621results about How to "Stable output power" patented technology

The invention discloses a dynamic wireless charging apparatus and a parameter acquiring method thereof. The dynamic wireless charging apparatus comprises an energy emitting module and an energy receiving module. The energy emitting module comprises a high-frequency inversion unit, an LC filter unit, a first compensation unit, and a power emitting coil which are successively connected. The high-frequency inversion unit converts DC power into high-frequency AC power. After the high-frequency AC power is adjusted by the LC filter unit and the first compensation unit, energy is emitted in a high-frequency magnetic field coupling mode. The energy receiving module comprises a power receiving coil, a second compensation unit, and an uncontrolled rectification unit which are successively connected, and converts received high-frequency AC power into DC power supplied to a load. The dynamic wireless charging apparatus may automatically adjust the current of a primary-side power coil according to the mutual inductance coupling degree of the power coil so as to obtain a characteristic maintaining stable output power, is suitable for dynamic wireless charging application occasions with a wide bias, and has high transmission efficiency and a soft switch characteristic. In addition, compensation topology provides a primary side inversion power supply with a zero-load current-limiting protection function.

The invention discloses a dynamic wireless power supply system used for an electric vehicle and based on parallel multistage composite resonant structures and a power supply method realized by adopting the system, belongs to the field of wireless power transmission, and solves problems of mutual inductance non-uniform of long-distance power supply coupling mechanisms and electromagnetic radiation generated for pedestrians in an existing road-type dynamic wireless power supply technology for electric vehicles. The dynamic wireless power supply system comprises a network-side power supply system and an electric vehicle-side power receiving system, wherein the network-side power supply system is used for wirelessly supplying power to the electric vehicle-side power receiving system; electric energy output by an electric network is transmitted to a high-frequency inverter through a power-frequency rectifier, and n stages of composite resonant circuits are connected in parallel with an alternating-current bus of output of the high-frequency inverter; an alternating-current switch is arranged on a branch of each stage of composite resonant circuit, a magnetic sensor is arranged in the center of two adjacent emitting windings or the geometric center of each emitting winding, a receiving winding is arranged on a receiving resonant circuit, and a magnetic nail is arranged on the receiving winding and mounted in the geometric center of the receiving winding. The dynamic wireless power supply system is mainly used for performing wireless power transmission on the electric vehicle.

The invention provides a fuel cell and lithium ion battery hybrid system, which comprises a fuel cell subsystem, a lithium ion battery subsystem, a charge control subsystem, an intelligent hybrid power management system, a motor and a motor control system. A fuel cell serves as a main operation power source while a lithium ion battery serves as an auxiliary power source. The problems that the fuel cell of the pure fuel cell automobile is short in service life and the energy is unrecyclable can be solved, and the problems of long charge time, potential burning and explosion in continuous high-current discharge, attenuation and self discharge of the pure lithium ion battery electric vehicle are also solved. Service lives of the fuel cell and the lithium ion battery are effectively prolonged, the cost of the power system is reduced, reliability and safety are improved, energy recovery is realized, and accordingly the fuel cell and lithium ion battery hybrid system is an excellent solution to the power source problem of electric vehicles.

A wireless power receiver for wirelessly receiving a supply of power from a wireless power supplier is disclosed. The wireless power receiver includes a power reception unit for wirelessly receiving wireless power from the wireless power supplier; a rectifier for rectifying the wireless power into power including a DC waveform; a power adjustor for configuring a closed loop with the power reception unit for a first period and transferring the wireless power to the rectifier for a second period to adjust a size of the wireless power; and a controller for determining the first period and the second period, wherein the power adjustor is electrically connected to the power reception unit and the rectifier.

The invention discloses a system for providing over-current protection for a switching power converter. The system comprises a front-edge blanking circuit, a linear compensation circuit and an over-current protection comparer, wherein the front-edge blanking circuit is configured to generate a front-edge blanking effect on a detection signal of a current which flows through an external switching tube of the switching power converter; the linear compensation circuit is configured for performing linear compensation on a threshold voltage of the over-current protection comparer; and the over-current protection comparer is configured for generating an over-current protection comparison signal. By a linear compensation over-current protection circuit, the time delay of a system internal over-current protection output signal is taken into consideration, so the permanent damage of a switching tube of a metal-oxide semiconductor field effect transistor (MOSFET) caused by large-current conduction which may be generated at a high input voltage is avoided; and a maximum output power is stabilized, so the maximum power planarization of a power system can be realized in a full-voltage input range.

The invention relates to an MEMS wideband piezoelectricity energy collector based on a bistable state frequency raising structure in the technical field of electric appliances, which comprises a frame, a bistable state beam arranged in the frame, a piezoelectric over hanging beam, a permanent magnet and a soft magnet. The MEMS wideband piezoelectricity energy collector is characterized in that twoends of the bistable state beam are both fixed on the frame, the permanent magnet is attached to the bistable state beam, on end of the piezoelectric over hanging beam is fixed on the frame, and thesoft magnet is arranged on the piezoelectric over hanging beam. The invention adopts a bistable state frequency raising structure to enable a piezoelectric transduction component to obtain greater output power in a low-frequency vibration environment. Compared with the prior MEMS piezoelectric energy collector, the invention has simple structure, easy manufacture and volume reduction, can be operated in a low-frequency environment, and can output stable frequency within wider environment vibration frequency range.

The invention discloses a tunable laser system, a acousto-optic tunable filter that utilizes frequency offset compensation. Precision and stability of the output wavelength are realized by a wavelength lock; the wavelength lock utilizes two separated cavity laser beam to avoid using a beam splitter, which reduces requirements to space comparing to a tradition wavelength lock, and running is more stable, and assembly easier. The acousto-optic tunable filter comprises a acousto-optic crystal and a acoustic wave transducer that are bond on surface selected by a crystal to generate acoustic wave;an optical reflector is used for reflecting the diffracted ray back to the acousto-optic medium; because the two incident rays are opposite relative to the acoustic wave propagation direction, the frequency offset generated by the two diffraction is compensated. The invention can be used to produce wideband tunable laser system for various applications with different laser gain medium, acoustic wave drive frequency and acousto-optic crystal.

The invention discloses a variable speed-variable pitch combined control method of a variable speed constant-frequency wind turbine generator. According to the control method, an optimal rotating speed estimated value and a rotating speed reference value are introduced to respectively serve as reference quantities of rotating speed control and variable pitch control. A rotating speed PID controller performs torque command regulation according to the deviation of the optimal rotating speed estimated value and the rated rotating speed of the wind turbine generator, a variable pitch PID controller performs pitch angle command regulation according to the deviation of the rotating speed reference value and the rated rotating speed of the wind turbine generator, decoupling control between rotating speed control and variable pitch control is achieved, and interference between rotating speed control and variable pitch control is avoided. When wind speed fluctuates nearby the rated value and pneumatic power captured by the wind turbine generator is larger than rated power, the rotating speed reference value corresponding to a pneumatic power estimated value is larger than the rated rotating speed of the wind turbine generator, the variable pitch PID controller regulates a pitch angle command before a torque command output by the rotating speed PID controller reaches the rated value, and variable speed-variable pitch combined control is achieved in advance to control rotating speed of the wind turbine generator and overshooting of output power.

The invention discloses an ultrasonic scalpel system based on frequency and power tracking and a control method thereof. The ultrasonic scalpel system comprises a main control MCU, a DDS-based signalgeneration control module, a power output isolation module, an interaction module and a medical switching power supply, wherein the signal generation control module uses a DDS chip to generate two paths of high-precision PWM signals with specific frequencies, and the power is controlled by a digital control half-bridge power adjusting circuit based on a clock circuit; and the power isolation module is used for matching the inductive reactance through the series power inductance, providing an interface for an ultrasonic scalpel, and respectively using a PID algorithm and an ADRC algorithm to control the power output and the working frequency of the ultrasonic scalpel in real time so as to achieve the real-time control of the power and the follow-up control of the resonance point frequency.The system has the advantages of high control precision, high response speed, good operation effect, high energy utilization rate, convenient operation and the like, and is suitable for driving ultrasonic surgical scalpel equipment in common ultrasonic surgical operations.

The invention relates to a tunable laser. Two laser gain mediums, one acousto-optic tunable filter and a single radio frequency transducer, one phase modulator and a signal control processing circuit based on micro processor are adopted; wherein the acousto-optic tunable filter comprises an acousto-optic crystal and an acoustic wave transducer which is welded on the surface selected by the crystal to generate acoustic wave, and different laser gain mediums, acoustic wave driving frequencies and acousto-optic crystals are utilized to manufacture various wideband tunable lasers for different applications. The invention has reasonable design, meets the requirements of submilisecond tuning speed, small size and high reliability under extreme condition in fiber optical communication, has the characteristics of fast tuning speed, low intracavity loss and high power output and realizes wide application of tunable laser with low cost, easy manufacturing and high performance in fiber optical communication network.

The invention relates to an arm-length-variable vertical shaft tide current water turbine generator set which belongs to the field of development of renewable energy sources. The generator set mainly comprises a blade, an arm seal, a telescopic arm, a piston, a fixed arm, a hydraulic cylinder for shortening, a hydraulic cylinder for extending, a support wheel disk, a compressing nut, a tide current speed and direction sensor, a main shaft, a main shaft bearing, a big gear, a support seat, a hydraulic oil station, a hydraulic pump for shortening, a hydraulic pump for extending, an electric brush, an integrated control system, a shaft neck seal, a small gear shaft bearing, a small gear shaft, a coupling and a generator. The telescopic arm is dynamically extended or shortened in the rotatingprocess of the blade according to the tide current direction and flow speed; and when the normal of the telescopic arm is parallel or perpendicular to the tide current direction, the telescopic arm is respectively changed to be the longest or shortest so that a vertical shaft tide current water turbine reaches highest energy capture efficiency. The self-start capability of the water turbine on low-speed tide current can be also improved by adjusting the telescopic arm. The arm-length-variable vertical shaft tide current water turbine generator set disclosed by the invention can be used for the comprehensive utilization and development of river water flow energy and ocean tide current energy.

The invention discloses a comprehensive deep sea energy utilizing system. The comprehensive deep sea energy utilizing system comprises a wind turbine, a temperature difference energy generating device, a wave energy utilizing device and an ocean current energy utilizing device. The temperature difference energy generating device comprises a flash evaporator, a working medium circulating unit and a generator, liquid working medium in the working medium circulating unit is delivered to an evaporating heat exchanger via a working medium pump, is changed into unsaturated air by absorbing heat in the evaporating heat exchanger to push a steam turbine to act, and then enters a condensing heat exchanger to be condensed into liquid to flow back to the working medium pump. In the ocean current energy utilizing device, the upper end of a tower column is fixed connected at the bottom of a floating platform, a hydraulic turbine for driving the working medium pump is arranged on the tower column and close to the lower end. The wave energy utilizing device comprises a plurality of floater power units which are arranged below the floating platform and close to the sea surface, a water inlet of at least one floater power unit I is communicated with the surface seawater, a water outlet of the one floater power unit I is communicated with the flash evaporator, a water inlet of at least one floater power unit II is communicated with the deep seawater, and a water outlet of the one floater power unit II is communicated with the condensing heat exchanger.

The invention discloses a laser transceiving device, a manufacturing method thereof and a method for improving temperature operation range thereof. A low-cost laser transmitter module TOSA (transmitter optical subassembly) is utilized to broaden the temperature operation range of laser transceiving integration modules of a small form-factor pluggable transceiver (SFP) or an SFP+ and the like, and a heater and a laser diode are packaged and integrated in the TOSA of a TO-CAN. Operation temperature of the SFP+ laser transceiving module is monitored by integrating a temperature sensor on a circuit board of the SFP+, or operation temperature of a TOSA laser is calculated by detecting bias current and output power of the laser, the heater in the TOSA positioned on the laser transceiving module is controlled through a heat control circuit and software, the software starts the control circuit and supplies power to the heater to heat the laser diode if the detected temperature is lower than a set threshold, and the software switches off the control circuit to stop heating the laser diode if the detected temperature is higher than the set threshold.

The invention publishes a low noise harmonious mono-frequent optical fiber laser which is used in the entire optical communication and its test system, aimed at solving the density change of the free current carrier in the source area of the semiconductor laser launch process, caused the twitter effect to cause the line-breadth phenomenon, could not satisfy the question that the high speed large capacity development request of the high speed wavelength division multiplying system and the optical communication. The laser contains the pump source, the optical coupler, the light isolator, the invariable light attentuator, the wavelength division multiplexer, the erbium ytterbium double mix optical fiber, the light circulator, the optical fiber polarizer, the er-doped optical fiber and the harmonious fiber grating. The test system is composed of the optical fiber laser, the light modulator, the actuation module, the error code analyzer, the light oscilloscope or the error code analyzer, the receive module and the light attentuator. The laser has mono-frequent, low noise, low twitter; the output is stable; suitable to use in the high speed long distance optical communication and take as the photo source in the optical fiber sensing; the test system may carry on the test analysis to laser's high speed electric light modulating characteristic.

The invention discloses a method for generating stable, full-time low noise laser output. The method includes the following steps: regulating and maintaining a semiconductor laser operating temperature by means of a thermoelectric controller (TEC) attached on the laser; generating a direct-current bias from a direct-current generator; generating an amplitude-modulatable radio frequency signal from a local oscillator; superposing the radio frequency signal onto the direct-current bias to generate amplitude-modulatable drive current; injecting the amplitude-modulatable drive current into the semiconductor laser by way of input-coupled impedance matching; regulating the direct-current bias by means of an automatic power control circuit; and optimizing the amplitude of the radio frequency signal. By modulating the driving of the semiconductor laser diode, the method effectively overcomes the mode hopping phenomenon, the method is applicable to laser diodes with various wavelengths, the generated laser output has the advantages of low coherence, low noise, little speckles, long-time stable output power and long-time uniform beam illumination, and the method is particularly suitable forbiomedicine and medical diagnosis and clinic.

The invention relates to a low profile high performance wavelength tunable laser, wherein the tunable laser resonance cavity uses a dispersion compensation acousto-opto tunable filter. Precision and stability of the output wavelength is determined by a wavelength locker. The wavelength locker uses two beams of isolated intra-cavity laser beams, so that use of a beam splitter is avoided. Comparingwith design of ordinary beam lockers, requirement to the space is lowered, the operation is more stabilized, and the assembling is easier. The acousto-opto tunable filter has a structure that two transducers in opposite directions are welded on the same crystal for generation of two acoustic waves transmitted in opposite directions. Chromatic dispersion generated by diffusing the collimated lightby a first acoustic wave can be compensated by a second acoustic wave in the opposite direction. By using different laser gain medium, acoustic driving frequency and acousto-opto crystals, the invention can be used for manufacturing tunable laser in wavelength ranges of various kinds of applications.

The invention discloses a variable pitch and variable speed wind generating set, comprising a three-blade wind turbine for collecting wind energy. A wheel hub of the three-blade wind turbine is internally provided with a variable pitch device; a main shaft of the three-blade wind turbine is connected with a speed-increasing box which is connected with a synchronous generator with a coaxial exciter by a coupler; and the variable pitch device and the synchronous generator are connected with a PLC control panel which is used for controlling the connected variable pitch device to adjust blade angle, thus adjusting an output power value of the generator. The wind generating set adopts the combination of a variable pitch controller and a power controller, completes optimization to the output power of the set and leads the set to operate in optimal state, thus obtaining maximum wind energy utilization ratio and improving the generating efficiency of the set. The wind generating set can absorb and release transient wind energy, has smooth and stable output power of the set, good electric energy quality and small shock to load of a transmission mechanism. A frequency converter has high reliability and the cycle operation speed of a main controller of the wind generating set is high.

The invention discloses a wide spectrum optical fiber source which has stable optical power and average wavelength. The optical fiber source comprises a microprocessor (1), a light signal acquisition circuit (2), a monitoring detector (3), a magneto-optical attenuator (4), a pump laser drive circuit (5), a temperature sensor (6), an attenuator drive circuit (7), a pump laser (11), a wavelength division multiplexer (12), an optical fiber ring (13), a gain flattening filter (14) and a fiber optic isolater (15); wherein, the pump laser (11), the wavelength division multiplexer (12), the optical fiber ring (13), the gain flattening filter (14) and the fiber optic isolater (15) form into the light path part of the wide spectrum optical fiber source; and the magneto-optical attenuator (4), the monitoring detector (3), the microprocessor (1), the pump laser drive circuit (5), the attenuator drive circuit (7), the light signal acquisition circuit (2) and the temperature sensor (6) form into the signal acquisition and processing part of the wide spectrum optical fiber source. The control device of the invention realizes the independence and simultaneous control of the two parameters of the average wavelength and the optical power through introducing the magneto-optical attenuator. The whole control system adopts whole digit mode and improves the stability of the average wavelength and the optical power of the wide spectrum optical fiber source.

The invention relates to a power fluctuation and malfunction control system and method of a direct-current-transmission double-fed wind turbine set, and belongs to the field of wind power. The system includes a double-fed power generator, a stator-side converter, a rotor-side converter, a net-side direct-current converter and an energy storage system. According to the method, firstly, the energy storage system supplies power to the rotator-side converter to achieve inverse conversion; secondly, after a draught fan is enabled, the stator-side converter conducts rectification boosting, the net-side direct-current converter conducts constant power control and controls the energy storage system to charge and discharge electricity to achieve power fluctuation suppression; if voltage drop occurs to a power network, the net-side direct-current converter conducts constant direct voltage control, and the rotator-side converter and the energy storage system run in a voltage drop malfunction control mode; if overvoltage occurs to the power network, the energy storage system conducts voltage clamp on the power network; if the network is disconnected, the net-side direct-current converter conducts constant direct voltage control, the rotator-side converter makes the output power of the power generator turn to zero; and finally, the net-side direct-current converter is switched off. The power fluctuation and malfunction control system and method of the direct-current-transmission double-fed wind turbine set are conducive to usage of the double-fed wind turbine set in a flexible direct current transmission system.

The invention relates to solar energy generating system control device and method. The device comprises a generating module, an inversion module, a master control module and a debugging module, wherein the generating module comprises a solar energy generating set, a maximum power tracking control circuit and a storage battery pack; the inversion module comprises an inverter, an analog direct current load and an analog alternating current load; the master control module comprises a DSP (Digital Signal Processor), a maximum power tracking controller, a storage battery controller, a collecting device and a signal modulation circuit; and the debugging module comprises an ARM7 processor, a solar cell panel angle regulator and a storage battery detector. By monitoring running states under a plurality of groups of working parameters in real time, electric energy utilization rate is maximum and while ensuring the normal work of the load, so that the running stability of the system is improved. A variable step size perturbation and observation method is adopted to conduct maximum power tracking so as to ensure the practical effect of MPPT (Maximum Power Point Tracking). The capacity of a storage battery and uninterrupted power supply time can be calculated by combining the longest continuous overcast and rainy days, ambient temperature and duration, and the service life of the storage battery is prolonged.

The invention discloses a power tracking control device and a power tracking control method for a mobile equipment wireless power supply system. A frequency-power adjustable power supply supplies power to a transmitting device, a receiving device and the transmitting device are subjected to resonant coupling and transmit received electric energy to a load line, and then a stabilized voltage direct current is output by a rectifying and voltage stabilizing system to supply power to mobile equipment; when power is supplied, a power tracking controller detects an input voltage of the rectifying and voltage stabilizing system and sends a signal to regulate a power or a frequency of the frequency-power adjustable power supply; and simultaneously, the power tracking controller detects an output voltage of the rectifying and voltage stabilizing system and sends a signal to regulate a duty cycle of switching of a DC / DC (Direct Current to Direct Current) converter in the rectifying and voltage stabilizing system. The problem of power attenuation caused by resonant frequency drift in the working process of the wireless power supply system is solved; and the mobile equipment is guaranteed to normally work.

The invention discloses an intelligent repeater and an automatic adjusting method for the parameters thereof. The intelligent repeater station includes a donor antenna, a retransmission antenna, a radio frequency transceiver hardware unit, a power detecting component, a control center and an intelligent control system. The control center includes a base station information monitoring module, an information analyzing module and a communicating module. The intelligent control system includes a monitoring unit and a control unit. The monitoring unit includes a device monitoring module and the communicating module. The control unit includes the information analyzing module and a control module. The invention gathers the information from the base station and the self parameter information of the repeater through the control center and the intelligent control system and carries out analyzing and calculating on the information according to certain arithmetic and automatically adjusts the parameters of the repeater according to the calculating results. Adopting the intelligent station and the automatic adjusting method for the parameters thereof can realize automatic frequency control and adjustment and increases the effectiveness of network coverage as well as realize automatic multi-carrier power control to lead each carrier output power to be stable and improve the quality of network. The invention can automatically control a spurious emission power and prevent the base station from being continuous interrupted.

The invention discloses a self-powered environmental-friendly street lamp and a square lamp, and belongs to the technical field of new energy power supply equipment system device. The self-powered environmentally-friendly street lamp and the square lamp comprise that: a main shaft (3) passes through a rain cover (2); a solar photovoltaic panel or horizontal axis wind-driven generator (1) is arranged at the top of the main shaft; and a vertical axis wind-driven generator is arranged in the middle part of the main shaft. The self-powered environmentally-friendly street lamp and the square lamp are characterized in that: the main shaft (3) made of a large-caliber steel pipe directly supports and is in through connection with the solar photovoltaic panel or the horizontal axis wind-driven generator so that the vertical axis wind-driven generator, the horizontal axis wind-driven generator and the solar photovoltaic panel are coaxially used so as to comprehensively utilize the three generation functions; a lamppost is provided with an air passage and an air inlet (12) to integrate the designs of the internal ventilation, heat dissipation and induced wind power and the external natural wind power with the internal structure of the generator into a whole, scientifically exert various natural potentials, reduce occupied space and obviously and effectively increase the generation effect.

The invention relates to a combined type oscillation floater wave energy power generation device which comprises a power generation system and a fixing system. The fixing system comprises a snorkeling body, a fixing frame and a working platform, wherein the fixing frame is fixedly connected to the top of the snorkeling body, and the working platform is arranged on the top of the fixing frame. The power generation system comprises floaters, a hydraulic motor and four identical hydraulic transmission mechanisms and an electric generator, wherein each hydraulic transmission mechanism is arranged among three guide rods on each corner of the fixing frame. The floaters are arranged on the four corners of the fixing frame, each corner of the fixing frame is provided with three guide rods to be movably connected with the corresponding floater, and the guide rods are sleeved with the floaters. The hydraulic motor is arranged on the working platform. Each hydraulic transmission mechanism comprises a hydraulic cylinder, an oil pipe and an oil tank, wherein the hydraulic cylinder is located above the corresponding floater, the sleeve end of the hydraulic cylinder is fixedly connected to the corresponding three guide rods through a triangular frame, and a piston rod of the hydraulic cylinder is fixedly connected with the corresponding floater through a fixing disc. The combined type oscillation floater wave energy power generation device can output relatively-stable electric energy and is slightly affected by wave impact.

The invention provides an MEMS broadband piezoelectric energy collector based on a PDMS film structure, belonging to the technical field of a micro electro mechanical system (MEMS). The collector comprises a round frame, a PDMS film, a plurality of piezoelectric cantilever beams and a mass block, wherein the PDMS film, the plurality of the piezoelectric cantilever beams and the mass block are arrange in the round frame, the plurality of the piezoelectric cantilever beams are embedded in the PDMS film in a radial direction, one end of each piezoelectric cantilever beam is fixed on the round frame and the other end thereof is suspended; and the mass block is embedded in the PDMS film and is arranged at the center of the round frame. The invention causes piezoelectric transducing elements toobtain a larger output power under the environment of low-frequency vibration, thereby solving the problem of narrow working band of the traditional MEMS piezoelectric energy collector.

The invention discloses an active ring resonator-based single longitudinal mode low noise narrow band column vector fiber laser. The single longitudinal mode low noise narrow band column vector fiber laser comprises a pumping source, a wavelength division multiplexer, a gain fiber, an isolator, a coupler, a seed source, a first optical circulator, a second optical circulator, a single-mode fiber, a few-mode fiber engraved with a grating, a first polarization controller and a second polarization controller which are connected with one another in a closed end-to-end manner through a fiber coupling way to form a ring optical fiber resonator. The components of the single longitudinal mode low noise narrow band column vector fiber laser adopts an all-fiber coupling mode; the structure is compact, the polarization purity of output column vector laser is high, the coherence is well, a single longitudinal mode working manner is realized, and the spectrum stability is high.

An optical amplifier system comprises an optical gain medium receiving an input optical signal and outputting an amplified optical signal and a pump laser optically coupled to an input of the optical gain medium, wherein the pump laser emits a series of pulses to the optical gain medium, the pulses being emitted during coherence collapse operation of the pump laser, the time between pulses being shorter than an excited state lifetime of the optical gain medium.

A light source mode alignment device and method and a passive optical network system are provided. The device includes a laser and a temperature control unit connected to each other and further includes a signal processing unit. The laser converts an incident light into a current signal. The current signal is amplified and converted into a voltage signal via a transimpedance amplifier. Together with a modulation signal generated by the signal processing unit, the voltage signal adjusts a bias voltage of the temperature control unit.

The invention relates to a vertical axis wind turbine with multilayer wind wheels. The wind turbine comprises at least two wind wheels with the same structure, wherein each wind wheel comprises a rotating shaft (1), a blade (2), a bracket (3) and a bracket (4); one bracket (3) and one bracket (4) are fixedly connected between each blade (2) and each rotating shaft (1), and the bracket (3) is parallel to the bracket (4); the rotating shafts (1) of the wind wheels overlap and the at least two wind wheels with the same structure are laminated in the direction of the overlapped rotating shafts (1); each bracket (4) of the upper layer of wind wheels passes through the overlapped rotating shafts (1) and respectively overlaps with one bracket (3) of the lower layer of wind wheels, so that the upper layer of wind wheels and the lower layer of wind wheels are staggered on the overlapped rotating shafts (1); and the lower end of the overlapped rotating shafts (1) is connected with a transmission shaft of a generator or wind-driven water pump. The torque ripple of the vertical axis wind turbine is gentler, stable power output is facilitated and the fatigue degree of a transmission system is reduced.