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  • 20 2022-09
    How Much Do You Know About the Common Sense of Programmable DC Power Supply?
    Today, APM Technology will take you to understand the programmable DC power supply. Many people may not understand the DC power supply. It is a device that maintains a stable voltage and current in the circuit. For example, dry batteries, batteries, DC generators, etc. all use DC power, so today I will not explain to you a conventional DC power supply, but a kind of DC power supply, a programmable DC power supply. Common sense for programming the use of DC power supplies. (1) Application of inductive load When we turn on or off the programmable DC power supply or change the output voltage, the inductive load will generate an electromotive force in the opposite direction to affect the operation of the programmable DC power supply. In severe cases, it will also cause damage to the programmable DC power supply, so we need to connect a diode in series between the output end of the programmable DC power supply and the load, and connect a resistor and a capacitor in parallel to the load, so as to effectively protect the Program the DC power supply. (2) Battery load application When the programmable DC power supply is charging the battery load, we can prevent the power supply from being damaged by connecting the wrong polarity of the battery, so a diode is connected in series between the power supply and the battery, which can protect the programmable DC power supply. Safe use of power. (3) Pulse load application Even if the peak value of the current of the pulsed load is within the rated current range of the programmable DC power supply, or the waveform of the pulsed circuit or the motor, within the nominal value indicated by the metering equipment, the current will reach
  • 14 2022-09
    The Role of Programmable DC Power Supply
    Programmable DC power supply is a DC power supply that uses digital or encoder input to adjust voltage and current other than potentiometers. High-power programmable DC power supply is widely used in metallurgy, chemical and scientific fields, so how does it apply to life? First of all, it has: Tracking function - In some programmable power supplies, there is a function of inter-channel linkage, that is, the tracking function. The tracking function means that all outputs are controlled at the same time, and by keeping the voltage consistent with the pre-set voltage, they all obey the unified command. For example: if voltage 1 changes from 10V to 12V, then voltages 2 and 3 will follow from 5V to 6V, and voltage 4 will follow from 20V to 24V. However, if the maximum current of one of the outputs in the leading position has a limit value, and when the output current reaches the limit value, all other output currents in the subordinate position also enter the current limiting state at the same time. If an electronic fuse is installed in the device, the output that reaches this limit value will be disconnected, and all other outputs in slave position will be disconnected. Induction (SENSE mode - compensation for the resistance of the wire itself In normal mode, the voltage is directly loaded on the load through the wire, so as to keep the load voltage stable. Since the load current will produce a voltage drop on the connecting wire, the actual load voltage should be equal to the power supply. Subtract the voltage drop from the output voltage. If the power supply is set to output 3.3V/1A, and if the resistance of the output wire is 0.3 ohms, a voltage drop of 0.3V will be formed on the wire, and the actual voltage will become 3.0V, This is enough to cause the powered unit to not work properly. Similar to the four-wire measurement method when measurin
  • 22 2022-08
    APM Bring You Different Operation Experience
    There are three control modes for programmable power supply: panel control, external control and remote control. Remote control basically control via computer. In today`s eve-changing technology, mobile phone has become necessary part in working and life. So, could we use mobile phone to monitoring power supply? APM programmable power supply supports Web Sever remote control function. No need to download software. It could remotely access and control power supply via LAN interface and Web. Using wireless router could realize communication between mobile phone and power supply. Control power supply by mobile phone? Sounds excited let me have a brief introduction about it Middle power supply: Open browser, enter IP of power supply to access welcome screen. User ID is Admin, Pass word is 123456. Enter Home page after log in successfully. It could set and measure voltage/current of power supply. Moreover , it could display the operating status, control output of power supply, set protection value, set buzzer switch, set current sharing, set quick decline function, set switch on status of power supply, read basic information of power supply, modify LAN communication parameter and reset password. APM AC source has the same operation method with middle power DC source. No need to install software. It is availabl
  • 03 2022-08
    Application of APM Power Supply and E-load in New Energy Automobile Industry
    Climate change is the global issue human facing. As carbon dioxide emissions of countries, increasing of greenhouse gases has been a threat to biosystem. Under this background, countries in the world reduce green house gas to realize carbon peak and carbon neutrality via global agreement. Carbon emission will counteract via tree planning, energy conservation, emission reduction and others. As the implementation of [double-carbon" plan, electric automobile grew in popularity in our lives. China promote vigorously on development of new energy automobile. It could not only reduce city emission but also have low cost, play by heart! A domestic new energy automobile company mainly operates automobile power system technology research, engine, transmission, new energy motor, electronic control and auto part research. APM power supply SP80VDC18000W and E-load EL200VDC6600W has been successfully applied in this industry. APM provide stable and high quality test instrument to new energy automobile industry.
  • 02 2022-06
    APM Power Source Help in LED Test
    Quality of LED drive power source directly affects the quality of LED illuminating system. But drive power source is easier to damage LED illuminating system. To guarantee the safety, efficiency and reliability of LED drive power source, it must be strictly tested in R&D or production stage. LED drive power source test item contains AC power input range, power efficiency, power factor, ripple & noise, starting and continuous time, rise time, over-load protection, OVP, EMC and other parameters in LED drive power source performance index. Power source for test is required to provide stable output and simulate abnormal power supply such as variation of frequency and voltage. At the meanwhile, it needs to be equipped with completed protection function to satisfy the test requirement. APM SP-300 single phase programmable AC source is featured with high power density, high reliability and high precision. Its highest output frequency could reach to 1200Hz. Meanwhile it possesses operation interface of touch sc
  • 13 2022-05
    Advantages of SP-3U/6U Series Power Supply for Electrical Tools
    Test objects: power tools, DC motors, micro motors, etc. 1. Internal resistance simulation function, easily simulate the internal resistance changes of rechargeable batteries, fuel cells, etc.; Handheld power tools are mostly powered by batteries. SP-3U/6U series power supplies can simulate batteries to supply power to motors. This series of power supplies have internal resistance simulation function and provide an internal resistance setting interface with a resolution up to 0.0001Ω, which can easily achieve battery internal resistance simulation requirements. 2. The 100kHz switching frequency improves the response speed of the power supply hardware loop; This hardware architecture can effectively solve the problem of voltage overshoot caused by frequent startup of motor equipment (excessive instantaneous current) and long load line inductance. As below, the power supply voltage is set to 20V, the load current is dynamically switched between 0A and 160A, and the output is stable within the setting parameters 800μs.
  • 07 2022-05
    APM DC Sources and E-Load in Robot Testing
    Robot is a kind of automatic machine, the difference is that this machine has some intelligent abilities similar to people or creatures, such as perception ability, planning ability, action ability and coordination ability, is a highly flexible automatic machine. Industrial robots are widely used in the industrial field of multi-joint manipulator or multi-degree-of-freedom mechanical devices. They have a certain degree of automation and can realize various industrial processing and manufacturing functions by relying on their own power energy and control capabilities. Industrial robots are widely used in 3C, auto parts, semiconductor, photovoltaic, lithium batteries, medical and pharmaceutical industries, etc.. One domestic company, specializing in the research and development and production of industrial robots, has independently realized the full coverage of the research and development of core technologies such as the underlying positioning algorithm, operating system, and controller of the robot. APM SP-1U/2U series power supply and EL series electronic load have formed a test platform for the company's various controllers for one month of functional testing.
  • 28 2022-04
    APM Practical Tips on Products
    It's a new year with a better beginning. Here is a summary of some common problems and solutions from our customers in the past when using APM products, which we hope can effectively help our customers to improve the work efficiency. 1. DC-DC abnormality when use SP-3U/6U series power supply. Because SP-3U/6U series power switch is a strong power control switch, please operate quickly when closing or disconnecting and make sure that once in place to avoid pulling the arc to cause a large inrush current and trigger the hardware DC-DC abnormal protection. DC-DC abnormal protection caused by closing the switch is a normal phenomenon. Restarting the power supply to recover, to ensure that the internal thermal devices to restore the normal state, please wait 30s at least before closing the switch again. 2. The rated voltage of the 1U or 2U DC power supply cannot be adjusted. For example: SP40VDC1000W DC power supply output 40V, because the current limit value default of power supply is 40A, its voltage can not be set to 40V. The current limit value needs to be set to 25A at first. It can be simple to understand through Ohm's Law. But when you are working in a time crunch, you may be anxious and make the wrong judgment that the power supply is malfunctioning. 3. During the test, it is found that the electronic load does not pull the load, what problems need to be investigated? Firstly, check whether th
  • 21 2022-04
    Disable Output Function of APM AC/DC Power Supply
    Various performances of the product have a corresponding set of test methods, which also requires that the relevant test instruments must achieve a certain performance or have a certain function. The disable output function of APM AC/DC power supply:connect the corresponding terminal with the test product and set relevant settings in the menu. Once the tested product fails, change the level signal on the terminal to turn off the power output in time to reduce the loss. This function has been applied in some products test. The following describes one application of this function. The connection method of the terminal is shown as below figure. The power supply can output normally only when the switch is closed. If the tested product fails, the switch is off and the power supply output is also disconnected at the same time. The connection method of the terminal is shown as below figure; the triggering process is the same as that of the SP-1U2U series DC power supply.
  • 15 2022-04
    Battery Charge and Discharge Test Solution
    Carbon neutrality has become consensus of global development. Clean energy and low-carbon transition have become inevitable trend. It makes new energy new energy automobile industry keep growing vigorously as past ten years. It is also the crucial guarantee to realized low carbon in life cycle. With opportunities of carbon peak and neutrality targets, market penetration of new energy automobile has reach to 10%. Industry experts believe that new energy automobile is expected to account to more than 35% of new car sales amount in China. Recently, GM, Ford and Toyota successively announced plan of building battery manufacture or automobile assembly plant in US. High mileage, fast charge and battery safety are the requirement of customer to automobile. Constant fire accident and other trouble are exposed since new energy vehicles released. Safety, reliability and life time of battery tend to be concern by battery manufacture and new energy vehicles assembly plant. Hereby, APM specially develop high power source and E-load to fit the market demand.
  • 06 2022-04
    LED Dimming Function Test Solution
    The price of LED lighting has been declining rapidly year by year, making LED lighting gradually popular. Although LED lighting has been the most energy-saving lighting equipment, which has more energy saving effect than incandescent lamp and fluorescent lamp, there is still an important function of LED lighting that is not fully utilized at present, which is the dimming function. Dimming can not only save energy, but also significantly improve the comfort of lighting, conform to the sensitive dimming curve of the human eye, and significantly improve the environmental experience. There are five control modes for LED lighting devices on the market: front-cut SCR dimming, back-cut MOS dimming, 1-10VDC, DALI and DMX512. Front dimming is to use SCR circuit, starting from AC phase 0, Input voltage chopper, and there is no voltage input until the SCR is turned on. Its principle is to adjust the conduction angle of each half-wave of the alternating current to change the sinusoidal waveform, thereby changing the effective value of the alternating current, so as to achieve the purpose of dimming, which plays a dominant position in the market, most manufacturers offer this type of dimmer.
  • 29 2022-03
    Sync Output Function on APM DC Sources
    During the test of production, there are several of ways to test product performance. Some customers require multiple power source sync output different waveform. For this requirement, APM design below two solutions. . Software control Monitoring software of this series power source add global control function. With RS485 communication, it is available to connect 30 units of different models and there are two ways to set output parameters: 1. Set output parameters of first power source. Other power sources sync output setting parameters of first power source. 2. 30 units of power source set different voltage and current parameters respectively and then sync output. . Command control Via serial pot test tool, send output parameter to each power source.Using global command CALL to realize control multiple power source output. At the meanwhile, edit list waveform of each power source via command control. Then,using g
  • 21 2022-03
    To Start Convenient and Fast Test Experience on APM
    For application to production line test, priority will be given to the systematicness and convenience of the test function. It needs to avoid the inconvenience caused by tedious or complicated setting. Some users limited by test environment will hope to do away with parameter setting and output setting. Recently in a white household appliances production test line of one foreign customer, there are dozens of AC sources in production line as input source for DUT. This production line will power off for rest on weekends and power-on test next Monday. During the rest time, all AC sources will be placed in closed cabinet, unable to front panel control. Customer hope AC automatically set and output 230V/50Hz once power on. Do you want automatically set parameter of test requirement? Here we go~ Set USER in P/O State from System Setting screen. Then write the needed parameters in above screen. In next power-on, power source will automatically set user-defined parameter. Do you want automatically output when power-on? Here we go~ Set Auto in Output under System Setting screen. Power source will automatically output when power-on.
  • 14 2022-03
    APM Facilitate Mooring UAV Test
    Unmanned aerial vehicle (UAV) has been widely used in various fields due to its advantages of rapid deployment without human intervention. However, the short flight life of UAVs limits their large-scale application. Most drones use onboard rechargeable lithium batteries, which rarely last more than an hour. However, in some fields, such as emergency communications, on-site monitoring, on-site command and other fields, drones are required to be able to operate in the air for a long time. Therefore, drones powered by ground power through wires, that is, tethered drones, came into being. The tethered UAV system is generally divided into a ground part and an air part. The two parts are connected by cables. The ground part is generally composed of power supply and control parts, and the air part is generally composed of batteries, fuselage, sensors and other parts. Compared with other types of UAVs, tethered UAVs can stay in the air for a long time without power limitation due to the existence of cables. It has obvious advantages in emergency communication, aerial monitoring, environmental monitoring and other scenarios. It can realize fixed installation or vehicle installation and can follow the movement of the vehicle. The cost of the tethered drone is high, and the application is more complicated. Once the power supply system fails, it is likely to cause damage to the precise sensing or flight control system on the aircraft, and in some cases, there is a risk of crashing the drone. In order to avoid the occurrence of high losses, engineers designing drones have put forward higher requirements on the quality of power supply. After multiple comparison tests, the engineer of a drone manufacturer finally chose the APM high-power DC sources.
  • 04 2022-03
    APM New Official Website is Unveiled !
    Exactly Figure Out What You Need ◆ New page design and layout, giving you a different visual experience. ◆ Comprehensive enterprise introduction, understanding APM more intuitively. ◆ Quick selection and retrieval, more convenient access to product information. ◆ Added member center, one-click unlock new features More new ways to play, waiting for you to experience What is the difference for new official website of APM? Welcome to explore ■ The home page presents a basic overview, dynamic and updated information of APM, bringing you a real-time understanding of APM.
  • 21 2022-02
    Talk About Those Things About The Three-level Inverter Test
    With the continuous development of photovoltaic inverter and UPS technology and the continuous expansion of the market, the requirements for inverter efficiency have been paid more and more attention by manufacturers, and the three-level topology has emerged as the times require. Compared with the traditional two-level structure, the three-level inverter has the advantages of low voltage stress and loss of power devices, good output waveform quality, and high efficiency. It is a new direction for the development of photovoltaic inverter technology. The working principle of the three-level inverter circuit Each bridge arm of the three-level structure is composed of 4 IGBTs and 6 diodes. The typical topology shown in the figure below is to analyze the midpoint potential change of the A-phase inverter bridge arm as an example to briefly describe the three-level inverter circuit. working principle. When the two IGBTs on the upper bridge arm of the A-phase bridge arm are turned on, the potential of point A is the same as that of the positive busbar, which is U, and the stress platform voltage that each IGBT bears is U/2. When the two IGBTs of the lower bridge arm of the A-phase bridge arm are turned on, the potential of point A is the same as the potential of the negative busbar, which is -U, and the stress platform voltage that each IGBT bears is U/2. When the second IGBT on the upper bridge arm of the A-phase bridge arm and the bypass clamping diode are turned on, the A-phase inverter brid
  • 11 2022-02
    Why Should A Real Voltage Source BE Considered When Designing A Reliable Power Supply?
    In actual use, the source of power is never ideal. Building a reliable power system requires consideration of real-world behavior, including parasitics. When using power supplies, we want to make sure that DC-DC converters such as switching regulators can handle a certain input voltage range and produce the required output voltage with enough current. The input voltage is often specified as a range because it is often impossible to adjust precisely. However, for the power supply to work reliably, the input voltage must always be within the range allowed by the switching regulator. For example, a typical input voltage range for a 12V supply voltage is 8V to 16V. However, when designing a DC-DC converter, it is not enough to consider only the input voltage minimum and maximum values. Figure 1 shows a buck converter with a switch at the positive input. This switch can be turned on or off. The switching speed should be as high as possible so that switching losses are low. However, this causes a pulsed current to flow on the power line. Not every voltage source can provide these pulsed currents without any problems. Therefore, the voltage at the input of the switching regulator drops. To minimize this, a backup capacitor needs to be used at the power input. Figure 2 shows the circuit from Figure 1, but this time showing both the parasitic elements of the power line and the voltage source itself. The internal resistance of the voltage source, the inductance and resistance of the power supply lines, and any current limiting are key characteristics of the voltage source that must be considered in order for a switching regulator to function properly. In most cases,
  • 22 2022-01
    Is The Power Supply Working For A Long Time Still Able To Run Stably?
    In the design of electronic equipment products, the quality of power supply products will directly affect its technical performance and work safety and reliability. When there is a problem with the power supply, the entire product will be paralyzed, and the comprehensive testing of the power supply product is particularly important. Let's take an electric motorcycle charger as an example. As one of the four major components of an electric motorcycle (controller, charger, battery, and motor), the charger is an important part of the electric motorcycle and directly affects the safety of the electric motorcycle. . Inferior chargers may cause serious consequences of electric shock, fire or even explosion. Therefore, the charger will undergo rigorous testing and certification in the stages of research and development, production, and certification. An important circuit component of the charger is the switching power supply. When the power supply runs for a long time, the problem of unstable voltage and current will occur, and even overvoltage, undervoltage, overload, overheating, etc. may cause equipment damage. Therefore, it is necessary to strictly carry out all-round tests on the input, output, abnormal working conditions, switching devices, etc. of the power supply, and conduct durability tests to verify the stability of the product. All-day Technology originated in 1989 and established its own brand in 2012. It is a high-tech enterprise integrating independent research and development, production, sales and service. With the test source/load as the core product, we provide a full range of comprehensive solutions and services. Products are widely used in aerospace, new energy, power electronics, intelligent manufacturing, scientific research and education and other related fields. With many years of profound
  • 18 2022-01
    New Arrival– EL Series DC E-load 4U/8.1kW
    APM is committed to exploring advanced technology and application in T&Mfield as well aspromoting iteration and innovation of products. Recently, APM upgrades EL series DC load which add 4U/8.1KW model with Ultra high power density compared with other brands. It contains 200V, 600V and 1200V three output voltage range. Power range of single unit covers from 600W to 27.9kW. Current range of single unit could reach to 2880A. It is extendable to 558kW via parallel connection. Supports CV, CC, CR and CP basic operating modes, as well as CV+CC, CV+CR, CR+CC complex operating modes. It contains multiple protection function. Built-in RS232.RS485.USB.LAN&GPIB communication interface. It is wide applicable to automotive electronics, battery charge and discharge, DC charging pile, power electronics and other field. Main characteristic Ultra high power density Flippable front panel and color touch screen 50kHz high-speed CC/CR dynamic mode 500kHz high-speed voltage and current sampling rate Supports external analog control function Ultra high precision voltage & current measurement Adjustable current slew rate, adjustable CV loop speed
  • 11 2022-01
    Test Challenges for Third Generation Semiconductor Devices
    It is no exaggeration to say that the third-generation semiconductor devices have brought innovation to the power supply industry. Based on their high speed, small size, and low power consumption, they are more and more widely used in consumer electronics and power electronics industries. Let's first take a look at the differences between power devices of different technologies. The figure below shows that traditional Si-based IGBTs or MOSFETs are either distributed in the high-voltage and low-speed range, or in the low-voltage and high-speed range. The traditional detection technology on the market can Covers test requirements for device characterization. However, the technology of the third-generation semiconductor device SiC or GaN tends to mature, because of its high speed, high withstand voltage, high temperature resistance, small size, and low power consumption, it is more and more used in power conversion products, which is different from traditional performance. However, Si-based power devices have greatly expanded the distribution range, covering high-voltage and high-speed areas that have never appeared before, which poses a very severe challenge to device testing tools. This year, SiC and GaN devices will be more and more widely used in the fields of 5G communication power supply, new energy inverter and electric vehicle drive in the new infrastructure released by the country, which brings more opportunities for engineers to design power converter products. Many opportunities have also brought new design challenges. At present, many engineers use low-side switching characteristics to evaluate devices and design driving circuits in bridge circuit design. Because there is a "ground" reference, it seems that as long as the bandwidth and voltage range are satisfied, it is enough, but in fact, many people ignore it. In fact, the drive and characteristics of the high-voltage side and the low-voltage side are not the same, and the upper-tube test c
  • 04 2022-01
    How to test the capacity of battery via E-load
    ll kinds of batteries could be seen in daily life. Different battery has its own capacity. Even though the same kind of battery also has different discharge current,which make it have different output capacity. Battery contains several parameters such as battery standard voltage, battery capacity, and maximum output power and so on. Most people may concentrate on battery capacity. Under specific condition (discharge rate, temperature, end voltage), power released by battery is the capacity of battery. It is normally measured as ampere-hour. APM E-load especially provides three discharge modes for battery discharge test: constant current, constant resistance, constant power mode. Through setting end voltage and end time, E-load could correctly stop loading to avoid battery damage caused by over discharge. Test procedure is as below: 1. Connection before test Connect the positive and negative terminal of battery and E-lad. Under the circumstances of high current, there will be voltage drop in cable. Current measurement value in E-load will be lower which may cause effect to measurement. To eliminate this phenomenon, it is available to use remote compensation to eliminate voltage 2. Please set the shutdown condition When testing battery in batter mode, it is necessary to set a shutdown discharge condition. APM E-load has below 4 shutdown test condition: End voltage, overtime, end watt hour and end ampere-hour. When satisfy one of four conditions, battery discharge test will shutdown.
  • 24 2021-12
    In Order to Complete the IEC61000 Electromagnetic Compatibility Test, How Many Waveforms Have You Set?
    Electromagnetic compatibility (EMC) testing is a test item that almost all electronic product manufacturers must comply with. The EMC standard is divided into two parts: electromagnetic emission and immunity test. The IEC61000-4 series standard is a basic standard promulgated by the International Electrotechnical Commission focusing on product immunity test. The electromagnetic compatibility of electrical and electronic equipment has different requirements. In the relevant test regulations, electronic product manufacturers need to find high-performance AC power supplies to fulfill the power supply requirements of special waveforms. Take IEC61000-4-11 as an example. This is a standard test widely carried out at home and abroad. The domestic standard adopted is "GB/T 17626.11-2008 Electromagnetic Compatibility Test and Measurement Technology Voltage sag, short-term interruption and voltage change Immunity Test." Regulations require that the test should be carried out under the typical working conditions of the object to be tested for voltage sag, short-term interruption and voltage change. If it is a three-phase power supply system, test one phase and one phase. Do each item 3 times with an interval of 10 seconds. It can be seen in the short-term interruption test that according to the different objects to be tested, different types of parameters need to be selected, including custom tests according to equipment requirements. If the user's product is sold globally and there are models that meet different power supply conditions, you need to edit multiple LISTs and call them one by one during the test. This increases the work of the engineer to edit and select the waveform, and it is difficult to intuitively understand the parameters of the running test during the test. The built-in regulatory test function of
  • 17 2021-12
    Explain the Working Mode of DC Power Supply: CC or CV
    First of all, we need to understand what the CC and CV modes of DC power supply are: Constant voltage mode (CV mode) Constant voltage mode (also called constant voltage) means that the current value of the load changes within the rated range while the output voltage of the DC power supply remains stable. That is, when the load changes and the output current changes, the output voltage remains At the set voltage value and remain unchanged. Constant current mode (CC mode)) Constant current mode (also called constant current) means that the resistance value of the DC load changes within the rated range, while the output current of the DC power supply maintains a stable working mode, that is, when the resistance value of the load changes and the output voltage changes, The output current remains at the set current value and remains unchanged. Ohm's Law: Simple definition: In the same circuit, the current passing through a certain conductor is proportional to the voltage at both ends of the conductor and inversely proportional to the resistance of the conductor. This is Ohm's law. Notice: The unit of the physical quantity in the formula: I: (current) is in amperes (A), U: (voltage) is in volts (V), R: (resistance) is in ohms (Ω). APM DC power supplies have a constant current and constant voltage mode. According to Ohm's law, all DC power supplies output and maintain a certain voltage or current, but in fact the output of the power supply depends on the voltage, current setting value of the power supply and the load connected to the power supply The resistance R. The states of constant voltage mode and constant current mode
  • 10 2021-12
    How to Simulate and Test The Temperature Control Mechanism of EV Battery System?
    As car manufacturers continue to improve endurance to overcome the driver's mileage anxiety, the energy density of the large batteries onboard has gradually increased, which means that the temperature monitoring function of the battery system needs to be more perfect. In order to ensure the service life of the battery and avoid battery thermal runaway, whether it is under normal driving or fast charging, the design of the battery system needs to consider the heat dissipation strategy and overheating protection mechanism. Generally, the battery system of a pure electric vehicle (BEV) has about 100 temperature measurement points, and each measurement position represents the battery temperature status in this area. The overall temperature distribution status is collected by BMS, and monitored and judged by BMS As a result, the vehicle's temperature control strategy can be revised in real time, such as improving water cooling efficiency and limiting battery charge and discharge current. Because of the importance of the combination of battery temperature control mechanism and BMS, existing testing laboratories and battery manufacturers have proposed verification requirements for battery temperature control and BMS judgment mechanisms. In the test process, in addition to requiring temperature measurement accuracy and temperature reading synchronization, it also has a detection function that can simulate temperature control changes in real time when the temperature changes. In this regard, APM`s battery test system can obtain the internal and external temperature values of the object under test through CAN Device or Data logger, and then the upper software Battery Pro software makes real-time judgment and command transmission, which can adjust the charge in real t
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