186 results about "Stepping switch" patented technology

In a method for ascertaining temperatures (tqm, tqh, tom, tok) in an oil-cooled transformer, the transformer terminal voltages (2), the winding currents (3) and the ambient temperature (6) are measured. Furthermore, the status (5) of fans and pumps and the switch position (4) of a stepping switch are established. The measured and established variables (2, 3, 4, 5, 6) are fed to a thermohydraulic model (7), in which state variables (19) are calculated with auxiliary variables (9), which are losses (10) in the transformer, heat transfer parameters (11), flow resistances (13) and the oil flow (12), and a hydraulic network of the oil circuit, which has branches and nodes. The state variables (19) are the average temperatures (tqm) and the hotspot temperatures (tqh) in loss-producing parts of the transformer and the average oil temperatures in branches (tom) and in nodes (tok) of the hydraulic network of the oil circuit. When there is a change in the variables measured and established (2, 3, 4, 5, 6), the auxiliary variables (9) are adapted appropriately, and the rate of change of the state variables (19) is subsequently ascertained and new state variables (19) are consequently calculated. With this method, temperatures (tqm, tqh, tom, tok) and their changes in the transformer are ascertained without temperature sensors, whereby the optimum operation of the transformer is ensured, an early detection of errors and risks takes place and the optimum point in time for service work can be established.

The invention is applicable on the image treatment field, which provides a method, a system and a picture pick-up device for adjusting white balance, wherein the method comprises the following steps switching a image data of a RGB format into a image data of a YCbCr format, estimating the color temperature information of reference white points in images, calculating the gain of channels of R, G and B according to the effective color temperature information, and using the gain of channels of R, G and B to adjust the pixel values of R, G and B in the images. The invention estimates the availability of the color temperature of the reference white point during the white balance adjustment and adjusts the white balance according to the effective color temperature information, which can improve the efficiency and accuracy of the white balance adjustment.

The invention relates to a method for controlling a piezoelectric valve positioner capable of changing PWM (pulse-width modulation) duty ratio. A software system is formed by a main monitoring program module, an initializing module, a parameter self-tuning module, a valve position control module, a man-machine interaction module, an interrupt processing module, an EEPROM (electrically erasable programmable read-only memory) storage module and a watchdog module. Positive PWM duty ratio is changed by adding a five-step switch method with negative PWM into a sectional PI method or a linearization method, and when the control method is applied to small-range step control, positive PWM pulses with big duty ratio can be obtained, valve position starting process can be accelerated, the number of positive PWM pulses and adjusting time of small-range step control can be reduced, and small-range step control process can be accelerated.

The invention relates to a gyro moment measuring device, which mainly comprises a force transducer, a gyro rotor, a gyro stator shaft component, a ball bearing, a gyro power supply slip ring, a gyro bracket, a gyro power supply battery, a signal slip ring of the force transducer, a frame rotating motor, a bracket for the frame rotating motor, a revolution stepping switch for the frame rotating motor, a transmission device, a display device, a base and a deep groove ball bearing. The gyro stator shaft component is connected with the gyro rotor through the ball bearing and is fixedly connected with the force transducer, the force transducer is fixedly connected with the gyro bracket which is connected with the base through a rotating shaft, an output rotating shaft of the frame rotating motor is connected with the transmission device which is engaged with a gear on the gyro bracket, and the bracket for the frame rotating motor and the display device are fixedly connected with the base. The gyro moment measuring device uses the force transducer to measure pressure, calculate gyro moment and display the gyro moment in the display device, and can intuitively learn gyro moment effect.

A two-range switching potential difference meter with four measuring discs and applying distributary branch is composed of two ranges and four measuring discs as 20x 5 omega, 10x 0.55 omega, 9x 1.1 o mega and 10x 0.11 omega. It features that all measuring resistance are directly connected by conducting wire to exclude contact resistance and variation from measuring-stepping switch out of measuring result and integer power of one digit number multiplying by ten is used as value of resistance being used for range changeover.

The invention discloses a realization method and system for a control outer ring of a solar array simulator. The method comprises steps of generating a UI-RI mixed data table based on a UI data table and a RI data table; and acquiring the sampling voltage of the output of the solar array simulator, searching the UI-RI mixed data table according to the sampling voltage, and obtaining the desired current of the corresponding working point on the I-V curve set by the solar array simulator The method of adopting the UI-RI mixed look-up table in the invention is advantageous for the operating point of the SAS on the whole set I-V curve, the linearity of the power current control is excellent, and the stable output can be maintained at any working point without being limited by the fill factor size of the set I-V curve. In the SAS load operating point fast step switch condition, quick convergence to the switched target operating point is realized, the dynamic response performance of SAS is greatly improved, and high dynamic response enables the spacecraft power system testing to be more reliable.

The invention discloses a background control system of a large air-cooler unit, belonging to an automatic control system of a coal-fired power plant. The backpressure control system comprises a PID (Process Identifier), a backpressure automatic setting module, a feedforward signal, a control parameter variable gain module and a step-switching optimization module; a real-time online optimization logic is set up by dispersing a function module, an integrator module, a selection module, an add and subtract module, a division module, a multiply module and a pulse module in the control system, and an independently automatic control system capable of being tracked dynamically and controlled stably; the backpressure control system solves the technical problems that the backpressure control system of the large air-cooler unit has large overshoot and is difficult to realize automation in the whole course, and can be widely applied to the backpressure control of a steam turbine of the large air-cooler unit.

The invention discloses a hybrid multilevel converter and a variable switching frequency trajectory optimization control method thereof. The hybrid multilevel converter is connected between a direct current power grid and a three-phase alternating current power grid. The variable switching frequency trajectory optimization control method of the hybrid multilevel converter comprises the following steps that S1, differential equation models of the hybrid multilevel converter are established; S2, discretization state equations from the (K+1)th step to the (K+delta)th step are deduced; S3, a feasible sampling point set of output current predicted values is determined; S4, the optimal value f<theta> of an objective function f<theta>(k) is obtained, a switching function vector S<theta,opt>[k] corresponding to a feasible predicted position is used as a kth-step switching signal of the hybrid multilevel converter, data loading of a digital signal processor is completed, and a PWM switching signal is sent out at the moment corresponding to the optimal predicated position of a current trajectory. According to the hybrid multilevel converter and the variable switching frequency trajectory optimization control method of the hybrid multilevel converter, submodule direct current bus capacitance and voltage stable control of all full-bridge inverters and all half-bridge inverters of an upper bridge arm and a lower bridge arm can be achieved, rapid trajectory tracking of a current on the alternating current side can be achieved, and variable switching frequency optimization control can be achieved.

A drive system for a vehicle moving along a trackway, particularly a magnetic levitation train, includes a linear motor which has a stator extending along the trackway, and can be connected to a three-phase output voltage of an output transformer. An electrical power supply supplies a three-phase supply voltage which is converted into a three-phase alternating voltage of predeterminable frequency and amplitude by a converter unit. The alternating voltage being connected to the primary winding of an output transformer. To provide for more differentiated power adaptation it is proposed that the secondary winding of the common output transformer be provided with taps which, in transformer mode, can be connected and disconnected by a stepping switch for adjusting and correcting the desired output voltage.

The invention discloses a frequency voltage switching circuit, which comprises a frequency adaptation controller and a frequency voltage switching module. A charge pump output resistance end of the frequency voltage switching module is connected with an adjustable resistor; a frequency gear signal is input into the frequency adaptation controller; and the frequency adaptation controller adjusts the adjustable resistor. The adjustable resistor is a sliding contact type adjustable resistor; and the frequency adaptation controller comprises a frequency gear step switching module and a stepper. The frequency gear signal is input into the frequency gear step switching module and transformed into a step control signal to be output to the stepper through the frequency gear step switching module;and a step control end of the stepper is connected with the sliding contact of the adjustable resistor. The invention also discloses a multi-gear frequency voltage switching method. A frequency gear/step number pair table is established in the frequency adaptation controller. Therefore, when the frequency gear is changed, the frequency adaptation controller can drive the adjustable resistor to change so as to realize the frequency-voltage transformation in the same circuit by searching corresponding step number.

The invention relates to a step switch provided with a preselector and a polarity circuit, a separate polarization resistance being respectively provided at the beginning and the end of the stepped winding. Optionally, the two polarization resistances can be connected continuously or via separate polarity switches.

A three¿C range potential difference meter with four measuring discs and applying conversion branch is composed of four measuring discs as 20x 10 omega, 10x 1.1 omega, 9x 2.2 omega and 10x 0.22 omega. It is featured as connecting all measuring resistances directly by conducting wire to exclude contact resistance and variation of measuring ¿C stepping switch out of measuring result, using integer power of one digit number or two digit number multiplying by ten as value of resistance used on range switch ¿C over.

One or more high-order bit linear branches of a segmented DAC are implemented as R-2R networks geometrically down-scaled from the DAC binary portion by a selected factor. The resulting increase in closely-located mismatch is compensated for by implementing a trim circuit at a low-order end of each such linear branch. The trim circuit is designed with a number of trim steps to compensate for the selected linear branch down-scaling factor. Each trim step switches a resistance into the low-order end of the linear branch resulting in an even resistance increment or decrement at the lumped linear branch output. The trim circuit is calibrated to provide an amount of trim at the linear branch output such that the lumped resistance of the trimmed linear branch matches the lumped resistance of the binary portion within a selected tolerance (e.g., generally +/−0.5 LSB).

This invention discloses a control system of motocycle for on-off shifting; using clutch automatic control system assorting semiautomatic shifting control system, accomplish the automatic on-off of the clutch in the motocycle and semiautomatic shifting. The stepping switch for step election connects with the main control cell via serial communication interface unit and the pulsed coil on the engine engage the main control cell through signal conversion cell. Then the main control cell join the shift display circuit feeler unit for the displacement of the clutch carrier rod respeatively through signal processing unit and signal conversion cell. And it also connects with holding cell, on-off driving cell which engages the on-off actuating mechanism, shift driving cell which engages the shifting actuating mechanism. This invention also unfurls the self-steering way using the system. The intellectualized controlling of the releasement and engagement of the clutch and the action of the shifting makes a timely and sufficient shifting, a high accuracy on-off and a strong reliability and also gives a comfort driving and a long operational life of the engine and air cyclinder.

A DC potential difference meter with four measuring plates is composed of four measuring plates of 20*8omega, 10*0.88omega, 9*0.76omega and 10*0.176omega .It features that all measuring resistances are directly connected by wires to exclude variation and contact resistance of measuring-stepping switch from measuring result and minimum resolution ratio of said meter can be one muV.

The present disclosure is directed towards a dosing unit (100) for an ambulatory infusion system, including: a metering pump unit (110), the pump unit including a dosing cylinder (112) and a piston (111), the piston (111) being arranged in sealing sliding engagement inside the dosing cylinder (112); a valve unit (120), the valve unit (120) having a filling port (127b), the filling port being designed for fluidic coupling with a liquid drug reservoir (300), a draining port (127c), the draining port (127c) being designed for fluidic coupling with an infusion site interface (890), and a shut-off body (126), the shut-off body (126) being movable between a filling position where it fluidic couples the filling port (127b) with the dosing cylinder (112) and an alternative draining position where it fluidic couples the dosing cylinder (112) with the draining port (127c); a valve driver coupler (125), the valve driver coupler (125) being coupled to or integral with the shut-off body and being the output element of a step switching mechanism. The disclosure is further directed towards a drive unit that may be used in combination with a disclosed dosing unit, an ambulatory infusion system and a method for coupling a dosing unit and a drive unit.

The infusion pump includes pump body and medicine liquid flow rate controller. The medicine liquid flow rate controller includes stepped switch set on the control panel of the pump body, setting controller connected to the stepped switch and speed regulating motor unit connected with the setting controller. Branching switches are set for raising control precision of the infusion pump.

A solar energy operated air pump includes a rectangular box having a lower lid connected to the bottom, an upper lid openably covering the top thereof and a solar cell inlaid into the upper lid protected by a layer of transparent painting. Inside the box there are a battery chamber containing spare batteries, a motor having an axis connected to an eccentric cam which respectively pivoted to a pair of push rods. The push rods each has a push plate on free end respectively engaged with a pair of air extractors each of which has an air vessel symmetrically connected to the opposing side walls of the box and each of the air vessels has an air inlet and an air outlet, a three steps switch respectively connected to the motor, the solar cell and the battery chamber. When the motor is operated either by the solar cell or by the batteries, the air extractors pressed by the push plate begins to supply fresh air into the water in a pair through a pair of hoses.

Fire checkout tester includes computer, simulated flame of infrared source (SFIS), display, performance indicator light, A/D conversion module, mode switch, step switch for intensity, signal generation circuit for analog voltage (SGCAV), preprocessing circuit (PC) connected to A/D conversion module, testing circuit, and control process system inside computer. Controlling SFIS and SGCAV, the control process system generates intensity and frequency of signal simulating burning flame in boiler, and processes digital signal output from probe to be fire checked out, processed by PC, and converted by A/D module. The processed result is displayed. Being connected to the output end of the fire checkout amplifier to be fire checked out, the tester gives out tested analog signal and switching value signal. The tester improves testing accuracy. The inaccuracy is caused by unstable reference light as well as individual variation of fire checkout probes and amplifiers.

The invention provides a DC potentiometer with five-digit reading for DC voltage measurement, and comprises three measuring discs of 20X8 Omega, 9X1.76 Omega, 10X0.176 Omega and a 0-0.968 Omega slide discs for providing five-digit reading system, all the resistors for measurement are connected directly with wires, thereby eliminating the contact resistance and variation difference of the step switch from the measurement result.