78 results about "Current constant" patented technology

The embodiment of the invention discloses a pump laser aging test system and electronic equipment. The aging test system comprises a light path monitoring system, a liquid cooling heat dissipation system, an electrical control system, a test system and a cabinet body, the optical path monitoring system is used for monitoring a monitoring index of the pump laser in real time to obtain monitoring index data; the test system is used for monitoring the monitoring index data and controlling the electrical control system according to a monitoring result; the electrical control system supplies power to the pump laser through the constant-current and constant-voltage direct-current power supply and performs on-off control on the constant-current and constant-voltage direct-current power supply according to a control instruction sent by the upper computer; and the liquid cooling heat dissipation system is used for performing temperature control on the aging process of the pump laser. The optical path monitoring system monitors multi-dimensional monitoring indexes such as the optical power and the spectrum of the pump laser in real time, it is guaranteed that the aging state of the pump laser is accurately evaluated, various parameters such as the temperature, the current and the voltage of a pump cover plate are covered, and different test requirements can be met.

The application discloses a constant-current constant-voltage converter integrated with a clamping and auxiliary power supply and a starting method thereof, and belongs to the field of power conversion, comprising a main converter and a regenerative clamping circuit; the main converter comprises an inverse resistance H-bridge, a main inductor, a main transformer, an inverse direction H-bridge and a main capacitor; the regenerative clamping circuit comprises a diode clamping circuit, a clamping capacitor and a feedback circuit. The inverse resistance H-bridge of the main converter has at least two bridge arms which are respectively formed by series connection of inverse direction switching devices and diodes, and the series connection points are respectively connected with the anode and cathode of two diodes of the diode clamping circuit; the other two bridge arm connection points of the inverse resistance H-bridge of the main converter are connected with the midpoint of the diode half-bridge of the clamping circuit, so that the passage of the clamping current and the charging current of the current source is provided. The circuit structure provided by the application can not only effectively inhibit the voltage peak of the inverse resistance bridge arm, but also provide an auxiliary power supply for the driving circuit of the inverse resistance bridge arm.

The application provides a method for evaluating internal resistance performance of a lithium ion battery. The method comprises the following steps: S1: performing a charge-discharge cycle test on the lithium ion battery to be tested, the charging process is constant-current constant-voltage charging, and the discharging process is constant-current discharging; and S2: evaluating the internal resistance performance of the lithium ion battery to be tested by taking the growth rate of the constant-voltage charging capacity ratio in the xth cycle as B x (B x =(A x -A1) / A1*100%, A x =C 2x / C 1x *100%). The application takes the change rate of the constant-voltage charging capacity ratio in the charging process of the lithium ion battery as the internal resistance growth rate of the material, can continuously monitor the internal resistance change in the cycle process of the battery, and can accurately judge the internal resistance growth rate of different materials. The method is simple and convenient. That is, the method provided by the application has the advantages of short period, low cost, simplicity and convenience, and is suitable for evaluating and screening multiple materials in the material research and development stage.

This disclosure relates to a charging method, apparatus, electronic device, and medium. The charging method includes: determining a target charging current for the battery; when the target charging current is greater than or equal to a first target current, simultaneously charging the battery using a first charging circuit and a second charging circuit; when the target charging current and the total output current are not the same, adjusting the first output current of the first charging circuit while keeping the second output current of the second charging circuit constant, wherein the total output current is the sum of the first and second output currents. By adjusting the total output current in a manner that adjusts the first output current while keeping the second output current constant, the adjustment of the first output current can prevent an imbalance in the electrical parameters of the second charging circuit from triggering charging protection, thereby improving the reliability of battery charging.

The application relates to the technical field of power management, and discloses a configurable constant-current constant-voltage power supply system. The system comprises a voltage stabilizing unit, a current sampling unit, a voltage sampling unit, an analog-digital conversion unit and a processing unit. The current sampling unit converts output current into a voltage signal through a first resistor; the voltage sampling unit converts output voltage into a collectable voltage signal through a second resistor and a third resistor; the analog-digital conversion unit adopts two analog-digital converters to collect voltage signals of the first resistor and the third resistor respectively; the processing unit compares a constant-current value or a constant-voltage value set by a user and generates a control signal through a processing algorithm, and the output voltage of the voltage stabilizing unit is adjusted through a digital-analog converter. The application adopts a digital control scheme, a user can flexibly configure a working mode through software, has the advantages of high control precision, flexible parameter configuration and good stability, and is suitable for various application occasions requiring accurate current or voltage control.

The application discloses a battery test system and a test method, wherein the system comprises an alternating-current constant-current excitation source, a master control unit and a plurality of independently arranged acquisition board cards; the alternating-current constant-current excitation source is connected to the first and last ends of a measured loop formed by a plurality of measured battery cells connected in series, is used for applying the same alternating-current constant-current excitation signal to all the measured battery cells, and simultaneously outputs a synchronous reference signal consistent with the alternating-current constant-current excitation signal to the plurality of independently arranged acquisition board cards; each acquisition board card is connected to only the sensing end of the corresponding measured battery cell, processes the sensing signal between the two ends of the corresponding measured battery cell, so as to obtain measurement data; and each acquisition board card reports the measurement data to the master control unit through a CANFD bus, and the master control unit collects and uploads the measurement data to an upper computer. The application realizes parallel and synchronous alternating-current internal resistance and direct-current open-circuit voltage test of a plurality of single battery cells in a series battery cell group, and improves the consistency and test efficiency of battery test.

The utility model discloses a kind of constant-current constant-voltage switching valves, it is characterized by including by two three-way valve bodies The six-way valve body, import passage and two mirror image settings export passage set on three-way valve body, valve rod movably installed in six-way valve body, connecting rod mechanism in the mirror image settings of valve rod two sides and the cam for driving connecting rod mechanism to act and switching flow path installed on valve rod. The utility model is switched by mirror image settings export passage and the setting of connecting rod mechanism, in the rotation process of being driven by rotating valve rod two to drive cam, the action of connecting rod mechanism is made by the pushing of cam to connecting rod mechanism, to export passage is switched, in switching process, the flow area of medium does not change, so that medium pressure does not produce fluctuation when switching, while medium pressure does not change, medium flow also does not change, to realize constant current constant voltage in switching process.

The utility model discloses a DC-DC (direct current-direct current) constant-voltage constant-current boosting electric vehicle charger. The internal circuit comprises a DC input and detection circuit, an input MOSFET TTP switch circuit, a boost circuit, an output filter circuit, an output battery voltage detection circuit, an LDO step-down circuit, an RX / TX one-wire communication input and output circuit, an OTP over-temperature protection circuit, an MCU control circuit, an output voltage control circuit and an output current control circuit. According to the DC-DC direct-current constant-voltage constant-current boosting electric vehicle charger, the input MOSFET TTP switching circuit, the direct-current boosting circuit, the MCU control circuit, the output voltage control circuit and the output current control circuit are designed, so that a power supply charger can be used on a direct-current charging pile with lower output voltage to quickly charge a high-voltage battery pack with higher voltage; in addition, the charging efficiency is high, the working performance is stable, and the charger is safer.

The application discloses a current fixed value setting method and device and electronic equipment. The method comprises the following steps: determining a set of operation scenarios of a power distribution network, and determining a set of system gears of a flexible interconnected device in the power distribution network; determining the fault current amplitude of a directional overcurrent protection device in the power distribution network under different fault categories according to the set of operation scenarios and the set of system gears; determining the fault current boundary of the directional overcurrent protection device under different fault categories according to the fault current amplitude; and determining the current fixed value corresponding to the directional overcurrent protection device according to the fault current boundary and a preset safety factor. The application solves the technical problem of low reliability of current fixed value setting due to the fact that the directional overcurrent protection setting method in the related art usually determines the fault current boundary based on a single working condition or an experience margin, and does not consider the operation uncertainty of the power distribution network and the flexible interconnected regulation capacity.

The application discloses a constant-current constant-voltage circuit and an electronic load for the electronic load, and relates to the technical field of electronic loads. The constant-current constant-voltage circuit comprises an MCU, a DAC module, a first error amplifier, a plurality of constant-current loops, a power supply end and a first differential amplifier, the plurality of constant-current loops are connected in parallel, the voltage or the current of the plurality of parallel constant-current loops is controlled through the DAC module and the first error amplifier, and the originally parallel circuit of a plurality of small closed loops is changed into the architecture of controlling small closed loops by a large closed loop. The plurality of constant-current loops are connected to the ground through a sampling resistor, the precision and the noise will not be affected by the measured power supply and overcurrent, and the sampling precision is high. The constant-current constant-voltage circuit has strong scalability, the number of the parallel constant-current loops can be infinitely stacked in theory, and is particularly suitable for the case of high voltage and small current.

The invention provides a battery constant-current and constant-voltage control system based on an analog digital loop. The battery constant-current and constant-voltage control system comprises a sampling circuit, a floating charge control system, a driving circuit and an analog loop. The sampling circuit collects an output signal of the driving circuit and feeds back a sampling signal to the floating charge control system; the floating charge control system outputs a voltage given signal and a current given signal to the analog loop, and adjusts the voltage given signal and the current given signal according to the sampling signal; the simulation loop generates a loop control signal according to the voltage given signal and the current given signal; the driving circuit drives the power converter according to the loop control signal and based on the signal, so that the power converter outputs the charging voltage and the charging current corresponding to the current given value and the voltage given value. Therefore, the problem of large current ripples caused by the combined action of a double closed-loop control voltage loop and a double closed-loop control current loop is solved; meanwhile, a mode of combining software adjustment and a simulation loop is adopted, and the problem that a traditional software control mode is insufficient in dynamic state is solved.

The invention relates to the technical field of high-power wireless charging systems, in particular to a wireless charging system based on modular parallel connection, which comprises a data acquisition module, a control processing module, a power regulation module and an output management module, the data acquisition module acquires battery parameters of load equipment and transmits the battery parameters to the control processing module; the control processing module inquires a voltage and frequency mapping relation to generate a control signal comprising a switching frequency and a module activation instruction; the power regulation module comprises a plurality of parallel single-tube inversion units, receives a control signal to regulate the on-off state of each unit, and reduces the voltage stress of a single tube through a resonance network; and the output management module switches the compensation capacitor mode according to the control signal to reconstruct the output voltage. The system disperses the power load through a modular parallel structure, completes zero-voltage switching and constant-current and constant-voltage charging in combination with intelligent control, and improves the power expansion capability and the equipment interoperability.

This invention proposes a wireless charging system and parameter design method with zero-phase-angle constant current and constant voltage output characteristics. The wireless charging system specifically includes a DC voltage source U. DC Inverter bridge, primary-side compensation network, transmitting coil L p2 Receiver coil L' s1 Secondary-side compensation network, rectifier bridge, and load resistor R; the DC voltage source U DC The inverter bridge is connected to the primary-side compensation network and the transmitting coil L. p2 Connected, the transmitting coil L p2 With receiving coil L' s1 Mutual inductance, the receiving coil L' s1 The system is connected to a secondary compensation network and a rectifier bridge, with the rectifier bridge connected to the load resistor R. This invention achieves constant current / constant voltage operating mode switching only through two fixed operating frequencies under varying coupling coefficients, with both operating modes satisfying zero phase angle. Furthermore, the compensation topology suppresses higher harmonics in the rectifier unit, making the system's output current and voltage values ​​more stable.

The utility model discloses a photovoltaic power generation equipment fault arc detection device comprising a current detection instrument, the current detection instrument is connected in series with a detection current adding device and a current regulator, two ends of the current detection instrument after series connection are respectively connected to corresponding output ends of a photovoltaic string to be detected to form a photovoltaic string anti-current detection loop, and the detection current adding device comprises a DC power supply. A constant-current constant-voltage module connected with the direct-current power supply is further arranged in the detection current adding device, and the two ends of the current detection instrument connected with the current regulator in series are also connected to the corresponding output ends of the photovoltaic string to be detected respectively to form a photovoltaic string short-circuit current detection loop. And the photovoltaic group string short-circuit current detection loop and the photovoltaic group string anti-current detection loop are detected and switched through a change-over switch. The photovoltaic power generation equipment fault arc detection device can rapidly and conveniently detect a photovoltaic string which may have a DC fault arc, and improves the safety performance of the photovoltaic power generation equipment.

An LED high-voltage direct-current drive circuit, a chip and an LED lighting circuit belong to the technical field of energy-saving lighting control, solve the problem of how to improve the lighting efficiency of LED lighting, and comprise a power taking circuit, a reference voltage circuit, a voltage constant circuit, a comparison amplification circuit, a current constant circuit, a control output circuit and a soft start circuit which are connected with one another. When the external high-voltage direct-current power supply voltage is higher than the rated voltage and lower than the protection voltage and the external high-voltage direct-current power supply voltage is lower than the rated voltage, the voltage constant circuit controls the working state of the external MOS tube, so that the LED lighting module works in a constant-voltage or constant-power state; the current constant circuit controls the working state of the external MOS tube by collecting the current of the LED lighting module, so that the LED lighting module works in a constant current state; and high-reliability and high-luminous-efficiency LED illumination is realized under the condition of high-voltage direct-current power supply.

The invention provides a wireless charging constant-current and constant-voltage closed-loop control method and system based on PID control, is applied to a magnetic coupling wireless charging system comprising an LCC-S compensation network, and relates to the technical field of wireless charging. Input voltage is adjusted through the primary side Buck converter, proportional-integral-differential adjustment is executed in combination with receiving side current, voltage real-time feedback and charging stage judgment, feed-forward compensation is superposed, the duty ratio is dynamically adjusted, constant-current and constant-voltage control precision and response speed are improved, and high efficiency, stability and robustness enhancement in the charging process are achieved.

The application provides a constant current control circuit suitable for power supply parallel connection, solves the problem that the output current constant current value of a traditional redundant backup power supply system is far more than the rated demand current value of a load, thereby endangering system safety, and realizes that the output constant current total current of the redundant backup power supply system is the system constant current limiting value, rather than the sum of the constant current values of each power supply. When one power supply fails to exit the parallel connection state, the constant current point of the power supply still in the working state is automatically changed, the load current demand is ensured, and the reliability of the system is improved.

The invention discloses a head-mounted LED operating shadowless lamp circuit and a head-mounted LED operating shadowless lamp, and belongs to the technical field of medical instruments. The circuit comprises an LED direct current driving chip, a voltage sampling resistor, a current sampling resistor, a soft start capacitor, an external MOS tube and LED lamp beads connected in parallel. A soft start circuit, a power taking circuit, a reference voltage circuit, a voltage constant circuit, a comparison amplification circuit, a current constant circuit and a control output circuit are arranged in the LED direct-current driving chip, constant-voltage, constant-power or constant-current driving can be achieved, PWM dimming is not needed, and therefore the stroboflash phenomenon is thoroughly eliminated, and lighting uniformity and visual comfort are improved. The device is simple in structure, high in integration level, good in reliability and suitable for fine operation occasions such as surgical operations.

The invention discloses a constant-current and constant-voltage wireless charging hybrid control system and method, and relates to the technical field of wireless charging. The system comprises an adjustable power supply device, a wireless charging transmitting device and a wireless charging receiving device. The adjustable power supply device comprises a voltage regulating plate, and the output end of the voltage regulating plate is connected with a programmable power supply. According to the system, the input voltage is controlled through the front-stage voltage regulating plate to perform wide-range coarse adjustment, and rapid fine adjustment is performed in combination with the rear-stage phase shift control, so that a hybrid control strategy is formed. In the constant-current or constant-voltage charging process, the phase shift angle is always maintained in a preset efficient working window by monitoring and controlling the phase shift angle in real time. When the phase shift angle deviates from the window, the pre-stage input voltage is automatically adjusted and pulled back, so that the system can work in a soft switching state and a high-efficiency interval in a full-load range; the technical problem that high efficiency and high stability of constant-current and constant-voltage output are difficult to consider at the same time due to large-range change of equivalent impedance in the battery charging process is effectively solved.

The invention relates to the technical field of battery control, and discloses a zinc-series water battery constant-current constant-voltage cooperative control system and method, and the method comprises the steps: collecting battery data in real time through a multi-source sensing module; constructing and solving a zinc ion diffusion equation and an interface electrochemical reaction equation by utilizing an embedding-de-embedding dynamic modeling module; the adaptive switching decision module dynamically calculates an optimal voltage threshold value; the cooperative control execution module controls the charging current and voltage according to the threshold value; and the data driving compensation module corrects model parameters on line and performs feedforward compensation on an instruction. The system comprises a multi-source sensing module, an embedding-de-embedding dynamic modeling module, a self-adaptive switching decision module, a cooperative control execution module and a data driving compensation module. According to the technical scheme, the charging capacity error can be controlled within + / -2%, the switching opportunity deviation is smaller than 5 seconds, the control precision and efficiency of the charging process are remarkably improved, and zinc dendritic crystal growth is effectively inhibited.

The present application relates to the technical field of electric machines, and relates to an online efficiency optimization method for a permanent magnet synchronous motor. For each preset fixed control period of a motor controller of a target vehicle, a motor battery state parameter in the fixed control period is acquired. The motor battery state parameter is preprocessed. The preprocessed motor battery state parameter is input into an input layer of a current prediction model, and then sequentially passes through a first hidden layer, a second hidden layer and an output layer to obtain a predicted current instruction. According to the predicted current instruction and a preset current constant, current values of d-axis and q-axis are determined, so as to control the motor controller according to the current values of d-axis and q-axis. Through the trained current prediction model, the best current distribution instruction can be quickly given under any combination of speed, torque, battery state and temperature, and the motor efficiency is significantly improved.

The application discloses a lead storage battery charging formation method and relates to the field of lead storage battery charging formation. The method comprises the following steps: (1) large-current intermittent pulse charging; (2) multi-stage variable-current constant-current charging; (3) lead storage battery constant-current discharging; (4) large-current constant-current charging; (5) high-frequency positive and negative pulse charging; (6) multiple circulation of steps (3)-(5); (7) trickle charging the battery to voltage stability and then carrying out acid extraction to complete the battery formation. The charging process disclosed by the application can reduce the battery electrolyte temperature in the formation process, improve the electrical performance of the storage battery, improve the consistency of the storage battery and improve the matching stability of the battery. Further, the premature capacity decline caused by the inconsistency of the battery in the use process of the storage battery is reduced, and the return rate of the lead-acid storage battery is reduced.

The invention discloses a back-to-back flexible direct current converter station valve area fault identification method and system, and is applied to the technical field of fault identification, and the method comprises the steps: obtaining a first interphase loop and a second interphase loop based on the Kirchhoff's law; acquiring real-time data of a target back-to-back flexible direct current converter station valve area, obtaining voltage data corresponding to a first interphase loop and voltage data corresponding to a second interphase loop, and determining a first current rise rate and a second current rise rate; determining a target current rise rate based on the first current rise rate and the second current rise rate; processing the target current rise rate, the maximum steady-state active power and a preset temporary latching current constant value to obtain a fault identification factor; and performing fault identification on the target back-to-back flexible direct current converter station valve region based on the target current rise rate and the fault identification factor. According to the method provided by the embodiment of the invention, the technical problem of response delay of a current amplitude detection mechanism can be solved, and the fault detection efficiency is improved.

The utility model relates to the technical field of dimming power supplies, and particularly discloses a module-combinable constant-current constant-voltage dimming all-in-one machine, which comprises a driving MCU circuit, a constant-current channel circuit, a constant-voltage channel circuit, a current detection circuit, a voltage detection circuit, a temperature detection circuit, a communication circuit and a golden finger interface circuit, the constant current channel circuit, the constant voltage channel circuit, the current detection circuit, the voltage detection circuit, the temperature detection circuit and the communication circuit are all electrically connected with the driving MCU circuit, and the golden finger interface circuit is electrically connected with the communication circuit. According to the utility model, the driving module is hung on the bus structure, and the driving MCU circuit uniformly manages and distributes effective communication addresses and automatically identifies whether the driving mode is constant current or constant voltage driving, so that automatic adaptive configuration can be made according to different required powers on the module, the application scene is wide, and the maintenance is convenient.

The invention provides a step wave voltage collection system based on controlled impedance source control. The step wave voltage collection system comprises at least one new energy collection branch, a grid-connected end converter, a collection transformer and a transmitting end converter. Wherein the transmitting end converter adjusts the voltage of a common coupling point into a three-phase four-level step wave through a switching signal, the grid-connected end converter adopts a controlled impedance source control method, the grid-connected end converter is molded into a controlled impedance source, and the current of the common coupling point is controlled into the step wave synchronous with the voltage. In order to realize bidirectional flow of energy, a control mode of a constant power source is adopted when power flows forwards, and a control mode of a constant resistance source is adopted when the power flows backwards. Compared with a traditional step wave voltage collection system, the control method is simple, a phase-locked loop is not needed, and the cost and the size of the system are reduced. And meanwhile, voltage matching is not needed, and the steady-state current can be controlled to be constant when the grid-connected end is not matched with the sending end voltage.

The invention relates to the technical field of power supply management, and discloses a configurable constant-current constant-voltage power supply system. The system comprises a voltage stabilizing unit, a current sampling unit, a voltage sampling unit, an analog-to-digital conversion unit and a processing unit. The current sampling unit converts output current into a voltage signal through a first resistor; the voltage sampling unit converts the output voltage into a collectable voltage signal through a second resistor and a third resistor; the analog-to-digital conversion unit adopts two analog-to-digital converters to respectively acquire voltage signals of the first resistor and the third resistor; the processing unit carries out comparison according to a constant current value or a constant voltage value set by a user and generates a control signal through a processing algorithm, and the output voltage of the voltage stabilizing unit is adjusted through the digital-to-analog converter. A digital control scheme is adopted, a user can flexibly configure a working mode through software, and the device has the advantages of being high in control precision, flexible in parameter configuration and good in stability and is suitable for various application occasions needing precise current or voltage control.

The invention discloses a large-current constant-current source temperature rise testing device for a new energy wire harness, and the device comprises a box body, the interior of the box body is provided with a temperature measurement mechanism, the temperature measurement mechanism comprises a flat tube, the exterior of the flat tube is provided with a cooling assembly which is used for cooling when the temperature rise of the wire harness is abnormal, the exterior of the flat tube is provided with a stretching assembly, and the stretching assembly is used for stretching the wire harness. The flat tube is used for fixing and stretching two ends of the wire harness, the outer surface of the flat tube is fixedly connected with a fixing frame, the outer surface of the fixing frame is fixedly connected with the interior of the box body, and one end of the flat tube is fixedly connected with an arc piece. The problems that when a relay and a fuse fail, instant overload of a wire harness is caused, a wire is fused, an insulating layer is broken down or ignited, meanwhile, the wire harness needs to be stretched manually to be tightened, the tightening quality cannot be guaranteed, and the accuracy of a detection result is affected are solved.

The invention discloses a battery life-prolonging charging optimization method based on a PWM waveform. The method comprises the following steps: step 1, determining an initial state of a battery and pre-charging the battery; step 2, a PWM current rising transition stage; 3, a large-current constant-current charging stage; 4, a PWM current reduction transition stage; and step 5, carrying out low-current constant-current full charge and cut-off. According to the main principle of the method, the electrochemical inertia characteristic of a battery system is utilized, an average current which can be perceived and changes smoothly in the battery is generated through a PWM waveform with alternating high-frequency positive and negative currents, and therefore the problems of impact and polarization caused by traditional step currents are effectively avoided while rapid charging is achieved. According to the invention, seamless transition of the charging current between different stages is realized by accurately controlling the duty ratio change rule of the PWM, and an effective scheme is provided for improving the charging acceptance of the battery, prolonging the cycle life and improving the safety.

The present disclosure relates to a salt deposition amount monitoring method, device and system. The method comprises: obtaining a salt deposition amount calibration value sequence determined based on a target environment in which a to-be-monitored object is located; calibrating a mapping relationship between a relative humidity of the target environment, an impedance modulus value of an interdigital electrode and a salt deposition amount according to the salt deposition amount calibration value sequence to obtain a relationship curve cluster; obtaining a current constant-frequency AC impedance modulus value and a current relative humidity of the target environment collected by the interdigital electrode; and determining a current salt deposition amount matched with the current constant-frequency AC impedance modulus value and the current relative humidity according to the relationship curve cluster. The present scheme improves the accuracy of salt deposition amount monitoring.

The application relates to the technical field of power equipment, in particular to an emergency device. The emergency device comprises at least a host, which is provided with a first near field communication module; a base, which is detachably connected with the host, the base is provided with a second near field communication module, the second near field communication module is matched and associated with the first near field communication module; a power module, which is electrically connected with the near field communication module and used for supplying power for the near field communication module; and a charging and discharging circuit, which is electrically connected with the power module and used for constant-current constant-voltage charging for the power module. The emergency device can be quickly charged and discharged.