43results about How to "Short diagnosis time" patented technology

The invention discloses an open-circuit fault diagnosis method for the drive system of a double-winding fault-tolerant permanent-magnet motor. According to the method, the collected phase current of a motor is respectively subjected to the converting and processing process by a low-pass filter, a Clarke convertor, a Park vector processor, a normalization processor, an average value calculator, an absolute value calculator and an absolute value averaging processor, so as to obtain the average value of the normalized phase current of the motor and the average value of the absolute value of the normalized phase current of the motor. With the average value of the normalized phase current of the motor and the average value of the absolute value of the normalized phase current of the motor as a basis, fault diagnostic variables for the system are constructed, so that the open-circuit fault of the drive system of the double-winding fault-tolerant permanent-magnet motor can be detected and positioned in real time. Based on the above method, no extra current sensor is required, so that the method is simple, feasible and high in reliability. Based on the combined utilization of the average value of the normalized current and the average value of the absolute value of the normalized current, the incorrect diagnosis caused by load sudden change and other reasons during the conventional diagnosis process can be avoided. Meanwhile, the diagnosis time is greatly reduced. Therefore, the open-circuit fault of the drive system can be effectively detected and positioned in real time.

The invention relates to a method for on-line detecting the faults of photovoltaic cells in a solar photovoltaic power station. Two controllable switches are respectively connected in series and parallel with the output ends of each cell module in a photovoltaic cell module matrix. A short-circuit current sampling resistor is connected in series with the branch of the parallel controllable switch, and a remote control system controls the two controllable switches of each solar photovoltaic cell, carries out short-circuit test and detection on each cell module needing to be tested, acquires the short-circuit current of the photovoltaic cells by means of the short-circuit current sampling resistors, and judges whether the cell modules have faults according to the short-circuit current. The method can diagnose the faults of one or more photovoltaic cells already mounted in the photovoltaic power station, and also can carry out timed tour inspection, the detection time is short, and the safety of the solar photovoltaic power station system is greatly enhanced.

The invention discloses an open-circuit fault diagnosis method for switch tubes of a single-phase cascaded H-bridge rectifier. According to a system switch control signal and alternating-current sidecurrent polarity, switch functions under normal operation and different switch tube faults are calculated; and an output current calculation model and a state estimation model of a single-phase cascaded H-bridge rectifier module are obtained according to circuit topology of the cascaded H-bridge rectifier, and a calculated value and an estimated value of an output current are obtained. Based on characteristics that fault features of current residuals of different modules are separated and different fault diagnosis variables are mutually independent, any faulted switch tube can be positioned bycomparing the diagnosis variables with a self-adaptive detection threshold value. According to the method, the real-time diagnosis of the single-phase cascaded H-bridge rectifier in one or more switch tube fault states in an on-line real-time system can be realized, and the influence of network voltage fluctuation, load variation and operation condition change of the single-phase cascaded H-bridge rectifier is avoided; and moreover, the diagnosis time is short, the faults can be isolated in time, and the occurrence of secondary faults of the system is avoided.

The invention relates to a detection kit for diagnosing tuberculosis, comprising a recombinant antigenic protein, wherein the recombinant antigenic protein is the fusion protein obtained by connecting ESAT-6 (early secreting antigen target 6KD), CFP-10 (cultufiltrate protein 10KD), and MPB64 (Mycobacterium bovis 64KD) by connecting peptides according to an arbitrary sequence, wherein the connecting peptides are short peptides which do not influence the immunogenicity of ESAT-6, CFP-10 and MPB64. Preferably, the recombinant antigenic protein in the detection kit for diagnosing tuberculosis is the antigenic protein with an amino acid sequence which is SEQ ID: No.1. When the detection kit in the invention is used for diagnosing tuberculosis, the diagnosis time is short, the diagnosis is fast, the sensitivity is strong, and the specificity is high; and the detection kit has an important significance on early diagnosis of tuberculosis.

The invention discloses a cascaded H-bridge converter fault diagnosis method based on a voltage residual. The method comprises the following steps of step1, according to a system switch control signaland an alternating current side current polarity, acquiring switch functions under a normal condition and different switch tube faults; step2, obtaining a single-phase cascaded H-bridge converter input voltage calculation model and a state estimation model of a corresponding module; step3, obtaining theoretical analysis values of a voltage residual under the different faults; and step4, accordingto the theoretical analysis value of the voltage residual, designing two types of counters to obtain a maximum positioning fault module, and further determining the fault switch tube through combining a switch signal. The method can be integrated into a controller, real-time performance is good, and real-time diagnosis of the single-phase cascaded H-bridge converter fault module and an open-circuit fault switch is realized.

A memory diagnosis apparatus include an intra-word testing unit that tests for a coupling fault in each bit in each word in a memory, an inter-word testing unit that tests for a coupling fault between words in each sub-array each being plural words in the memory, and an inter-block testing unit that tests for a coupling fault between sub-arrays in the memory.

The invention discloses a biosensor based on an aptamer and a manufacturing method and application thereof and belongs to the field of biochemical technique. According to the biosensor based on the aptamer, n-octadecyl mercaptan is automatically assembled on a gold film, the n-octadecyl mercaptan is combined with carboxyl group graphene oxide through intermolecular force, activating treatment is carried out on the carboxyl group graphene oxide to enable carboxyl to be converted into an active ester group, and an amido bond is formed through the active ester group and amino acid on molecule of the aptamer to enable the aptamer to be fixed on the surface of the carboxyl group graphene oxide. According to the biosensor based on the aptamer, the electrochemical activity is good, the aptamer can be well fixed, and the biosensor can be used for detection of various kinds of target protein and can be applied to the fields such as biomedicine, food safety and environmental monitoring. The manufacturing method of the biosensor based on the aptamer is simple and easy to operate. Due to the fact that hydroxyl and epoxy group which are on the graphene oxide are converted into the carboxyl due to the adoption of NaOH and ClCH2COONa, the COOH functional group content is high, the good electrochemical activity is achieved, and the aptamer can be well fixed.

A hybrid system is developed using thermal and electrical impedance imaging methods together. The innovation of the approach relies on the frequency dependence of the tissue's electrical impedance which facilitates the acquisition of multiple thermal images with currents at different frequencies injected to the region of the body under inspection. Proposed method without current application (in passive mode of operation) provides images which are obtained by standard thermal imagers. On the other hand, the application of the electrical current (in active mode of operation) increases the temperature contrast on the body surface depending on the electrical property of tissue. Therefore, the technique while increasing the thermal contrast provides frequency dependent conductivity distribution data which can be used as a basis for the detection of the breast carcinoma. The sensitivity of the technique is increased by an infrared camera with dual band (MWIR/LWIR) imaging capability.

The invention belongs to testability technologies, and relates to a digital-analog hybrid circuit BIT device based on boundary scan. The device is composed of a link scanning module, a boundary scan controller, a master controller, a test vector storage and a tested digital-analog hybrid circuit, the boundary scan controller and the master controller are needed in scan test execution, the test vector storage is loaded with test vectors, the device can achieve a BIT based on the boundary scan according to the characteristic of a digital-analog hybrid complex circuit, and therefore the test problem caused by the structure and cross link complexity of the digital-analog hybrid circuit can be effectively solved, and universal and reliable testability design is provided for the device. The fault detection and locating of the circuit can be facilitated, testing efficiency and reliability are improved, development and maintenance cost is lowered, and operational effectiveness and overall economic benefits are improved.

The invention discloses an open-circuit fault diagnosis method for a dual-active-bridge DCDC converter. The method specifically comprises the following steps of: calculating the switching function of two H bridges of the dual-active-bridge DC-DC converter according to a system driving pulse signal and the polarity of primary side inductive current; calculating an inductive current state estimation model of the dual-active-bridge DC-DC converter according to the circuit topology and the working principle of the dual-active-bridge DC-DC converter; and designing a fault diagnosis algorithm according to inter-bridge-arm voltage characteristics and current residual characteristics under the fault. According to the method of the invention, monitoring of the working state of the dual-active-bridge DC-DC converter and rapid and accurate diagnosis under different switching tube faults are realized, and a new diagnosis idea is provided for the fault diagnosis technology of the dual-active-bridge DC-DC converter.

The invention discloses a fault diagnosis method of a permanent magnet fault-tolerant motor driving system. The method comprises the steps of firstly, constructing a permanent magnet fault-tolerant motor driving system, and completing construction of all modules and integration of a whole driving system; then collecting each phase of current of the two sets of armature windings, obtaining each phase of high-frequency current signal through a filter, and injecting a high-frequency square wave current signal into the d axes of the two sets of armature windings to obtain q-axis high-frequency voltage response; carrying out amplitude extraction on the q-axis high-frequency voltage response and the high-frequency current signals of each phase to obtain corresponding amplitudes, and carrying outmotor winding open-circuit fault diagnosis according to a motor winding open-circuit fault diagnosis criterion of the permanent magnet fault-tolerant motor driving system; and finally, according to the motor winding open-circuit fault positioning criterion of the permanent magnet fault-tolerant motor driving system, positioning a specific position where a fault occurs. The method is simple and easy to implement, high in reliability and short in fault diagnosis time, and the stability and robustness of the motor driving system are improved.

The invention relates to a quantitative diagnosis method for the short circuit in a battery based on voltage and electric quantity outlier coefficients. The method comprises the following steps: 1), acquiring voltage, current and charging time data of each single battery in the charging process of a power battery on line; 2), respectively calculating a voltage outlier coefficient and an electric quantity outlier coefficient of each single battery in each cyclic charging process; 3), based on the voltage outlier coefficient and the electric quantity outlier coefficient, determining whether the internal short circuit occurs in the power battery and positioning the single battery in which the internal short circuit occurs; and 4), quantitatively calculating the short-circuit resistance value of the single battery with the internal short circuit. Compared with the prior art, the method has the advantages of simplicity and convenience in implementation, short diagnosis time, high diagnosis accuracy and the like.

The invention belongs to the technical field of power electronic equipment fault diagnosis and fault ride-through, and relates to a sensor fault comprehensive diagnosis and ride-through method of a modular multilevel converter. The method comprises the following steps: detecting and locating the fault of an alternating current output side current sensor by comparing the measured value of the alternating current output side current sensor with an output current reference value; detecting and positioning the fault of the bridge arm current sensor by comparing the switching state of the previous control period, the charging and discharging condition of the sub-module capacitor and the measured value of the bridge arm current sensor; and detecting and positioning faults of the sub-module voltage sensors by comparing difference values of the different sub-module voltage sensors on the same bridge arm. Fault diagnosis and fault ride-through of the MMC sensor are realized, rapid and accurate detection and positioning of multiple sensors and multiple types of sensors are realized on the basis of not increasing the original MMC topological structure, and fault ride-through of the multiple sensors and the multiple types of sensors can be completed at the same time, so that the MMC can operate stably for a long time in a sensor fault state.