55results about How to "No false alarms" patented technology

The invention provides an insulated gate bipolar transistor (IGBT) over-current protection circuit which comprises a current sampling unit, a full-wave rectification unit, a peak value acquiring unit, a current comparing unit, a control unit and an IGBT drive unit. The current sampling unit is used for acquiring a three-phase output current. The full-wave rectification unit is used for respectively converting the three-phase output current to three single-direction currents. The peak value acquiring unit is used for acquiring the largest current in the three single-direction currents and outputting the largest current. The current comparing unit is used for respectively comparing the current output by the peak value acquiring unit with a quick current-limiting protection point and a limit protection point. The control unit is use for enabling the IGBT drive unit to block an IGBT or open the IGBT according to output of the current comparing unit. According to the IGBT over-current protection circuit, after the sampled three-phase output current is subjected to full-wave rectification, the peak value is used as the reference for over-current comparing, and the IGBT can be protected in a quick current-limiting mode and in a limit mode.

The invention provides a high-efficient low-complexity motion detection method applicable to image processing, which comprises the following steps: (1) converting the format of images, and zooming the images to obtain the image size in actual use; (2) dividing each image into an integral number of pixel sub blocks according to the image size in the actual use; (3) calculating the accumulated sum of each pixel sub block in the current frame of image, and calculating the ratio of the accumulated sums of the adjacent pixel sub blocks; (4) calculating the accumulated sum of each pixel sub block in a next frame of image, and calculating the ratio of the accumulated sums of the adjacent pixel sub blocks; (5) calculating the difference ratios of the ratio of the accumulated sums of the corresponding adjacent pixel sub blocks of the current frame and the next frame, and calculating the total number of the difference ratios greater than a set threshold value; (6) calculating the ratio of the total number of the difference ratios greater than a set threshold value to all the pixel sub blocks in the current frame and the next frame; and (7) judging whether the ratio is greater than a warningthreshold value according to the calculation result in step (6), and if so, indicating that motion is detected in the images.

The invention relates to the technical field of an elevator and discloses a detection and alarming device of abnormal opening of a hoistway door, comprising a power supply, a control unit, first switches, second switches, and alarms, wherein the first switches and the second switches are arranged on all floors and the alarms are arranged on all the floors; after the first switches and the second switches of all the floors are connected in parallel, n parallel circuits are formed; a serial circuit is formed by the n parallel circuits; the control unit comprises a potential detection circuit and a high potential output circuit; and when the potential detection circuit detects that when an nth input end is a low potential, a high-potential output circuit inputs a high potential to an nth parallel circuit and supplies power to the alarm of the nth floor to enable the alarm to give an alarm. The invention further discloses a realization method of the detection and alarming device, which can effectively detect all the abnormally-opened hoistway doors and sends out an effective alarming measure, so as to effectively detect and alarm the abnormal movement hoistway door when an elevator main control board has a floor identification error.

The invention discloses an alarm method for a power grid system. The alarm method comprises the steps: obtaining operation security type data, operation economic type data, operation quality type data and operation environment-protection type data in operation data of the power grid system; calculating security type monitoring indexes, economic type monitoring indexes, quality type monitoring indexes and environment-protection type monitoring indexes of the power grid system; and comparing all the monitoring indexes with corresponding preset thresholds respectively, and for the monitoring indexes which exceed the corresponding thresholds, giving out corresponding alarm signals. In addition, the invention discloses an alarm device for the power grid system. The alarm signals can comprise a pre-warning signal and an alert signal. An index system for monitoring the power grid system by using an alarm mode is established, so the power grid system can be monitored completely and systematically in the aspects of security, economic performance, quality and environment protection. The alarm paths are clear, and false alarm and alarm failure cannot occur.

The invention discloses an intelligent adjusting method of infrared anti-theft network, which compares the infrared impulse signal intensity received by the infrared receiver with the needed value to adjust and control the infrared impulse signal intensity sent by the infrared sender. It uses the infrared impulse signal intensity received by the infrared receiver to adjust the infrared impulse signal intensity sent by the infrared sender, so that it can achieve to the needed value.

The invention relates to an ultrasonic wave induction-type automobile anti-theft device, which comprises an automobile anti-theft host machine, at least one ultrasonic detector electrically connected with the automobile anti-theft host machine and at least one warning device electrically connected with the host machine. When a driver and passengers leave the automobile and start the device, then all the ultrasonic detectors respectively perform scanning to the reflected values of the ultrasonic waves in the positions corresponding to the ultrasonic detectors and preserve the reflected values in the host machine, if a person enters into the automobile or the glass of the automobile is broken, the change of the reflected values of the ultrasonic waves in the corresponding positions is caused respectively, the host machine responds to drive the warning device to send out warning after receiving the abnormal signal, and the warning device is provided with a high-decibel alarming horn and a GSM or CDMA mobile communication device which can be connected to the telephone of a vehicle owner. The invention also comprises a wireless remote controller used for controlling the starting and closing of the anti-theft function of the anti-theft device. By adopting the ultrasonic wave induction-type automobile anti-theft device with the structure, the false alarm phenomenon cannot occur, and the remote alarm can be realized.

The invention discloses a three-level active filter IGBT open-circuit fault positioning method and belongs to a frequency converter IGBT fault diagnosis method. According to the fault positioning method, level of a three-phase output point X of an active filter for a midpoint M of a DC bus is observed through two concrete methods, and positions of IGBTs specifically generating open-circuit faults are determined through similarity comparison. One method is that a level difference of the three-phase output point X for the midpoint M of the bus is solved in real time through a circuit theoretical loop equation, for representing an actual real level difference. The other method is that first of all, it is assumed that four X-phase IGBTs are respectively open-circuited, the level difference of the three-phase output point X for the midpoint M of the bus after the four X-phase IGBTs are open-circuited is obtained through current loop analysis reckoning, for representing a reckoned level difference. Since there is one, and only one waveform close to the level difference solved through the first method in the reckoned level difference, the faults can be determined. The method has the following advantages: 1, the method is independent from load types; 2, an accurate diagnosis can still be made under the condition of load abrupt change; 3, the accuracy is high; and 4, additional hardware cost is unnecessary.

The invention discloses an alarm system for a strain type tensile fence. The alarm system is characterized by comprising an upright post, a tensile line, a sensing pile, a strain sensor, a steel wireand a lock disk, the tensile line is transversely mounted on the upright post, and a knot is tied at the intersection between the tensile line and the vertically arranged steel wire; the lock disk isinstalled on the intersection of the steel wire and tensile wire, two ends of the steel wire are connected with the strain sensor, and the strain sensor is horizontally mounted on the sensing pile; the strain sensor is connected with a controller, and the controller is connected with a monitoring device. According to the alarm system, the steel wire and the tensile line are tied, when a person climbs the tensile line, the steel wire is pulled, and the steel wire can transfer the force to the strain sensor, thereby generating alarm.

The invention discloses a fault diagnosis optimization method based on fault propagation analysis, and relates to the technical field of fault diagnosis methods. The method comprises the following steps of obtaining an initial state fuzzy set of a diagnosed optimization system before testing; performing an optimization test on the initial state fuzzy set; judging whether the test is passed or not,inferring a possible diagnosis conclusion Xjp if the test is passed, and inferring a possible diagnosis conclusion Xjf if the test is not passed; judging whether the diagnosis conclusion Xjp and thediagnosis conclusion Xjf meet isolation requirements or not, outputting the diagnosis conclusion if the isolation requirements are met, judging whether a candidate fuzzy set exists or not if the isolation requirements are not met, and repeating the steps to test the candidate fuzzy set if the candidate fuzzy set exists; and outputting a diagnosis conclusion if the candidate fuzzy set does not exist. According to the method, the fault diagnosis method can be optimized, so that the time and the cost required by fault diagnosis are relatively lower.

The invention discloses a printed sheet overlay detection system for a full-automatic glazing machine. The system comprises a first support, a rotary shaft, a first rotary arm, a second rotary arm and a second support, wherein a shaft sleeve is arranged on the first support; the rotary shaft is arranged in the shaft sleeve; two or more than two rollers are arranged on the rotary shaft and fixedly connected with the rotary shaft through roller arms; one end of the first rotary arm is fixedly connected with one end of the rotary shaft, and the other end of the first rotary arm is provided with a fan-shaped rack; a gear is fixedly arranged on the second support; the gear is meshed with the fan-shaped rack; one end of the second rotary arm is fixedly connected with the gear, and a proximity switch is arranged at the other end; and a sensing plate is arranged at the lower part of the second support. The printed sheet overlay detection system for the full-automatic glazing machine is simple in structure, and can screen out overlaid printed sheets, so that local ink missing caused by printed sheet overlay is avoided, waste of the printed sheets in the production process is reduced, and efficiency of glazing of the printed sheets is improved.

The invention discloses a metal safety detection door. The metal safety detection door comprises two side door frames. The metal safety detection door is characterized in that a movable detection board is arranged on at least one of the side door frames; the movable detection board is provided with a movable driving mechanism, a probe array consisting of a plurality of telescopic metal probes is arranged on the movable detection board, and the probe array is electrically connected with a data acquisition system and an imaging system. The metal safety detection door has the advantages that the probe array consisting of a plurality of telescopic metal probes obtains accurate metal detection information and probe displacement information, so that the accurate positioning of human bodies carrying metal and the three-dimensional display of metal forms are realized, and wrong alarms are reduced.

Provided is a going out prompt method, comprising: establishing signal connection between a query device and a first device; employing the first device to detect an opening or closing state of a door, and to interruptedly send the opening or closing state to the query device according to a time sequence; querying the signal intensity between the query device and the first device; and recording a time point T when the signal intensity is less than a threshold value or signal intensity, and employing the query device to query an opening or closing state of the door at the time point T or in an M time period before the time point T, the obtained opening or closing state being regarded as a final opening or closing state.

The invention discloses an intrusion detection fence which comprises a hollow upright and fence net pieces and is characterized in that: a sensor node is arranged in the hollow upright and combined with the hollow upright and the fence net pieces. The intrusion detection fence can detect the intrusion behaviors of climbing and damaging (including shearing and gas cutting) the fence and adapt to severe environment, does not generate many false alarms, and is invisible and beautiful and easy to mount and maintain. In the production process of the fence, joints of embedded equipment are reserved, the leads are threaded in the production process, and the sensor node is mounted in a corresponding slot of the fence on the site only. When the sensor node fails, the sensor node is replaced.

The invention discloses a multi-open-circuit fault diagnosis method suitable for a multi-phase motor driver. Fault diagnosis variables are constructed on the basis of fundamental currents and harmoniccurrents in a reference coordinate system, and auxiliary calculation such as moving average is designed by analyzing fault characteristics of the constructed variables under various open-circuit faults, so that a fault index is defined. Aiming at the characteristic value expression of a fault index under an open-circuit fault, a threshold value judgment method combining characteristic value detection and a counting method is designed. And finally, a group of fault diagnosis marks is designed, and a multi-open-circuit fault diagnosis result of the multi-phase motor driver is obtained by checking the values of the diagnosis marks and combining a fault diagnosis table. According to the invention, the open-circuit fault of multiple switching tubes of the driver can be detected; the method hasstrong robustness, and does not generate a false alarm signal even under the condition of sudden load change or sudden rotating speed change; all calculations do not involve non-linear calculations,are compatible with a low-end digital processor with low processing capability, and have low requirements on the operational capability of the processor.

The invention discloses an overcurrent protection circuit with a self-checking function. The circuit comprises a current sensor, an MCU, a comparator and a CPLD, wherein the output end of the currentsensor is connected with the non-inverting input ends of the MCU and the comparator; the MCU is connected with the inverting input end of the comparator through a multi-order RC filtering circuit; theMCU sends out set PWM with a fixed duty ratio and inputs a reference voltage VREF to the comparator through the multi-order RC filtering circuit; and the output end of the comparator is connected with the CPLD. By using the scheme of the multi-order RC filtering circuit, the adjustability of a reference voltage VREF threshold is achieved, and the ripple wave size of the reference voltage VREF canbe better controlled; the magnitude of the reference voltage VREF can be adjusted in real time without change of a hardware circuit; the MCU can monitor the reference voltage VREF in real time, so that the safety of a system is guaranteed; and other voltage sources do not need to be introduced as the reference voltage VREF, so that the design cost and the power consumption of the system are reduced, the design scheme is optimized, and a fault is not misreported in a system initialization process according to the improved scheme.

The invention relates to an invisible protective bridge-cut-off heat-insulation window capable of achieving remote monitoring through networking. The invisible protective bridge-cut-off heat-insulation window comprises an invisible protective net window body and a heat-insulation glass window body. The invisible protective net window body comprises a first framework and a stainless steel cable installed on the first framework. The stainless steel cable is woven into a net shape on the first framework. A screen window is further arranged on the first framework between the stainless steel cable and the heat-insulation glass window body. The lower end of the screen window is placed into a lower clamping groove of the first framework through a spring piece, and the upper end of the screen window tightly abuts against the interior of an upper clamping groove of the first framework under the effect of the spring piece. An alerter is installed in the first framework. The invisible protective bridge-cut-off heat-insulation window capable of achieving remote monitoring through networking has the advantages that the invisible protective net window body and the heat-insulation glass window body are combined into a whole, the outline is aesthetic, the invisible property is high, and installation is easy and convenient.

The invention belongs to the field of desks and chairs for learning, and particularly relates to a learning desk with an intelligent photography posture correction function. The learning desk comprises a learning desk frame assembly and a desk plate arranged at the top of the learning desk frame assembly, wherein a bookshelf is arranged at the rear end of the desk plate; an intelligent photographyposture correction device is arranged on the bookshelf and comprises a device bottom housing case and a device housing matched with the device bottom housing case; an intelligent photography posturecorrection circuit board, a time relay and an infrared sensor module are arranged in the device bottom housing case; a video input unit, a sound player, an infrared living body probe and a power inputseat that are electrically connected with the intelligent photography posture correction device are arranged on the device housing. The children learning desk contributes to improving learning efficiency and learning quality of children and facilitates the children to develop a healthy learning habit.

The invention discloses a die monitoring system and method and a die template image generation system and method. The die monitoring system comprises a time interval storage module, a template storage module, a template acquisition module, a template reading module and a template difference comparison module. The time interval storage module is used for storing the acquisition interval data of each time period, the template storage module is used for storing the dynamic template video files formed by the template images at various time points, and the template acquisition module is used for acquiring the template images according to the acquisition interval data stored in the time interval storage module; the template reading module is used for reading the corresponding template images from the template storage module, each template image corresponds to a time point, and the template difference comparison module is used for comparing the template image acquired in real time with the template image at the corresponding time point in the template storage module to obtain a comparison result. According to the present invention, the detection accuracy can be improved, the false alarm is reduced, and meanwhile the detection efficiency is not affected.

The invention discloses a treatment device for cooling water circulation. The treatment device comprises a first water cooling circulation system and a stand-by second water cooling circulation system; the first water cooling circulation system comprises a gas-water separating unit, a main circulation pump, a three-way reversing valve, a heating filtering assembly, a plate-type heat exchanger, a heater and a main filter, wherein the main circulation pump communicates with the gas-water separating unit, and the three-way reversing valve, the heating filtering assembly, the plate-type heat exchanger, the heater and the main filter communicate with the main circulation pump; the three-way reversing valve, the heating filtering assembly and the plate-type heat exchanger communicate with one another, and circulating lines of a water cooling medium can be automatically switched by the heating filtering assembly; and the heater communicates with the heating filtering assembly, and the main filter communicates with the heater. The treatment device is small in size, not limited by space and provided with the stand-by cooling system, and the device does not need to stop during maintenance and can normally work; and gas in water can be separated, and the stable pressure of the whole system is guaranteed.

The invention relates to an anti-theft alarm method of vehicle, wherein it guards the vehicle according to the position of matter away to the vehicle and the ignition switch character; when guarding, it can cut off the circuit of engine and use the output line or circuit when the ignition switch is turned to ACC, ON and ST positions and the approach switch mounted under the engine cover as trigger signal source; when triggered, the anti-theft alarm will output one interval power source, to power the steering lamp, small lamp, or horn, to light or sound; and the alarm state will be held utile the power supply is consumed out; at that time, there is no sound and light, but the engine can not be started; after powered again, it will be back to the guard state. The invention can avoid noise pollution.

The invention relates to the technical field of vehicle safety, in particular to a vehicle parking safety control method and system. According to the method, a vehicle speed signal, a gear signal anda safety belt state signal are obtained, and when the vehicle speed is less than a set low value, the current gear is an N gear and a safety belt is unlocked, if the vehicle is not parked, an alarm signal is output. If the current gear is the N gear, it can be indicated that the vehicle is a started vehicle; if the vehicle speed is zero, it is indicated that the vehicle is started and stopped; andif the safety belt is unlocked, it is indicated that a driver has the tendency of parking for rest and getting off the vehicle; at the moment, the driver does not focus on driving; if the vehicle isnot successfully parked, the driver is prompted to pay attention, so that the safety of people and properties inside and outside the vehicle is effectively guaranteed; the judgment basis of the methodis accurate, false alarm is avoided, and interference to driving of a driver is reduced.

The invention discloses an overlapped printed sheet removing system of a full-automatic glazing machine. The system comprises a material collecting table, a rear paper conveying platform, paper conveying belts and an overlapped printed sheet detecting device and is characterized by further comprising an overlapped printed sheet removing device. The overlapped printed sheet removing device comprises a lifting mechanism, a paper rubbing wheel and a paper collecting table, wherein the paper rubbing wheel and the paper collecting table are fixedly arranged above the rear paper conveying platform, the lifting mechanism comprises at least a pair of lifting plates, a lifting beam and at least a lifting cylinder, the lifting cylinder is installed on the lower portions of the lifting plates, the lifting beam is fixedly connected to a piston of the lifting cylinder, the lifting plates are installed in the gap of the paper conveying belts, one end of each lifting plate is hinged to the rear paper conveying platform, the other end of each lifting plate is a free end, and the lower portions of the lifting plates are hinged to the lifting beam through connecting rods. The overlapped printed sheet removing system of the full-automatic glazing machine is simple in structure, overlapped printed sheets can be removed in time, the glazing efficiency of the printed sheets is improved and the yield of the printed sheets is increased.

The invention provides an optical fiber production Japanese wire drawing furnace with an automatic alarm function. The wire drawing furnace comprises a main body tower body supporting plate and a maincontrol cabinet, a traction disc device is installed on the upper portion of the main body tower body supporting plate, a pressing wheel device is installed on the side face of the traction disc device in an auxiliary mode, and the traction disc device is connected with the main control cabinet. According to the optical fiber production Japanese wire drawing furnace with an automatic alarm function, related operators can be reminded of accurate operation through an alarm system in the production process, then the phenomenon that a large number of optical fibers are scrapped in the productionprocess is prevented, and the heat dissipation effect of an automatic control device is remarkably improved.

The invention discloses a motor vehicle anti-theft alarm which can send an alarming signal when a thief attempts to steal and touches a motor vehicle. The motor vehicle anti-theft alarm is characterized in that the motor vehicle anti-theft alarm comprises a vehicle tracing positioning device and a relay controlling a battery to supply power to the motor vehicle, the vehicle tracing positioning device is internally provided with a sound-control circuit and sends the alarming signal to a mobile phone of a vehicle owner through a satellite according to the sound-control circuit, and the vehicle tracing positioning device is mounted in a sealed shell; and the interior of the sealing shell and air in the outside world are isolated, and at least one bead is further placed into the sealing shell.According to the motor vehicle anti-theft alarm, mistaken alarming can be prevented from being generated under the influence of sound from the outside world, and the accuracy of signal alarming is improved.