67results about How to "Small ripple factor" patented technology

The invention discloses a control method for a three-phase PWM rectifier suitable for power grid waveform distortion. The control method for the three-phase PWM rectifier suitable for the power grid waveform distortion mainly includes that extracting a current reference signal under input voltage distortion and unbalanced disturbance, and actively injecting negative-sequence current, improved dead-beat inner current loop which is forecast through combining with linear extrapolation, and outer direct voltage loop performed with active disturbance rejection control. The control method for the three-phase PWM rectifier suitable for the power grid waveform distortion plays roles of inhibiting the harmonic wave of the input current of the PWM rectifier, injecting proper negative-sequence current to eliminate the secondary power pulse of the output direct current voltage of the PWM rectifier, improving the transient response of the output direct current voltage, and compensating the influences of all kinds of delay on the dead-beat control. The control method for the three-phase PWM rectifier suitable for the power grid waveform distortion is capable of obviously reducing the secondary wave of the output direct current voltage under the disturbance of the input harmonic wave and unbalanced voltage, improving the transient response speed of the PWM rectifier, reducing the transient offset of the direct current voltage, and improving the system control precision.

The invention relates to a computer control system for a novel direct drive lockstitch sewing machine. The computer control system comprises a master controller, a pedal speed regulator, an operation panel, solenoid valves, a power supply module, a motor, a motor drive controller and a photocoupling isolation module. The computer control system is characterized in that the master controller consists of a microprocessor CPU, a communication module, a driving module for the solenoid valves, a speed control module and a current control module; the microprocessor CPU realizes bi-directional data communication with the operation panel by a communication module circuit, realizes control and protection over actions of the solenoid valves of the sewing machine by a solenoid valve drive circuit, and realizes variable frequency control over the motor by the speed control module and the current control module; the master controller is respectively connected with the pedal speed regulator, the operation panel, the solenoid valves and the photocoupling isolation module; and the motor drive controller consists of a special servo drive module and a current detection module.

The invention discloses method for compensating broadband continuous dispersion by using two-cascaded identical chatter long period optical fiber grating (CLPG) in super length. The invention also discloses system and method for fabricating CLPG designed based on the said compensation method. Combining device for drawing in and releasing optical fiber with accurate shifter in fabricating system controls following operations: moving optical fiber in write procedure; drawing in and releasing optical fiber synchronistically; writing in super length; drawing in written CLPG. Tensile adjustment makes writing procedure possess high repeatability and stable. Through adjustment of optical fiber, laser from CO2 laser device focused on optical fiber is written into CLPG. Features are: wide bandwidth, large compensation quantity of dispersion, small ripple and loss, weak nonlinearity, and low cost.

The invention discloses a control method of an accelerating high-voltage power for an electron-beam punching machine and a power device thereof. The power is supplied by three-phase commercial electricity and adopts the current conversion mode of AC-DC-AC-DC, wherein, the middle inverter link of DC-AC is high-frequency inversion and the pulse-width modulation voltage regulation function can be realized in the inversion process; a dual closed-loop control mode is adopted to realize the stable regulation of the output high-voltage; an inverter consists of at least two inverter bridges, the phase difference of the output wave of each inverter bridge is distributed symmetrically, and the output wave has the same width. The power device comprises: a power network filter, an input rectifier filter circuit, the inverter, a high-frequency and high-voltage transformer, a high-voltage rectifier filter circuit, a high-voltage discharge choke circuit, a high-voltage sampling circuit, an electronic beam sampling resistor, an inverter input current detection circuit, a dual-loop control unit, an inverter drive circuit, a fault discrimination circuit and the like. The control method and the power device are characterized by the control system with high regulation speed, strong immunity, small accelerating high-voltage power ripple, high efficiency and small size and the like.

A three-phase double convex pole permanent magnet brushless generator is in the structure of a stator inside and a rotor outside, the magnet and an armature winding are set on the stator fixed on the base by four installing holes, the rotor is connected with the shaft by the shell and a shaft sleeve base, four magnets are distributed uniformly along the circum at the yoke of the stator, the poles of which are distributed in N,S,S,N,N,S,S,N, 12 convex poles are uniformly distributed on the outer circum of the stator, 8 convex poles are uniformly distributed on the inner circum of the rotor and placed on the two face to face poles of the stator and two face to face vertical poles connected with them and the centralized windings of the four poles are serial to one three-phase armature winding in 120deg. difference.

The invention is a control method and a power device used in a process that an electron beam bombards furnace electron beam to produce system power. The method is able to speed up a power open-loop control, and is able to speed up a power pressure and electron beam current sampling signal as a control signal of bombardment power supply, filament power supply and electron beam power, and the electron beam power is steady and easy of being adjusted under a coordinated operation of the three powers. A harmonic is small and has a rather small effect on an electric fence, and power factors and efficiency of the equipment are rather high, and the operation is reliable. A main transformer of an accelerator power supply in the power device is side-connected with three-phase voltage once, and an output terminal is connected with an accelerating voltage bleeder circuit and an electron beam current sampling resistance to output sampling signals. The accelerator power supply further is connected with a thyristor device and a trigger circuit, a soft start controlling circuit, a fault-detecting protection controlling circuit etc. The bombardment power supply comprises a PWM, a bombardment inverter, a bombardment transformer and a bombardment power supply adjustor etc. The filament power supply and the beam power controlling circuit are composed of the PWM, a filament inverter, a filament transformer, a bean power setting potentiometer, a multiplier, a beam power adjustor, a filament power supply adjustor etc.

The invention discloses a high-frequency high-voltage switching power supply device for an industrial X-ray flaw detector. A control mode with a dual-high-frequency contravariant structure and amplitude adjusting as well as high-frequency lamp filaments is adopted, and a voltage controlled oscillator and drive circuits are used, so that a switching power supply can resist the interference of a power grid, and the stability of a DC (direct current) voltage is improved; the input of a voltage loop is controlled by adopting an amplitude adjusting mode, so that the voltage waveform of a voltage doubling circuit is more stable and is undistorted, and the circuit reliability is improved. The voltage is controlled by a dual-contravariant loop of AC (alternating current)-DC (direct current) and DC-AC, and a high-frequency full-bridge closed loop contravariant circuit is adopted for AC-DC, so that the output DC voltage is stable, and not influenced by the power grid, and finally stable direct current voltage is provided for a DC-AC closed loop circuit contravariant circuit. The input voltage of the whole device is adjusted through adjusting the output voltage of AC-DC, so that the device has the capability for resisting the oscillation of the power grid; a high-frequency dual-closed-loop lamp filament loop is adopted, and for the withstand voltage problem of a lamp filament transformer, a multi-stage transformer is adopted for coupling, so that the withstand voltage of each stage is reduced.

The invention relates to the light-emitting diode (LED) manufacturing field and provides a LED driving power supply. The LED driving power supply comprises a power input end, an electro magnetic compatibility (EMC) circuit, a rectifying circuit, a voltage conditioning circuit, a filtering circuit, an output current voltage detecting circuit and an LED lamp at the output end of the output current voltage detecting circuit, and further comprises a constant current and constant voltage controlling circuit, wherein the power input end, the EMC circuit, the rectifying circuit, the voltage conditioning circuit, the filtering circuit, the output current voltage detecting circuit and the LED lamp are connected in sequence, the constant current and constant voltage controlling circuit is connected with an output end of the output current voltage detecting circuit and an input end of the voltage conditioning circuit, an inductance and a piezoresistor are arranged between the rectifying circuit and the voltage conditioning circuit, the inductance is connected with the rectifying circuit and the voltage conditioning circuit in series, the piezoresistor is connected with the rectifying circuit and the voltage conditioning circuit in parallel, and the input end of the piezoresistor is connected with the output end of the inductance. The LED driving power supply has the advantages that elements with big sizes, high failure rates and high prices are greatly reduced, the structure is simple and reasonable, the cost is lowered and application is stable and reliable. The inductance is added between the rectifying circuit and the voltage conditioning circuit, so that undesirable effects due to the fact that different-mode signals transit to a power grid are restrained, meanwhile the piezoresistor is added, and thereby the ability of the power supply to reject outside surge is improved.

The invention relates to a direct current switch power supply, in particular relates to a continuous adjustable power supply with a variable structure and constant power, comprising a full-bridge direct current converter and a high-frequency transformer, wherein a primary side of the high-frequency transformer is connected on the full-bridge direct current converter, a secondary side of the high-frequency transformer comprises two groups of diode rectification bridges, two filtering inductors with equal inductance values and one output filtering capacitor, and a control switch and two bypath diodes are connected between each filtering capacitor and the filtering capacitor. According to the continuous adjustable power supply with the variable structure and the constant power, disclosed by the invention, serial-connection operation during high-voltage output is realized, parallel-connection operation during high-current output is realized, and the adjusting range of output voltage can be enlarged; and therefore, a good stable state and dynamic properties are realized, and a constant-power output function is realized; and the excellent voltage regulating rate and the excellent load regulating rate are realized, the output voltage ripple coefficient is relative small, and the relative high efficiency is realized within a full output voltage range.

The invention discloses a numerical control driving power supply for an intermediate infrared ultrafast laser, and relates to the technical field of electronic equipment. The power supply comprises apower supply module, a control module, a constant current module, a voltage stabilization feedback module, a protection module, an intelligent diagnosis module and a man-machine interaction module. Inthe laser driving power supply, an electric driving characteristic of an adjustable voltage stabilizing module, a high-speed processing characteristic of the FPGA and reading of voltage ripple coefficient of an oscilloscope are used to form a closed-loop feedback system; and an artificial intelligence algorithm is utilized to quickly process and optimize the electric signal, so that the low ripple characteristic for the mid-infrared ultrafast laser driving power supply is further realized, and the output ripple coefficient is lower than one percent. The numerical control driving power supplymainly solves the fundamental problem of optical time domain and frequency domain jitter of the laser from the aspect of the driving power supply, and plays an important role in improving the opticalquality of an ultrafast laser, a super-continuum spectrum light source and an optical frequency comb and in the aspects of precision machining, laser medical treatment, precision measurement and the like.

The invention provides a high-voltage double-pulse superposed power supply for an electrostatic dust collector. The high-voltage double-pulse superposed power supply for the electrostatic dust collector adopts three-phase input, and adopts a series resonant mode through a resonant circuit to realize zero current shutdowns; and the highest output pulse frequency is designed to be 40KHZ. The high-voltage double-pulse superposed power supply for the electrostatic dust collector effectively solves the problem of insufficient power of the high-frequency pulse power supply in the prior art, and hasthe advantages of the high-frequency pulse power supply of three-phase balance, small ripple factor, high flashover voltage and constant current characteristics; the generation of anti-corona can be avoided for high specific resistance dust; and meanwhile, the double pulse is superposed, therefore, the ultra-fine dust collection is improved, and the dust removal efficiency and power application range are improved.

The invention relates to a height measurement device and method based on an unmanned aerial vehicle. The device comprises a first processor, an ultrasonic ranging module, a voice alarm module and a voltage-stabilized power supply module, wherein the ultrasonic ranging module, the voice alarm module and the voltage-stabilized power supply module are electrically connected with the first processor.Through the height measurement device comprising the first processor, the ultrasonic ranging module, the voice alarm module and the voltage-stabilized power supply module, the structure is simple, themeasured distance is far, and operation is stable; moreover, since the ultrasonic technology is utilized to detect a height distance, the device has the characteristics that frequency is high, wavelength is short, the diffraction phenomenon is small, and particularly the directionality is good and rays can be formed and propagated in a fixed direction; and through the method, flight height can bedetected in real time during flight of the unmanned aerial vehicle, a voice alarm can be given when the flight height of the unmanned aerial vehicle is excessively high or excessively low or the height change rate is abnormal, and therefore the flight safety of the unmanned aerial vehicle is effectively guaranteed.

The invention relates to a double-line pilot frequency power supply of a gas discharge lamp, which supplies power for a lamp tube by the parallel of power frequency large current power supply and high frequency low current power supply which are composed of a power factor compensation capacitor C1, a rectifying inducer E, a filter capacitor C2 and a high-frequency electric source generation circuit F; because the rectifying inducer E does not need to supply starting excitation high voltage to the tube, a pure inductance rectifier can be selected, when the tube normally lights, the work pressure is close to mains voltage, thereby improving the use ratio of the electric energy. When the tube is started and normally lights, the power of the high-frequency electric source generation circuit F is smaller than 50W, the frequency is designed into 2.5MHz-3MHz, thereby being more benefit to excite free electrons in the tube and having good effect on improving the lighting effect and protecting the guard electrode. The output power of the whole circuit is controlled by inducers L1 and L2. The symmetrical design aims to reduce the electromagnetic interference.

The switching power supply of the phase shifting fully controlled inverter bridge based on UC3875 is composed of a main circuit, an overvoltage protection circuit, an overcurrent protection circuit and an adjustable link. The main circuit is composed of an EMI filter and a phase shifting control ZVS-PWM- Composed of DC/DC full-bridge converters, the overvoltage protection circuit is composed of NE555; once the overcurrent protection circuit is overcurrent, the comparator outputs a high level, UC3875 locks and trips, and the power supply stops working. Based on UC3875 phase-shift full-control inverter bridge switching power supply, ZVS phase-controlled PWM mode has small switching loss, low switching strength, high electrical efficiency, good controllability, stability and reliability, high control precision, and small ripple coefficient and many other advantages.

The invention relates to a printed circuit board-based power converter, which comprises a shell and a printed circuit board, wherein the printed circuit board is fixed in the shell; the printed circuit board is provided with a power connecting base, at least one power interface and at least one USB interface; the power connecting base is connected with an external power supply through a power line; power conversion circuits are distributed on the printed circuit board; each power interface is connected with the power conversion circuits; and each power conversion circuit comprises an overload protection circuit, an over-temperature protection circuit and a USB charging circuit. According to the printed circuit board-based power converter, a plurality of circuits are integrated on the printed circuit board, so that the integration level is high, the scheme is flexible and the process is simple. In addition, a direct-current low voltage power supply electronic product can also be charged through the USB interface besides that a household appliance is supplied with a voltage by a normal power interface. The printed circuit board-based power converter is reliable in quality, small in size and intelligent, environment-friendly, efficient and energy-saving in use.

The invention discloses an LED (Light Emitting Diode) driving circuit based on power tube safety protection. The circuit comprises a ripple wave inhibition module, a voltage and current conversion module and a control module, wherein the input end of the ripple wave inhibition module and one end of the control module are connected with the bus of a power distribution device; the ripple wave inhibition module is connected with a load in parallel; the voltage and current conversion module comprises an amplifier, a power tube and a sampling resistor, wherein the output end of the amplifier is connected with the grid electrode of the power tube; the output end of the ripple wave inhibition module is connected with the drain electrode of the power tube; the source electrode of the power tube issubjected to ground connection through the sampling resistor; the drain electrode and the source electrode of the power tube, the same-phase input end of the amplifier and/ or the reverse phase inputend of the amplifier are independently connected with the control module; and the control module enables current which flows through the power tube to be lowered along with the rise of bus voltage. The control module is designed in the LED driving circuit, so that current which flows through the drain electrode lowers when power tube drain electrode voltage in the voltage and current conversion module rises so as to guarantee the safe working area of the power tube.

The invention discloses a control device of an outdoor lamp used in a cold region and belongs to the application field of electronic lighting technologies. The control device of the outdoor lamp used in the cold region mainly comprises the mains supply input end, an intelligent controller, a power supply device and a power supply cavity, wherein the intelligent controller and the power supply device are arranged in the power supply cavity. The control device is characterized by further comprising a heating device arranged in the power supply cavity, wherein the heating device comprises a ceramic heating plate and a thermoswitch device, wherein the ceramic heating plate is connected with the thermoswitch device in series and then connected between the mains supply input end and the intelligent controller and is in parallel connection with the intelligent controller. The control device can enable the outdoor lamp to be switched on in the cold region with the temperature lower than -20 DEG C, meanwhile improves the efficiency, reduces ripple factors and ensures the authenticity of data acquired by a management center, the cost of the control device is greatly reduced compared with the cost of a tantalum capacitor, and accordingly the cost of the whole lamp is reduced.

The invention discloses a transformer substation inspection robot, a wireless charging room, a wireless charging system and a wireless charging method. The system comprises the wireless charging roomand the inspection robot, and transmitting coils are installed on the two side faces of the wireless charging chamber and the ground. The inspection robot comprises a robot body and receiving coils which are also installed on the two sides and the bottom of the robot body. When the electric quantity of the inspection robot is insufficient, the inspection robot can be driven to the vicinity of thewireless charging room through a GPS module, and then the inspection robot accurately enters the wireless charging room through the assistance of a visual identification module, and when it is detected that the transmitting coils and the receiving coils are aligned, the driving is stopped, the wireless charging is started, and the stable charging under the offset condition is achieved. As the three receiving coils are adopted to supply power to the energy storage module together, the high-power wireless charging of the inspection robot under the condition of limited voltage can be realized, and the wireless charging speed and effect of the transformer substation inspection robot are improved.

The invention discloses a voltage-stabilizing circuit by adopting LCpi-type filter and using a bridge rectifier circuit for rectifier, which comprises the bridge rectifier circuit, a filter circuit and a voltage-stabilizing system with a controllable precise voltage-stabilizing function, wherein the bridge rectifier circuit is internally provided with a diode D2, a diode D3, a diode D4 and a diode D5; the filter circuit comprises a capacitor C3, a capacitor C4 and an inductor L, the first end of the capacitor C4 is connected with the negative electrode of the diode D3 and the first end of the inductor L, the second end of the capacitor C4 is connected with the positive electrode of the diode D2 and the second end of the capacitor C3, the second end of the inductor L is connected with the first end of the capacitor C3, and the capacitor C3 is in parallel connection with the input end of the voltage-stabilizing system. Deficiencies that when bridge rectifier is adopted in the prior art, a single capacitor is adopted for filter after rectifier output, ripple voltage is excessively large and too much, and the subsequent circuit is influenced are solved; and the LCpi-type filter is used for head filter processing after rectifier output, and the ripple factor can be effectively reduced.