561 results about "Secondary circuit" patented technology

The invention discloses a DC voltage divider parameter anomaly detection method based on harmonic characteristics, and the method comprises the steps: deploying an isolation type voltage sensor at a bus of a DC power transmission system, carrying out the voltage sampling through combining with an ADC, carrying out the data buffering and preprocessing, extracting a fundamental wave component and a target harmonic component through the fast Fourier transform, and calculating the harmonic distortion rate. And constructing a low-voltage arm capacitance and harmonic distortion rate model based on a voltage divider secondary circuit equivalent circuit and an energy distribution principle, and calibrating the low-voltage arm capacitance and harmonic distortion rate model. And designing a multi-objective optimization scheduling algorithm based on energy storage capacity and capacitance characteristics, and realizing dynamic power distribution and harmonic suppression of the system. And after abnormal triggering, the system automatically loads a capacitance compensation coefficient, adaptively adjusts algorithm parameters in combination with a measurement loop PI control link, reduces a harmonic amplification effect, and ensures that a measurement error is within an acceptable range. Harmonic monitoring precision and capacitance compensation optimization capability of the direct-current power transmission system are effectively improved, and stable operation of the system is guaranteed.

The invention relates to an electrical equipment fault monitoring and positioning method and system based on data analysis, and belongs to the technical field of electrical equipment monitoring. The method comprises the following steps: sensing a transient traveling wave signal of a fault current by adopting a traveling wave detection technology to determine an initial fault area; acquiring state data of the secondary equipment in the fault area through mapping of the secondary equipment in the fault area; constructing a secondary loop connection model based on the configuration file, and designing an action sequence rule base to verify the action logic and time sequence matching of a regional data centralized protection device, a circuit breaker and a communication link in real time; based on logic verification, action triggering conditions are extracted to be fused with the regional data set; and inputting the fault feature vector into a classification model for fault identification by obtaining the classification model. According to the invention, through traveling wave detection, EEMD decomposition, data synchronization and logic verification, feature information related to the fault is accurately extracted, and through data fusion and real-time learning, the fault identification precision and efficiency are improved.

The invention discloses an airport ground air conditioning unit multi-system energy-saving control method and system, and the method comprises the steps: collecting refrigerant flow data, temperature monitoring data and load demand data of an airport air conditioning system, recognizing a phase change boundary, extracting a gas-liquid conversion point, and carrying out enthalpy value coupling in combination with superheat degree distribution to generate a phase change energy field; identifying heat transfer bottleneck points based on the phase change energy field, generating an equivalent thermal resistance network, and extracting heat capacity characteristic parameters to construct a thermal response path diagram; refrigerant shunting analysis is carried out to extract primary and secondary loops, and an optimal distribution point is identified to generate a load balance matrix; reconstructing a compressor adjusting curve, and identifying a high-efficiency operation interval to generate a frequency conversion adjusting sequence; determining an energy storage window period, and obtaining a dynamic buffer threshold to construct a peak clipping and valley filling instruction set; and an execution deviation track is monitored, the optimal convergence path is recognized, self-adaptive correction is conducted, an energy-saving control instruction is generated, and intelligent multi-system coordination efficient energy-saving control over the airport ground air conditioning unit is achieved.

The invention discloses a current transformer real-time state diagnosis system based on Internet of Things, which relates to the technical field of electrical equipment state diagnosis and comprises a reference construction module, a disturbance excitation module, a modeling identification module, a driving unwrapping module, a self-adaptive setting module and a closed-loop control module, in the operation process of a secondary winding loop of the current transformer, a nanosecond time synchronization reference is established, a phase reference baseline is locked, current vector trajectories are continuously collected based on the time synchronization reference and the phase reference baseline, and a discrete phase residual image is constructed. According to the method, through high-precision time synchronization, phase disturbance excitation, sparse modeling identification, driving unwrapping and self-adaptive setting control, hysteresis oscillation of the secondary circuit of the current transformer is accurately identified and suppressed, the fault diagnosis accuracy and the system stability are remarkably improved, and the limitation of a traditional method in the aspects of identification sensitivity and response capability is broken through.

The invention discloses a bidirectional CLLC resonant converter with a wide input and output voltage range, and relates to the technical field of bidirectional DC / DC converters in the field of switching power supplies. According to the bidirectional CLLC resonant converter, bidirectional switching bridge arms are added to a primary circuit and a secondary circuit in a conversion main circuit respectively; the control circuit performs pulse frequency control on a switching tube in the LLC resonant network and also performs duty ratio control on the bidirectional switching bridge arm circuit, so that the gain range of the resonant converter can be further widened on the basis of performing pulse frequency control on the LLC resonant network, and meanwhile, the whole-process soft switching can be realized, and the reliability of the resonant converter is improved. And the efficiency of the converter is improved.

A safety circuit for a high-voltage electrical traction system comprising a plurality of electric machines. The safety circuit comprises a primary high voltage interlock loop (HVIL) circuit configured to be connected to a battery and for each of the plurality of electric machines, a secondary high voltage interlock loop (HVIL) circuit, wherein each secondary HVIL-circuit is controlled by a corresponding switch unit configured to break the secondary HVIL-circuit if a fault in a corresponding electric machine is detected, and wherein the switch unit comprises a trigger device configured to break the primary HVIL-circuit if the switch unit is opened.

A method and circuit for controlling a bidirectional resonant direct-current converter are provided. The method includes obtaining an input and / or output electrical parameter of the converter; determining respective delay time periods of bridge arms in the secondary circuit based on the input and / or output electrical parameter and a desired gain of the converter; determining a switching frequency to be greater than a resonant frequency of the resonant tank based on the input and / or output electrical parameter and a preset reference signal; and turning off, in response to a secondary resonant current of the converter reaching zero, corresponding switching transistors of the switching transistors in the secondary circuit immediately after the respective delay time periods starting from a zero-crossing point; and turning on other switching transistors complementary to the turned-off switching transistors in the secondary circuit immediately after a dead time.

The invention discloses a nuclear power plant secondary side cleanliness evaluation and radiation shielding method. The method comprises the following steps that S1, whole secondary circuit system equipment of a steam generator is washed; s2, full-coverage cleanliness inspection is carried out in the range from a filter screen of the electric main water feeding pump system to the secondary side of the steam generator, and meanwhile, if foreign matter is found, a cleaning tool is used for picking up the foreign matter; s3, evaluating the cleanliness condition, and if the cleanliness is qualified, ending; if the cleanliness is not qualified, returning to the step S1; s4, if the foreign matter falls off after the steam generator runs, stopping the equipment, and filling the secondary side of the steam generator with water to a preset position for reducing the radiation dose; and S5, picking up foreign matters by using a cleaning tool. Full-coverage cleanliness inspection is carried out in the range from the filter screen of the electric main feed pump system to the secondary side of the steam generator, effective verification of the secondary loop foreign matter flushing effect and radiation shielding when necessary are achieved, and foreign matter remaining on the secondary side of the steam generator is avoided.

The embodiment of the invention provides a multi-output isolated power supply, which comprises a power transformer comprising a single primary side coil and a single secondary side coil; a switch driving circuit coupled to the primary coil to output a driving voltage to the primary coil based on the input voltage; a rectification circuit coupled to the secondary coil and configured to rectify a voltage across the secondary coil to output a first DC voltage at a first rectified voltage output end and a second DC voltage at a second rectified voltage output end; and an output unit coupled to the first rectified voltage output terminal and the second rectified voltage output terminal, the output unit comprising one or more low dropout linear regulator circuits, where an output terminal of a predetermined low dropout linear regulator circuit is coupled to the secondary circuit ground, the output unit is configured to output at least one positive voltage and at least one negative voltage with a voltage at an output terminal of a predetermined low dropout linear regulator circuit as a reference.

An AC-AC converter is provided. The AC-AC converter includes a primary circuit, a secondary circuit, a transformer, a resonant tank, and a controller. The primary circuit includes four bidirectional switches, each including upper and lower switches connected back-to-back and capable of operating in four quadrants in a voltage-current plane. The first and fourth bidirectional switches operate synchronously, and the second and third bidirectional switches operate synchronously. When the input voltage is greater than a predefined threshold voltage, the first and second lower switches are maintained in an on state, and the first and second upper switches operate with PWM signals and are complementary to each other. When the input voltage is smaller than an additive inverse of the predefined threshold voltage, the first and second upper switches are maintained in the on state, and the first and second lower switches operate with PWM signals and are complementary to each other.

The present invention discloses a nanocrystalline current transformer with DC component resistance and a method for using the same, comprising: a current transformer having a magnetic core hole extending from front to back in the middle of the front side of the current transformer. The device is provided with a secondary-side disconnection detection and protection mechanism, which effectively prevents the internal magnetic field imbalance of the transformer caused by the disconnection of the secondary circuit, avoids the core magnetic flux saturation and the generation of potential high electromotive force, thereby protecting the transformer itself and peripheral equipment, and reducing the risk of power system failures such as fire or short circuit. At the same time, a live conductor centering fixing mechanism is provided to ensure the stable centering position of the conductor in the transformer core hole, optimize the magnetic field distribution, reduce magnetic leakage, significantly improve the accuracy and stability of current measurement, and reduce measurement fluctuations introduced by conductor shaking, providing more accurate data support for harmonic analysis, fault detection, and power quality monitoring of the power system.

The invention belongs to the technical field of switching power supplies, and provides a multi-output flyback converter with a low cross regulation rate, which comprises a primary side loop comprising a switching tube and a primary side winding of a transformer, and the switching tube is used for controlling the energy transfer of the transformer; the secondary loop comprises a main output loop, a first secondary output loop and a second secondary output loop, the main output loop comprises a secondary winding of the transformer, and the secondary winding of the first secondary output loop is led out from the secondary winding of the main output loop through a tap; a secondary winding of the second secondary output loop is connected with an inductor; two ends of the inductor are connected with an energy absorption loop in parallel; and the feedback control loop is used for acquiring the sampling voltage of the main output loop, comparing the sampling voltage with the reference voltage, and controlling the output voltage of multi-path output by controlling the duty ratio of a switching tube. According to the flyback converter, the low cross adjustment rate of multi-path output of the flyback converter is realized, and mutual interference among the multi-path output is avoided.

The invention discloses an all-in-one power supply device, a power assembly and an electric vehicle, and relates to the technical field of new energy automobiles. The all-in-one power supply device comprises a vehicle-mounted charger circuit, a three-phase inverter circuit and a switch unit. The vehicle-mounted charger circuit comprises a primary side circuit, a resonant cavity and a secondary side circuit, the primary side circuit is used for converting alternating current output by an alternating current power supply into direct current, the primary side circuit is further used for carrying out power conversion on the direct current together with the resonant cavity and the secondary side circuit, and the secondary side circuit is used for charging a power battery of an electric vehicle. The three-phase inverter circuit is used for receiving power supplied by the power battery and supplying power to a driving motor of the electric vehicle. And the switch unit is used for selectively conducting connection between the middle points of the two bridge arms of the secondary circuit and the resonant cavity or between the middle points of the two bridge arms of the three-phase inverter circuit. The secondary side circuit of the single-stage vehicle-mounted charger is reused to supply power to the driving motor, reuse of a high-specification power tube is achieved, power density is improved, the size and weight of the all-in-one power supply device are reduced, and cost is saved.

The embodiment of the invention discloses a pressure control method and system for a once-through steam generator of a nuclear reactor, and relates to the technical field of nuclear power. Determining power deviation according to the operation power and the secondary circuit load; according to the power deviation, the rated power corresponding to the nuclear reactor and the rated feed water flow corresponding to the once-through steam generator in the nuclear reactor, pressure regulation information is determined; and adjusting the pressure of the once-through steam generator according to the pressure adjusting information. According to the embodiment of the invention, a PID controller is not needed in the process of determining the pressure regulation information, but the pressure regulation information determined based on the power deviation directly acts on the feed water flow regulation valve, so that rapid and accurate OTSG pressure control can be realized.

The invention discloses a zero-sequence current acquisition and analysis device and method for a power secondary circuit, and belongs to the field of power systems. The device comprises a current transformer, a temperature sensor, a front-end analog filter, an ADC, a rear-end digital filter, a self-adaptive wave trap, a processor and an alarm. Wherein the output end of the current transformer is connected to the processor through the front-end analog filter, the ADC and the rear-end digital filter in sequence; and the processor is also respectively connected with the temperature sensor and the alarm. According to the invention, real-time acquisition and early warning of the zero-sequence current are realized, and high precision and stability of an acquisition result in a full temperature range are ensured at the same time.

The utility model relates to a system device for secondary loop dosing, which relates to the field of secondary loop dosing and comprises an ammonia source end, a water source end, at least two ammonia metering devices connected in parallel and at least one dosing end. The ammonia source end is connected with at least two ammonia metering devices which are connected in parallel through a pump and a switch valve; the water source end is connected with at least two ammonia metering devices which are connected in parallel through a switch valve; the at least two ammonia metering devices which are connected in parallel are connected with at least one dosing end through a switch valve. According to the system device provided by the utility model, the dosing system of the secondary loop is redesigned, and the ammonia metering equipment connected in parallel is adopted, so that the defect of unstable operation of the secondary loop caused by fluctuation of the dosing amount in the switching process is avoided, the usability of thermodynamic system equipment is improved, the service life of the thermodynamic system equipment is prolonged, and long-term and stable operation of a power plant is ensured.

The invention relates to a system (10) for de-icing the blades (14) of the propeller (12) of an aircraft, the system comprising an H-bridge inverter device (40); a rotary transformer (22) comprising a main primary winding (26), a primary measurement winding (28), and a secondary circuit (30) delivering a secondary alternating voltage (Vs); a rectifier device (50); a de-icing device (20); a control device (60) configured to control the switching elements of the inverter device in an out-of-phase manner, using the value of the voltage (Vpm) across the terminals of the primary measurement winding, measured during a measurement interval of predetermined duration starting at the instant (t11,t33) when the inverter device switches from a controlled state to a short-circuit state.

The invention provides an online power supply switch mutual inductor fault detection method and system, a medium and a product, and relates to the technical field of online monitoring and fault diagnosis of power equipment, and the method comprises the steps: generating a synchronous triggering instruction at the zero crossing point moment of the power frequency current of a mutual inductor; in response to the instruction, injecting an excitation pulse into a secondary circuit of the mutual inductor and synchronously acquiring a feedback voltage to obtain a mixed transient signal; extracting a pure response waveform only containing a high-frequency component from the mixed transient signal to carry out multi-resolution time-frequency transformation, and calculating and outputting a multi-dimensional feature vector representing a winding state; inputting the multi-dimensional feature vector into a pre-trained neural network model for classification operation to obtain a fault classification probability of the current transformer state; and comparing the fault classification probability with a preset confidence threshold to generate a fault diagnosis result of the mutual inductor. By implementing the method, the recognition sensitivity of the system on early weak faults and high-frequency distribution parameter changes of the mutual inductor can be improved.

The invention discloses a transformer substation secondary circuit drawing intelligent processing method and system, belongs to the technical field of electric power system digitization, and aims to solve the problems that the missing detection and false detection rate of old fuzzy drawings is high, a deep learning model lacks topological semantic understanding, full-process automation is insufficient, and structural management is lacked in conventional secondary circuit drawing processing. According to the core scheme, the method comprises the steps of segmenting an image through a U-Net network to generate masks, generating a structured topology table in combination with a primitive database, converting the structured topology table into nodes and directed edges with electrical attributes, constructing a queriable graph database integrating version management, rule check and a layout optimization algorithm, and finally generating a standard format drawing. According to the scheme, the primitive recognition and topology analysis precision is improved, deep mapping from images to electrical logic is achieved, full-process automation is achieved, version tracing and rule verification are supported, and standardized drawings are produced.

The invention discloses a complete-cycle health maintenance method, system and device for secondary circuit equipment and a medium, and the method comprises the steps: obtaining the operation data of the secondary circuit equipment, and dividing the operation data into an initial data set and an incremental data set; constructing an initial health prediction model by using the initial data set, and predicting the residual service life of the secondary circuit equipment; according to an incremental learning algorithm, updating the initial health prediction model by using an incremental data set to obtain an updated health prediction model; and performing health state evaluation and residual service life prediction on the secondary circuit equipment by using the updated health prediction model, thereby realizing complete-cycle health maintenance of the secondary circuit equipment, automatically adjusting an incremental learning strategy according to the change of an equipment operation environment, and improving the adaptability of the system.

A vehicle includes: a drive system having a motor; an inverter arranged in an upper portion of the drive system; and a DC bus bar connecting a circuit section of the inverter and a DC connector. An inverter housing has: a housing main portion extending in a front-rear direction along the drive system; and a downward protruding portion protruding downward from a front end portion of the housing main portion. The circuit section includes: a main circuit component arranged other than in a rear end area overlapping the downward protruding portion in a plan view; and a secondary circuit component arranged in the rear end area, and the DC bus bar is connected to the circuit section in the downward protruding portion.

According to the integrated thermal management method for the secondary circuit of the new energy automobile, mechanical abrasion or electrical faults are accurately recognized by monitoring the rotating speed and the current signal of the main water pump in real time, and the standby water pump is rapidly switched to guarantee circulation continuity of cooling liquid; meanwhile, the opening degree of the electric control valve is dynamically adjusted to optimize flow distribution of each branch, and the temperature of the battery is maintained in a safe interval in combination with multi-point temperature data fusion processing; in addition, by means of branch isolation and bypass channel switching, local faults can be handled in time, and the overall cooling capacity is maintained. According to the invention, the stability and safety of the thermal management system in multiple scenes are obviously improved.

A signal transmission device includes: a signal transmission circuit that transmits a pulse signal from a primary circuit system to a secondary circuit system in an isolated manner; a power supply circuit that generates an output voltage from an input voltage in an isolated manner; first and second abnormality detection circuits that detect an abnormality in the primary circuit system and secondary circuit system; a signal transmission path that transmits an output of the second abnormality detection circuit from the secondary circuit system to the primary circuit system in an isolated manner; and a self-diagnosis circuit that performs self-diagnosis on each of the first and second abnormality detection circuits and the signal transmission path. The first abnormality detection circuit includes, as a diagnostic target, a power supply abnormality detector that detects an abnormality in the power supply circuit. The self-diagnosis circuit first diagnoses on the power supply abnormality detector.

The invention provides an electric power secondary circuit multi-parameter intelligent detection system and method based on edge computing, the system comprises a composite sensing array, a self-adaptive probe system and an edge computing system, the composite sensing array comprises a plurality of sensors, the self-adaptive probe system comprises a multi-direction adjustable probe array, and the multi-direction adjustable probe array is connected with the edge computing system. The tail end of each probe in the multidirectional adjustable probe array is embedded into the permanent magnet, and the multidirectional adjustable probe array transmits the acquired electrical signals of the terminal strip to be tested to one or more of the plurality of sensors through the multiplexer; and the composite sensing array and the adaptive probe system are connected with the edge computing system, so that the detection efficiency is effectively improved.

The device comprises a to-be-disassembled electric energy meter, an electric energy meter replacing module detection box and a junction box, the to-be-assembled electric energy meter is placed on one side of the to-be-disassembled electric energy meter, and electric energy meter wire inserting ends are arranged on the inner side of the to-be-disassembled electric energy meter; the inner side of the electric energy meter wire plugging end is provided with a connecting wire, and the bottom of the connecting wire is connected with a junction box. The top of the junction box is covered with an electric energy meter replacement module detection box; the electric energy meter replacement module detection box has auxiliary functions of voltage monitoring, current monitoring, contact temperature monitoring, contact pressure control, overvoltage protection, current loop open circuit prevention, reliable wiring detection and the like. By using the device, an old electric energy meter needing to be dismounted and a new electric energy meter to be replaced are simultaneously connected in a metering secondary loop, the two meters operate simultaneously, numerical values are combined for metering, the purpose of continuous electric quantity metering in the meter replacing process is achieved, and the problem of electric energy metering loss is effectively avoided.

The invention discloses an integrated secondary circuit thermal management system for an electric automobile. Comprising a water-cooling evaporator, a gas-liquid separator, a compressor, a water-cooling condenser and an electronic expansion valve which are sequentially connected to form a refrigerant loop, and a passenger compartment water loop, a battery water loop and a motor water loop which are respectively connected with the water-cooling evaporator and the water-cooling condenser through a first four-way valve and a second four-way valve. A one-dimensional architecture diagram is adopted, the architecture arrangement of the motor, the motor water loop and the battery water loop is reasonably designed, multiple waste heat recovery modes are experimented, the waste heat of the motor is fully utilized, the energy efficiency of the system is improved in a low-temperature environment, unnecessary parts are reduced, and the complexity and cost of the system are reduced.

The embodiment of the present application provides a resonant power supply, a primary feedback excitation power supply controller and method, and a control device, which relate to the field of power supply technology and are used to simplify the secondary circuit of the rotary transformer in the process of controlling the current and voltage output by the rotary transformer. In the resonant power supply, the bridge circuit is electrically connected to the power supply, and the bridge circuit is used to convert the direct current provided by the power supply into a square wave signal according to the drive signal. The LC series resonant network is electrically connected to the bridge circuit and the primary winding, and the LC series resonant network is used to convert the square wave signal into alternating current and output it to the primary winding. The alternating current includes an input voltage V t and input current I r The rectifier bridge is electrically connected to the secondary winding and is used to convert the AC power on the secondary winding into DC power. The primary feedback excitation power supply controller is used to receive the input voltage V t and input current I r and outputs the above driving signal to the bridge circuit.

A control method and a control circuit for a bidirectional resonant direct-current converter are provided. The control method includes determining a zero-crossing point of a secondary resonant current of the bidirectional resonant direct-current converter, determining, for a switching transistor to be turned off in the secondary circuit within each half cycle of the secondary resonant current, a turn-off start time instant of the switching transistor as an end time instant of a preset delay duration starting from the zero-crossing point; and determining, for a switching transistor to be turned on in the secondary circuit within each half cycle of the secondary resonant current, a turn-on start time instant of the switching transistor as an end time instant of a dead time starting from the turn-off start time instant of the switching transistor complementary to the switching transistor to be turned on.

The invention discloses a secondary loop heat management system and a vehicle, the secondary loop heat management system comprises a refrigerant loop, a plurality of water cooling loops and a controller, one part of the plurality of water cooling loops is connected to a first multi-way valve, and the other part of the plurality of water cooling loops is connected to a second multi-way valve; a plurality of channels are formed in the first multi-way valve and the second multi-way valve, each channel communicates with the input end and the output end of the water cooling loop, part of the water cooling loop exchanges heat with the refrigerant loop, and the water cooling loop is used for controlling the temperature of the vehicle; and the controller is in control connection with the first multi-way valve and the second multi-way valve and is used for controlling the on-off of the plurality of channels, so that the thermal management system has a plurality of working modes. According to the technical scheme, the controller and the multi-way valve are used for regulating and controlling the on-off of the multiple water cooling loops, the flow path of the heat management system can be simplified, and the cost is reduced.

The embodiment of the invention discloses a secondary integrated chip, an integrated circuit package and a charging device, a power supply circuit comprises a primary coil and a secondary coil, the primary coil is coupled with the secondary coil, and the secondary coil is connected with an output port. The secondary integrated chip comprises a substrate, a synchronous rectification circuit, a synchronous rectification control circuit, an output control circuit and a protocol circuit, and the synchronous rectification circuit is arranged on the substrate and connected with the secondary coil; the synchronous rectification control circuit is arranged on the substrate and is connected with the secondary coil and the synchronous rectification circuit; the output control circuit is arranged on the substrate and is connected with the secondary coil and the output port; and the protocol circuit is arranged on the substrate and is connected with the secondary coil, the output control circuit and the output port, so that the number of electronic components in the secondary circuit can be reduced, the overall secondary circuit is relatively simple, a circuit board is relatively small, the charging device is relatively small, and the miniaturization of the charging device is realized.