120 results about "Voltage alarm" patented technology

The present invention provides a passive RFID chip with on-chip charge pumps for generating electrical power for the chip from radio frequencies. The passive RFID chip comprises an analog portion and a digital portion. The analog portion primarily comprises a voltage sensor and an AM data detector. The digital portion comprises a state machine digital logic controller. Incoming RF signals enter the chip via external antennas. The RF signals are converted into regulated DC signals by RF-DC converters with the voltage sensor. The RF-DC converters provide power for all the on-chip components and hence the chip does not require external power supply. The incoming RF signals are demodulated by demodulators and enter the AM data detector where the envelope transitions are detected. A voltage alarm is provided to ensure the voltage level does not drop below an operational level of the chip. The logic signals and programming data are controlled by the state machine digital logic controller and the timing signals are provided by an on-chip oscillator.

A leak detector pad comprising a circuit board having a bottom surface and a top surface, spaced first and second electrically conductive traces located on the bottom surface, and an electronic circuit mounted on the top surface. The circuit includes a first segment adapted to create an alternating current (AC) voltage waveform, a second segment adapted to apply the AC voltage waveform between the traces on the bottom surface of the circuit board, a third segment adapted to create a measure of a capacitance between the traces based upon an AC current flowing between the traces as a result of the AC voltage waveform, and a fourth segment adapted to create a direct current (DC) voltage alarm signal if the measure of capacitance provided by the third segment indicates the presence of fluid.

A leak detector pad comprising a circuit board having a bottom surface and a top surface, spaced first and second electrically conductive traces located on the bottom surface, and an electronic circuit mounted on the top surface. The circuit includes a first segment adapted to create an alternating current (AC) voltage waveform, a second segment adapted to apply the AC voltage waveform between the traces on the bottom surface of the circuit board, a third segment adapted to create a measure of a capacitance between the traces based upon an AC current flowing between the traces as a result of the AC voltage waveform, and a fourth segment adapted to create a direct current (DC) voltage alarm signal if the measure of capacitance provided by the third segment indicates the presence of fluid.

The invention discloses a voltage balance circuit of a super-capacitor module. The voltage balance circuit of the super-capacitor module comprises a voltage monitoring circuit, an over-voltage discharging circuit and an over-voltage alarm circuit, wherein the voltage monitoring circuit is connected with a single super-capacitor, and monitors the voltage of the single super-capacitor in real time; when the voltage of the single super-capacitor exceeds a preset value, the voltage monitoring circuit triggers the over-voltage discharging circuit which is connected with the voltage monitoring circuit to discharge the single super-capacitor, and triggers the over-voltage alarm circuit which is connected with the voltage monitoring circuit to give an alarm; and when the over-voltage discharging circuit discharges the voltage of the single super-capacitor until the voltage is within the preset value, the voltage monitoring circuit triggers the over-voltage discharging circuit to stop discharging the single super-capacitor. According to the voltage balance circuit of the super-capacitor module, when the super-capacitor module is discharged, the charging voltage of each single super-capacitor cannot exceed the preset value, and the safety and the reliability of the application of the super-capacitor module are further ensured.

This invention relates to a method of advancing photometric quantity measuring apparatus accuracy of measurement. Method include; measured light through V ( lambda) regulation then be received by detector to turn to current signal, passing iv transducer turn ro voltage alarm, after magnifying then passing A / D transducer turn to digital signal; processing the digital signal, and send the results to PC machine or scope for presentation;this instrument beforehand has passed difference spectral range standard light source adjust, gain different instrument calibration coefficient; And use homologize wave band's instrument calibration coefficient while use this instrument to measure difference wave band light source. The described standard light source is linear light source that has scaling measured by instrument of higher order of accuracy. The described difference spectral range divided into red green blue yellow white five colors.

The invention relates to equipment for automobile safety, and discloses a wireless charging monitoring device for automobile tire pressure. The monitoring device comprises automobile tire pressure sensors including a temperature sensor, a pressure sensor and an acceleration sensor, a voltage monitoring circuit, an A / D (Analog / Digital) conversion circuit and a microcontroller. The monitoring device is characterized in that a user can wirelessly charge the automobile tire pressure sensors by a wireless charger, the wireless charging part executes energy coupling through an inductance coil so as to realize energy transfer, and an electromagnetic induction circuit part also executes energy coupling and inputs energy. The monitoring device has the advantages that, in the case of under-voltage, the system executes under-voltage alarm, at this time, the user can wirelessly charge the tire pressure sensors through the wireless charger, so that long-term power supply is kept, although the device provided by the invention has very small volume and very low battery capacity, long-term work of the tire pressure monitoring system can be maintained, accidents of tire burst can be reduced, and serious traffic accidents can be reduced; and the monitoring device is efficient, and has remarkable technical progress.

The invention discloses an automatic fault detection method for a gas water heater. The automatic fault detection method is characterized by comprising the steps of (1) initializing combustion controlparameters of the gas water heater; (2) determining whether the gas water heater meets the combustion working conditions or not; (3) determining whether the water flow is stable or not; (4) determining whether a low-voltage fault and / or a howling fault is detected for the first time or not; (5) adjusting the control parameters of the gas water heater according to the fault type; (6) storing the control parameters; and (7) entering the normal combustion working mode. The automatic fault detection method has the advantages that the control parameters of the gas water heater are adjusted and memorized, when the low-voltage condition and / or the howling condition occurs again in the next combustion process, the rotating speed of a fan and the current of a proportional valve can be directly andautomatically adjusted to a normal combustion state so as to avoid a low-voltage alarm and / or a howling alarm.

There is provided a battery voltage alarm apparatus which announces the necessity of battery exchange when battery voltage falls below a predetermined level. The battery voltage alarm apparatus has a battery voltage detector, and a plurality of steps of detection levels for raising battery low voltage alarm are set and alarm sounds generated at individual levels are made to be different from each other. An alarm raised at a higher level is made to be an intermittent singing or a low-volume singing in order to reduce power consumption.

The invention discloses a remote-control step voltage alarm trolley and an alarm method thereof. The remote-control step voltage alarm trolley comprises a remote controller and a controller, and is characterized in that the controller is located on a remote control trolley body and wirelessly connected with the remote controller, the remote control trolley body is of a structure with the front-and-back length being adjustable, a front chassis is provided with an inserting slot inwards, a rear chassis is provided with an inserting rod inwards, the inserting rod is slidably inserted in the inserting slot, the inserting slot is provided with a fastener between the inserting slot and the inserting rod, the front of the front chassis is provided with an independent driving motor, either a front wheel or a rear wheel is of a metal wheel structure, the metal wheel is connected with a slip ring through a hub, the metal wheel, the hub and the slip ring are electrically connected, the slip ring is connected with an axle in an insulated manner through an insulating ring, and the slip rings are respectively connected to the input end of a step voltage alarm arranged on the remote control trolley body through elastic pieces which are slidably connected with the slip rings and fixed on the remote control trolley body. According to the invention, long-distance remote control can be realized for the trolley, detection is carried out on the periphery of broken-down equipment from far and near, and an alarm is given out when the step voltage exceeds set voltage, thereby greatly reducing occurrence of personal electric shock casualty accidents.

The invention discloses a step voltage alarm system. The alarm system comprises a ground voltage monitoring system, wherein the ground voltage monitoring system comprises electrodes which are arranged on the ground in an inserting manner, a voltage comparing system is arranged between every two adjacent electrodes, the voltage comparing systems are connected with a micro processor system, the micro processor system is connected with a wireless communication module, and the ground voltage monitoring system is connected with a monitoring host through the wireless communication module. By arranging the electrodes on the ground in the inserting manner, the step voltage condition can be obtained through the voltage comparing systems among the electrodes, and whether the step voltage obtained by the voltage comparing systems is greater than the specified value or not can be judged through the micro processor system. When the step voltage is greater than the specified value, the remote wireless alarm is realized by the wireless communication module connected with the monitoring host in a wireless communication manner.

The invention relates to a method for recovering equipment state after low voltage rise, a main control signal board and a system. The method comprises the following steps: when a main control single board receives an under-voltage alarm signal reported by a power supply single board, detecting the operating state of a service single board; when abnormal operation of the service single board is detected and the under-voltage alarm signal reported by the power supply single board is received, sending a reset instruction to the service single board, so that the service single board returns to the normal state. On the basis that communication equipment has the characteristics of external enabling reset, with the low-voltage detecting result of the power supply single board, when the machine room power supply is abnormal, the power supply single board reports the under-voltage alarm signal, the main control single board detects the operating state of the service single board; when the service single board operates abnormally, and the power supply single board reports the under-voltage alarm disappearance signal, the main control single board sends the reset instruction to the service single board, so that the service single board in the abnormal state returns to the normal state, thereby protecting the normal operation of the equipment-carried service to the maximum extent and reducing the investment cost of a user.

The invention relates to step voltage alarm shoes. Each shoe comprises a sole and an upper, wherein the sole is insulated and is provided with a step voltage alarm device. The step voltage alarm shoes applied to the personnel of a power system as well as the common electricians can remind users whether the ground is electrified and whether the step voltage is dangerous. The step voltage alarm shoes can not only protect the safety of the users, but also facilitate the timely discovery of a grounding phenomenon of the system so as to take timely measures to avoid threats to the system security.

The invention discloses an automatic parallel off and parallel control device for sectionalized power supply of a single busbar and an automatic parallel off and parallel control device based automatic parallel off and parallel control method for sectionalized power supply of the single busbar, and the method and the device are applied to the field of transmission line detection and control. The automatic control device comprises a voltage detection unit, a switch state monitoring unit, a single chip microcomputer control unit, a drive unit, a direct-current power supply unit and a network voltage alarm unit. The device and the method are capable of monitoring voltage amplitude and switch state of sectionalized lines of the single busbar in real time and achieving automatic control of parallel off and parallel operation of the sectionalized lines of the single busbar according to monitoring information.

The invention provides a voltage alarm method used for buses of a main electric network. The voltage alarm method includes the following steps: (1) judging the incidence relation between the buses and the voltage stage, and taking the bus, with the minimum difference value between the voltage value and the rated value, in the multiple buses belonging to the same voltage stage for conducting out-of-limit judgment; (2) conducting filtering processing on the voltage value of a pilot node to obtain a relatively-smooth voltage curve, analyzing the voltage variation trend according to the curve, calculating the time for reaching an out-of-limit value according to the voltage variation trend, and giving out an alarm if the time is smaller than a setting value; (3) reading historical data of the bus operation voltage in the previous day, evaluating voltage out-of-limit risks this day, giving out an alarm if the risks are found, classifying the alarms, and notifying a dispatching and operating person to make a processing scheme in advance. According to the voltage alarm method, analysis objects are improved into the voltage stage, misinformation caused by bus overhauling is avoided, and the bus voltage real-time out-of-limit monitoring function of a conventional processing method is retained.

The invented relay integrated with measuring, protection, communication, controlling and monitoring functions includes sampling circuit, microprocessor, relaying protection circuit, display drive circuit, RS-485 bus communication interface, power down protection circuit and key set circuit. The invention possessing powerful synthetical measuring and displaying functions can show electrical parameters such as three phase currents and voltages, total power factor, total reactive power and active power and frequency as well as indicate on / off or fault status of breaker. Operating faceplate can setup CT ratio, display first current and voltage of incoming line. Setting each protection parameters can realize short circuit fast breaking, over voltage and lower voltage alarm. The invented device can also replace traditional current meter, voltage meter, frequency meter, power factor meter and reactive / active meter etc.

Said invention provides an electric arc fault protection circuit. It contains electric arc signal detection circuit connected to three-phase alternating-current supply, used for sensing out normal voltage and arc composite voltage alarm, filtering off frequency lower than 60 Hz; rectifying filter circuit connected with three-phase alternating-current supply and electric arc signal detection circuit; signal comparing circuit connected with said rectifying filter circuit; on / off control circuit connected with said signal comparing circuit used for receiving said signal comparing circuit output triggering level and disconnecting fault circuit for eliminating fire hazard and reducing loss.

The invention is to provide an unrecoverable cable linear temperature sensing fire probe which realizes recoverable temperature sensing multilevel alarm. Both ends of the temperature sensing cable are respectively connected to a microcomputer modulator and a terminal resistor to form a closed circuit signal collecting circuit, characterized in that the structure of the temperature sensing cable is: two elastic metal conductors adopted respectively coat CTR special material layer with different Vicat softening point, two cores with different coat layers intertwisted in back-twist intertwist way. The intertwisted node distance is preferably between 20mm to 200mm to prepare the temperature sensing cable. The microcomputer modulator monitors the resistance value or voltage alternation between two elastic metal conductors, arranging two resistance values or voltage alarming signal starting values in a memory of the microcomputer modulator to realize double level constant temperature alarming signal output and realizes a malfunction alarming signal output according to the short circuit, the open circuit between the two elastic metal conductors and power cut of the microcomputer modulator.

The present invention relates to photodetector made of doping oxide and silicon heterojunction material, with ultra-fast responding, broadband, high sensitivity and anti-radiation. It contains casing, optical sensor, first electrode, second electrode, two electrode leading wires, insulating piece, first metal block, second metal block and metal bolt; wherein said optical sensor consisting of one or more of series connected doping oxide and silicon heterojunction material decetor chip and installed in one metal enclosure, leading out output port by coaxial cable coaxial cable joint, said decetor being photoproduction volt type photoelectric detector, directly generating voltage alarm by light radiating without any auxiliary accessory power supply and electronic circuit. Its responding wave band is from ultraviolet to far infrared, capable of responding femtosecond pulse width laser pulse, response speed reaching ps, capable of detecting pulsed laser waveform with hundred of ps pulsewidth. Said invention has very high sensitivity and strong radioresistance ability.

The invention discloses a management device for an automated guided vehicle (AGV) lead-acid storage battery. The management device comprises a stabilized voltage supply circuit, a data collecting circuit, an information processing center, a data storage circuit and a signal control circuit. Voltage of the storage battery is collected in real time by the data collecting circuit and sent to the information processing center. When the voltage is smaller than a voltage lockout value, the signal control circuit is controlled by the information processing center to cut off a power consumption circuit of the storage battery; and when the voltage is lower than a high-voltage alarm value, the signal control circuit is controlled by the information processing center to give an over-voltage alarm. When the service time of the storage battery reaches a preset maintenance time threshold value, and / or the voltage of the storage battery is lower than the presupposed maintenance voltage threshold value, the signal control circuit is further controlled by the information processing center to conduct maintenance prompting. According to the management device for the AGV lead-acid storage battery, the storage battery is protected against the phenomenon of overcharge or overdischarge, a user is reminded in time to maintain the storage battery, and the service life of the storage battery is prolonged.

The invention discloses a fast sprint controller of a four-wheel micro-mouse based on double processors. The fast sprint controller comprises a power source device, a voltage detecting module, a low-voltage alarm device, a maze optimal information calling module, six sensors, a servo adjusting control unit, a controller body and motors. The controller body comprises a first driving unit, a second driving unit, a third driving unit and a fourth driving unit. The motors comprise a first motor, a second motor, a third motor and a fourth motor. The voltage detecting module is electrically connected with the power source device and the low-voltage alarm device. The power source device is electrically connected with the maze optimal information calling module, the sensors, the servo adjusting control unit, the controller body and the motors. The maze optimal information calling module is electrically connected with the servo adjusting control unit through the sensors. By means of the method, the fast sprint controller of the four-wheel micro-mouse can be provided, and the micro-mouse can fast return to sprint in a match through the processors of a double-buffering structure.

The invention provides a wearable step voltage alarming device, belonging to the technical field of electric power safety protection, aiming at solving the problems that step voltage injury accidents are caused by the fact that failure equipment or line fault grounded points cannot be predicated in advance when and power transformation, power distribution operation and maintenance staff inspect failed high-voltage equipment or lines with power. The device is worn on double feet of the operation and maintenance staff and voltage of a current footstep is sensed through a voltage sensor; the obtained voltage is sent to a computer and a step voltage value is calculated; when the step voltage value exceeds a threshold value, a controller sends out an early warning signal to an alarm; and the alarm sends out sound and optical alarms to remind the operation and maintenance staff in inspection of being careful. By adopting the wearable step voltage alarming device, the operation and maintenance staff in the inspection can find out the failure equipment or the line fault grounded points in time and can also avoid the step voltage injury accidents, so that the personal safety of the operation and maintenance staff is guaranteed. The wearable step voltage alarming device can be used for electric power departments including State Grid and the like.

The invention discloses a parameter detection and alarm method and system for an explosion-proof automobile. The method comprises the following steps that voltage values, current values and temperature values of a power supply, a motor and a motor controller of the automobile are obtained and uploaded to a whole automobile controller through a CAN network; the vehicle control unit compares the voltage value with a plurality of preset voltage thresholds to obtain a voltage alarm level; the current value is compared with a plurality of preset current thresholds to obtain a current alarm level; the temperature value is compared with a plurality of preset temperature thresholds to obtain a temperature alarm level; and the vehicle control unit controls the instrument to display the alarm levelin real time and send out a corresponding alarm prompt. According to the invention, the vehicle control unit makes corresponding display and alarm prompts according to the voltage alarm level, the temperature alarm level and the temperature alarm level, so that a driver can make corresponding maintenance measures according to the alarm levels, and the safety of the explosion-proof vehicle during operation is improved.

The invention relates to a wireless door magnetic device with low power consumption. The wireless door magnetic device with the low power consumption comprises a power supply, a main controller, a magnetic reed pipe and a radio frequency emission circuit, wherein the power supply is respectively connected with the main controller and the magnetic reed pipe, the magnetic reed pipe is connected with a signal input end of the main controller, and a signal output end of the main controller is connected with the radio frequency emission circuit. The invention further relates to a method for controlling a wireless door magnetic alarm at low power consumption by employing the device. The method comprises the steps of main control operation processing and interruption control operation processing, wherein in the main control operation processing, the main controller judges whether an alarm signal is received from the magnetic reed pipe, whether an under voltage alarm condition is satisfied and whether a timing heartbeat maintenance condition is achieved; after entering the interruption program operation, the main controller transmits under voltage information, heartbeat information or alarm information by the radio frequency emission circuit so as to achieve wireless interaction with a 3G wireless fixed telephone, thus the wireless door magnetic detection with the low power consumption and the method for controlling the wireless magnetic door alarm can be conveniently applied to an intelligent safety prevention early warning system based on a 3G network.

The invention provides a method and device for data storage. The method and device are applied to the situation that a power failure happens when measurement is conducted through a flow meter. The method includes the steps of firstly, obtaining the voltage value of a power supply; secondly, monitoring whether the voltage value is lower than a preset voltage alarm value or not in real time; thirdly, when the voltage value is lower than the preset voltage alarm value, decreasing the working frequency of a controller in the flow meter, sequentially switching off switches of a converter and a field programmable gate array, and stopping supplying power to the converter and the field programmable gate array; fourthly, sending measurement data to a memorizer to be stored. Whether a power failure happens to an external power supply of the flow meter or not is monitored in real time, when a power failure happens to the flow meter, the working frequency of the controller in the flow meter is decreased, the converter and the field programmable gate array are powered off, and therefore it is ensured that when the controller has insufficient electricity, measurement data are completely written into the memorizer, and the data storage capacity of the flow meter is improved.

The present invention provides a LED backlight driving circuit, a backlight module, and a liquid crystal display device, wherein, the LED backlight driving circuit comprises: a power module, a voltage converting module, a constant current driving IC module, and a boost module. The output terminal of the power module is connected with the power source of the constant current driving IC module through the voltage converting module; the output terminal of the power module is connected with the positive electrode of the LED strings through the boost module. The boost module is provided with an over voltage alarm unit used to warn that the voltage of the positive electrode of the LED strings is high. In the present invention, it can warn immediately and notice the failures when the output voltage of the LED backlight driving circuit is too high or the failure happens.

The invention relates to a high-voltage switchgear with a voice alarm device, and relates to a high-voltage device in a transformer station in the field of electric power. The high-voltage switchgear comprises the voice alarm device and a circuit breaker installed outside a high-voltage distribution chamber. The circuit breaker comprises an operating mechanism, an auxiliary contact and a switch contact. The voice alarm device comprises a power source, a power switch, an infrared induction module, and a safety notification module, a high-voltage alarm module and a high-voltage detection module which are connected with the infrared induction module. The auxiliary contact of the circuit breaker is connected with the power switch of the voice alarm device. The high-voltage detection module is connected with the switch contact of the circuit breaker through a switch line. The high-voltage detection module is connected with a high-voltage alarm module and the safety notification module. The safety notification module and the high-voltage alarm module are respectively connected with a speaker. According to the invention, an operator can be prevented from walking to wrong intervals, whether equipment is live-line after the circuit breaker is broken can be detected, and in case of electricity, an alarm is given so as to prevent the operator from switching on a knife with a load.

A lamp drive under voltage alarm circuit is used for giving an alarm signal in the case of under voltage of lamp drive power supply voltage. The circuit comprises a voltage conversion module used for converting input voltage into rated voltage, a voltage comparison module, a switch module and an alarm module, wherein the input end of the voltage conversion module inputs power supply voltage; the output end of the voltage conversion module is electrically connected with the input end of the alarm module; the positive phase input end of the voltage comparison module inputs reference voltage, the negative phase input end of the voltage comparison module inputs power supply voltage, and the output end of the voltage comparison module is electrically connected with the control end of the switch module; the input end of the switch module is electrically connected with the output end of the alarm module, and the output end of the switch module is grounded. When the power supply voltage is lower than the reference voltage, the voltage comparison module outputs high level, the switch module receives the high level to be conducted, the alarm module forms a communication loop via the switch module, the alarm module gives an alarm signal to remind the user that the power supply voltage at the moment is in the under voltage state.

The invention discloses an intelligent radiation detection device and system based on internet. The intelligent radiation detection device and system comprise a mobile terminal, a radiation detectiondevice and a data analyzing platform. The radiation detection device comprises a microprocessor module and a radiation detection module, a position detection module, a battery level detection module,an alerting module, a wireless communication module, a storing module and a power supply battery module which are connected with the microprocessor module. The microprocessor module controls the modules to work, and judges whether alarm prompt information is generated based on the real-time radiation data and electric quantity information. The wireless communication module sends the data and information to the mobile terminal. A voltage alarm module issues alarm prompt based on the alarm prompt information. The radiation detection device and system has simple structure, is intelligent and convenient, and can achieve real-time tracking and intelligent managing of medical staff working environment conditions.

The invention provides a pneumatic-control charging-type electric quantity equalizing system for a power battery pack, which comprises a battery pack manager and a plurality of electric quantity equalizers. The system is characterized in that a plurality of pneumatic switches are added, the equalizing charge current of each electric quantity equalizer is more than 10 A, the output ends of the individual electric quantity equalizers are correspondingly connected in parallel at the two ends of the unit batteries in the battery pack, and the output end of the battery pack manager is correspondingly connected with the control ends of the electric quantity equalizers through the normally-closed contacts of the individual pneumatic switches. By use of the system, the equalizing speed and efficiency are increased, the unit batteries are fully charged, and the electric quantities of the unit batteries are relatively equalized, so that the charging efficiency is not reduced. The electric quantity of an over-discharged unit battery is supplemented in time during discharging, and an under-voltage alarm is given when the voltage of the whole battery pack drops to a preset value. The service life of the whole battery pack is dependent on low-life unit batteries in the battery pack, and since the unit batteries can be fully charged each time and not over-discharged, the service life of the battery pack is increased.