116results about How to "Stable current" patented technology

The invention discloses a high-voltage cable outer metal sheath grounding defect on-line monitoring method and monitoring system, which can work under the condition that a cable is not powered off, realizes on-line monitoring, and realizes on-line monitoring through the cooperation of a current sensor, a voltage sensor, a single-chip microcomputer and an upper computer. And the equipment can quickly detect when a fault occurs and is convenient for maintenance workers to timely eliminate obstacles, so that the risk of major electric power accidents is reduced. The algorithm is similar to an improved neural network algorithm and is used for diagnosing the defects of the outer metal sheath of the cable, the weight is obtained through training learning, and finally the defects of the outer metal sheath of the high-voltage cable are determined. The protection content covers each component of the technical scheme, and comprises a monitoring method, a device structure, a sensor technology, a data processing algorithm, a neural network learning algorithm and the like.

The invention discloses a single-resistor sampling method, device and system, a medium, a motor and electrical equipment, and belongs to the field of motor control. The target switching time is different from the initial switching time, but the duty ratio of the whole switch is not changed, so that the synthesized reference voltage vector is not changed, and after the initial switching time is changed into the target switching time, the difference between the first conduction time of the switch of the second phase and the first conduction time of the switch of the first phase is the preset time. The difference between the first conduction time of the switch of the third phase and the first conduction time of the switch of the second phase is preset time, the preset time is greater than or equal to the minimum sampling time, and the preset time length is smaller than the minimum sampling time, so that the sampling point is set in the preset time length of the first conduction of the switch, and the sampling point can be ensured to be in an effective vector interval. At the moment, the switched-on switch is switched on for a period of time, and other switch states are not switched, so that the current is stable during sampling, and the sampling current error is small.

The invention belongs to the technical field of medical instruments, and particularly relates to a rotating tail wire and an operation method thereof.According to the rotating tail wire and the operation method, by arranging a sliding ring rotating cylinder, a conductive wire assembly and an electrode interface assembly, knotting and winding at the tail wire are prevented, uninterrupted work is achieved, and the service life of the rotating tail wire is prolonged. And the working efficiency and the stability of current and resistance during working are ensured.

The invention discloses a pulse electrochemical crystallization coupled composite constructed wetland system which comprises an energy system, a pulse electrochemical crystallization pond and a composite constructed wetland system, and the energy system supplies energy to the pulse electrochemical crystallization pond and the composite constructed wetland system. Aquaculture wastewater firstly enters a pulse electrochemical crystallization pond, struvite (MAP) sediment is formed through electrochemical crystallization, ammonia nitrogen and phosphate in the wastewater are efficiently removed, and partial removal of organic matter is achieved. Then the wastewater enters a composite artificial wetland system, and the wastewater is deeply purified under the action of filler filtration / adsorption, microbial assimilation / conversion and plant absorption. The pulse electrochemical crystallization coupled composite constructed wetland system is compact in structure, and the defects of high energy consumption of direct-current electrochemical crystallization and low purification efficiency of a traditional constructed wetland are overcome through physical-chemical-biological multi-path coupling enhanced culture wastewater treatment.

The utility model provides an energy storage and adjustment system of a photovoltaic power station, which is specially designed for special challenges faced by the photovoltaic power station in a plateau area, such as electric power fluctuation, equipment damage, difficulty in fault processing and the like in extreme weather. The system comprises a battery prefabricated cabin and a boosting all-in-one machine, the battery prefabricated cabin comprises an energy storage battery and a confluence cabinet, the boosting all-in-one machine comprises a bidirectional converter PCS and a transformer, and storage and steady-state conversion of photoelectric energy can be effectively achieved. The system further comprises an energy management system which is connected with the energy storage battery and the bidirectional converter PCS. Besides, the battery cabin is further provided with auxiliary monitoring equipment, such as a video monitoring module, a temperature and humidity monitoring module and a fire-fighting module, which are used for monitoring and ensuring the safety and stability of the environment in the battery prefabricated cabin. The whole system is reasonable in design, stable operation of the power station can be guaranteed, possible equipment faults can be handled in time, the service life of equipment is prolonged, and the operation efficiency of the power station is improved.

The invention relates to the technical field of illumination, and discloses a road sign lamp for rescue warning, which comprises a controller, at least two lamp strip light sources, interface terminals corresponding to each lamp strip light source, and a lamp strip main belt, the tooth-shaped structure arranged at one end of the interface terminal penetrates through the plastic insulating layer of the lamp strip main belt to be electrically connected with the electric lead of the lamp strip main belt, and the corresponding lamp strip light source is assembled on the lamp strip main belt. The controller comprises a mode control chip and LED driving chips, wherein the mode control chip is used for sending a light-emitting control signal corresponding to a selected light-emitting mode to a first LED driving chip in the at least two LED driving chips so as to enable the light bar light sources corresponding to the first LED driving chip to work, and the LED driving chips correspond to the light bar light sources. Therefore, the physical connection advantage of the connecting terminal is combined with the intelligent control capability of the controller, on the basis that the interface terminal provides excellent electrical connection performance, the road sign lamp can show colorful visual effects, and the reliability, coordination and flexibility of the road sign lamp are enhanced.

The invention relates to the technical field of underwater winches, in particular to an underwater winch platform with a wireless energy supply communication system, which comprises an overwater buoy, a main floating body, underwater equipment and an underwater robot, the overwater buoy comprises a satellite communication module, a renewable energy power generation module and underwater acoustic communication equipment, the overwater buoy performs data transmission with the ground station through a satellite network, and the renewable energy power generation module comprises a solar module, a wind power generation module and a tidal power generation module. According to the invention, stable current and data transmission can be provided while pressure-resistant sealing performance is ensured in a deep sea environment, the technology effectively simplifies the slip ring structure, reduces the cost, size and complexity, and significantly improves the durability and stability of the system, thereby effectively supporting long-term and real-time marine environment monitoring requirements.

A port-reuse bidirectional charger and an application method thereof, comprising: a plurality of switching switches, a rectifier, a plurality of isolated bidirectional DC / DC converters and a charging interface; the rectifier is connected to the AC power of a power grid and is used to convert the AC power into DC power; the input sides of the plurality of isolated bidirectional DC / DC converters are connected in parallel to the rectifier, and the output sides are respectively connected to the charging interface through the switching switches; the storage battery to be charged / discharged is connected to the charging interface, and the number and connection mode of the output isolated bidirectional DC / DC converters are selected by setting the on / off of the switching switch to meet the charging and discharging power requirements of the storage battery. The switching switch is placed on the output side of the charger to realize port reuse. When the power requirements are different, different numbers of chargers can be used in parallel without redesigning the circuit, which is convenient for use.

The present invention relates to an LED driving device and an electronic device, which comprises: a power supply circuit for providing a power supply voltage, a control circuit for generating brightness indication information, a signal conversion circuit for converting the brightness indication information into a corresponding analog voltage signal, and a MOS tube arranged on a power supply circuit of an LED. Based on the transfer characteristic curve of the MOS tube, when the power supply voltage remains unchanged, the drain current of the MOS tube is controlled by controlling the voltage of the analog voltage signal applied to the gate of the MOS tube, so as to control the current variation amplitude through the LED power supply circuit within a preset range, so that the LED stably emits the brightness corresponding to the brightness indication information. The MOS tube is used as a current control device, and the current flowing through the LED is adjusted by controlling the analog voltage value applied to the gate of the MOS tube, thereby realizing brightness adjustment. The stable voltage applied to the gate makes the current flowing through the LED stable and avoids unnecessary fluctuations.

The invention discloses a rapid temperature rise test system and method for an electric energy metering box. The method comprises the following steps: controlling a power frequency power supply module to output voltage and current with set magnitudes of power frequency; controlling the output frequency of the harmonic power supply to be harmonic voltage and harmonic current with the set magnitude of the harmonic frequency with the set number of times; any bidirectional power electronic switch in each self-switching resistor module is closed; detecting the temperature of each temperature measuring point of the set electric energy metering box in real time; when the temperature of any temperature measurement point reaches a temperature set limit value, the harmonic power supply module is closed; the current amplitude of the output end of each self-switching resistor module is kept stable by adjusting the number of closed bidirectional power electronic switches in each self-switching resistor module; and continuing to detect the temperatures of all the temperature measurement points until the change of the temperatures before and after each temperature measurement point in unit time is smaller than a temperature rise threshold value. According to the invention, the temperature rise balance time is accelerated, the temperature rise sampling test time can be effectively shortened, and the temperature rise test efficiency of the electric energy metering box is improved.

An anti-fuse memory cell, an anti-fuse memory array and a memory, the anti-fuse memory cell comprising: an anti-fuse structure having a first end and a second end; the selection transistor comprises a drain electrode and a source electrode, and one of the drain electrode and the source electrode is coupled with the first end of the anti-fuse structure; and the anode of the voltage stabilizing diode is coupled with the other one of the drain electrode and the source electrode. According to the embodiment of the invention, the voltage stabilizing diode is additionally arranged in the anti-fuse memory cell and is connected with the selection transistor in series, the voltage stabilizing diode can provide stable voltage for the selection transistor, interference caused by current fluctuation can be resisted, correspondingly, the selection transistor can provide stable current for the anti-fuse structure, and the anti-fuse memory cell is more stable in performance. Therefore, the programming reliability of the anti-fuse structure is improved.

The present invention relates to a control circuit of a constant working current and a control method thereof, characterized in that the circuit comprises a constant voltage source U0, a constant current source I0, a current sampling circuit, a current adjustment circuit, and a load circuit; wherein the current sampling circuit is composed of a first resistor R1, a second resistor R2, a first NMOS tube M1, a second NMOS tube M2, and a first operational amplifier OP1; wherein the current adjustment circuit is composed of a third resistor R3, a fourth resistor R4, a third NMOS tube M3, and a second operational amplifier OP2; due to the introduction of the current sampling circuit and the current adjustment circuit, the current output of the constant voltage source can be kept constant no matter how the current Iload of the load circuit changes.

The utility model discloses a voltage stabilization anion generator, including EMI processing circuit, lightning stroke protection circuit, pulse type circuit, high and low voltage isolation circuit and rectification filter circuit, be equipped with stabilizing circuit between EMI processing circuit and lightning stroke protection circuit, be equipped with stabilizing circuit between lightning stroke protection circuit and pulse type circuit, be equipped with stabilizing circuit between high and low voltage isolation circuit and rectification filter circuit. A stabilizing circuit is arranged between the pulse type circuit and the high-low voltage isolation circuit, and relates to the technical field of negative ion generators, the stabilizing circuit is arranged between the EMI processing circuit and the lightning protection circuit, the stabilizing circuit is arranged between the lightning protection circuit and the pulse type circuit, and the stabilizing circuit is arranged between the pulse type circuit and the high-low voltage isolation circuit. The stabilizing circuit is arranged between the high-voltage and low-voltage isolating circuit and the rectifying and filtering circuit, so that the current and the voltage are stable, the release of electrons is more stable, and finally the formation of negative air ions is stable.

The invention discloses an automatic inductance compensation method for a voltage transformer withstand voltage test device, which relates to the technical field of electric energy metering and comprises the following steps: a test host applies test parameter information to a voltage transformer; parameters of the voltage transformer are collected to obtain measurement data information; calculating an optimal compensation inductance value according to the measurement data information and the test parameter information; and controlling the adjustable compensation inductor according to the optimal compensation inductance value to enable the adjustable compensation inductor to output the optimal compensation inductance value. The invention further discloses an automatic inductance compensation system for the voltage transformer withstand voltage test device. The voltage transformer test is compensated by accurately calculating the compensation inductance value, the accuracy and precision of the test are ensured, and the test efficiency and the test reliability are improved.

The utility model relates to a mercury lamp power supply device for a tester. The mercury lamp power supply device comprises an electronic trigger, a ballast and a relay, a first end of a normally open contact of the relay is electrically connected with one end of the power supply end, a second end of the normally open contact of the relay is electrically connected with a first end of the ballast, and a coil of the relay is electrically connected with the tester control end; the second end of the ballast is electrically connected with the first end of the load; the first end of the electronic trigger is connected to a line between the second end of the ballast and the first end of the load, the second end of the electronic trigger is electrically connected with the first end of the load, and the second end of the load is electrically connected with the other end of the power supply end. According to the mercury lamp power supply device for the tester, the overall structure is simple, maintenance is easy, the success rate of lightening the mercury lamp is high, and voltage and current provided for the mercury lamp after lightening are stable.

The invention discloses biomass particle intelligent integrated processing equipment which comprises a wood powder collecting trolley, a first-stage feeding machine, a drum screen, a second-stage feeding machine, a granulator and a PLC, the wood powder collecting trolley is connected with the drum screen through the first-stage feeding machine, the drum screen is connected with the granulator through the second-stage feeding machine, and the PLC is connected with the drum screen through the second-stage feeding machine. The wood powder collecting trolley comprises a frame, a propelling wheel, a propelling wheel driver, a thrust sensor, a scraper driver, a rotary scraper and a wood powder conveyor, the bottom of the rotary screen is connected with a weighing sensor, the granulator is provided with a hydraulic oil cylinder and a displacement sensor, and the hydraulic oil cylinder is connected with hydraulic oil cylinder control equipment. The device has the beneficial effects that dust is little during working, and the working environment is effectively protected; the gap adjustment is uniform and reasonable, and the working efficiency is improved; the feeding speed is automatically adjusted, the current is stable, and the failure rate of equipment is effectively reduced.

The utility model relates to a board-to-wire connector, which comprises a board end connector and a wire end connector which are mutually matched and plugged, the board end connector is provided with a board end insulating seat and a plurality of board end terminals, and the board end terminals are embedded into the board end insulating seat and are provided with blade-shaped contact parts in a side standing posture. The first fixing part of the plate end terminal is provided with two laterally-vertical elastic sheets which are in bilateral symmetry, and a welding pin is led out from each laterally-vertical elastic sheet; the wire end connector is provided with a wire end insulating seat and a plurality of wire end terminals, the wire end insulating seat and the plate end insulating seat are combined in a butt joint mode, a clamping cavity is formed in a plug-in mounting contact part of each wire end terminal, and the blade-shaped contact part is inserted into the clamping cavity and electrically connected with the plug-in mounting contact part. According to the utility model, a large contact area is obtained, the large current requirement is met, the butt joint pulling and plugging force of the male and female terminals can be effectively reduced, and the plugging implementation is more convenient; the board end connector and the wire end connector are in double plug-in connection, connection is stable, firm contact between terminals can be maintained, and current stability is maintained.

The invention discloses a closed-loop control current source circuit based on an NMOS tube, and belongs to the technical field of power electronics, when the state of a power supply or a load is changed and the current is changed, the closed-loop control current source circuit based on the NMOS tube can change the drain-source voltage of the NMOS tube through the closed-loop control of the NMOS tube in a feedback control sub-circuit, and the closed-loop control current source circuit based on the NMOS tube can change the current of the NMOS tube through the closed-loop control of the NMOS tube in the feedback control sub-circuit. Therefore, the working state of the closed-loop control current source circuit based on the NMOS tube is adjusted so as to keep the current constant. Therefore, the current source circuit provided by the invention can continuously and automatically adjust the states of the operational amplifier and the NMOS tube by continuously monitoring the value of the current flowing through the sampling resistor, ensures that the current flowing through the sampling resistor and the load is kept stable, and realizes a controllable current source.

The utility model belongs to the technical field of motor speed reducers, and particularly relates to a driving assembly and a gardening tool. The planetary reducer comprises a shell and a planet wheel assembly installed in the shell, the power input end of the planet wheel assembly is connected with an output shaft of the motor, and the power output end of the planet wheel assembly is connected with the shell; and each gear in the planet wheel assembly is a helical gear. The motor and the helical gear planetary reducer are combined to drive the garden tool to walk, helical gear meshing is more stable and smoother, the bearing capacity is higher, data collected by the encoder is more accurate, motor current is more stable, and accurate control over movement of the driving motor by the controller is better facilitated.

The utility model discloses a digital display terminal, which belongs to the technical field of high-power inverter power supplies and comprises a power supply and signal input end, a signal processing end, a chip processing end, a reference voltage end, a signal output end, a decimal point control end and a program burning end. The signal processing end, the decimal point control end, the chip processing end, the reference voltage end and the program burning end are all connected with the power supply and signal input end, and the signal processing end, the decimal point control end, the reference voltage end, the program burning end and the signal output end are all connected with the chip processing end. The utility model is widely applied to various welding devices, the output display is finer, and the readability of data is improved. The digital display terminal solves the problems of low resolution, high cost and high risk in the prior art.

The utility model relates to the technical field of lamp power supplies, aims to solve the technical problem that the existing LED lamp is poor in time delay effect, and discloses an LED gradually-bright and gradually-dark control circuit which comprises an LED assembly, a switch SW, a PNP type triode Q5 and a constant-current driver U11, a collector electrode of the triode Q5 is grounded in series through a first voltage division circuit, and the collector electrode of the triode Q5 is grounded through a second voltage division circuit. An emitter of the triode Q5 is connected to a direct-current power supply V +, an intermediate node of the first series voltage division circuit is connected with an enable end of the constant-current driver U11, the enable end is grounded through a capacitor C21, a power switch end of the constant-current driver U11 is connected with a current sampling end of the constant-current driver U11 sequentially through an inductor L3 and an LED assembly, the current sampling end is connected to the direct-current power supply V + through a current detection resistor, and the direct-current power supply V + is connected with the LED assembly. The power input end of the constant-current driver U11 is connected to the direct-current power supply V +, and the ground end of the constant-current driver U11 is grounded. Compared with an existing circuit, the constant-current driver U11 participates, so that the control precision is high, the dimming ratio is high, and the delay effect is better.

The invention discloses a conservative virtual synchronous generator impedance setting method and device and a medium, and the method comprises the steps: obtaining a first voltage reference value and a second voltage reference value through building an open-loop voltage control model; when the current flowing through the grid-forming converter is smaller than the current limiting amplitude, the voltage of the grid-forming converter is adjusted to be a first voltage reference value, and otherwise, the voltage is adjusted to be a second voltage reference value; and the resistance and inductance of the virtual impedance are controlled in a conservative feasible region. According to the conservative virtual synchronous generator impedance setting method and device and the medium provided by the invention, the voltage is correspondingly adjusted according to the numerical value of the current flowing through the grid-forming converter, and the converter can be ensured to stably operate under various power grid conditions by limiting the parameter of the virtual impedance to change within the preset range; the problem that it is difficult to conduct current limiting on a network-forming type current converter in a simple and convenient virtual impedance setting mode so as to improve the overall performance of the current converter can be solved.

A rotating electrical machine control device shifts a control system to synchronous five-pulse control when an operating point crosses a second boundary K22 from a state in which asynchronous pulse-width modulation control is being executed, and shifts the control system to the asynchronous pulse-width modulation control when the operating point crosses a first boundary K21 from a state in which the synchronous five-pulse control is being executed. The first boundary K21 is set such that the number of switching pulses per unit rotational speed by the synchronous five-pulse control immediately before the operating point crosses the first boundary K21 is smaller than the number of the switching pulses per unit rotational speed by the asynchronous pulse-width modulation control immediately after the operating point crosses the first boundary K21.

The utility model provides an LED linear driving circuit and system, and the circuit comprises a diode which is connected in series with a bus capacitor between the two output ends of a rectifier bridge; the first linear constant current module and the LED lamp are connected in series and coupled between the two ends of the bus capacitor; the second linear constant current module and the LED lamp are connected in series and coupled between the two output ends of the rectifier bridge; wherein when the input voltage is smaller than or equal to the load voltage of the LED lamp, the bus capacitor provides a first driving current for the LED lamp through the first linear constant current module; and when the input voltage is greater than the load voltage of the LED lamp, the input voltage provides a second driving current for the LED lamp through the second linear constant current module. According to the invention, better current THD can be provided by switching the driving current of the LED load, and the stability and reliability of the system are improved.

A rechargeable battery includes: an electrode assembly; a can accommodating the electrode assembly in an internal space of the can; and a cap assembly coupled to the can to seal the can. The cover assembly includes an upper cover configured to contact an external device. The upper cover includes: a base portion including a through hole at a center of the base portion; a terminal portion located farther from the electrode assembly than the base portion; and a plurality of support portions connecting the base portion to the terminal portion. The terminal portion includes a protruding portion extending outwardly from an edge of the terminal portion between adjacent support portions.

The utility model discloses novel cathode conductive rotating process equipment suitable for an electroplating process, which comprises a bottom plate and further comprises a substrate, a servo motor is mounted at the top of the substrate, a speed reducer is mounted at the power output end of the servo motor, a mercury conductive module is arranged at the top of the speed reducer, and a mercury conductive mode is adopted to replace a carbon brush for conduction. The mercury conduction mode can achieve impact of low voltage and high current, the requirements of various technological parameters of electroplating are met, in addition, mercury conduction can achieve self-lubricating, the abrasion phenomenon is avoided, the current is stable, no other pollutants exist, the consistency of product quality can be guaranteed, the mode that a PLC controls a high-precision servo motor is adopted, accurate speed regulation can be achieved, and the production efficiency is improved. Meanwhile, the servo motor is connected through the speed reducer, belt transmission is avoided, aging abrasion is avoided, and stable high-load high-precision transmission can be achieved.

The invention discloses a power supply protection method, system and equipment for a server and a storage medium, and is applied to the technical field of servers, a controller is connected with a collector and an auxiliary power supply device, and the controller, the collector and the auxiliary power supply device are all arranged at a first position outside a server shell. The power supply protection method of the server comprises the following steps: receiving an output current of a power supply of the server collected by a collector; based on the output current, judging whether the server obtains stable power supply or not; if not, the auxiliary power supply device is controlled to be in a discharging state, so that the auxiliary power supply device and the power supply jointly supply power to the server, and after it is determined that the server is stably powered, the auxiliary power supply device is controlled to stop supplying power. By applying the scheme of the invention, the current characteristics of the GPU can be effectively handled, the power supply protection of the server is realized, the stability of a power grid is ensured, and the influence of the layout space of a server mainboard is avoided.

The utility model provides a test system and device for a vehicle-mounted refrigerator, and relates to the technical field of testing, and the test system comprises a power module, a communication module, a control module and a switch module. The power module is connected with the battery; the communication module is connected with the power supply module and the vehicle-mounted refrigerator; the control module is connected with the power module and the communication module; the switch module is connected with the power supply module and the control module, when the switch module works in a first conduction state, the control module controls the vehicle-mounted refrigerator to be switched to a refrigeration test mode through the communication module, and when the switch module works in a second conduction state, the control module controls the vehicle-mounted refrigerator to be switched to a heating test mode through the communication module. According to the test system, the test mode of the vehicle-mounted refrigerator can be correspondingly and automatically changed by changing the conduction state of the switch module, and the switching flexibility is high. And the professional demand is relatively low, the operation is simple, the cost is relatively low, and batch testing of the vehicle-mounted refrigerator is facilitated.

This utility model relates to the field of door lock technology and discloses an intelligent door lock. The intelligent door lock includes a lock body, an electrical device, and an emergency power generation device. The electrical device is installed on the lock body. The emergency power generation device includes a magnet, a metal component, an emergency power storage module, and a drive module. The magnet is installed on the lock body; the metal component is located in the magnetic field of the magnet; the emergency power storage module is installed on the lock body; the input end of the emergency power storage module is electrically connected to the metal component; the output end of the emergency power storage module is electrically connected to the electrical device; the drive module is installed on the lock body; the drive module is connected to the metal component and is used to drive the metal component to reciprocate along a first direction, so that the metal component charges the emergency power storage module; the first direction is not parallel to the direction of the magnetic field lines of the magnet. The emergency power storage module can provide a stable current to the electrical device, improving the stability and reliability of the power supply, and solving the problem of poor reliability of emergency unlocking schemes in existing intelligent door locks.

The utility model relates to a backlight LED protection system. The backlight LED protection system comprises a backlight IC module and a protection module, the protection module comprises a first limiting unit and a second limiting unit, the first limiting unit and the second limiting unit are electrically connected with the backlight IC module, and the first limiting unit is electrically connected with the second limiting unit. According to the scheme provided by the invention, the backlight IC cannot be burnt out when the television is in any working mode.