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3690 results about "Digital conversion" patented technology

Safety monitoring early warning and safety management system and method for oil gas extracting, gathering and transporting operation

The invention relates to a safety monitoring early warning and safety management system of oil and gas extraction and gathering operations as well as a method thereof, belonging to the technique field of safety production monitoring and supervision, and the system is composed of a monitoring center arranged at an oil and gas extraction safety monitoring and management department and a plurality of on-site monitoring terminals disposed at all oil and gas extraction operation areas. The method comprises: collecting and transmitting safety-related parameter signals, video signals and audio signals in real time; implementing the analog-digital conversion or signal conversion and compression coding to the signals; then transmitting the signals to all hosts of the monitoring center; processing and analyzing the received three types of signal information by all the hosts and then carrying out the parameter monitoring, video monitoring and audio communication respectively; and outputting the processed three types of information to the spot for being controlled correspondingly. The invention can realize the risk assessment, dynamic intelligent monitoring, safety state analysis, accident early warning and alarming, safety guarantee control and safety management of the whole process of operations ranging from oil and gas extraction, heating, separation processing, storage to transportation for oil and gas production enterprises.
Owner:CHINA ACAD OF SAFETY SCI & TECH

Pipeline leakage checking system

The invention discloses a pipe leakage detecting system, comprising a controller and a pipe leak detector, wherein, the controller processes and store data in the pipe leak detector through a wireless technology; the pipe leak detector also comprises a sensor, an amplifier, an analog-digital conversion module, a main processor, a GPS clock synchronization control module, a wireless communication module and a power supply module, wherein, the sensor is arranged on a pipe to be detected; the amplifier is connected with the sensor; the analog-digital conversion module is connected with the amplifier; the main processor is connected with the analog-digital conversion module; the GPS clock synchronization control module is connected with the main processor; the wireless communication module is connected with the main processor; and the power supply module is connected with the main processor. In the invention, sensors are arranged on the outer wall of the pipe at intervals and receive sound waves produced by leakage points on the pipe under the condition that GPS time service error is less than 200nS, thereby realizing high sensitive detection of the pipe leakage and high precise positioning of leakage sources. In addition, the pipe leakage detecting system is characterized by low cost, small volume, light weight, being portable and convenient operation.
Owner:CHINA SPECIAL EQUIP INSPECTION & RES INST +1

Sleep period separating method and system

The invention discloses a sleep period separating method and system. The method is applied to a sleep period separating system. The system comprises a first measuring electrode, a second measuring electrode, a first reference electrode, a second reference electrode, an amplification collector and a period separating device. The first measuring electrode is used for being placed on the left side of the forehead or the temporal hair-free region on the left side of a testee, the second measuring electrode is used for being placed on the right side of the forehead or the temporal hair-free region on the right side of the testee, the first reference electrode is used for being placed on the periphery of the left ear of the testee, and the second reference electrode is used for being placed on the periphery of the right ear of the testee. The method comprises the steps that the first measuring electrode and the second measuring electrode are utilized for collecting electroencephalogram signals and electro-oculogram signals of the testee, the signal amplification collector is used for amplifying the electroencephalogram signals and the electro-oculogram signals and carrying out analog-digital conversion on the amplified signals. The period separating device determines the separated sleep periods according to the analog-digital converted electroencephalogram signals and electro-oculogram signals.
Owner:河北宁博科技有限公司 +1

Method and device for full balance control of power battery of electric automobile

The invention discloses a method and a device for full balance control of a power battery of an electric automobile. In the method, an analog-digital conversion module of a microcontroller is used for acquiring single body voltage parameters of the power battery and sequencing the single body voltage parameters of the power battery; the microcontroller is connected with a battery management system to acquire dump energy information and battery balancing threshold of the current battery management system; and the method for the full balance control of the power battery of the electric automobile is implemented by the microcontroller according to the actual condition of the dump energy, or selecting an active balancing mode of starting an active balance control circuit and using an on-vehicle battery to charge the lowest battery single body, or selecting a passive balancing mode of starting a passive balance control circuit and using a balancing resistor to discharge the highest batterysingle body, or selecting a mixed balancing mode of using the two modes at the same time. By using the method and the device, a reasonable balancing strategy is established according to the dump energy of the battery, so that the problem of inconsistency of charge and discharge of the power battery is effectively solved and unnecessary electric energy consumption in balancing is effectively reduced.
Owner:QIMING INFORMATION TECH +1

Electric vehicle power battery insulation resistance detection method and device

ActiveCN102298092AAccurately measure the degree of leakageSolve the problem of not being able to judge whether it is positive leakage or negative leakageResistance/reactance/impedenceElectrical testingPower batteryElectrical battery
The invention discloses a method and a device for detecting power battery insulation resistance of an electric automobile. Two circuits of universal input/output interfaces of a micro-controller are respectively and externally connected with positive and negative insulation switch circuits. Positive and negative insulation switch relays are gated. Insulation resistance sampling voltage is output. The sampling voltage is amplified by an operational amplifying circuit, isolated by a voltage isolation chip and input in an analogue-digital conversion unit of the micro-controller. An insulation resistance value of a current power battery is calculated by the micro-controller according to an algorithm, transmitted to a battery management system through a communication module in the form of message and used by the battery management system. According to the method and the device disclosed by the invention, the problem that positive leakage, positive leakage or positive and positive leakage cannot be judged by the traditional insulation resistance detection device is effectively solved; the leakage degree of the current power battery can be precisely measured; and potential safety hazards resulted from inaccuracy of the insulation resistance are stopped.
Owner:QIMING INFORMATION TECH +1

Power battery SOC estimation method based on backward difference discrete model and system thereof

Provided is a power battery SOC estimation method based on backward difference discrete model and a system thereof; the method comprises the following steps: step one, establishing a backward difference discrete model of a power battery, identifying parameters of the backward difference discrete model by a least square method including forgetting factors; step two, on the basis of the backward difference discrete model of the power battery obtained in step one, using self-adaptive extended Kalman filter in combination with a non-linear relationship between an open-circuit voltage and the SOC to complete an effective estimation of the power battery SOC. In the system, voltage and current sensors connected with the power battery are connected with an embedded microcontroller via an analog-digital conversion module. The microcontroller comprises a low-pass filter pre-processing module, a backward difference discrete battery model parameter online identification module, and an AEKF algorithm SOC estimation module. The obtained SOC result is sent to a CAN network of a display device. The power battery SOC estimation system based on backward difference discrete model is simple in structure; the parameter identification speed and precision are increased; the affection to the identification caused by history data is reduced; the calculation is convenient; and the SOC estimation precision is high.
Owner:GUILIN UNIV OF ELECTRONIC TECH

Radio-frequency micro-capacitance fingerprint acquisition chip and method

The invention discloses a radio-frequency micro-capacitance fingerprint acquisition chip and method. The chip comprises a plurality of reference sensing units, a two-dimensional sensing unit array formed by the reference sensing units, an insulating layer, an insulating substrate serving as a finger contact surface, a radio-frequency signal generation circuit, a radio-frequency drive electrode, a sensing unit array controller used for providing bias-power-supply switching signals for switching on or switching off the sensing units and charge-discharge sequence signals needed by the sensing units, an analog-digital conversion array, a digital-analog converter for controlling the gain of the analog-digital conversion array, a sensing unit offset correction circuit, a fingerprint image cache, a fingerprint image output controller and an image signal processor. Due to the improvement of the structure of the sensing units and the additional arrangement of the sensing unit offset correction circuit, the radio-frequency micro-capacitance fingerprint acquisition chip can solve the problems of fingerprint residual, interference caused by other radiofrequency radiation, false fingers and small detection depth; besides, the chip can be embedded into a capacitive touch screen.
Owner:成都费恩格尔微电子技术有限公司 +1

Electromagnetic pen, electromagnetic touch receiving device and wireless communication system composed of electromagnetic pen and electromagnetic touch receiving device

The invention relates to the field of electromagnetic touch, and discloses an electromagnetic pen, an electromagnetic touch receiving device and a wireless communication system composed of the electromagnetic pen and the electromagnetic touch receiving device. In the electromagnetic pen, the electromagnetic touch receiving device and the wireless communication system, a wireless transmitter is arranged in the electromagnetic pen and used for collecting useful signals of the electromagnetic pen and sending the useful signals to the electromagnetic touch receiving device through electromagnetic waves after the useful signals are combined to form data frames and modulated. A wireless receiver is arranged in the electromagnet touch receiving device and used for receiving electromagnetic signals transmitted by the electromagnetic pen through an antenna array, conducting filtering on the received signals, and conducting analog-digital conversion on the received signals to obtain digital signals. Preprocessing, demodulation and frame decoding are conducted on the digital signals through the digital signal processing technology, and received bit data flow is obtained and outputted. According to the scheme, the useful signals are sent after being combined to form the data frames and modulated, information is transmitted without purely relying on frequencies, and therefore abundant information transmission can be conducted between the electromagnetic pen and the electromagnetic touch receiving device.
Owner:TELINK SEMICON SHANGHAI

Device and method for screen vocal control, and terminal

InactiveCN106126181AGood low frequency response performancePiezoelectric/electrostrictive microphonesSound input/outputDigital signalAudio signal
Embodiments of the invention disclose a device and a method for screen vocal control, and a terminal, and the device and the method are applied in the field of screen vocal technique. The device for screen vocal control comprises a digital signal processor, a coder-decoder, a frequency divider, an amplifier, a driver, a motor, and a middle frame. The digital signal processor is used to perform analog-digital conversion processing on audio signals, to obtain digital signals. The coder-decoder is connected with the output end of the digital signal processor, and decodes digital signals to obtain decoded signals. The frequency divider is connected with the output end of the coder-decoder, and obtains high-frequency signals and low-frequency signals in the decoded signals. The amplifier is used to perform amplification processing on the high-frequency signals. The driver is connected with the output end of the amplifier, and drives a display screen to vibrate to sound. The motor is connected with the low-frequency signal output end of the frequency divider. The middle frame is connected with the motor, and the motor drives the middle frame to vibrate, so that the middle frame drives the display screen to vibrate and sound. Using the device and the method can ensure good low-frequency response effect of a screen vocal terminal.
Owner:YULONG COMPUTER TELECOMM SCI (SHENZHEN) CO LTD
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