116results about How to "Achieve fault isolation" patented technology

The invention provides an engine rotating speed measurement circuit and a method. Two independent rotating speed sensors simultaneously collect engine rotating speeds. Each rotating speed sensor output signal is regulated through two kinds of non-similar redundancy conditioning circuits of high and low thresholds and then square wave signals are output and are collected by a frequency measurement apparatus. Through voting, a final engine rotating speed is acquired. The circuit and the method possess characteristics that precision is high; an anti-interference capability is high and reliability is high and can be used for an aviation engine rotating speed detection system with a wide flight envelope and a complex usage environment.

The invention relates to an underwater sound array system without cable connection in deepwater and a synchronous acquisition method. The synchronous acquisition method is used for long-term synchronous data acquisition for array elements of underwater sound array in the deepwater. The method comprises a synchronization method and a data acquisition recording method. The synchronization method comprises the steps of: 101) timing the array elements; and 102) keeping the time continuously by high-precision clock sources contained inside the array elements, thereby realizing long-term accurate synchronization among the array elements. The step 101) can adopt PPS signals provided by a GPS system or a Beidou system to accomplish timing. The clock source can adopt a miniature CPT atomic clock. According to the invention, a strategy for carrying out synchronization by adopting synchronization signal wires in a cable in the prior art is omitted among the array elements, and a mode of cooperating timing with time keeping is adopted to realize synchronization of the array elements. In addition, introduction of the synchronization mode enables the array elements to be arranged flexibly and can integrate functions of data acquisition and recording.

The invention discloses an electronic replacement part technology state automatic detection system based on a PXI bus. The replacement part technology state automatic detection system based on the PXI bus comprises a controller with automatic detection system software, a PXI system, a VPC connector, an adaptor, a keyboard connected with the controller and a displayer, wherein the PXI system is formed by a PXI case and more than two PXI modules inserted into corresponding inserting grooves of the PXI case; the adaptor comprises a system self-test adaptor; the controller is connected with the PXI case through the PXI bus; signal ends of all PXI modules are connected with the self-test adaptor or a special test adaptor through the VPC connector; the system self-test adaptor comprises a standard current source, a standard resistor R, a reference source circuit, a square-wave generator, a signal route N1, a signal route N2, a signal route N3, a first copper foil short-circuit wire, a second copper foil short-circuit wire, a third copper foil short-circuit wire, a fourth copper foil short-circuit wire and a fifth copper foil short-circuit wire. The replacement part technology state automatic detection system based on the PXI bus has the advantages that due to the adoption of the adaptor, separating performance of an electronic replacement part to be tested and a PXI port is good, the system has good universality and expansibility, polytypic signals can be tested, and detection automation degree is high.

The invention discloses an unknown input observer based satellite actuating mechanism fault diagnosis method which can realize fault isolation of momentum wheels in different channels without directly measuring relevant physic quantities of an actuating mechanism. The method comprises the basic procedures of: firstly, establishing an analytical model used for describing an input and output relationship between the actuating mechanism and an inertia sensor and selecting an actuating mechanism fault isolation strategy; then regarding a fault of a non-target actuating mechanism as an unknown input based on requirements of a structural residual error design, designing an unknown input observer to obtain a residual error for fault decoupling of the non-target actuating mechanism, selecting a bound norm of the residual error as a residual error evaluation value, obtaining a corresponding threshold based on an interval analysis method, further determining whether a fault of the target actuating mechanism occurs in the system and finishing the fault decision of the residual error; finally, synthesizing the fault decision result of each residual error, and determining the specific position of the fault of the actuating mechanism of the system by using a fault separation strategy.

The invention relates to a DC voltage conversion device and a bridge arm control method thereof. The device comprises a basic conversion unit, and a monopolar structure or a bipolar structure is formed by the basic conversion unit, thereby realizing DC energy conversion. The basic conversion unit is formed by two phases or multiple phases of basic function modules in parallel. Through a bridge arm control method, DC energy conversion is realized. Through adopting a method of combining a full-control device serial connection structure and sub module cascading, the topology realizes voltage conversion in a condition of no transformer, soft switching of serially-connected devices can also be realized, and the investment and the land occupation are reduced.

The invention discloses a modularized power cabinet which comprises a control box, an auxiliary circuit, a reactor, a phase module, a cabinet body, a low-inductance busbar A, a busbar, a low-inductance busbar B, a support capacitor, a water outlet pipeline and a water inlet pipeline, wherein the cabinet body is divided into a high-voltage region and a low-voltage region, the low-voltage region and the high-voltage region are isolated by a metal plate, the high-voltage region comprises the phase module, the reactor and the support capacitor, the phase module and the reactor are distributed in the cabinet body from top to bottom, the low-voltage region comprises the control box and the auxiliary circuit, the control box of the low-voltage region is connected with a power device of the phasemodule of the high-voltage region through an optical fiber, the auxiliary circuit can realize connection of all the parts by wiring in the cabinet body, and a water cooling pipeline comprising a water outlet pipe and a water inlet pipe is distributed at the upper end and the lower end of the cabinet body. The power cabinet described by the implementation way is strong in universality and high in degree of integration, and can realize rectification and the inversion function, simultaneously effectively integrates a power unit and a control unit, solves the problems that the power cabinet is bulky so as to be unfavorable for transportation and installation, and is more convenient and reliable for wiring and debugging.

The invention relates to a self-contained underwater sound and hydrological data synchronous acquisition device, system and method. The device includes a first data acquisition module, a second data acquisition module, a control module and a memory module; the first data acquisition module is used for collecting first underwater sound data, converts the first underwater sound data to second underwater sound data and sends to the control module; the second data acquisition module is used for collecting first hydrological data, converts the first hydrological data to second hydrological data and sends to the control module; the control module is used for controlling the first data acquisition module and the second data acquisition module, and sending the second underwater sound data and the second hydrological data to the memory module; and the memory module is used for storing the second underwater sound data and the second hydrological data, so that a main control computer reads the second underwater sound data and the second hydrological data. The device, the system and the method provided by the invention can synchronously obtain underwater sound signals distributed at different depths in a deepwater large-scale range and hydrologicalal environment parameters under deep sea conditions.

The invention discloses a three-phase fault-tolerant inverter circuit and a control method thereof. The three-phase fault-tolerant inverter circuit comprises a direct current power supply and an inverter bridge, the upper bridge arm of a first inverter bridge arm is connected with a high-speed fuse F1 while the lower bridge arm is connected with a high-speed fuse F4, the upper bridge arm of a second inverter bridge arm is connected with a high-speed fuse F3 while the lower bridge arm is connected with a high-speed fuse F6, and the upper bridge arm of a third inverter bridge arm is connected with a high-speed fuse F5 while the lower bridge arm is connected with a high-speed fuse F2; an auxiliary inverter circuit is connected between the direct current power supply and the inverter bridge and is composed of an auxiliary upper bridge arm insulated gate bipolar transistor Q7, an auxiliary lower bridge arm insulated gate bipolar transistor A8, an auxiliary first inverter bridge arm insulated gate bipolar transistor S1, an auxiliary second inverter bridge arm insulated gate bipolar transistor S2, an auxiliary third inverter bridge arm insulated gate bipolar transistor S3 and single-phase bridge rectifiers Z1, Z2 and Z3. The three-phase fault-tolerant inverter circuit and the control method thereof realize to isolate the fault of the bridge arm with short circuit or open circuit fault and have good fault-tolerant running function.

The invention aims to need a power grid frequency-modulating method based on a flexible direct-current transmission system. On the basis of a synchronous motor simulation control strategy of a convertor station, the power grid frequency-modulating method based on the flexible direct-current transmission system comprises the following steps: (1), obtaining an instruction value omega* of output alternating voltage angular frequency of the convertor station; (2), obtaining an instruction value theta of a phase angle of alternating voltage; (3), setting an instruction value of output active power P* of the convertor station; (4), enabling an active power set value to be equal to an active power practical value; and (5), inhibiting transmission of large disturbance between interconnected power grids, and limiting the amplitude of the active power set value. Compared with the prior art, only the variable of the local convertor station is necessary to use; the variable of the opposite convertor station is unnecessary to use; and thus, communication between stations is unnecessary.

The invention discloses an autonomous remotely-operated vehicle (ARV) underwater robot fault diagnosis principal component analysis method and a device used for the method. The device comprises a sensor system, an embedded type controller, an optical transmitter and receiver and a water surface monitoring system, wherein all sensors arranged in the sensor system are connected with a signal input end of the embedded type controller by signal transmission lines; the embedded type controller is connected with a signal input end of the optical transmitter and receiver by an optical fiber; an output end of the optical transmitter and receiver is connected with the water surface monitoring system; and principal component analysis fault diagnosis software is stored in the water surface monitoring system. The analysis device disclosed by the invention fills a gap in the research of reliability control technology which directly serves an underwater robot, and has the characteristics of an untethered autonomous underwater robot and a cable-controlled unmanned underwater robot at the same time, so that the novel unmanned ARV fault diagnosis principal component analysis method and the device used for the method are worked out, and innovation can be realized in the field.

The invention discloses a main and backup power supply fault detection and automatic switching control circuit which comprises a main module power supply and a backup module power supply, wherein the main module power supply and the backup module power supply are connected in parallel with each other; the output ends of the main module power supply and the backup module power supply are both cascaded with isolation circuits of completely identical circuit structures, so that parallel redundancy between two modules of a power supply is realized; the main and backup power supply fault detection and automatic switching control circuit can monitor working states of the main and backup power supplies in real time and realize automatic fault detection and switching between the power supply modules; compared with the conventional relay-control main and backup switching circuit, the main and backup power supply fault detection and automatic switching control circuit has the advantages that the mechanical design difficulty of the module power supplies is reduced, and the reliability of the module power supplies is improved; and the main module power supply and the backup module power supply are mutually controlled, so that the requirement that the main power supply is powered on first under a condition that the module power supplies work normally is met, and a power-on time sequence control circuit is eliminated.

The invention provides a grid-connected micro-grid coordination control system, comprising: a grid coordination controller; In the microgrid, each energy storage unit and each renewable power supply are connected to the microgrid bus through a power supply switch, and each branch of the microgrid bus is provided with a branch outlet circuit breaker. A load switch is connected in series with each load in the microgrid; The micro-grid bus is also connected to the system grid through the grid-connected switch. Each power supply switch, each load switch, each branch outlet circuit breaker and grid-connected switch are respectively provided with a remote terminal device; The grid coordination controller is respectively connected with each energy storage unit, each renewable power source and each remote terminal equipment. The invention is suitable for grid-connected micro-grid, can maintain the stability in the process of unplanned and off-grid handover, and is suitable for practical engineering application.

The invention provides an operation mode of a cascade input-cascade output convertor during a short-circuit load fault of an output end of the convertor by the traditional Y-Y connection method. In the operation control mode, stable operation of a three-phase unity power factor of an input end can be kept during a single-phase short-circuit load fault of the output end. The invention further provides a novel Y-Y connection method and an operation mode of the convertor during open-phase power supply of the input end and the short-circuit load fault of the output end by the novel connection method. With the adoption of the novel Y-Y connection method and the corresponding operation control mode, three-phase stable operation of the output end can be kept during the open-phase power supply of the input end of the convertor, and the stable operation of the three-phase unity power factor of the input end can be kept during the short-circuit load fault of the output end. The operation mode has beneficial effects of realizing fault-tolerant operation and fault isolation of the convertor, improving the power supply reliability, and reducing the economic loss caused by a power supply fault.

The invention discloses a multifunctional detection device while drilling and a preparation method. The device comprises a signal collection module, a signal preprocessing and analysis module, a transmission module and a ground processing and predicting module. Geological information is predicted through comparison of vibration acceleration information of a drill bit with instance data, and the size of a geological area is predicted according to duration time and speed; by means of measurement for temperature, humidity and geological information of the geological environment where the drill bit is located by a temperature and humidity sensor and an infrared sensor, the temperature, the humidity as well as size and position of the geological area are predicted according to the changes of the duration time and speed or position of the drill bit; and advantages of measurement orientation of a gyroscope and a magnetometer are complementary, an azimuth angle can be measured when the magnetic field is abnormal or gyroscope drifting is serious, and fault isolation is achieved. The multifunctional detection device while drilling has the advantages of small size, high vibration resistance, fault-tolerant capability and reliability as well as high-temperature resistance.

The invention relates to an electronic speed regulator and actuator drive circuit for diesel engine duplicated hot-redundancy. The electronic speed regulator and actuator drive circuit for the diesel engine duplicated hot-redundancy is composed of a controller end drive circuit part and a drive adapter plate. The controller end drive circuit comprises a first optical coupler, a first MOS tube, a first voltage stabilizing diode, a second freewheel diode, a first divider resistor, a fourth divider resistor, a second current-limiting resistor and a third current-limiting resistor. The drive adapter plate comprises a drive circuit part and a logic control circuit part. The drive adapter plate end drive circuit comprises a second MOS tube, a third MOS tube and a fifth coil drive selective chip. The core of achieving the fault loop passive cutting-out function is edge D triggers and eight-to-one data selectors, and reliable output of a control loop can be guaranteed through the latch function of the edge D trigger. A control circuit of a control adapter part is achieved through a simulator, and reliability is high.

The invention relates to the field of fault diagnosis, and discloses a traction system main loop grounding fault diagnosis method and system based on characteristic correlation, so as to reduce the influence of measurement noise and transient working condition change on the fault diagnosis performance and improve the accuracy of fault detection and isolation. The method comprises the following steps: selecting a historical operation data training set, and extracting characteristic variables associated with a traction system main loop grounding fault from original data; calculating corresponding characteristic indexes according to the characteristic variables to form a characteristic index data set, and calculating typical correlation analysis parameters and a fault detection threshold by utilizing the characteristic index data set; selecting a historical fault data set to model a fault vector, and constructing a fixed residual error direction library of various faults; and selecting atest data set, calculating a residual error according to the test data set and the typical correlation analysis parameters, comparing the residual error with the fault detection threshold, and if a fault occurs, calculating a residual error direction of fault data and matching the residual error direction with thee fixed residual error direction library to realize fault isolation.

The invention discloses a distributed self-healing control method based on feed line topology automation terminals, and the method is characterized in that the method comprises the steps: dividing a power distribution network into a plurality of control regions, wherein the regions have intersections; The interior of each control region is provided with one feed line topology automation terminal.Each feed line topology automation terminal comprises a collection module, a communication module, a control module, a fault analysis calculation module, a storage module and a power module. The feedline topology automation terminal in each control region takes the feed line topology automation terminal as the circle center and a certain distance as the radius to radiate all terminals in the control region outwards through the Ethernet, obtains the line topology information and operation conditions stored in all terminals in the region, thereby achieving the information interaction. The sameregion can be covered by a plurality of terminals. Meanwhile, the feed line topology automation terminals enable the line topology information and on / off conditions of the control regions where the terminals in the regions and the radiated terminals are located to be stored in a storage module. When a line has a fault, there is no need of real-time interaction, and the main and standby managementis achieved through a priority method, and the control can be achieved through the self-stored topology information. The control method employs a point-to-surface mode, and gradually expands to the whole power distribution network. The method improves the power supply safety, reliability, quality and economical performances of the power distribution network, and effectively improves the emergencycapability of the power distribution network. The method greatly improves the power supply speed of a non-fault region through the stored line topology information.

The invention relates to a submodule structure and MMC topology structure with an AC-DC fault removing capability; two control switches are arranged; the first control switch is connected the submodule topology structure in parallel; the second control switch is connected in series on a connecting line between a voltage anode port or a voltage cathode port of the submodule and the submodule topology structure; when the submodule structure steadily operate, the first control switch is closed, and the second control switch is conducted; when the AC side has faults, the first control switch is triggered to conduct, and the fault current injected in the a MMC can be induced to the ground; when the DC side has faults, the second control switch is controlled to close. Therefore, the submodule structure can realize isolation of AC-DC faults, and can effectively reduce the voltage stress and current stress of the submodule power device. In addition, the scheme is the secondary design reconstruction of an existing submodule, and only small influences can be caused on existing valve tower and valve hall designs; the submodule structure and MMC topology structure is very low in cost, and simple in a realization process.

The invention discloses an intelligent monitoring system for a power distribution room. The measurement and control functions of the low-voltage side and low-voltage outgoing line of a distribution transformer can be realized by using an intelligent controller and a concentrator; detection of phase loss, zero break, overload, electric leakage can be realized; and the releasing of an ordinary molded case circuit breaker can be controlled, so that protection can be performed on personal security and user equipment, and user faults can be prevented from enlarging to affect medium voltage power grids. A controller is connected to the concentrator through zigbee in a wireless manner, and data can be transmitted to a user mobile phone APP through a GPRS after collected by the concentrator, so that the real-time monitoring of the operation states of low-voltage outgoing line switches can be realized; and through the adoption a plurality of technological means such as self-describing protocols, wireless transmission, multi-device cascade, CT open circuit overvoltage protection, clip electricity taking, integral fixation of the controller and CT, on-site installation without power failure,the reduction of line paving due to wireless interconnection, and unified protocols for easy debugging can be realized, so that construction efficiency can be greatly enhanced.

The invention provides composite DC power transmission equipment. The equipment comprises a fault isolation unit including a plurality of first power electronic switch units connected in series, a flow control unit which is connected to the fault isolation unit and is used for controlling the flow distribution between converter stations, and a control unit which is connected to the fault isolationunit and the flow control unit and is used for controlling the flow control unit and the fault isolation unit to execute preset action, wherein each of the first power electronic switch units comprises a first switch branch and a first capacitor, the first switch branch comprises at least two power electronic switches connected in series, and the first capacitor is connected at two ends of the first switch branch in parallel. Through mutually connected DC isolation unit, flow control unit and control unit, the fault isolation of DC power transmission is achieved, compared with a scheme of using a unified power flow controller and a conventional circuit breaker, the cost is saved, the loss is reduced, and the floor space is saved.

The embodiment of the invention discloses a distribution network automation simulation system and a distribution network fault simulation method. The distribution network automation simulation systemcomprises at least one transformer substation module and at least two cable distribution box modules, the cable distribution box modules are connected in series, the output end of the at least one transformer substation module is connected with a bus, and the cable distribution box modules are connected with the bus. Each cable distribution box module comprises a fault signal simulation unit, a terminal unit and a controllable switch, the fault signal simulation unit is used for outputting a fault signal of a set type, the terminal unit is used for acquiring an input signal and an output signal of the cable distribution box module, performing fault diagnosis on a simulation power distribution network segment to which the cable distribution box module belongs based on the input signal and the output signal, and outputting a switch control signal when it is determined that a fault exists in the corresponding simulation power distribution network section; and the controllable switch is connected with the terminal unit and is used for responding to the switch control signal to switch the on-off state of the corresponding simulation power distribution network segment.

The invention discloses a triple-redundant passive independent current mutual inspection power off restarting system and a triple-redundant passive independent current mutual inspection power off restarting method. The triple-redundant passive independent current mutual inspection power off restarting system is constituted by three independent functional board cards, and every board card comprises a passive power off restarting determining module, a filtering module, a power supply module, a current mutual inspection module, and an operation module. By adopting the triple-redundant passive power off restarting determining modules and the triple-redundant current mutual inspection modules, and then the fault isolation and the power off restarting of every single functional board card are realized, and a first-degree fault self-recovery capability is provided. The faulted functional board card is restarted after being powered off, and a latch-up fault is eliminated, and the faulted functional board card can still work normally after being restarted, and then by adopting the power off restarting technology, a one-machine space survival capability is greatly improved.

The invention discloses a temperature consistency prediction method and device, prediction equipment and a storage medium. The method comprises the steps of collecting vehicle state data, wherein the vehicle state data comprise temperature data collected by a common temperature sensor between each group of module monomers and time sequence information; and predicting the temperature consistency among the modules according to the vehicle state data through a prediction model. According to the technical scheme, the temperature consistency between the modules is predicted from the time dimension and the dimensions of different batteries, the phenomenon of temperature imbalance can be conveniently found in time, the safety of power batteries is improved, and fault isolation is achieved to a certain extent.

The invention provides a low-loss modular multilevel converter fault ride-through method. A converter comprises three phase units, each unit is divided into an upper bridge arm and a lower bridge arm,and each bridge arm comprises a plurality of sub-modules which are connected in series. Each sub-module consists of two half-bridge structures, four capacitors and two fly-wheel diodes, the first half-bridge comprises a first switch module and a second switch module, and the second half-bridge comprises a third switch module and a fourth switch module. The cathode of the first switch module is connected with the anode of the second switch module, the cathode of the second switch module is connected with the anode of the third switch module, and the cathode of the third switch module is connected with the anode of the fourth switch module. By utilizing the properties of the reverse-blocking insulated gate bipolar transistors, when a direct-current side inter-electrode short-circuit fault occurs, a two-way switch composed of the reverse-blocking insulated gate bipolar transistors is turned off, and a fault loop is blocked. According to the method, the fault blocking of direct-current side short circuit can be achieved by controlling the on-off of the switch modules, and meanwhile loss is not increased.

The invention discloses an electric propulsion power supply full backup switching circuit and switching method. The circuit comprises a high voltage relay switching circuit, a fault isolation circuit,a command circuit, a telemetric circuit, an input / output interface. An on-off state of the high voltage relay switching circuit is set by a spacecraft instruction, the output power of electric propulsion power supply is transmitted to a power output interface required by a high voltage relay switching instruction after passing through the fault isolation circuit, and telemetry information required by a spacecraft is provided. The electric propulsion power supply full backup switching circuit overcomes the problem of low reliability caused by incomplete backup in the prior art, can realize full backup of two electric propulsion power supply of the spacecraft, and isolates faults of the electric propulsion power supply, thereby improving the reliability of a spacecraft electric propulsion system.

The present invention provides a ROV fault diagnosis principal component analysis device. The present invention relates to the field of the unmanned underwater vehicle state monitoring technology, and discloses a ROV fault diagnosis principal component analysis device. The device comprises a sensor system, an embedded controller, an optical transmitter and receiver and a water surface monitoring system. Each sensor in the sensor system is connected with signal input end of the embedded controller through a signal transmission line, the embedded controller is connected with the signal input end of the optical transmitter and receiver, and the output end of the optical transmitter and receiver is connected with the water surface monitoring system. According to the invention, the search gap of directly serving the unmanned underwater vehicle reliability control technology is filled, and the remotely-operated vehicle (ROV) fault diagnosis principal component analysis method and device are provided to realize innovation in the field.

The invention relates to a disconnection fault detection method based on a wide-area synchronous intelligent sensor. Three-phase current amplitude and phase periodically reported by a wide-area synchronous intelligent sensor are monitored in real time; once obvious disconnection fault characteristics occur, three-phase current waveforms of all wide-area synchronous intelligent sensors installed along a fault line with the disconnection characteristics at the current moment are called, automatic verification and confirmation are carried out, and finally a disconnection fault is detected and positioned. The method solves the problems of disconnection fault detection and positioning of the power distribution network at present.

The invention provides a low-loss modular multilevel converter which comprises three phase units. Each phase unit is divided into an upper bridge arm and a lower bridge arm, each bridge arm comprisesa plurality of sub-modules connected in series, and each sub-module is composed of two half-bridge structures, four capacitors and two fly-wheel diodes. The first half-bridge comprises a first switchmodule and a second switch module, and the second half-bridge comprises a third switch module and a fourth switch module. The negative electrode of the first switch module is connected with the positive electrode of the second switch module, the negative electrode of the second switch module is connected with the positive electrode of the third switch module, and the negative electrode of the third switch module is connected with the positive electrode of the fourth switch module. The invention further provides a converter parameter design method. According to the present invention, the faultblocking of the direct-current side short circuit can be achieved by controlling the on-off of the switch modules, and meanwhile losses are not increased.

The invention discloses a multi-master station token scheduling device based on a MODBUS bus. The device comprises a first interface, a second interface and a controller, the first interface is connected with a main station; the second interface is connected with a slave station and other token scheduling devices through a bus; wherein a first address information configuration table and a second address information configuration table are stored in the controller, the first address information configuration table comprises slave station parameters, self-owned protocol addresses and fixed broadcast addresses, and the second address information configuration table comprises self-owned protocol addresses of other token scheduling devices; and the controller is configured to sequentially obtain the MODBUS bus control right through a preset token rotation mode and communicate with the corresponding main station. Through a token scheduling mechanism of the multi-master-station token scheduling device, MODBUS multi-master-station communication is realized.

The invention discloses a main and backup power supply fault detection and automatic switching control circuit which comprises a main module power supply and a backup module power supply, wherein the main module power supply and the backup module power supply are connected in parallel with each other; the output ends of the main module power supply and the backup module power supply are both cascaded with isolation circuits of completely identical circuit structures, so that parallel redundancy between two modules of a power supply is realized; the main and backup power supply fault detection and automatic switching control circuit can monitor working states of the main and backup power supplies in real time and realize automatic fault detection and switching between the power supply modules; compared with the conventional relay-control main and backup switching circuit, the main and backup power supply fault detection and automatic switching control circuit has the advantages that the mechanical design difficulty of the module power supplies is reduced, and the reliability of the module power supplies is improved; and the main module power supply and the backup module power supply are mutually controlled, so that the requirement that the main power supply is powered on first under a condition that the module power supplies work normally is met, and a power-on time sequence control circuit is eliminated.