173results about How to "Eliminate Oscillation" patented technology

A system including methods and apparatus for treatment of a medical disorder such as obstructive sleep apnea or congestive heart failure. The system involves applying separate and independent gains to flow rates of pressurized gas delivered to a patient during inspiratory and expiratory phases of a respiratory cycle to deliver the pressurized gas in proportion to the respective gains during inspiration and expiration. A base pressure may be applied in addition to the gain-modified pressures and an elevated pressure profile may be employed to assist or control inspiration. The system may be fully automated responsive to feedback provided by a flow sensor that determines the estimated patient flow rate. A leak computer can be included to instantaneously calculate gas leakage from the system. The system may be utilized in connection with conventional continuous positive airway pressure (bi-level PAP) equipment to effect various beneficial treatment applications.

A system including methods and apparatus for treatment of a medical disorder such as obstructive sleep apnea or congestive heart failure. The system involves applying a gain to flow rate of pressurized gas delivered to a patient during inspiratory and / or expiratory phases of a respiratory cycle to deliver the pressurized gas in proportion to the respective gains during inspiration and / or expiration. A base pressure may be applied in addition to the gain-modified pressures and an elevated pressure profile may be employed to assist or control inspiration. The system may be fully automated responsive to feedback provided by a flow sensor that determines the estimated patient flow rate. A leak computer can be included to instantaneously calculate gas leakage from the system. The system may be utilized in connection with conventional continuous positive airway pressure treatments, such as CPAP or bi-level positive airway pressure equipment to effect various beneficial treatment applications.

The invention provides a soft switching conversion device based on a flyback converter. On the basis of the conventional Flyback converter power topology, a clamp branch consisting of a controllable power clamper tube and a clamp capacitor is connected to a drain end of a main power tube in series; a primary side chip of the conversion device receives information such as the peak excitation current, the valley bottom excitation current and the maximum voltage of switching nodes of a converter power loop and generates ideal drive dead time varying with an input voltage and a load condition to control the main power tube and the clamper tube, so that the voltage oscillation of the drain end of the power tube caused by leakage inductance can be completely eliminated. Owing to the basically loss-free soft switching technology of the MOS tube active clamp, the stable clamp voltage value and the primary-side and auxiliary-side full working conditions, the device can work at a high frequency(> 1MHz) and can greatly increase the power density of a power adapter when being applied to the adapter.

System and method for controlling one or more light emitting diodes. For example, the system for controlling one or more light emitting diodes includes a current regulation circuit coupled to a cathode of one or more light emitting diodes. The one or more light emitting diodes include the cathode and an anode configured to receive a rectified voltage. Additionally, the system includes a control circuit coupled to the cathode of the one or more light emitting diodes. The control circuit is configured to receive a first voltage from the cathode of the one or more light emitting diodes, compare a second voltage and a threshold voltage, and generate a control signal based at least in part on the second voltage and the threshold voltage. The second voltage indicates a magnitude of the first voltage.

System and method for controlling one or more light emitting diodes. For example, the system for controlling one or more light emitting diodes includes a current regulation circuit coupled to a cathode of one or more light emitting diodes. The one or more light emitting diodes include the cathode and an anode configured to receive a rectified voltage. Additionally, the system includes a control circuit coupled to the cathode of the one or more light emitting diodes. The control circuit is configured to receive a first voltage from the cathode of the one or more light emitting diodes, compare a second voltage and a threshold voltage, and generate a control signal based at least in part on the second voltage and the threshold voltage. The second voltage indicates a magnitude of the first voltage.

The invention provides a multimode switching control method for body height of an electronic-control air suspension. The method includes defining the body height as three modes including 'body high position', 'body middle position' and 'body low position', utilizing a vehicle speed sensor and a body height sensor to online extract related signals reflecting actual traveling conditions of a vehicle, and determining the height mode of the vehicle according to the above signals; adjusting target modes according to different body heights, adjusting related parameters of body height control models to form three different body height control models, and respectively designing body height PID (proportion integration differentiation) controllers with different control parameters on the basis of the body height control models; establishing a switching control unit, and selecting corresponding PID controllers according to different body height adjusting target modes to perform body height control by the switching control unit. According to difference, in body height control, caused by difference in the body height adjusting target modes, targeted PID controllers are adopted for controlling respectively, so that body height control can be more accurate and more efficient.

The invention relates to the field of integrated navigation systems, in particular to a method for compensating external measurement information based on a SINS / DVL integrated navigation system. The method comprises the following steps of obtaining initial position information of a carrier according to the global positioning GPS system, importing the information into a navigation computer to perform preheating of the fiber optic gyro strap-down inertial navigation SINS system, obtaining a carrier attitude angle according to the fiber optic gyroscope and the quartz accelerometer, carrying out initial alignment and establishing an initial strap-down matrix, obtaining the information about angular motion and linear motion of the carrier according to an inertial component IMU, carrying out navigation solution to obtain a strap-down matrix, establishing a Kalman filter model, correcting to obtain a strap-down matrix corrected by the Kalman filter model, and compensating the strap-down matrix corrected by the Kalman filter model in the step four to the DVL speed measurement according to the SINS / DVL measurement equation of DVL speed measurement. The method provided by the invention can suppress errors during the DVL speed measurement and improve the accuracy of the DVL speed measurement by estimating the attitude of the carrier during the navigation process of the carrier and compensating the attitude to errors of the DVL speed measurement, and is simple and easy to operate.

External-cavity optically-pumped semiconductor lasers (OPS-lasers) including an OPS-structure having a mirror-structure surmounted by a surface-emitting, semiconductor multilayer (periodic) gain-structure are disclosed. The gain-structure is pumped by light from diode-lasers. The OPS-lasers can provide fundamental laser output-power of about two Watts (2.0 W) or greater. Intracavity frequency-converted arrangements of the OPS-lasers can provide harmonic laser output-power of about one-hundred milliwatts (100 mW) or greater, even at wavelengths in the ultraviolet region of the electromagnetic spectrum. These high output powers can be provided even in single axial-mode operation. Particular features of the OPS-lasers include a heat sink-assembly for cooling the OPS-structure, a folded resonator concept for providing optimum beam size at optically-nonlinear crystals used for frequency conversion, preferred selection of optically-nonlinear materials for frequency-conversion, and compound resonator designs for amplifying second harmonic-radiation for subsequent conversion to third or fourth harmonic radiation.

The invention discloses a solar photovoltaic maximum power tracking control method. The solar photovoltaic maximum power tracking control method comprises the following steps that step 1, maximum power tracking is carried out by adopting a variable step perturbation observation method; step 2, after entering a parabola fitting region R, a maximum power point is tracked and determined according toa parabola approximation method; step 3, according to the change of the external environment, the step length is adjusted in real time, the size of the step length is changed dynamically, and maximumpower tracking control is carried out. The solar photovoltaic maximum power tracking control method has the advantages that the position of a working point of a solar photovoltaic system is judged byadopting the perturbation observation method; firstly, it is judged whether or not fitting voltage enters the fitting region R and satisfies fitting conditions, finally, a parabola curve equation is obtained, the voltage and maximum power of the maximum power point are solved, the method eliminates the occurrence of oscillation and misjudgment of a traditional algorithm near the maximum power point, so that a system can accurately track the maximum power, the response time is short, the oscillation is small, and the dynamic error is also smaller.

The invention relates to a servo controller, a servo control system and a servo control method. The servo controller comprises a Kalman filtering operation module used for acquiring error signals and conducting data forecasting smoothing treatment on the error signals so as to smooth the error signals within the processing period to be linear, and a fuzzy-PID module used for formulating a fuzzy rule list, adjusting PID operation parameters according to the fuzzy rule list, and conducting PID operation on the error signals subjected to data forecasting smoothing treatment according to the PID operation parameters so as to obtain servo driving signals. Compared with the prior art, the servo controller has the advantages that realization is easy, hardware requirement is low, automatic target signal tracking precision and efficiency can be effectively improved, and orbital tracking simulation can be conducted.

A highly sensitive low loss and low flow fluid flow switch is coupled with an automatic timer and / or optional transmitter to indicate the flow of gas to an appliance and to automatically start a reminder timer to turn the appliance off. After a preset time limit has expired, the timer either sounds an alarm or wirelessly triggers an alarm in a remote location. The receiver portion of the wireless timer may be mounted directly to the appliance (grill handle), so that the timer automatically resets when activity (cover opening or closing) is detected, indicating the appliance is still in use. An alarm can also be configured to sound when the grill is attempted to be ignited with the cover closed, thereby avoiding a potential explosion. A biasing attraction magnet is incorporated in the fluid flow switch to offset either the force of gravity or a return spring in order to extend performance to low pressure and low flow applications. The piston is sealed for use in high pressure / low flow applications, and provided with a vent hole for residual gas bleed-off upon a stoppage of gas flow.

The invention discloses a multi-model integrated intelligent controlling method of a heavy-duty generator unit. The method comprises (1) constructing a model library and a controller library, wherein the model library comprises N submodels corresponding to the N operation conditions of the generator unit, the controller library comprises N submodel fuzzy controllers, each is designed a control rule corresponding to one submodel; each submodel fuzzy controller is the controller with double inputs and double outputs, the inputs are power angle deviation amount e delta and terminal voltage deviation amount u2, and the outputs are excitation regulation amount uf and valve opening regulation amount u2; (2) acquiring the real-time operating conditions data of the generator unit, and judging the actual operating conditions value based on the variable (delta, Vt); and (3) calculating the matching degree fn of the actual operating conditions value (delta, Vt) and N submodels in the model library, which is used as a weighting coefficient wn (n is an integer) of the integration of the integrated controller. The invention has the advantages of simplicity, good reliability, good real-time performance, high control accuracy, and good practical performance.