39 results about "Voltage alarm" patented technology

The invention relates to the field of vehicles, in particular to a tire pressure monitoring method, device and equipment, a vehicle and a readable storage medium. The method comprises the steps of obtaining first monitoring data recorded before a vehicle is started, wherein the first monitoring data comprises monitoring data of each tire of the vehicle; judging whether each tire is in a low-pressure state or not based on the first monitoring data; if any tire is in the low-pressure state, a low-pressure alarm instruction is generated, and the low-pressure alarm instruction is used for indicating the vehicle to output a low-pressure alarm signal. According to the invention, the timeliness of vehicle low-voltage alarm is improved.

The invention relates to the technical field of power supply management, and discloses a low-voltage detection circuit, and the circuit comprises a bias current unit which comprises a current mirror structure and is configured to mirror a reference current to generate a tail current; the delta Vth compensation low-voltage detection unit is respectively connected with the bias current unit, reference voltage and power supply voltage, and comprises a first PMOS (P-channel Metal Oxide Semiconductor) tube, a sixth NMOS (N-channel Metal Oxide Semiconductor) tube and a fifth NMOS tube which are sequentially connected in series, and a seventh NMOS tube which is bridged at the drain end and the source end of the sixth NMOS tube; wherein the source electrode of the first PMOS tube is connected with a power supply voltage, the source electrode of the fifth NMOS tube is connected with a tail current, and the grid electrodes of the first PMOS tube, the sixth NMOS tube and the fifth NMOS tube are all connected with a reference voltage; the grid electrode and the source electrode of the seventh NMOS tube are respectively connected with the drain electrode and the source electrode of the sixth NMOS tube, and the drain electrode of the seventh NMOS tube is connected with the power supply voltage; and the input end of the low-voltage alarm signal rectification phase inverter is connected with the grid electrode of the seventh NMOS tube, and the low-voltage alarm signal rectification phase inverter rectifies the detection voltage and outputs a low-voltage detection alarm signal. The circuit is small in area and low in static power consumption. The invention also discloses a chip.

This invention relates to a ground marking and cathodic protection integrated intelligent monitoring system for oil and gas pipelines, comprising a polarized test piece soil reference tube, a self-corroding test piece soil reference tube, a Mark signal sensor, a power supply, and a data acquisition recorder. The data acquisition recorder is equipped with a GPS positioning module and a communication module; the power supply has a low voltage warning function; the data acquisition recorder collects and processes cathodic protection parameters, stray current interference data, and pipeline corrosion rate monitored by the polarized test piece soil reference tube, self-corrosion potential monitored by the self-corrosion test piece soil reference tube, and low-voltage alarm signals output by the power supply, and also processes the electrical signals output by the Mark signal sensor to generate positioning commands that trigger the GPS positioning module to output position signals; this invention achieves high efficiency, high precision, high integration, and high intelligence in oil and gas pipeline operation and maintenance management, improving the accuracy of pipeline corrosion detection and cathodic protection detection and the level of intelligent management.

The invention relates to the technical field of intelligent household appliances, particularly provides an air conditioner control method and an air conditioner, and aims to solve the problem that an existing air conditioner still reports a high-voltage fault after being shut down due to high-voltage alarm and restarted. The control method comprises the steps that the opening value X of a throttling valve and / or the working frequency Y of a compressor are / is obtained when the air conditioner is shut down; the air conditioner is restarted, the opening degree X of the throttling valve is corrected to obtain the corrected opening degree W, and / or the working frequency Y of the compressor is corrected to obtain the corrected frequency V; when the air conditioner runs, the opening degree of the throttling valve is not smaller than the corrected opening degree W and / or the working frequency of the compressor is not larger than the corrected frequency V; wherein W > X and / or V < Y. Through the method, the opening value of the throttle valve and / or the working frequency of the compressor can be corrected, so that the pressure of a refrigerant and the temperature of an indoor heat exchanger are reduced, and the problem that a high-voltage fault is still reported when the air conditioner is started again is effectively solved.

The invention discloses a helmet night vision goggles battery box capable of displaying battery electric quantity and alarming battery low voltage, which comprises a shell, a side plate, a battery bin assembly, an electric quantity indicating assembly, an electrode contact assembly and a turnover locking assembly, the side plate is fixedly connected with the shell, the battery bin assembly, the electrode contact assembly and the turnover locking assembly are respectively arranged on the shell, and the battery bin assembly is fixedly connected with the side plate. The battery box is arranged on the side plate and used for installing a battery, supplying power to the helmet night vision goggles and conducting power-on, power-off, overturning and position locking of the battery box, and the electric quantity indicating assembly is arranged on the side plate and used for detecting the electric quantity of the battery and giving a low-voltage alarm. The night vision goggles are light and compact in structure, small in size, light in weight, high in portability, easy to operate and capable of displaying the electric quantity of the battery and supplying power to the night vision goggles in real time, and warning indication can be given to a user when the voltage of the battery is low; meanwhile, a battery reverse-installation protection structure is designed, so that the contact between the battery cathode and the anode conducting strip can be effectively prevented when the battery is reversely installed, and the night vision goggles are prevented from being damaged.

The application discloses a voltage detection method and device of a single-line power supply transformer substation. The voltage detection method of the single-line power supply transformer substation provided by the embodiment of the application is applied to a power system and is executed by a voltage detection device of the single-line power supply transformer substation. The method comprises the following steps: acquiring parameter information of a power supply transformer substation; determining a state parameter value of the power supply transformer substation according to the parameter information; determining a voltage state of the single-line power supply transformer substation according to the state parameter value of the power supply transformer substation; and outputting a loss-of-voltage alarm signal of the single-line power supply transformer substation according to the voltage state of the single-line power supply transformer substation. The technical scheme of the embodiment of the application determines the voltage state of the single-line power supply transformer substation by acquiring the parameter information of the power supply transformer substation, confirms whether the loss-of-voltage alarm signal needs to be sent, and realizes accurate judgment on whether the single-line power supply transformer substation loses voltage, thereby preventing the single-line single transformer substation from sending the loss-of-voltage alarm by mistake during power supply via a bypass bus and during a related dispatching operation process.

The utility model relates to the technical field of lithium iron phosphate battery low-voltage alarm devices, and provides a communication-free lithium iron phosphate battery low-voltage alarm device, which comprises an equipment shell and a lithium iron phosphate battery, two groups of electric wires are fixedly arranged on the lithium iron phosphate battery, the other ends of the electric wires are fixedly provided with plugs, and the plugs are connected with the equipment shell. And a storage device for preventing a wire of the battery from being pulled apart is mounted on the equipment shell. After the battery is limited through the connecting device, the inserting block is moved to move out of the inserting groove to enter the first limiting groove, so that the L-shaped rotating plate can rotate, the L-shaped rotating plate is rotated to open the groove to expose an internal interface, a wire is wound on the wire winding rod to be stored, and then a plug is connected with the interface. The L-shaped rotating plate is rotated to reset, and the top end of the winding rod is blocked, so that the electric wire is prevented from falling off from the winding rod, and the situation that the electric wire is pulled apart is also avoided while the battery is conveniently connected.

The utility model discloses a smoke environment sudden early warning device which comprises a smoke detection port and a connecting flange, one side of the connecting flange extends out of a detection sampling pipe, the detection sampling pipe is inserted into the smoke detection port, and one side of the detection sampling pipe is provided with an active sampling detection structure; the utility model relates to the technical field of flue gas early warning devices, and in the flue gas environment sudden early warning device, a sampling detection mode is adopted to carry out flue gas environment monitoring, then a detection bypass is arranged on one side of a detection sampling pipe in a communicated mode, and a detection air pump on the detection bypass can be used for controlling the detection bypass to be opened. According to the flue gas detection device, the flue gas is actively extracted from the flue gas treatment pipeline, when the pressure in the flue gas treatment pipeline is reduced, flue gas detection can be carried out in an active gas inlet mode, then an alarm module on the flue gas sensor can be used for giving out an under-pressure alarm, and flue gas leakage is avoided.

The invention provides a voltage alarm method and device applied to a food processor, and electronic equipment, and relates to the field of food processors. The voltage alarm method applied to the food processor comprises the following steps: acquiring a motor voltage; if the motor voltage is greater than a first preset threshold value, increasing a first accumulated value; wherein the first preset threshold value is equal to the maximum input voltage value of the motor; if the motor voltage is smaller than a second preset threshold value, increasing a second accumulated value; wherein the second preset threshold value is equal to the minimum input voltage value of the motor; the first preset threshold value is greater than the second preset threshold value; if the motor voltage is smaller than the first preset threshold value and larger than the second preset threshold value, the first accumulated value and the second accumulated value are reduced; and if the first accumulated value is greater than a first preset accumulated value, or the second accumulated value is greater than a second preset accumulated value, sending a motor voltage alarm.

The application discloses a substation pressure plate potential detection method and device, an intelligent voltage meter and a storage medium. The method comprises the following steps: in response to a first voice instruction, determining the identification information corresponding to the pressure plate to be measured, wherein the first voice instruction is triggered when a target button in the intelligent voltage meter is pressed and then lifted; determining the preset voltage value corresponding to the upper and lower terminals of the pressure plate to be measured according to the identification information corresponding to the pressure plate to be measured; acquiring the actual voltage value corresponding to the upper and lower terminals of the pressure plate to be measured, and comparing the actual voltage value with the preset voltage value; and in the case that the difference between the actual voltage value and the preset voltage value exceeds a preset proportion threshold, sending voltage alarm information. The application solves the technical problem of low substation pressure plate potential detection efficiency caused by the fact that in the related art, when the pressure plate is detected, the voltage value needs to be manually compared with the table and the standard value every time, resulting in low substation pressure plate potential detection efficiency.

The invention provides an equivalent testing device, method and equipment for a Hall propulsion load of a satellite. The equivalent testing device mainly comprises a thruster equivalent module, a storage and supply equivalent module, a high-voltage switching module and an equipment monitoring method. The thruster equivalent module is used for simulating a Hall thruster unit and realizing the load characteristics of the whole satellite under various working conditions under normal temperature and normal pressure; the storage and supply equivalent module is used for simulating a propulsion control unit load and mainly comprises control signal conditioning and state acquisition of a self-locking valve, an electromagnetic valve and a pressure sensor; the high-voltage switching module is used for connecting a load simulation cabinet cable and a satellite end cable, and a high-voltage alarm sub-module and a storage and supply self-checking sub-module are designed at the same time. The equipment monitoring method is used for collecting equipment state parameters and receiving a control remote instruction. The equipment is used for checking whether the function and the performance of the satellite Hall propulsion system are normal or not, the compatibility and the expansibility are high, and the equivalent requirements of different satellite Hall propulsion systems are met by adopting universal and modular design.

A dual differential contactless current sensor uses a pair of magnetic sensors placed adjacent to a conductor, such as a metallic trace on a printed circuit board, which is conducting electrical current. The ability to detect and measure a tampering magnetic field in such a sensor is provided by a circuit that sums the outputs of the pair of magnetic sensors. The circuit can output an alarm signal, such as a programmable one-bit alarm that indicates when the external magnetic field exceeds a programmed threshold, or an analog voltage proportional to the external field. The alarm signal can be polled by additional circuitry that indicates to the stakeholders that a party is attempting to alter the power measurement.

The present invention is a voltage alarm method, which relates to the technology of the power system and is a method that can issue an alarm in a timely manner when the voltage is abnormal. According to the data of the acquisition device, this method automatically calculates the lower limit value of the current operation and the normal voltage value of the voltage operation, and then calculates the low-voltage alarm value, the unbalanced voltage alarm value, and the negative-sequence voltage alarm value based on the real-time voltage. Combining with the current mutation value, it can automatically adapt the voltage and current judgment values according to the acquired information, will not affect the judgment of the current protection under normal operation conditions, and can issue a voltage alarm in case of abnormality, thus improving the protection reliability.

The invention relates to the technical field of battery monitoring, in particular to a battery low-voltage monitoring method and a battery low-voltage monitoring system using the same, and the method comprises the steps: building a battery equivalent circuit model through a Thevenin first-order RC model, calculating the initial state load voltage of equipment, obtaining three load voltages at different times after a load is started, and determining a stable load voltage; and calculating the voltage of the battery under the first-stage and second-stage fixed resistance loads, and determining the resistance value and the open-circuit voltage of the battery according to the voltage. The maximum working load of the equipment is estimated, the final output voltage under the maximum working load is calculated by combining the battery parameters, and a low-voltage alarm signal is sent out according to the final output voltage and the preset minimum working voltage. The battery voltage can be accurately monitored, the defects of a traditional method are avoided, the equipment reliability is improved, and the service life is prolonged.

The invention discloses a battery water inflow detection control method, a memory and a processor. The battery water inflow detection control method comprises the following steps: detecting whether the insulation resistance to ground of a battery is abnormal or not; detecting whether the voltage of the battery is abnormal; detecting whether the temperature of the battery is abnormal; carrying out weighted fusion calculation according to at least two of the ground insulation resistance alarm signal Dins, the voltage alarm signal Dvol and the temperature alarm signal Dtemp to obtain the water inflow probability of the battery; and when the calculated water inflow probability of the battery is within the water inflow threshold range, judging that water enters the battery and giving a water inflow alarm. Therefore, at least two of the insulation resistance to ground, the voltage and the temperature of the battery are used as factors for judging whether water enters the battery or not, so that false alarm of water entering of the battery caused by sensor failure or aging of a single factor is effectively avoided through multi-dimensional information fusion, and problems can be found in the early stage of water entering; and thermal runaway and battery pack fire are avoided.

A volt pen 1 having a fuse holder claw clamp 4 attached to the outer surface of the pen’s body 2 and a fuse pry tool 6 which may be fixed to the end of removable battery cap 12 or the end of a rotatin

The invention relates to the technical field of millimeter wave radar power supply and power consumption detection, in particular to a low-cost millimeter wave radar power supply system electric quantity detection method. Filtering the battery voltage signal and realizing stable sampling; establishing a mapping model of voltage and electric quantity and performing dynamic judgment; according to the electric quantity grade, driving an indicating lamp to realize visual display and provide an undervoltage alarm; and the average energy consumption is reduced through a low-power-consumption detection mode. According to the method, an analog-to-digital conversion channel of a single-chip microcomputer is used for obtaining battery voltage after voltage division, and stable input is obtained by combining hardware filtering and a mode of removing abnormal values through multiple times of sampling; when the electric quantity is in different grades, the indicating lamp outputs according to different preset stroboscopic strategies, and the stroboscopic frequency corresponding to the low electric quantity grade is higher than the medium electric quantity grade; and when the under-voltage threshold is triggered, a control signal is output to link energy-saving or shutdown protection, so that the cost, the stability and the safety are considered.

The invention discloses a battery alarm method, equipment and device, and the method comprises the steps: firstly obtaining the current battery monitoring data of a target battery pack, the current battery monitoring data comprises the battery pack voltage, the battery pack current, and the single voltage of each single battery, and then obtaining the battery alarm data of the target battery pack based on the battery pack current and the single average voltage; the method comprises the steps of determining a battery state of a target battery pack, then determining a voltage alarm threshold value corresponding to the battery state based on a preset corresponding relation, finally comparing target monitoring data with the voltage alarm threshold value, and giving an alarm according to the comparison, and the target monitoring data comprises a battery pack voltage or a target monomer voltage. The voltage alarm threshold value is determined based on the battery state, that is, different battery states correspond to different voltage alarm threshold values, and different voltage alarm threshold values are adopted for alarming under different battery states, so that the alarm accuracy can be improved, the service life of the battery can be prolonged, and the safety of the battery can be improved.

The utility model relates to the technical field of equipment monitoring, in particular to an electric heat tracing equipment monitoring system and a to-be-heat-traced equipment system. The electric heat tracing equipment monitoring system comprises a first temperature sensor, a current transformer, a voltage transformer, a data processing module and an alarm module. The first temperature sensor, the current transformer and the voltage transformer are respectively used for monitoring the first working temperature, the working current and the working voltage of the electric tracing band in real time; the data processing module comprises a first processing module, a second processing module and a third processing module. Through the above arrangement, the data processing module analyzes and processes the first working temperature, the working current and the working voltage of the electric tracing band and then transmits the first working temperature alarm information, the working current alarm information and the working voltage alarm information to the alarm module, so that comprehensive real-time monitoring and fault diagnosis of the electric tracing system are realized. And the reliability and the safety of the system are improved.

1. Name of the design product: current limiting module. 2. Use of the design product: to limit the current when the battery triggers over-voltage alarm or charging over-current to protect the battery. 3. Design points of the design product: in shape. 4. Picture or photo that best shows the design points: perspective view 1.

The invention discloses a line detection system, an electronic device and a method, and relates to the field of electronic circuits, a power supply assembly is configured to output a preset power supply voltage, and a main detection assembly comprises a first detection circuit and a second detection circuit. The first detection circuit is configured to obtain a first detection result according to the first digital voltage obtained in the first detection circuit, and the second detection circuit is configured to obtain a second detection result according to the second digital voltage obtained in the second detection circuit; the input end of the recheck supplementary circuit is electrically connected with the output end of the power supply assembly, and the recheck supplementary circuit is configured to determine a fault line according to the first detection result, the second detection result and a third detection result in the recheck supplementary circuit when the comparison results of the first detection result and the second detection result are different. According to the invention, the problems of low voltage alarm detection reliability, weak anti-interference capability and single alarm mechanism in the prior art are solved, and redundancy detection and accurate judgment of voltage alarm are realized through three independent detection lines and an intelligent cooperative judgment mechanism.

The utility model discloses a voltage monitoring alarm circuit of an atmospheric transmissometer transmitter, which comprises a voltage dividing unit, a voltage stabilizing and current limiting unit, a filtering unit, a chip NE555, an auxiliary adjusting unit, an alarm unit and a protection unit, the other end of the voltage dividing unit is connected with one end of the voltage stabilizing and current limiting unit, the other end of the voltage stabilizing and current limiting unit is respectively connected with a THR pin end and a TRI pin end of the chip NE555, one end of the auxiliary adjusting unit is respectively connected with the other end of the voltage stabilizing and current limiting unit and the TRI pin end of the chip NE555, one end of the alarm unit is connected with an OUT pin end of the chip NE555, and the other end of the alarm unit is connected with an OUT pin end of the chip NE555. One end of the filtering unit is connected with the CON pin end of the chip NE555; when the voltage of the monitored end of the atmospheric transmissometer is monitored to be lower than the voltage alarm threshold value, the chip NE555 controls the alarm unit to give an alarm.

The utility model relates to a rolling mill oil pump control system, including an oil supply circuit, a shutdown control circuit and a low-pressure alarm circuit; the oil supply circuit is provided with an oil pump and a pressure sensor, the pressure sensor is used to determine the oil pump pressure; the pressure sensor is respectively connected to the low-pressure alarm circuit and the shutdown control circuit; the low-pressure alarm circuit is used to alarm when the oil pump pressure is lower than a first pressure threshold; the shutdown control circuit is used to control the rolling mill device to shut down when the oil pump pressure is lower than a second pressure threshold. The utility model can avoid direct shutdown due to too low pressure, issue an early warning when the pressure drops to a certain value, and remind the operator to check the hydraulic system in advance, thereby extending the service life of the roller.

The invention provides a high-pressure micro-fog main machine, and relates to the technical field of humidification. The high-pressure micro-fog main machine comprises a main machine box body; a water inlet pipe, a water inlet electromagnetic valve, a pressure switch and a pressure gauge which are connected in sequence are arranged in the host box body; a control system board is also arranged in the host box body; a terminal, a power switch and a controller which are electrically connected are arranged in the control system board; the control system board is electrically connected with the water inlet electromagnetic valve, the pressure switch and the pressure gauge. A touch screen is arranged on the surface of the mainframe box body, and the touch screen is electrically connected with the control system board. High-voltage alarm information, low-voltage alarm information and maintenance early warning information can be displayed, the host is prevented from being damaged, and the service life of the host is prolonged; the motor current, the motor frequency, the output voltage and the motor rotating speed can be displayed, and the real-time running state of the motor can be checked conveniently.

The utility model discloses an under-voltage alarm circuit of a refrigerator and the refrigerator, the under-voltage alarm circuit comprises a voltage detection circuit which comprises a first voltage stabilizing diode, a second voltage stabilizing diode and a first switch circuit; the cathode of the first voltage stabilizing diode is connected with the positive output end of the filtering and rectifying circuit; the anode of the first voltage-stabilizing diode is connected with the cathode of the second voltage-stabilizing diode through the first current-limiting resistor, the anode of the second voltage-stabilizing diode is grounded, the cathode of the second voltage-stabilizing diode is connected with the control end of the first switching circuit, and one end of a switching path of the first switching circuit is connected with the direct-current power supply through the pull-up resistor. The other end of the switch path of the first switch circuit is grounded; the alarm circuit comprises a second switch circuit and an alarm; the control end of the second switching circuit is connected with one end of the switching path of the first switching circuit, and the switching path of the second switching circuit is connected in series in the power supply loop of the alarm. The device can give an alarm prompt in time when the mains supply is under-voltage so as to inform a user in time.

The invention provides a variable pitch backup power supply system of a wind turbine generator and the wind turbine generator. A super capacitor assembly and a fault energy release assembly are electrically connected and in signal communication with a charger assembly through a primary power cable and a secondary signal cable; the super capacitor assembly is formed by connecting a plurality of super capacitors in series, each capacitor in the module is provided with a voltage-sharing circuit, and the super capacitor assembly is integrated with an over-temperature alarm loop and an over-voltage alarm loop; the charger assembly primary loop converts external input alternating current into direct current meeting the charging requirement of the super-capacitor assembly, and the charger assembly secondary loop is integrated with a single-chip microcomputer, collects system parameters and calculates the state of the super-capacitor. A high-power resistor of the fault energy release assembly is connected with the super capacitor assembly through a circuit breaker and a contactor in sequence to form an energy release loop; the charger assembly controls on-off of a contactor coil through the digital quantity output signal so as to control opening and closing of an energy release loop. The whole system can instantly provide sufficient electric energy for the variable pitch driver.

The invention discloses a power distribution network single-phase earth fault positioning and protection method and system, and the method comprises the steps: collecting the zero-sequence voltage and three-phase current traveling waves of each power distribution switch through a power distribution terminal, and transmitting zero-sequence voltage alarm information when determining that a power distribution line has a single-phase earth fault according to the zero-sequence voltage, the wave head moment of the three-phase current traveling wave is extracted as a fault feature; and the power distribution main station determines target power distribution switches at the two ends of the fault according to the line topology of the power distribution line, the zero-sequence voltage alarm information and the fault characteristics, controls the target power distribution switches to be switched off and controls the corresponding interconnection switches to be switched on so as to isolate the fault. According to the method, the single-phase earth fault in the power distribution network is quickly and reliably diagnosed only by the zero-sequence voltage and the high-frequency current traveling wave, fault isolation and self-healing are automatically carried out, the fault influence is reduced, external interference on diagnosis is small, the fault-tolerant rate is high, equipment transformation is not needed, and the method is easy to implement.

The utility model discloses a portable miniature complete debugging instrument, which relates to the technical field of low-voltage complete product debugging, and comprises a three-phase four-wire power supply, the output end of the three-phase four-wire power supply is connected with a miniature circuit breaker, and the output end of the miniature circuit breaker is connected with a power indicating lamp. The output end of the power indicating lamp is connected with an A-phase control circuit, a B-phase control circuit and a C-phase control circuit, and each of the A-phase control circuit, the B-phase control circuit and the C-phase control circuit comprises a high-low voltage test circuit and a capacitive-inductive circuit. The three-phase four-line voltage and three-phase current tester is small in size, light in weight, complete in function and convenient to carry, can provide three-phase four-line voltage and three-phase current, can provide both capacitive current and inductive current, marks current polarity, can boost and reduce voltage, and can be used for overvoltage and undervoltage alarm test. The debugging platform can be basically used as debugging equipment and tools for low-voltage electric appliance product production and can also be used as a debugging platform of complete equipment, and debugging of the complete equipment is facilitated.

The utility model relates to the technical field of high-voltage alarm, in particular to an alarm system for a static rod, which comprises a power supply device, an electronic rod, a detection device and an alarm device, a first power supply component is mounted at one end of the power supply device far away from the electronic rod, and a first connector is arranged at one end of the electronic rod close to the power supply device. A second connector is arranged at one end, far away from the first connector, of the electronic rod, and a rotatable sensitive adjusting part is arranged on the detection device. And the detection device is connected with the electronic rod through the second cable, so that working parameters such as voltage of the electronic rod can be accurately obtained in real time. And the detection threshold value can be flexibly adjusted by the rotatable sensitive adjusting piece according to actual requirements. And when the voltage of the electronic rod is lower than an adjustment value, the detection device can quickly transmit a signal to the alarm device through the third cable, so that quick fault early warning is realized, and production accidents or product quality problems caused by faults of the electrostatic rod are reduced.

The invention relates to the field of power construction auxiliary equipment, in particular to an anti-electric shock early warning full duplex intercom device and system, the top of a second cavity is provided with an unfolding cavity, and a voltage alarm assembly comprises a sliding controller, a supporting plate, a first polar plate, a second polar plate, a first elastic piece and an alarm module; the sliding controller is used for controlling the supporting plate to slide up and down. The first polar plate is fixed to the supporting plate. The second polar plate is arranged on one side of the first polar plate in a sliding mode. The first elastic piece is arranged between the first polar plate and the second polar plate. The alarm module is connected with the first polar plate and the second polar plate. When the sliding controller controls the moving channel on the supporting plate to unfold the cavity, the second polar plate is unfolded under the action of the first elastic piece to perform electric field detection, and an alarm is given through the alarm module. And an electric field near the device can be detected and early warned in the working process, so that an electric shock event is avoided, and the construction safety degree is improved.