38results about How to "Achieving Synchronous Sampling" patented technology

The invention discloses a PCI interface protocol based array expandable data collection system realized by adopting an FPGA (field programmable gate array). The system comprises a plurality of identical analog signal collection boards. Each of the boards comprises a controller module, a multipath ADC module, a power supply module and a PCI bridging chip, wherein the controller module is composed of an FPGA chip and an SRAM chip, and used for controlling the sampling process, generating between-board bus signals and controlling caching and transmission of data; the multipath ADC module is composed of 64 paths of single-path ADC modules with the same structure, and used for converting analog signals into digital signals and transmitting the data to the controller module; the power supply module is composed of two identical power supply sub-modules, and used for providing stable and low-noise power for the chips; and the PCI bridging chip is used for realizing communication between the analog signal collection boards and an upper computer through a PCI bus. The PCI interface protocol based array expandable data collection system realizes sampling control of a multipath ADC and control of data flows by using the FPGA, and greatly increases the flexibility and the reliability of the design.

The invention discloses a satellite ground micro-vibration test system. The satellite ground micro-vibration test system comprises a high-sensitivity sensor used for extracting vibration signals near a disturbance source or a load, an anti-aliasing filter used for performing anti-aliasing filtering on the vibration signals extracted by the high-sensitivity sensor to form piezoelectric signals, a high-modulus conversion rate acquirer used for generating the piezoelectric signals into digital signals and a high-precision controller used for controlling display, storage and analysis of the digital signals. According to the invention, the high-sensitivity sensor realizes small-magnitude acquisition of the vibration signals, digital signals are generated through a high-precision data acquisition card after the vibration signals are subjected to the anti-aliasing filtering, and subsequent process is performed to provide efficient input for the subsequent satellite vibration reduction or vibration isolation and environmental test and also realize verification of vibration reduction or vibration isolation performance. Therefore, the satellite ground micro-vibration test system, disclosed by the invention, has the advantages of satisfying demands on acquisition and analysis of micro-vibration signals and being of great importance in improving control precision and stability of a satellite platform.

The invention discloses a power battery high-precision data synchronous collecting and real-time processing system and a method of power battery high-precision data synchronous collecting and real-time processing. The power battery high-precision data synchronous collecting and real-time processing system comprises a plurality of data collecting machine boxes. Each data collecting machine box comprises a monomer voltage collecting module, a monomer temperature collecting module and a data summarizing module. The number of the monomer voltage collecting module and the monomer temperature collecting module is in free combination. Collected corresponding data of a monomer battery is transmitted to the data summarizing module. The data summarizing module summarizes and caches all collected monomer battery data and uploads to an upper computer for storing. According to the power battery high-precision data synchronous collecting and real-time processing system, module design is adopted, the expandability is good, according to the needs, the number of sampling channels can be increased and decreased, the types of the sampling channels can be selected, and flexible system deploying is achieved.

The invention relates to the field of intelligent transformer substation sampling, in particular to a combined electronic transformer, which comprises a main control unit, a voltage transformer, a current transformer, a power supply and an A/D (analogue-to-digital) conversion module, wherein the voltage transformer and the current transformer are connected with the A/D (analogue-to-digital) conversion module respectively; the inside of the main control unit is provided with a hardware simultaneous signal sampling module, a high pass filter (HPF), a digital integral module, and a digital signal output port; and the hardware simultaneous signal sampling module acquires the sampling values of each phase of current and voltage at the same time and performs analogue-to-digital conversion by the A/D (analogue-to-digital) conversion module. The combined electronic transformer has the advantages that: by combining the analogue quantities of the voltage, the current and the like in the same electronic transformer, the transformer realizes the synchronous sampling of digitalized sampling signals and reduces the manufacturing cost of a combined transformer.

The invention provides a coal mine power grid line impedance estimation system. The coal mine power grid line impedance estimation system comprises a signal collecting device, a looped network access device, a network topology generating device, a data validity verification device and an impedance estimation device, wherein the signal collecting device is used for synchronously collecting and processing voltage and current signals of a coal mine power grid explosive-proof switch which is connected with the signal collecting device, the looped network access device is used for connecting the signal collecting device with the data validity verification device through an optical fiber Ethernet loop network, the network topology generating device is used for generating network topology information, the data validity verification device is used for performing synchronism and reasonability processing on collected data, and the impedance estimation device is used for estimating verified data by combination with the network topology information so as to figure out impedance of each line of a coal mine power grid. The working method mainly includes system synchronization timing, signal collection, validity judgment, impedance estimation and the like. By means of the coal mine power grid line impedance estimation system and the working method thereof, the credibility of estimation results of line impedance of the coal mine power grid can be improved, and scientific and reasonable supporting data can be provided for setting calculation of short-circuit protection in coal mine relay protection.

The invention relates to a measuring device and method for measurement errors of an electric measurement meter in the frequency fluctuation process. The measuring device for the measurement errors of the electric measurement meter in the frequency fluctuation process comprises a control system, a meter position of a meter to be measured, a power source, a standard meter, a frequency control unit and a frequency conversion unit. The measuring device is used for accurately measuring the measurement errors of the electric measurement meter when signal frequency fluctuates in a set mode, the frequency of voltage and current signals output by the device can fluctuate in the artificially set mode, and the standard meter of the device can achieve complete synchronous sampling under the signal conditions of frequency fluctuation. The invention provides a measuring method based on the measuring device, and the measuring method is used for measuring the measurement errors of the electric measurement meter in the fluctuation process of the voltage and current signals. The measuring device and method are suitable for measuring the measurement errors of the electric measurement meter in the fluctuation process of the voltage and current signals.

The invention discloses a fault indicator energy management method, which comprises the steps of: installing three fault indicators on three-phase lines separately; calculating a relative time drift and an initial time drift between the fault indicator to be synchronized and the master synchronization fault indicator; optimizing transmission power of the fault indicator serving as a wireless data transmitter; and selecting the cluster head fault indicator which receives sampling information of the non-cluster-head fault indicators, carrying out time synchronization on time marks of sampling points, and judging whether a fault occurs by utilizing the synchronized sampling information of the non-cluster-head fault indicators, sampling information of the cluster head fault indicator and a fault judgment algorithm. The fault indicator energy management method improves the accuracy rate of fault judgment of the fault indicators, greatly reduces the communication power consumption of the fault indicators, solves the problem of high failure false alarm and missed alarm rate of an existing fault indicator, and greatly enhances the feeder automation level.

The invention relates to a main switch shift adjustment controller of a 400-V power distribution system and an adjustment control method thereof. The invention relates to main switch shift adjustment control of a 400-V power distribution system, especially to a dedicated device for solving problems of main switch over-load current fixed value setting and control problems on the condition of large load changing and an adjustment control method thereof. The controller comprises a current setting unit, a current acquisition unit, an alarm display unit, a switching control unit, and a central processing unit; and the central processing unit is connected with the current setting unit, the current acquisition unit, the alarm display unit, and the switching control unit. Under the circumstance that power of the system is not interrupted, primary current fixed-value setting of the main switch is carried out; and according to a relationship between a practically measured primary current and upper and lower limit thresholds, the switching control unit controls switching of the switch, so that a problem of setting of the main switch over-load current fixed value on the condition of large load change can be solved.

The invention discloses a power distribution terminal based on a ColdFire architecture. The power distribution terminal comprises a Coldfire processor, a three-remote functional module and a transceiver with a built-in high-precision IEEE (Institute of Electrical and Electronics Engineers) 1588 clock, wherein the Coldfire processor is connected with the three-remote functional module, and the Coldfire processor is connected with the transceiver. Circuit protection and network distribution three-remote functions are integrated in the power distribution terminal, the synchronous sampling and control on voltage and current in eight loops are realized, and intelligent power distribution and protection functions are realized. The power distribution terminal has the functions of a universal distribution network automation terminal. A high-precision synchronization function is realized through the adoption of the transceiver with the built-in high-precision IEEE 1588 clock.

The invention discloses an alternating-current parameter measuring device which comprises a synchronization pulse generating circuit, a multi-channel filter compensation circuit, a phase forming detection circuit, a synchronization analog-to-digital conversion circuit and an MCU. The synchronization pulse generating circuit is connected with three-phase six-path input and output sampling voltages so as to obtain other detection synchronization pulses, the multi-channel filter compensation circuit is connected with multi-path three-phase voltages and currents so as to conduct filter compensation on input voltages and currents and then output the three-phase voltages and currents, the phase forming detection circuit is connected to the output end of the multi-channel filter compensation circuit to form the phase difference output of the three-phase voltages and currents, the synchronization analog-to-digital conversion circuit conducts synchronization analog-to-digital conversion on six-path phase difference signals and then obtains digital signal output of phase differences, and the MCU is connected with the synchronization analog-to-digital conversion circuit and processes the phase differences of the input digital signals to obtain the three-phase precise phase differences and in-phase current and voltage precise phase differences. According to the device, instantaneous and rapid synchronization sampling measurement on the three-phase current and voltage signals is achieved, and alternating-current parameters are precisely and effectively measured.

The utility model relates to an FPGA-based multi-channel analog signal synchronous sampling circuit system, which consists of a plurality of 32-channel signal acquisition daughter cards, a synchronoussignal acquisition card and an ATM network module, and is characterized in that the synchronous signal acquisition card sends clock synchronous signals to the 32-channel signal acquisition daughter cards through an RS422 bus; the synchronous signal acquisition card and the 32-channel signal acquisition daughter cards perform data exchange through a high-speed serial port RapidIO, and the whole system can perform data transmission with an external system through the ATM network module. According to the invention, each 32-channel signal acquisition daughter card can synchronously acquire 1-32 paths of front-end sensor analog signals, and eight 32-channel signal acquisition daughter cards can realize synchronous sampling of 256 paths of front-end sensor analog signals of the whole system under the control of the synchronous signal acquisition card. According to the invention, the FPGA is used as a core, the functions are designed in a modular manner, the flexibility is combined, the sampling precision is 16 bits, and engineering application can be realized in sonar, mechanical vibration analysis, engine testing and other occasions.