264 results about "Active value" patented technology

A light emitting diode (LED) lighting system includes a controller to control current in one or more LEDs in response to a dimming level input. The LED lighting system implements a dimming strategy having two modes of operation that allow the LED lighting system to dim the LEDs using an active value of an LED current less than a full value LED current while maintaining continuous conduction mode operation. In an active value varying mode of operation, the controller varies an active value of the LED current for a first set of dimming levels. In an active value, duty cycle modulation mode of operation, the controller duty cycle modulates an active value of the LED current for a second set of dimming levels. In at least one embodiment, the active value of the LED current varies from a full active value to an intermediate active value as dimming levels decrease.

The invention provides a fault on-line diagnosis and early warning method of a flameproof dry-type transformer for mine in order to raise the accuracy and rapidity of fault diagnosis. The method comprises the following steps: determining monitoring quantity; extracting characteristic values: extracting a three-dimensional spectra parameter and two-dimensional statistical parameter in a partial discharge signal as characteristic quantities, with regard to operation voltage, current and iron core leakage current, extracting effective values of the operation voltage, the current and the iron core leakage current as characteristic values, and taking real-time values of a temperature parameter as characteristic quantities; using a normalization method to calculate a corresponding value of each characteristic quantity and taking the corresponding value as an input parameter of an intelligent diagnosis system; collecting values of each monitoring quantity under different environment, and obtaining training and testing samples of a nerve network under corresponding environment; establishing a nerve network: selecting a generalized RBF nerve network intelligent diagnosis method to establish a nerve network; utilizing a sample data training nerve network and forming a fault diagnosis tool; establishing a database; storing collected real time data and the above diagnosis result into a ground server real-time database and a real-time early warning information table, and carrying out diagnosis and early warning through an expert system.

The present invention provides a high accuracy, inexpensive diagnosis method and system diagnosing an abnormality of a 10 rpm or less very low speed roller bearing using an acoustic signal, that is, detects an acoustic signal emitted from a roller bearing of a 10 rpm or less ultralow speed rotating machine using a sensor having a sound pickup performance of 10 kHz or less, uses frequency analysis to find the spectrum distribution, processes this to obtain the frequency analysis waveform, compares the spectral average value or effective value of a frequency of the natural frequency of the bearing or more of this with a reference value, and judges that the bearing is abnormal when this spectral average value or effective value exceeds the reference value.

The invention discloses a method for interaction between an anchor and audiences in webcast process. The method comprises the following steps of S1 dividing anchors into multiple levels from high to low according to the popularity values of direct broadcasting rooms; obtaining the popularity value of the direct broadcasting room where the anchor is located and determining the level of the anchor according to the popularity value; S2 obtaining the number of bullet screens of the direct broadcasting room once at every preset time, carrying out dynamic bullet screen grouping according to the number of the bullet screens and monitoring the bullet screen active value in each bullet screen group; S3 obtaining level information and virtual gift giving information of each user in the direct broadcasting room; and S4 determining bullet screen groups displayed at a user side according to the level information and the virtual gift giving information in the step S3; receiving an instruction of the anchor to click any bullet screen in the direct broadcasting room and playing the content of the subtitle on all user sides through the voice; and receiving an instruction of the anchor to double click any bullet screen in the direct broadcasting room and hiding the content of the subtitle on all user sides.

An isochronous processor includes a state register, a functional unit, a control module, and an activation unit. The state register includes an arm buffer and an active buffer. The functional unit performs a transformation operation on the data stream in response to an active value of the control parameter obtained from the active buffer. The control module updates the arm value of the control parameter in the arm buffer in response to control instructions. The activation unit detects a load event propagating with the data stream and transfers the parameter value from the arm buffer to the active buffer in response to the load event. During this transfer, the control module is inhibited from updating the arm buffer.

The present invention discloses a DC curren sensor. In said sensor a detection coil is added, said sensor adopts single-core three-winding structure, when a DC bias magnet is existed in the magnetic core, the induced potential obtained by detection coil can produce positive-negative half-wave unsmmetrical waveforms, said waveforms can be converted into the voltage signal of difference of positive-negative half-wave effective values, after voltage/current conversio, said signal can be fed into feedback winding, said feedback winding cap produce the DC magnetic potential whose direction is opposite to that of magnetic patential produced by detected direct current to balance the bias magnetic potential produced by detected direct current to form 'null-flux' state, so that it can obtain the detected direct current intensity so as to implement the detection of direct current.

The invention discloses a method for grounding and selecting lines of a low-current grounding system. The method comprises the following steps of: carrying out continuous real-time sampling on zero-sequence voltage and zero-sequence current signals, obtaining sampling data and caching the sampling data; calculating the sampling data, obtaining an effective value in set time interval of the signal, and comparing the effective value with the preset threshold value; when the effective value is larger than or equal to the threshold value, determining a fault starting point, taking the fault starting point as the reference time, analyzing and calculating the sampling data which contains the reference time, and is cached in the time interval with preset length, and determining the line with single-phase grounding fault. The invention also discloses a device for grounding and selecting lines of the low-current grounding system. The invention solves the problem of selection missing and selection error because complete temporal data during the occurrence of fault is difficult to obtain by the prior art, improves the accuracy of temporal line selection and has higher credibility of detection results.

The invention provides an object detection method based on continuity. In a current object detection technology, a false alarm rate is high and time is consumed. By using the method of the invention, the above problems can be solved. The method has the following steps: extracting sample characteristics based on forstner operator from 50 positive case training samples; constructing a dictionary through combing a space relation between sample characteristics and carrying out cluster on the dictionary; using a sparse neural network to train a classifier; inputting an image to be detected, carrying out mean filtering and binarization and extracting a region of interest based on an abrupt change; carrying out multi-scale zoom on the region of interest, sliding a 100*40 window on each layer, applying the classifier in a window calculating activity value and acquiring an active value distribution map; using a neighborhood inhibition and repeated part elimination method to search an object activity peak point; calculating the object continuity and obtaining a final object detection result according to the continuity. The method of the invention has the following advantages that: detection accuracy is high; the false alarm rate is low; timeliness is high. The method can be used for object detection and positioning of the large-scale high-resolution image.

The invention discloses a dry type hollow reactor interturn short circuit fault on-line real-time detection method. Magnetic field detection coils are arranged in the upper and lower symmetrical positions of each covering and sealing outer surface of a dry type hollow reactor in pairs, the effective values of voltage differential signals of each pair of magnetic field detection coils are collected when the dry type hollow reactor is in a normal operation state, the reference average value Eio and the reference standard variance dio of the voltage differential signals are calculated, then, the voltage differential signals of the corresponding magnetic field detection coils are detected on line, the on-line average value Ei and the on-line standard variance di of the voltage differential signals are calculated, and finally, the actual operation state of the reactor is judged through comparing Ei with Eio and comparing di with dio. Subband processing is adopted for collected signals, and the invention is favorable for sensitively and accurately detecting the reactor interturn short circuit fault.

A measurement method is disclosed for measuring the resistance component leakage current included in the leakage current and the resistance value that is an insulation resistance to monitor the insulation state of a distribution system. The signal waveform of at least one AC cycle is sampled in the resistance component leakage current measurement from the leakage current signal and the voltage signal of a current transformer of target measurement circuit, and the resistance component leakage current is measured by dividing the average of integrated value of the instantaneous leakage current values and the instantaneous voltage values by the square root of average of squared instantaneous voltage values. A zero-cross detecting circuit for detecting a voltage zero-crossing point of the target measurement circuit and outputting a sampling start signal is provided, voltage digital data of the sine wave form whose effective value is 1 and the output signal of the zero-phase current transformer are sampled, and the products of multiplication are averaged by synchronizing the sampled output signal value and the voltage digital data to obtain an active leakage component current of leakage currents.

A method for displaying authority levels in the process of network anchors, which includes the following steps: S1. Dividing the anchors into multiple levels according to the popularity value of the live broadcast room from high to low; obtaining the popularity value of the live broadcast room where the anchor is located, and according to the popularity value Determine the level corresponding to the anchor; S2. Obtain the number of bullet chats in the live broadcast room every preset time, dynamically group bullet chats according to the number of bullet chats, and monitor the active value of bullet chats in each bullet chat group; S3. Obtain live broadcasts The level information and virtual gift giving information of each user in the period; S4, according to the level information and virtual gift giving information in step S3, determine the bullet chatting group displayed on the user terminal; filter the bullet chatting according to the level corresponding to the anchor The anchor side displays the barrage grouping. The invention also provides a display system for distinguishing authority levels during a network anchor.

The invention relates to an anchor and audience interaction method in an improved network live broadcasting process. The method comprises the following steps of S1, according to popularity values of live broadcasting rooms, dividing anchors into a plurality of grades from high to low popularity values; acquiring the popularity value of the live broadcasting room where the anchor is located, and determining the corresponding grade of the anchor according to the popularity value; S2, acquiring the number of popped screens of the live broadcasting room every preset time, dynamically grouping the popped screens according to the number of the popped screens, and monitoring the popped screen active value in each popped screen group; S3, acquiring the grade information and virtual gift presentation information of each user in the live broadcasting room; and S4, setting the number of popped screen display channels and a single popped screen length threshold; displaying a popped screen group at a client; receiving a command of clicking any popped screen in the live broadcasting room by the anchor, and playing the content of the subtitles by voice on the all user clients; receiving a command of double-clicking any popped screen in the live broadcasting room by the anchor, and hiding the content of the subtitles on the all user clients.

The invention relates to an automatic working system. The automatic working system comprises: a signal generation device for generating a default boundary signal having a default current effective value and sending the default boundary signal to the outside according to a default duty ratio; boundary lines for planning a working region of the automatic working system, transmitting the default boundary signal and generating an electromagnetic field; an automatic walking apparatus which works in the working region according to a default program; a detection unit for detecting the electromagnetic field existing in the environment and converting the electromagnetic field into a corresponding detection signal; a processing unit for receiving the detection signal of the detection unit and generating a processing signal; and a control unit for receiving the processing signal generated by the processing unit and identifying whether the automatic walking apparatus works in the working region according to the processing signal, wherein the default current effective value is not less than 500mA, and the duty ratio is not higher than 0.25. The automatic working system can be used to generate a high-strength electromagnetic field signal, and can also be used to reduce the consumption of the boundary lines on the electric energy.

Provided is a system and method for black-box testing of software using positive and negative test cases with N-way combinations of parameter values. An original model comprising valid and invalid values is modified in a first phase, by generating exclusions (constraints) for pairs of invalid values. A first suite of test cases is generated from the modified model, and positive test cases eliminated, creating a first test suite with only negative tests. In a second phase, the original model is modified by eliminating invalid values, from which a second test suite having only positive test cases for all valid N-way combinations is generated. Merging the two test suites provides a suite of positive and negative test cases that test software with N-way combinations of values, in which each negative test case has only one invalid value.

The invention relates to a method for testing the electrical property of an AC generating set, which comprises the following steps: starting an AC generating set, connecting the output of the AC generating set with a test device, and inputting the serial number of the generating set by a laser scanner to activate the test procedures; automatically adjusting the load of the generating set accordingto a preset power-time function; collecting the voltage, current, frequency and other signals of the generating set in real time by a DSP embedded signal processor under a stationary resolution and atransient resolution, and analyzing the frequency spectrum of the generating set; uploading the analysis result to an integral workstation for storage, and comparing the result with the preset electrical property evaluation criteria of the generating set to generate a test report. The invention has the advantages that the test load of the generating set is continuously adjustable; the output voltage and current signals are sampled by a complete period and analyzed by a discrete Forurier technology to rapidly response the change of effective value and acquire the frequency spectrum and the distortion parameters of total harmonic wave; the model number parameters of the generating set are identified automatically, the evaluation criteria of test data is selected automatically, and the testreport is generated automatically.

The invention discloses a distribution network single-phase grounding fault section positioning method and system. The method comprises a system control terminal and a plurality of online monitoring terminals which are arranged on a distribution line in a scattered manner and are in communication connection with the control terminal. The online monitoring terminals detect voltage and current of three single phases, and judge a fault phase according to an effective value of the voltage; fault recording is performed on voltage and current in a predetermined time interval containing a fault starting moment; three phases of current in fault recording are synthesized into zero-sequence current; and the system control terminal realizes judgment on whether monitoring points of a feeder are positively related or not through calculating and analyzing zero-sequence current values which are sampled, calculated and synthesized by the adjacent online monitoring terminals, and further judges a section in which the distribution fault point is located. The method disclosed by the invention is wide in application range and easy to implement, and does not need to configure a zero-sequence voltage transformer and a zero-sequence current transformer at monitoring points of a distribution network, so that the construction investment and maintenance cost of the system is saved, and problems such as electromagnetic resonance brought about by additionally arranging a voltage transformer on the feeder are solved at the same time.

The invention provides a circuit breaker breaking capacity evaluation method based on a full current equivalence principle, which belongs to the field of power grid safety stability and control. A concept of a full current effective value is introduced to evaluate the energy released by arcs of the circuit breaker during an arc extinguishing process; when short circuit happens to the power system, the short circuit current contains a periodic component and a DC component, a short circuit point DC component decay time constant in an actual operation working condition is solved; if the constant exceeds a circuit breaker standard decay time constant, evaluation on the circuit breaker short circuit current breaking capacity is carried out through a full current effective value equivalence principle in the circuit breaker actual operation working condition and a standard operation working condition; and finally, through comparing the circuit breaker breaking capacity and the short circuit current in the actual working condition, risk points existing in operation of the power grid are found out. The short circuit current actual breaking capacity of each type of circuit breakers can be effectively evaluated, and basis is provided for short circuit current suppression measure making and circuit breaker model selection in the power grid.

The invention relates to a high-accuracy multichannel alternating voltage and current detection device. A main engine detection circuit comprises a liquid crystal display module and a data collection detecting module. The data collection detecting module comprises a single chip microcomputer (SCM), a Hall voltage sensor, a Hall current sensor and an analog-digital (AD) switch integrated circuit, wherein an alternating current which is to be detected is input to the primary side of the Hall current sensor, an induced alternating current is output from the secondary side of the Hall current sensor and converted to a direct current signal with a current of 0-0.5 mA through the AD switch integrated circuit AD536A, then the direct current signal is sent to an SCM analog input port by resistance partial voltage and calculated and processed by an SCM procedure, a data processing result is transmitted to the liquid crystal display module through an SCM data interface and displayed on a liquid crystal display screen, and furthermore the data processing result is sent to an external control device through a serial port 232. An alternating current true virtual value is converted into the direct voltage signal by using the Hall components and the AD536A, and therefore detection precision is improved and circuit building work is simplified.

The invention aims to provide a system for monitoring the state of a harmonic load. The system is realized by a following method as follows: an everyday sample is established according to statistic characteristic quantity of historical data corresponding to the effective value of every-order harmonic current; a population sample in any time period is established according to the everyday sample; a normal cloud model of the effective value of the every-order harmonic current is established and converted to the boundary membership under a standard normal cloud model according to the statistic rule of the population sample, so as to establish a retrieval body of the harmonic current. By the system, the state of the harmonic load can be diagnosed and minored in real time according to the retrieval body of the harmonic current; the system is applicable to the occasion when the running state is abnormally small; and the method has a certain practical value in engineering.

The invention relates to a high frequency sin wave virtual value digital real-time detection technology, in particular to a high precision high frequency sin wave virtual value real-time detection method based on the field programmable gata array (FPGA) high-speed data processing technology. The method includes the steps of taking any one sampling point as a nth point from sampling points m in a cycle of sine wave, calculating sin wave virtual values from n to n+m-1, wherein the sampling amplitude is xi in a cycle, and calculating Sn+1, Sn+2, ..., Sn+m-1; taking a mean S of m virtual value data Si (i=1, 2... m) as a virtual value of the sine wave. The calculation error is little, the computing speed is fast, the scope of application is wide, and the virtual value detection of the sine wave which ranges from tens of KHz frequency to hundreds of KHz can be achieved by changing parameters.

The invention discloses a reactive optimization method for improving a qualified rate of a power distribution network comprising distributed photovoltaic power sources. The method mainly comprises the following steps: when the photovoltaic power sources work in an MPPT mode, by taking minimization of whole-network voltage deviations as a target, performing reactive optimization on residual capacities of photovoltaic inverters by use of a particle swarm algorithm; if an optimization result still comprises a node voltage off-limit condition, employing an improved optimization scheme: first of all, under the condition that it is ensured that whole-network voltages are qualified, by taking maximization of total active output of the photovoltaic power sources as a target, obtaining an optimal active value of each photovoltaic power source; and then by taking the result as an active output value of each photovoltaic power source and by taking the minimization of the whole-network deviations as the target, performing the reactive optimization on the residual capacities of the photovoltaic inverters again. According to the invention, operation economic benefits and reliability of the power distribution network are taken into integrated consideration, distribution of active and reactive output of the photovoltaic inverters is optimized, and the voltage qualified rate of the power distribution network comprising the photovoltaic power sources is effectively improved.

The invention discloses a control method and a system of a PFC circuit in an air conditioner and the air conditioner, wherein the method comprises the following steps: input current and input voltage of the PFC circuit are detected, and an effective value of the input current and a peak value of the input voltage of the PFC circuit are obtained; weak magnetic critical voltage of a compressor is calculated according to compressor parameters and operation parameters; and the opening and the shutoff of the PFC circuit are controlled according to the effective value of the input current and the peak value of the input voltage of the PFC circuit and the weak magnetic critical voltage of the compressor. The control method of the PFC circuit in the air conditioner can reduce the consumption of electric energy by the PFC circuit.

The invention provides a single-phase electric energy metering chip. The single-phase electric energy metering chip comprises a full-waveform module which is connected with a sampling and analog-to-digital conversion module, a fundamental wave separation module which is connected with the full-waveform module, an effective value calculation module which is connected with the full-waveform module and the fundamental wave separation module, an active power calculation module which is connected with the full-waveform module and the fundamental wave separation module, a reactive power calculation module which is connected with the full-waveform module and the fundamental wave separation module, an apparent power calculation module which is connected with the effective value calculation module, a power factor calculation module which is connected with the apparent power calculation module and the active power calculation module, an Nth-degree harmonic separation calculation module, and an energy calculation module. The single-phase electric energy metering chip can flexibly choose the calculation of the active power, the reactive power, the apparent power and the power factor of full-wave, fundamental wave and each harmonic and the electric energy metering of active, reactive and apparent energy.

The invention discloses a method for filtering a bill according to the status of the bill, which comprises the following steps: first, the label parameter of the bill status field is obtained from a preset bill metadata sheet; the label parameter is used to label the corresponding filter status of the bill status field; when the value of the label parameter is an effective value, the filter status information of the bill status field is obtained from a preset bill filter status sheet; the filter status information includes a filter status type and the metadata expression of the filter status type; the filter status type is added to a bill filter interface; finally, the filter status type selected by the user on the bill filter interface is obtained, and the corresponding metadata expression of the filter status type is taken as the filter condition. The method can reduce the development and maintenance cost of source code revision, and effectively improve the filter performance.