206 results about "Random switching" patented technology

A reconfigurable baseband filter for use in a multimode communication system is disclosed. One or more filter elements can each be configured as a plurality of sub-elements. The value of each of the filter elements can be varied by switching between at least two of the plurality of sub-elements. Switching noise within a desired passband can be reduced by switching at a rate that is greater than the desired passband. The switching noise in the passband can be further reduced by pseudo-randomly switching between the sub-elements. The filter can use a delta-sigma modulator to generate a pseudo-random switching signal.

The present invention relates to a control system (12) for controlling the light output of a light emitting unit (10), which light emitting unit comprises at least one light emitting diode (LED) (14) and is adapted to emit light of at least one color, the control system comprising: a sensor unit (18) adapted to detect the light output of the light emitting unit and provide a corresponding feedback signal; and a control unit (22) adapted to control the light output of the light emitting unit based on a comparison between the feedback signal and a corresponding reference signal representing a desired light output, in order to provide an improved light output, wherein the control unit is further adapted to: determine a random switching period; determine on-time(s) for the LED(s) within the random switching period for providing the improved light output; and control energizing of the LED(s) according to the determined period and on-time(s). The present invention also relates to an LED light emitting unit arrangement, and a method for controlling the light output of an LED light emitting unit.

The invention relates to a method and a system for randomly switching alternating current. The system comprises a voltage detecting circuit, a current detecting circuit, a first switching circuit, a second switching circuit, a control circuit, a pulse width modulator (PWM) and an APFC circuit, wherein the first switching circuit is used for switching on or off a main power supply; the second switching circuit is used for switching on or off a reserve power supply; the control circuit is used for controlling the first switching circuit and the second switching circuit to switch on or off and transmitting a pulse signal to the PWM; the PWM is used for modulating an output dutyfactor according to the pulse signal transmitted by the control circuit; the APFC circuit is used for receiving the output dutyfactor of the PMW so as to control the output current, and thereby the linear rectification of the output current is realized to ensure the synchronization of the output voltage and the current phase of the APFC circuit. The state of the power supply can be automatically recognized by adopting the random switching so as to adapt to power supplies in different environments, and the switching time is greatly reduced and fixed. The current linear rectification can be randomly switched as alternating current to solve the peak interference brought by the random switching, and the power compensation is carried out to realize the minimum loss of circuit power.

The invention relates to a movable termination switching switch-in network method which is used for marking and differentiating a condition code which is distributed and switched in a condition code set. The method includes the steps that a cell distributes the condition code and sets marks to a movable termination (3) which requests to be switched in the cell in the switching way according to a unique mark principle, the termination switches in through random switch-in message; a movable termination (2) requesting the initial switching-in from an idle state selects the condition code without an mark in the condition code set and switches in a network through a random switching-in message competition. The method uses the mark dynamic state to differentiate the switching switch-in and other random switch-in, a unique mark is used to ensure that the termination requesting switching switch-in at any moment can not initiate the same switching switch-in message in the same switching switch-in message component channel, thereby avoiding the impact among different termination switching switch-in messages and the movable termination identity which cannot be confirmed caused by the impact, reducing the switching time delay significantly and ensuring the communication quality.

The quick random access method for upward special-purpose channel enhancement in wideband code division multiple address system includes the following steps: cyctically setting initial leading transmission power excursion quantity and power boosting step size for upward special-purpose channel enhancement by network terminal; according to the received initial leading transmission power excursion quantity and said power boosting step size respectively calculating initial leading transmission power for random access and leading transmission power of every time by mobile terminal. Said invention utilizes the above-mentioned power excursion quantity and larger power boosting step size to increase initial transmission power of random access process, increase probability of success of random access process, reduce time for making power detection and further reduce the time for random access.

The invention discloses a byte alternative circuit of anti power consumption attack that includes coding unit, random switching unit, S-box unit, and recovery unit. The S-box unit consists of 4-16 isomerous S-boxes. The invention adopts isomerous S-box unit to replace the traditional signal S-box, the switching unit is inserted in the input end of S-box unit, and the recovery unit is added behind the output end. When it is been attracting, the invention can select according to the input data of attack, and no need the additional random number generator. On the other hand, the method which adds the number of random plaintext is invalid for the circuit which is provided by the invention. The invention don't need to apply the special circuit and logical mode, and can be compatible with the presexisting AES enciphering circuit. The invention can improve the anti power consumption attack greatly with less expense, and it can cover the key when the hardware of AES is encrypting and decrypting to make the power attack not get the correct key.

The invention relates to a method for realizing a rapid and random switching-in process in a wireless honeycomb network, comprising the following steps of: statistically storing, analyzing and processing the parameter of system information 7, and processing fast random access process. The method particularly comprises the steps of: reading information of the stored parameter of the system information, analyzing and acquiring a stable time interval part and judging whether the current random switching-in time is in the stable time interval part; extracting the parameter of the current random switching-in time from the stable time interval part or through establishing the BCCH channel receiving system information 7 according to the result; and performing the random switching-in process according to the current random switching-in time. Adopting the method for realizing the rapid and random switching-in process in the wireless honeycomb network, the random switching-in transmission is immediately performed according to the random switching-in parameter foreknown in advance, system delay caused by establishing BCCH channel receiving system information 7 is eliminated; and the method greatly improves user experience, and has the advantages of simple and convenient operation process, stable and reliable working performance and wide application range.

The embodiment of the invention discloses a switching method, system and device. The switching method comprises the following steps of: when a terminal receives a switching command transmitted by a network side source node to switch in a no-random access mode, judging whether the effective information of a network side target node is received by the terminal in preset time; and if the terminal does not receive the effective information of the network side target node, initiating random access for switching through the terminal. According to the embodiment of the invention, under the condition of no-random switching failure, the terminal performs the switching in a random access mode, therefore, the switching reliability and the user experience feel are improved.

The invention discloses a flexible totally-assembling system for efficient and random switching of multiple vehicle types. The flexible totally-assembling system comprises upper equipment and lower equipment. The lower equipment comprises a first station, a second station, a third station and a fourth station all of which are linearly arranged. The first station, the second station, the third station and the fourth station are each provided with a high-speed roller bed and a flexible bogie, white vehicle bodies are arranged on the flexible bogies, the flexible bogies are matched with the corresponding high-speed roller beds, the first station and the third station are completely same and are each provided with a transition rail, a rail butting device, a transition carriage and ground rails, the second station is further provided with a side body clamp, a clamp transferring vehicle, an assembly sliding table and a point positioning robot, and the fourth station is further provided with a wire welding robot, a motor tractor and a parking rail. The upper equipment comprises second-layer floors, second-layer robots and upright rods. By means of the flexible-totally-assembling system, the floor space of total assembling is reduced, the vehicle type switching time is shortened, the flexible totally-assembling system has a random switching function, and the flexible totally-assembling system meets the requirements for efficient and random switching of the multiple vehicle types of flexible total assembling.

A safety network transmitting method and its system providing a active defense technology for safe message transmitting in the network can be used in information safety field by setting up safe virtual special network to submit safety service for the data transmitting in the network. The present invention has comprehensively used the communication technology of "main-assistant" machines, the pseudo-random sequence creation technology, the rout-extension protocol and information control extension protocol, through the identification result of pseudo-random sequence message transmitted to each other between the safety routers to mark the safety of the system route and to pick up the safe pathes from the existing network as well as to submit them to the message transmitting.

The invention discloses a relay fault diagnosis circuit and a relay fault diagnosis method. The method comprises the following steps: S01: after a circuit is electrified with low voltage, controlling a detection branch selecting unit (100) by a BMS control unit (200) to perform corresponding voltage detection branch gating operation; S02: detecting the voltage at the two ends by the currently gated voltage detection branch; S03: comparing voltage detected by the voltage detection branch and judging the adhesion state of each relay according to the comparison result; and S04: if each relay in the step S03 does not adhere to each other, performing operating control on the corresponding relay, gating the corresponding voltage detection circuit to perform voltage detection, and judging the failure state of the corresponding relay according to the detected voltage. The detection branch detection unit can perform random switching among multiple to-be-detected voltage circuits, so one voltage detection unit can detect multiple paths of voltage values, the component cost of voltage detection is greatly reduced, a BMS hardware circuit is simplified, the BMS occupied space is beneficial for being reduced and the BMS performance is more stable.

The invention provides a liquid crystal grating and a control method thereof, a 3D display panel and a display device. A first grating electrode in the liquid crystal grating comprises a plurality of grating sub-electrodes arranged in an arrayed mode. A second grating electrode is a whole clear electrode. Or, the second grating electrode comprises a plurality of grating sub-electrodes arranged in an arrayed mode. The first grating electrode is a whole transparent electrode. The multiple grating sub-electrodes on each row are connected with a row driving line through a plurality of control switches. The multiple grating sub-electrodes on each column are connected with a column driving line through the multiple control switches. According to the embodiment, the electrode pattern on the grating electrode is designed into the mode that the multiple grating sub-electrodes are distributed in the arrayed mode, the row driving line or the column driving line is controlled to apply an electric signal alternately, the liquid crystal layer is pervious to light partially and not pervious to light partially, slits are formed at intervals, electric control signals are used for adjusting the shape and direction of gratings formed on the liquid crystal layer, and therefore transverse or longitudinal random switching o the 3D display effect is achieved.

The invention discloses an NPC (network parameter control) inverter mixing random SVPWM (space vector pulse width modulation) control system and method based on a Markov chain and belongs to the field of power electronic application. A three-phase sine-wave generator in the control system firstly produces a three-phase sine wave and transmits the three-phase sine wave to a SVPWM wave generator, a random number generator based on a three-state Markov chain produces a random switching frequency, a random number generator based on a two-state Markov chain produces a randomly assigned zero vector action time and transmits the vector action time to the SVPWM wave generator, and the SVPWM wave generator produces an SVPWM wave according to the received three-phase sine wave, the random switching frequency and the vector action time and transmits the SVPWM wave to a three-phase NPC topological structure. The NPC inverter mixing random SVPWM control system and method have the advantages that a harmonic wave becomes smooth at the switching frequency and integral multiples thereof, electromagnetic noise is suppressed, less electromagnetic pollution is produced, and a Markov chain random algorithm is added, so that a modulation frequency is more uniformly distributed at the periphery of an expected center frequency while advantages of a random modulation technology are guaranteed, and electromagnetic compatibility is improved.

The invention discloses a method for video shooting. The method comprises the following steps: starting a video recording and displaying at least three buttons for selecting shooting modes on a shooting interface; selecting the shooting modes according to the buttons, setting a bottom layer as a snapshot parameter, and shooting according to the snapshot parameter to acquire shooting data; and judging the current shooting mode and encoding the shooting data to obtain a shooting file to complete video recording. The invention provides a mobile terminal of the method and a device for video shooting. The mobile terminal of the method for video shooting is provided, and a user can switch the shooting modes according to the own requirements during shooting, so that random switching of the snapshot mode, a normal shooting module or a slow-shot module is realized; and after shooting is completed and when the user plays the video, the video file can comprise normal-shooting, snapshot and slow-shot videos simultaneously.

The invention discloses a pulse width modulation implementation method for random switching frequency of a power electronic device. During the current switching period, a random number is generated by a DSP (digital signal processor) chip according to a mathematical algorithm, a periodical register value and a comparison register value are calculated by utilizing the random number; the periodical register value is stored in a shadow register of a periodical register during the current switching period to serve as a value of the periodical register in the next switching period, the comparison register value is stored in the shadow register of a comparison register during the current switching period to serve as a value of the comparison register in the next switching period; and when the current switching period is over, the random number is filled in the periodical register and the comparison register respectively by the shadow register of the periodical register and the shadow register of the comparison register. By the aid of the pulse width modulation implementation method, the length and the duty ratio of the next switching period are relatively random compared with those of the previous switching period, and the switching frequency modulated by the pulse width is randomly variable.

The invention relates to a self-protecting method for long-distance upgrading of an optical network unit. When a network administrator needs to carry out long-distance edition upgrading on an optical network unit (ONU), the self-protecting of the edition upgrading of the ONU is realized by a plurality of markers stored in non-volatile storage equipment of the ONU, wherein the markers comprise an ONU start-up subarea marker, an ONU new upgrading edition marker, an ONU edition upgrading completion marker and an ONU upgrading edition verification condition marker, and the non-volatile storage equipment of the ONU is divided into two subareas for storing ONU software edition. According to the invention, the reliability of the current operation edition and the upgrading edition of the ONU is effectively guaranteed, the phenomena of random switching of the ONU start-up edition and uncontrollability of ONU engineering application edition caused by misoperation of the network administrator when the ONU is applied to different local equipment are reduced, the ONU upgrading failure problem is repaired remotely, the engineering problem solving timeliness is improved and the robustness of the ONU equipment is enhanced.

The invention provides a WiFi connection method, and the method comprises the following steps: carrying out the call of a class in a mobile terminal for scanning a WiFi hot spot, so as to obtain an accessible WiFi hot spot; transmitting the MAC address of the obtained WiFi hot spot to a server side, so as to judge whether the server side has the MAC address in a prestored manner or not; receiving a password, corresponding to the MAC address, returned by the server side when the server side has the MAC address; and connecting the WiFi hot spot corresponding to the MAC address according to a connection instruction. The invention also provided with a WiFi connection device and system. The method, device and system can find a WiFi hot spot, the same as a WiFi hot spot scanned by a mobile terminal system, through scanning, enable the success rate of WiFi connection to be improved, can achieve random switching during the WiFi connection, and can achieve automatic connection during the repeated access to the used WiFi hot spot.

The invention discloses a ripple current peak value based random switching frequency modulation method for an NPC converter. The method includes steps of 1, obtaining a three-phase modulation wave according to a carrier wave pulse width modulation method, setting a fixed switching period and solving and outputting a, b and c phase switch states and corresponding acting time of the three phase switches; 2, according to the maximal value and an inflection point value of the slope of ripple current in the three phases, determining the ripple current maximal value, and solving a random switching period meeting a ripple current limit value; 3, using a random switching period for replacing the fixed switching period, and calculating three-phase switch acting time in the random switching period and forming the finally modulation waveform. According to the invention, the ripple current maximal value is obtained through comparison and the switching period is adjusted, so that the ripple currentmaximal value meets the limit value of the ripple current valid value in the random switching period. Therefore, the harmonic content of current output by the converter is reduced effectively and a good practical value is achieved.

A reconfigurable baseband filter for use in a multimode communication system is disclosed. One or more filter elements can each be configured as a plurality of sub-elements. The value of each of the filter elements can be varied by switching between at least two of the plurality of sub-elements. Switching noise within a desired passband can be reduced by switching at a rate that is greater than the desired passband. The switching noise in the passband can be further reduced by pseudo-randomly switching between the sub-elements. The filter can use a delta-sigma modulator to generate a pseudo-random switching signal.

The invention discloses a digital background correction method based on a least mean square algorithm, which is suitable for a split SAR ADC. The method comprises the following steps: firstly, settinga split SAR ADC, and performing digital background correction based on a minimum mean square algorithm on the set split SAR ADC, wherein the split type SAR ADC comprises two ADC modules, a main DAC capacitor array in each ADC module adopts a non-binary capacitor array; meanwhile, the weight of the highest-order capacitor in the main DAC redundant capacitor array is set to be minimum, so that eachcapacitor including the capacitor with the maximum weight in the main DAC capacitor array can be effectively corrected through random switching of the correction DAC capacitor array, and the linearity and the dynamic range of the ADC are improved; the introduction of the correction DAC random switching mode can effectively solve the problem that the correction is invalid due to the fact that thetwo ADC capacitors are not consistent in direction. In addition, redundancy is introduced into the main DAC capacitor array, so that dynamic errors introduced into the quantization process of the system can be weakened, the correctness of each switching is ensured, and the iteration speed is increased.

The invention relates to a sliding mode control method with random nonlinear disturbance. In order to solve the problems that random switching nonlinearity, state time delay and uncertainty cannot beprocessed simultaneously through an existing sliding mode control method, consequently, system output is greatly affected by external disturbance, and the sliding mode control precision is low, the sliding mode control method with random nonlinear disturbance comprises the steps that 1, a dynamic model of a networked control system with the random switching nonlinearity and the bounded state timedelay is established; 2, design of a sliding mode face is conducted on the dynamic model established in the step 1; 3, sliding mode dynamic of the sliding mode face is calculated; 4, the distinguish condition for ensuring the sliding mode dynamic H<infinity> is obtained, and a sliding mode face parameter matrix G is obtained by solving the distinguish condition; and a sliding mode controller is constructed according to the obtained parameter matrix G. Sliding mode control over the networked control system with the random switching nonlinearity and the bounded state time delay is achieved. Thesliding mode control method is used for the field of networked control.

A random number generator comprising a plurality of pseudo random number generating units that can respectively output random numbers in specified pseudo random number systems, an output random number generating unit that generates output random numbers based on outputs from a plurality of pseudo random number generating units, a physical random number generator that generates physical random numbers, and a switching unit for switching between the necessity and the non-necessity of updating output values from pseudo random number generating units based on physical random numbers generated by the physical random number generator. Based on which pseudo random number system an output random number is generated is randomly switched based on a physical random number, making it very difficult to predict a random number compared with a conventional one.

The invention belongs to the field of electrical technology and discloses a phase sequence self-adaption trigger circuit of a three-phase fully-controlled rectifier induction heating power supply. The phase sequence self-adaption trigger circuit is connected in series between a three-phase alternate current and a three-phase full-bridge thyristor drive axle and mainly comprises a phase sequence judging circuit, a three-phase synchronous signal additional phase shifting and phase sequence gating circuit, a thyristor three-phase trigger pulse phase shifting circuit and a three-phase trigger phase gating and output circuit. After a three-phase switching-in phase sequence of the induction heating power supply is judged by the phase sequence judging circuit, a suitable three-phase rectifier trigger pulse is generated by the three-phase synchronous signal additional phase shifting and phase sequence gating circuit and is sent into the thyristor three-phase trigger pulse phase shifting circuit to generate phase shifting; and the three-phase rectifier trigger pulse which is subjected to phase shifting is sent to the three-phase trigger phase gating and output circuit to drive a thyristor of the three-phase full-bridge thyristor drive axle. According to the invention, the random switching-in of a line sequence of three phases of the induction heating power supply is implemented and the phase sequence self-adaption trigger circuit has the characteristics of simple structure and low cost.

The invention provides a time-division MIMO radar space-time phase decoupling method based on random transmitted pulse. The time-division MIMO radar space-time phase decoupling method based on randomtransmitted pulse can realize preferable correct estimation of the target angle and velocity by separating the spatial frequency and the Doppler frequency. The time-division MIMO radar space-time phase decoupling method based on random transmitted pulse includes the steps: 1) designing a random transmission measurement matrix, obtaining a sequence of controlling random switching of transmission array elements by using the random transmission measurement matrix, and replacing the original sequential time division manner of, transmission array elements, periodically following pulse transmissionaccording to the space locating place by a random transmission time division manner; 2) multiplying the random transmission measurement matrix by a standard Fourier orthogonal basis matrix to obtain aperception matrix, and performing reconstruction of Doppler frequency spectrum along the distance dimension by using a FOCUSS sparse reconstruction method to achieve independent estimation of the moving target velocity; and 3) performing matched filtering processing on the angular dimension along each distance-Doppler unit to obtain the spatial frequency spectrum of the unit so as to extract thetarget angle information, and completing independent estimation of the target angle.

The invention provides a frequency modulated continuous wave radar system based on random switching array antennas. The frequency modulated continuous wave radar system comprises a transmitting module, an antenna module, a switching module, a receiving module and a processing module, wherein the antenna module comprises the transmitting antenna and the receiving antenna, the transmitting antenna transmits transmitting signals, so that targets are scanned, and the receiving antenna receives target reflecting signals; the switching module comprises multiple gating switches and controls multiple receiving array elements to be connected with a single receiving channel, and the gating switches are switched randomly, so that the target reflecting signal of the receiving array element connected with the gating switch which is currently connected occupies the receiving channel; synthesized signals in the receiving channel and the transmitting signals are mixed through the receiving module, intermediate-frequency amplification and band-pass filtering are conducted on the mixed signals, and therefore intermediate-frequency signals are obtained; digital sampling is conducted on the intermediate-frequency signals and following processing is conducted through the processing module. Cost and complexity of the radar system can be effectively reduced by the system and the problem of space-time coupling caused by sequential switching of the switches can be effectively solved.

The invention discloses a random switching system H8 filtering information processing method based on a resident probabilistic information method. The random switching system H8 filtering information processing method comprises the following steps that (1), input signals are sampled, quantized and coded first and sent to a receiving end, and a networked switching system with time-variant delays and external interference is analyzed; (2), data received by the receiving end are decoded and transmitted to a filter, and the issue about design of the H8 filter of the switching system is discussed based on the resident probabilistic information method; (3), a novel switching system and a novel filter model are established based on resident probabilistic information in each subsystem of the switching system, and switching system information is restored according to the newly-established filter model. According to the random switching system H8 filtering information processing method, the issues about design of the H8 filter of the disperse switching system with the time-variant delays are studied, the information processing method based on the filter is provided, and the stability of the whole system is guaranteed.

The invention provides a dynamic frame switching model based on SpringDM, which can deploy a plurality of data access strategies of a persistence layer on a dynamic model and provide persistence layer services for outsides in a mode of issuing SpringDM service. The dynamic model can randomly switch the plurality of data access strategies and can provide support for multi-frame OSGi (Open Scene Graphic) generalization as a general mode in which J2EE (Java 2 Enterprise Edition) persistence layer frame is deployed in the OSGi. The invention applies the dynamic model to realize the persistence layer of RFID (Radio Frequency Identification) middleware. Enterprise-level RFID middleware requires that the data persistence layer can be flexibly switched among the plurality of data access strategies so that the JDBC (Java Data Base Connectivity) of the data access strategies of the persistence layer and the data access frame Hibernate and iBatis of the persistence layer are simultaneously integrated on the OSGi frame, and the persistence layer services are provided for the RFID middleware in the mode of issuing the SpringDM service. The RFID middleware can realize that the data access strategies are randomly switched by selecting different services.

The invention provides a telescopic seat mechanism which mainly comprises a seat cushion and sliding groove mechanism, a secondary telescopic rod, a pulley assembly and a first driving mechanism. In addition, the invention further provides a life self-care vehicle with the telescopic seat mechanism. The life self-care vehicle comprises a chassis walking mechanism, a fixed support located in the front of the chassis walking mechanism, an armrest mechanism located on the upper portion of the fixed support, an auxiliary standing mechanism, pedals located on the two sides of the middle of the chassis walking mechanism and the telescopic seat mechanism. A user's random switching between a standing posture and a sitting posture is achieved. The telescopic seat mechanism and the life self-care vehicle with the same have the advantages of being ingenious in design, compact in structure, simple to operate, safe and steady.