module transmits power frequency synchronization signals to multiple slave power modules through the power frequency transmission channel and carrier synchronization signals to multiple slave power modules through the carrier transmission channel, both of which are normal. At this time, the main power module outputs a first instruction to multiple slave power modules through the communication bus. The first instruction is used to instruct the multiple slave power modules to operate based on the power frequency synchronization signals transmitted through the power frequency transmission channel and the carrier synchronization signals transmitted through the carrier transmission channel. Furthermore, the first instruction is also used to instruct the multiple slave power modules not to receive the power frequency synchronization signals transmitted through the backup transmission channel, or to instruct the multiple slave power modules to receive the power frequency synchronization signals transmitted through the backup transmission channel, but not to operate based on the power frequency synchronization signals received from the backup transmission channel.

[0068] like Figure 4 As shown, during the second time period T2, when the main power module determines that the transmission of carrier synchronization signals to multiple slave power modules via the carrier transmission channel is abnormal, the main power module transmits power frequency synchronization signals to the multiple slave power modules via the power frequency transmission channel and carrier synchronization signals to the multiple slave power modules via the backup transmission channel. That is, the synchronization signal transmitted by the backup transmission channel is switched from the power frequency synchronization signal to the carrier synchronization signal. At this time, the main power module outputs a third instruction to the multiple slave power modules via the communication bus. The third instruction is used to instruct the multiple slave power modules to operate based on the power frequency synchronization signal transmitted by the power frequency transmission channel and the carrier synchronization signal transmitted by the backup transmission channel. Furthermore, the third instruction is also used to instruct the multiple slave power modules not to receive the carrier synchronization signal transmitted by the carrier transmission channel, or to instruct the multiple slave power modules to receive the carrier synchronization signal transmitted by the carrier transmission channel, but not to operate based on the carrier synchronization signal received by the carrier transmission channel.

[0069] During the third time period T3, when the main power module determines that the transmission of carrier synchronization signals to multiple slave power modules via the carrier transmission channel has returned to normal, the synchronization signal transmitted by the main power module through the backup transmission channel is switched back from the carrier synchronization signal to the default power frequency synchronization signal. At this time, the main power module outputs a first instruction to the multiple slave power modules through the communication bus. The first instruction is used to instruct the multiple slave power modules to operate based on the power frequency synchronization signal transmitted through the power frequency transmission channel and the carrier synchronization signal transmitted through the carrier transmission channel. Furthermore, the first instruction is also used to instruct the multiple slave power modules not to receive the power frequency synchronization signal transmitted through the backup transmission channel, or to instruct the multiple slave power modules to receive the power frequency synchronization signal transmitted through the backup transmission channel, but not to operate based on the power frequency synchronization signal received from the backup transmission channel.

[0070] like Figure 5 As shown, Figure 5 This is a schematic diagram of another synchronization signal transmission provided in an embodiment of this application.

[0071] like Figure 5As shown, during the first time period T4, the main power module transmits power frequency synchronization signals to multiple slave power modules through the power frequency transmission channel and carrier synchronization signals to multiple slave power modules through the carrier transmission channel, both of which are normal. At this time, the main power module outputs a first instruction to multiple slave power modules through the communication bus. The first instruction is used to instruct the multiple slave power modules to operate based on the power frequency synchronization signals transmitted through the power frequency transmission channel and the carrier synchronization signals transmitted through the carrier transmission channel. Furthermore, the first instruction is also used to instruct the multiple slave power modules not to receive the power frequency synchronization signals transmitted through the backup transmission channel, or to instruct the multiple slave power modules to receive the power frequency synchronization signals transmitted through the backup transmission channel, but not to operate based on the power frequency synchronization signals received from the backup transmission channel.

[0072] During the second time period T5, if the main power module determines that the transmission of the power frequency synchronization signal to multiple slave power modules via the power frequency transmission channel is abnormal, the main power module will transmit a carrier synchronization signal to the multiple slave power modules via the carrier transmission channel and a power frequency synchronization signal via the backup transmission channel. That is, the synchronization signal transmitted via the backup transmission channel will remain the power frequency synchronization signal without switching. At this time, the main power module will output a second command to the multiple slave power modules via the communication bus. The second command instructs the multiple slave power modules to operate based on the carrier synchronization signal transmitted via the carrier transmission channel and the power frequency synchronization signal transmitted via the backup transmission channel. Furthermore, the second command also instructs the multiple slave power modules not to receive the power frequency synchronization signal transmitted via the power frequency transmission channel, or instructs the multiple slave power modules to receive the power frequency synchronization signal transmitted via the power frequency transmission channel but not to operate based on the power frequency synchronization signal received via the power frequency transmission channel.

[0073] During the third time period T6, when the main power module determines that the transmission of the power frequency synchronization signal to the multiple slave power modules via the power frequency transmission channel has returned to normal, the main power module outputs a first command to the multiple slave power modules via the bus. This first command instructs the multiple slave power modules to operate based on the power frequency synchronization signal transmitted via the power frequency transmission channel and the carrier synchronization signal transmitted via the carrier transmission channel. Furthermore, the first command also instructs the multiple slave power modules not to receive the power frequency synchronization signal transmitted via the backup transmission channel, or instructs the multiple slave power modules to receive the power frequency synchronization signal transmitted via the backup transmission channel, but not to operate based on the power frequency synchronization signal received from the backup transmission channel.

[0074] Please see Figure 6 , Figure 6 This is a schematic diagram of another uninterruptible power supply 100 provided in an embodiment of this application. (See attached diagram.) Figure 6 As shown, the uninterruptible power supply 100 provided in this application embodiment includes a main power module 110, multiple slave power modules 120, a power frequency transmission channel 130, a carrier transmission channel 140, a backup transmission channel 150, and a communication bus 160.

[0075] In this embodiment, the main power module 110 and multiple slave power modules 120 in the uninterruptible power supply 100 each include a first controller 170 and multiple power modules ( Figure 6 (Not shown in the diagram), and the main power module 110 and multiple slave power modules 120 are located in independent racks. At this time, the first controller 170 may include an energy control module (ECM), which is a core unit integrating hardware circuits and control software, responsible for acquiring signals, performing logical operations, and outputting control commands to ensure that the uninterruptible power supply 100 executes the control rules in the above embodiments.

[0076] In some implementations, such as Figure 7 As shown, the main power module 110 and multiple slave power modules 120 in the uninterruptible power supply 100 are located in the same rack, and the uninterruptible power supply 100 also includes multiple power modules ( Figure 7 (Not shown in the image), the first controller 170 in the main power module 110 may include an energy monitoring module as the control core of the uninterruptible power supply 100. The first controller 170 in the main power module 110 is used to output control commands to the first controllers 170 in the multiple slave power modules 120. The first controllers 170 in the multiple slave power modules 120 used to execute the control rules corresponding to the above control commands may be general-purpose central processing units (CPUs), general-purpose processors, digital signal processing (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, hardware components, or any combination thereof, without limitation.

[0077] In this embodiment, the first controller 170 in the main power module 110 is used to generate and transmit a power frequency synchronization signal to the first controller 170 in each slave power module 120 via the power frequency transmission channel 130. This enables the multiple slave power modules 120 to synchronize their power frequency signals with the power frequency signal of the main power module 110 based on the power frequency synchronization signal, i.e., the voltage signal output by the slave power module 120 is synchronized with the voltage signal output by the main power module 110. The first controller 170 in the main power module 110 is also used to generate and transmit a carrier synchronization signal to the first controller 170 in each slave power module 120 via the carrier transmission channel 140. This enables the multiple slave power modules 120 to synchronize the switching actions of the switching transistors in the power conversion modules of the slave power modules 120 with those of the main power module 110 based on the carrier synchronization signal.

[0078] In other implementations, such as Figure 8 As shown, Figure 8 This is a schematic diagram of another uninterruptible power supply 100 provided in an embodiment of this application. The main power module 110 and multiple slave power modules 120 provided in this embodiment can each include a first controller 170 and a second controller 180.

[0079] In this embodiment, the second controller 180 serves as a backup controller. It is the core control unit responsible for backup mode management and emergency switching in the main power module 110 and the slave power module 120. Thus, it can ensure the high reliability and uninterrupted power supply capability of the main power module 110 and multiple slave power modules 120 through dual control modes, and avoid the failure of the main power module 110 or slave power module 120 due to the failure of a single controller, which could lead to load power failure, data loss, equipment damage, etc.

[0080] The main power module 110 and the first controller 170 and second controller 180 in each slave power module 120 are all connected to the communication bus 160. The first controller 170 and second controller 180 of the main power module 110 can generate and transmit corresponding synchronization signals to the first controller 170 and second controller 180 in each slave power module 120 through the power frequency transmission channel 130 and the carrier transmission channel 140. If the first controller 170 of the main power module 110 or any slave power module 120 fails, the control rules in the above embodiment are executed by the second controller 180 therein.

[0081] Furthermore, in the above embodiments, by additionally setting a backup transmission channel 150 between the main power module 110 and multiple slave power modules 120, the main power module 110 can generate synchronization signals of different frequencies and phases according to software instructions. By modifying its internal control logic, the type of synchronization signal sent to the backup transmission channel 150 can be dynamically adjusted. This allows the main power module 110 to use the backup transmission channel 150 to transmit the corresponding normal synchronization signal to the slave power modules 120 when the power frequency synchronization signal transmitted through the power frequency transmission channel 130 or the carrier synchronization signal transmitted through the carrier transmission channel 140 is abnormal. This achieves compatibility with multiple types of synchronization signals, thereby significantly reducing the hardware cost and wiring complexity of the uninterruptible power supply 100. Moreover, it helps restore signal synchronization between the main power module 110 and the slave power modules 120, avoiding circulating current and power supply abnormalities caused by the loss or abnormality of synchronization signals. This gives the uninterruptible power supply 100 fault-tolerant capability during synchronization signal transmission, improving the reliability and practicality of the uninterruptible power supply 100.

[0082] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An uninterruptible power supply, characterized by The uninterrupted power supply comprises a main power module, a plurality of slave power modules, a power frequency transmission channel, a carrier wave transmission channel, a backup transmission channel and a communication bus; The main power module is configured to transmit a power frequency synchronization signal to the slave power modules through the power frequency transmission channel, transmit a carrier wave synchronization signal to the slave power modules through the carrier wave transmission channel, and transmit a first instruction to the slave power modules through the communication bus, the first instruction being used to instruct the slave power modules to operate based on the power frequency synchronization signal transmitted by the power frequency transmission channel and the carrier wave synchronization signal transmitted by the carrier wave transmission channel; The main power module is further configured to: when the power frequency synchronization signal transmitted by the power frequency transmission channel is abnormal, transmit the power frequency synchronization signal to the slave power modules through the backup transmission channel and transmit a second instruction to the slave power modules through the communication bus, the second instruction being used to instruct the slave power modules to operate based on the carrier wave synchronization signal transmitted by the carrier wave transmission channel and the power frequency synchronization signal transmitted by the backup transmission channel; when the carrier wave synchronization signal transmitted by the carrier wave transmission channel is abnormal, transmit the carrier wave synchronization signal to the slave power modules through the backup transmission channel and transmit a third instruction to the slave power modules through the communication bus, the third instruction being used to instruct the slave power modules to operate based on the power frequency synchronization signal transmitted by the power frequency transmission channel and the carrier wave synchronization signal transmitted by the backup transmission channel.

2. The uninterruptible power supply of claim 1, wherein, The main power module is further configured to: when the power frequency synchronization signal transmitted by the power frequency transmission channel is normal, transmit the first instruction to the slave power modules through the communication bus; or when the carrier wave synchronization signal transmitted by the carrier wave transmission channel is normal, transmit the first instruction to the slave power modules through the communication bus.

3. The uninterruptible power supply of claim 1 or 2, wherein, The main power module is specifically configured to: when it is detected that the pulse width of the power frequency synchronization signal transmitted to the slave power modules through the power frequency transmission channel is outside a first set width range or a trigger edge of the power frequency synchronization signal is not captured within a first set time length, it is determined that the power frequency synchronization signal transmitted by the power frequency transmission channel is abnormal; when it is detected that the pulse width of the carrier wave synchronization signal transmitted to the slave power modules through the carrier wave transmission channel is outside a second set width range or a trigger edge of the carrier wave synchronization signal is not captured within a second set time length, it is determined that the carrier wave synchronization signal transmitted by the carrier wave transmission channel is abnormal.

4. The uninterruptible power supply of claim 1 or 2, wherein, The slave power module is configured to: when it is detected that the pulse width of the power frequency synchronization signal received through the power frequency transmission channel is outside a first set width range or a trigger edge of the power frequency synchronization signal is not captured within a first set time length, a first abnormal signal is sent to the main power module through the communication bus, the first abnormal signal being used to indicate that the power frequency synchronization signal transmitted by the power frequency transmission channel is abnormal; when it is detected that the pulse width of the carrier wave synchronization signal received through the carrier wave transmission channel is outside a second set width range or a trigger edge of the carrier wave synchronization signal is not captured within a second set time length, a second abnormal signal is sent to the main power module through the communication bus, the second abnormal signal being used to indicate that the carrier wave synchronization signal transmitted by the carrier wave transmission channel is abnormal. When it is detected that the pulse width of the carrier synchronization signal received through the carrier transmission channel is out of the second set width range, or the trigger edge of the carrier synchronization signal is not captured within the second set time length, a second abnormal signal is sent to the master power module through the communication bus, and the second abnormal signal is used to indicate that the carrier synchronization signal transmitted by the carrier transmission channel is abnormal.

5. The uninterruptible power supply of claim 4, wherein, The slave power module is further used for: When it is detected that the pulse width of the power frequency synchronization signal received through the power frequency transmission channel is within the first set width range, and the trigger edge of the power frequency synchronization signal is captured within the first set time length, a first normal signal is sent to the master power module through the communication bus, and the first normal signal is used to indicate that the power frequency synchronization signal transmitted by the power frequency transmission channel is normal. When it is detected that the pulse width of the carrier synchronization signal received through the carrier transmission channel is within the second set width range, and the trigger edge of the carrier synchronization signal is captured within the second set time length, a second normal signal is sent to the master power module through the communication bus, and the second normal signal is used to indicate that the carrier synchronization signal transmitted by the carrier transmission channel is normal.

6. The uninterruptible power supply of claim 5, wherein, The master power module is further specifically used for: In response to receiving the first normal signal, and detecting that the pulse width of the power frequency synchronization signal transmitted to the slave power module through the power frequency transmission channel is within the first set width range, and the trigger edge of the power frequency synchronization signal is captured within the first set time length, it is determined that the power frequency synchronization signal transmitted by the power frequency transmission channel is normal. In response to receiving the second normal signal, and detecting that the pulse width of the carrier synchronization signal transmitted to the slave power module through the carrier transmission channel is within the second set width range, and the trigger edge of the carrier synchronization signal is captured within the second set time length, it is determined that the carrier synchronization signal transmitted by the carrier transmission channel is normal.

7. The uninterruptible power supply of any of claims 1 to 6, wherein, The master power module is specifically used for: transmitting the power frequency synchronization signal to the slave power module through the power frequency transmission channel, transmitting the carrier synchronization signal to the slave power module through the carrier transmission channel, transmitting the power frequency synchronization signal to the slave power module through the backup transmission channel, and transmitting the first instruction to the slave power module through the communication bus; and, when the power frequency synchronization signal transmitted by the power frequency transmission channel is abnormal, transmitting the second instruction to the slave power module through the communication bus; when the carrier synchronization signal transmitted by the carrier transmission channel is abnormal, transmitting the carrier synchronization signal to the slave power module through the backup transmission channel, and transmitting the third instruction to the slave power module through the communication bus.

8. The uninterruptible power supply of claim 7, wherein, The master power module is further used for: When the carrier synchronization signal transmitted by the carrier transmission channel is normal, the mains frequency synchronization signal is transmitted to the slave power module through the backup transmission channel, and the first instruction is transmitted to the slave power module through the communication bus.

9. The uninterruptible power supply of any of claims 1 to 6, wherein, The main power module is specifically used for: When the mains frequency synchronization signal transmitted by the mains frequency transmission channel is abnormal, the mains frequency synchronization signal is transmitted to the slave power module through the backup transmission channel, and the second instruction is transmitted to the slave power module through the communication bus. When the carrier synchronization signal transmitted by the carrier transmission channel is abnormal, the third instruction is transmitted to the slave power module through the communication bus. The main power module is further used for: When the mains frequency synchronization signal transmitted by the mains frequency transmission channel is normal, the carrier synchronization signal is transmitted to the slave power module through the backup transmission channel, and the first instruction is transmitted to the slave power module through the communication bus.

10. The uninterruptible power supply of claim 9, wherein, ​ ​

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