65results about How to "Simple control loop" patented technology

A stabilization system including a platform supported by two or more rotatably-coupled gimbal frames each having a pivot assembly disposed at its rotation axis to couple an actuator to a rotation sensor having a rotation-sensitive sensor axis that is fixedly disposed with respect to the rotation axis, and a controller including means for accepting the sensor signals and for producing each motor signal needed to dispose the platform in a predetermined angular position with respect to each rotation axis independent of changes in the base orientation. A motion simulator embodiment includes controller means for accepting an external slew signal sequence and means for producing the motor signals needed to move the platform along a predetermined sequence of positions represented by the slew signal sequence.

Methods and apparatus for sensing the output current in a switch mode power supply (SMPS) using primary side sensing are described. A module senses a current in a primary winding of a transformer and a voltage on a primary or auxiliary winding of the transformer, and which includes a multiplier coupled to an output of a signal averager averaging a primary winding current and to an output of a timing signal generator using the sensed voltage to signal when a secondary winding is powering an output of the SMPS, to multiply an averaged current sense signal by a fraction of a total cycle period of said SMPS during which the secondary winding is providing power to provide a signal estimating an output current of the SMPS.

Methods and apparatus for sensing the output current in a switch mode power supply (SMPS) using primary side sensing are described. A system includes a primary current sense input, a charge input to sense a charging time of an SMPS transformer; a discharge input to sense a discharging time of the transformer; at least one averager; and a calculator. The primary current is averaged by the averager over at least a switching cycle of the SMPS and the calculator estimates the output current of the SMPS using the averaged primary current, the charge signal and the discharge signal.

The invention discloses a pressurization control loop and method of a piling machinery power head. The pressurization control loop is a pressurization logic control loop designed through electric hydraulic combined control. The control loop is simple and convenient for a pressurizing winch to coil/uncoil a rope, and convenience in loading and unloading is realized. By the control method, the pressure of pressure oil in the loop is controlled by an overflow valve and a check valve, so that when a main winch hoists, the pressurizing winch can automatically uncoil the rope along the main winch; when the main winch lowers, the speed of the pressurizing winch to coil the rope is perfectly matched with the speed of the pressurizing winch to uncoil the rope; when the pressurizing winch pressurizes, the pressure is controlled by the overflow valve, so that the condition that the pressure of the power head is controllable is realized.

A bi-directional converter voltage controlled current system and methods are disclosed. A bi-directional converter provides a bi-directional current to an electrical bus according to a variable duty-cycle control signal. Also, a bi-directional current sensing sensor senses the bi-directional current to provide a sensor voltage signal proportional to the converter current. Further, a variable duty-cycle controller controls a duty-cycle of the variable duty-cycle control signal to control a voltage of the electrical bus based on an error signal.

The invention discloses a bidirectional hybrid bridge DC-DC converter and a half-cycle volt-second area balance control method, and belongs to a high-frequency switching power supply in the electric power and electronic field. The bidirectional hybrid bridge DC-DC converter disclosed by the invention consists of a main circuit and a control circuit; the main circuit consists of an input side, a high-frequency transformer and an output side; and the control circuit comprises a controller and a driving circuit. Based on the proposed bidirectional hybrid bridge DC-DC converter, half-cycle volt-second area balance control is adopted; the leakage inductance current effective value in a power non-transfer stage can be reduced by adjusting the duty ratio of the input side and by performing the half-cycle volt-second area balance control at the same time, and reactive current can be decreased, thereby lowering circuit on-state loss and ring current loss caused by the current; meanwhile, wide-range soft switching of each switching tube device also can be realized; and in addition, by virtue of the half-cycle volt-second area balance control, real-time control of bidirectional power flow can be realized while the complexity level of the control unit also can be lowered.

The invention discloses a current critical continuous unified control method for a bidirectional DC-DC converter, relates to a current critical continuous unified control method for a dual-active bridge bidirectional DC-DC converter, and belongs to the field of power electronics. According to the control method disclosed by the invention, voltages on a primary side and a secondary side of a transformer and a phase difference between the voltages are controlled to make the converter work in a transformer current critical continuous mode and reduce the ring current and conduction loss of the converter. In addition, a transformer current can be enabled to be in a critical continuous mode through a boundary condition and a control condition, so that the reactive loss of a circuit is reduced, the current stress of a switching tube and the ring current loss of the converter are reduced, and the efficiency and reliability of the converter can be improved. The method further can greatly lower the complexity of a control unit and realize real-time control. The method can be applied to high-frequency isolation switching power supplies.

The invention discloses a switch intelligent interface unit which has the technology comprising: the switch intelligent interface unit is directly installed inside a circuit breaker and forms an organic whole together with the circuit breaker, and an outdoor installation cabinet can be omitted; a software programmable logic (PLC) way is used for replacing a great deal of hardware of a base relay and realizing a secondary circuit of the circuit breaker, so that the secondary circuit of the circuit breaker can be simplified and optimized; and IEC 61850 configuration and GOOSE communication mechanism are supported. The switch intelligent interface belongs to the control field of an electric power system, and can be used for solving the problems of process layer state quantity information acquisition and switch control of a digitized substation.

An audio processing method utilized to generate an audio stream. An audio frame includes N frequency subbands. An Ith frequency subband among the N frequency subbands includes M audio samples and has an Ith psychoacoustic masking value. First, an Ith offset of the Ith frequency subband is calculated. Then, the Ith psychoacoustic masking value and the Ith offset are inputted into a projection formula to generate an Ith projection value. According to the Ith projection value and a limit range, an Ith scale factor is determined. Subsequently, the M audio samples in the Ith frequency subband are adjusted according to the Ith scale factor.

The invention discloses an intelligent control method for a horizontal trajectory of a stratospheric airship. In order to solve a problem of horizontal trajectory control of a stratospheric airship ina wind field environment, the method establishes an observation model and a Markov decision process model of the airship. With consideration of the characteristic object of the airship, an element interval in an action space is limited; on the basis of a known wind field model, neural network learning is carried out on the action input and state output of the airship by using an included angle probability of each wind direction incoming flow relative to the airship as an action selection basis; and according to a learning result, a Q-learning process is entered, a control law is obtained according to an optimal action strategy, an executing mechanism of the airship is controlled, so that tracking of expected horizontal movement is achieved. Therefore, adverse effects on stratospheric airship horizontal movement control caused by factors such as kinetic model parameter uncertainty and environmental wind field interference are effectively eliminated.

An overturn prevention control device for a two-wheel vehicle having a vehicle body, a front wheel, an actuator that steers the front wheel, a rear wheel, and a rear-wheel driving portion, includes an angular velocity sensor and a control unit arranged to output a steering angle command signal for controlling the actuator. The angular velocity sensor includes a detection axis, is mounted on the vehicle body such that the detection axis is downwardly inclined at a predetermined angle relative to a forward direction of the vehicle body, and detects an angular velocity about the detection axis. The angular velocity detected by the angular velocity sensor includes an angular velocity in a lateral direction of inclination and an angular velocity in an azimuthal direction. The zero-set error and offset noise are incorporated into the azimuth angle command. Thus, the two-wheel vehicle can be prevented from overturning.

The invention discloses a control structure of a Kaibel dividing wall rectifying tower. The control structure comprises five control loops, namely (1) a temperature control loop for pressure compensation of a lower side line section, (2) a temperature control loop of an upper side line section, (3) a tower top temperature control loop, (4) a stripping section temperature control loop and (5) a pre-fractionation section temperature control loop. The invention further provides a control method for the Kaibel dividing wall rectifying tower based on the control structure and application of the Kaibel dividing wall rectifying tower to separation of a multi-component mixture. The control method provided by the invention can stably control the large disturbance of the feeding flow or components of the Kaibel dividing wall rectifying tower, and the purity of the four separated products is qualified.

The invention provides a 12 pulse rectifier based on harmonic injection of a DCM (Discontinuous Current Mode) converter and a control method thereof. The pulse rectifier comprises a 12 pulse rectifying circuit and a DCM harmonic injection converter. Based on the traditional 12 pulse circuit, two balance reactors are respectively provided with a winding; unlike ends of the two additional windings are connected; and two dotted ends are used as the input of an AC-DC converter working in a DCM. The output of the AC-DC converter is connected with the output end of the 12 pulse rectifying circuit to return energy to a main circuit; the AC-DC converter working in a DCM of which the input current can automatically track the input voltage can automatically simulate a loss-free resistor to achieve harmonic injection. The AC-DC converter can be a Buck type, a Boost type, a Buck/Boost type, a Cukor type, a Zeta type, an SEPIC (Single-ended Primary Industry Converter) type, a normal shock type, a fly-back type and the like. According to the invention, no complex current control is required by the harmonic-wave injection converter to ensure the formation of harmonic current, and only by regulating the duty ratio and changing the magnitude of the artificial resistance through detecting the load current, the optimal harmonic injection can be realized to reduce the THD (Total Harmonic Distortion) of the grid-side current.

The invention provides a battery charging circuit. The battery charging circuit is characterized in that the structure of a feedback control circuit in the conventional battery charging circuit is simplified; the differential value adjustment between a feedback signal and a reference signal is realized by adopting a comparator; a feedback control signal of a logical level form is output to realize automatic switching among feedback control circuits, so that the phenomena of error switching and simultaneous working of a plurality of feedback control circuits can be effectively avoided, and high circuit portability is achieved. Meanwhile, a control way of switching on in a fixed-duration or switching off in a fixed duration is adopted, so that the circuit structure is easy to integrate.

The invention discloses a small micro-bubble generator and a method, and belongs to the field of micro-bubble drag reduction. The generator comprises a water pump, three valves, a controller, a bubblegeneration chamber, a first pipeline, a second pipeline and a one-way valve. The water pump, a first valve, the bubble generation chamber and a second valve are sequentially mounted on the first pipeline; a solid reaction raw material block is mounted in the first pipeline through a filter screen box to form the bubble generation chamber; a first port and a second port of a second pipeline are connected with two ends of the bubble generation chamber and are positioned between the first valve and the second valve; and a third port of the second pipeline is connected with the outlet end of thefirst pipeline, and a third valve and the one-way valve are installed between the second port and the third port. According to the device, a carbon dioxide gas is generated through reaction of mixed solids of water, an organic acid and sodium bicarbonate, generated bubbles are small, density is large, drag reduction is better facilitated, distribution in water flow is uniform, an extra gas sourcedoes not need to be carried, and the device is small in size and low in cost.

The invention discloses a dual-mode electric vehicle drive motor which relates to the field of drive of various electric vehicles. A point on an armature of a series exciter is taken to confirm a reference point of an extension line on which the armature of the series exciter simultaneously becomes an armature of an alternating-current generator; an alternating-current boosting winding is distributed in an armature groove of the series exciter; one end of the boosting winding is connected to the reference point of the series exciter, and the other end is connected to a rectifying circuit; by the method, alternating current the amplitude value of which is higher than power supply voltage on the series exciter is directly obtained; controllable rectification is applied to the alternating current; and the rectified alternating current is directly fed to a power supply. The method realizes control on the rotating speed of the series exciter and efficient conversion on energy at work, and the series exciter also realizes the function of the alternating-current generator, therefore, a system comprises a set of independent series exciter loop and function and also comprises a set of independent alternating-current generator loop and function, and the two modes coexist and are mutually restricted and influenced to form the dual-mode motor.

The invention relates to a digital-analog hybrid control circuit and a control method of a DC-DC converter. Inductance voltage is converted into current, and a first current controls an oscillator to generate a corresponding frequency signal as a clock of a digital filter; the digital filter performs calculation according to the PWM signal in each clock period so as to generate an inductive current digital signal with the same phase as the inductive current; on one hand, the difference between the output voltage and the reference voltage of the DCDC converter is converted into a digital signal by the analog-to-digital converter and then a compensation signal is obtained by the digital compensator, and on the other hand, the output voltage and the reference voltage are processed into a current iico 2 by the second transconductance amplifier and converted into a frequency signal by the second current control oscillator to serve as a clock of the second counter. The second counter starts counting at the falling edge of the PWM signal, and the PWM rising edge stops counting and is reset, so that a slope signal is generated; the compensation signal and the slope signal are added and then compared with an inductive current digital signal, when the inductive current digital signal is smaller, the PWM signal is controlled to be turned up, and after fixed conduction time, the PWM signal is turned down.

The invention discloses a pitch adjusting system of a rotation type hydraulic proportional servo drive motor, relating to the technical field of wind power generation and aiming to solve the technical problems of high cost and failure rates. The pitch adjusting system comprises a wind wheel with paddles, a generator set, a pitch adjusting controller, a pitch adjusting executing unit and a detecting unit, wherein the pitch adjusting controller is used for controlling the pitch adjusting executing unit to run, the pitch adjusting executing unit is used for controlling the pitch angle change of the wind wheel, the wind wheel is connected with the generator set and is used for driving the generator set to work, and the detecting unit is used for detecting the pitch angle of the wind wheel andthe power of the generator set and transmitting feedback signals to the pitch adjusting controller. The pitch adjusting system is characterized in that the pitch adjusting executing unit comprises a rotation type hydraulic cylinder and a control loop of the rotation type hydraulic cylinder; and the rotation type hydraulic cylinder comprises a cylinder body, end caps at both ends of the cylinder body as well as two stator and one rotor in the cylinder body, and the paddles of the wind wheel are connected with a rotating shaft of the rotor. The pitch adjusting system provided in the invention has the advantages of low cost and failure rate and can be started to generate power at any time.

The invention discloses a single-stage AC-DC converter mode smooth switching and power factor correction control method, and belongs to the technical field of high-frequency switching power supply directions in power electronics. According to the method, a dual-active-bridge DC-DC converter is controlled by using four modes which can be smoothly switched; the control variables of each mode comprise the duty ratio d1 of the primary side, the duty ratio d2 of the secondary side and the phase shift angle between the primary side and the secondary side, and the control variables can be obtained through the critical ZVS condition of each mode; and mode switching does not need to be judged according to a load power value. According to the invention, by taking the effective value of the leakage inductance current of a transformer as an optimization target, the transformation ratio of the transformer is optimized to improve the conversion efficiency of the converter; and by taking the leakageinductance current of the transformer as an optimization target, the transformation ratio of the transformer is optimized, so that the voltage conversion gain of the DAB converter is no longer smallerthan 1 all the time.

The invention discloses a two-degree-of-freedom closed chain flexible mechanism vibration measurement and control device and method, the device comprises a static platform, a lead screw guide rail, a sliding block is arranged on the lead screw guide rail, the sliding block is connected with a long flexible rod, a flexible protrusion beam is arranged on the extending line of the long flexible rod, a short flexible rod is connected with the above joint through a rotating shaft, the other end of the short flexible rod is connected with a rigid crank, the lead screw guide rail and the rigid crank are connected with an AC servo motor, piezoelectric patches and piezoelectric drivers are pasted to the long and short flexible rods, and the flexible protrusion beam is pasted to an acceleration sensor. According to the invention, vibration information of two flexible connecting rods is acquired and inputted to a computer to analyze and process, and purposes of vibration detection and control are achieved.

The invention discloses a redundancy manual control system of a turning and milling composite machine tool. When a numerical control system is influenced by an external interference signal and can not work normally, a manual operation mode is provided to replace the system control mode, so that a numerical control machine tool can still meet the basic machine tool processing requirements. The redundancy manual control system adopts the technical scheme that the redundancy manual control system comprises a numerical control system control unit and a redundancy manual control system part; the redundancy manual control system part is connected with a servo motor through a feed shaft servo driver, is connected with a spindle motor through a spindle frequency converter, and integrates a control panel of the spindle frequency converter, impulse generators of various feed shafts, and control buttons. The redundancy manual control system is additionally arranged on the conventional control system, and the manual operation mode is provided to replace the system control mode, so that the numerical control machine tool still can meet the basic machine tool processing requirements in case of emergency when the numerical control system breaks down or is paralyzed.

The invention discloses a powder material cooling system and a cooling process thereof, and relates to the technical field of powder material cooling. The system comprises a circulating fan, a powderfluidizing cooler, a cyclone separator, a bag type dust collector and a powder conveyor. An outlet in the top of the powder fluidizing cooler communicates with an inlet of the cyclone separator, and agas inlet in the bottom of the powder fluidizing cooler is connected with an outlet of the circulating fan, so that gas and solid phases flow out of the outlet in the top of the powder fluidizing cooler and enter the cyclone separator; the bottom of the cyclone separator is a cooled product material discharge port, and a tail gas outlet in the top of the cyclone separator is connected with the bag type dust collector; the bag type dust collector is connected to an inlet of the circulating fan, so that the gas collected by the bag type dust collector is recycled as fluidizing gas. By implementing the technical scheme, the technical problem that an existing cooling technology is not applicable to some powder materials small in particle size, likely to absorb moisture or go bad and poor in fluidity can be effectively solved, the reliability of the cooling technology can be remarkably improved, and meanwhile the operation cost is reduced.

The invention provides a vehicle electrical control system. The vehicle electrical control system comprises a main control module controlling a door lock module, a light module and a wiper module. The main control module controls and is connected to a power supply supplying power for the door lock module, the light module and the wiper module and a plurality of motors providing power for the door lock module, the light module and the wiper module. The main control module controls the power supply to be connected or disconnected and controls the motors of the door lock module, the light module or the wiper module to achieve functions of the door lock module, the light module and the wiper module, namely, relative functions of the door lock module, the light module and the wiper module are integrated in the main module control, so that a door lock, a light and a wiper can be controlled through the main control module, an electrical control loop of the vehicle is simplified and the cost is saved. The invention also provides a vehicle comprising the vehicle electrical control system.

The invention relates to a stratospheric airship height control method and system, and belongs to the technical field of airship height control, and the method comprises the steps: building a Markov decision process model for airship height control, selecting a plurality of motions from a motion space according to a Q-learning algorithm and a state transition probability based on a current state;determining all actions selected from the initial state to the termination state of the airship, taking all the selected actions as action sequences corresponding to the termination state, finally selecting the action sequence with the maximum target value in all the action sequences as an optimal sequence by utilizing a target optimization function, and controlling the airship to move according to the optimal sequence. Furthermore, the relevant kinetic model parameters of the stratospheric airship do not need to be obtained any more, the real-time state of the stratospheric airship and the set reference state serve as control input of the control system, and a control loop is simplified.