506 results about "Time switching" patented technology

In a control apparatus for a motor, an over-current protection circuit detects an abnormality in a motor current forcibly turns off a MOSFET. The over-current protection circuit has a timer function and a time switching function. In the timer operation, the over-current protection circuit stops an abnormality detection signal for an ON time period before producing the signal for an OFF time period when a current flowing through the motor exceeds a predetermined threshold value. The time switching function is for controlling to lengthen the OFF time period to a relatively larger value in comparison with the ON time period.

A method and apparatus are disclosed for providing a television viewer with a summary of a portion of a program that he or she has missed, after switching to the program at some time after the program has begun. Generally, the times at which the viewer first tuned to a program, left the program and then returned to it would respectively be monitored. A summary for a missed portion of the program, as determined from these times, would then be furnished to the viewer. In a useful embodiment of the invention, a method is carried out in association with an array of data transmission channels, wherein the channels are respectively connectible to a video receiver or like device, and video content is simultaneously transmitted through each of the channels. The receiver is operated to display the video content transmitted through a first one of the channels during a first time period, and to display the video content transmitted through a second one of the channels during a second time period that follows the first time period. The method further comprises generating a summary of the video content transmitted through the second channel during the first time period, and then presenting the summary to a user of the video receiver during the second time period.

A method allows the transmitter to change transmission to a better channel in order to minimize transfer interference. In general, the transmitter will monitor all RF channels and tag the data frames with a preferred channel ID. Upon reception of a tag within a given data frame indicating a change in preferred transmission channel, the receiver will commence listening on the new channel. To avoid transmission lapses, the transmitter may continue to transmit on the old channel for a predetermined amount of time or number of data frames to allow the receiver enough time to switch channels without losing any frames.

The mobile edge calculates close attention of researchers caused by communication advantages brought by the fact that the mobile edge is close to a user, and the communication quality of vehicles canbe effectively improved by combining the mobile edge with the Internet of Vehicles technology. Task offloading problems based on vehicle mobility management are studied herein. In consideration of real-time switching of a communication area passing through a base station and real-time connection and disconnection of a communication line when a vehicle moves, the task unloading problem is decomposed into a resource-based unloading proportion distribution sub-problem and a prediction-based path switching sub-problem. And a maximum energy-saving selection algorithm and a short-term path prediction algorithm are formulated to meet the time delay constraint and minimize the task unloading energy consumption at the same time.

The present invention discloses a control circuit for reducing output ripple in a constant on-time switching regulator and a method thereof, for controlling a power stage. The control circuit determines whether a zero current period wherein an output current is zero is longer than a threshold period, and switches the on-time period to a shorter period if it is longer, whereby the power stage operates according to the shorter period while still in the discontinuous conduction mode (DCM).

Disclosed is a system for dead time switching in a sinusoidally excited PM electric machine. The system comprises: a PM electric machine; a position sensor configured to measure a position of the electric machine and transmit a position signal; and a controller, where the controller receives the position signal. The controller executes a method comprising: obtaining a duty cycle command; generating a first control command signal to an upper switching device and a second control command signal to a lower switching device configured to drive the electric machine in response to the duty cycle command; and applying a dead time to the first control command signal to ensure that the upper switching device and the lower switching device are not conducting simultaneously; and wherein the dead time comprises a turn on delay and an advance turn off.

An electric power retention distribution cell supplies stored electrical power as the primary electric supply to an end user at predetermined times. The cell has a rechargeable battery assembly, a bi-directional inverter and a switch control, and is connected to an electric utility grid, to one or more end users and to alternate power generation sources, such as wind or solar. The battery assembly is charged from the alternate power generation source and from grid power, and the cell is switched at selected times to provide the primary electric supply from stored electric power in the cell to the end user. A circuit of the battery assembly gives an extended electric power storage time by controlling storage parameters. Networks using the electric cell are also described for a utility hub network formed using two or more cells, and for a regional utility hub network formed using multiple utility hubs.

The invention belongs to the field of additive manufacturing, and discloses a heterogeneous multi-material additive manufacturing system. The heterogeneous multi-material additive manufacturing system comprises a jointed-arm robot, a printing device, a material reducing device and a monitoring feedback device. By the adoption of the rotary-type multi-sprayer switching printing device, the mode that a plurality of wire feeding printing mechanisms rotate to be switched is adopted to conduct multi-material multi-process real-time switching printing, and multi-material multi-process efficient 3D printing formation is realized; and the binocular stereoscopic vision on-line real-time monitoring feedback device can feed back layer-layer temperature information and 3D profile information of machined parts in time and compares the information with an original model to be calibrated, and the material reducing processing opportunity and corresponding material reducing processing parameters are determined. By means of the heterogeneous multi-material additive manufacturing system, additive manufacturing and subtractive manufacturing can achieve collaboration in a high-precision and high-efficiency mode, and large complex structure parts of different inorganic nonmetal composite materials can be formed. Meanwhile, the heterogeneous multi-material additive manufacturing system is simple in structure and easy to operate and control.

The present invention is directed to a time-switched preamble generator and method of generating a time-switched preamble for use with a multiple-input, multiple-output (MIMO) transmitter employing first and second transmit antennas. In one embodiment, the time-switched preamble generator includes an initial preamble formatter configured to provide a first preamble to the first transmit antenna and a second preamble to the second transmit antenna during an initial time interval. The time-switched preamble generator also includes a subsequent preamble formatter coupled to the initial preamble formatter and configured to provide the second preamble to the first transmit antenna and the first preamble to the second transmit antenna during a subsequent time interval.

The quantum key distribution (QKD) systems (200, 300, 400) of the invention includes first and second QKD stations (Alice and Bob) according to the present invention, wherein either one or both QKD stations include fast optical switches (120, 220, 310, 320). Each fast optical switch is respectively optically coupled to two different round-trip optical paths (OP1 and OP2 at Alice, OP3 and OP4 at Bob) of different length that define respective optical path differences OPD_A and OPD_B, wherein OPD_A=OPD_B. By switching the fast optical switches using timed switching signals (S1-S3 at Alice, S4-S6 at Bob) from their corresponding controllers (CA at Alice, CB at Bob), the quantum signals—which can be single-photon or weak-coherent pulses—can be generated from a single optical pulse (112), randomly selectively encoded while traversing the optical paths in Alice and Bob, and then interfered and measured (detected) at Bob. The QKD system has less loss as compared to conventional fiber-based QKD systems because it omits at least some of the beamsplitters in conventional QKD systems.

A boost regulator is provided that has increased efficiency. The increased efficiency is provided by incorporating a sensing circuit that senses when the current in the boost regulator's inductor is near zero or when the voltage at its switching node is near zero or virtual ground. A switching signal is provided to the boost regulator's switching transistor when the near zero current or voltage is sensed. Switching at the near zero current or voltage moment (the “critical conduction moment”) helps to eliminate or minimize the power loss associated with switching the transistor at a time other than during the critical conduction moment.

The invention discloses a communication method and system based on encryption transmission and wireless energy carrying, and belongs to the technical field of wireless communications. According to the communication method, manual additional noise is added into signals of a sending end BS, and on the premise of keeping the signal to noise ratio on a master user link, a beam forming technology is adopted according to the orthogonality of a channel and the manual noise, so that the signal to noise ratio on a wiretap link is reduced, encryption transmission speed of the system is increased, and safety of information transmission is promoted; a dynamic power distribution method based on slot time switching is adopted for an access end, by using slot time switching, a part of the signals are used for energy harvesting, and the other part of the signals are used for information interaction, so that energy and information are transmitted simultaneously, and a part of the signals received from a base station by a user are used for energy harvesting and are converted into chemical energy to be stored in a battery so as to meet the need for power of operation of user nodes. Meanwhile, aiming at the incomplete characteristic of actual channel information, a norm approximation lossy scheme is adopted, so that a system device possibly operates in a defective channel environment, and robustness of the system is improved.

Expanding the coverage of a time-shared network comprising electronic edge nodes interconnected by bufferless fast-switching optical nodes is enabled by combining spatial switching with temporal switching. The output side of each edge node preferably connects to a large number of core switches through individual time-locked channels and the input side preferably connects to each of a small number of core switches through a channel band having a sufficiently large number of channels. Wavelength routers may be used to aggregate individually-routed channels into WDM links.

A remote control system for controlling electrical apparatus in customer premises includes a home control interface for connection by way of network termination equipment, e.g., a telephone socket, to a communications line to a telephone exchange. The home control interface is responsive to signals received from a home control platform connected to the telephone network to control electrical apparatus by way of module interfaces. The home control interface is arranged on demand to transmit signals to the communications line indicative of the current status of each piece of electrical apparatus connected to the system. The consumer may use a telephone to pre-record a definition of the electrical apparatus attached to each connection on the module interface which, when remote control requests are forwarded to the home control platform are used to define the respective switch and to announce its status to the caller. The home control platform has capability of storing substantial quantities of data defining changes required in switching at different times.

An improved DDR interface uses single-ended technology and phase-shifts all output data signals and the output source clock signal so that each output signal switches at a different time so that IDDQ spikes caused by I/O switching do not accumulate. A dynamic phase adjustment circuit on the receiver compensates for the phase differences. Clock jitter and skew is reduced and the number of IDDQ pins is reduced to provide a more effective design and high density package.

To read multilevel data from a memory cell having a transistor using silicon and a transistor using an oxide semiconductor, without switching a signal for reading the multilevel data in accordance with the number of the levels of the multilevel data. The potential of the bit line is precharged, the electrical charge of the bit line is discharged via a transistor for writing data, and the potential of the bit line which is changed by the discharging is read as multilevel data. With such a structure, the potential corresponding to data held in a gate of the transistor can be read by only one-time switching of a signal for reading data.

The invention discloses a method for optimizing GSM-R network cross-zone switching. According to the thread coverage characteristic of a railway GSM-R network, under a situation only single network coverage is considered, adjacent districts only have two, that is, a front one and a back one, if the motion direction of a train is affirmed, a switching target district can be determined, thus simplifying a target district list. The invention puts forward a method for determining the motion direction of the train, namely, a BSC switching recording statistical method, which refers to that the previous switching of one special user at the BSC is tracked, the target districts switched orderly by the user in previous N (N is more than and equal to 3) times switching are recorded, and the motion direction of the train is judged according to the order list of districts which are stored in the coverage area of the BSC and follow the network direction. Therefore, a newly obtained switching adjacent district list can simplify switching process, shortening switching time, improving switching reliability, solving the toggle switching problem of districts within the network, and meanwhile avoiding the phenomenon of backward switching.

The invention provides a displayer picture switching response time test system and method. The system comprises a displayer picture switching trigger, a displayer, a photosensitive probe, a photoelectric signal processor and a data collecting operation control unit, wherein the displayer picture switching trigger is used for sending operation instructions to displayer control equipment; the displayer is used for switching pictures under the control of the displayer control equipment, the photosensitive probe is used for collecting brightness of pictures of the displayer, and the photoelectric signal processor is used for outputting second switching value signals to the data collecting operation control unit in real time; the data collecting operation control unit is used for determining the time difference between a first received switching value signal and a second received same-time switching value signal to be the displayer picture switching response time when the second received same-time switching value signal and the second received last-time switching value signal are different. Compared with a manual method adopted for testing displayer picture switching response time in the prior art, the displayer picture switching response time test method has the advantages of improving test efficiency and test precision.

A method and synchronous rectifier controller uses minimum off and on time blanking to avoid switching the switching transistor at incorrect times responsive to transients in the current sense signal. The minimum off time timer is commenced only when the current sense signal is above a reset threshold, and is reset when the current sense voltage falls below the reset threshold. Resetting the minimum off time timer in this manner avoids false starts of the minimum off time timer due to transients and allows the SRC to properly synchronize with the conduction and blocking phases of rectifier operation.

The invention discloses an inverter output filter with a set of series resonance subcircuits. The inverter output filter comprises a traditional LCL output filter body and further comprises a series resonance subcircuit set formed by the N series resonance subcircuits mutually connected in parallel. The N series resonance subcircuits mutually connected in parallel are all connected with a capacitor in the LCL output filter body in parallel. An inverter is connected with a power grid through the inverter output filter. According to the inverter output filter with a set of series resonance subcircuits, the N series resonance subcircuits can respectively filter first N-time switching frequency harmonic components in the output current of the inverter, and therefore the total cost and the total size of the inverter output filter can be reduced.

The invention discloses a time-based strategy control implementing method and a device thereof. The method comprises the following steps of: 1, configuring a busy/free time period, a busy/free time switching point and a duration threshold in a PCRE; 2, when a user logs in, recording the current time, and transmitting a corresponding strategy to a PCEF by the PCRF according to the current time; and 3, when the busy/free time switching point is achieved after the user logs in or a user on-line duration accumulated by the PCRF from the current time achieves the duration threshold, actively transmitting a new strategy to the PCEF by the PCRF. The method is the time-based strategy control implementing method under a PCC architecture, and realizes the control of a busy/free time period differentiation strategy and a differentiation strategy based on the accumulated user on-line duration.