569 results about "Dropout voltage" patented technology

The invention relates to the technical field of electronic circuit detection, in particular to a detection method for checking abnormal work of a lamp, which comprises the following steps: acquiring the consistency of a lighting state and voltage, extracting abnormal response, checking power supply connection and checking non-response, monitoring and controlling the relationship between output and current action starting, and analyzing response continuity. And detecting branch voltage difference change and direction, monitoring voltage jump and current response starting point performance, extracting response data, and obtaining a classification result. According to the invention, through cooperative detection of voltage and current response behaviors, in combination with path voltage difference direction change and time sequence characteristics, a load abnormal response section is identified step by step, the abnormal state identification capability is enhanced, an action time sequence cross validation mode is adopted to replace a traditional static judgment process, misjudgment interference is reduced, and manual intervention requirements are reduced; therefore, the detection process is more continuous, the related operation is universal, the method can be suitable for various lamp structures, the troubleshooting precision is improved, and the execution cost is controlled at the same time.

The invention, which relates to the technical field of energy storage and discharge, provides an energy storage and discharge system comprising a power supply input interface, a slow power-on unit, a slow power-on control unit, an energy storage unit, a start-stop control unit, a sampling unit, a detection unit, a main loop switch unit and an output interface. The power supply input interface is connected with the input end of the main loop switch unit and the input end of the slow power-on unit, the output end of the slow power-on unit is connected with the first port of the slow power-on control unit, and the output end of the main loop switch unit and the second port of the slow power-on control unit are connected with the port of the energy storage unit. The sampling unit is connected with the input end of the detection unit, and the output end of the detection unit is connected with the control end of the main loop switch unit. According to the invention, the problem of'maloperation 'protection of the power supply due to increase of the switching voltage difference in the process of switching the main loop can be avoided, and the reliability of the energy storage discharge system is improved.

The present invention provides a channel current calibration circuit for an LED driver chip and an LED driver chip, comprising: a calibration voltage generation module and multiple channel calibration selection modules. The calibration voltage generation module is configured to receive a first reference voltage generated by a reference voltage generation module and adjust the first reference voltage according to a preset voltage difference to obtain multiple calibration voltages, wherein the voltage difference between adjacent calibration voltages is the preset voltage difference. The channel calibration selection module is configured to receive the multiple calibration voltages and select a target calibration voltage from the multiple calibration voltages according to a first control signal from a digital controller, thereby calibrating the output current of the channel current generation module to a desired current value using the target calibration voltage. After the calibration voltage generation module adjusts the reference voltage to multiple calibration voltages, each channel calibration selection module selects the corresponding target calibration voltage to adjust the output current of the corresponding channel current generation module to the desired value.

Provided are a detection method, a control device, a power distribution box, and a storage medium. The detection method applied in a power distribution box includes: obtaining a real-time input alternating-current voltage and a zero-point alternating-current phase of the power distribution box within a utility power cycle; obtaining a simulated input alternating-current voltage of the power distribution box within the utility power cycle based on the zero-point alternating-current phase; determining that the real-time input alternating-current voltage is normal in response to an alternating-current voltage difference between the simulated input alternating-current voltage and the real-time input alternating-current voltage being smaller than or equal to a predetermined threshold, or determining that the real-time input alternating-current voltage is abnormal in response to the alternating-current voltage difference between the simulated input alternating-current voltage and the real-time input alternating-current voltage being greater than the predetermined threshold.

The invention discloses a three-level flexible excitation dynamic regulation and control method and system for a large-scale hydroelectric generating set, and relates to the technical field of flexible excitation control of the large-scale hydroelectric generating set, and the method comprises the steps: setting a DC bus voltage, and initializing a mapping relation between a capacitor voltage and an excitation output level; collecting operation parameters of a machine end, constructing a disturbance identification model and outputting a disturbance level; the excitation voltage output gear is set according to the disturbance level, the capacitor voltage difference is controlled, and dynamic voltage sharing is achieved by modulating the midpoint duty ratio. According to the method, through setting a bus target voltage and constructing excitation voltage output mapping, in combination with a disturbance level identification mechanism and a dynamic voltage-sharing strategy, closed-loop linkage of disturbance perception-voltage regulation-voltage difference control is realized. According to the method, the identification precision of the system on light disturbance and strong disturbance is effectively improved, the voltage stability and capacitance symmetry of the excitation system are enhanced, the overshoot risk is reduced, and the control robustness and safety of the system under extreme working conditions are improved.

The invention relates to the technical field of power electronic control, and provides a soft start control method for a three-phase PFC (Power Factor Correction), a PFC controller and a power supply system.The soft start control method comprises the steps that when a PFC start instruction is received, an initial target voltage value is set as an actual value of current bus voltage; maintaining the initial target voltage value for a first preset duration; after the initial stable state, sampling in real time to obtain the actual value of the current bus voltage, and calculating the absolute value of the voltage difference between the actual value of the current bus voltage and the current target voltage value; judging whether the absolute value of the voltage difference is smaller than or equal to a preset trigger threshold value; if yes, adding a preset voltage step value to the current target voltage value; if not, keeping the current target voltage value unchanged; and recursive control of the current bus voltage is executed circularly until the updated current target voltage value reaches the final target voltage value. According to the mode, the starting rapidity and the stability of the boosting process are balanced.

The invention provides an output negative voltage protection circuit applied to an N-type power device linear voltage regulator. The output negative voltage protection circuit comprises a voltage comparator, a current comparator, an error amplifier, a buffer driver, a power device MP, a resistor R1, a resistor R2, a resistor Rload and a capacitor Cout. The method comprises the following steps: acquiring a voltage difference between an S-pole output voltage Vout of a power device MP and a reference voltage Vos through a voltage comparator, converting the voltage difference into a current signal Ieg, and comparing the current signal Ieg with a reference current Ios through a current comparator to generate a current signal Ilim; adjusting the output of an error amplifier according to the current signal Ilim, and dynamically adjusting the G pole voltage Vgate of the power device MP; when the output voltage Vout is lower than the reference voltage Vos, the G pole voltage Vgate is pulled down to turn off the power device MP through the current signal Ilim, and protection of the power device MP is achieved.

The invention discloses a pre-charging control method, an energy storage device, electronic equipment and a storage medium. The pre-charging control method is applied to the energy storage device, the energy storage device comprises a plurality of pre-charging branches, and the pre-charging control method comprises the steps of obtaining a battery module voltage of a battery module and a device voltage of an external device; determining an equipment pre-charging branch according to the battery module voltage, the equipment voltage and the allowable voltage of each pre-charging branch; switching on an equipment pre-charging branch and timing, and acquiring a pre-charging voltage difference between the voltage of the battery module and the voltage of the equipment when the equipment pre-charging branch is switched on; and according to the timing duration and the pre-charging voltage difference, determining whether pre-charging is completed, and when pre-charging is completed, controlling the pre-charging branch circuit of the device to be switched off and controlling the charging and discharging branch circuit to be switched on. According to the embodiment of the invention, the pre-charging branch of the equipment is determined according to the voltage difference between the voltage of the battery module and the voltage of the equipment, the use requirements of users in different scenes are met, the pre-charging branch is prevented from being damaged, and the user experience is improved.

Load sharing techniques for voltage regulators. In an example, the techniques may be implemented in an LDO voltage regulator configured to provide load sharing with a single driver for internal and external pass elements using a pair of variable voltage dividers to adjust the load sharing based on load current. In other examples, a calibrated voltage source can be used to replace one of the variable voltage dividers. Calibration circuitry and methodologies for determining the value of the calibrated voltage source are also described. In still other examples, a single variable voltage divider can be used, with no calibrated voltage source, by constraining the external pass element to be weaker than the internal pass element. In any such examples, the internal and external pass elements can be implemented, for instance, with either n-type or p-type power transistors, and with similar transistor technologies or diverse transistor technologies (e.g., FETs and BJTs).

The invention discloses a voltage coupling layered power flow regulation and control method based on a dual-core phase-shifting transformer, and relates to the technical field of power flow control of a power system, and the method comprises the steps: building a phase-shifting transformer amplitude relational expression based on a voltage prediction model, and dynamically outputting an optimal gear combination to eliminate a loop closing point voltage difference; a Thevenin equivalent model is introduced to predict a bypass impulse current constraint condition, and gear optimization and impulse current verification are completed before loop closing; taking the deviation minimization of the load side voltage and a rated value as an optimization target, and predicting a voltage change track by adopting an iterative optimization mechanism and combining with a local gear action set; voltage fluctuation threshold limitation in the exit strategy is fused into an iteration process, and an exit path is synchronously optimized in voltage regulation and control. According to the method, an iterative optimization mechanism and a voltage prediction model are adopted, large-range adjustment and high-precision control of the compensation voltage are achieved, the impact current risk of loop closing operation is reduced through synchronous optimization of a pre-regulation strategy and an exit path, and the continuity and stability of power grid operation are guaranteed.

A method and device for determining a power supply voltage of a radio frequency power amplifier, a medium, and a communication device, the method comprising: determining a current environment, the current environment being selected from an alternative set, the alternative set comprising a first environment and a second environment, the noise of the first environment being less than the noise of the second environment; determining a power supply voltage of the radio frequency power amplifier in a receiving stage at least based on the current environment; wherein the power supply voltage difference in the first environment is smaller than the power supply voltage difference in the second environment, and the power supply voltage difference refers to the difference value of the power supply voltage of the radio frequency power amplifier in the sending stage and the power supply voltage of the radio frequency power amplifier in the receiving stage. Through the scheme provided by the invention, the power consumption of the radio frequency power amplifier can be reduced.

The invention provides a voltage difference monitoring device and method for a bootstrap switching power supply and the switching power supply. The device comprises a voltage difference detection module which is configured to detect the voltage difference between the two ends of a bootstrap capacitor and generate a lower tube conduction indication signal if the voltage difference does not reach a set threshold value; the lower tube forced conduction module is configured to generate a plurality of continuous pulse signals according to the lower tube conduction indication signal so as to conduct a lower transistor when the pulse signals are in high level, so that the bootstrap capacitor is charged through the first power supply voltage until the voltage difference reaches a set threshold value; and the negative current detection module is configured to send a forced turn-off signal to the lower transistor forced turn-on module and end the turn-on period, corresponding to the current pulse signal, of the lower transistor if a negative current greater than a threshold value is detected during the period of turning on the lower transistor through the pulse signal. According to the invention, high differential pressure detection precision is realized through a simple circuit structure.

The utility model, which relates to the technical field of the LED, discloses a leakage protection circuit comprising a power supply circuit, a step-down circuit, an LED circuit and a detection circuit. The input end of the power supply circuit is connected to the output pin of the power supply end, the output end of the power supply circuit is connected with the input end of the step-down circuit and the input end of the LED circuit, and the power supply circuit is used for rectifying the output power supply of the power supply end so as to output the power supply to the step-down circuit and the LED circuit; the output end of the step-down circuit is connected with the detection circuit, and the step-down circuit is used for carrying out step-down processing on the power supply output by the power circuit to output reference voltage to the detection circuit; and the detection circuit is respectively connected with the output pins of the power supply end and the LED circuit, and is used for controlling the working state of the LED circuit according to the real-time voltage difference and the real-time voltage between the output pins of the power supply end and the reference voltage output by the step-down circuit. According to the utility model, the working state of the LED circuit can be controlled according to the real-time voltage difference, the real-time voltage and the reference voltage, thereby realizing anti-creeping protection.

The invention belongs to the technical field of integrated circuits, and particularly relates to a dynamic comparator suitable for a low-voltage high-speed analog-to-digital converter, the dynamic comparator adopts a three-stage latch circuit structure to realize rapid comparison of weak input signals so as to generate corresponding digital signals, and the method specifically comprises the following steps of: in a pre-amplification stage, pre-amplification is carried out; the positive feedback effect of the cross-coupled transistor pair is utilized to efficiently convert a tiny input voltage difference (lt; 10mV) into a recognizable voltage difference, and then through two-stage regeneration of the main latch module and the auxiliary latch module, a logic level is quickly output to complete quantization judgment. The auxiliary latch stage is additionally arranged on the basis of a traditional cross coupling latch circuit, the working speed of the comparator is effectively increased under the condition that only small area overhead is introduced, and the probability that the dynamic comparator has a metastable state is greatly reduced.

The invention discloses a control device, a computer readable storage medium, a power converter and a self-checking method thereof, and relates to the technical field of power electronics. According to the power converter, before a controller controls a Boost circuit to operate, a bus voltage is controlled to rise to a preset value, so that the negative electrode of a fly-wheel diode in the Boost circuit is higher than the positive electrode by a larger voltage difference; then, detecting whether the difference between the bus voltage and the input end voltage of the Boost circuit is smaller than or equal to a preset bearing threshold value or not; if the difference between the bus voltage and the voltage of the input end of the Boost circuit is smaller than or equal to a preset bearing threshold value, it is indicated that the fly-wheel diode cannot bear a large voltage difference between the two sides of the fly-wheel diode in a normal reverse cut-off state, and then it can be determined that the fly-wheel diode in the Boost circuit has a short-circuit fault. The method belongs to a pure software scheme, does not need to increase hardware cost, and does not increase the layout difficulty of a PCB and the size of equipment.

The invention discloses a multi-path power source redundant power supply control method and system, and belongs to the technical field of power electronics, the system comprises a dynamic priority decision module, a zero-voltage-drop switching circuit and a fault safety framework, the dynamic priority decision module supports a user to customize a power source use priority rule through an MCU, and the zero-voltage-drop switching circuit is used for switching the zero-voltage-drop switching circuit to the fault safety framework. The MCU can autonomously carry out an automatic degradation and upgrading mechanism through voltage quality; according to the zero-voltage-drop switching circuit, when the MCU detects a fault of the main power supply, a target power supply pre-charging path is started, and when the target power supply is pre-charged until the voltage difference between the target power supply and the source voltage is smaller than or equal to 0.1 V, the target power supply GaNFET can be synchronously triggered to be switched on, and the pre-charging circuit and the original power supply GaNFET can be synchronously triggered to be switched off. The multi-path power supply input automatic switching circuit solves the problems of power-off risk, easy conduction loss and relatively high failure rate in the prior art, is suitable for a multi-path power supply input automatic switching system of a decoder and industrial control equipment, and is particularly suitable for a long-time uninterrupted power supply condition.

According to the buffer output control circuit, the buffer output control method and the LDO circuit applying the buffer output control circuit, the second control signal generation circuit and the second transistor are arranged, and in the dropout state, the second control signal generation circuit generates the high-level second control signal based on the error amplification signal to control the second transistor to be switched on; the potential of the control end of the power tube is pulled down to the ground, the problem of voltage loss on the control end of the power tube in the prior art is avoided, the power tube can be completely conducted in the state, the output voltage changes along with the input voltage, the voltage difference between the output voltage and the input voltage is small, and then the system loss can be reduced; and compared with the prior art, the power tube with a smaller area can be adopted to realize the same technical index. When the output voltage is in a voltage stabilization state, the second control signal generation circuit generates a low-level second control signal based on the error amplification signal to control the second transistor to be turned off, namely, in the state, the buffer output control circuit does not affect the work of the power tube.

The invention provides a transformer area latent fault identification method and system based on load data, and the method comprises the steps: employing a fault detection model, and based on the steady-state voltage difference, voltage instantaneous drop amplitude and load current in the load data of a transformer area, judging a suspected fault event in the transformer area; based on the load data of each suspected fault event, performing over-dead-zone voltage-current inverse correlation analysis and instantaneous down-frequency analysis on each suspected fault event in combination with a dynamic time warping algorithm, and determining a plurality of high-risk users corresponding to the high-risk event from the over-dead-zone voltage-current inverse correlation analysis and the instantaneous down-frequency analysis; according to the topological data of the transformer area, performing group anomaly traceability on high-risk users by using a graph neural network to determine a public fault point; resistance constant analysis is carried out on non-group high-risk users, user fault points are obtained, transformer area hidden dangers which are difficult to identify through traditional manual inspection can be effectively found, high-risk events can be accurately identified, public fault points can be deduced based on topology in combination with a graph neural network, and root cause analysis is achieved.

The invention relates to the technical field of intelligent charging control, in particular to an intelligent charging system based on steam driving, which comprises a protocol identification module, an energy efficiency calibration module, an output judgment module, a voltage stabilization regulation and control module and a rhythm planning module. According to the method, trend expression and structure identification of multi-stage charging requirements are realized through a power structure sequence label constructed by combining inter-stage voltage, current and time parameters, and regulation and control synchronism between energy input and output targets is enhanced by utilizing dynamic calibration of a ratio of steam input to power generation power; differential voltage fluctuation trend judgment and voltage change rate recognition are adopted, the recognition capacity for the stability of the energy supply state is improved, linkage adjustment of rectification conduction and the filtering rhythm is used, the output voltage response rhythm is optimized, the matching strategy of stage power and the response rate is combined, the time sequence scheduling accuracy of segmented energy supply is improved, and the energy supply efficiency is improved. And the real-time response and energy utilization efficiency in a fluctuating load scene are enhanced.

The invention discloses a parallel energy storage array battery cluster adaptive parallel operation prediction method and system, and the method comprises the steps: estimating the total current of each battery cluster during parallel operation based on a parallel operation equivalent circuit model, and determining the estimated value of the total parallel operation current during each parallel operation according to a parallel operation sequence; based on the equivalent circuit model and the parallel operation equivalent circuit model, predicting the total voltage of the direct current bus during each parallel operation; based on a parallel operation peak current model, determining p and p + 1 times of parallel operation peak current; when the p parallel operation peak current is not greater than the closed peak current tolerance value of the parallel operation contactor, but the p + 1 parallel operation peak current is greater than the closed peak current tolerance value of the parallel operation contactor, calculating the voltage difference between the total voltage measured value and the direct current bus total voltage predicted value at the starting time and the ending time of the p and p + 1 parallel operation interval time; if the pressure difference at the starting moment is not greater than the pressure difference at the ending moment, judging that the (p + 1) th parallel operation cannot be executed; on the contrary, the p-th parallel operation interval period and the p + 1-th parallel operation interval period are prolonged, and battery cluster parallel operation prediction is achieved.

The invention discloses a low-noise, high-precision and low-power-consumption tunnel magnetoresistance array type magnetic anomaly detection device, and relates to the field of geomagnetic field magnetic anomaly detection. In order to overcome the defects that in the prior art, the detection precision is insufficient, the noise level is high, power consumption is large, and long-time stable operation is difficult to consider, the technical scheme provided by the invention is that a signal acquisition and amplification circuit is composed of a plurality of triaxial tunnel magnetoresistive sensors, an isolation circuit, an instrument amplification circuit and a passive filter circuit; the master control and signal processing circuit is composed of a high-precision analog-to-digital conversion circuit, a clock circuit and a microprocessor circuit. The signal transmission circuit is composed of an Ethernet module and is used for transmitting the processed data to an upper computer; the power supply module is composed of a low-noise low-dropout voltage stabilizing circuit and a reference voltage circuit, and is used for providing a stable power supply and a unified reference voltage. The method is suitable for long-time high-precision geomagnetic anomaly detection work in geophysical exploration, national defense safety monitoring and complex environments.

The utility model provides an energy storage system, comprising a plurality of battery clusters, each of which is provided with a battery pack and a high-voltage box; a first confluence busbar and a second confluence busbar, the first confluence busbar and the second confluence busbar are respectively connected with a plurality of battery clusters in parallel, the battery clusters are connected with the first confluence busbar and the second confluence busbar through a high-voltage box, and the high-voltage box can alternatively control the connection state of the battery clusters and the first confluence busbar and the connection state of the battery clusters and the second confluence busbar; the input end of the DC-DC converter is connected with the first confluence busbar, and the output end of the DC-DC converter is connected with the second confluence busbar; the DC-DC converter provided by the utility model has the advantages that the efficiency is higher, the voltage between the battery clusters can be quickly balanced, and the battery clusters with large voltage difference can also be effectively balanced. While the voltage between the battery clusters is balanced, the use number of the DC-DC converters is reduced, and the total cost is reduced.

Load sharing techniques for voltage regulators. In an example, the techniques may be implemented in an LDO voltage regulator configured to provide load sharing with a single driver for internal and external pass elements using a pair of variable voltage dividers to adjust the load sharing based on load current. In other examples, a calibrated voltage source can be used to replace one of the variable voltage dividers. Calibration circuitry and methodologies for determining the value of the calibrated voltage source are also described. In still other examples, a single variable voltage divider can be used, with no calibrated voltage source, by constraining the external pass element to be weaker than the internal pass element. In any such examples, the internal and external pass elements can be implemented, for instance, with either n-type or p-type power transistors, and with similar transistor technologies or diverse transistor technologies (e.g., FETs and BJTs).

The invention discloses a control method and system for a comprehensive energy supply system of a double-source heat pump building, and relates to the technical field of heating, ventilation and air conditioning, and the control method comprises the following steps: collecting conductivity data, extracting a characteristic frequency component of the conductivity data, and judging the state of a phase change material through the characteristic frequency component; an adjusting instruction of the double-source heat pump is triggered according to the state of the phase change material, and a double-source heat pump energy supply mode is output; evaporation reference values are matched for different dual-source heat pump energy supply modes, the frequency of a compressor is adjusted according to the reference deviation, and a variable frequency driving signal is generated; dynamically adjusting compressor frequency and electronic expansion valve opening according to the variable frequency driving signal, monitoring inlet and outlet pressure difference of an evaporator after adjustment, and judging whether bypass valve shunting is carried out or not; a heat recovery channel is activated in bypass valve shunting, and energy recovery and energy supply regulation and control are completed. Through cooperation of conductivity characteristic frequency analysis and dynamic activation of the heat recovery channel, accurate judgment of the state of the phase change material and closed-loop regulation and control of energy flow are achieved.

The invention discloses a bypass inductor echelon current limiting topology and method for solid-state power distribution equipment, relates to the technical field of power electronic distribution, and is suitable for solid-state power controllers in the fields of aerospace, new energy automobiles and industrial automation. In order to solve the problems that when a large capacitive load is started, a current peak is likely to be generated to damage a device, and an existing current limiting scheme is low in efficiency or large in size, the topology comprises an input circuit, a main power circuit, an auxiliary circuit, a current limiting circuit, an absorption circuit and a load side circuit. According to the method, the auxiliary circuit switch tube is turned on in an echelon mode, and the main switch tube is turned on to complete starting after load voltage approaches power supply voltage and reaches a non-voltage-difference condition. According to the planar inductor integrated PCB, the size is reduced, the problem of long-term heating of a resistor is solved, the TVS overvoltage protection and RC anti-interference design are matched, the current peak is effectively restrained, the system efficiency and reliability are improved, and the high-power-density and differential-pressure-free starting requirements are met.

The invention belongs to the technical field of impact current suppression, and relates to a method and system for suppressing the impact current of a DC bus output by a DC charger, and the method comprises the following steps: collecting the output voltage of the DC bus and the required voltage of a vehicle side, and forming a voltage sequence; calculating the change rate and the pressure difference of the two; when the change rate exceeds a threshold value or the communication time sequence is discontinuous, entering voltage limiting constraint control; determining a limiting function according to the change rate and the voltage difference and updating a voltage reference value; adjusting the output voltage according to the updated reference value; and continuously executing voltage reference value updating and output adjustment until the output and the required voltage tend to be consistent, then exiting the voltage limiting constraint, and continuously performing dynamic adjustment according to the required voltage. According to the technical scheme, through dynamic monitoring and voltage difference constraint on the bus and the required voltage, voltage limiting adjustment and reference value smooth updating during sudden change are achieved, the impact current peak value is effectively restrained, and it is ensured that the voltage is stable, the current is limited, and the system operates stably.

The invention provides an active lightning triggering device and method for a fan blade. The device comprises two copper rods with tip heads, a protection circuit, a boost lightning circuit and a metal shielding net. The two copper rods are arranged in parallel at the blade tip of the fan blade, one copper rod is directly grounded, and the other copper rod is connected with the boost lightning circuit through the protection circuit; the boost lightning guide circuit comprises a charging capacitor, an inductor, a high-frequency switch and a diode and is used for sensing positive high voltage and dynamically adjusting resonance characteristics so as to enhance voltage difference between thundercloud and a copper rod and trigger uplink and downlink leader to form a discharge channel; the metal shielding net wraps the blade tip and is connected with the grounding device to ensure that lightning current is preferentially discharged through the copper rod, and the blade tip structure is prevented from being damaged. According to the method, environmental meteorology and blade attitudes are monitored in real time, a boosted circuit is started in combination with threshold judgment, and control parameters are optimized by using a remote monitoring platform, so that intelligent lightning protection management is realized. According to the device, by actively exciting corona discharge and accurately guiding a lightning path, the lightning protection efficiency of the blade is remarkably improved, the damage risk of a non-lightning-receiving area is reduced, meanwhile, a maintenance decision is supported through datamation operation and maintenance, and the device is suitable for wind generating set protection in a thunderstorm area.

The invention provides a method for determining the self-discharge rate of a battery. The method comprises the following steps: determining an equivalent circuit model of the battery; based on the equivalent circuit model, establishing a function relationship between the change rate of the open-circuit voltage of the battery and time; determining an open-circuit voltage corresponding to each time point of the battery within the first preset duration; determining a fitting curve of the change rate of the open-circuit voltage and the time based on the time point in the first preset duration and the open-circuit voltage corresponding to the time point; and based on the fitted curve, determining a function relationship so as to determine the self-discharge rate of the battery. According to the method for determining the self-discharge rate of the battery, the self-discharge rate can be determined only in a minute level, while the self-discharge rate can be determined in a few weeks level in an existing differential pressure method, so that the self-discharge detection efficiency is improved to a great extent, meanwhile, the inventory proportion caused by detection is reduced, the inventory utilization rate is improved, and potential safety hazards caused by storage are reduced.

The utility model discloses a chip factory fresh air conditioning unit cold and hot coil pipe rapid dust removal and cleaning device which comprises an air switching device, a pressure difference sensor, an automatic control box, a power control box, a CDA compressed air pipeline and CDA compressed air nozzles evenly distributed on the surface of a fresh air conditioning unit cold and hot coil pipe. The gas switching device is connected with the CDA compressed air nozzle through the CDA compressed air pipeline, the pressure difference sensor feeds back the pressure difference of an inlet and an outlet of the coil pipe in real time, the automatic control box is connected with the pressure difference sensor and the gas switching device, and the power control box provides a low-voltage power source for the automatic control box. The device is used for removing dust on the air conditioning unit coil pipe, the speed is high, operation is convenient, and manpower is saved; the operation static pressure of the air conditioning unit is reduced, and the energy-saving effect is obvious; the device has sterilization and disinfection functions and does not corrode the surface of the coil pipe.

The invention discloses a low-voltage loop latent fault real-time monitoring device, which comprises a controller, a current acquisition module, a voltage difference acquisition module, a phase voltage acquisition module, a management machine and a background master station, and is characterized in that the controller is respectively connected with the current acquisition module, the voltage difference acquisition module, the phase voltage acquisition module and the management machine, and the management machine is also connected with the background master station; the controller is further connected with a debugging network port, a B code time synchronization module, a watchdog, a wave recording storage module, a constant value storage module and an external real-time clock, the abnormal loss of the power supply loop is calculated by monitoring the electrical analog quantity of the power supply loop at the start end and the tail end of the power supply branch loop, the abnormal loss is analyzed, the ratio of inter-phase voltage and other data are analyzed, and the real-time performance of the power supply loop is improved. And the abnormal heating problem of the whole power supply branch loop is judged by measuring the electric energy loss, and an alarm is given in advance, so that the latent fault abnormal problem of the low-voltage loop is early warned before a fault occurs.