581results about "Arrangements responsive to undervoltage" patented technology

The invention discloses a 5G base station power supply state intelligent monitoring system and method, and belongs to the technical field of intelligent monitoring. According to the system, operation parameters of a 5G base station power supply are acquired in real time through the data acquisition module, and after the operation parameters are processed by the signal conditioning and conversion module, the master control processing unit analyzes digital signals in real time, detects abnormal states and generates alarm information. The communication module is responsible for data transmission and instruction receiving, and the power management and safety protection module provides overvoltage, undervoltage, overcurrent and short circuit protection and triggers emergency measures. The artificial intelligence analysis module performs fault prediction and performance optimization based on historical data and real-time data, and the remote monitoring terminal realizes data visual monitoring and management. According to the invention, the real-time performance and accuracy of monitoring are improved, unified management of multiple base stations is realized, the operation and maintenance cost is reduced, and stable operation of a 5G communication network is guaranteed.

The invention provides an intelligent socket control system and method based on an overvoltage and undervoltage protector, and relates to the technical field of intelligent socket control. Load bias utility of an intelligent socket under different working conditions is extracted, load attribute identification is performed on voltage state information, and a load identification tag of a load side in an intelligent socket access circuit is generated; determining a voltage out-of-limit level of the voltage at the front end of the intelligent socket in an overvoltage and undervoltage state; after the dissimilatory breaking criterion is executed to cut off a load power supply loop, a reset response strategy corresponding to the voltage at the front end of the intelligent socket is generated, and then a tolerance adaptation rule of the voltage at the front end of the intelligent socket when the overvoltage and undervoltage fault is removed is determined; and performing adaptive resetting on the power supply planning table of the power supply state in the current intelligent socket access circuit according to the voltage out-of-limit level and the tolerance adaptation rule. According to the invention, differentiated adaptive control can be carried out on load power supply under the activation of an overvoltage and undervoltage protection mechanism, so that the adaptability of the intelligent socket to complex working conditions is improved.

The embodiment of the invention provides a circuit protection device and a chip, and the device comprises a detection module which is used for detecting whether the voltage of a power supply exceeds a voltage protection threshold, and outputting a low-level signal to a time hysteresis control module when the voltage exceeds the voltage protection threshold; if not, a high-level signal is output to the time hysteresis control module; the time hysteresis control module is used for receiving the low-level signal output by the detection module and controlling an MOS tube in the time hysteresis control module to be turned off; and the control module is used for receiving the high-level signal output by the detection module, timing and controlling the MOS tube to start when the timing time reaches the preset time, so that the problem that the power supply end fluctuates between a protection mode and a normal working mode when the input power supply rapidly fluctuates in the overvoltage and power failure protection circuit in the related technology is solved. In addition, common simple devices are needed for implementation, the cost is low, and the reliability is high.

The invention provides a software and hardware cooperation power supply protection circuit of a power distribution automation terminal, which comprises a power supply input protection circuit, a voltage conversion circuit, a power failure detection circuit, a voltage maintenance protection circuit and a clock backup battery protection circuit, and is characterized in that the power failure detection circuit adopts a photoelectric isolation technology to monitor a power supply input state in real time; when it is detected that the power supply is disconnected or powered down, a specific level signal is output, and power down event detection is triggered; on the software level, the function of a power failure detection pin is defined in an equipment tree, the power failure detection pin is configured to be an interrupt trigger pin, the power failure detection pin is initialized, interrupt is requested, an interrupt trigger condition is set to be level change, and a power failure detection event is triggered when the interrupt trigger condition occurs. According to the method, system damage caused by accidental power failure is eliminated in a software and hardware combination mode, the reliability of the terminal is remarkably improved, the service life of the terminal is remarkably prolonged, the software has enough time to complete file operation through power failure protection, and therefore the purpose of protecting the file system is achieved.

The invention discloses a high-voltage pre-modulation circuit. The high-voltage pre-modulation circuit comprises a port protection circuit, a self-starting biasing circuit, a reference circuit and a step-down modulation circuit, the port protection circuit has a negative voltage protection function, when the port voltage is negative voltage, voltage transmission can be blocked, and internal devices are prevented from being damaged; the self-starting bias circuit is quickly conducted when the power supply is powered on, provides bias current for the port protection circuit and provides bias voltage for the step-down modulation circuit; the reference circuit takes the output voltage of the step-down modulation circuit as the power supply voltage, and the output reference voltage of the reference circuit is the reference level of the step-down modulation circuit; the step-down modulation circuit can realize the function of converting high power supply voltage into low voltage VOUT, and provides stable power supply voltage for other modules in the integrated circuit. The high-voltage pre-modulation circuit with the negative-voltage protection function has the negative-voltage protection function, only one path of power supply voltage is needed, high reliability is achieved, and meanwhile the system design difficulty is lowered.

The present application discloses an intelligent power protection control method, device, and intelligent power supply. The method includes: performing curve fitting on i historical voltages to obtain a historical voltage curve; performing curve fitting on j historical currents to obtain a historical current curve; determining a first voltage curve of the intelligent power supply in a future time period according to the historical voltage curve; determining a first current curve of the future time period according to the historical current curve; determining an overvoltage protection threshold curve and an undervoltage protection threshold curve according to the load power curve of the future time period; determining an overcurrent protection threshold curve according to the load power curve; determining a target critical point according to the first voltage curve, the first current curve, the overvoltage protection threshold curve, the undervoltage protection threshold curve, and the overcurrent protection threshold curve; and controlling a protection device to perform a power protection operation corresponding to the target critical point. The present application is beneficial to improving the safety of the intelligent power supply.

According to the standby power system and the starting control method thereof provided by the invention, when the grid-connected and off-grid controller is powered off, the first control circuit provides the low-level signal to the second control circuit of the inverter as the off-grid signal, so that when the voltage of the direct current side of the inverter meets the condition of the starting voltage value of the inverter, off-grid black start is preferentially carried out, and the starting time of the inverter is shortened. And after starting is completed, off-grid operation outputs alternating current voltage to quickly supply power to a standby power load. And if the inverter detects that the voltage of the alternating current side meets the condition of the minimum off-grid output voltage value and receives a high-level signal as a grid-connected signal before the inverter is started in an off-grid mode to output the alternating current voltage, the inverter can be directly switched to be started in a grid-connected mode, and rapid starting is completed. When the voltage of the power grid meets the under-voltage protection voltage value condition, the grid-connected and off-grid controller can be directly started in a grid-connected mode to run in a grid-connected mode, the first switching circuit is closed, a high-level signal is sent to serve as a grid-connected signal, power is rapidly supplied to the standby power load, and meanwhile voltage is provided for the alternating current side of the inverter.

The invention provides an intelligent voltage protection system and method based on the Internet of Things, and the method comprises the steps: carrying out the equipment action recognition according to behavior association data, and obtaining an equipment external action recognition result of target equipment; performing equipment action recognition according to the internal voltage state data to obtain an internal action recognition result of the target equipment; performing behavior consistency check according to the external action recognition result and the internal action recognition result of the equipment to obtain an external behavior consistency degree, performing dynamic behavior prediction on the target equipment according to the image sensing data and the external behavior consistency degree, and determining an equipment behavior prediction result; the equipment voltage protection threshold value is dynamically adjusted according to the behavior prediction result, intelligent voltage protection is performed on the target equipment through the equipment voltage protection threshold value, the behavior prediction of the target equipment can be performed through the image sensing data of the Internet of Things, and the voltage protection threshold value is dynamically adjusted according to the behavior prediction result. Therefore, voltage false alarm caused by frequent start and stop is avoided.

The invention relates to the technical field of battery charging protection, and discloses a cathode N-MOS rapid turn-off circuit and a DC power supply. The cathode N-MOS rapid turn-off circuit comprises an overvoltage and undervoltage protection unit and a rapid turn-off unit. The quick turn-off unit comprises a switch tube QT3, a switch tube QT4 and a switch tube QT6; when the input voltage of the overvoltage and undervoltage protection unit exceeds the overvoltage threshold value or is smaller than the undervoltage threshold value, the switching tube QT6, the switching tube QT3 and the switching tube QT4 are all switched off or not switched on, and then the main N-MOS switching assembly is controlled to be switched off or not switched on. According to the invention, when the input voltage of the power transmission line is abnormal (overvoltage / undervoltage), the main N-MOS switch assembly can be rapidly turned off, the control logic is simple and reliable, turn-off delay basically does not exist, and the impact of transient large current on a device can be effectively inhibited.

The invention relates to a passive wireless temperature sensor circuit, which comprises a transceiving antenna, an RF-DC rectifier circuit, a temperature sensing circuit and a backscatter circuit, the RF-DC rectifier circuit receives external radio frequency energy based on the transmit-receive antenna and then outputs direct current for power supply. The temperature sensing circuit comprises a complementary absolute temperature voltage generator and a ring oscillator; the complementary absolute temperature voltage generator comprises an MOS tube and generates CTAT voltage based on temperature characteristics of the MOS tube. The ring oscillator converts the CTAT voltage into an oscillation frequency signal of the ring oscillator and then outputs a square wave frequency signal with a negative temperature coefficient; the backscattering circuit backscatters the square wave frequency signal through the transceiving antenna; the CTAT key generation circuit built by the MOS tube generates CTAT voltage, a temperature frequency conversion chain is built through the CTAT voltage and the ring oscillator, temperature information is converted into frequency information of the oscillator, the power consumption of the temperature sensing circuit can be effectively reduced, and meanwhile the voltage coefficient of the CTAT voltage is increased by combining the temperature characteristic of the MOS tube.

The embodiment of the invention provides a method and equipment for processing a low-voltage protection constant value in a regional power grid, and a medium. The method comprises the steps of determining a dynamic topological feature vector of power grid equipment in a preset time window, dynamic topological feature data corresponding to the dynamic topological feature vector and a contact relation matrix representing the connection tightness degree between the power grid equipment according to the connection relation and feature data of the power grid equipment in a power grid at different time points; inputting the contact relation matrix, the operation parameters in the power grid and the historical fault data into a generative adversarial network to obtain simulated fault data output by the generative adversarial network; according to the extended training data set, an initial target constant value solution set is obtained through multi-target optimization solution; the extended training data set is obtained according to the simulated fault data and the historical fault data; and performing compliance verification on the initial target constant value solution set to obtain a target constant value solution set. The method is used for improving the accuracy of obtaining the constant value, so that the operation effect of the power grid during operation is improved.

An air conditioner includes an indoor unit and an outdoor unit. The air conditioner includes a relay that is in one of a short-circuit state or a released state according to a switching signal to be supplied, a voltage detection circuit that detects a voltage, and a relay switching circuit that outputs a switching signal for causing the relay to be in the released state in a case where a value of the voltage detected by the voltage detection circuit is larger than a predetermined first threshold, to the relay. The relay, the voltage detection circuit, and the relay switching circuit are disposed in the indoor unit or the outdoor unit.

The invention relates to the technical field of photovoltaic modules, in particular to a hot spot automatic circuit breaker and a photovoltaic module with the same. The hot spot automatic circuit breaker comprises a main circuit output end M, a battery string access end N, a main circuit connection circuit, a bypass circuit, a short-circuit circuit, a voltage detection module V, a current detection module A1, a current detection module A2, a state switching module, a current comparison module, a switch S1, a switch S2 and a switch S3. According to the photovoltaic module with the hot spot automatic circuit breaker, the circuit structure is optimized, the photovoltaic cell string with the hot spot fault is bypassed and disconnected from the main circuit, the temperature rise of the hot spots is prevented, the heat of the hot spots has time to be dissipated in time, and therefore the temperature on the cell pieces can be greatly reduced when the hot spots occur; whether the hot spots are eliminated or not is detected regularly, and the main circuit is accessed in time after elimination; the preset value of the voltage V can be set so that intervention can be earlier than a bypass diode scheme when a hot spot occurs.

The utility model provides an inverter bus capacitor overvoltage and undervoltage protection circuit, and relates to the technical field of electronic circuits, a bus voltage sampling module of the technical scheme of the utility model obtains a sampling signal of bus voltage, and provides an accurate data basis for subsequent analysis. And then, the bus voltage analysis module judges the sampling signal, and compares a sampling voltage value with a preset voltage range, so that a voltage abnormal condition can be accurately identified. When a sampling voltage value exceeds a preset range, the bus voltage analysis module outputs a low-level signal, and the design enables the system to quickly respond to voltage fluctuation. And finally, when the bus overvoltage and undervoltage protection execution module receives the low-level signal, a protection measure is taken immediately, the inverter is controlled to stop working, and an alarm signal is output. The three-module linkage design improves the accuracy of voltage detection, gives consideration to the overvoltage and undervoltage conditions, and comprehensively improves the safety and reliability of the inverter.

The present application relates to a power failure detection circuit, the circuit comprises: a rectifying circuit for full-wave rectifying an alternating current voltage so as to obtain a first voltage; a switching circuit for converting the first voltage into a periodic voltage pulse; and a judgment circuit for providing an output signal to a fan control circuit for closing a fan when the periodic voltage pulse is not received within a preset time period, and providing the output signal to a micro-control unit for closing an electronic expansion valve. The present application also relates to a control circuit for a variable refrigerant flow VRF system.

A power loss protection circuit includes: a first input terminal configured to receive, as an input voltage, a voltage generated by an intermediate bus converter configured to step down a DC bus voltage; a second input terminal configured to receive the DC bus voltage; a capacitor connection terminal to which an external capacitor is to be connected; an output terminal to which a load is to be connected; a first switch connected between the first input terminal and the output terminal; a charging circuit connected between the second input terminal and the capacitor connection terminal; and an internal converter configured to step down a voltage of the capacitor connection terminal and stabilize an output voltage generated at the output terminal to a target level.

The invention discloses a DC / DC module and a vehicle. The DC / DC module comprises a power conversion circuit, an over-current protection circuit, an under-voltage protection circuit, an AND gate circuit and an anti-backflow circuit, the first input end of the overcurrent protection circuit is connected to the first end of the anti-backflow circuit, and the output end of the overcurrent protection circuit is connected to the input end of the power conversion circuit; the input end of the under-voltage protection circuit is connected to the first end of the anti-backflow circuit or the second input end of the over-current protection circuit; the first input end of the AND gate circuit is connected to the output end of the overcurrent protection circuit, the second input end of the AND gate circuit is connected to the output end of the undervoltage protection circuit, and the output end of the AND gate circuit is connected to the second end of the anti-backflow circuit; the output end of the power conversion circuit is connected to the first end of the anti-backflow circuit or the second input end of the overcurrent protection circuit. And the reliability of the anti-backflow circuit is improved.

Systems and methods described herein can involve for a selection of one or more lines in a grid to bring down, executing a load shedding optimizing process configured to determine optimal loads in the grid that can be shed while maintaining grid stability, the determination of optimal loads is based on one or more lines chosen to be brought down, load importance, and identification of loads in the grid that can be partially or completely shed; and executing a load shedding process to shed loads in the grid according to the optimal loads in the grid topology to shed.

The present invention relates to a method for checking the switch-off capability of an electronic fuse which is arranged between a voltage source and a consumer. The method includes monitoring a voltage at the consumer, switching the electronic fuse to a non-conductive state, and checking whether the voltage at the consumer drops to a threshold voltage within a set time. The present invention also relates to a system for checking the switch-off capability of an electronic fuse. The system includes a voltage source, a consumer, an electronic fuse between the voltage source and the consumer, a voltage measuring device to measure the voltage at the consumer, and a checking unit. The checking unit monitors the voltage at the consumer via the voltage measuring device, switches the electronic fuse to a non-conductive state, and checks whether the voltage at the consumer drops to a threshold voltage within a set time.

The invention discloses a full gallium nitride integrated half-bridge circuit, a chip and electronic equipment, and the circuit comprises an undervoltage and overvoltage protection circuit, an overcurrent protection circuit, a dead time generation circuit, a signal control circuit, a level shift circuit, a high-side driving circuit, a low-side driving circuit, a high-side gallium nitride transistor and a low-side gallium nitride transistor. The half-bridge circuit has the following effects: the half-bridge circuit can automatically disconnect the level shift circuits of the high-side gallium nitride transistor and the low-side gallium nitride transistor by generating an automatic locking logic signal, so that the problems of mis-opening and mis-closing of a high-side power device in a high-frequency switching signal switching process are reduced; the driving circuit adopts a bootstrap driving structure to ensure rail-to-rail output and simultaneously has low transmission delay, and in addition, the driving circuit is integrated with overvoltage, undervoltage and overcurrent protection circuits to ensure high reliability of the half-bridge circuit during working.

The utility model discloses a control circuit of a domain controller, and relates to the technical field of circuits. Comprising a voltage monitoring circuit located between the storage battery and the primary power supply. The voltage monitoring circuit comprises a first processor, a first voltage division circuit and a first switch. When the voltage of the first input end is detected to be greater than or equal to an overvoltage threshold value, or the voltage of the second input end is detected to be smaller than an undervoltage threshold value; and controlling a first output end of the first processor to output a signal for controlling the first switch to be in an off state, and controlling a third output end of the first processor to output a signal for representing that the voltage of the storage battery is in an under-voltage or over-voltage state to a system-on-chip. Under-voltage or over-voltage detection of the storage battery is achieved, and when it is detected that the storage battery is in an under-voltage or over-voltage state, the first switch is controlled to be turned off, that is, under-voltage turn-off of the power supply can reduce static power consumption of a product during under-voltage; the overvoltage turn-off power supply prevents each stage of power supply from being damaged, and the reliability of the domain controller and the product is improved.

The invention relates to a wide voltage input protection control circuit and a vehicle-mounted terminal. The circuit comprises an anti-reverse connection module, an overvoltage protection module, an under-voltage protection module and a control module. The anti-reverse connection module is used for generating a polarity detection result of the vehicle-mounted power supply and performing primary on-off control on a connecting line according to the polarity detection result; the overvoltage protection module is used for generating an overvoltage detection result of the vehicle-mounted power supply, the undervoltage protection module is used for generating an undervoltage detection result of the vehicle-mounted power supply, and the control module is used for performing secondary on-off control on a connecting line according to the overvoltage detection result and the undervoltage detection result; and according to the connection line combining the first-stage on-off control and the second-stage on-off control, the vehicle-mounted power supply provides stable power supply for a post-stage circuit within a preset wide voltage input range. By adopting the method, stable and safe electric energy supply can be realized in a preset wide voltage input range, and the reliability and the service life of the vehicle-mounted terminal under complex working conditions are improved.

The utility model relates to a low-cost protection circuit which comprises an input circuit, the output end of the input circuit is electrically connected with the power supply ends of a first control circuit, a second control circuit and an output control circuit at the same time, and the output end of the first control circuit is electrically connected with the grounding ends of the second control circuit and the output control circuit at the same time. The output end of the second control circuit is electrically connected with the control end of the output control circuit, and the input circuit, the first control circuit, the second control circuit and the output control circuit are all composed of discrete components. According to the scheme, the low-cost protection circuit is only composed of the two MOS tubes, the two voltage stabilizing diodes, the triode, the resistor, the capacitor and the switch, has the advantages of being simple in circuit and low in cost, and can achieve multiple protection functions of power supply overvoltage, undervoltage, reverse connection and surge current impact at the same time. The performance is reliable, an IC or an optocoupler or a single-chip microcomputer chip does not need to be arranged, programming codes are not needed, production is convenient, and the production efficiency is improved.

Devices, systems, and methods prevents backfeeding from a downstream residential power source into a commercial power grid when the commercial grid is de-energized. This helps prevent electrocution of line workers who are trying to restore power to the commercial grid such as when a consumer uses a misconfigured generator during a power outage. An indication may be provided when a consumer is attempting to backfeed on a de-energized commercial grid.

The present invention discloses a power supply system and a leakage detection device thereof, the device comprising an over-voltage and under-voltage detection circuit and a leakage detection circuit; the over-voltage and under-voltage detection circuit comprises a sampling circuit, a signal comparison circuit and an adjustable inverse time control circuit connected in sequence; the leakage detection circuit comprises a filtering circuit, an amplification processing circuit, a signal detection circuit and a delay circuit connected in sequence; the input end of the sampling circuit is connected to the power supply end of the power supply system; the output end of the adjustable inverse time control circuit is connected to the delay circuit; the input end of the filtering circuit is connected to a current transformer, and the current transformer is sleeved on the power supply end of the power supply system; the output end of the delay circuit is connected to an alarm module and / or a drive execution module. The present invention can monitor the leakage current size or overvoltage / undervoltage state in real time, and has an adaptive inverse time delay control function.

The invention discloses a photovoltaic string medium-voltage convergence system, and belongs to the technical field of photovoltaic power generation, the system realizes voltage level jump through a + / -1500V bipolar symmetric architecture, and a plurality of 1500V photovoltaic strings are configured to have positive electrodes and negative electrodes symmetrically arranged to form a medium-voltage convergence system with the total output voltage of 3000V. And meanwhile, the stability of the system is maintained through the midpoint high-resistance grounding device, and the voltage limitation of a traditional 1500V system is broken through on the premise of not changing the insulation and voltage resistance level (1500V) of the existing equipment. According to the scheme, the direct current side transmission loss and the cable cost are remarkably reduced, the confluence radius is expanded, existing photovoltaic modules, cables and matched equipment are compatible, and an efficient and economical confluence solution is provided for a large photovoltaic power station.

Aspects of the present disclosure provide a circuit (300). In some examples, the circuit includes: a first current source (302) having a terminal coupled to a first node (314) and a second terminal, a first switch (306) coupled between the second terminal of the first current source and a second node (316), a first resistor (310) coupled between the second node and a ground terminal (318), a second current source (304) having a terminal coupled to the first node and a second terminal, a second switch (308) coupled between the second terminal of the second current source and a third node (320), a second resistor (312) coupled between the third node and the ground terminal, a third current source having a terminal coupled to the first node and a second terminal, a third switch coupled between the second terminal of the third current source and a fourth node, and a third resistor coupled between the fourth node and the ground terminal.

The application relates to the technical field of power supply protection, in particular to a modular intrinsic safety protection circuit. The intrinsic safety protection circuit comprises at least one intrinsic safety protection unit, each intrinsic safety protection unit comprising: a protection control chip for monitoring input voltage and current signals and outputting on-off control signals; a power switch tube connected to the output end of the protection control chip and used for performing switching actions according to the on-off control signals; an adjustable voltage division network connected to an input power supply end and used for setting the under-voltage protection threshold or the over-voltage protection threshold of the modular intrinsic safety protection circuit by adjusting resistance values; and a replaceable current sampling resistor connected in series in a power supply loop and used for setting the over-current protection threshold of the modular intrinsic safety protection circuit. By replacing the resistors of the adjustable voltage division network and / or the current sampling resistor, the modular intrinsic safety protection circuit can be adapted to intrinsic safety power supplies of different voltage / current levels.

The application discloses a mine battery low static current discharge protection circuit with a self-locking function, comprising a detection and collection unit, an under-voltage locking unit, an over-current locking unit, a control unit, a battery start-stop unit and a low-power consumption control unit; the detection and collection unit detects the discharge current of a storage battery group, detects the voltage of the storage battery group and provides a set threshold value for the under-voltage locking unit and the over-current locking unit; the under-voltage locking unit and the over-current locking unit respectively compare the set threshold value with the detected storage battery voltage signal value and output a protection signal to the control unit; the control unit controls the main loop on-off to realize protection; the under-voltage locking unit and the over-current locking unit are used to maintain the protection state; meanwhile, the low-power consumption control unit is used to reduce the static current. The application improves the stable reliability of protection, reduces the self-discharge current of the storage battery group after protection, prolongs the storage time of the storage battery group after protection and improves the convenience of equipment use.

The embodiment of the invention discloses an under-voltage protection circuit and a switching power supply. The under-voltage protection circuit comprises a controller which is set to control a current source circuit to work when the voltage of a second node is greater than a first voltage; when the voltage of the second node is smaller than or equal to the first voltage, the current source circuit is controlled not to work; when the current source circuit is set to work, current is pulled from the voltage comparison circuit through the first node; the voltage comparison circuit is set to output a first voltage to the second node when the voltage of the switching power supply meets a first condition; when the voltage of the switching power supply meets a second condition, a second voltage is output to the second node; the output control circuit is set to control the switching power supply to output outwards when the voltage of the second node is the first voltage; and when the voltage of the second node is the second voltage, controlling the switching power supply to stop external output. The under-voltage protection circuit and the switching power supply can realize reliable starting of the switching power supply.