400 results about "Voltage sensor" patented technology

The invention relates to the technical field of power equipment state monitoring, and particularly discloses a power cable operation state real-time evaluation system based on multi-mode deep learning, and the system comprises the steps: synchronously collecting the load, partial discharge and temperature strain data of a cable through a current and voltage sensor, an ultrahigh frequency sensor and a distributed optical fiber sensor; feature extraction and cross-dimension fusion are carried out on the multi-source data, and a multi-dimensional feature matrix is constructed; a pre-trained deep learning model is utilized to analyze internal association between the features, and cable health degree scores, fault risk levels and defect type identification results are output; automatically generating and executing a load adjustment, loop switching or precise maintenance strategy according to an evaluation result; according to the method, the problems of inaccurate evaluation and early warning lag caused by data isolation analysis of a traditional monitoring method are solved, and real-time accurate evaluation and intelligent closed-loop operation and maintenance of the operation state of the cable are realized.

The invention relates to the field of unmanned aerial vehicle motor service life prediction, and discloses an unmanned aerial vehicle motor service life test method, which comprises the following steps: collecting motor data in real time through temperature, vibration, current and voltage sensors, carrying out cleaning, denoising and standardization processing, analyzing motor characteristics by adopting physical modeling, extracting parameters such as damage rate, temperature and load, and calculating the service life of the unmanned aerial vehicle motor. According to the method, historical data and physical modeling features are combined, an LSTM deep learning model is constructed for time sequence training, the remaining service life RUL is predicted, feature fusion is carried out, the prediction precision is improved, the health state of the motor is evaluated according to a prediction result, maintenance suggestions are provided, the model is optimized and fed back, and the prediction method is dynamically adjusted. According to the technical scheme of fusing physical modeling and the deep learning LSTM network, high-precision prediction of the service life of the motor is realized, the intelligent degree of data processing is improved, and the adaptability of the model to a complex operation environment is enhanced.

The invention belongs to the technical field of battery management systems, and particularly relates to a battery state-of-charge estimation method for resisting a voltage sensor fault, which comprises the following steps: S1, data acquisition and system initialization; s2, state prediction; s3, measurement updating and online compensation are carried out; and S4, recursive circulation is carried out. According to the method, the direct-current bias quantity generated by a voltage sensor due to zero drift is widened into a state variable of a battery model, and the state variable, ohm internal resistance, polarization internal resistance, polarization voltage and charge state of a battery jointly form an expansion state vector; and performing real-time recursive estimation on the extended state vector by adopting an unscented Kalman filtering algorithm, and simultaneously obtaining an estimated value of the offset of the sensor and an estimated value of the SOC of the battery subjected to deviation compensation. Through combination of state extension and unscented Kalman filtering, fault bias of the voltage sensor can be identified and compensated online, non-Gaussian noise interference is effectively suppressed, and accuracy and robustness of battery SOC estimation in a complex industrial environment are remarkably improved.

The invention relates to an unmanned aerial vehicle zero-value insulator live detection device and method, an execution module comprises an AI image recognition unit and a detection probe, the detection probe integrates a voltage sensor and a resistance sensor and supports two modes of live resistance detection and distributed voltage detection, the AI image recognition unit is adjacent to the root of the detection probe, and the AI image recognition unit is adjacent to the root of the detection probe. The image acquisition module is used for acquiring insulator steel cap images and outputting positioning signals; the controller mainboard is electrically connected with the detection probe, the rotating mechanism and the AI image recognition unit through shielding cables, and the controller mainboard is used for receiving a positioning signal of the AI image recognition unit, receiving voltage detection data and / or current detection data transmitted by the detection probe, processing the detection data and obtaining a detection result of the state of the insulator. According to the invention, a dual-mode cooperation mechanism of'distributed voltage preliminary screening + charged resistance verification 'is adopted, and AI automatic positioning and mode automatic switching functions are combined, so that the detection efficiency is remarkably improved.

The invention discloses a differential non-intrusive voltage measurement method based on a charge simulation method, and relates to the technical field of voltage sensor measurement, and the method comprises the steps: obtaining the distance from a plurality of sensors to a simulation line charge; wherein every two sensors form a double-layer differential structure; the simulated line charge is located in the center of the wire; based on each double-layer differential structure, determining a corresponding field-source decoupling relational expression; based on an electromagnetic formula, obtaining a relational expression between the wire surface voltage and the simulated line charge in the single power transmission line model; determining a single line voltage inversion expression based on the field-source decoupling relational expression and the relational expression of the wire surface voltage and the simulated line charge in the single power transmission line model; determining the number of single-line voltage inversion equations based on the single-line voltage inversion expressions and the number of sensors; and based on a plurality of single-line voltage inversion equations, calculating to obtain a voltage solution with the minimum overall error. According to the invention, the overall anti-interference performance of voltage inversion can be improved.

The invention discloses a multimodal transport cargo transportation state monitoring system based on a standardized intelligent tray group. The system comprises a modular tray group composed of a main control tray and at least one functional tray; the main control tray is integrated with an edge calculator, an RFID reader-writer, a temperature and humidity sensor and a power supply module; the functional tray comprises a strain sensor and an acceleration sensor; the tray groups are rigidly connected through electromagnetic lock catches, and a voltage sensor is arranged to monitor the connection state; the tray group transmits data through a mixed communication channel; LoRa wireless communication is adopted by default, and magnetic attraction wired connection is switched when the packet loss rate is greater than 1%; after being preprocessed by the edge calculator, the data are encrypted by the Beidou system and uploaded to the background server; the background server executes overload and unbalanced load analysis, vibration grade evaluation, environmental risk early warning and lock catch state monitoring; and triggering a user side to give an alarm when an exception is detected. The safety monitoring problem of goods transportation is effectively solved, the transportation safety is improved, and the accident risk is reduced.

The invention discloses a fault monitoring and positioning method for a high-voltage drop-out fuse, and relates to the technical field of power equipment fault monitoring, and the method comprises the steps: obtaining original monitoring sequences corresponding to current and voltage sensors disposed at upper and lower ports of a target fuse; activating a working mode recognizer to execute working mode recognition of the target fuse, establishing a global mode label, executing adaptive matching of a mode fingerprint database, and establishing a standard comparison fingerprint with a trust identifier; establishing residual spectrum characteristics; and establishing a fault discrimination vector, carrying out space fault positioning by using the fault discrimination vector, and generating a fault positioning result. According to the invention, the technical problems of insufficient fault monitoring and positioning accuracy, lack of visual presentation capability and low monitoring and positioning efficiency of the high-voltage drop-out fuse in the prior art are solved, and accurate positioning and visual presentation of the fault of the high-voltage drop-out fuse are realized. And the accuracy and efficiency of fault monitoring and positioning are improved.

The invention relates to a visual on-load voltage regulation tap switch control system, device and medium, which comprises a single chip microcomputer control circuit, the single chip microcomputer control circuit is connected with a signal processing circuit and a power supply circuit, and the signal processing circuit is connected with a voltage zero cross detection circuit, a voltage sensor and a data acquisition unit. The voltage zero-cross detection circuit, the voltage sensor, the data acquisition unit and the power supply circuit are all connected with the isolation reduction transformer, and the isolation reduction transformer is connected with the low-voltage side voltage of the distribution transformer; the single-chip microcomputer control circuit is further connected with a switch position sensor, a communication circuit, a switch drive circuit and a thyristor trigger circuit. The communication circuit is in communication connection with a remote computer through an RS485. The method has the advantages of realizing automatic voltage regulation conversion, stabilizing voltage, accurately setting visual parameters and realizing non-impact voltage regulation.

The invention discloses a self-adaptive control method, system and device for inertia coefficients of a network-forming converter and a storage medium, and relates to the technical field of power electronic converter control, and the method comprises the steps: collecting the DC side voltage of a converter in real time through a voltage sensor, and calculating the deviation between the DC side voltage and a DC voltage reference value; the output angular velocity deviation of the converter is obtained, the inertia coefficient of the converter is dynamically adjusted through a nonlinear function in combination with the direct-current side voltage deviation, and self-adaptive adjustment of control parameters of the converter is achieved; the dynamically adjusted inertia coefficient of the converter is substituted into a converter control link in real time, and the output characteristic of the converter is changed, so that the output performance of the converter is optimized; self-synchronization grid connection can be realized, the anti-interference capability of the system is enhanced, the converter adapts to complex working conditions, virtual inertia is provided for a power grid, the frequency of the power grid is stabilized, and the operation stability of the grid-forming converter and the new energy accepting capability of the power grid are improved.

Electrical storage system with: an electrical storage device (10); a load (20); a line (PL) configured to connect the electrical storage device (10) and the load (20); a relay (SMR-G) that is provided in the line (PL); a capacitor (C11) which has one end connected to the electrical storage device (10) and the other end connected to a ground; a voltage sensor (21) configured to detect a voltage value of the capacitor (C11); a first insulation resistance (RB) which is set up between the electrical storage device (10) and the ground; a second insulation resistor (RL) which is installed between the load (20) and the ground; a first current path (L1) which includes the first insulation resistance (RB); a second current path (L2) comprising the conductor (PL) and the second insulation resistance (RL); and a control unit (50) that is configured to (a) Controlling ON and OFF of the relay (SMR-G), and (b) Determine that the relay (SMR-G) is blocked in an ON state if the voltage value is substantially equal to a second voltage value in a case where control to turn off the relay (SMR-G) is carried out, where a first resistance value is higher than a second resistance value, the second voltage value is higher than a first voltage value, the first resistance value is a resistance value of the first insulation resistance (RB), the second resistance value is a resistance value of the second insulation resistance (RL), the first voltage value is a voltage value when a discharge current of the electrical storage device (10) flows to the capacitor (C11) in the first current path (L1), the second voltage value is a voltage value when the discharge current of the electrical storage device (10) flows to the capacitor (C11) in the second current path (L2).

The invention discloses a transmission tower angle steel electromagnetic pulse fastening system, which belongs to the technical field of transmission tower angle steel fastening, and is characterized in that a track subsystem is rigidly connected with an operation table to realize movement and position adjustment in an operation environment; the charging control platform comprises a power supply device, a capacitor, an SCR power voltage regulator and voltage sensors, the power supply device is connected with the capacitor, and the voltage sensors are connected to the two ends of the capacitor; the charging control platform regulates and controls the charging process of the capacitor through the SCR power voltage regulator; the electromagnetic pulse generation subsystem is connected with the charging control platform, and the electromagnetic pulse generation subsystem is used for generating electromagnetic pulses to achieve fastening operation of angle steel of the power transmission tower; the monitoring feedback subsystem is used for monitoring the operation state of the transmission tower angle steel electromagnetic pulse fastening system in real time. The electromagnetic pulse technology is combined with the field of angle steel reinforcement, and the problems that existing electromagnetic pulse crimping equipment is inconvenient to move, depends on an external power supply, is inaccurate in charging control, and is difficult to monitor the running state in real time are solved.

The invention relates to the technical field of power electronics and battery management, and provides a mobile power adapter and a dynamic power distribution and safety monitoring method thereof. The method comprises the following steps: acquiring the connection state of an external power supply, if the external power supply is detected to be connected, entering an adapter mode, and supplying power to equipment by a lithium battery pack through a bidirectional DC-DC conversion circuit; in the adapter mode, load data of an equipment charging channel, a self battery charging channel and two independent output interfaces are monitored in real time through a power sensor, and the electric quantity of equipment, the electric quantity of a lithium battery pack and the power of an external power supply are obtained; running data of a lithium battery pack and an output interface are collected in real time through a built-in temperature sensor, a built-in voltage sensor and a built-in current sensor, and the risks of over-charging, over-discharging, short circuit and overheating are detected in real time in combination with an abnormal state recognition algorithm; periodically detecting the internal resistance of the lithium battery pack, judging the aging degree of the battery according to the change of the internal resistance, and dynamically reducing the charging current based on the aging degree of the battery.

A battery pack includes cells, a pressure contributing component contributing to a change in pressure in the battery pack, at least one pressure sensor configured to detect the pressure in the battery pack, and at least one voltage sensor configured to detect a voltage of the cells. A thermal chain determination method includes detecting the pressure in the battery pack, detecting the voltage of the cells, determining that the pressure in the battery pack is abnormal when an amount or rate of change is larger than a predetermined value, determining that the voltage of the cells is abnormal when an amount or rate of change in the detected voltage is larger than a predetermined value, or when an absolute value of the voltage of the cells is smaller than a predetermined value, and determining that a thermal chain occurs when both the pressure and the voltage are abnormal.

A battery system includes a battery pack including a plurality of battery cells, a voltage sensor that detects a voltage of each of the battery cells, a current sensor that detects a current flowing through each of the battery cells, a fan that cools the battery pack by feeding air to the battery pack, and a control device for controlling air volume of the fan so as to match a target air volume. The control device calculates internal resistance of each of the battery cells based on detection values of the voltage sensor and the current sensor. When the internal resistance of any one battery cell of the battery cells exceeds a threshold value, the control device increases the target air volume as compared with when the internal resistances of the battery cells are all lower than the threshold value.

The invention provides a unified electric control method and device for turning and shimmy damping of a front wheel of an airplane, and solves the technical problems of high complexity and poor adaptability. The device comprises a voltage sensor used for collecting a bus voltage value of a DC power supply loop of an inverter; the power switch device is used for controlling the switch-in and switch-out of the energy consumption resistor R1 in the power supply loop; the relay is used for controlling the on-off of a power supply loop between the direct-current power supply and the inverter; and the logic control module is used for responding to a control requirement, outputting a PWM signal according to a preset control strategy of the corresponding control mode and performing power supply loop control. A turning / shimmy damping unified electric control framework based on electric control is formed to be matched with a unified electric control strategy, a hydraulic shimmy damping device is simplified, and meanwhile the weight and cost of an undercarriage are reduced. Through control mode switching, a PWM technology is adopted to drive the front wheel to actively steer in a control state, and shimmy damping is provided in a non-control state.

According to certain embodiments, a switch cover comprises a panel with a hole, wherein the hole is configured to receive a rocker, wherein the rocker selectively controls an electrical connection between a first line and a second line; a voltage sensor disposed on the panel and configured to induce a current from an electrical field generated by electrical power transmitted over the electrical connection between the first line and the second line; and an antenna disposed on the panel and configured to transmit a radio signal in response to induction of the current in the voltage sensor.

The present application provides a discharge control method for a fuel cell system, the fuel cell system comprising: a stack having a positive electrode and a negative electrode; a current sensor for detecting a current output from the positive electrode; the voltage sensor is used for detecting the voltage between the positive electrode and the negative electrode; the discharging circuit comprises a discharging resistor, one end of the discharging circuit is connected with the positive electrode, and the other end of the discharging circuit is connected with the negative electrode; a temperature sensor for detecting the temperature of the discharge resistor; and a control unit receiving a current value from the current sensor, a voltage value from the voltage sensor, and a temperature value from the temperature sensor, in which the discharge control method includes: receiving an instruction to perform a discharge operation; judging whether the temperature value is greater than a first temperature threshold; under the condition that the temperature value is smaller than or equal to the first temperature threshold value, the discharging circuit is made to execute discharging operation; and when the voltage value is smaller than or equal to the preset voltage value, the discharging circuit stops discharging operation.

The invention discloses a charging optimization method and system in a cable electromagnetic pulse connector crimping technology, and belongs to the technical field of cable connector crimping. The method comprises the steps that a charging control system is started, and a power module is used for providing initial charging current for a capacitor; the voltage of the capacitor is monitored in real time through voltage sensors at the two ends of the capacitor, and voltage data is fed back to the charging control module; a current sensor in the charging loop is used for monitoring the charging current of the capacitor in real time, and current data is fed back to the charging control module; the charging control module adjusts the current and voltage of the power supply module according to the feedback of the voltage sensor and the current sensor, so that the capacitor is charged according to a set charging curve. According to the invention, the problems of inaccurate charging process control, lack of effective monitoring feedback, low charging efficiency and the like in the existing cable electromagnetic pulse joint crimping process are solved, so that the crimping quality is improved, the equipment damage is avoided, the production cost is reduced, and the stability and safety of power transmission are ensured.

The application provides an insulation state on-line monitoring device of a lightning arrester, and relates to the technical field of lightning arrester leakage monitoring.The device comprises a sensor module, at least including a voltage sensor and a current sensor, the voltage sensor obtains the voltage value on the lightning arrester through electric field coupling with the lightning arrester, and the current sensor is sleeved on the grounding wire of the lightning arrester and is used for collecting the current value leaked by the lightning arrester; a circuit protection module is connected in series with the current sensor; a data processing module is connected in communication with the voltage sensor and the current sensor respectively, is used for obtaining the insulation resistance value of the lightning arrester according to the voltage value and the current value, and determines the insulation state according to the insulation resistance value.The application can obtain the voltage value and the leaked current value of the lightning arrester by using a non-contact collection mode, reduces the influence of interference signals on the voltage value and the current value, and provides technical support for obtaining the accurate insulation state of the lightning arrester.

This invention discloses a battery self-heating and power compensation system and method for electric mining trucks used in high-altitude and cold mining areas. The system includes: a battery system comprising a battery pack consisting of multiple battery modules, each battery module integrating a temperature sensor and a voltage sensor; a high-frequency pulse self-heating module; a power compensation energy storage unit; an integrated thermal management unit including a liquid cooling plate, a heating film, an insulation layer, and a heat pump air conditioning system; a working condition sensing and prediction unit for real-time acquisition of vehicle working conditions, ambient temperature, and battery status; and a collaborative controller. This invention ensures normal vehicle startup; provides instantaneous high-power compensation capability to meet the power demands of mining trucks under heavy-load climbing, acceleration, and other conditions, compensating for low-temperature battery power decay; achieves safe and fast charging at low temperatures, avoiding lithium dendrite growth and improving charging efficiency; reduces thermal management energy consumption and improves overall vehicle energy utilization; extends battery life at low temperatures; and improves system reliability.

The application provides a kind of digital non-contact AC voltage sensor and voltage measurement method, sensor includes open type AC voltage probe, and the sensing component in the inside of probe is based on the principle of capacitive voltage division, and the high voltage on the wire is converted into the first voltage analog signal, and the interference protection is provided by the external ground shielding layer.Signal output by probe is sent to signal acquisition module, and the signal conditioning circuit in the module first carries out filtering, direct current isolation and amplification to signal, generates the second voltage analog signal more easily handled.Subsequently, the main control unit integrated with analog-digital converter converts the signal into digital sampling value, and finally the measurement result is output in the form of digital signal by communication unit.The sensor realizes safe, convenient AC high voltage detection through non-contact measurement and full digital processing, and can output stable, anti-interference digital signal.

The invention discloses a non-contact voltage high-precision inversion optimization algorithm, and belongs to the technical field of distribution network voltage measurement, and the algorithm comprises the following steps: designing a non-contact voltage sensor probe of a double-coupling mechanism based on a displacement current method, obtaining the voltage of a to-be-measured line through measuring the value of displacement current, and obtaining the voltage of the to-be-measured line based on the voltage sensor probe. The method comprises the following steps: acquiring response voltage signals in different periods through an MOSFET gating measurement loop, establishing a voltage measurement model considering frequency deviation of a power system, and correcting phase angle deviation caused by frequency deviation and estimating voltage by adding a response equation and a Newton iteration algorithm; the method can optimize the performance of the sensor probe, and has the advantages of prominent deployment safety and convenience, high environment and system adaptability, remarkably improved measurement precision, efficient and reliable algorithm and the like.

The invention discloses a modular multilevel matrix converter layered architecture device and a control method thereof. The invention discloses a layered architecture device. Comprising a three-phase AC input system, a bridge arm circuit, a three-phase AC output system, a DSP controller circuit, an FPGA controller circuit, an isolation driving circuit, a protection circuit, a starting circuit, an input voltage and current sampling circuit, an output voltage and current sampling circuit, a bridge arm voltage sampling circuit, a bridge arm current sampling circuit, a sampling signal conditioning circuit and an observer. According to the invention, the observation of the capacitor voltage of the M3C bridge arm sub-module is realized by using the observer, the number of voltage sensors and sampling circuits is reduced, the reliability of the system is improved, and the hardware cost is reduced; the hierarchical control method enables the control program to be easy to modify, update and transplant, reduces the workload of developers, and improves the control real-time performance.

A vehicle includes a battery pack configured to be charged with charging power which is DC power from a charger, a voltage sensor that detects a charging voltage of charging power, a switching device configured to switch between charging schemes different in charging voltage, and a vehicle controller that determines a charging scheme. The vehicle controller obtains from the voltage sensor, an insulation diagnosis voltage applied by the charger and determines the charging scheme based on the insulation diagnosis voltage.

The invention discloses an LED lighting electricity consumption abnormity monitoring method and system based on the Internet of Things, and relates to the technical field of intelligent lighting and energy-saving control. The system comprises a power utilization detection terminal, a wireless communication module, a data management platform, a front-end display terminal and an early warning module, and the power utilization detection terminal integrates a current sensor, a voltage sensor, an illuminance sensor and a control module and is used for collecting real-time power utilization information and environmental parameters of LED lighting equipment; the wireless communication module is used for uploading the collected data to a remote server; the data management platform analyzes the collected data, compares the data with an energy-saving threshold value set by the system, and judges whether an abnormal power consumption condition exists or not; the early warning module sends alarm information through instant messaging means such as a nailing interface, and assists operation and maintenance personnel in positioning abnormal equipment in time and taking energy-saving optimization measures. The system has the characteristics of energy conservation, high efficiency, intelligent monitoring and timely early warning, and is suitable for various indoor and outdoor LED illumination application scenes.

This invention provides a switch fault diagnosis technology for an energy storage device that includes a current circuit breaker composed of multiple semiconductor switches connected in parallel. [Solution] The energy storage device comprises a battery pack having a positive electrode, a positive electrode external terminal 11, a discharge circuit breaker 13A included in a current interruption unit 30, a control unit, and a voltage sensor. The discharge circuit breaker 13A has a plurality of N-channel type MOSFETs 35A, a discharge interruption gate drive circuit 34A connected to the source terminal of each N-channel type MOSFET 35A, and a P-channel type MOSFET 36A provided between the discharge interruption gate drive circuit 34A and the gate terminal of each N-channel type MOSFET 35A. The control unit is connected to the discharge interruption gate drive circuit 34A and the gate terminal of each P-channel type MOSFET 36A. The voltage sensor measures the common-source voltage or common-drain voltage of the N-channel type MOSFET 35A.

The utility model relates to the technical field of battery test cabinets, and discloses a multi-station battery test cabinet which comprises a cabinet body, a current sensor is fixedly connected in the cabinet body, a voltage sensor is fixedly connected in the cabinet body, a sealing assembly is arranged in the cabinet body, the sealing assembly comprises a test board, and the test board is arranged on the test board. The plurality of test benches are slidably connected to the interior of the cabinet body, the side wall of each test bench is fixedly connected with a fixing piece, the side wall of the cabinet body is fixedly connected with a plurality of connecting pieces, and the interior of each connecting piece is fixedly connected with a clamping plate. According to the utility model, after being stressed, the sliding shaft drives the limiting plate at one end of the sliding shaft to slide in the fixing piece, finally, the fixing piece can slide out of the side wall of the connecting piece, and can be quickly reset and fixed through the elastic potential energy of the spring I, so that the time cost of equipment use is reduced, the overall test efficiency is improved, and especially in a high-frequency operation environment, the test efficiency is improved. And the time can be obviously saved.

The utility model belongs to the technical field of fireproof monitoring devices, and particularly relates to a titanium metal fireproof monitoring device based on a wireless network, which comprises an explosion-proof shell seat, an explosion-proof shell is in threaded connection with the explosion-proof shell seat, a double-layer mounting plate is arranged in the middle of the explosion-proof shell seat, and a circuit assembly is mounted on the upper layer of the double-layer mounting plate. A temperature sensor probe and a smoke sensor probe are mounted on the lower layer of the double-layer mounting plate, the circuit assembly comprises a circuit board and a storage battery which are mounted on the upper layer of the double-layer mounting plate, and a control chip and a battery charging adapter are arranged on the circuit board; four circular through holes are formed in the middle of the explosion-proof shell seat and are respectively positioned in the side parts of the double-layer mounting plate; a first voltage sensor and a second voltage sensor are arranged on the circuit board, the first voltage sensor is used for measuring the voltage of the total power line, and the second voltage sensor is used for measuring the voltage of the storage battery. According to the utility model, automatic charging can be carried out when the storage battery built in the fireproof monitoring device is under-voltage.

The invention discloses an intelligent verification device of a financial data center. The intelligent verification device is connected with the financial data center machine room refrigeration system; the intelligent verification device comprises a dynamic load simulation unit, a first temperature sensor, a second temperature sensor, a first voltage sensor, a first current sensor and a controller. The first temperature sensor is used for acquiring air inlet temperature information; the second temperature sensor is used for acquiring air outlet temperature information; the first voltage sensor is used for acquiring output voltage information of the dynamic load simulation unit; the first current sensor is used for acquiring output current information of the dynamic load simulation unit; and the controller is used for controlling the output power change of the dynamic load simulation unit, and determining the verification result of the machine room refrigeration system according to the obtained air inlet temperature information, air outlet temperature information, output voltage information and output current information. The output power of the dynamic load simulation unit is set to simulate a real scene, and the verification result accuracy of the machine room refrigeration system is improved.

The present application relates to the technical field of battery, and aims to provide a circuit for realizing active balancing of a battery pack and a battery pack balancing method.The circuit comprises a battery pack, an equalization channel circuit, an inductor, an equalization conversion circuit, a voltage sensor and a current sensor; wherein the battery pack is composed of N battery monomers in series; the equalization channel circuit comprises N+1 independent channel circuits composed of two back-to-back switching tubes, and the equalization conversion circuit comprises four independent conversion paths composed of two back-to-back switching tubes; the voltage sensor is shared by N, and is connected in parallel across two ends of each battery monomer; and the current sensor is connected in series at any one end of the inductor.The present application greatly simplifies the active balancing circuit, can effectively reduce the number of switching tubes, and accordingly reduce the number of switching tube driving circuits, thereby reducing the circuit cost; can realize various battery grouping and battery balancing modes, and has flexible balancing process and fast balancing speed.