411 results about "Phase switching" patented technology

An enhanced liquid crystal display design is provided having relatively fast response time particularly useful in high speed or highly intense applications, such as stereoscopic or autostereoscopic image display. The liquid crystal display device is configured to display stereoscopic images, and comprises an LCD panel and control electronics configured to drive the LCD panel to a desired stereoscopic display state. The control electronics are configured to employ transient phase switching and overdrive the LCD panel to a desired state to enable relatively rapid display of stereoscopic images.

An N-phase switching voltage regulator includes N current sensing elements which carry respective phase currents. The voltages present at the switch node sides of the sensing elements are summed and presented to an amplifier which also receives the regulator's output voltage, to produce an output which is proportional to the regulator's total output current I_out. The invention also provides a means for direct insertion of total inductor output current information into a regulator's voltage-mode control loop, to provide active voltage positioning (AVP) for the output voltage. A voltage based on total inductor output current is summed with the regulator's reference voltage; this sum and V_out are applied to the voltage control error amplifier, the output of which is processed to operate the regulator's switches. This enables the regulator's output to have a desired droop impedance and to provide AVP of V_out as a function of total filtered inductor output current I_out(fltr).

A system and method provides virtual ripple signal generation for use in voltage regulation applications. Some switch-mode power converters or voltage regulators use output signal ripple to effect voltage regulation. A virtual ripple generator provides this type of voltage regulator with a virtual ripple signal comprising an offset component responsive to actual load voltage, but with a generated AC ripple component of arbitrary magnitude that is independent of actual output signal ripple. Unlike the actual output ripple signal, the generated AC ripple component is not dependent on implementation specifics, such as circuit board layout or output capacitor ESR, and may have its gain set independent of the offset component. The generated AC ripple component is synchronized to the inductor switching actions of the voltage regulator and thus reflects actual inductor phase switching in single and multi-phase regulation applications. Virtual ripple signal generation can include output (load) voltage droop compensation.

The invention discloses an intelligent coordination control method for traffic flow of an urban road network with public traffic priority. Each intersection is provided with a network type multi-phase intelligent signal controller, and the intelligent signal controller consists of six main parts, namely a local intersection signal control module, an adjacent intersection information processing module, a communication module, a local vehicle information processing module, a social vehicle detection module, and a public traffic vehicle detection and positioning module. A core part of the intelligent signal controller is the local intersection signal control module which consists of three submodules, namely a public traffic priority module, a green light observation module and a phase switching module, and each module adopts a fuzzy decision method. The method realizes the coordination of the traffic flow of the whole urban road network and the prior pass of public traffic through the information exchange and coordination between intelligent signal controllers of adjacent intersections; and in time-varying and large-flow traffic environment, the control effect of the method is obviously superior to that of the conventional single intersection vehicle induction control method.

The method includes following steps: a master ring is selected from more than two EAPS rings contained by EAPS intersecting rings; there is a main station in the master ring; other EAPS rings are defined as slave rings; there is a main station in each slave ring; the setting results above are saved in each station at intersecting point on the EAPS intersecting rings; after the stations at intersecting point detects a fault on sharing route, it transmits alarm notice to the main station on the master ring and the stations on slave rings; after receiving the alarm notice, the main station on master ring makes protection switching, and the slave station makes self shielding for not making protection switching.

An ink jet recording apparatus having: a recording head having a plurality of nozzles formed thereon to jet ink; a feeding device to feed a recording medium; and a control unit to control ink jetting from the nozzles of the recording head so that the recording head is driven with multi-phase drive to record with recorded pixel locations shifted at every drive phase switching by an integer times a pixel width of a recording resolution.

The invention discloses a power load balancing system applied to a low-voltage power distribution network. The device includes phase conversion devices and a control master station; three-phase input ends of the phase conversion devices are electrically connected with the low-voltage power distribution network; single-phase output ends of the phase conversion devices are electrically connected with electricity consumption terminals, so that the load information of the electricity consumption terminals can be transmitted to the control master station; the control master station performs computation processing, and determines electricity consumption terminals which are on phases with large total load information and require phase switching, and phase switching signals which enable the electricity consumption terminals to switch to phases with small total load information from the current phases, and transmits the phase switching signals to corresponding phase conversion devices; and the phase conversion devices switch the electricity consumption terminals and make the same connected into connection phases of the low-voltage power distribution network according to the phase switching signals, so that the load of the electricity consumption terminals can be re-distributed, and therefore, the load of the electricity consumption terminals can be uniformly distributed on the three phases of the low-voltage power distribution network. With the power load balancing system applied to the low-voltage power distribution network of the invention adopted, the distribution of the load of the electricity consumption terminals between three phases can be adjusted with continuous power supply ensured, and the three-phase load balance of the low-voltage power distribution network can be realized, and line loss can be effectively reduced, and power supply quality can be improved.

In one illustrative embodiment, an apparatus for a current-mode phase rotator with partial input phase switching comprises a mixer, wherein the mixer is a four quadrant current-mode mixer comprised of four interpolation buffers, wherein each interpolation buffer receives as input a clock phase from a set of four equidistant clock phases, and a set of two-output current-steering digital to analog converters that supply tail currents to the mixer wherein a first digital to analog converter has additional switches to connect each of two outputs to one of two polarities of a given clock while each remaining digital to analog converter has no additional switches and has two outputs supplying current only to two different polarities of a same clock phase wherein steering the current during incremental rotation about a phase circle defines an octagonal shaped phase envelope.

To suppress an unbalance of a dwell period in a changeover of phases in which switching is dwelled in an inverter controller. A PWM operation unit 5 includes a modulation-wave generating unit 11 that generates a modulation wave as a voltage command value to an inverter main circuit 2, a carrier-wave generating unit 12 that generates a carrier wave used as a reference for a switching command, and a comparing unit 13 that compares the modulation wave generated by the modulation-wave generating unit 11 and the carrier wave generated by the carrier-wave generating unit 12. During an operation in a two-phase modulation mode in which switching of any one of three phases configuring the inverter main circuit 2 is dwelled, the PWM operation unit 5 controls the carrier-wave generating unit 12 to set a carrier wave frequency to an integral multiple of a modulation wave frequency.

In the motor drive apparatus, a Hall element outputs a first sinusoidal signal and a second sinusoidal signal, of mutually opposite phases, in accordance with rotor position. A hysteresis comparator compares the first sinusoidal signal and the second sinusoidal signal outputted from the Hall element, and outputs a rectangular wave signal. A pulse width modulation signal generation circuit detects timing at which phase switches, based on the first sinusoidal signal and the second sinusoidal signal outputted from the Hall element, and outputs a pulse width modulation signal in which duty ratio gradually changes, in a predetermined time-period in which the phase switches. A drive circuit combines the rectangular wave signal and the pulse width modulation signal by a logical operation, and drives the fan motor.

Circuits and methods to correct the load sharing in multiphase switching regulators are provided. Using these systems and methods, the input capacitor voltage signal can be sampled and used for current sensing of the regulator's stages. Differences in the amount of output current for a converter stage can then be determined. Corrections needed to equalize the output current of the converter stages can then be determined and carried out.

The invention provides a method for computing an alternating current system current injected into a direct current system, which can reflect the operation conditions of an alternating current system and corresponding injected current change caused by the change of a direct current control mode, and comprises a fixed-power and fixed-voltage control, fixed-power and fixed-extinction angle control, fixed-current and fixed-voltage control, fixed-current and fixed-extinction angle control, fixed-current control with a low-voltage current limiting process and control characteristics under the condition that the phase switching of a direct current system fails. The method is a core algorithm for studying the mutual influences between alternating current and direct current systems, can be used for planning and operation control of alternating current and direct current power grids, overcomes the drawback of multiple variables used for describing the relationship between alternating and direct currents, solves the problem of the computation of the alternating current system current injected into a direct current system, and provides a technical method for studying the mutual influences between the alternating current and direct current systems in power grid planning and operation.

A motor driving apparatus includes a comparator, a threshold controller, a position determining unit, a phase-switching controller, and a current output unit. While the rotor is stopped, the phase-switching controller supplies a predetermined phase of winding with a current pulse having a predetermined pulse width so as not to cause the rotor to react and operate, in order to determine the initial position of the rotor. The position determining unit determines an initial position of the rotor based on the result of comparison between the induced voltage generated in a non-conduction phase by the current pulse and the threshold. The phase-switching controller performs energization or commutation according to the determined initial position of the rotor to start up the motor.

The open/close body drive device is capable of restarting a brushless motor, without using magnetic pole sensors, so as to securely drive an open/close body in an arbitrary direction when any of the magnetic pole sensors has failed. When a CPU (1) detects an abnormal logic as a detection pattern of the magnetic pole sensors (9), the CPU (1) determines that the sensor has failed and temporarily stops drive of a DC brushless motor (5), and a motor drive unit (4) generates a phase switching signal to prolong one of electric connection patterns for performing sensorless drive when restarting the DC brushless motor (5).

A current sensing circuit for a switched mode power converter employs a passive current sensing network coupled in parallel with the switched inductor. The passive current sensing network is impedance matched to the inductance its inherent resistance, and provides a current sensing node for single wire current sensing by a current sensing circuit. The passive current sensing network can be employed in each of a plurality of phased switching circuits that each contribute to an output of the power converter.

The invention relates to a processing technology of petroleum geophysical exploration data, which is a rapid and effective self-adapting ground surface consistency deconvolution method of a controllable earthquake source. The concrete steps are as follows: using a conventional controllable earthquake source to vitalize and record seismic wave data; adopting the earthquake record of the controllable earthquake source and performing absorption analysis at a selected time window to obtain an amplitude spectrum of a shot point or a demodulation point at a Q absorption model channel in a t1-t2 time window; performing Fourier transform to a scanning signal of a cannon to obtain the amplitude spectrum of scanning related wavelets; working out the exploration factor h(t); and obtaining an imaging section which has an obvious improvement in waveforms of a shallow layer, a middle layer and a deep layer and is vitalized by the controllable earthquake source and an explosive source. The invention can improve the resolving capability and realize phase switching, has the self-adapting capacity of ground surface consistency counting and can obviously improve a controllable earthquake source first-motion wave having larger near ground surface absorption influence to ensure that the processing quality of earthquake data is obviously improved.

The invention discloses a traffic signal coordination control method for urban road, belonging to the intelligent traffic signal system control technology field. The intersection signal coordination control optimization method based on inductive control model comprises the steps as follows: combining with the flexibility character of the inductive control and the line coordination control principle, providing the intersection signal coordination control optimization method based on inductive control model, giving the corresponding switching method and optimization method. The method can respond the vehicle arriving information of each phase of each crossing, determine the phase switching method according to the coordination phase working time, non-coordination phase working time and phase difference; the method is used for coordination control for the urban road, compared with the conventional green wave band control, the green time is saved, the vehicle queuing length is reduced and the road capacity is improved.

The method of synchronizing sequential phase switchings in driving stator windings of a multiphase sensorless brushless motor with a reconstructed information on the current angular position of a permanent magnet rotor, includes sampling on a currently non-conductive stator winding a voltage induced thereon by the resultant magnetic field produced by the drive current forced through currently conductive stator windings that inverts its sign when the rotor transitions across a plurality of significant angular positions, at which orthogonality between the resultant magnetic field and a magnetic axis of the non-excited winding verifies. The sign of the sampled voltage induced on the currently non-excited winding is compared with the sign that is expected upon transiting across the angular position of inversion by the moving rotor for the current phase drive configuration to sequentially switch to the next phase drive configuration upon verifying conformity of the sign of the sampled voltage with the expected sign.

The invention provides a real-time vehicle trajectory prediction method for a signalized intersection. The method comprises the following steps that trajectory data during phase switching of the signalized intersection is acquired, and historical trajectory libraries are built according to the vehicle stopping and passing decisions and the following vehicle state respectively; the stopping and passing decisions of vehicles are pre-judged on the basis of statistical data of historical trajectory characteristic indexes; the single vehicles and the following vehicles are pre-estimated on the basis of the historical trajectory libraries by means of a K-NN model and an IDM following vehicle model respectively; and trajectory prediction is conducted by means of Kalman filtering. According to thetrajectory prediction method, multiple steps sizes of trajectory prediction can be conducted on the vehicles at the signalized intersection, the dangerous driving behaviors of the vehicles can be recognized in advance, the method can be applied to a real-time signal control strategy or vehicle-mounted early warning system, and the potential accident risk caused by the dangerous driving behaviorsis eliminated actively.

The invention provides a three-phase phase-change switch device. The three-phase phase-change switch device comprises an acquisition unit electrically connected with a transmission line at the outlet of a distribution transformer and used for acquiring the voltage data and the current data of an AC in the transmission line; a processing unit electrically connected with the acquisition unit and used for analyzing the voltage and current data of the acquisition unit, determining whether the voltage and current data reach a threshold value condition, and deciding whether to switch a phase-change switch and send out a phase-change instruction; the phase-change switch electrically connected with the transmission line at a load concentration position and used for receiving the phase-change instruction to switch the phase of the AC in the transmission line. The three-phase phase-change switch device of the invention can monitor the three-phase AC automatically, acquire the phase sequence of each phase of voltage and current real-timely and report to a background regularly. When the three-phase power supply loads are unbalanced, the three-phase phase-change switch device can switch the phases automatically according to a set value, or report to the background immediately and actively and execute a switching command of the background, thereby carrying out the on-site or remote phase switching on the AC.

A filament winding apparatus efficiently performs a helical winding process in which the winding angle of the fiber bundle differs. A helical winding head includes two guide rings, adjacently arranged along an axis center of the mandrel, and guide tubes arranged at equal intervals along a circumferential direction of the guide rings. The guide rings are switchable between a first state in which phase positions of the guide tubes are matched and a second state in which the phase positions of the guide tubes are evenly shifted in the circumferential direction by a phase switching structure. Tube exits of the guide tubes are arranged close in the first state.

In the driving operation of a sensorless three-phase motor to be used in a rotation at a comparatively low speed (approximately 2000 RPM or less) and to be bipolar driven, the number of rotations and a rotating position are accurately detected from an induced voltage and a reverse rotation brake is applied in an accurate phase, and furthermore, a short brake is applied at a set rotation number signal or less also in braking. Consequently, it is possible to prevent phase switching from being carried out in an erroneous timing and to prevent a rotation in a reverse direction by an inertia.

A motor drive device having a motor drive unit, a controller, and a rotational detector. The motor drive unit drives a brushless DC motor, the brushless DC motor has a rotor. The controller produces a motor driving signal to drive the brushless DC motor. The a rotational detector detects a rotational state of the brushless DC motor to produce a rotational state signal. The controller receives the rotational state signal from the rotational detector, determines a phase-switching timing to switch a phase of the brushless DC motor based on the rotational state signal, and transmits the phase-switching timing as the motor driving signal to the motor driver.