761 results about "Dsp controller" patented technology

The invention provides an intelligent controller used for a direct current (DC) frequency-conversion air conditioner compressor and a technical proposal of the control method thereof; the hardware proposal comprises a rectifier filter circuit and a power module which are electrically connected sequentially; the rectifier filter circuit (220) is also electrically connected with a single DSP controller used as a core processing unit by a switch power supply (240); the single DSP controller is also respectively and electrically connected with the power module, a communication isolation circuit which is used for communicating with the indoor machine of the air conditioner, a fan driving circuit (280), and a temperature sampling circuit (270); the control method comprises the steps as follows:the control software is embedded in the DSP controller; by a control type of dual close-ring FOC no-sensor magnetic field vector, the current ring at the internal ring realizes the decoupling controlto the driving current of the permanent magnetic synchronous motor of a compressor and indirectly controls the output torque of the motor; the speed ring at the external ring is used for controlling the working frequency of the compressor, thus not only meeting the stable requirement during fixed frequency but also meeting the dynamic response during the frequency conversion; and the control software comprises a primitive recursive function and a main interrupt function.

This invention relates to a three freedom degree AC-DC radial-axial mixing magnetic bearing, which is fit for the electrical main shaft and rotary main shaft needs suspending support. The permanent magnet will provide radial-axial static bias magnetic flux to generate static bearing ability; the radial controlling coil and the axial controlling coil will provide magnetic flux to generate dynamic suspending force, making the rotor suspending on the balance place in radial-axial three freedom degree. The power enlarging circuit comprises axial liner power amplifier and radial CRPWM current tracking inverter, and the displacement sensor will test the shift of the rotor and then feedback to DSP controller; the DSP will operate PID compute and process, provide controlling signal to power enlarging circuit; the controlling signal will generate controlling current in magnetic bearing coil, and the controlling current will generate magnetic force in operation magnet, by which it can realize the stable suspending and real-time monitoring of the rotor in radial and axial.

The invention discloses an intelligent wheelchair which comprises a wheelchair body. The wheelchair body is provided with two rear driving wheels and two front follow-up wheels. The two rear driving wheels are respectively provided with a brushless DC motor. The brushless DC motors are connected with a double closed loop control system. The double closed loop control system is controlled by a DSP controller, and the DSP controller controls the rotating speeds of the motors so as to realize different rotating speeds of the two rear driving wheels and achieve differential steering. According to the intelligent wheelchair, the double closed loop control system controls the rotating speeds of the driving wheels to achieve high-precision and high-stability control over the speeds; moreover, in the turning process, the DSP controller controls the different rotating speeds of the rear driving wheels, so that turning is realized, and the structure of the wheelchair is simplified.

The invention discloses a generator system for wind power generation and a variable speed control method; the system comprises a permanent magnetic synchronous generator of which the electrical energyoutput is connected with a Vienna rectifier device, and is characterized in that a stator winding of the permanent magnetic synchronous generator comprises two sets of triphase windings with electrical degree difference of 180 degrees and unconnected neutral points thereof; the Vienna rectifier device comprises two Vienna rectifiers with identical structure, which are in parallel connection withthe DC side with a central point O connected with a DC bus capacitance midpoint; the AC side is connected with the two triphase windings of the generator respectively; a Boost inductance of the Viennarectifier is directly provided by the leakage inductance of the windings of the generator; each Vienna rectifier device is controlled by a DSP controller to maintain the balance of the DC bus voltageby the phase current and line voltage collected in the AC side and the bus voltage collected in the DC side; and the variable speed control of the generator is realized by collecting the rotating speed of a fan and the current wind speed.

The invention discloses a three-dimensional attitude display and remote automatic control system of an excavator. A pull line type displacement sensor is adopted to acquire a displacement signal of amoveable arm hydraulic cylinder, a bucket rod hydraulic cylinder and a scraper bucket hydraulic cylinder, and the displacement signal is sent to a computer through a data acquisition card; a car bodyrotation angle signal is acquired through an electronic compass, and the car body rotation angle signal is sent to the computer through an RS232 serial port; the computer is used for storing and processing data, so that a three-dimensional animated simulation attitude of the excavator is displayed in real time; an expected track of a scraper bucket tail end is planned; according to a practical displacement and car body rotation signal of a working device, a control algorithm is run by performing kinematic conversion on the practical displacement and car body rotation signal and comparing the practical displacement and car body rotation signal subjected to kinematic conversion with expected track data so as to correct the track; a CAN communication mode is adopted for realizing data communication between the computer and a special DSP controller of the excavator; operation state information is monitored in real time; operation track of tooth tips of X, Y and Z-axis scraper bucket and athree-dimensional displacement curve of the tooth tips of the scraper bucket are displayed in real time; and remote automatic control is realized through WEB service of a virtual instrument.

The invention belongs to the field of photovoltaic power generation, applies a power decoupling circuit to reduce the capacity of a capacitor at the side of a DC (Direct Current) bus for prolonging the service life and improving the reliability of the inverter, replaces an electrolytic capacitor with high capacity and a short service life with a thin film capacitor with low capacity and a long service life and designs a miniature photovoltaic grid-connected inverter. To fulfill the aims, the invention adopts the technical scheme that the miniature photovoltaic grid-connected inverter with an optimized DC bus capacitor comprises a main circuit and a control and driving circuit, wherein the main circuit is formed by a photovoltaic cell panel, a phase-shift full-bridge circuit, a high frequency transformer, a full-bridge rectifying circuit, the DC bus capacitor, the power decoupling circuit and an inverter circuit which are sequentially connected; the control and driving circuit comprises a photovoltaic output current sampling circuit, a photovoltaic output voltage sampling circuit, a power MOSFET (Metal Oxide Semiconductor Field Effect Transistor) driving circuit, a capacitor voltage sampling circuit, a grid-connected current sampling circuit, a phase-locked loop circuit and a DSP (Digital Signal Processor) controller. The miniature photovoltaic grid-connected inverter is mainly applied to photovoltaic power generation.

The invention discloses a DSP-based brushless DC motor control device, comprising: a position sensor, installed on the stator of the brushless DC motor, used to detect the position information of the rotor of the motor during operation, and send the position information to the DSP control device; DSP controller, used to obtain the real-time speed of the motor according to the adjacent position information sent by the position sensor and the time to obtain the adjacent position information; and compare the real-time speed with the preset target speed, and according to the comparison result Send control signals to the drive and inverter circuit; the drive and inverter circuit is used to control the speed and direction of rotation of the motor according to the control signal of the DSP controller. The DSP-based brushless DC motor control device of the present invention utilizes the high-performance data processing capability and rich peripheral interfaces of the DSP controller to realize a set of DSP-based rotational speed closed-loop control system suitable for the brushless DC motor. The device has good anti-interference performance and the system works stably.

A position-sensor-free control system and control method for a brushless direct current motor. The system includes a composite power supply, a main circuit, a brushless direct current motor and a DSP controller, the composite power supply, the main circuit and the brushless direct current motor are connected in sequence, the main circuit is connected with the DSP controller through a sampling circuit, the DSP controller is connected with the main circuit through a drive circuit and a protection circuit, and the DSP controller is connected with an interface circuit and s functional key. The method includes the steps of: 1. detecting a phase voltage counter electromotive force signal and a phase current signal; 2. calculating wire counter electromotive force; 3. determining the position of a rotor; 4. performing inverse transformation; and 5. generating a PWM duty ratio. The method provided by the invention detects counter electromotive force of the motor in a starting and low-speed stage through a wire counter electromotive force method, and integrates an improved wire counter electromotive force method in FOC algorithm, thereby simplifying position and speed calculating processes of the FOC algorithm, improving real-time performance and control accuracy of a system, and achieving the purpose of improving dynamic performance of the motor.

The invention relates to a high-frequency high-voltage switching power supply for electric precipitation. Three-phase alternating-current is input and converted into direct current by a three-phase rectifier filter circuit and then the direct current passes through a high-frequency inverter circuit; a series-parallel connection resonant soft switching circuit is connected between two inverter bridge arms in the high-frequency inverter circuit; the output of the series-parallel connection resonant soft switching circuit is boosted by a high-frequency pulse transformer, the boosted output passes through a high voltage silicon rectifier stack to form high-voltage direct current and the high-voltage direct current is input into an electric precipitator; a DSP controller outputs a control signal to the high-frequency inverter circuit; the input side of the electric precipitator is connected with a voltage and current detection circuit; the detection circuit detects voltage and current and inputs a signal into the DSP controller; the high-frequency inverter circuit is adjusted by the DSP controller; and the DSP controller is connected with an upper computer through a CAN interface so asto realize optimal control. The switching power supply is used for electric precipitation equipment and has the advantages of small volume, light weight, light harmonic pollution, high power factor, high conversion efficiency, and capability of generating waveforms meeting various working condition requirements of the electric precipitation equipment so as to realize energy conservation and emission reduction.

An alternating-current permanent magnet type electric power steering system based on a DSP (Digital Signal Processor) and an electric power steering method belong to the field of automobiles. The electric power steering system comprises a torque turn angle sensor, a vehicle speed sensor, a current sensor, a side acceleration sensor, a yaw acceleration sensor, a motor rotor position sensor, a signal conditioning circuit, a DSP controller, a permanent magnet synchronous motor, a motor drive circuit, a system protection circuit and a communication interface circuit. The side acceleration sensor, the yaw acceleration sensor and the torque turn angle sensor transmit the measured signals to the DSP, after being processed by the DSP through algorithms, the signals such as the electrical angle of the power-assisted motor, the three-phase current and the current vehicle speed are measured by the rotor position sensor, the vehicle speed sensor and the current sensor, and the power-assisted steering and the turn angle control are carried out according to the input signals. With the adoption of the electric power steering system and the electric power steering method, smooth switching between the power-assisted steering control and the vehicle stability is realized, the switching between the turn angle control and the torque control is achieved by a corresponding lower level motor, so that the driving stability of a vehicle and the steering comfort are guaranteed.

The invention provides a distributed wind power plant fan optimized arrangement system and a method and belongs to the technical field of distributed wind power generation programs. The system comprises a data collection module, a topographic map data acquisition module, a digital signal processor (DSP) controller, a load flow calculation module, a maximum switched-in capacity analysis module, a fan optimized arrangement and calculation module and a graphic display module. The method comprises the steps of determining a region for a to-be-established distributed wind power plant, a location for the to-be-established distributed wind power plant to access to a power distribution network, the capacity of the to-be-established distributed wind power plant and the fan number of the to-be-established distributed wind power plant; establishing at least one anemometer tower in the region for the to-be-established distributed wind power plant, calculating the wind shear coefficient and the wind profile function of the anemometer tower to figure out the wake loss so as to obtain the actual wind speed and finally calculating the Weibull distribution function; establishing a constraint condition and an objective function for fan optimized arrangement; optimizing the positions of fans based on the taboo invasive weed algorithm to obtain a fan arrangement optimized solution; finely tuning the positions of fans, and displaying a final topographic map containing the region for the to-be-established distributed wind power plant equipped with fans.

The present invention provides a diagnostics methodology and embedded electronic system that allows optimized low-frequency data sampling for EMA motoring subsystems in an operating vehicle. Each of the EMA motoring subsystems includes: an EMA; at least one motor for driving the EMA; and power controls for operating the motor, wherein the power controls includes a DSP controller for sampling and processing data at low-frequency sampling rates. The diagnostic methodology includes a method that has the steps of: determining an operational mode of the EMA motoring subsystem; selecting a sampling rate optimized for the determined operational mode; acquiring and processing data at the selected sampling rate; and analyzing the processed data to identify and classify a fault of the EMA motoring subsystem.

The invention relates to a permanent magnet synchronous motor drive control system, in particular to the permanent synchronous motor drive control system used for a servo system. The permanent synchronous motor drive control system belongs to the technical field of motor control. The permanent synchronous motor drive control system consists of a power module, a central control unit, two analogue signal processing units, two digital signal processing units, a current measurement module, a rotating speed measurement module, an overcurrent protection processing unit, an isolation unit and a power amplification unit. A drive strategy of the central control unit adopts a space vector pulse width modulation technology, and a speed loop controller with an integral time-varying sliding mode variable structure is designed in a digital signal processor (DSP) controller of the central control unit. Compared with the conventional control system, the permanent magnet synchronous motor drive control system has higher speed, enhanced anti-jamming capability and enhanced system parameter perturbation robustness; and the sliding mode of sliding mode variable structure control can be designed, and is insensitive to disturbance to the system and parameter variations, so the sliding mode variable structure control has the characteristics of high robustness, quick response, easily implemented comprehensive method and the like.

The invention discloses an atmospheric environmental-friendly optical detecting instrument, and particularly discloses measurement of the average particulate size of atmospheric inhalable particulates and detection of particulate concentration. A multi-wavelength output optical maser sends out laser with certain wavelength under the drive of a DSP (Digital Signal Processing) control module; the laser passes through a single mode fiber, is coupled by an optical fiber coupler, enters a multi-optical path sample cell through an incidence hole, interacts with gas to be measured, mainly has scattering and absorbing effects with the gas to be measured, is reflected for several times in the sample cell, and then is ejected out of the sample cell through the incidence hole; the scattered and absorbed gas enters a photoelectric detector through a laser signal ejected out of the sample cell through the incidence hole, and is converted into a weak electrical signal; the electrical signal is conditioned by a signal conditioning circuit and is input into an A / D conversion module of a high-speed DSP controller; the average particulate size and concentration are calculated under the control of a calculation procedure, and are displayed on an LCD (Liquid Crystal Display) module; in addition, the electrical signal can also be transmitted to a remote monitoring device through a wireless communication module.

The invention discloses the field of dynamic characteristic research for interaction of laser and atmosphere in spectrum detection for trace gas and free-space optical communication, and particularly relates to an automatic tunable system with multiple optical paths. The automatic tunable system comprises angle rotating devices, length adjusting devices, supports, motor supports, stepper motors, a DSP (digital signal processor) controller and a cylindrical main body. The main body can keep vacuum and can bear certain high pressure. Signals are inputted into the DSP controller according to requirements of the optical paths, rotational angles of concave reflectors and required voltage are computed by the DSP controller, piezoelectric transistors (PZT) can drive the concave reflectors to rotate by the rotational angles after being supplied with the required voltage, signals are outputted for triggering and driving to realize automatic angular rotation, simultaneously, the stepper motors are driven, corrugated pipes are driven to stretch or contract, and distances d among reflecting pools are horizontally increased or reduced. The automatic tunable system with the multiple optical paths has the advantages of high precision and sensitivity, simplicity in operation and automatic control function.

The invention belongs to the technical field of a piezoelectric ceramic driving power supply and relates to a piezoelectric ceramic driving power supply and a control method thereof. The driving power supply specifically comprises a power supply module, a control module, a power amplification module and a detection and regulation module, wherein a piezoelectric ceramic self-adaptive time-varying sliding mode control method is designed for a DSP (Digital Signal Processor) controller of the control module so as to realize the accurate control on the output displacement of a piezoelectric ceramic actuator. The piezoelectric ceramic driving power supply and the control method thereof can be used under the action of low DC voltage input, have the advantages of wide frequency response and high precision, can overcome the nonlinear characteristic of the piezoelectric ceramic, can provide three-way driving voltage output to simultaneously provide mutually independent driving voltage for 1-3 piezoelectric ceramic working platforms, and can be widely used in high-precision pointing and tracking of airborne and vehicle-mounted radar antennae, thereby having fine application prospects.

The present invention discloses a low-cost GPS and INS integrated navigation system for multi-rotor aircrafts. The system includes a data acquisition processor; the data acquisition processor is respectively connected to a gyroscope, an accelerometer, a magnetometer and a barometer via an IIC bus; the data acquisition processor controls the gyroscope, accelerometer, magnetometer, and barometer for data collection, and sends the collected sensor data to a DSP controller; the GPS module sends the positioning data to the DSP controller; and the DSP controller conducts navigation calculation on the sensor data and location data. The invention has the beneficial effects that according to the dynamic characteristics of the multi-rotor aircraft and error characteristics of the low-cost sensor, the navigation system provides accurate attitude, speed and location information for the aircraft.

Provided is an IGBT junction temperature measuring device. A power supply circuit of the device is connected with a DSP controller, a voltage collection circuit, a current collection circuit, a voltage reference circuit, a signal processing circuit and an isolation circuit; the two ends of the voltage collection circuit are connected with a measured IGBT and a signal processing circuit respectively; the two ends of the current collection circuit are connected with the DSP controller and the measured IGBT respectively; the voltage reference circuit is connected with the signal processing circuit; the signal processing circuit is connected with the voltage collection circuit, the voltage reference circuit and the isolation circuit; and the two ends of the isolation circuit are connected with the signal processing circuit and the DSP controller respectively. According to the invention, the switching-off delay time tdoff of the IGBT and the collector current of the IGBT are measured in real time, and the present junction temperature of the IGBT can be obtained according to three-dimensional relation among the junction temperature, collector current and switching-off delay time tdoff of the IGBT.

The invention discloses a three-ring control method and a three-ring control device of a single-stage type photovoltaic grid-connected inverter system. Three-ring control comprises a maximum power tracking outer ring, a direct-current voltage middle ring and a grid-connected current inner ring. Direct-current side voltage ring control is added so as to guarantee that the system can respond rapidly when outside illumination is reduced suddenly, direct-current bus voltage is stable in an operation process, and grid-connected current is not distorted. A maximum power tracking method adopts a step-variable disturbance observation method to enable the system to be operated at different voltage points so as to search the maximum power point rapidly. The control device comprises a sampling circuit, a capturing circuit, a digital signal processor (DSP) controller, a driving circuit and the like, and signals generated by the DSP controller are amplified by the driving circuit and sent to an inverter bridge to drive a switch tube. The control method can achieve that the single-stage type photovoltaic grid-connected inverter system can track the maximum power point rapidly when illumination varies frequently and is operated stably.

The invention discloses an optimizing method and a system device for output power of a partially shielded photovoltaic power generation system. The system device comprises a photovoltaic battery plate, voltage and current acquisition circuits of the photovoltaic battery plate and a DSP (Digital Signal Processor) controller, wherein the controller is embedded with an APSOMPPT maximal power point tracking control algorithm program; the control output end of the controller is used for controlling a BOOST circuit through a PWM (Pulse Width Modulation) drive circuit; and the output of the BOOST circuit is connected with load. A tracking method comprises the steps as follows: fistly, obtaining open-circuit voltage of the photovoltaic battery plate; secondly, determining maximal output voltage of the photovoltaic battery plate according to the open-circuit voltage; thirdly, initializing a system and starting a timer; fourthly, when the set time is up, running the APSOMPPT maximal power point tracking control algorithm subprogram to iterate for multiple times; and lastly, taking global optimum of all the particles in the iterating process as voltage of a photovoltaic array for acting on the photovoltaic array. Therefore, the power optimization output of the photovoltaic power generation system is realized.

The invention discloses multiple multiphase fault-tolerant motors for an electric automobile and a decoupling control method thereof. A plurality of multiphase fault-tolerant motors respectively arranged in wheels of an electric automobile are respectively connected with a multiphase independent controller comprising a photoelectric encoder, a DSP controller, an inverter and an automobile signal sensor to form a movement control system of the electric automobile; torque distribution is directly carried out on the multiphase fault-tolerant motors by applying an improved direct yawing moment control method of a support vector basis inverse controller through decoupling among the mass center distortion angle beta, the yawing velocity gamma and the longitudinal velocity vx of the electric automobile. The motors are independently controlled respectively, and therefore, the absence of a certain phase has small influence on continuous running of the system; the motors have good fault operating performance and realize the lateral and vertical integration movement control of the electric automobile to further improve the operating stability of the electric automobile; the invention has stronger electric automobile on parameters and structural changes of the motor system.

The present invention provides an underwater propeller pusher which has self diagnosing function and comprises a driving electrical motor, a propeller, an electrical motor driver, a DSP controller, a leaking detecting sensor, a platinum resistance temperature sensor and a coding device that is used for measuring the rotating speed of the electrical motor; wherein, the driving electrical motor, the electrical motor driver, the DSP controller, the leaking detecting sensor, the platinum resistance temperature sensor and the coding device are all encapsulated inside the sealed and dry inner boat; a cable screwing linker is arranged at the tail of the boat body and can fix and seal the waterproof cable on the crust, while the waterproof cable is connected with the controller and leaking detecting sensor inside the crust. The present invention integrates the driving device, the control circuit and the pusher driving electrical motor crust as a whole and has temperature sensor, leaking detecting sensor and speed sensor and also has self diagnosing function and is provided with a pushing shaft, while the structure is compact, high efficient and safe.

The invention discloses an active collision avoidance system and a controlling method of the active collision avoidance system, and belongs to the technical field of automotive engineering and active safety. The active collision avoidance system comprises at least three radar sensors, an automotive speed sensor, a steering wheel torque angle collecting subsystem, a digital signal processing controller, a drive-by-line braking subsystem, a drive-by-line steering subsystem and an alarm display subsystem. The DSP controller is used for analyzing and processing received information, driving directions of an automobile body, the distance between the automobile body and a surrounding object and a speed difference are obtained, whether the distance between the automobile body and the surrounding object and the speed difference are in fit with safety standards or not is judged according to the driving direction of the automobile body, and if not, the DSP controller drives the alarm display subsystem to give an acoustic alarm and give an image display alarm through a CAN and controls the drive-by-line braking subsystem or the drive-by-line steering subsystem through the CAN, so that collision between the automobile body and the surrounding object is prevented.

The invention relates to an active magnetic bearing using a bias magnetic flux commonly in radial direction and in axial direction. A bias magnetic current in an axial control coil provides a static bias magnetic flux for the radial direction and the axial direction to generate static bearing capacity, the control current in the axial control coil and in a radial control coil provides the controlmagnetic flux to respectively generate dynamic levitation force in radial direction and in axial direction, and external disturbance is overcome to ensure that a rotor levitates stably at a balance position of the radial direction and the axial direction. A bipolarity switch power amplifier is adopted in axial direction, a CRPWM current following inverter is adopted as a power amplification circuit in radial direction, an eddy current displacement transducer is adopted to detect axial displacement and radial displacement of the rotor and feed the axial displacement and radial displacement backto a DSP controller which is used for carrying out PID operation and providing a corresponding control signal for the power amplification circuit after processing, and the power amplification circuitgenerates control current in a magnetic bearing coil to realize stable levitation of the rotor in axial direction and in redial direction. The active magnetic bearing of the invention has the advantages of small volume, low power amplifier cost and high radial bearing capacity.

The invention relates to a breaker synchronous controller and the control method thereof, which realize synchronous control of a medium-high voltage breaker by modern powder electronic technology, belonging to the field of breaker controller technology in power supply. The synchronous controller comprises a voltage current sensor, a DSP controller, a power electronic module and the driving module thereof, a zero-crossing comparison circuit, a DSP control circuit consisting of a parallel wave shaping circuit, a level translation circuit, a DSP chip and an EEPROM for storing the characteristic parameters of the breaker, the DSP controller detects the zero-crossing time of the voltage across or the current flowing the breaker, calculates the delay time according to the characteristic parameters of the breaker, and sends out a control instruction, the power electronic driving module receives the weak signal control instruction sent by the DSP, a secondary control loop of the power electronic is made by shaping and amplifying, thus to realize breaker synchronous control, improve the quality and reliability of a power system. The structure is simple, and the price is low.

The invention relates to a novel double-redundancy electro-hydrostatic actuator (EHA) adopting a novel hydraulic cylinder based on a single-output-rod hydraulic symmetry principle. The double-redundancy EHA mainly comprises two EHA bodies, namely an upper passage EHA body and a lower passage EHA body which are exactly identical, and a novel series hydraulic cylinder, wherein each EHA body comprises a DSP (Digital Signal Processing) controller, a power drive unit, a direct-current brushless motor, a bidirectional servo pump, one-way valves, an energy accumulator, a damping bypass valve, safety valves, a current sensor, a revolution speed sensor and pressure sensors; the series hydraulic cylinder comprises four chambers, namely a chamber A, a chamber B, a chamber C and a chamber D, the action area of the chamber A is the same as that of the chamber D, the action area of the chamber B is the same as that of the chamber C, and the chambers (B and C) and the chambers (A and D) are respectively connected with an oil inlet / outlet of the upper passage EHA body and an oil inlet / outlet of the lower passage EHA body. According to the designed double-redundancy EHA, the size and weight of the existing double-redundancy EHA can be reduced, and the change to the existing EHA is minimal; the designed novel hydraulic cylinder is simple in structure, convenient to manufacture and easy to implement, and thus, the application prospect is broad.

The invention discloses a 35KV large capacity reactive compensation and harmonic suppression integrated system and control method thereof. The 35KV mass storage reactive compensation and harmonic suppression integrated system comprises an active power filter(APF), an inductance, an isolation transformer and multi-group passive filters, wherein the APF is formed by a connection of an DSP controller and an inverter, the output of the APF travels through the filtering inductance and is in parallel connection with the isolation transformer on primary side, the isolation transformer is in series with the single turned passive on secondary side, and the active part as a injection branch of the APF is in parallel connection with the multi-group passive filters into a power grid. The system has simple structure and can manage the harmonic wave of the high-power power grid well, at the same time, the system can compensate the large capacity reactive power. The system has the greatest strengths of low sustainable fundamental voltage of APF and low storage needed inverter, and when the system is powered up or the voltage of the power grid changes immediately, the active part receives small impact and the system has high stability.

The invention provides a closed cardiac compression rhythm prompting device applicable to an automatic in-vitro defibrillator and a method thereof. The device comprises an ARM / DSP controller, a rhythm prompting module and a detection module, wherein a sound generation circuit, a light generation circuit and an image generation circuit in the rhythm prompting module are controlled by the ARM / DSP controller respectively; in the detection module, an excitation pulse generation and drive circuit, an electrocardioelectrode, a preposed difference pre-magnifying circuit, a diode detection and regulation circuit, a filter circuit, gain adjustment and potential transition and an A / D converting circuit are electrically connected in sequence; the A / D converting circuit is electrically connected with the ARM / DSP controller; and the excitation pulse generation and drive circuit and the gain adjustment and potential transition are controlled by the ARM / DSP controller. The device and the method give an operator correct guidance through three prompting modes, namely sound, light and image, and give a specific prompt to incorrect compressing operation by detecting actual compressing rhythm and strength so as to prompt the operator to correct the incorrect operation in time.

The invention discloses a two-way four-quadrant frequency converter, and belongs to the technical field of low power wind power generation. The two-way four-quadrant frequency converter comprises a switching power supply, a driving protective circuit, a program upgrading interface circuit, a coder interface circuit, a DSP (digital signal processor) controller, a first drive circuit, a second drive circuit, a signal acquisition circuit, an alternating-current input reactor, a first circuit breaker, a grid-side frequency converter, a rapid overflowing fuse protector, a current foldback circuit, a motor-side frequency converter and an alternating-current output reactor. According to the invention, the two-way four-quadrant frequency converter avoids the situation that two controllers can not simultaneously achieve coordination control so as to cause direct current bus voltage fluctuation under the occasion of load power and power-supply voltage jump and the like, and the direct current bus voltage after control is more stable; and the two-way four-quadrant frequency converter solves the defects that the electricity is taken from a direct current bus, the integration level of the frequency converter is improved, the structure of the frequency converter is simplified, and the safe operation of the frequency converter is farthest ensured.