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  • 2021-01-27
    Research on LVDT Linear Displacement Sensor Based on AD598 Signal Processing Chip
    In an information acquisition system, the sensor is usually at the front of the system, the first of the detection and control systems. It provides the raw information necessary for system processing and decision making. Therefore, the accuracy of the sensor is critical to the overall system. In the measurement of displacement, velocity and acceleration, the differential transformer type sensor is often used because of its high sensitivity, good linearity and supporting integrated circuits, but the traditional LVDT sensor requires too much stability and accuracy for the working power supply, and Most of the circuit boards are made up of separate components, which are prone to looseness and moisture deterioration, which affects the service life and overall performance of the sensor. This paper introduces an LVDT linear displacement sensor based on AD598 signal processing chip, and discusses its error and precision by examples. 1 Basic principles A differential transformer type sensor is a device that realizes measurement by utilizing changes in the self-inductance or mutual inductance of a coil, and its core is a variable self-inductance or a variable mutual inductance. The variable air gap differential transformer type inductive sensor used in this paper uses the change of mutual inductance to work. 1.1 Basic structure and working principle There are one excitation coil and one output coil on the upper and lower iron cores. The upper and lower excitation coils are connected in series and then connected to the AC excitation power supply voltage Uin, and
  • 2021-01-26
    Flexible fingerprint sensor is expected to realize embedded security access control
    According to the James Consulting, researchers from the Belgian Microelectronics Research Center (IMEC) and the Dutch Applied Science Organization (TNO), the Holst Center researchers showed a test for detecting fingers. New flexible, large area sensor technology for palm prints. With a thickness of less than 0.2 mm and no large prisms or moving parts, the new sensor can be embedded in objects such as mobile phones and door handles to create an "invisible" but secure access control system that recognizes that the scanned object is alive rather than a phantom. Or a fake person. The technology paves the way for low-cost sensors for large-area finger and palmprint scanners, which will be on display at the Information Display Association (SID) 2018 Display Week Innovation Zone in Los Angeles, USA, and will be in Belgium. The IMEC Technology Forum (ITF) in Antwerp is on display. The two demonstration machines will demonstrate the technological potential for high resolution and large area effective detection areas. Among them, the 6 x 8 cm, 200-ppi demonstration machine is large enough for the 4-finger scanners currently used by border management and provides adequate image quality for basic identification applications. At the same time, the slightly smaller 500 ppi demonstration machine provides higher image quality, meets FBI standards, and is sufficient for law enforcement agencies to visualize details and pores for more powerful identification. Like the Holst Center's early flexible X-ray detectors, this fingerprint sensor combines an organic photodiode front panel, an oxide thin film transistor (TFT) backplane (originally developed for
  • 2021-01-15
    Automatic transmission control unit, solenoid valve, vehicle speed sensor, transmission oil temperature sensor circuit
    Circuit diagram of automatic transmission control unit, solenoid valve, vehicle speed sensor, transmission oil temperature sensor
  • 2021-01-15
    Continental launches advanced sensor solutions designed to further increase control to reduce engine emissions
    To make modern direct injection (DI) combustion engines meet strict emission regulations, higher levels of exhaust aftertreatment are an indispensable and important condition: converting nitrogen oxides (NOx) into harmless substances and from the exhaust stream. Filtering out gasoline and diesel particulate matter (PM) is a core function of the car. Continental has recently introduced advanced sensor solutions designed to further enhance control, enabling exhaust aftertreatment to meet vehicle emission standards in China and around the world. The post-processing system is equipped with Continental's intelligent high temperature sensor (HTS) and differential pressure sensor (DPS) for fast response and high precision measurement. At present, intelligent high temperature sensors are now in the second generation, helping customers save system cost and manpower. Mr. Fan Mingxiang, Sales Director of Continental's Sensors and Actuators business unit in China, said: [From a global perspective, the post-processing market is a promising market, and we have seen China's particularly strong demand. To meet these needs, Continental continues to We are developing new technologies to reduce emissions. We are proud to be able to deliver our second generation of high temperature sensors and differential pressure sensors to the Chinese market to help our customers meet emission standards reliably and efficiently." Intelligent High Temperature Sensors (HTS) The currently established diesel exhaust cleaning method requires a diesel particulate filter (DPF), a diesel oxidation catalyst (DOC), and a selective catalytic reduction (SCR) unit for the conversion of nitrogen oxides. Complex po
  • 2021-01-04
    Linear displacement sensor for non-contact displacement measurement
    Today, manufacturers of plastic processing equipment use a low-cost linear linear potentiometer for displacement measurement and control, but this equipment will experience severe wear and tear after a long period of use, resulting in linear deviation, causing users The consequence is that it costs a lot of money to repair and suffer serious losses from production stoppages. Balluff's engineers have developed the Micropulse-AT linear displacement measurement control system that is optimized for cost savings. The new Balluff Micropulse-BTL 5 unit has a rounded housing. The resolution of this displacement sensor is ≤10mm, and the repeating positioning accuracy is ≤20mm when the measuring range is 50-1500mm. The Micropulse-AT unit with IP67 enclosure rating is placed in an anodized aluminum hermetic housing. In this way, the system can be protected against dust, water and vibration and shock. This rounded housing and its many advantages provide ease and flexibility for installation. It can be attached to any part of the machine. As long as the vertical distance between the positioning magnet and the sensor does not exceed 8 mm, the possibility of damage to the displacement measuring system due to lateral force and signal interruption can be eliminated. The magnet can be placed with a vertical deviation of ±5 mm. Balluff displacement sensors can be fixedly mounted using standard components commonly used on the market. Because the displacemen
  • 2021-01-02
    Research on omni-directional transport platform control system based on kinect sensor
    Abstract: This paper designs a somatosensory interactive control system for the Meinham wheel omnidirectional walking transport platform. The system uses kinect sensor to propose two kinds of control methods: bone motion information recognition and depth gesture recognition based on different scenes. Based on the skeletal motion information recognition control method, the human body depth image data is acquired by kinect, then the bone tracking technology is used to extract the joint points of the human body, and the spatial coordinate system is established. Finally, the vector joint calculation method is used to calculate the rotation angle of the human body to realize the dynamic motion recognition. Convert to control instructions for platform control. Based on the depth gesture recognition control method, the depth information acquired by the kinect is used to realize the hand segmentation from the background, and then the template matching method is used to recognize the gesture conversion into the control command to realize the platform control. Experiments show that the control system can effectively and flexibly control the all-round transportation platform. This article refers to the address: http:// With the advancement of technology, people have been working on the research of convenient and efficient transportation institutions. The omni-directional motion mechanism achieves a high degree of flexib
  • 2020-12-24
    What is the principle of absolute encoder? What is the difference between incremental and absolute?
    An encoder is a device that compiles and converts a signal (such as a bit stream) or data into a signal form that can be used for communication, transmission and storage. According to its working principle, it is divided into two categories: incremental and absolute. There are three main differences, as follows: 1.Different principles The incremental encoder converts the displacement into a periodic electric signal, and then converts this electric signal into a counting pulse, and the number of pulses is used to indicate the magnitude of the displacement. There are many engraved lines on the code disc of the absolute encoder to arrange each position on the encoder. Since each position is different, if you want to know the magnitude of the displacement, you only need to know the starting position and the ending position, and you don`t need to keep counting like an incremental encoder. To describe it as pouring water, an incremental encoder is like finding a cup of unknown size and pour water into it. When it is full, empty the cup once, then pour water, and finally calculate the distance based on the number of times the cup is filled. An absolute encoder is like finding a taller cup with a scale, pour water into it, and finally calculate the distance based on the start and end scale. There is a problem. What to do if the cup is full? The solution is to find a larger cup with graduations, pour the water in the small cup into the large cup, and finally add up to calculate the distance. Thi
  • 2020-12-18
    Linear displacement sensor working principle and troubleshooting methods
    The working principle of the linear displacement sensor is the same as that of the sliding varistor. It is used as a voltage divider and it shows the actual position of the measured position with relative output voltage. There are the following requirements for the operation of this device: First, if the electronic ruler has been used for a long time, and the seal has been aged, mixed with a lot of impurities, and the water mixture and oil will seriously affect the brush's contact resistance, so that the displayed figures will constantly jump. At this time, it can be said that the electronic scale of the linear displacement sensor has been damaged and needs to be replaced. Second, if the capacity of the power supply is very small, there will be many situations. Therefore, the power supply needs sufficient capacity. Then, if the capacity is insufficient, the following situation will occur: the movement of the melted plastic will cause the display of the molded electronic ruler to change, and there will be fluctuations, or the movement of the mold clamping will fluctuate the display of the ejected electronic ruler, resulting in a great error in the measurement result. If the drive power of the solenoid valve is at the same time when the power supply of the linear displacement sensor is at the same time, the above situation is more likely to occur. When the situation is serious, the voltage of the multimeter can even measure the fluctuation of t
  • 2020-12-13
    Application of sensor in electronic control of automobile chassis
    Abstract : Entering a new era, the development of electronic technology has become the main factor affecting the development direction of automobiles. Sensors are the core components of electronic technology and have been widely used by modern automobiles. One of its functions is to improve the brake handling performance of the chassis, the stability of the steering performance and the safety of the car. This paper deeply studies the application status of sensors in the electronic control of automobile chassis, and gives a detailed introduction to its future development trend. This article refers to the address: http:// 1 Introduction With the development of electronic technology, the degree of electronicization of automobiles is also increasing. The connection between the device and the actuator of the chassis control system also enters the electrical signal connection phase by a simple mechanical connection phase. A good chassis electronic control system improves the adhesion between the wheel and the ground, thereby improving the safety, power and comfort of the car [1]. The application of electronic control systems in automotive chassis technology has improved the active safety of automobiles. Common chassis control systems are as follows: traction control, brake control, suspension control and steering control [2]. The sensor is the core device in the electronic technology. It is a device for signal t
  • 2020-12-12
    Temperature sensor insertion depth control
    The normal operation of the temperature sensor element is to meet its operating conditions, one of which is its operating current, because the temperature sensor has a resistance value, when the current flows through the temperature sensor element, there will be power loss, it will heat, so in order to To reduce the temperature error caused by the sensor's own heating, so to meet the normal working conditions of the sensor, to minimize its own heat. This is why the temperature sensor is used under constant, low current conditions. So, for example, the platinum thermal resistance's normal operating current is 5mA, but our recommended operating current is 1MA. The reason is to reduce the measurement error due to self-heating of the temperature sensor element. The current is constant and its output has a linear relationship between temperature and potential. The insertion depth of the temperature sensor is also a problem that is easy to overlook. Some customers require a very short insertion depth but a relatively large diameter. This is unreasonable, especially in the case of high temperatures, which is not desirable. In theory, the temperature sensor is inserted. Depth can generally be determined according to actual needs. However, the minimum insertion depth should not be le
  • 2020-12-01
    Design of LED Landscape Lighting Control System Based on Wireless Sensor Network
    Abstract: Solar LED lighting system has been widely used as a green energy source in recent years. It introduces a solar energy landscape lighting control system based on sensor network, which is simple, reliable and easy to deploy. Based on ZigBee wireless sensor network architecture, the light intensity of the lighting unit in the system is realized. Color control, using polling mechanism to solve the real-time acquisition of each lighting unit state and broadcast frame synchronization collaborative lighting unit to complete the scene conversion, all system information is processed centrally by the host computer control software through the GPRS network. Compared with traditional illumination sources, LED lamps have the advantages of low power consumption, long life, fast response, no radiation, high-frequency switch flashing, convenient dimming, etc., and are one of the important choices for landscape lighting. At present, solar LED landscape lighting systems are increasingly used in urban squares, main parks and other fields. The wireless sensor network square landscape lighting system introduced in this paper realizes the remote control of LED light switch, light intensity and color, and can flexibly construct multiple landscape scenes, and simultaneously detect the working status and power supply of LED lamps in real time to ensure timely and effective system maintenance. . 1 system struc
  • 2020-11-24
    Inverter without AC voltage sensor control strategy under voltage imbalance
    Researchers Hu Shuju, Meng Yanfeng, Li Fenglin, Song Bin, and Deng Ya from the Institute of Electrical Engineering, Chinese Academy of Sciences, in the 24th issue of Journal of Electrical Engineering, in the study of a non-ideal grid voltage condition, to study a voltage imbalance in the grid. The grid-connected inverter has no AC voltage sensor control strategy. Firstly, based on the second-order generalized integrator, the orthogonal filter and the three-phase grid-connected inverter voltage observer suitable for the grid voltage unbalance condition are constructed, and the grid voltage is observed in the two-phase stationary coordinate system; then based on the orthogonal filter The output is positively and negatively sequenced, so that the positive and negative sequence separations are synchronized with the grid voltage observation. Finally, the inverter is combined with the PR control in the two-phase stationary coordinate system, and the negative sequence compensation algorithm is used to realize the inverter. No AC voltage sensor control under grid voltage imbalance conditions. This strategy can avoid the problems of integral saturation, initial value sensitivity and static error in traditional virtual flux linkage observation, and overcome the problem that the existing orthogonal filter-based inverter without AC voltage sensor can not adapt to the grid voltage imbalance. . The effectiveness of the proposed strategy is verified by simulation and experiment. When a renewable energy power generation system is connected to a power distribution network such as an inverter or a distribution
  • 2020-11-13
    Application of Current Sensor Sampling in Servo Control System
    Introduction Servo technology is a tracking and positioning control technology and an important part of electromechanical integration technology. It is widely used in automation equipment such as CNC machine tools and industrial robots. With the continuous expansion of modern industrial production, the demand for electric servo systems in various industries is increasing day by day, and higher demands are placed on their performance. Therefore, researching and manufacturing high-performance, high-reliability servo drive systems is a goal that industrial advanced countries are striving to achieve. It has very important practical significance. At present, digital servo drives are basically monopolized by Japan, Europe and the United States. Every year, China needs to import a large amount of such equipment from abroad for CNC machine tools and other industries. The price of imported drives is high and maintenance services are inconvenient. The all-digital servo driver with independent intellectual property rights in China began to be manufactured in large scale in the 1990s. Huazhong CNC hsv series digital AC servo motor drive unit has good performance. The speed ratio of all-digital AC servo system independently developed by our company is 1:5000. High-end products often use foreign AC servo systems, mainly domestic servo drive controllers in high-speed and high-precision control characteristics, compared with Japan's fanuc, Mitsubishi, Panasonic, Fu
  • 2020-11-11
    Turck new linear displacement sensor available for hydraulic cylinders
    Recently, Turck introduced linear displacement sensors for hydraulic cylinders - the new magnetostrictive LTX series linear displacement sensors. The sensor can achieve liquid level detection through the use of float-type positioning magnetic blocks. Depending on the high seismic resistance and impact resistance of the sensor, this series of sensors can also be applied to construction machinery and other harsh working environments. This series of products completes the family of inductive linear displacement sensors, especially where magnetic positioning blocks must be used. The LTX-Series products meet the IP68 protection rating while it has anti-corrosive properties for many chemicals and oils. The high quality stainless steel housing protects the product from working in many corrosive environments. The LTX series linear displacement sensor uses a wear-free detection method, which ensures that it can provide a precise signal output with high linearity and repeatability. It can provide analog signal output (4-20 mA or 0-10 VDC signal) or SSI digital signal output with high precision. A three-color LED indicator can show the working status of the sensor. The low input power (1 watt) version can be connected directly to the display module, control module or interface module. The easy programming of LTX series sensors makes it easy to adjust the detection range. For setting a s
  • 2020-11-09
    Sensor control unit and sensor control system
    There is no limit to creativity, and the instrument is invented. Today we introduce a patent for national inventions - sensor control devices and sensor control systems. The patent was filed by Japan Special Ceramics Co., Ltd. and was authorized to be announced on April 12, 2017. Description The present invention relates to a sensor control device and a sensor control system, wherein the sensor control device and the sensor control system measure, for example, a concentration of a specific component in an object measurement gas such as an aerated mixture of an internal combustion engine, and are suitable for use in an oxygen sensor The output signal is compensated. Background of the invention In recent internal combustion engines, in order to improve fuel economy and reduce harmful substances contained in exhaust gas, control of an air-fuel ratio as a ratio of fuel to intake air is generally performed, particularly for fuel versus intake air. Control of the ratio of oxygen contained in the medium. When this control is performed, it is necessary to measure the volume of the intake air. For example, a method of using an air mass flow sensor for measuring the volume of intake air is known. The air mass flow sensor is used in an internal combustion engine equipped with an intake throttle valve and can be used to measure an in-cylinder intake air volume that changes according to an operating state. On the other hand, an intake
  • 2020-10-23
    Flexible fingerprint sensor is expected to realize embedded security access control
    According to the James Consulting, researchers from the Belgian Microelectronics Research Center (IMEC) and the Dutch Applied Science Organization (TNO), the Holst Center researchers showed a test for detecting fingers. New flexible, large area sensor technology for palm prints. With a thickness of less than 0.2 mm and no large prisms or moving parts, the new sensor can be embedded in objects such as mobile phones and door handles to create an "invisible" but secure access control system that recognizes that the scanned object is alive rather than a phantom. Or a fake person. The technology paves the way for low-cost sensors for large-area finger and palmprint scanners, which will be on display at the Information Display Association (SID) 2018 Display Week Innovation Zone in Los Angeles, USA, and will be in Belgium. The IMEC Technology Forum (ITF) in Antwerp is on display. The two demonstration machines will demonstrate the technological potential for high resolution and large area effective detection areas. Among them, the 6 x 8 cm, 200-ppi demonstration machine is large enough for the 4-finger scanners currently used by border management and provides adequate image quality for basic identification applications. At the same time, the slightly smaller 500 ppi demonstration machine provides higher image quality, meets FBI standards, and is sufficient for law enforcement agencies to visualize details and pores for more powerful identification. Like the Holst Center's early flexible X-ray detectors, this fingerprint sensor combines an organic photodiode front panel, an oxide thin film transistor (TFT) backplane (originally developed for flexible displays) and a thin film barrier for protection. Together. All three technical elements have been or are being transferred to industrial production to expand and commercialize. The sensor reads hand fingerprints or palm p
  • 2020-10-19
    Linear displacement sensor working principle and fault handling method - Database & Sql Blog Articles
    The linear displacement sensor works on the same principle as a sliding rheostat. It is used as a voltage divider to present the actual position of the measured position with a relative output voltage. There are several requirements for the operation of this device: First, if the electronic ruler has been used for a long time, and the seal has been aging, and there are many impurities, and the water mixture and oil will seriously affect the contact resistance of the brush, so that the displayed number will continue to jump. At this time, it can be said that the electronic scale of the linear displacement sensor has been damaged and needs to be replaced. Second, if the capacity of the power supply is small, there will be many situations, so the power supply needs to have sufficient capacity. Then, if the capacity is insufficient, it will cause the following situation: the movement of the glue will change the display of the clamped electronic ruler, and there will be fluctuations, or the movement of the mold will cause the display of the electronic ruler to fluctuate, resulting in a large error in the measurement result. If the driving power of the solenoid valve is at the same time when the power supply of the electronic scale is together, the above situation is more likely to occur. When the situation is serious, the voltage fluctuation of the multimeter can
  • 2020-10-12
    Design of Sensing System Based on Light Intensity Sensor TSL256x--Photosensitive Sensor and Control Technology
    1 Introduction to TSL256x TSL2560 and TSL2561 are a high-speed, low-power, wide-range, programmable and flexible configuration of light intensity digital conversion chips introduced by TAOS. The chip can be widely used in the monitoring of various display screens, the purpose is to make the display screen provide the best display brightness and reduce the power consumption as much as possible under changing lighting conditions; it can also be used for street lighting control and safety lighting And many other occasions. The main features of this chip are as follows: Programmable upper and lower thresholds for permitted light intensity, and an interrupt signal is given when the actual light intensity exceeds this threshold; Digital output conforms to standard SMBus (TSL2560) and I2C (TSL2561) bus protocols; Programmable control of analog gain and digital output time; 1.25 mm & TImes; 1.75 mm ultra-small package, in low power mode, power consumption is only 0.75 mW; Automatically suppress 50 Hz / 60 Hz light fluctuations. 2 TSL256x pin function TSL256x has 2 kinds of packaging forms: 6LEAD CHIPSCALE and 6LEAD TMB. Different packaging forms have different formulas for calculating the corresponding illuminance. The functions of each pin are as follows: Pin 1 and pin 3: Power pin and signal ground respectively. Its operatin
  • 2020-10-10
    Application of Leaf Humidity Sensor in Plant Greenhouse Control System
    The growth of precious flowers, nursery stocks, and back-season vegetables requires natural environmental conditions for growth, including temperature, humidity, light, and carbon dioxide levels. When climatic conditions do not meet the above requirements, they grow poorly, withering, rot or die. If the greenhouse is intelligently controlled so that its climate parameters are always in the optimal state for plant growth, it will greatly increase its output and grade, and bring about better economic benefits. At present, there are few intelligent control applications for agricultural greenhouses in China, mainly because such equipment is expensive and not suitable for national conditions. To this end, we have developed a low-cost plant greenhouse automatic control system that can provide the optimum temperature, humidity, light intensity and carbon dioxide content and other climatic conditions for plant growth, and is most suitable for the existing medium and low grades in China. The "intelligent" transformation of greenhouses is in line with the level of farmers' consumption and is suitable for China's national conditions. Foliar humidity sensors are an important part of the moisture analysis of crop foliage. The function of the sensor subsystem is to convert climate parameters into voltage parameters. It is the main source of information for the monitoring system and relates to the reliability and accuracy of the entire system for detection, data a
  • 2020-10-10
    Design of LED Street Light Energy Saving Control System Based on Wireless Sensor Technology
    0 Preface China's urban lighting has been rapidly developed along with the acceleration of China's urbanization process. However, the energy demand and consumption in the development of urban lighting is also increasing. In general, green lighting work still has problems such as high energy consumption, high pollution, and low efficiency. According to the survey, China's current street lamps are mainly low-efficiency lighting, and the energy utilization rate is low. In view of the serious pollution, power waste, high energy density and low lighting efficiency in the lighting, researching the street lamp energy-saving control system and promoting street lighting energy-saving and energy-saving will play an active role in promoting the overall development of green lighting. 1 The current shortage of street lighting systems In modern society, the street lighting of urban charm business cards and windows has created a splendid urban civilization and brought some problems. Energy consumption has become the key to restricting the development of current street lighting systems. 1.1 Large voltage fluctuations - waste of operation Since the change in the grid load varies with the time period, the corresponding voltage fluctuation is also large. In the middle of the n
  • 2020-10-08
    Automatic control of fire tuyere pressure using positive pressure air supply pressure sensor
    Positive pressure air supply In order to ensure the positive pressure value of the smoke-proof stairwell and its front room, the fire elevator room front room and the combined front room, to prevent the positive pressure value from being too large, the evacuation door is difficult to push open, and should be in the smoke-proof stairwell. A front pressure chamber is provided between the front chamber and the front chamber to control the positive pressure air supply pressure. The pressure difference between the positive pressures on both sides does not exceed 50Pa. In order to promote the flow of pressurized air in the anti-smoke stairwell to the walkway and play a role in blocking the flue gas of the fire layer, it is required that the air pressure of the anti-smoke stairwell is greater than the air pressure of the front chamber during the pressurized air supply, and the front The air pressure in the chamber is greater than the air pressure in the aisle. According to the relevant research results, the positive pressure values of the anti-smoke stairwell and the front room, the combined front room, the fire elevator front room and the refuge floor are specified. A range is specified for the positive pressure value in order to comply with the actual situation of the engineering design, and it is easier to grasp and detect. For spaces such as stairwells and front rooms, if the direction of the pressurized air supply force is opposite to the opening direction of the evacuation door, if the positive pressure air supply pressure If the pressure is too high, it will cause difficulty in opening the evacuation door and affect the safety evacuation
  • 2020-10-07
    Analysis of the application of physical sensor in intelligent home control system
    A physical sensor is a sensor that detects physical quantities. It is a device that uses certain physical effects to convert the measured physical quantity into a signal in the form of energy that is easy to process. The signal it outputs has a definite relationship with the input signal. The main physical sensors are photoelectric sensors, piezoelectric sensors, piezoresistive sensors, electromagnetic sensors, thermoelectric sensors, and optical fiber sensors. As an example, let's take a look at the more commonly used photoelectric sensors. Such a sensor converts an optical signal into an electrical signal, which directly detects radiation information from an object, and can also convert other physical quantities into an optical signal. The main principle is the photoelectric effect: when light is irradiated onto a substance, the electrical effect on the substance changes, and the electrical effects here include electron emission, conductivity, and potential current. Obviously, devices that can easily produce such effects become the main components of photoelectric sensors, such as photoresistors. In this way, we know that the main working process of the photoelectric sensor is to receive the corresponding light, convert the light energy into electrical energy through a device like a photoresistor, and then obtain the desired output through the amplification and denoising processing. electric signal. The output electrical signal here has a c
  • 2020-09-18
    Application of sensor in intelligent control of LED lamps
    The biggest difference between LED lighting and traditional lighting, LED lighting is a complete electronic product, and traditional lighting is only an electrical product. Therefore, LED lamps can be easily associated with various types of sensors, thereby achieving various automatic control functions such as light control and infrared control. For example, the automatic switch of LED street light can be easily realized by a photosensitive sensor; community night walkway and courtyard lighting can use infrared sensors to collect human activity information and automatically open and close lighting fixtures. LED lighting switch automatic control As a device for signal acquisition and electromechanical conversion, the electromechanical technology of the sensor is q
  • 2020-09-17
    The role of current sensor in inverter control
    Small power supplies have been incorporating more and more new technologies. Such as switching power supply, hard switching, soft switching, parameter regulation, linear feedback regulator, magnetic amplifier technology, digital voltage regulator, PWM, SPWM, electromagnetic compatibility and so on. The actual demand directly promotes the continuous development and advancement of power supply technology, in order to automatically detect and display current, and has automatic protection function and more advanced intelligent control when the overcurrent, overvoltage and other hazards occur, with sensing detection, sensing sampling, Sensing-protected power supply technology is becoming a trend, and sensors for detecting current or voltage have emerged and are beginning to be favored by power supply designers in China. The current sensor is used as a key component in the inverter control to ensure the performance of the inverter. At present, some of the inverter failures on the market are caused by damage or poor use of the current sensor. The following describes the current sensor in the frequency converter, generally supporting the current sensor, there is a corresponding power supply ± 12V, ± 15V; conditioning circuit constitutes a current sampling module, the module converts the three-phase stator current into a basic binary code, Provide timely information on the current to complete the adjustment of the cur
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