356 results about "Secondary circuit" patented technology

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.

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 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 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.

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.

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.

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 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.

A power supply circuit generates from the input voltage of a primary circuit system the output voltage of a secondary circuit system by driving a switching output stage. The power supply circuit includes: a pulse feedback signal generation circuit that generates a pulse feedback signal corresponding to the output voltage; an analog control signal generation circuit that generates an analog control signal corresponding to the pulse feedback signal; and a switching driving control circuit that drives the switching output stage according to the result of comparison of the analog control signal with a slope signal. The analog control signal generation circuit raises the maximum value (an internal supply voltage) of the analog control signal with a predetermined gradient during the start-up or renewed start-up of the output voltage.

A resonant converter is provided. The resonant converter includes a primary circuit, an integrated transformer, a secondary circuit, a local ground, a first Y capacitor and a second Y capacitor. The primary circuit has a first positive line and a first negative line. The integrated transformer is electrically connected to the primary circuit. The secondary circuit is electrically connected to the integrated transformer and has a second positive line and a second negative line. The first Y capacitor is coupled between the local ground and the first positive line or the first negative line of the primary circuit. The second Y capacitor is coupled between the local ground and the second positive line or the second negative line of the secondary circuit. The first Y capacitor, the second Y capacitor and the local ground are configured to circulate common mode noise currents between the primary circuit and the secondary circuit.

The application provides a voltage converter. The voltage converter comprises a primary circuit, a secondary circuit and a discharge control unit. The secondary circuit comprises a first MOS tube and an output capacitor. The first MOS tube is connected with the discharge control unit. The discharge control unit is used for controlling the first MOS tube to work in a linear region when the voltage converter is in a shutdown state or an abnormal protection state. In the technical scheme, after the voltage converter stops working, the first MOS tube is controlled to work in the linear region, so that the first MOS tube consumes the residual voltage on the output capacitor in the voltage converter as a resistance. In this way, when the voltage converter is started, the pre-bias voltage is reduced or disappears, so that an excessively large reverse current is avoided, and thus the failure of components in the voltage converter is avoided.

The invention relates to a system (100) for storing and producing energy, comprising a primary circuit (10) for thermal storage, via a primary volume (12), of a high-enthalpy fluid, the circuit also comprising at least a circulation pump and a primary circulation valve (17), the system comprising a secondary circuit (20) for producing energy via the high-enthalpy fluid of the primary circuit, and comprising a connection valve (27) connecting the two circuits (10, 20), the system operating according to two configurations: - a first configuration, with the primary circuit (10) isolated from the secondary circuit (20) by closing the valve (27), and maintaining the fluid under fixed thermodynamic conditions; and - a second configuration, with the primary circuit (10) open to the secondary circuit (20) by opening the valve (27), allowing the diffusion of the fluid in order to actuate energy production.

The application belongs to the technical field of heat supply equipment, and provides a regional heat supply mixing tank based on turbulence structure optimization, which comprises a first turbulence component and a second turbulence component arranged in a tank body along a water flow direction; the first turbulence component is located behind a low-temperature water inlet and behind a high-temperature water inlet, and is used for blocking the channel of cold water sticking to the bottom and actively inducing to the middle or upper part of the tank body; the second turbulence component is located in front of a medium-temperature water outlet, and is used for forcibly turning and cutting the mixed fluid about to flow out, so as to realize the thermal deviation homogenization of the mixed fluid. The mixing tank is used for hydraulic decoupling and heat mixing of a primary circuit and a secondary circuit of a heat network, and the internal turbulence structure is additionally arranged and optimized to eliminate the thermal stratification phenomenon in the tank, and then the temperature uniformity of the water outlet is improved.

Temperature control system for temperature-controlling a room, comprising: a primary circuit (11); a secondary circuit; a first heat exchanger (1) with a primary side (10) and a secondary side (12), wherein the first heat exchanger (1) is configured to couple the primary circuit (11) and the secondary circuit, and wherein the primary circuit (11) is configured to extract heat from the secondary side (12) of the first heat exchanger (1) via the primary side (10) of the first heat exchanger, wherein the secondary circuit comprises: the secondary side (12) of the first heat exchanger (1); a manifold (2) which, in operation of the temperature control system, is arranged below (60) the secondary side of the first heat exchanger (1); a pump (3) which is coupled to the manifold (2);and a second heat exchanger (4) which, during operation of the temperature control system, is arranged in thermal interaction with the space (5) to be temperature controlled and is located above the collector (2); and a secondary fluid (50) which, during operation of the temperature control system, is arranged in the secondary circuit and is pressurized such that a phase change from a liquid secondary fluid to a vaporous secondary fluid takes place in the second heat exchanger (4) and a phase change from the vaporous secondary fluid to the liquid secondary fluid takes place in the secondary side (12) of the first heat exchanger (1).

The invention discloses a pulsating voltage-based current transformer secondary circuit disconnection fault detection method, and belongs to the technical field of power distribution network fault detection. According to the invention, the correlation between the real-time voltage signal induced by the voltage transformer and the reference voltage is considered on the basis of the current transformer secondary circuit disconnection difference current criterion; the method has the core effects that the current transformer secondary circuit disconnection fault and the high-resistance grounding fault of the power transmission current are distinguished according to the pulsation rhythm with the specific length in the correlation coefficient between the real-time voltage signal and the reference voltage information, so that the small-amplitude sinusoidal current distinguishing capability of a power transformation secondary system device is improved; and the detection accuracy of the secondary circuit disconnection fault of the current transformer of the power transmission line is greatly improved.

A bidirectional DC / DC converter according to an embodiment of the present invention comprises: a transformer; a primary-side circuit connected to one side of the transformer and including a full-bridge circuit composed of first to fourth switches, a first resonant inductor, a magnetizing inductor, and a first resonant capacitor; and a secondary-side circuit connected to the other side of the transformer and including a full-bridge circuit composed of fifth to eighth switches, a second resonant inductor, a second resonant capacitor, and a third capacitor. In a mode in which power is supplied from the secondary-side circuit to the primary-side circuit among operation modes of the bidirectional DC / DC converter, the sixth switch is set to OFF, the eighth switch is set to ON, and the fifth switch and the seventh switch may be turned ON / OFF according to a first switching frequency.

The invention discloses a mutual inductor secondary circuit defect identification method and apparatus, a terminal device and a storage medium. The method comprises the steps of obtaining a secondary voltage waveform signal of a to-be-identified mutual inductor; performing Fourier transform according to the secondary voltage waveform signal to obtain a fundamental component and a harmonic component; judging whether a harmonic amplitude condition is met or not according to the harmonic component to obtain a first judgment result; according to the secondary voltage waveform signal, determining a corresponding waveform zero point and a wave crest; according to the secondary voltage waveform signal and the waveform zero point, judging whether a waveform abnormal condition is met or not, and obtaining a second judgment result; judging whether a fundamental wave amplitude condition is met or not according to the wave crest and the fundamental wave component to obtain a third judgment result; and obtaining a secondary circuit defect identification result of the mutual inductor to be identified according to the first judgment result, the second judgment result and the third judgment result. According to the invention, the monitoring efficiency of the power system is improved.

This application relates to the field of relay protection technology, specifically disclosing a method, apparatus, equipment, and storage medium for evaluating secondary circuits. The method includes the following steps: obtaining an estimated fault distance associated with a fault event to be tested; determining the expected response range corresponding to the fault event based on the estimated fault distance; extracting the actual action set; performing a consistency check between the action set corresponding to the expected response range and the actual action set to obtain a consistency check conclusion; and outputting the evaluation result corresponding to the fault event based on the consistency check conclusion. By obtaining the estimated fault distance and determining the expected response range, the evaluation object is narrowed from the entire line bay to the responsibility domain corresponding to the fault location, reducing the probability of misjudgment in secondary circuit evaluation. The automated evaluation process, with fault distance as the core constraint and employing consistency check, improves the efficiency and stability of fault evaluation.

The invention relates to a redundancy switching system (1) for supplying electrical energy to at least a primary load (2) and a secondary load (4) in a vehicle (100). The redundancy switching system (1) has a primary switching assembly (8) and a secondary switching assembly (10), the primary switching assembly (8) being designed to close or interrupt a primary circuit (12) between the main energy source (6) and the primary electrical load (2), and the secondary switching assembly (10) being designed to close or interrupt a secondary circuit (14) between the main energy source (6) and the secondary electrical load (4). The redundancy switching system also has at least one primary control device (16) for switching the primary switching assembly (8) and the secondary switching assembly (10) and a secondary control device (18) for switching the primary switching assembly (8) and the secondary switching assembly (10). The invention relates to a method for redundantly supplying energy to electrical loads in a vehicle (100) and to a vehicle (100) having a redundancy switching system (1).

The invention belongs to the field of power supply and distribution, and particularly relates to a method for monitoring and identifying a broken line grounding fault in a high-voltage winding of a distribution transformer in a Dyn wiring mode in real time. The method comprises the following steps: S1, monitoring high-voltage side zero-sequence voltage and low-voltage side voltage data of the distribution transformer in real time; s2, obtaining high-voltage side zero-sequence voltage data, and setting the high-voltage side zero-sequence voltage data as a judgment basis 1; s3, synchronously collecting three-phase voltage of a low-voltage side, and designing a judgment basis 2; and S4, in combination with the judgment basis 1 and the judgment basis 2, diagnosing the internal condition of the high-voltage winding in the corresponding transformer, and correspondingly prompting the fault condition. High-voltage side data are collected through a voltage transformer, and low-voltage side data are collected in real time through an existing port meter or a low-voltage fusion terminal. Zero-sequence voltage is calculated through high-voltage-side three-phase voltage data collected by a voltage transformer, or the zero-sequence voltage is directly measured through a secondary circuit opening triangle of the voltage transformer, and generation of the high-voltage-side zero-sequence voltage serves as a starting condition.

Title: Three-Temperature Heat Machine The present invention relates to a heat machine, comprising a primary circuit in which a primary fluid can circulate, and said primary circuit comprises and connects in order a primary compressor (1), a first primary heat exchanger (11), a primary expansion valve (12), a second primary heat exchanger (14), and said primary compressor (1), said machine comprising a secondary circuit in which said primary fluid can circulate, and said secondary circuit comprises and connects in order a secondary compressor (15), a first secondary heat exchanger (16), said primary expansion valve (12), a second secondary heat exchanger (18) and said secondary compressor (15), characterized in that said primary expansion valve (12) is equipped with a movable expansion valve element, configured to be set in motion by the energy supplied by the primary fluid,and said secondary compressor (15) is provided with at least one movable compressor part, and said compressor part is mechanically, hydraulically, or magnetically connected to said expansion valve part. Figure from the abstract: Figure 1,

The invention discloses a two-wire pulse method low-voltage CT transformation ratio tester and an implementation method, and belongs to the technical field of CT transformation ratio testing. The two-wire pulse method low-voltage CT transformation ratio tester comprises a host and accessories, and the host is used for sending pulse current, actively sending pulse current signals to a primary power supply loop and detecting and calculating the transformation ratio of a current transformer in combination with pulse current signals in a secondary loop; the accessory is used for assisting the host to complete the transformation ratio test of the current transformer. According to the invention, the problems that the clamp meter is difficult to clamp in place during measurement in the prior art and the test cannot be carried out when the field load is relatively low or almost no load exists are solved. According to the invention, the transformation ratio test is carried out in a mode of actively sending the current, the limitation of dependence on natural load current in the traditional transformation ratio test is overcome, and the method is especially suitable for the test under a low-load or no-load condition.

The application provides a relay protection secondary circuit plunger voltage measurement training device, which comprises a portable training device body and a control circuit arranged in the training device body; the control circuit comprises a tripping circuit for simulating a tripping state and a closing circuit for simulating a closing state; in the simulation circuit, an intermediate relay is connected in series with an auxiliary contact of a reset button, two micro switches are connected in series at the upper and lower ends of the plunger respectively; the reset button and the micro switch connected in series at the upper end of the plunger are connected with one end of a change-over switch, the other end of the change-over switch is connected with a negative pole of a power supply through an intermediate relay coil, the intermediate relay and the micro switch connected in series at the lower end of the plunger are connected with a positive pole of the power supply. The application can realize portable training, and can help operation personnel to clearly master the plunger potential of the protection device of the circuit breaker under different conditions, and help to prevent the plunger misoperation and omission from the source.

The invention relates to a redundant switching system (1) for supplying electrical power to at least one primary consumer (2) and one secondary consumer (4) in a vehicle (100). The redundant switching system (1) comprises a primary switching arrangement (8) and a secondary switching arrangement (10), wherein the primary switching arrangement (8) is configured to close or open a primary circuit (12) between the main power source (6) and the primary electrical consumer (2), and wherein the secondary switching arrangement (10) is configured to close or open a secondary circuit (14) between the main power source (6) and the secondary electrical consumer (4).It further comprises at least one primary control unit (16) for switching the primary switching arrangement (8) and the secondary switching arrangement (10) and a secondary control unit (18) for switching the primary switching arrangement (8) and the secondary switching arrangement (10). The invention relates to a method for the redundant power supply of electrical consumers in a vehicle (100) and a vehicle (100) with a redundant switching system (1).

The invention relates to a heat exchanger / reactor or heat exchanger comprising: - a main body (1) having, over at least one axial portion thereof, the general shape of a cylinder of revolution about a central axis (Y), the body (1) comprising: • a primary circuit comprising a plurality of primary layers (10) each comprising at least one primary channel (12), • a secondary circuit (25) comprising a plurality of secondary layers (20) each comprising at least one secondary channel (22), the secondary channel (22) extending longitudinally in a radial direction towards the side wall (4) of the body (1), and • a plurality of isthmuses (30), wherein the primary and secondary layers, separated by isthmuses, are distributed among a plurality of sectors (40), at least one of which sectors (40) comprises • a primary layer extending radially along a non-rectilinear primary axis of extension (Yp), and • a secondary layer extending along a non-rectilinear secondary axis of extension (Ys).