92results about How to "Improve power conversion efficiency" patented technology

The invention discloses a segmented energy storage direct-hanging convergence method based on photovoltaic direct-current networking, and relates to the technical field of segmented energy storage of photovoltaic direct-current networking, and the method comprises the steps: constructing a direct-current networking system, collecting the operation data of the direct-current networking, and constructing a data set; based on the data set, dynamically adjusting the output power of a plurality of energy storage modules in real time through an adaptive power distribution algorithm, and balancing each energy storage module according to the use frequency and depth; and constructing a long-term optimization strategy of the direct-current networking system based on real-time adjustment and control of the direct-current networking system, and continuously optimizing system configuration and algorithm performance. By combining direct current networking, segmented energy storage and an artificial intelligence algorithm, the electric energy conversion efficiency is remarkably improved, the equipment loss is reduced, load variable frequency driving is realized, the system structure is simplified, and the fault rate and the equipment cost are reduced. And meanwhile, energy storage utilization is optimized, the response speed and stability of the system are improved, and access of renewable energy sources is better adapted.

The invention provides an RTDS simulation-based DC booster control method and system for new energy grid connection, and relates to the technical field of new energy grid connection control, and the method comprises the steps: building an RTDS-based DC booster control simulation model for new energy grid connection; operating the control simulation model; acquiring voltage and current data of a low-voltage side and voltage and current data of a high-voltage side of the direct-current booster; obtaining output data of new energy direct current grid connection; based on the voltage and current data of the low-voltage side and the high-voltage side of the direct-current booster, an abnormal analysis value of the direct-current booster is obtained through an abnormal analysis method of the direct-current booster; based on the voltage and current data of the high-voltage side and the output data of the new energy direct current grid connection, an output anomaly analysis value is obtained through an output anomaly analysis method; and controlling the direct current booster through a neural network PID control algorithm according to the abnormal analysis value and the output abnormal analysis value of the direct current booster. According to the invention, the regulation and control accuracy of the DC booster for new energy grid connection is improved.

The invention belongs to the technical field of organic semiconductor photoelectricity, and discloses a triphenylamine dicarboxyl-containing self-assembly hole transport material, a synthesis method and application of the triphenylamine dicarboxyl-containing self-assembly hole transport material as a photoelectric device. The triphenylamine dicarboxyl group is used as an anchoring group, and a bridging unit and a hole transport unit are introduced into a molecular structure through a self-assembly monomolecular layer strategy, so that the hole transport material containing the triphenylamine dicarboxyl group is obtained; the technical problems of poor stability, poor device performance and the like of small organic molecules with anchoring groups in the prior art can be solved. The triphenylamine dicarboxyl group is introduced into the hole transport material, so that the efficiency of a photoelectric device can be improved, the service life of the photoelectric device can be prolonged, and the hole transport material comprises a perovskite solar cell, a perovskite light-emitting diode, a quantum dot light-emitting diode and the like.

The invention relates to a lift-off auxiliary system which comprises a traction body, a balance umbrella and an auxiliary mechanism. The traction body is used for providing initial lift force for the high-altitude acting module, and the initial lift force guides the high-altitude acting module to rise to a first altitude; the balance umbrella is connected with the traction body, and after the balance umbrella is opened windward, the balance umbrella and the traction body jointly continue to guide the high-altitude acting module to a second altitude for acting; the auxiliary mechanism is respectively connected with the balance parachute and the high-altitude acting module, and comprises a traction rope and a control piece for controlling the release and recovery of the traction rope; when the wind speed at the first altitude is not enough to open the balance umbrella, the control piece releases the traction rope, and the traction body continues to rise until the wind speed is enough to open the balance umbrella. According to the scheme, through the auxiliary mechanism, the traction body can continuously drive the balance umbrella to the height at which the wind speed is enough to open the balance umbrella, hovering of the air acting module is avoided, and it is ensured that the umbrella-ladder combined type high-altitude wind energy acting module can still smoothly lift off to do work when the low-altitude wind speed is relatively low.

The embodiment of the invention provides a non-fused ring electron acceptor containing an asymmetric side chain and a preparation method and application thereof, the non-fused ring electron acceptor containing the asymmetric side chain has the following structure: # imgabs0 #, R1, R2 and R3 comprise any one of branched chain type, straight chain type or cyclic alkyl containing 1-20 carbon atoms, and A is a strong electron withdrawing functional group. According to the non-fused ring electron acceptor containing the asymmetric side chain and the preparation method and application thereof provided by the embodiment of the invention, the aryl alkylamine asymmetric structure is introduced as the side chain, so that the molecular planarity of the non-fused ring electron acceptor can be maintained, and the molecular accumulation and solubility can be conveniently regulated and controlled. Therefore, the non-fused ring electron acceptor has the advantages of good solubility, strong crystallization, high mobility, good compatibility and easiness in processing into a film; when the electron acceptor material is used for preparing an organic solar cell, the photoelectric conversion efficiency of the device can reach 16%.

The invention discloses a four-switch Buck-Boost converter circuit for photovoltaic maximum power point tracking. The four-switch Buck-Boost converter circuit comprises a main circuit module, an input voltage detection module, an output voltage detection module, an output current detection module, a control output module and a driving amplification circuit module. The control output module comprises a micro-control unit, and the micro-control unit is provided with an ADC sampling interface and a PWM output interface. The main circuit module processes the input voltage of the photovoltaic panel and outputs direct current to charge the battery; the input voltage detection module, the output voltage detection module and the output current detection module are used for sampling the input voltage, the output voltage and the output current of the main circuit module and transmitting sampling values to the micro-control unit; the micro-control unit judges the mode of the main circuit module according to a sampling value, a PWM signal is output by the PWM output interface through an improved maximum power point tracking algorithm, and the on and off of a switching tube of the main circuit module are controlled through the driving amplification circuit module.

The invention relates to the technical field of wave power generation, and particularly discloses a wave power generation device based on magnetic liquid sealing, the device comprises a shell, a reciprocating power generation mechanism, a first cavity and a second cavity, the reciprocating power generation mechanism divides the inner cavity of the shell into a first chamber and a second chamber which are not communicated with each other, the reciprocating power generation mechanism comprises a first coil, a first magnetic assembly and magnetic liquid, the magnetic liquid is arranged between the first magnetic assembly and the inner wall of the shell, and the first magnetic assembly can be in sliding connection with the shell in the first direction through the magnetic liquid. The first cavity and the second cavity are arranged on the two sides of the reciprocating power generation mechanism respectively, an inner cavity of the first cavity communicates with the first cavity, an inner cavity of the second cavity communicates with the second cavity, the first cavity and / or the second cavity deform to apply acting force to the first magnetic assembly, and the first magnetic assembly can slide to change the magnetic flux of the first coil. Weak waves or irregular waves in different directions can be converted into electric energy, and the power generation efficiency is high.

The invention belongs to the technical field of photovoltaic panels, and particularly relates to an energy-saving elevator photovoltaic panel mounting structure which comprises a base station, a side wall is fixedly connected to one side of the base station, two outer stand columns are fixedly connected to the corners of the base station, and two symmetrical vertical shafts are arranged between the two outer stand columns. A vertical shaft is arranged between each outer stand column and the side wall and close to the outer stand column, multiple sets of second shaft seats are fixedly connected to the two outer stand columns, a photovoltaic panel frame is rotationally connected between each set of second shaft seats, and multiple first shaft seats are fixedly connected to the two inner stand columns close to the outer stand columns. Each first shaft seat is rotationally connected with a frame seat rotationally connected with the vertical shaft, each frame seat is rotationally connected with a photovoltaic panel frame, and the outer side of each photovoltaic panel frame is fixedly connected with a photovoltaic panel. The horizontal angle and the vertical angle of the photovoltaic panel frame and the photovoltaic panel are adjustable, so that the photovoltaic panel can be located at the optimal sunlight incident angle, the electric energy conversion efficiency of the photovoltaic panel is improved, the generating capacity is improved, and then the energy-saving effect is improved.

The dual-output energy conversion device, modulation method and power supply equipment provided by the present invention can greatly improve the bus voltage boosting capability of the conversion device by adopting the first electrical energy storage module, so that it can be used within a wider input voltage range. The first conversion output circuit and the second conversion output circuit are provided, and the voltage stress of all switch tubes is reduced to half of the DC bus voltage, which can greatly reduce the system EMI of the conversion device in high-frequency applications and improve the power conversion efficiency of the device. Compared with the traditional multi-stage structure, which needs to realize the midpoint voltage clamping of the front stage and the rear stage and other controls at the same time, and the control structure is complicated, the dual-output energy conversion device provided by the present invention only needs to realize the control of one-stage power conversion, and the control structure is simple.

The invention discloses a laser based on single-frequency continuous light oscillation and a laser output method, and the laser comprises a first reference laser which generates a first wavelength laser; the second reference laser generates second wavelength laser, and the second wavelength laser is single-frequency continuous light; the frequency multiplication module is coupled with the first reference laser and is used for converting the first wavelength laser into an up-conversion signal; and the sum frequency module is respectively coupled with the frequency multiplication module and the second reference laser, and is used for carrying out sum frequency on the second wavelength laser and the up-conversion signal to generate a target wavelength laser output signal of 184.13-283.81 nm. According to the laser structure provided by the invention, components are convenient to construct, the power requirement for reference light is low, the conversion efficiency is high during frequency conversion, time matching does not need to be carried out on various reference light during frequency sum, and deep ultraviolet band laser can be output as continuous light or pulsed light.

The invention relates to a manufacturing method of a permanent magnet power generator of a pure electric vehicle, which creatively fills up the following functions: (1) a technology which is equivalent to a secondary commercial power 220V / 50Hz alternating current power supply energy-to-electricity technology; the function (2) is equivalent to a secondary energy structure electronic power technology power engine'electricity-to-energy and electricity-to-electricity 'technology; the function (3) is equivalent to an energy-to-energy technology of a permanent magnet power automobile generator in a secondary energy structure electronic power technology, a DC power supply conversion technology of a DC / DC converter in energy recovery of an energy storage system, an inversion IGBT power module conversion control technology of a DC / AC converter, an electronic rectification technology of a silicon controlled rectifier charger, a DC filtering technology and a switching power supply technology. The invention relates to a technology blank of'energy-to-electricity and electricity-to-energy 'technologies converted by a silicon controlled rectifier control technology and a silicon controlled rectifier capacitive reactance load technology, new energy, new structures, new ideas, new methods and new technologies.

The invention is suitable for the technical field of perovskite solar cells, and provides an anti-solvent-resistant trans-perovskite solar cell and a preparation method thereof. The green anti-solvent dimethyl carbonate is used for replacing the traditional high-toxicity chlorobenzene anti-solvent, so that the problem of environmental pollution in the preparation process of the perovskite solar cell is solved. The prepared perovskite thin film is larger in grain size, higher in crystallization quality, fewer in defect and higher in flatness and density, most leakage current loss is reduced, energy loss caused by non-radiative recombination is restrained, and the current density of the perovskite solar cell is greatly improved. According to the perovskite solar cell, the carrier transmission problem is improved, carrier recombination between perovskite and the electron transmission layer is inhibited, and therefore the open-circuit voltage, the filling factor, the power conversion efficiency, the stability and the like of the perovskite solar cell are greatly improved.

This utility model discloses a transmission connection structure between an engine and a gearbox. This transmission connection structure connects the engine's output shaft to the gearbox's input shaft. The structure includes a housing, a slider, a rotating block, a clutch block, and a drive mechanism. The housing is mounted on the gearbox, the slider is slidably mounted inside the housing, the drive mechanism is mounted on the housing with one end extending into the housing and driving the slider to move within it, the rotating block is rotatably mounted inside the slider, and the clutch block is mounted in the inner cavity of the slider. The head of the input shaft is a perforated shaft that slides into a perforated groove in the rotating block, and the head of the output shaft is fitted to the clutch block. This transmission connection structure can replace the use of a vehicle clutch in agricultural machinery, providing a clutch effect. Furthermore, when disconnecting the power transmission between the engine and the gearbox, the input shaft experiences no additional load, improving power conversion efficiency. This structure is simple, easy to operate, suitable for agricultural machinery with simple transmissions, and also reduces costs.

This invention discloses an acid gas purification system based on dual high-speed permanent magnet explosion-proof centrifugal compressors, comprising an absorption purification system, an energy-saving flash evaporation system, and a heat pump distillation regeneration system. The flash tank of the energy-saving flash evaporation system is connected to a #1 demister; the outlet of the #1 demister is connected to the inlet pipe of the #1 high-speed permanent magnet explosion-proof centrifugal compressor, and the outlet pipe of the #1 high-speed permanent magnet explosion-proof centrifugal compressor is connected to the hot-side inlet pipe of the flash evaporator heat exchanger. The feed pipe at the top of the distillation column of the heat pump distillation regeneration system is connected to the cold-side outlet pipe of the bottom liquid heat exchanger; the distillation column is connected to a #2 demister; the outlet pipe of the #2 demister is connected to the inlet pipe of the #2 high-speed permanent magnet explosion-proof centrifugal compressor, and the outlet pipe of the #2 high-speed permanent magnet explosion-proof centrifugal compressor is connected to the shell inlet pipe of the reboiler. This invention fully utilizes the energy of the acid gas purification process, greatly improving the heat utilization rate of flash vapor, distillation column top gas phase, and bottom liquid, resulting in significant energy saving and consumption reduction.

This invention discloses an unmanned intelligent photovoltaic green electricity distribution device for mines, featuring source-grid-load-storage coordination. The device includes a base, with a nested shock-absorbing assembly at the top. Above the nested shock-absorbing assembly is an energy storage distribution box. An energy storage interface compartment is connected to the left side of the energy storage distribution box, and a distribution control box is located on the right side. A flexible connection assembly is positioned above the energy storage distribution box, and a source-grid adapter box is located above the flexible connection assembly. A dual-path photovoltaic rectifier compartment is located on the left side of the source-grid adapter box, and a mine microgrid connection compartment is located on the right side. Utilizing the dual-path photovoltaic rectifier compartment within the source-grid adapter box, synchronous conversion of two photovoltaic DC power sources is achieved, improving power conversion efficiency and filtering power noise. The mine microgrid connection compartment integrates voltage regulation and lightning protection functions, enabling efficient connection with the mine microgrid.

The application discloses a mine-used four-way explosion-proof and intrinsic safety type direct-current power supply with a communication function, which comprises five non-intrinsically safe AC_DC modules and DC intrinsic safety circuits connected with the non-intrinsically safe AC_DC modules, and is recorded as non-intrinsically safe AC_DC module 0-non-intrinsically safe AC_DC module 4. The non-intrinsically safe AC_DC module 0 is responsible for power supply of a power management module. Two power supplies of the non-intrinsically safe AC_DC module 1 and the non-intrinsically safe AC_DC module 2 are converged through the power management module to form a double-path power supply A. Two power supplies of the non-intrinsically safe AC_DC module 3 and the non-intrinsically safe AC_DC module 4 are converged through the power management module to form a double-path power supply B. The double-path power supply A is fused with a CAN bus and a vehicle-mounted Ethernet unit into an 8-core composite cable. The double-path power supply B is fused with another CAN bus and the vehicle-mounted Ethernet unit into an 8-core composite cable. The power supply internally adopts a four-way power supply parallel mode, can realize power supply with a larger power, has a higher power conversion efficiency, has a lower heat generation, and improves the safety of the power supply system.

The present invention discloses a resonant piezoelectric power generation system, comprising a piezoelectric generator, a resonant inductor L, a bridge rectifier circuit, a self-powered switch circuit and a charge extraction circuit which are electrically connected in series in sequence, and each part is electrically connected in series to form an overall circuit of the resonant piezoelectric power generation system. The automatic control of the system of the present invention is achieved by the self-power supply and automatic closing and opening of the self-powered switch circuit; by adding a resonant inductor L to the overall circuit and optimizing the design of the resonant inductor L, an optimal resonant inductance value can be obtained, which greatly improves the power conversion efficiency of the traditional synchronous charge extraction circuit. The present invention also discloses a resonant inductance optimization method for a resonant piezoelectric power generation system; the optimal resonant inductor used can greatly increase the output voltage of the piezoelectric generator, improve the AC-DC conversion efficiency of the traditional synchronous charge extraction circuit for piezoelectric power generation, achieve efficient vibration piezoelectric power generation, and thus improve the power conversion efficiency of the system.

This invention provides a wide-bandgap perovskite thin film, a perovskite tandem solar cell, and a method for preparing the same, relating to the field of photovoltaic technology. The method for preparing the perovskite thin film includes: adding a perovskite structural material and an organic additive to an organic solvent to obtain a perovskite precursor solution; spin-coating the perovskite precursor solution onto a substrate; and annealing the substrate to obtain the perovskite thin film. The organic additive includes a material containing a thiophene dioxide framework. The organic additive used in this invention can effectively regulate the crystallization rate of mixed halides, delay crystallization, enhance the uniform distribution of the mixed halide phase, reduce the defect density in the wide-bandgap perovskite thin film, and significantly improve the power conversion efficiency and stability of the solar cell, thereby obtaining a high-performance tandem solar cell.

The invention relates to the field of charging pile power supply modules, and discloses a circuit structure for reducing standby reactive power of a charging pile power supply module, which comprises an alternating-current power grid, a relay assembly, an auxiliary power supply circuit with two power taking circuits and a filter circuit, and is characterized in that the alternating-current power grid is connected with the relay assembly, and the relay assembly is connected with the filter circuit; the two electricity taking circuits of the auxiliary power supply circuit are respectively connected with the relay assembly and the filter circuit, the relay assembly and the filter circuit output voltage to the auxiliary power supply circuit, during standby work, reactive power of the EMC filter circuit can be reduced, meanwhile, the control circuit is powered on, communication signals can be kept smooth, and starting can be conducted at any time; during normal work, a newly added auxiliary power supply electricity taking access can be cut off through the small relay, a better EMC filtering effect is obtained, and the electric energy conversion efficiency is higher.

The present invention provides an LED driving circuit and a control method with a voltage regulation function. The LED driving circuit includes a control circuit and a voltage regulation circuit. The voltage regulation circuit includes a filter circuit, a detection circuit and a boost circuit. The voltage regulation circuit is electrically connected to the control circuit. The detection circuit is electrically connected to the filter circuit. The boost circuit is electrically connected to the filter circuit and the detection circuit. The control circuit is used to control the sub-circuit of the voltage regulation circuit. The detection circuit is used to detect the voltage level of the input voltage. The control circuit controls the boost circuit to perform staged boosting according to the voltage level of the input voltage detected by the detection circuit. The LED driving circuit provided by the present invention can perform staged boosting according to the voltage level of the detected input voltage, wherein the voltage regulation function is completed by staged boosting to increase the power conversion efficiency.

The present invention discloses a wide-range operation staggered parallel LLC resonant converter and control method, which relates to the field of power electronic conversion technology, including: N LLC resonant conversion units, the LLC resonant conversion units include inverters, resonant networks, transformers and secondary side rectifier circuits connected in series in sequence; the input ends of the N inverters are connected in parallel to the DC input end; the output ends of the N secondary side rectifier circuits are connected in series; wherein the first output end of the first secondary side rectifier circuit serves as the first DC output end, and the second output end is connected to the first output end of the next secondary side rectifier circuit until it is connected to the first output end of the Nth secondary side rectifier circuit, and the second output end of the Nth secondary side rectifier circuit serves as the second DC output end. The power conversion with wide range operation, high power transmission and high step-up ratio is realized, while taking into account the conversion efficiency and inter-phase current sharing.

A tandem photovoltaic device is provided by the present disclosure and relates to the technical field of solar photovoltaic. The tandem photovoltaic device includes a perovskite absorbing layer, a crystalline silicon absorbing layer and a single-layer electrical function layer connected in series to the two absorbing layers; a contact interface between the perovskite absorbing layer and the single-layer electrical function layer is a first series interface; and a contact interface between the crystalline silicon absorbing layer and the single-layer electrical function layer is a second series interface; wherein a conducting type at the second series interface is different from a conducting type at the first series interface, and the difference between the work functions is ≥ -0.3eV and ≤ 0.3 eV. Since the difference of the work functions between the perovskite absorbing layer and the crystalline silicon absorbing layer of the tandem photovoltaic device at the contact interface is ≥ -0.3 eV, and ≤ 0.3 eV, the work functions of the two absorbing layers are matched, the voltage loss caused by the work function mismatch is avoided, and the intermediate series structure does not need energy band buffering and is a single layer, the carrier parasitic absorption caused by the introduction of multilayer electrical function layers may be reduced, and the transmission loss caused by interface resistance and defects reduce is reduced.

The present invention proposes a light-load control method for a bidirectional power supply in an electric energy storage system, and relates to an electric energy storage system. The control method is implemented based on a 3-level Buck‑Boost hardware topology. When the bidirectional power supply is lightly loaded, the 3-level wave generation mode is switched to the 2-level wave generation mode. Otherwise, the 2-level wave generation mode is exited and restored to the 3-level wave generation mode. During the 2-level wave generation period, if the actual output voltage is higher than the expected output voltage by 99%, the PWM wave is controlled to be blocked after a normal output of a switching cycle, and the output of the PWM wave is stopped; during the blocking period, if the actual output voltage is lower than 98% of the expected output voltage, the blocking is stopped and the PWM wave is output. The technical solution proposed by the present invention reduces the switching frequency of the power tube, improves the power conversion efficiency, reduces energy loss, and increases the service life of the equipment, while ensuring that the power supply provides sufficient support for the load.

The present invention belongs to the technical field of power electronic converters, and discloses a three-port power router topology and control method for high-reliability power supply. The topology structure includes three connected reactors L, a chain SVG, a three-phase isolation transformer, a three-phase LC filter, a three-phase three-port H-bridge inverter circuit and an energy storage DC port. The present invention forms a three-port converter topology with high-voltage AC, low-voltage AC and energy storage DC through the fusion of multi-form high and low voltage conversion topologies. Its control method can realize the reactive power compensation function of the chain SVG; the three-phase three-port H-bridge inverter circuit can maintain the voltage stability of the 380V low-voltage AC bus and provide active power support for the chain SVG; when a fault such as a grid voltage drop occurs in the 10kV AC feeder, the fault can be isolated through the chain SVG, thereby realizing high-reliability power supply of the 380V low-voltage AC bus.

The application provides a droop control method and device for an energy storage system in a direct-current microgrid, and the method comprises the following steps: obtaining an initial droop curve; determining a boundary condition of a droop control parameter in the droop curve; establishing a target function with the highest cycle efficiency of the energy storage system in full charging and full discharging as a target; establishing a droop curve optimization model according to the target function and the boundary condition; solving the droop curve optimization model to obtain an optimal solution of the droop control parameter, so as to update the initial droop curve; and controlling the energy storage system by using the updated droop curve. The application can improve the power conversion efficiency of the energy storage system, and improve the economy and service life of the energy storage system and even the entire direct-current microgrid.

The application relates to a flexible charging module control method and device supporting V2G, comprising the following steps: determining whether there is a hard switching risk according to the comparison result of the load power value and the preset threshold value; in the case that there is a hard switching risk, adjusting the resonant frequency of the CLLL topology to the first frequency interval based on a frequency-duty cycle hybrid modulation strategy, making the resonant current phase and the switch tube voltage phase form a preset phase difference, and adjusting the drive signal duty cycle of the primary side switch tube and the secondary side switch tube, so that the conduction time difference of the primary side switch tube and the secondary side switch tube increases with the decrease of the load power value; based on an adaptive frequency spectrum expansion algorithm, the resonant frequency is periodically dithered in the first frequency interval with a preset step, and the dithering period and the switching period of the switch tube are in a nonlinear mapping relationship; the bidirectional power conversion efficiency is improved, the light load hard switching and electromagnetic interference problems are solved, and the reliable operation of the charging module in the V2G scene is ensured.

The utility model provides an assembled brushless rotary transformer, which overcomes the defects of higher structural complexity and higher processing and assembling difficulty of the conventional assembled brushless rotary transformer. Starting from the structure of the assembly type brushless rotary transformer, through the innovative design of the main shell, the rear cover, the screw ring and the assembly form, compared with a redundant structure of a traditional structure, the integrated structure of the main shell and the screw-free rear cover enables the overall structure of the rotary transformer to be simpler and more compact, the size is further reduced, and the structure is more compact. The overall assembly is simpler, the product integration degree is improved, the assembly difficulty and errors of products are greatly reduced, the assembly workload is reduced, the design precision is ensured, the assembly precision is improved, and therefore the product precision is improved.

The invention provides a charging circuit, charging equipment and a charging system, the charging circuit comprises a phase-shifting transformer, the phase-shifting transformer is provided with a plurality of groups of secondary windings, each group of secondary windings comprises a plurality of phase-shifting secondary windings, and each phase-shifting secondary winding is used for outputting an AC voltage signal to enable each group of secondary windings to output a plurality of AC voltage signals; and each group of secondary windings is electrically connected with at least one alternating current-direct current conversion circuit in the alternating current-direct current conversion circuits, and each alternating current-direct current conversion circuit is electrically connected with a plurality of phase-shifting secondary windings of one group of secondary windings in the phase-shifting transformer. The charging gun heads of the charging circuit meet the electrical isolation requirement through the phase-shifting transformer, a direct-current isolation circuit and a power factor correction circuit do not need to be arranged, components of the charging circuit can be reduced, and the power conversion efficiency of the charging circuit can be improved.

The invention relates to the technical field of solar charging, and discloses a control method for a flexible solar charging assembly of electric equipment, and the method comprises the steps: unfolding the flexible solar charging assembly to cover at least one part of the surface of the electric equipment, and obtaining illumination intensity data corresponding to a current environment, adjusting the electric energy conversion efficiency of the flexible solar charging assembly based on the illumination intensity data; when the electric equipment is in a static state, the flexible solar charging assembly is controlled to be in a maximum unfolding state so as to maximize solar energy absorption; when the electric equipment is in a moving state, the flexible solar charging assembly is partially or completely folded under control so as to absorb solar energy; when the flexible solar charging assembly charges the mobile device, charging state data corresponding to the flexible solar charging assembly and charging demand data corresponding to a battery of the electric device are obtained, and a charging strategy is adjusted based on the charging state data and the charging demand data. According to the scheme, the charging management efficiency of the electric equipment can be improved.

The utility model relates to the technical field of power supply voltage regulation circuits, and provides a one-way fan direct-current voltage regulation and speed regulation circuit which comprises a direct-current voltage reduction circuit connected with a PWM / DAC weight regulation circuit used for controlling the speed of a direct-current fan. And the step-down chip U1 is arranged in the direct-current step-down circuit and is used for realizing a step-down function in the direct-current step-down circuit. According to the circuit, a direct-current voltage reduction and speed regulation control strategy is optimized, continuity and stability of output voltage are ensured, the common voltage jitter problem in a traditional scheme is avoided, the circuit design effectively suppresses reverse electromotive force, the reliability and safety of a system are improved, meanwhile, the scheme improves the power conversion efficiency, heat is reduced, and the service life of the system is prolonged. The speed regulation control mode is simplified, smooth fan speed regulation is achieved, and the user experience and the energy utilization efficiency are remarkably improved.