43results about How to "Good self-starting" patented technology

The invention discloses a starting device for a vertical axis wind turbine (VAWT). The device comprises a wind wheel main shaft and a wind wheel, wherein turbine blades are fixedly connected with the outer ends of blade support plates; when the turbine blades rotate, the inner ends of the blade support plates transmit torque to the wind wheel main shaft, and the wind wheel main shaft is driven to rotate; the inner ends of the blade support plates are fixed on a hollow sleeve bearing seat; the hollow sleeve bearing seat is arranged on the wind wheel main shaft through bearings; a wind speed adaptive clutch controls the hollow sleeve bearing seat to transmit power to the wind wheel main shaft; a driving part of the wind speed adaptive clutch is fixedly connected with the hollow sleeve bearing seat, and a driven part of the wind speed adaptive clutch synchronously rotates with the wind wheel main shaft and can move along the axial direction of the wind wheel main shaft, so that the driving part and the driven part of the wind speed adaptive clutch are engaged and disengaged; and when the driving part and the driven part are combined and synchronously rotate, the torque is transmitted to the wind wheel main shaft, a turbine main shaft is driven to rotate, and the VAWT is started. By the device, wind power utilization efficiency is improved, and the self-starting performance of the VAWT is optimized.

The invention relates to a vertical shaft tidal current energy power generating device and an application thereof. The vertical shaft tidal current energy power generating device comprises a first base, a second base, a power generator, an upper impeller and a lower impeller; the power generator comprises a rotor and a stator; the rotor is assembled to a first rotating shaft; one end of the first rotating shaft is connected with the power generator and the other end of the rotating shaft is connected with the upper impeller; the other end of the upper impeller is connected with the first base through a connecting device; the lower end of the power generator is connected with a second rotating shaft; one end of the second rotating shaft is connected with the stator and the other end is connected with the lower impeller; the upper impeller and the lower impeller are SAVONIUS type blades; the blades comprise concave surface blades and convex surface blades; an overlap ratio S / D of the concave surface blades and the convex surface blades is 0.2. The vertical shaft tidal current energy power generating device has the advantages of being good in self-starting performance, improving the device stability and the working condition of the connecting device; improving the power generation efficiency and saving complex mechanical component such as a gear transmission mechanism.

The invention provides a connecting rod transmitting folding blade vertical shaft impeller. A main shaft is arranged on a bearing base, blade supports are respectively and fixedly arranged at the upper end and the lower end of the main shaft, four blade units are respectively located between the upper blade support and the lower blade support, rotating shafts of all blades are respectively provided with gear units, the two groups of symmetrical blades can rotate synchronously through two connecting rod transmitting mechanisms which connect the two groups of symmetrical blades, and when one group of blades gradually closes, the other group of blades gradually open. The impeller blades rotate around the shaft and can change the positions of the blades, so that the blades can be unfolded as a plane board when facing the wind, the wind facing area is increased, the received rotating torque is improved, the blades can be folded and form NACA wing type blades when facing against the wind, the wind against resistance is reduced, so that the impeller blades have good self-starting performance, the energy catching efficiency can be further improved, and the connecting rod transmitting folding blade vertical shaft impeller has a higher power generating efficiency.

In a laser (12, 18) with a laser resonator (13), the laser resonator (13) has a non-linear optical loop mirror (1, 1′), NOLM, which is adapted to guide counter-propagating portions of laser pulses, and to bring the counter-propagating portions of laser pulses into interference with each other at an exit point (4) of the NOLM (1, 1′). The non-linear optical loop mirror (1, 1′) contains a non-reciprocal optical element (7, 7′) on a linear section of the NOLM. In addition to the NOLM, the laser resonator (13) has a linear cavity section. The linear section of the NOLM and the linear cavity section (19) are reassembled on a microoptical bench (112) or within a cylindrical carrier (112).

The invention discloses a fishtail type tidal current energy generating set which solves the problem that an existing tidal current energy generating set cannot be effectively suitable for a near-shore shallow-water sea area, and has the advantages of being great in swept area and high in power generating efficiency. According to the technical scheme adopted by the invention, the fishtail type tidal current energy generating set comprises a first swing energy absorbing mechanism and a second swing energy absorbing mechanism, wherein the first swing energy absorbing mechanism comprises a firstcross arm; the end part of the first cross arm is hinged with a first water wing; the first cross arm is connected with a first hydraulic pump and a first gas pump; the second swing energy absorbing mechanism comprises a second cross arm; the end part of the second cross arm is hinged with a second water wing; the second cross arm is connected with a second hydraulic pump and a second gas pump; the first hydraulic pump is connected with a second hydraulic motor; a second hydraulic motor is connected with the second water wing; the second hydraulic motor drives the second water wing to swing along a hinged part with the second cross arm; the second hydraulic pump is connected with the first hydraulic motor; the first hydraulic motor is connected with the first water wing; and the first hydraulic motor drives the first water wing to swing along a hinged part with the first cross arm.

The present invention provides a Mamyshev type laser oscillator with nonlinear loop filtering. The Mamyshev type laser oscillator comprises a first nonlinear optical loop lens comprising a first coupler, a first optical amplifier, a first filter and a first phase shifter, a second nonlinear optical loop lens comprising a second coupler, a second optical amplifier, a second filter and a second phase shifter, and a broadening amplifier comprising a third optical amplifier and a fourth optical amplifier, wherein the central wavelength of the second filter is different from that of the first filter, an input end of the third optical amplifier is connected to an output port of the first nonlinear optical loop lens, an output end of the third optical amplifier is connected to an input port of the second nonlinear optical loop lens, an input end of the fourth optical amplifier is connected to an output port of the second nonlinear optical loop lens, and an output end of the fourth optical amplifier is connected to an input port of the first nonlinear optical loop lens. Pulse laser is continuously amplified, broadened, narrowed, and reshaped in the Mamyshev type laser oscillator until a stable pulse sequence is formed, and so the self-starting performance of the Mamyshev type laser oscillator is good.

The invention relates to an impeller of a foldable-blade vertical shaft based on belt drive. The impeller of the foldable-blade vertical shaft based on the belt drive comprises a bearing base, a spindle, an upper blade bracket, a lower blade bracket, four groups of gear sets, four groups of stop rods, four outer blades, four inner blades and two belt drive sets. The blades of the impeller are regularly rotated while revolved around an axis, the positions of the blades are changed so that the blades are expanded as the plate in the windward direction, the windward area is increased, and the received driving torque is improved; and the blades are folded against the wind, the headwind resistance is reduced, so the impeller of a blower has better self-startability, and higher generating efficiency.

The invention provides an attack angle variation method for an H-shaped vertical-axis wind turbine. The attack angle variation method comprises the following steps that (1) the theoretical optimum attack angles of an upper wind area and a lower wind area are determined; (2) the operation relations of the induced velocities and the inducing factors of the upper wind area and the lower wind area are obtained; (3) the adjusting law of the mounting angle of blades of the upper wind area is determined; (4) the adjusting law of the mounting angle of blades of the lower wind area is determined; and (5) according to the adjusting laws of the mounting angles of the blades of the upper wind area and the lower wind area, the mounting angle of the H-shaped vertical-axis wind turbine is adjusted in real time. The invention further provides an attack angle real-time adjusting device of the H-shaped vertical-axis wind turbine. By using the attack angle variation method for the H-shaped vertical-axis wind turbine, the blade attack angle is adjusted in real time, so that the attack angles of all positions of the blades in the rotating process are closest to the optimum attack angles, and the purpose that the wind energy utilization ratio is increased is achieved accordingly.

The invention discloses a full polarization-maintaining fiber dispersion management ring cavity mode-locking femtosecond ytterbium-doped fiber laser, which is applied to the field of laser, and comprises a double-pigtail fiber collimation semiconductor saturable absorber mirror, a three-port circulator, a gain fiber, a chirped fiber grating, a wavelength division multiplexer and a pumping source. All the devices are welded together through single-mode polarization-maintaining fibers. The full-fiber device forms a laser resonant cavity between the semiconductor saturable absorber mirror and the fiber bragg grating. In order to solve the problems that an existing semiconductor saturable absorber mirror mode-locked linear cavity is prone to forming parasitic oscillation, mode locking in the cavity is unstable, the anti-damage threshold value of a semiconductor saturable absorber mirror is greatly reduced, and the semiconductor saturable absorber mirror is prone to being damaged, an annular cavity structure is adopted, and the laser is high in stability, and the influence of parasitic oscillation generated by back reflection of fiber fusion points and end face reflection of an output port is avoided. Extra-cavity pumping is adopted, and the mode-locked laser is easy to realize high repetition frequency; the mode-locked laser is good in self-starting performance, and wide spectrum output can be obtained.

The invention discloses a single-phase magnetic-flux switching-type variable reluctance motor. The motor comprises: an excitation winding and / or an excitation permanent magnet, a magnetic flux switching salient pole unit, a salient pole stator and a salient pole rotor. The salient pole stator comprises: a magnetic flux switching salient pole unit and a stator yoke. The salient pole rotor comprises three rotor salient poles and rotor yokes which are uniformly distributed as a certain interval and angle. The excitation winding and / or the excitation permanent magnet is fixed on a stator yoke so as to form a single phase excitation source. Therefore, an excitation magnetic flux always forms a closed path through the stator yoke, the magnetic flux switching salient pole unit, an air gap and the salient pole rotor. Through a flexible adjusting effect of the magnetic flux switching salient pole unit to the closed path of the excitation magnetic flux, a motor output torque can do work externally. In the invention, a motor structure is simple. Because there is no the winding or the permanent magnet on the rotor, the motor of the invention simultaneously possesses high reliability and other advantages.

The invention relates to a vertical axis wind power generation impeller comprising flexible blades. The vertical axis wind power generation impeller is mainly formed by a main shaft, an upper support, a lower support, a first baffle plate, a second baffle plate, a third baffle plate, a fourth baffle plate, a first blade, a second blade, a third blade, a fourth blade and a flexible base.

A polarization maintaining optical fiber mode-locked laser is characterized by comprising an optical fiber reflector, a variable optical attenuator, a polarizer, a second input port of a wavelength division multiplexer, an output port of the wavelength division multiplexer, gain optical fibers, an isolator, a filter, an input port of a beam splitter, a first output port of the beam splitter and a saturable absorber mirror, wherein the optical fiber reflector, the variable optical attenuator, the polarizer, the second input port of the wavelength division multiplexer, the output port of the wavelength division multiplexer, the gain optical fibers, the isolator, the filter, the input port of the beam splitter, the first output port of the beam splitter and the saturable absorber mirror are sequentially connected in a fusion welding mode through polarization maintaining optical fibers. A pumping source is connected with a first input port of the wavelength division multiplexer in a fusion welding mode, and a second output port of the beam splitter is a laser output port. According to the polarization maintaining optical fiber mode-locked laser, two mode-locked mechanisms are utilized simultaneously. The polarization maintaining optical fiber mode-locked laser has the advantages that the full polarization maintaining optical fiber structure is provided, high mode-locked self-starting performance is achieved, and high stability and the compact structure are achieved. The polarization maintaining optical fiber mode-locked laser has wide application prospects.

The invention discloses a solar air-conditioning system having charging, control and lightning protection functions. The system comprises a solar cell, a solar controller, a storage battery and a variable frequency air conditioner. The solar controller comprises a charging circuit, a control circuit, a lightning protection circuit and a discharge circuit. The variable frequency air conditioner comprises an inverter circuit. The lightning protection circuit comprises a sixty-first fuse, a sixty-first resistor, a sixty-second resistor, a first piezoresistor, a second piezoresistor, a sixty-first diode, a sixty-second light-emitting diode and a discharge tube. The system can protect lighting effectively, improves system safety performance, can protect activity of the storage battery when charging the storage battery, can prolong the service life of the storage battery, can improve charge efficiency of the storage battery, prolongs power consumption time of the storage battery, has good self-startup capability, prevents an endless-loop state, is simple in circuit structure, is low in cost and can realize a good lightning protection effect.

The invention relates to a multi-winding laminated claw pole motor, which is mainly used for permanent magnet synchronous motor. A coil (1) is wound on a framework (2); a plurality of groups of laminated claw poles (3) are respectively arranged in the framework (2) from two ends; the two groups of laminated end plates (4) are respectively arranged at two ends of the framework (2) to form a single-winding combination (5), the laminated claw poles (3) and the laminated end plates (4) are formed by laminating a plurality of silicon steel sheets, and the motor stator can be formed by coaxially arranging two or three single-winding combinations (5) side by side and staggered at an electromagnetic angle of 90 degrees or 120 degrees in the circumferential direction. Compared with most existing motors, the motor winding processing technology is simplified, the reliability is improved, the copper consumption is reduced, compared with an existing asynchronous motor, the efficiency and the powerfactor are greatly improved, compared with an existing permanent magnet synchronous motor, the rotor structure is simplified, the cost is reduced, the self-starting capacity is good, and a high-powermotor can be manufactured.

The invention discloses a solar air conditioner system having charging, control and H-bridge inversion. The air conditioner system comprises a solar cell, a solar controller, a storage battery and a variable frequency air conditioner, wherein the solar controller comprises a charging circuit, a control circuit, a lightning prevention circuit and a discharging circuit, the variable frequency air conditioner comprises an inversion circuit, the inversion circuit comprises a fiftieth-first IGBT (Insulated Gate Bipolar Transistor) tube, a fiftieth-second IGBT tube, a fiftieth-third MOS (Metal Oxide Semiconductor) tube, a fiftieth-fourth MOS tube, a fiftieth-first diode, a fiftieth-second diode, a fiftieth-third diode, a fiftieth-fourth diode, a fiftieth-first resistor and a fiftieth-second resistor. By the solar air conditioner system, lightning can be effectively prevented, the safety performance of the system is improved, the activity of the storage battery can be ensured as well as the storage battery is charged, the service lifetime of the storage battery can be prolonged, the charging efficiency of the storage battery can be improved, the power utilization time of the storage battery is prolonged, the solar air conditioner system has favorable automatic-starting capability, an infinite loop state is prevented, and relatively high efficiency is achieved no matter whether a load works in a light-load or heavy-load condition.

The invention discloses a solar air conditioner system with a rechargeable function, a control function and an adjustable inversion function. The solar air conditioner comprises a solar battery, a solar controller, a storage battery and a variable-frequency air conditioner. The solar controller comprises a charging circuit, a control circuit, a lightning protection circuit and a discharging circuit. The variable-frequency air conditioner comprises an inverter circuit. The control circuit comprises a thirty-first diode, a thirty-second diode, a thirty-third diode, a thirty-forth voltage stabilizer tube, a thirty-seventh voltage stabilizer tube, a thirty-second resistor, a thirty-first MOS tube and an integrated voltage stabilizer chip. The inverter circuit comprises a fifty-first resistor, a fifth-second resistor, a fifth-third resistor, a fifth-first slide rheostat, a fifth-second slide rheostat, a fifth-first inductor, a fifth-first capacitor, a fifth-second capacitor, a fifth-first triode, a fifth-first transformer and a fifth-second transformer. The solar air conditioner system has advantages of effective lightning prevention, effective system safety performance improvement, high convenience in mounting, relatively low cost, relatively high reliability, relatively high self-starting capability, effective prevention for endless loop state, simple circuit structure and relatively small size.

The invention discloses a solar air conditioner system having functions of charging, control and automatic discharging. The solar air conditioner system comprises a solar cell, a solar controller, a storage battery and a variable frequency air conditioner, wherein the solar controller comprises a charging circuit, a control circuit, a lightning protection circuit and a discharging circuit, the variable frequency air conditioner comprises an inversion circuit and a compressor, the charging circuit comprises an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eleventh capacitor, a twelfth capacitor, a thirteenth metal oxide semiconductor (MOS) transistor and a fourteenth MOS transistor, and the discharging circuit comprises a forty-first switch, a forty-first relay, a forty-first resistor, a forty-second resistor, a forty-third resistor, a forty-fourth resistor, a forty-fifth discharge resistor and a forty-third electrolytic capacitor. By the solar air conditioner system, lightning can be effectively prevented, the safety performance of the system is improved, the activity of the storage battery can also be ensured during charging of the storage battery, the service lifetime of the storage battery can be prolonged, the charging efficiency of the storage battery can be improved, the power utilization time of the storage battery is prolonged, the solar air conditioner system has relatively high self-starting capability, an endless loop state is prevented, the discharge time can be greatly shortened, and the energy consumption of the system is saved.

The invention discloses a starting device for a vertical axis wind turbine (VAWT). The device comprises a wind wheel main shaft and a wind wheel, wherein turbine blades are fixedly connected with the outer ends of blade support plates; when the turbine blades rotate, the inner ends of the blade support plates transmit torque to the wind wheel main shaft, and the wind wheel main shaft is driven to rotate; the inner ends of the blade support plates are fixed on a hollow sleeve bearing seat; the hollow sleeve bearing seat is arranged on the wind wheel main shaft through bearings; a wind speed adaptive clutch controls the hollow sleeve bearing seat to transmit power to the wind wheel main shaft; a driving part of the wind speed adaptive clutch is fixedly connected with the hollow sleeve bearing seat, and a driven part of the wind speed adaptive clutch synchronously rotates with the wind wheel main shaft and can move along the axial direction of the wind wheel main shaft, so that the driving part and the driven part of the wind speed adaptive clutch are engaged and disengaged; and when the driving part and the driven part are combined and synchronously rotate, the torque is transmitted to the wind wheel main shaft, a turbine main shaft is driven to rotate, and the VAWT is started. By the device, wind power utilization efficiency is improved, and the self-starting performance of the VAWT is optimized.

The invention discloses a solar air conditioning system with charging, control and power lightning-protection functions. The system comprises a solar cell, a solar controller, an accumulator and a variable-frequency air conditioner. The solar controller comprises a charging circuit, a control circuit, a lightning protection circuit, and a discharging circuit. The variable-frequency air conditioner comprises an inverter circuit. The lightning protection circuit comprises sixty-first to sixty-second resistors, sixty-first to sixty-third piezoresistors, sixty-first to sixty-fourth fuses, and a gas discharge tube. The solar air conditioning system can be effective in lightning protection and improved in security performance; according to the solar air conditioning system, while the accumulator is charged, the activity of the accumulator can also be ensured, the service life of the accumulator can be prolonged, the charging efficiency of the accumulator can be improved, the power utilization time of the accumulator can be prolonged, the good self-starting capacity is provided, the appearance of an endless loop state is avoided, lightning surges suffered by the air conditioner can be absorbed, and thus the air conditioner is protected against being damaged by lightning surges.

The invention relates to a vertical shaft wind power generation impeller with a belt wheel mechanism. The vertical shaft wind power generation impeller mainly comprises a main shaft, an upper support, a lower support, a first belt wheel mechanism, a second belt wheel mechanism, a first blocking plate, a second blocking plate, a third blocking plate, a fourth blocking plate, a first vane, a second vane, a third vane, a fourth vane and a movable base.

The invention discloses a solar air conditioner control system. The solar air conditioner control system comprises a solar cell, a solar controller, a storage battery and a variable frequency air conditioner, wherein the solar controller comprises a charging circuit, a control circuit, a lightning prevention circuit and a discharging circuit, the variable frequency air conditioner comprises an inversion circuit and a compressor, the charging circuit comprises an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eleventh capacitor, a twelfth capacitor, an eleventh voltage stabilization tube, an eleventh triode, a twelfth triode, a thirteenth MOS (Metal Oxide Semiconductor) tube and a fourteenth MOS tube, and the control circuit comprises a thirty-first diode, a thirty-second diode, a thirty-third diode, a thirty-fourth voltage stabilization tube, a thirty-seventh voltage stabilization tube, a thirty-second resistor, a thirty-first MOS tube and an integrated voltage stabilization chip. By the solar air conditioner control system, lightning can be effectively prevented, the safety performance of the system is improved, the activity of the storage battery can be ensured as well as the storage battery is charged, the service lifetime of the storage battery can be prolonged, the charging efficiency of the storage battery can be improved, the power utilization time of the storage battery is prolonged, the solar air conditioner control system has favorable automatic-starting capability, and an infinite loop state is prevented.

The invention discloses a bottom-supported horizontal axis tidal current energy power generation principle and device achieving automatically sensing of a flow direction, and belongs to the technicalfield of tidal current energy power generation. The device comprises a mounting base, the mounting base of the device is fixed to a sea floor, a horn-shaped diversion hood is fixed to the mounting base and internally provided with a water turbine, the rear end of the water turbine is connected to an engine room, universal couplers are connected with the upper and lower surfaces of the horn-shapeddiversion hood respectively and connected to the mounting base through connecting shafts respectively, and a flow velocity flow direction sensor is also connected between the universal coupler connected with the upper surface of the horn-shaped diversion hood and the corresponding connecting shaft. The device can automatically adapt to the change of the flow direction of tidal current, the utilization rate of the tidal current is high, the horn-shaped diversion hood which has the function of guiding the flow and can increase the flow velocity of the tidal current is arranged, and the device ishigh in reliability, high in work efficiency and great in power generation benefits.

The invention provides an attack angle variation method for an H-shaped vertical-axis wind turbine. The attack angle variation method comprises the following steps that (1) the theoretical optimum attack angles of an upper wind area and a lower wind area are determined; (2) the operation relations of the induced velocities and the inducing factors of the upper wind area and the lower wind area are obtained; (3) the adjusting law of the mounting angle of blades of the upper wind area is determined; (4) the adjusting law of the mounting angle of blades of the lower wind area is determined; and (5) according to the adjusting laws of the mounting angles of the blades of the upper wind area and the lower wind area, the mounting angle of the H-shaped vertical-axis wind turbine is adjusted in real time. The invention further provides an attack angle real-time adjusting device of the H-shaped vertical-axis wind turbine. By using the attack angle variation method for the H-shaped vertical-axis wind turbine, the blade attack angle is adjusted in real time, so that the attack angles of all positions of the blades in the rotating process are closest to the optimum attack angles, and the purpose that the wind energy utilization ratio is increased is achieved accordingly.

The invention discloses a blade distance adjusting mechanism of a horizontal-axis wind turbine. The blade distance adjusting mechanism of the horizontal-axis wind turbine comprises a vertical shaft, three stepping motors, a traction mechanism portion and a distance changing mechanism portion, wherein the vertical shaft is arranged perpendicularly; the three stepping motors are arranged on the vertical shaft; output shafts of the three stepping motors are respectively connected with a worm gear and worm mechanism; the traction mechanism portion comprises a traction parallel mechanism consisting of three traction branched chains; each traction branched chain comprises a driving rod and a traction parallelogram structure; the distance changing mechanism portion comprises a distance changing parallel mechanism consisting of a plurality of distance changing branched chains; and the number of the distance changing branched chains is the same with that of blades. By the parallel mechanisms, an eccentric plate can move in three-dimensional space in a translational manner. The blade distance adjusting mechanism is high in rigidity, high in carrying capacity and high in distance adjusting precision.

The invention discloses a solar air-conditioning system having charging, controlling and H-bridge inversion functions. The solar air-conditioning system is composed of a solar battery, a solar controller, a storage battery, and a variable-frequency air conditioner. The solar controller consists of a charging circuit, a control circuit, a lightning prevention circuit, and a discharging circuit. The variable-frequency air conditioner includes an inverter circuit. The control circuit consists of a thirty-first diode, a thirty-second diode, a thirty-third diode, a thirty-fourth voltage-regulator tube, a thirty-seventh voltage-regulator tube, a thirty-second resistor, a thirty-first MOS tube, and an integrated voltage-regulating chip. The inverter circuit includes a fifty-first IGBT tube, a fifty-second IGBT tube, a fifty-third MOS tube, a fifty-fourth MOS tube, a fifty-first diode, a fifty-second diode, a fifty-third diode, a fifty-fourth diode, a fifty-first resistor, and a fifty-second resistor. According to the invention, a lightning prevention effect is good; the system security is improved; the system having low cost and high reliability can be installed conveniently; the system has the excellent self-starting capability; an endless loop state is avoided; and no matter whether the load is in an under-loading working state or a full-load working sate, the efficiency is high.

The present invention provides a Mamyshev type laser oscillator with nonlinear loop filtering. The Mamyshev type laser oscillator comprises a first nonlinear optical loop lens comprising a first coupler, a first optical amplifier, a first filter and a first phase shifter, a second nonlinear optical loop lens comprising a second coupler, a second optical amplifier, a second filter and a second phase shifter, and a broadening amplifier comprising a third optical amplifier and a fourth optical amplifier, wherein the central wavelength of the second filter is different from that of the first filter, an input end of the third optical amplifier is connected to an output port of the first nonlinear optical loop lens, an output end of the third optical amplifier is connected to an input port of the second nonlinear optical loop lens, an input end of the fourth optical amplifier is connected to an output port of the second nonlinear optical loop lens, and an output end of the fourth optical amplifier is connected to an input port of the first nonlinear optical loop lens. Pulse laser is continuously amplified, broadened, narrowed, and reshaped in the Mamyshev type laser oscillator until a stable pulse sequence is formed, and so the self-starting performance of the Mamyshev type laser oscillator is good.

The invention discloses a solar air-conditioning system with control and power lightning protection functions. The solar air-conditioning system comprises a solar battery, a solar controller, a storage battery and a variable-frequency air conditioner, wherein the solar controller comprises a charging circuit, a control circuit, a lightning protection circuit and a discharge circuit; the variable-frequency air conditioner comprises an inverter circuit; the control circuit comprises a 31st diode, a 32nd diode, a 33rd diode, a 34th voltage-regulator tube, a 37th voltage-regulator tube, a 32nd resistor, a 31st MOS tube and an integrated voltage stabilizing chip; and the lightning protection circuit comprises a 61st resistor, a 62nd resistor, a 61st piezoresistor, a 62nd piezoresistor, a 63rd piezoresistor, a 61st fuse, a 62nd fuse, a 63rd fuse, a 64th fuse and a gas discharge tube. By the solar air-conditioning system, a thunder can be effectively prevented, the safety performance of the system is improved, the solar air-conditioning system has relatively good self-startup ability, an endless loop state is avoided, a lightning surge on an air conditioner can be absorbed, and the air conditioner is prevented from being damaged by the lightning surge.

The invention discloses a solar air conditioner control system having charge, discharge and control functions. The solar air conditioner control system comprises a solar cell, a solar controller, a storage cell and a variable frequency air conditioner, wherein the solar controller comprises a charging circuit, a control circuit, a lightning protection circuit and a discharging circuit; the variable frequency air conditioner comprises an inverter circuit and a compressor; the control circuit comprises thirty-first to thirty-third diodes, a thirty-fourth voltage stabilizing tube, a thirty-seventh voltage stabilizing tube, a thirty-second resistor, a thirty-first MOS transistor and an integrated voltage stabilizing chip; the discharging circuit comprises forty-first to forty-second triodes, forty-first to forty-six resistors, a forty-first capacitor and a forty-second capacitor. Via use of the solar air conditioner control system, effective lightning protection can be realized, system safety performance can be improved, endless loop states can be prevented, loss can be lowered and discharge time can be reduced; the solar air conditioner control system which is convenient to install is low in cost, high in reliability and good in self-starting capability.

The invention discloses a 2 [mu] m mode-locked fiber laser based on an SMF-SIMF-GIMF-SMF fiber structure. The laser is of an annular cavity structure and comprises a pumping source, a wavelength division multiplexer, a gain fiber, a non-polarization-maintaining isolator and a polarization controller, an all-fiber saturable absorption device serving as a mode locking device and a coupler serving as an output; the all-fiber saturable absorption device is composed of an input single-mode fiber, a step multimode fiber, a gradient multimode fiber and an output single-mode fiber. The laser mode locking mechanism disclosed by the invention adopts the nonlinear multimode interference effect in the multimode fiber, has the advantages of all-fiber structure, high damage threshold, self starting of model locking, high stability and compact structure, and has a wide application prospect.