53results about How to "Guaranteed Conversion Accuracy" patented technology

This invention relates to a fault collection detecting apparatus and its method and the system comprises upper computer and down computer. The down computer adopts data collection board and is used to data collection of multiple-path spot and buffer and pre-process, while the upper computer adopts PDA and receives the sent data by the down computer through the serial port. The down computer realizes the whole spot monitor tasks, such as analog signal collection, AD conversion and simple data process part and controls the hardware scale and power consumption of the system. The upper computer realizes the further data process, spot real time analysis display element, history data re-display.

The present invention relates to a logging unit which can be used for measuring radioactive gamma energy spectrum naturally-existed in the borehole. Its technical scheme includes probe portion, mechanical structure portion and circuit portion, in which the mechanical structure portion mainly includes upper connector, external shell, power supply skeleton, circuit skeleton, scale mark and lower connector. The circuit portion mainly includes power supply plate, main control plate and PHA plate, the power supply plate is mounted on the aluminum alloy skeleton, and the main component of the probe portion includes a cesium iodide crystal, an optically-coupled piece and a photomultiplier, on the pins of photomultiplier are welded a voltage-dividing resistor and a filter capacitor, the described component is packaged in an aluminum metal cylinder, and the upper end of the probe is equipped with three lead-out wires which respectively are high-voltage power supply wire, signal output wire and grounding wire. The circuit composition of main control plate and PHA plate includes energy spectrum preamplifier circuit, energy spectrum communication interface, energy spectrum measurement and control circuit, pulse height analysis circuit and M5 data remote transmission control circuit. Besides, said invention also provides the concrete application field and range.

The invention discloses a two-step double-slope analog-to-digital converter and an analog-to-digital conversion method thereof. The converter comprises a coarse slope generation circuit, a fine slopegeneration circuit, a comparator, a coarse slope counter, a fine slope counter and a sequential control circuit. For the ADC, a rough range of an input signal is determined by comparing the input signal with a voltage value of a rough ramp, and several bits of high-order bit data of analog-to-digital conversion are determined at the same time; determining an integral initial level of the fine rampgenerator according to a result of the coarse ramp counter; the remaining low bit data of the analog-to-digital conversion is determined by comparing the input signal and the fine ramp integration signal. According to the invention, the conversion precision of the ADC can be ensured under the condition that only one coarse slope generation circuit and one fine slope generation circuit are used, and the problem that the conversion time of a traditional single-slope ADC is too long can be solved to a great extent.

The embodiment of the invention relates to a digital-to-analogue conversion circuit and method, a source driver and a display device. The digital-to-analogue conversion circuit includes a first digital-to-analogue conversion device and a second digital-to-analogue conversion device, wherein the first digital-to-analogue conversion device corresponds to high-bit m digits of a (m+2)-bit digital signal, the second digital-to-analogue conversion device corresponds to low-bit n digits, and the m and the n are both integers greater than zero. The first digital-to-analogue conversion device includes a voltage division module, a first voltage selecting module and an operation module, wherein the voltage division module is used for generating 2<m> reference voltages which have an equal gap voltage, the first voltage selecting module is used for selecting first voltages corresponding to the m digits from the 2<m> reference voltages, the operation module is used for generating second voltages from two adjacent reference voltages in the 2<m> reference voltages and the first voltages, and the gap voltage of the second voltages is greater than that of the first voltages. The second digital-to-analogue conversion device is used for using the first voltages and the second voltages as reference voltages, generating third voltages corresponding to the n digits and generating the sums of the third voltages and the first voltages.

A circulation analog-to-digital converter combined with a TDC (time-to-digital converter) is used for realizing two conversion steps of sampled analog voltage signals and comprises a circulation analog-to-digital conversion unit and a time-to-digital conversion unit. The circulation analog-to-digital conversion unit is used for performing the first data conversion step, quantizing the sampled analog voltage signals to acquire most significant bit and then sending residual voltage into the time-to-digital conversion unit. The time-to-digital conversion unit is used for performing the second data conversion step, converting the residual voltage into time signals to acquire the first least significant bit and the second least significant bit, and then adding the first least significant bit and the second least significant bit together to complete the two conversion steps. The circulation analog-to-digital converter combined with the TDC has the advantages that conversion rate is increased, conversion precision is guaranteed, power consumption is saved, quantization of analog signals is realized, requirements in actual application are met, requirements for sub circuits are reduced as compared with that of conventional single-circuit modules, and thus conversion is easy to realize on boards.

A linear power driving controller based on large-power operational amplifier for a three-phase alternating current motor consists of a linear power driving module, a signal detecting module, a digital control module and a digital-analogue (D / A) converting module. The signal detecting module detects a motor three-phase winding current signal and a motor rotor position signal, converts the signals into signals which can be directly received by the signal detecting module and transmits the signals to the signal detecting module. The signal detecting module finishes calculation of a control algorithm according to received motor state information and gives a digital quantity control signal. The D / A converting module converts the digital quantity control signal into an analog quantity control signal and transmits the analog quantity control signal to the linear power driving module. The linear power driving module isolates the analog quantity control signal and a power level signal, further performs power amplification, provides high voltage and large current for a motor winding and accordingly achieves high-precision control of the three-phase alternating current motor. The linear power driving controller has good application prospect in the technical field of electric motor automatic control.

The invention discloses a multifunctional positioning device and relates to the industrial machinery field. The multifunctional positioning device comprises a positioning device body, wherein the positioning device body is internally provided with a GSM antenna, a GPS antenna and a wireless WiFi, the GSM antenna can search telephone signals and can be used for carrying out help emergency processing, the GPS antenna facilitates to position location position, the wireless WiFi is for networking and enriches functions of the positioning device, a casing of the positioning device body is provided with an infrared detector utilizing reflection signals of light, height difference between a truck and a bridge opening can be calculated through a light conversion device, and the positioning device body is externally provided with an alarm device and a display panel, when the height difference is small than a warning scope, the alarm device emits prompt, processing measures can be timely and conveniently carried out, the display panel is convenient for integral control on all the functions, the positioning device body is further internally provided with the light conversion device, the alarm device is electrically connected with the display panel and the infrared detector, and the light conversion device is electrically connected with the display panel and the infrared detector.

The invention provides a satellite passive positioning method based on GPS broadcast data. The method comprises: acquiring measuring data of a satellite; according to the measuring data, calculating a conversion matrix M from an earth-fixed coordinate system to a satellite local system; selecting an earth ellipsoidal model and obtaining corresponding earth geometrical parameters and an earth ellipsoidal surface equation; and according to the conversion matrix M, solving an object position equation, and solving object position coordinates by simultaneously solving the earth ellipsoidal surface equation. The measuring data comprises the GPS broadcast data including a satellite real-time position P<se><-> and a speed V<se><->, object measurement angles beta<x> and beta<y> and attitude angle data, i.e., a pitch angle phi, a yaw angle yaw angle gamma and a roll angle theta, wherein the GPS broadcast data is obtained through a satellite data bus, the beta<x> and the beta<y> are obtained through a load subsystem, and the attitude angle data is obtained through an attitude orbit control subsystem. According to the invention, the high-precision GPS broadcast data is taken as a system input quality, such that the precision of each parameter during a calculation process is ensured, accordingly, the precision of a positioning result is ensured, at the same time, an offline processing process is unnecessary, and the satellite autonomous calculating capability is enhanced.

A vehicle includes a battery pack including a secondary battery and a first control device, a second control device provided separately from the battery pack, and a converter. The converter is configured to select a conversion formula from options depending on a situation and use the selected conversion formula to convert at least one of a first current upper limit value and a second current upper limit value into at least one of a first power upper limit value and a second power upper limit value.

The invention discloses a radioactive mineral geological exploration device. The invention is characterized in that the radioactive mineral geological exploration device comprises a ground portion and a downhole instrument portion; the ground portion is connected with the downhole instrument portion through a single-core or four-core cable; the ground portion comprises a receiving control panel and a power supply; the receiving control panel is electrically connected with the power supply; the downhole instrument portion comprises a telemetery and power supply unit, a temperature and pressure magnetic positioning unit, a natural gamma-ray spectrometry unit and an azimuth gamma-ray measuring unit; the natural gamma-ray spectrometry unit comprises a composite detector and a natural gamma-ray spectrometry circuit; and the composite detector is electrically connected with the natural gamma-ray spectrometry circuit. The invention has the significant characteristics of advanced technology, small size and powerful combined function, the low-voltage power supply adopts the power supply module of high reliability for centralized power supply and is mounted on an aluminum alloy skeleton at the upper portion of the instrument, unified management of the power supply is thus ensured, the length of the instrument is also effectively reduced, and the usefulness of the instrument is improved.

The invention relates to a vernier type high-precision and high-speed A / D conversion device. The vernier type high-precision and high-speed A / D conversion device comprises m conversion units, each conversion unit is used for A / D conversion of a segment of continuous number of bits, and the vernier type high-precision and high-speed A / D conversion device further comprises m-1 rounding-up switch groups, wherein the input end of each rounding-up switch group is connected with the conversion unit of the corresponding bit segment and is used for outputting a minimum voltage value outputted by a voltage dividing circuit and greater than a measured voltage in the conversion unit of the corresponding bit segment; m-2 rounding-down switch groups, wherein the input end of each rounding-down switch group is connected with the conversion unit of the corresponding bit segment and is used for outputting a maximum voltage value outputted by the voltage dividing circuit and smaller than the measured voltage in the conversion unit of the corresponding bit segment; and a data latch, wherein the input end is connected with digital signals output by the m conversion units in sequence according to thebit segments from high to low and is used for synchronously outputting the digital signals. Continuous refinement measurement is performed on the to-be-converted voltage by using verniers with different precision to improve the conversion speed while ensuring the analog-to-digital conversion precision.

The invention discloses a wireless data acquisition system for acquiring a voltage of a microbial fuel cell, which comprises a single-chip minimum system, an analogue-to-digital conversion module for inputting a microbial fuel cell voltage signal, and a global system for mobile communications (GSM) communication unit, wherein the single-chip minimum system is connected to the analogue-to-digital conversion module and the wireless communication unit, respectively. The system of the invention is low in volume, power consumption and cost, high in reliability, and adaptive to severe working environment; by adopting a high-accuracy analogue-to-digital converter, the conversion accuracy is guaranteed and accurate measurement on the voltage can be realized; and by adopting a GSM short message module for wireless data transmission, the acquisition data can be obtained in time and conveniently and automatic monitoring of a long distance can be realized; and a memory module and a universal serial bus (USB) communication interface are also adopted, so that the system can be connected to a computer through a USB cable to transmit the acquisition data at a high speed.

The invention discloses a method and a system for monitoring the residual capacity of a storage battery on line based on the internal resistance method. The method comprises the following steps of connecting a constant alternating current stabilized power supply to two ends of the storage battery, then acquiring an alternating voltage peak at the two ends of the storage battery and an alternating current peak flowing through the storage battery by a peak-holding circuit, detecting a phase difference between an alternating voltage signal and an alternating current signal through a phase detecting circuit, and finally, sending the acquired alternating voltage peak, alternating current peak and phase difference to a single chip microcomputer for data processing to obtain the residual capacity of the storage battery, and displaying the measured residual capacity of the storage battery in real time so as to realize real-time on-line monitoring on the residual capacity of the storage battery. By adopting the scheme disclosed by the invention, high-efficiency visual real-time intelligent on-line monitoring on the residual capacity of the storage battery is realized.

The invention discloses a high-precision digital-to-analog conversion device and method. The high-precision digital-to-analog conversion device comprises a control module, n conversion modules, an adder and a feedback module, wherein n is an integer greater than or equal to 2; the conversion coefficient of the conversion module is gradually increased; the control module is used for splitting an input digital signal into n intermediate digital parts, dividing the n intermediate digital parts by corresponding conversion coefficients to obtain n intermediate digital signals, and respectively transmitting the n intermediate digital signals to the n conversion modules; wherein the middle number part is increased step by step; the conversion module is used for performing digital-to-analog conversion on the intermediate digital signal to obtain a result containing a conversion coefficient; the adder is used for adding the output signals of all the conversion modules to obtain an analog signal; the feedback module obtains a feedback signal according to the analog signal; the control module adjusts distribution of the intermediate digital portion according to the target digital signal and the feedback signal. According to the embodiment of the invention, high-precision output of the digital-to-analog conversion device can be realized on the basis of ensuring low cost.

The invention discloses a novel computer oscilloscope which is orderly connected to a signal conditioning circuit, a master control circuit, and a PC machine. The signal conditioning circuit has an input signal interface. The master control circuit comprises a signal processing circuit and an analog to digital converter. The signal conditioning circuit carries out filtering, attenuation / amplification and level shift processing on an input signal. The analog to digital converter converts a processed signal into a digital signal. An oscilloscope display screen is a PC machine display screen. Through a simple circuit structure, the function of the oscilloscope can be realized, the novel computer oscilloscope has the advantages of high working stability, high reliability, no obvious waveform distortion, a high measurement frequency, a small volume and low cost, and thus the novel computer oscilloscope has a wide application value.

The invention provides a digital trusted instrument with a CAN interface. An external mechanical rotation angle variation quantity is transferred to a second automatic angle adjusting machine, and a fine channel angle digital quantity is obtained through an SDC module. The external mechanical rotation angle variation quantity is transferred to a first automatic angle adjusting machine through a speed reducer, and a coarse channel angle digital quantity is obtained through an SDC module. The coarse channel angle digital quantity and the fine channel angle digital quantity are subjected to coarse and fine combined operation of a single chip microcomputer, and a 17-bit trusted instrument position digital quantity is obtained. The trusted instrument position digital quantity is transmitted to a servo controller by a CAN bus driver module through a CAN data bus. A power supply module supplies power to the SDC modules, the single chip microcomputer and the CAN bus driver module. According to the digital trusted instrument, the direct influence on precision by excitation power supply interference is small, the conversion precision is ensured, and the calculation workload of a servo control computer is reduced.

The invention discloses a high precision image data acquisition and storage system based on low-pass filter. The high precision image data acquisition and storage system is characterized by mainly comprising a single chip microcomputer, an analog-to-digital conversion unit, a storage and a display which are connected with the single chip microcomputer respectively, a signal processing unit which is connected with the analog-to-digital conversion unit, and a signal collector which is connected with the signal processing unit. The high precision image data acquisition and storage system based on the low-pass filter provided by the invention can process an analog signal, so that the analog-to-digital conversion unit can convert the analog signal into a digital signal more quickly, thereby improving the data storage speed.

The invention relates to a reference elliptical projection plane coordinate system converting method based on identical central project longitude. First, an A reference elliptical projection plane coordinate system is converted to a B system based on the identical central project longitude through similarity transformation. Then, calculation to convert projection zone is made on the elliptical parameters in the B system for obtaining a required longitude plane coordinate system. According to the invention, geographic space data coordinate system conversion is facilitated, conversion technical difficulty is reduced and a problem of poor precision of a similarity transformation four parameter conversion model in a common two-dimensional plane is solved.

The invention discloses an analog-to-digital conversion module in a gas concentration detection system in a painting workshop, comprising a signal input circuit, a first resistor, a fourth resistor, a first capacitor, a transient voltage suppression diode, a voltage-frequency converter and a signal output circuit, wherein , the voltage-to-frequency converter adopts the LM331 chip, and its eighth pin is connected to a power supply. Both ends of the first resistor are respectively connected to the signal input line and the seventh pin of the voltage-to-frequency converter, one end of the first capacitor is connected to the line between the first resistor and the seventh pin of the voltage-to-frequency converter, and the other end of the first capacitor is grounded. One end of the transient voltage suppression diode is connected to the seventh pin of the voltage-to-frequency converter, and the other end is grounded. Both ends of the fourth resistor are respectively connected to the third pin of the voltage-to-frequency converter and the signal output line. When the invention is applied, the analog / digital conversion of the sensor detection signal can be realized, and the conversion accuracy of the detection signal conversion can be guaranteed.

The invention relates to the field of hardness testers, and particularly discloses a Vickers microhardness tester infinite imaging system which sequentially comprises an amplification imaging device, an independent hardness pressure head, a converter device, a reflection device, an infinite auxiliary optical system imaging device, an observation tube device and an imaging eyepiece from bottom to top along a light path, wherein the amplification imaging device is used for amplifying an image of a to-be-tested sample, the converter device is used for conversion between the amplification imaging device and the independent hardness pressure head, the reflection device is used for changing the direction of a light path amplified by the amplification imaging device, and the infinite auxiliary optical system imaging device is used for reversing a parallel transmission light path into an imaging light path. The observation tube device is used for dividing a light path into two parts which are respectively imaged in the imaging eyepiece, so that the problems that the installation sizes of the objective lens and the eyepiece are difficult to correct during assembly and the imaging quality and effect of the system are influenced due to the fact that the mechanical tube length size of a limited imaging system of a traditional table type microhardness tester is fixed and cannot be changed are solved.

The application provides a signal processing circuit comprising an amplifying module and an analog-to-digital conversion module. The amplifying module consists of a first input terminal for receiving an input signal, a second input terminal for receiving a reference signal, and an output terminal coupled to the analog-to-digital conversion module. The amplifying module amplifies the input signal and the reference signal and outputs an amplifying signal to the analog-to-digital conversion module through the output terminal; and the analog-to-digital conversion module carries out analog-to-digital conversion on the amplifying signal. A symbol of a first amplification coefficient for amplification on the input signal by the amplifying module is opposite to that of a second amplification coefficient for amplification on the reference signal by the amplifying module; and the voltage range of the amplifying signal is identical with the range of the analog-to-digital conversion module approximately. Therefore, the accuracy of analog-to-digital conversion can be improved; and costs can be lowered.

The invention discloses a pumping voltage detection and discharge circuit. The invention changes the conventional pumping voltage detection and discharge circuit and designs a novel pumping voltage detection and discharge circuit. The circuit can detect the power supply voltage stably and quickly and can filter out the unstable interference in the power supply. The pumping voltage detection and discharge circuit transmits a voltage signal to a single-chip microcomputer through an AD conversion chip and controls the single-chip microcomputer to output a PWM signal to control the interruption ofan MOS transistor, thereby quickly discharging the pumping voltage, and greatly enhancing the stability of the traditional pumping voltage detection and discharge circuit. The pumping voltage detection and discharge circuit disclosed by the invention comprises a single-chip microcomputer U4, a voltage sampling circuit, an optical coupler isolation circuit and a voltage discharge circuit. The circuit has the characteristics of high voltage sampling accuracy, long-time working stability, simple circuit structure, isolation function and simple circuit maintenance.

The invention discloses combined laser tracking and inertial surveying system for measuring position and gesture of space object composed of inertial surveying subsystem, laser tracking measurement subsystem, and computer control and data collection and process subsystem connected to the above said two systems. The invention is also discloses a dynamic tracking measuring method. Based on requirement of Kalman filtering algorithm, the method builds system equation and observation equation for moving target between fixed connected coordinate system and global coordinate, and edits expanded Kalman filtering algorithm for optimal modifying each error information. So as to calculate out information of position and gesture of target in fixed connected coordinate system related to global coordinate. The invention raises stability and measuring precision, and enriches output information measured.

The invention discloses a voltage frequency converter of a painting workshop gas concentration detection system. The voltage frequency converter comprises a signal input line, a first resistor, a second resistor, a fourth resistor, a first capacitor, a second capacitor, a transient voltage suppressor diode, a voltage frequency converter body and a signal output line. The two ends of the first resistor are connected with the signal input line and a seventh pin of the voltage frequency converter body respectively, one end of the first capacitor is connected with a line between the first resistorand the seventh pin of the voltage frequency converter body, and the other end of the first capacitor is grounded. One end of the transient voltage suppressor diode is connected with the seventh pinof the voltage frequency converter body, and the other end of the transient voltage suppressor diode is grounded. One end of a parallel branch formed by connecting the second resistor with the secondcapacitor in parallel is connected with a first pin of the voltage frequency converter body, and the other end of the parallel branch is grounded. The two ends of the fourth resistor are connected with a third pin of the voltage frequency converter body and the signal output line respectively. When the voltage frequency converter is applied, by achieving analog-digital conversion of a detection signal of a sensor, the conversion precision obtained when the detection signal is converted can be guaranteed.

The present invention relates to a cursor-type high-accuracy and high-speed A / D conversion apparatus. The conversion apparatus in the present invention comprises m conversion units, wherein each conversion unit is used for A / D conversion of a section of consecutive digits; and further comprises: m-1 rounding up switching groups, wherein an input end of each of the rounding up switching groups is connected to the conversion unit of a corresponding digit section, so as to output a minimum voltage value, which is output by a voltage dividing circuit, greater than a voltage to be measured in the conversion unit of the corresponding digit section; m-2 rounding down switching groups, wherein an input end of each of the rounding down switching groups is connected to the conversion unit of the corresponding digit section, so as to output a maximum voltage value, which is output by the voltage dividing circuit, smaller than the voltage to be measured in the conversion unit of the corresponding digit section; and a data latch, wherein input ends of same are successively connected to digital signals output by the m conversion units according to digit sections from high to low, so as to realize synchronous output of digital signals. By means of using cursors with different accuracies to continuously carry out refined measurement on a voltage to be converted, the accuracy of analog-digital conversion is guaranteed, and the conversion speed is improved at the same time.

The invention discloses a digital direct regulation direct current voltage stabilizing and regulating power supply. The power supply is a PWM switch power supply and controlled by a single chip microcomputer, and central voltage digital quantity is taken as a voltage stabilizing and regulating comparison reference. A main control signal is a high-frequency pulse signal with peak analog-digital conversion and gradual pulse instantaneous control. The power supply comprises a plurality of high-frequency controllable rectifier circuits, the output voltage is gradually decreased by the same rate, the gating is decided by the output voltage, the main control signal is taken out from the endpoint of a rectifier coil with the maximum number of turns, and the control precision is ensured by using large file size to simulate the control of small file size. A secondary control signal is taken out from the direct current of an output end, the timely inspection of A / D is carried out, the output voltage is compared with the central voltage, and the difference of the output voltage and the central voltage is used for determining the frequency of a micro-movement switch and slightly changing pulse duty cycle to correct the systematic errors. The power supply has small size, light weight, great power, high efficiency, stable voltage, small ripple, high quality, integrated stabilization and regulation and arbitrary regulation within a wide range at different places, thereby being the ideal power supply in the digital information age.