523 results about "Capacitor voltage" patented technology

The invention belongs to the field of storage, and discloses a high-energy-efficiency mixed-precision charge domain in-storage computing architecture and a working method thereof. Comprising a single-slope analog-to-digital converter, a sparsity perception input alignment module, a multi-bit input accumulation module, a controller and an accumulation module, wherein the single-slope analog-to-digital converter consists of an index calculation array, a mantissa calculation array, a shared ramp voltage generator and a bidirectional counter. According to the invention, serial input binary coding based on capacitor voltage is suitable for floating point and integer multiply-accumulate operation with flexible bit width; according to the invention, a shared single-slope analog-to-digital converter (SS-ADC) is introduced to realize maximum index search and index difference calculation; according to the method, a sparsity perception calculation scheme is provided, low-importance input-weight pairs are filtered out through an adjustable threshold value, and invalid power consumption is reduced; according to the method, a multi-bit input accumulation method is further combined, and an ADC redundancy optimization quantization and normalization process is utilized, so that the overall energy efficiency is improved.

The invention belongs to the technical field of power electronic conversion, and particularly discloses an MMC-STATCOM system direct optimization model prediction control method and system, and the method comprises the steps: respectively calculating a differential mode voltage and a common mode voltage between an upper bridge arm and a lower bridge arm of each phase; third harmonic voltage is injected into the upper bridge arm and the lower bridge arm of each phase to obtain upper bridge arm voltage and lower bridge arm voltage of a newly-added third voltage component of each phase; and based on the obtained voltage of the upper and lower bridge arms of the newly added three-time voltage component, determining the input number of the sub-modules of the upper and lower bridge arms of each phase by adopting a nearest level approximation modulation strategy, and determining the input sub-module of each bridge arm according to the capacitor voltage sequence of each sub-module of the bridge arms and the current direction. According to the method, on the basis of keeping a discrete control structure, direct injection of third harmonic voltage under an MPC framework is achieved, and higher real-time performance and expandability are achieved.

The invention is applicable to the technical field of voltage converters, and provides a control device and a control method of a direct-current voltage converter and electronic equipment, and the control device is configured to obtain the working state of the direct-current voltage converter, the permission state of a battery and the balance state of a low-voltage side capacitor bank; and when it is detected that the working state of the DC voltage converter is a standby state and the equalization state of the low-voltage side capacitor bank is an unbalanced state, the current flow direction in the charging and discharging module is controlled according to the permission state of the battery so as to perform equalization control on the voltage of each capacitor in the low-voltage side capacitor bank. According to the technical scheme, the low-voltage side capacitor voltage-sharing control is executed in advance when the direct-current voltage converter is in the standby stage, so that the system can directly enter the power control state after receiving the power request, the response time for reaching energy output under a power instruction is remarkably shortened, and quick starting and smooth switching are achieved.

The invention belongs to the technical field of electronic power, and particularly relates to an LCL grid-connected inverter model-free predictive current control system and method based on sampling noise compensation, and the system comprises an inverter main circuit, an LCL filter and a controller. The controller is configured to firstly calculate a current gradient and a voltage gradient according to a collected system operation signal; then, a second-order generalized integrator is used for conducting accurate compensation on sampling noise contained in the gradient; and finally, executing a model-free predictive control algorithm based on the compensated gradient, and preferably selecting an optimal voltage vector through a multi-objective value function integrating inverter side current, capacitor voltage and network side current. According to the method, sampling noise interference is effectively suppressed, the control precision and the anti-interference capability of the system are improved, and stable and efficient operation of the LCL grid-connected inverter can be realized without additional damping.

The utility model provides a phase-locked loop circuit and an image sensor, and the phase-locked loop circuit comprises a phase frequency detector, a charge pump circuit, a switching circuit, an inductance capacitance voltage-controlled oscillator, an automatic frequency control circuit, and a detection control circuit. The automatic frequency control circuit controls the switching circuit to output a voltage reference signal and output a digital code signal, so that the capacitance in the inductance-capacitance voltage-controlled oscillator is changed, the frequency of an output signal of the phase-locked loop circuit is further changed, after calibration is finished, the phase frequency detector and the charge pump circuit output a changed first voltage signal, and the charge pump circuit outputs a second voltage signal. The capacitance of the inductance capacitance voltage-controlled oscillator and the frequency of an output signal of the phase-locked loop circuit are changed, and the detection control circuit outputs a closing signal to close the automatic frequency control circuit, so that additional circuit power consumption is reduced; digital code signals input by the inductance-capacitance voltage-controlled oscillator are not changed, and disturbance influence is eliminated.

The invention belongs to the technical field of direct-current power transmission of a power system, and provides a large-scale new energy cluster black-start steady-state control method and system, and the method comprises the steps: unlocking a receiving-end MMC when the capacitor voltage of a half-bridge sub-module is consistent with the capacitor voltage of a full-bridge sub-module, and unlocking a sending-end MMC after the charging of all sub-module capacitors is completed, the DC voltage of the sending end MMC is adjusted based on the cooperative control of the new energy unit and the sending end MMC, when the DC voltage is adjusted to 0, the DC voltage is adjusted to 1.05 p.u. Based on the receiving end hybrid MMC, the diode uncontrolled rectification is successfully input, the DC voltage is adjusted to a rated value from 1.05 p.u. Based on the receiving end MMC, the power of the new energy station is increased, and the power of the new energy station is increased. And black start is completed until the large-scale new energy cluster sending-out topology recovers normal operation, the sending-end hybrid MMC operates at constant zero direct-current voltage by adjusting the alternating-current voltage amplitude of the new energy station, and black start steady-state control is completed.

The invention discloses a network construction type SVG (static var generator) control method based on data-driven optimal self-synchronization. Obtaining the capacitor voltage of the direct current side of the SVG and the actual voltage and the actual current of the grid-connected point; constructing a DeePC controller input according to the actual voltage of the grid-connected point, the SVG direct current side capacitor voltage and a preset reference value, and obtaining a frequency deviation through the processing of the DeePC controller; adding the frequency deviation and a power grid rated frequency to obtain a controller frequency, and integrating to obtain a modulation wave phase signal; according to the SVG output voltage reference value, the actual voltage is sequentially processed by a voltage outer loop, current amplitude limiting and current inner loop to obtain a modulation wave voltage amplitude signal; and processing the modulated wave phase signal to obtain a modulated wave signal. According to the method, the control sequence is optimized online by directly utilizing the voltage data collected in real time, the mismatching risk of a traditional model is avoided, and a reactive power support solution with better dynamic response and autonomous toughness is provided for a new energy power grid.

Disclosed in the present invention are an FPGA-based simulation method for a high-voltage direct-connected energy storage system, and an apparatus. A power unit of the high-voltage direct-connected energy storage system is divided into an H-bridge and an energy storage unit part, the H-bridge and a grid-side topology are placed in an FPGA for simulation, an energy storage battery branch part is placed in a CPU for simulation, and the FPGA and the CPU exchange submodule voltage and current information by means of a PCIE bus. The FPGA establishes a Thevenin model of a single high-voltage direct-connected energy storage system submodule, performs algebraic superposition by using the series relationship of submodules, and calculates a submodule capacitor voltage, a submodule terminal voltage, and a bridge arm voltage; an equivalent model and the grid-side topology run with a simulation step size of 1µs in an FPGA of a simulator; the energy storage battery branch runs in a CPU of the simulator, and the CPU supports a user-defined energy storage battery model; and the respective advantages of a real-time multi-core processor and an FPGA are fully combined, so that the high-voltage direct-connected energy storage system with any number of submodules can be precisely simulated with a simulation step size of 1µs in real time on the FPGA.

The invention discloses a flexible DC power transmission system grid following-grid construction hybrid control method, and the method comprises the following steps: obtaining the voltage and current of a receiving end MMC grid connection point, and carrying out the dq decomposition, thereby obtaining a d-axis component and a q-axis component under a dq rotating coordinate system; acquiring actual values and related reference values of direct-current voltage output by the receiving-end MMC, alternating-current voltage and frequency of a grid-connected point of the receiving-end MMC and average capacitance voltage of a sub-module; sequentially calculating a phase reference value of the receiving end MMC, a d-axis current reference value and a q-axis current reference value of the grid connection point, a d-axis voltage reference value and a q-axis voltage reference value of the differential mode voltage, a direct current reference value and a direct current modulation ratio reference value; and calculating the reference value of the modulation voltage of the receiving end MMC under the abc static coordinate system. The control method has the advantages of adapting to wide-range short-circuit ratio change of the receiving-end power grid, guaranteeing reliable transmission of power under the condition of wind speed change, and still maintaining synchronous operation when the receiving-end alternating-current power grid seriously breaks down.

The invention relates to the technical field of electromagnetic transient simulation, in particular to an electromagnetic transient simulation decoupling method, system and device based on a single-impedance branch and a medium, and the method comprises the steps: dividing a system to be simulated into two subsystems which are connected through the single-impedance branch, and carrying out the equivalent reconstruction to form a reconstructed branch model; establishing a discrete state space equation based on the reconstructed branch model; according to the main step length, the number of sub-steps meeting the stability condition is determined based on a small-step synthesis algorithm, and the main step length is equally divided into differential step lengths; in each main step length interval, performing iterative calculation on the state-space equation by using a differential step length to obtain a branch current and a capacitor voltage at the next moment; and injecting the calculated branch current serving as a known current source into an original network equation, solving in parallel to obtain the port voltage of the subsystem, and completing decoupling calculation and promoting simulation. According to the method, effective decoupling of the universal single-impedance branch can be realized, and the applicability, the numerical stability and the calculation efficiency of parallel simulation are improved.

The invention belongs to the technical field of power distribution network high-voltage electrical equipment monitoring, and particularly relates to a ring main unit full-shielding capacitance partial pressure sensing device, a preparation method and a monitoring system. The device comprises high-voltage capacitor sampling units which are connected in series, a high-voltage side shielding structure which wraps the high-voltage capacitor sampling units and is equipotential with a high-voltage end, a low-voltage signal processing module used for processing small-voltage signals, and a low-voltage side shielding structure which is grounded and wrapped. Through the double-layer full-shielding design, an external electric field can be effectively uniformized, partial discharge is suppressed, electromagnetic interference is isolated, and the measurement stability and precision of the ring main unit in a strong electromagnetic environment are remarkably improved. The device is generally of a plug type integrated structure matched with a ring main unit interface, internal capacitors are precisely welded, and the total capacity is controlled within a specific range. And the low-voltage module can condition and analyze voltage division signals, so that collaborative sensing and uploading of multiple parameters such as voltage, frequency, harmonic waves and the like are realized, and key technical equipment is provided for intelligent monitoring of the state of the power distribution network.

A hybrid switching converter with a single inductor and multiple outputs is disclosed for converting an input voltage to a first output voltage and a second output voltage. The hybrid switching converter includes a sub-switching converter configured to convert the input voltage to an intermediate voltage, and first and second output switches configured to respectively convert the intermediate voltage to the first and second output voltages. An inductor has one terminal coupled to a switched-capacitor voltage dividing circuit and another terminal coupled to a second voltage. Under different configurations, the inductor is coupled to either a negative terminal or a positive terminal of a first capacitor, thereby converting the first voltage to either half the first voltage and a reference potential, or the first voltage and half the first voltage. The first voltage and the second voltage respectively correspond to one of the input voltage and the intermediate voltage.

The invention discloses a virtual impedance control method based on a double-resonance controller, which is characterized in that a nonlinear load is connected to a power grid at a point of common coupling (PCC), a converter side and a power grid side are respectively provided with a converter side inductor () and a power grid side inductor (), and a branch is led out from the middle point of the converter side inductor () and the power grid side inductor () and is provided with a capacitor (C); the converter side current is fed back and compared with the fundamental wave current reference to form closed-loop control; the closed-loop control includes a proportional resonant controller that adjusts at a harmonic frequency of interest; and when the system does not need the virtual impedance, the branch where the resonance controller is located is cancelled. When the system needs virtual impedance, the capacitor voltage is fed forward through the resonance controller. The resonance controller is connected in series with the feedback branch of the capacitor voltage, so that the high-frequency influence of the branch on the system is eliminated, namely, the stability of the system is not influenced by the branch, and the system can be used for simulating any complex virtual impedance and ensuring the stability of the system at the same time.

In an aspect of the disclosure, an operation method, for balancing voltage of capacitors of a bridge circuit of a multi-level LLC resonant converter, includes: measuring voltages of the capacitors of the bridge circuit, an output voltage and an output current of an output load the multi-level LLC resonant converter, and an input voltage of the bridge circuit; selecting a voltage-level zone of a required output voltage of the bridge circuit according to the output voltage of the output load, and the input voltage of the bridge circuit; selecting a circuit mode, with a highest value of the required output voltage; and outputting PWM signals corresponding to the circuit mode, with a switching frequency, to switches of the plurality of capacitor-switch modules.

A vehicle power supply system includes a relay on a battery-side power line relative to a smoothing capacitor, a driver for the relay, first and second control units, and a cut-off line. The second control unit outputs a drive signal to the driver in response to a command from the first control unit, while the first control unit can directly cut off the relay through the cut-off line in preference to the drive signal from the second control unit. When terminating the system, the first control unit outputs a relay cut-off command to the second control unit, diagnoses relay welding based on whether the smoothing capacitor voltage decreases, then sets the cut-off line to a cut-off state, outputs a relay connection command to the second control unit, and diagnoses whether the cut-off line is effective by monitoring the driver’s output state.

The utility model discloses a silicon carbide drive circuit with miller clamping function relates to semiconductor drive circuit technical field, the utility model discloses a power module, drive module, control module and power module, power module is used for converting external 24V power supply into 5V voltage and isolated 15V voltage, and the power supply is powered for drive chip input end and output drive end, drive module is used for the differential signal processing amplification MCU sends to the drive voltage of SIC MOS, the utility model discloses circuit can when the current passes through miller capacitor voltage not through drive resistance directly connects ground, makes the current quick release to the voltage reduction below Vth prevents the false opening, in addition, this circuit can also detect the overcurrent condition of SIC MOS, when the current exceeds the set value, closes drive output, and simultaneously possesses chip and drive voltage detection function, when voltage is unstable, sends signal to MCU and closes drive output.

The present application belongs to the technical field of modular multilevel converter, and particularly relates to a kind of MMC half-bridge sub-module inter-thermal balance control method.The present application takes voltage balance principle and junction temperature balance principle as core, by predicting the junction temperature trend of half-bridge sub-module switching device in next control cycle, the junction temperature of half-bridge sub-module switching device and capacitor voltage are combined to set weight factor C for half-bridge sub-module switching control, which can realize the junction temperature balance of switching device between different half-bridge sub-modules in the same bridge arm.By taking half-bridge sub-module as the research object, and considering the temperature of the four switching tubes in its topology, the thermal balance control of MMC under different operating modes can be realized.By embedding the junction temperature control variable into the voltage balance algorithm and ensuring the stable operation of the MMC system, the junction temperature balance effect of the switching devices between the half-bridge sub-modules can be effectively improved, which can effectively reduce the pressure of uneven thermal stress distribution between the half-bridge sub-modules and improve the operation reliability of the MMC system.

The utility model relates to the technical field of industrial semiconductors, and discloses a device for detecting the working state of a lamp holder of ultraviolet light curing equipment, which integrates temperature, wind pressure and ultraviolet light intensity detection functions by optimizing the structure of a hardware circuit. The circuit comprises a switch type capacitor voltage converter, a linear voltage regulator, a phototriode, an NTC thermistor, a partial pressure sensor and a CAN communication module. Through the bidirectional TVS diode, RC filtering and two-stage voltage stabilization design, the anti-electromagnetic interference capability is improved, and the signal transmission reliability is improved; temperature, wind pressure and illumination detection circuits are integrated on a single board, the structure is simplified, and the space is saved; the standby energy consumption of the sensor is reduced through hardware power management; by comprehensively optimizing the circuit structure and the signal transmission path, the detection reliability of the working state of the lamp holder of the ultraviolet curing equipment is improved.

The invention relates to a solar charging circuit, a method, a power supply device and equipment, and the solar charging circuit carries out the boosting of a solar electric signal outputted by a solar panel through a boosting charging module under the control of a solar charging enabling end, and outputs a boosting charging signal to an electrochemical capacitor module. The electrochemical capacitor module charges an electrochemical container in the electrochemical capacitor module according to the boost charging signal so as to realize low-temperature charging, and the linear charging module charges the electrochemical container in the electrochemical capacitor module according to the battery temperature corresponding to the lithium battery under the control of the capacitor charging enable signal end. A battery charging signal is output to a lithium battery module based on a capacitor voltage signal provided by an electrochemical hybrid capacitor, so that the lithium battery module charges a lithium battery according to the battery charging signal, the lithium battery is charged by using the electric quantity stored by the electrochemical hybrid capacitor, and the energy of solar energy can be further utilized to a greater extent; and the endurance time of the battery is prolonged.

The invention discloses a parallel port type hexagonal frequency mixing solid-state transformer and a regulation and control method and device thereof, and the method comprises the steps: under the conditions that the direct-current active power and the alternating-current active power of the solid-state transformer are equal, and the instantaneous active power absorbed by each sub-bridge arm is 0, calculating the frequency of each sub-bridge arm in each sub-bridge arm; the stability relation between the fundamental frequency alternating current port current distribution coefficient and the intermediate frequency alternating current port current distribution coefficient is determined; and calculating a bridge arm circulation current through the stability relationship, thereby calculating to obtain a bridge arm circulation voltage reference value, calculating to obtain a sub-module capacitor voltage reference value of each sub-bridge arm, superposing each sub-module capacitor voltage correction component of each sub-bridge arm, obtaining a corresponding optimized sub-module capacitor voltage, and generating a corresponding modulation signal. By the adoption of the technical scheme, the multi-scene access requirement of the alternating current and direct current hybrid power distribution network is met, and inherent decoupling of three-frequency components including direct current, fundamental frequency and intermediate frequency can be achieved without an additional frequency selection network under the corresponding control method.

The invention discloses a two-wheeled vehicle energy recovery system and method. The system comprises an environment sensing module (a GPS, an air pressure sensor, a gyroscope, a terrain processor and a Kalman filtering prediction gradient), a signal acquisition module (a brake force sensor, a wheel speed sensor, a load sensor, a temperature sensor and a double-SOC sensor), and a super capacitor module (an energy storage area is made of a high-energy density material; the energy discharge region is made of a high-power-density material; the execution output module comprises a hub motor, a rectifier, a double-LLC converter, a relay, a clutch, a PTC and a liquid cooling system. The method comprises the steps that 1, dynamic energy recovery is conducted, specifically, the total required braking force is calculated during braking, regeneration or friction braking is selected according to the SOC of an energy storage area, and the regenerative braking force is limited by motor characteristics and capacitor voltage; 2, intelligent energy transfer: an energy storage area SOCgt; and when the temperature is 80%, the transfer amount is calculated according to the state, and is transferred within the temperature control range of-20 DEG C to 65 DEG C through SOC correction in an energy discharge region. According to the invention, the recovery efficiency and the service life of the system are optimized through capacitor partitioning and multi-mode control.

The invention discloses a discharging control method, a power module and a charging system, and relates to the technical field of charging, the discharging control method is applied to the power module, the power module comprises a DC / DC conversion circuit, the DC / DC conversion circuit comprises at least one group of resonant power conversion loops, each resonant power conversion loop comprises a first power conversion module and a second power conversion module, the method is performed by a controller, the controller comprising a regulation loop, the method comprising: in the event of a power module shutdown, determining a first phase and a second phase based on a discharge demand; and under the condition that the first power conversion module discharges according to the first phase and the second power conversion module discharges according to the second phase, the first phase and the second phase are adjusted based on the electrical parameters and the adjusting loop, so that the DC / DC conversion circuit discharges normally. Therefore, self-discharge without an external discharge circuit can be realized, the cost and the size are saved, and the capacitor voltage is released through the loss of energy circulation in the circuit.

The application relates to a flexible direct-current receiving-end alternating-current fault ride-through method, a system, a computer device, a storage medium and a computer program product. The method comprises the following steps: when a receiving-end alternating-current fault signal of a receiving-end alternating-current system is received, a sending-end converter is controlled to be switched to a capacitor voltage average value control mode; a capacitor voltage average value of the sending-end converter and a capacitor voltage reference value of the sending-end converter are acquired; a target sending-end direct-current voltage reference value of the sending-end converter is determined according to the capacitor voltage average value and the capacitor voltage reference value; the sending-out power of the direct-current side of the sending-end converter is controlled according to the target sending-end direct-current voltage reference value until the capacitor voltage of the sending-end converter is in a stable state, and the capacitor voltage average value control mode is exited. The method can solve the capacitor voltage fluctuation problem of the sending-end converter after the sending-end converter is input into a direct-current energy consumption device, and improves the stability of the sending-end alternating-current system.

The invention discloses an open winding motor power decoupling control device and method based on a Z-source inverter, and relates to the technical field of motor control. The control device is controlled by a power supply hybrid open winding motor; the method comprises three core links: 1, direct-current chain voltage closed-loop control with a reference value updating link, wherein the amplitude of a direct-current chain can be dynamically stabilized only by sampling capacitor voltage; according to the Z-source inverter modulation strategy, specific switch switching points are calculated for different sectors, and harmonic interference introduced by straight-through vectors is restrained; and 3, separating active and reactive voltage components based on a power decoupling algorithm of vector coordinate operation to realize power distribution. According to the invention, the complexity of a control algorithm is simplified, the feedback input quantity is reduced, and the anti-interference capability and the operation stability of the system are improved.

The invention discloses a monitoring circuit of a turning thyristor and a monitoring method thereof, and belongs to the technical field of power device control. The monitoring circuit of the turning thyristor is provided with a first driving unit, a second driving unit, a voltage detection unit, a control unit, a first leakage current detection unit and / or a second leakage current detection unit; and detecting the capacitor voltage of the direct current capacitor in real time, identifying a first breakdown result of the first leakage current detection unit and / or a second breakdown result of the second leakage current detection unit, and judging whether the turning thyristor is abnormal breakdown or not by combining the capacitor voltage, the first breakdown result and / or the second breakdown result. Therefore, on-line monitoring of the working state of the turning thyristor is realized, a certain reference significance is provided for analysis of failure reasons of the turning thyristor and improvement of the operation reliability of the modular multilevel converter in high altitude and other scenes, the protection action of the power module is further triggered, the fault range is prevented from being expanded, and reliable operation of direct current transmission is guaranteed.

The invention provides a self-powered wireless sensor node energy efficiency control method and system for an indoor weak light scene, and belongs to the technical field of self-powered wireless sensors of the Internet of Things. Comprising the following steps: constructing an energy collection and energy perception calculation model which comprises an energy collection module, an energy perception calculation module, an energy prediction module and an energy management module; the energy sensing calculation module dynamically adjusts the capacitor capacity by using a temperature correction model in the process of calculating available energy according to the super-capacitor voltage; the energy prediction module performs prediction by adopting a mixed entropy weight rolling adaptive energy prediction algorithm based on low energy density and high-frequency fluctuation characteristics of an indoor weak light scene, and dynamically adjusts a prediction weight according to an energy fluctuation condition by distinguishing situations, controlling dormancy and quantifying energy fluctuation. Balancing the indoor energy prediction precision and the energy consumption in the energy collection process; and the energy management module performs energy efficiency control based on the model, calculates an energy prediction value of the next time slot and performs working mode control of the node.

The invention discloses an unloading control method and system for a hybrid direct current load device, and belongs to the field of power system control. The method is suitable for an energy consumption valve controller of the hybrid direct current load device, the device further comprises an energy consumption valve module connected with the controller, and the energy consumption valve module comprises a plurality of connected submodules. When a power grid breaks down, the energy consumption valve module is controlled to be switched to an input state according to an energy consumption valve switching signal on the power grid side; the input priority is determined according to the arrangement sequence of the current average capacitor voltage of the sub-modules in a preset control period, the sub-modules are controlled to be switched to an input mode, and at the moment, thyristors of the sub-modules are in a conducting state; when the power grid is recovered to be in a non-fault state, the energy consumption valve module is controlled to be switched to a cut-off state according to the energy consumption valve cut-off signal, and the sub-modules are controlled to be switched to a cut-off mode according to the current average capacitor voltage arrangement sequence; and after all the sub-modules are switched to the cut-off mode, the energy consumption valve module is controlled to be switched to the locked state. The problems that in the prior art, the control cost is high, and the efficiency is low can be solved.

The invention discloses a high-sensitivity passive sensing terminal design method, and belongs to the technical field of passive sensing of the Internet of Things. The method is used for solving the problems of unstable energy collection, insufficient energy storage and easy task interruption of the passive terminal under the condition of ultralow input power. The method comprises an energy acquisition unit, an energy management and storage unit composed of a long-term energy storage capacitor and a short-term energy storage capacitor, and a sensing terminal unit. The system charges the two capacitors at the same time in the dormancy stage; the system is awakened in a preset time through a low-power-consumption timing mechanism, the capacitor voltage is detected, and main power supply is switched on only when the two reach a power-on threshold value, so that the terminal executes a sensing and communication task once. In the task process, when the voltage of any capacitor is reduced to a power-off threshold value, the system immediately closes main power supply and enters the energy storage stage again. Efficient energy collection and reliable energy storage are achieved through a double-capacitor structure and a double-threshold mechanism, tasks can be stably completed under limited energy, and the low-power-consumption wireless sensing device is suitable for low-power-consumption wireless sensing application.

The utility model discloses a capacitor voltage aging performance index test fixture, which comprises a four-claw finger cylinder, a probe mounting plate, an elastic telescopic probe and a limit plate, the four-claw finger cylinder is fixedly connected onto a workbench, the upper end face of each finger of the four-claw finger cylinder is fixedly connected onto a bottom plate of the probe mounting plate, and the probe mounting plate is fixedly connected onto the bottom plate of the probe mounting plate. Elastic telescopic probes are fixedly connected to a vertical plate of the probe mounting plate, the four elastic telescopic probes can make contact with the four side pin end faces of the three-terminal capacitor, the limiting plate is fixedly connected to the workbench through a stand column, and a limiting groove for containing the three-terminal capacitor is formed in the middle of the upper end face of the limiting plate. The four sides of the limiting groove are symmetrically provided with guide grooves for the elastic telescopic probes to pass through, the limiting plate right opposite to the probe mounting plate is provided with an avoiding hole, and the four elastic telescopic probes are connected to a capacitor aging performance index tester of the three-terminal capacitor. According to the utility model, the elastic telescopic probe is contacted with the electrode of the three-terminal capacitor from four sides, so that the contact reliability of the probe and the capacitor can be visually checked.