149 results about "Dc control" patented technology

The Electric Vehicle Supply Equipment (EVSE) described herein is designed for Vehicle-to-Load (V2L) power transfer, enabling the delivery of electrical power from an electric vehicle to an external electrical load. The EVSE includes an output connector for connecting to a vehicle connector via an output cord, an electronic controller, and a power supply. The power supply is capable of receiving a direct current (DC) control pilot signal transmitted through the vehicle connector via the output connector and supplying DC electrical power to the electronic controller based on the received control pilot signal. This innovative EVSE system facilitates efficient and controlled power transfer between electric vehicles and external loads, enhancing the versatility and functionality of electric vehicle charging infrastructure.

This invention discloses a method and system for extracting and associating physical and logical circuits in a DC control and protection system. The method includes: constructing physical circuits based on engineering design drawings and optical cable documents; parsing the graphical program of the DC control and protection device to extract communication-related symbol information and constructing logical circuits; and representing the circuit data using a directed graph to associate the physical and logical circuits. This invention can efficiently realize the automatic construction and association of communication circuits, improving the efficiency of communication circuit diagnosis, debugging, and operation and maintenance in ultra-high voltage DC control and protection systems.

The invention relates to the technical field of power control, in particular to an active regulation space quantitative evaluation method considering active voltage coupling influence, and the method comprises the steps: firstly constructing a steady-state power flow equation containing DC control characteristics, correcting a Jacobian matrix through introducing a commutation bus power correction, and building a voltage active sensitivity index; probabilistic load flow calculation is carried out in combination with a new energy output probability model, and a voltage weak node is accurately identified by using an impedance mode margin index; and generating a PV curve by adopting a continuous power flow method, superposing a static voltage safety constraint condition, and performing intersection operation on a unit output interval and a reserve capacity interval in a safe operation range to obtain an effective active power regulation space, thereby accurately quantifying the actual regulation capability on the premise of ensuring the voltage safety, and further realizing high-precision voltage regulation. And the safety and the economical efficiency of system operation are effectively improved.

The utility model discloses an external fast charging control device for an electric automobile, which comprises an MCU (Microprogrammed Control Unit) control module, a sensor module electrically connected with the MCU control module, an AC (Alternating Current) slow charging protocol control module, a first CAN (Controller Area Network) transceiver, a second CAN transceiver, a first relay group electrically connected between the first CAN transceiver and a vehicle-mounted OBC (On Board Controller), and a second relay group electrically connected between the second CAN transceiver and the vehicle-mounted OBC, the second relay set is electrically connected between a vehicle-mounted OBC and the alternating current slow charging protocol control module, the third relay set is electrically connected between an OBC terminal of the vehicle-mounted OBC and the second CAN transceiver, and the large-voltage cable is electrically connected between a charging gun and a motor controller. The AC / DC quick charging controller is arranged between the vehicle-mounted OBC and the quick charging adapter, so that the quick charging problem of only configuring a slow charging vehicle is solved, the vehicle charging process information is controlled through the AC / DC controller, the charging information is displayed on the vehicle display screen, an original vehicle-mounted charging display interface can be simulated, and the user experience is better.

The invention relates to a vehicle-mounted safety output circuit, which comprises a negative voltage power supply sub-circuit, a DC control input sub-circuit, a pulse input sub-circuit, an intermediate sub-circuit, an output sub-circuit, a grounding end, a VCC power supply and a load, and is characterized in that the pulse input sub-circuit is connected with the negative voltage power supply sub-circuit, and the negative voltage power supply sub-circuit and the DC control input sub-circuit are connected with the intermediate sub-circuit; the negative voltage power supply sub-circuit is connected with the DC control input sub-circuit, the middle sub-circuit is connected with the output sub-circuit, the VCC power supply is respectively connected with the middle sub-circuit and the output sub-circuit, the load is connected with the output sub-circuit, and the grounding end is respectively connected with the negative voltage power supply sub-circuit, the middle sub-circuit and the output sub-circuit. The DC control input sub-circuit and the pulse input sub-circuit are used as input, and the final output can be effective only when the low-level output of the DC control input sub-circuit and the 100KHz and 110KHz alternating pulses of the pulse input sub-circuit are ensured to be effective at the same time, so that the safety is ensured.

The invention discloses a superconducting microwave resonant cavity, a band elimination filter and a frequency control method, and relates to the technical field of superconducting microwave resonant cavities. The superconducting microwave resonant cavity comprises a thin film layer, a first superconducting electrode, a second superconducting electrode, a third superconducting electrode, a first port and a second port. The first superconducting electrode is arranged on the first surface of the thin film layer; the second superconducting electrode is arranged on one side of the second surface of the thin film layer, a gap exists between the second superconducting electrode and the second surface, and the first end of the second superconducting electrode is connected with the first end of the first superconducting electrode; the third superconducting electrode is arranged on the first surface; the first port is coupled with the first end of the first superconducting electrode and is coupled with the first end of the second superconducting electrode, and the first port receives an external input signal and outputs a target signal; and the second port is connected with the third superconducting electrode and receives an external direct current control signal. The resonant frequency of the microwave resonant cavity is adjustable.

The invention relates to an off-line function verification system and method for a logic control board of an electric actuating mechanism. According to the system, a man-machine interaction module receives a function test scheme and sends the function test scheme to a host control module; the host control module instructs the direct current control module to output a direct current voltage signal to the logic control board to be tested through the output module according to the function test scheme; according to the function test scheme, the host control module controls the instruction simulation module to output valve control simulation signals corresponding to the valve control signal simulation instructions to the logic control board through the output module; the host control module controls the operation monitoring simulation module to output an operation monitoring simulation signal to the logic control board through the output module; and the host control module receives and verifies whether the first interface feedback information and the second interface feedback information meet function verification requirements in the function test scheme, and obtains an offline function verification result of the logic control board. The system is beneficial to improving the function verification accuracy of the logic control board.

The utility model relates to a nuclear power plant switch test device, which comprises a box body, an operation panel is arranged in the box body, the nuclear power plant switch test device further comprises a main power supply switch, a power supply switch and a power supply switch, the high-voltage power supply unit is electrically connected with the output end of the main power switch and is used for selectively providing a working power supply for the tested switch equipment; the plurality of direct current control power supply units are electrically connected with the output end of the main power switch and are used for outputting different power voltages; the plurality of control units are arranged on the operation panel, are electrically connected with the plurality of direct current control power supply units in a one-to-one correspondence manner, and are used for being electrically connected with the tested switch equipment through a cable so as to control the switch-off or switch-on of the tested switch equipment; and the indication unit is arranged on the operation panel, is electrically connected with one direct-current control power supply unit, and is used for being electrically connected with the tested switch equipment through a cable so as to display the feedback state of the tested switch equipment. According to the utility model, the test efficiency of the switchgear can be improved.

The application provides a converter valve area short-circuit fault positioning method, device, equipment and medium, the method comprises the following steps: dividing the converter valve fault into eight typical valve area short-circuit faults; RTDS simulation analysis, according to the different converter protection action results, dividing into three types of protection actions, giving the typical fault characteristic quantity of the valve difference protection action for positioning the valve area fault and the eight typical valve area short-circuit quick criterion; according to whether the actual converter protection action occurs in the rectifying station or the inverting station, confirming the valve area short-circuit fault occurring station; according to the converter protection action event of the monitoring background, confirming the converter protection action type and the valve area fault converter bridge; calling the built-in fault recording of the DC control protection, analyzing the converter protection action waveform, analyzing the fault characteristics of the current waveform of the valve side of the converter bridge and the outlet current waveform of the DC side, positioning the valve area short-circuit fault point according to the typical fault characteristic quantity of the valve difference protection action and the eight typical valve area short-circuit quick criterion; and has the advantages of fast positioning speed and simple analysis method.

The invention provides a communication unit and a control method thereof, a power converter and a power conversion system, and relates to the technical field of power electronics, and the communication unit comprises a plurality of magnetic rings, a power line communication unit, and a plurality of channel selection switches. A cable on the input side of each DC conversion circuit is provided with at least one magnetic ring; the signal end of the magnetic ring is connected with the signal end of the power line communication unit through at least one channel selection switch; the communication unit is used for switching on the channel selection switch corresponding to the first direct current conversion circuit and switching off the channel selection switch corresponding to the second direct current conversion circuit; the power line communication unit is controlled to send a device search signal, so that the direct current control device receiving the device search signal feeds back a response signal; and receiving the response signal, and taking the direct current control equipment corresponding to the received response signal as the direct current control equipment in the direct current string connected with the first direct current conversion circuit. The identification efficiency of the direct-current conversion circuit connected with the direct-current control equipment can be improved.

The invention relates to an off-line function verification system and method for a power module of an electric actuating mechanism. According to the system, a man-machine interaction module receives function test information input by a user and sends the function test information to a host control module; the host control module respectively sends an AC voltage control instruction and a DC voltage control instruction to the AC control module and the DC control module according to the function test information, and controls the AC control module and the DC control module to output an AC voltage signal and a DC voltage signal to the output module; the output module outputs the signal to the power supply module of the to-be-tested electric actuating mechanism; the function detection module collects direct current voltage data corresponding to different interfaces of the power supply module and sends the direct current voltage data to the host control module. And the host control module verifies whether the direct-current voltage data meet the function verification requirements in the function test information to obtain a function verification result of the power supply module. The method is beneficial to improving the function verification efficiency of the power module of the electric actuating mechanism.

The invention belongs to the technical field of high-voltage direct-current control systems, and discloses a high-voltage direct-current control system direct-current measurement equipment reliability improving method which comprises the following steps: S1, replacing a laser energy supply board card of an electronic transformer with a screened board card of the same type; s2, connecting a direct current control host to a redundant merging unit of the action cabinet to form two paths of measurement channels; the method has the following beneficial effects: 1, the laser energy supply board card of the electronic transformer is replaced, the quality of the laser energy supply board card of the electronic transformer is improved from the aspect of hardware, and the equipment failure rate is reduced; 2, the DC control host is provided with two measurement channels, the accuracy of measurement information is ensured, and a slight alarm is given out when one channel is abnormal, so that single-system operation of the DC control host can be avoided; and 3, a measuring channel maintenance soft pressing plate is arranged, so that fault checking and processing of the merging unit laser board card can be facilitated, and exiting of a direct current control host can be avoided.

The invention discloses a dual-mode phase shifter based on artificial surface plasmon. The dual-mode phase shifter comprises a dual-mode transmission structure, a dual-mode excitation structure and a direct current control structure, the dual-mode transmission structure realizes simultaneous transmission of an even mode and an odd mode in a single physical channel; the dual-mode excitation structure ensures efficient excitation of an even mode and an odd mode, the even mode is directly excited by a microstrip port, and the odd mode is indirectly excited by a microstrip-slot line coupling mode; the DC control structure realizes real-time control of two modes of the dual-mode transmission structure. According to the invention, simultaneous transmission of an even mode and an odd mode under the same frequency and a single physical channel is realized, and independent control of phase electromagnetic characteristics of the two modes is realized according to the control method after introduction of semiconductor devices such as a variable capacitance diode, so that independent phase shift of two paths of signals under the same frequency is realized simultaneously, and the signal transmission efficiency is improved. And the phase shift ranges of the two paths of signals both cover 360 degrees.

The present application relates to the technical field of control cabinet, disclose a kind of double power supply false switching mechanism's dc MCC control cabinet with preventing, including cabinet, power switch A and power switch B are respectively fixedly connected in cabinet, power switch A and power switch B are all rotatably connected with latch handle, limit hole is all set up on the latch handle, two hollow connecting rods are located in the limit hole of power switch A and power switch B in same side, slidingly connected with support block in the communicating port of hollow connecting rod, support block is close to the side in hollow connecting rod and is all fixedly connected with inclined guide plate, the inner wall of hollow connecting rod is fixedly connected with limit spring close to one end of mounting base, one end of limit spring is fixedly connected with guide seat, guide groove is set up on the guide seat, and the number and position are all corresponding with each guide plate, this double power supply false switching mechanism's dc MCC control cabinet with preventing, avoid the problem that hollow connecting rod movement stroke is consumed and cannot drive latch handle to complete closing action in time due to the wear and tear of connecting portion.

The invention relates to a mechanical electric actuating mechanism function verification system and method. The system is characterized in that a man-machine interaction module receives input function test information and sends the information to a host control module; the host control module controls the alternating current control module and the direct current control module to output an alternating current voltage signal and a direct current voltage signal to the electric actuating mechanism through the interface module according to the function test information; the host control module controls the function measurement module to respectively acquire operation current measurement data, operation duration measurement data, direct current resistance measurement data and insulation resistance measurement data of the electric actuating mechanism based on an on-off feedback signal of the limit switch fed back by the interface module; whether the operation current measurement data, the operation duration measurement data, the direct current resistance measurement data and the insulation resistance measurement data meet the function verification requirements in the function test information or not is verified, and a function verification result of the electric actuating mechanism is obtained. The method is beneficial to improving the accuracy of function verification of the electric actuating mechanism.

According to the MMC flexible direct-current control method and system for suppressing short-circuit current and supporting voltage, when an alternating-current system fault is detected, an outer-loop controller adopts a self-adaptive current limiting control strategy, and a current reference value, not larger than a safety threshold value, of an inner-loop controller is generated according to the voltage drop depth and direct-current voltage deviation; when it is detected that the fault of the alternating current system is eliminated, the outer loop controller generates a current reference value of the inner loop controller based on constant alternating current voltage control or maximum reactive current output control by adopting a dynamic reactive enhanced support strategy; establishing a predictive controller in the inner loop controller based on a model predictive control method; the prediction controller selects a target function based on a strategy adopted by the outer loop controller according to the current state of the system, and outputs an optimal voltage vector sequence enabling the target function to be minimum; based on the optimal voltage vector sequence, the inner loop controller generates a modulation signal; and the overall safety and stability of the AC / DC hybrid power grid containing the MMC are improved.

The invention relates to an auxiliary control system-based AC / DC power supply system station end equipment management method and system, which relates to the field of data processing, and processes an AC control mode, a DC control mode and environmental parameters from an AC / DC power supply system station end and equipment service time through an equipment state simulator bound with preset bit number equipment. Obtaining an equipment state confidence interval; receiving equipment state monitoring time sequence information, and comparing the equipment state monitoring time sequence information with the equipment state confidence interval to obtain a deviation vector time sequence matrix; and based on a historical sample library, counting a trigger period concentrated value of a fault sample set of the preset bit number equipment model satisfying the deviation vector time sequence matrix, and performing monitoring period management on the preset bit number equipment, thereby solving the problem that accurate monitoring and management cannot be performed according to the differential characteristics of the AC / DC power supply system station end equipment. And the accuracy and the efficiency of equipment health management are not enough.

The invention discloses a mining dual-power-supply automatic switching illumination comprehensive protection system, and belongs to the technical field of mining electrical protection equipment. The technical scheme of the invention comprises a power supply input circuit, a vacuum contactor and a programmable logic controller used for monitoring a power supply state in real time and executing switching logic. The core of the system is that a buffer module is arranged in a direct current control power supply circuit for supplying power to the PLC and the control relay in parallel. During normal power supply, the buffer module is charged for energy storage; when a main power supply breaks down and a system executes switching, in a short interval when the main vacuum contactor and the auxiliary vacuum contactor are disconnected, the buffer module discharges immediately to provide an uninterrupted direct-current power supply for the PLC and a control loop, so that the PLC can continuously and stably execute a switching instruction, seamless power supply switching of a lighting load is realized, and the power supply reliability of the lighting load is improved. The lighting blind area in the switching process is eliminated, and the safety of underground operation is remarkably improved.

The application discloses a kind of distributed energy and load intelligent management and control system based on wisdom family, including energy router host control unit, mains access module, family photovoltaic interface module, direct current energy storage interface module, new energy automobile charging interface module and household electricity interface module.Mains, photovoltaic, new energy automobile charging and household electricity interface module are connected with host control unit through direct current control type solid state relay.Direct current energy storage interface module is connected with host control unit through overcharge relay control circuit containing opto-coupler isolation device and switching triode, and integrates hardware level undervoltage protection circuit, provides double security guarantee of software and hardware.The host control unit of the application executes intelligent scheduling logic, according to illumination, energy storage battery capacity, power grid state and other information, preferentially allocates photovoltaic power supply, coordinates energy storage charging and discharging and power grid energy supplement, and guarantees core load power supply when power grid is powered off.

The invention discloses a high-voltage motor starting limiting and fault locking protection circuit which comprises a control bus, a high-voltage vacuum circuit breaker, an operation column, a motor comprehensive protection device and a combined relay KTA. The combined relay KTA is composed of a power-off delay relay and an intermediate relay, and pins 1 and 2 of the combined relay KTA are connected in series with a normally open auxiliary contact of the high-voltage vacuum circuit breaker and then connected between the positive electrode and the negative electrode of the control bus; a pin 3 is connected with a pin 5, and a pin 4 is connected with an external protection interlocking action inlet of the motor comprehensive protection device; a pin 5 is connected with a common point of a tripping outlet of the motor comprehensive protection device and an opening button of the operation column, and a pin 6 is connected with a negative electrode of the direct current control bus; the pin 7 is connected in series into a closing loop, and the pin 8 is connected with the front end of a closing coil of the high-voltage vacuum circuit breaker. Wiring is simple, and operation is convenient.

A direct-current control circuit integrated with an ignition function relates to the technical field of generator control, a high-voltage pack of an igniter is directly integrated on an engine, the igniter is directly driven by electric energy generated by a generator by improving the control circuit, an ignition winding in the generator is removed, and the power generation efficiency of the generator is improved. The production cost of the generator is reduced; comprising a generator and an engine, a high-voltage pack is integrated on the engine, the output end of the engine is connected with the input end of the generator, the output end of the generator is connected with a rectifier bridge unit, and the output end of the rectifier bridge unit is connected with an isolation voltage division unit. The isolation voltage division unit is used for carrying out voltage reduction and voltage division output on the direct current output by the rectifier bridge unit, the isolation voltage division unit comprises at least one output end, one output end of the isolation voltage division unit is electrically connected with the ignition circuit unit, and the output end of the ignition circuit unit is electrically connected with the high-voltage pack.

The invention provides an energy storage DC-DC control module structure device, and relates to the technical field of energy storage equipment, the energy storage DC-DC control module structure device comprises a module shell, the left side and the right side of the module shell are both provided with fixing supports, the left side of the module shell is provided with a first connector, the right side of the module shell is provided with a second connector, and the module shell is provided with a module upper cover. A sealing ring and a module PCBA are arranged in the module shell, the module shell is made of a high-strength alloy material, an installation groove matched with the installation of the module PCBA is formed in the module shell, a limiting structure is arranged on the wall of the groove, and the fixing support is assembled in the module shell. The space occupation and the carrying cost of the energy storage equipment are greatly reduced, the device is not only suitable for a fixed energy storage power station, but also can be flexibly applied to mobile energy storage scenes such as a portable energy storage power supply, a mobile charging station and a vehicle-mounted energy storage system, and the market application range of the product is effectively expanded.

The invention provides a dynamic response method adopting automobile intelligent windshield wiper direct current control, which comprises the following steps: generating initial curved surface feature distribution information by analyzing curved surface area friction force and key point resistance distribution, and analyzing a swing angle change rate and contact surface pressure distribution in combination with a real-time position calibration value; obtaining detailed resistance distribution data of each key point; calculating a swing force balance value and a regional resistance compensation value, and determining a forward trajectory correction value and a reverse trajectory adjustment value; a dynamic motion track parameter is generated by combining the speed optimization weight ratio, the track parameter updating rate is updated, and adjusted windshield wiper arm motion control data is obtained; the windshield wiper arm is driven to execute the dynamic track, and if the pressure distribution deviates from a preset threshold value, the swing force balance value is finely adjusted; and analyzing the action of the friction force of the curved surface region on the long-term operation stability, and judging whether the track parameter update rate meets the adaptive requirement or not by combining the region resistance compensation value to obtain a final long-term parameter adjustment range.

The utility model discloses a dynamic difference loading circuit, which relates to the technical field of direct current control circuits and comprises a digital-to-analog conversion circuit, a comparison circuit, a starting circuit and a metal oxide semiconductor (MOS) tube control circuit, one end of the digital-to-analog conversion circuit is connected with the comparison circuit, one end of the comparison circuit is connected with the starting circuit, and one end of the starting circuit is connected with the MOS tube control circuit. According to the utility model, the structure is scientific and novel, the digital-to-analog conversion circuit, the comparison circuit, the starting circuit and the MOS tube control circuit are utilized, the current firstly flows through the comparison circuit, the starting circuit controls the starting and stopping of an instrument, the MOS tube control circuit controls the actual flowing value of the current after starting, and finally the current returns to the comparison circuit to form continuously-controlled dynamic balance, so that the dynamic balance is realized. And the on-off degree of the MOS tube is controlled by amplifying the voltage difference through the comparison circuit, so that the MOS tube is always in a dynamic working state, thereby ensuring that the load pulling current is maintained in a dynamic balance state.

The utility model discloses an outdoor scenery and firewood and energy storage integrated machine, including cabinet, mixed inverter, DC control box and energy storage battery, and mixed inverter, DC control box and energy storage battery all are located in the inside of cabinet and are in close proximity between adjacent, and the liquid cooling assembly that is used for giving energy storage battery heat dissipation is established in the cabinet and is in close proximity energy storage battery below, and the panel of cabinet is close to the adjacent component, and the front and rear panel that is close to mixed inverter all are set up and are used for the first mesh hole of mixed inverter ventilation and heat dissipation. The utility model discloses mixed inverter, DC control box and energy storage battery are in close proximity mode and are located in the inside of cabinet, and set up liquid cooling assembly and give energy storage battery heat dissipation, and the first mesh hole that is used for giving mixed inverter ventilation and heat dissipation is set up on the front and rear panel, so that each component can be set more compact, and the panel of cabinet can be set close to the adjacent component, let the volume of whole cabinet be smaller, and the land occupation is also small, and the installation of convenient handling.

The utility model relates to the technical field of welding machines, in particular to an automatic polarity-changing five-in-one welding machine, which is characterized in that a bridge rectifier unit is used for converting alternating current into direct current, and a PFC (Power Factor Correction) unit is used for providing a stable direct current power supply with a high power factor for a subsequent circuit; the full-bridge inversion unit is used for converting the direct current output by the PFC power factor correction unit into square wave alternating current; after a panel selection signal is processed by the single chip microcomputer, an AC / DC control signal is output, the AC / DC control signal controls a relay J1A to act through a triode T50, and the machine can achieve three welding modes of DC-MMA, DC-TIG and MIG through panel selection. When alternating current is output, the two welding modes of AC-MMA and AC-TIG are achieved through panel selection, so that the defect of a single welding mode of a previous welding machine is overcome, and the requirements of various occasions are met.

This invention discloses a method for identifying abnormal insulation aging in DC control cables, relating to the field of power secondary system operation and intelligent maintenance technology. The method includes: using a non-invasive current sensor to acquire leakage current-related data of multiple target circuits and determine their respective insulation status parameters under conditions of no power outage and no line interruption; collecting the parameters of multiple circuits and determining a dynamic baseline characterizing the overall level of the group through robust statistical analysis; comparing the parameters of each circuit with the dynamic baseline to identify suspicious states; and determining that the circuit has abnormal insulation aging and issuing an early warning when the persistence of a suspicious state meets preset conditions. This application achieves high sensitivity and high reliability in early warning of insulation degradation by constructing a dynamic baseline that changes synchronously with the environment to suppress common-mode interference and combining it with persistence confirmation logic.

The invention discloses an energy consumption device control method and system suitable for symmetric monopole-bipolar direct current, which are applied to the technical field of direct current control, and the method comprises the steps: obtaining the electrical quantity data of a target direct current system; performing abrupt change analysis on the electrical quantity data, and determining a fault event signal based on an obtained analysis result; based on the fault event signal, determining an energy consumption branch input by the target direct current system; a corresponding energy consumption branch is reconstructed, a reconstruction result is executed, and the voltage of the direct-current bus, the current of the sound pole converter and the temperature of the energy consumption resistor are obtained; processing by utilizing a multivariable decoupling control technology to obtain energy consumption power difference data; and based on the energy consumption power difference data, a cooperative control strategy is generated by adjusting an offshore wind plant in the target direct current system. According to the method provided by the invention, the technical problem that the transient stability of the system is influenced due to control target conflict caused by the fact that the independent action of the traditional energy consumption device is not deeply coordinated with other control structures of the direct current system can be solved.

The invention discloses an energy-saving circuit of a plasma power supply cabinet, and relates to the technical field of energy conservation, the energy-saving circuit of the plasma power supply cabinet comprises a PLC controller, a main loop unit and a cooling fan unit, the PLC controller is connected with the main loop unit, the main loop unit is connected to a direct current controller D21 through a main contact of an alternating current contactor KM1, and the cooling fan unit is connected with the direct current controller D21 through a main contact of the alternating current contactor KM1. One end of an in-cabinet cooling fan MF1 of the cooling fan unit is connected to a unit UPS power supply through an auxiliary contact of an alternating current contactor KM1 and a circuit breaker QF3, the main loop unit performs on-off control through a main contact of the alternating current contactor KM1, and the cooling fan unit is connected in series with the in-cabinet cooling fan through the auxiliary contact of the alternating current contactor KM1, so that the cooling fan unit is connected in series with the in-cabinet cooling fan; and the cooling fan unit and the main loop unit are subjected to hardware-level forced linkage, so that simultaneous start and stop are realized, the power consumption is saved, and the energy waste is avoided.

An example energy storage system for an electric vehicle includes a first battery pack having a first energy storage chemistry, which is electrically coupled in series with a second battery pack having a second energy storage chemistry. A charging circuit is electrically coupled with the first battery pack and the second battery pack, and includes multiple switches and a direct current (DC)-DC controller configured to obtain a current temperature of the battery packs, in response to the current temperature being below a low temperature threshold value, operate the multiple switches in an alternating current (AC) heating mode to increase a temperature of at least one of the battery packs, and in response to the current temperature being above a high temperature threshold value, operate the multiple switches in an energy movement mode to modify a state of charge (SOC) value of at least one of the battery packs.