Is the electric car charger model a multi-functional model or is it paired according to the electric vehicle model?
All chargers with perfect design and manufacture can be used. Generally, it is divided into three categories according to the output power: battery charging of information electronic appliances, such as mobile phones and MP3 players; Electric vehicle battery charging; Car battery charging. In the industrial and transportation industries, there are also batteries for railway locomotives, wharf forklifts, telecommunications and servers, and program-controlled telephones.
For electric vehicles, there are 24V, 36V and 48V output voltages, which can limit the final charging voltage; Output current 1A, 2A, 3A, 4A is basically universal. As for whether to charge in multiple ways at the same time, that was the basis 30 years ago. Miners in other people's coal mines are charging in batches.
In fact, it is difficult to give consideration to the design of charging long-distance targets. Specifically, there are no elevator residents at the top floor, and chargers are installed indoors. Low-voltage, ground-based electric vehicles are charged through wires 50 meters to 100 meters long. To ensure that the charging current intensity is sufficient, the charging voltage of the terminal should not exceed the standard at the end of charging. If we want to meet the comprehensive requirements of low power consumption, we need higher skills, such as how to minimize the discharge current of the charged battery to the control circuit without charging power supply. There are many ways to choose from. The DC resistance of the actual long-distance charging line may be 10 ohm to 30 ohm. How to limit the charging voltage, output a constant current, measure the battery voltage, measure the battery temperature rise, and measure the battery bulge, instead of using a four-wire charging power supply (even the basic circuit design of a four-wire voltage-stabilizing and current-stabilizing power supply is not possible for many people in universities now)? Perfect design should ensure automatic protection when the polarity of the charged battery and the charging power supply is abnormal (China disclosed the information 35 years ago, and now the battery connected to the reverse switching power supply will explode! ! ! ), for high-energy batteries, it is particularly emphasized that the charging voltage must not have high-voltage pulse burr, which is easy to cause battery explosion! ! ! Ordinary switching power charger is not suitable.
Because of unemployment and being laid off, I was forced to retire ten years in advance, so I will not release the relevant designs that have been put into practical use for free. This is the responsibility of the Overseas Chinese Affairs Office.
I charge the electric car through the 100 meter long low-voltage line. There is a diode in the battery box to prevent malicious discharge. The diode is connected in parallel with a resistor of several hundred ohms, so that the voltage of the battery pack can be measured remotely (after the charging power supply is cut off, it is measured with a pointer voltmeter on the charger, and the diode is connected in series between the voltmeter and the charging power supply to prevent the battery from discharging the charger and reduce the reading of the voltmeter). Through more means, we can measure whether the electric car is stolen. Of course, the improved circuit is very complicated. There is a perfect electronic circuit on the side of the electric vehicle to ensure that the charging power supply voltage far exceeds the rated charging terminal voltage of the battery, and the battery will not be overcharged after charging.
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Kneel for the circuit diagram of 24V30A charger
There are many such products on sale now.
Customize your own high-power transformer. Generally speaking, the output AC voltage is 24 volts to 33 volts, and the power is 1 kw (it should be volt-ampere). Pay attention to draw more heads between the secondary 24 volts and 33 volts.
The simple method is full-wave rectification of the secondary output and direct output to the battery. The ammeter should be connected in series and the voltmeter should be connected in parallel. The output voltage and output current should be manually adjusted by the switch of industrial appliances (rich in Zhejiang Province), and manually adjusted according to the charging process. As for the charger with automatic voltage stabilization and automatic current stabilization, the control mode information of SCR has been published and printed 35 years ago. The simple emergency method is to use a running lamp transformer (36V safe voltage output), an isolation transformer and an electric welding machine transformer with sufficient power to make several turns on the secondary stage and connect them in series in the forward or reverse direction, so as to adjust the output voltage and charging current to a suitable range.
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How to remove the black oil from the bicycle chain on the school uniform?
Remember, the chain of advanced bicycles abroad uses lubricating paste similar to floor wax and car polishing wax. At first glance, there is no color on the chain. Ordinary floor wax and car polishing wax can be used instead. Clean the chain with diesel oil and kerosene before use, not gasoline! ! ! Including washing gasoline, it's too dangerous.
You use an external variable-speed bicycle, right? I modified several ordinary external variable-speed bicycles and added flexible chain sleeves to show them to a Japanese academician and doctoral tutor. The vast majority of external variable-speed bicycles have no transmission chain cover, and a few plastic external variable-speed bicycles produced in Taiwan Province Province also have no transmission chain cover. At present, half of the smuggled Japanese bicycles are internally variable-speed, and the steel of bicycles is good, light and durable. However, a good horse with a good saddle needs to choose a good lock;
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Why not made in America?
During my stay in the United States, I couldn't find American products when I bought local specialties!
Parts in electronic products, machine tools, mold materials, key metal materials and chemicals that produce molds for domestic export products. American manufacturing is everywhere, and it is in the basic and key parts. You should analyze China's manned spaceflight project, the design, manufacture and materials of military equipment. Therefore, the United States stipulates that if the satellites of the United States and its allies contain American elements, China will not be allowed to launch satellites, and China's business of launching satellites for foreign countries will be compressed to individual third world countries. Even if the production place of this equipment is not in the United States, the patent of production equipment and design technology may be in the hands of Americans. These are all public information, and there are many online in China. I am an expert in design and manufacturing, and I know these limitations.
The simplest and most natural textiles, printed matter, bamboo and wood products, dyes, pigments, inks, pesticides, quarantine inspection, etc. Are indispensable. Whether it is self-purchased instruments or entrusted inspection, the cost is comparable to the material procurement cost of the whole batch of manifests. What lead-free welding materials (electronic products are essential, and resistance bonding cannot always be used), environmentally friendly zinc alloys (commonly used materials for handicrafts), and environmentally friendly copper are all thresholds.
For example, Yili Company invested more than 7 million yuan, and Mengniu Company invested more than 10,000 yuan 10, and urgently purchased advanced detection instruments such as ELISA, HPLC, HPLC-MS and GC-MS..
As far as cheap handicrafts are concerned, without the identification of various testing instruments made in the United States, such as hand-held high-energy ray nondestructive testing, these products cannot guarantee to meet the safety standards of the United States, and some materials, coatings, production equipment and technologies have to be imported. The system and theory of modern science are all established in the west, and we are all marching in other people's routines. People have a long history and most of their energy is concentrated on infrastructure. Your attention is only focused on a few cutting-edge products, which is only a very small part of the western market. The investment share and consumption ratio of industrial technology and equipment in western industrialized countries are opposite to that in China.
Finally, the following suggestions are put forward for the development of China:
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Why are foreign labor costs more expensive than domestic ones, but cars are cheaper than domestic ones?
This is the embodiment of the industrial base.
In areas with weak industrial and theoretical foundations, the cost of building cars is high and the performance is far less than that of developed countries. It is the same for all industrial manufacturing industries, including missiles, airplanes, electromechanical products, mold manufacturing, bearing manufacturing and so on.
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At present, it is found that melamine in milk powder is artificially added or not completely removed in the production process.
Many imported instruments, such as infrared spectrometer, gas chromatograph, liquid chromatograph, mass spectrometer, laser scatterometer, nuclear physics detection instrument, etc. It can not only analyze whether there is melamine, but also distinguish artificially added starch, oil and protein from natural oil in milk and protein's fingerprints, and also distinguish gene fingerprints; In layman's terms, it is the truly harmless protein in dairy products, which can accurately distinguish the respective contents of natural protein and artificially added protein in milk. This is a very simple routine operation, and the technology is completely open. Large dairy enterprises have complete sets of related series of supporting instruments, and the rest is up to you to answer.
The discussion in Sanlu milk powder, yours and netizens', is unprofessional. At present, the detection results of various imported instruments, such as chromatography instruments, are many curves like overgrown peaks, the height of the "peak" is the content, and the protrusions and unique burrs of each known structural substance "peak" are "fingerprints", which reflect the characteristics of different substances. It is enough to draw a curve for normal milk. Once new substances, even trace amounts, are added, new "peaks" will appear in new areas; The height of the peak is its content.
It's like testing a new radio station with a field strength meter and a frequency spectrometer.
What doping testing, pesticide testing, are done in this way.
Print out the "fingerprint" and curve of a known single substance, and you can compare them conveniently.
Please take a walk to the analytical instrument factory. If the composition of Chinese patent medicine is complex, it can also be analyzed whether natural bezoar or synthetic bezoar is used.
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Is there a chicken or an egg first in the world?
The chicken comes first, and the early chicken has no eggs. With its evolution, the physiological structure and tissue morphology of chicken also evolved, gradually transitioning to eggs.
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What did Shenzhou VII fly out at the moment it opened the cabin?
Internal and external imbalance, the flow rate of the air release valve does not drop, the medium is not completely released, and the diffusion is determined by time and the cross-sectional area of the channel. Without backwashing, you need to use a vacuum pump for active exchange, which can't be done naturally in a short time. The vacuum system also needs to cascade pumps with different principles. Moreover, the porous materials, foaming materials, interlayers, thermal insulation materials and textiles in the space suit and cabin all have gas adsorption, which is not released immediately after decompression, and there is a delay. Technically speaking, the term is the diffusion rate of gas molecules, and the effective cross-sectional area of the communication hole between some cavity structures and cabin space is too small; Vacuum technology has the process of heating to remove metals and nonmetals to represent gas absorption. Electron tubes and incandescent bulbs have gas adsorbents. An electron tube is a small metal box with holes near the filament, which contains a gas adsorbent. Idiot light bulb coated with phosphorus getter on glass rod.
There are liquids in the cabin, such as sweat drops, water vapor, lubricants, grease, volatile organic compounds, fingerprints left in the process of processing and manufacturing, body fluids, etc., which evaporate rapidly in a vacuum environment and expand rapidly in volume. In the future, the cabin should be cleaned with solvent before liftoff, baked and degassed to minimize the residue of cleaning agent.
This is the reason why the hatch is forcibly opened by unknown pressure and the object flies out of the cabin, which shows the flow direction of the medium.
When the sealing rubber strip of the cabin door is under pre-pressure and one side is in vacuum environment, the gas release of the rubber strip will inevitably adhere to the airtight surface, which makes it difficult to open the cabin door after decompression. The solution is to change the opening mode of the door sealing strip from rigid integral opening displacement to flexible structure, and adopt non-planar integral displacement and non-circular local gradual displacement to open the door, which puts forward higher requirements for the design, processing and reliability of the door, and can partially establish gas microchannels to generate expansion space to reduce the difficulty, such as turning annular slots or drilling many fine holes on the annular sealing surface, and increasing the valve to release nitrogen to assist opening. In the future, these cabins will be sent to vacuum environment equipment for heating and baking before launch, so as to remove gas adsorption and pre-evaporation of evaporable substances, and increase the diameter and effective cross-section of the vent valve when the reliability and industrial basic conditions permit.
The electric energy storage shock absorber was notified to China Aerospace Department several years ago and used in astronaut seats.
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What impressed you most about the successful launch of Shenzhou VII and Shenzhou VI?
The industrial base is poor, there is no accumulation, it is too hard to do, and it is not innovation. It is a systematic integration of international technology and finished products, which cannot stimulate economic construction and does not belong to sustainable development and value-added activities. People's basic physical quantity measuring instruments, chemical analysis instruments, electronic instruments and mechanical instruments can all be fine and sensitive to minus 20 power, and China will be minus 6 power. How to use space technology to sell basic instruments? ; People can innovate independently without the environment at that time. At that time, the level of design and technology reflected endless leading ability, so they could turn relevant progress into new products and processes on the market. MIT's latest textbooks are published on the Internet. Have you got the actual ability to catch up with the top scholar? During the Cultural Revolution, China was independent and self-reliant, but really mastered the basic industrial manufacturing capabilities. Can it be realized now without relying on foreign manufacturing equipment? The maintenance ability of machine tools is not as good as it used to be. If a large number of industrial valves and pumps can be exported to Germany and the United States with self-made machine tools and smelting materials, and the quality is better than their top valves, it is indeed space technology that has promoted the scientific and technological revolution in China.
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The landing attitude of the spacecraft?
From Shenzhou 5 to Shenzhou VII, the attitude of the return capsule is different every time it lands.
First, briefly explain the picture video as follows; For the launch and landing of this kind of spacecraft, there are online tracking records of infrared photoelectric theodolite, radar theodolite and visible light film photoelectric theodolite, which track each other dynamically and jointly in real time, and report their tracking dynamic parameters to the Internet. If one of them is lost, it will move in the deviated direction under the automatic guidance of other tracking instruments, and try to re-lock the target. This is not original by China. Foreign countries have already done this. The public images you see are all off target. No matter how good the images are, they will not be made public, which directly reflects the country's inertial technology and attitude control level and is a comprehensive embodiment of aerospace technology strength.
The defensive strategic weapon systems developed by the United States, namely the National Missile Defense System (NMD) and the Theater Missile Defense System (TMD), have a short film in which the liquid fuel engine controls the missile defense device to hover in the air, which was conducted in the ground laboratory. As most people know, the missile defense system is designed to attack high-speed targets. In fact, the acceleration of missile is high, but the acceleration of automobile is low, so the sensitivity and drift of inertial instrument are very prominent. Generally speaking, gyro system requires high sensitivity, and gyro drift is the square relationship between its output error and time. The working time of the missile is short, but the time drift of the inertial guidance instrument is not prominent. However, due to the slow movement speed and long working hours of robots, the requirements for time drift control are higher than those of automobiles. Americans show off their attitude control ability by playing short films hovering in the air, which fully embodies the precise control ability of liquid fuel engines. Speaking of which, I answered your question from the side. Lu Yongxiang, president of China Academy of Sciences, applied for the patent authorization of proportional valve invention in Europe and America. You can ask about the proportional transportation of liquid fuel, advanced control technology, the combustion state of liquid fuel engine and the difficulty of high-speed proportional control of thrust.
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Is computer embroidery better or mold repair better?
Hello, insider. Let me ask you a question. For a boy, if there are two choices, computer embroidery or mold repair, which one should be more developed? I asked to see my brother. Please give a clear explanation. thank you
Mold manufacturing and trimming is a basic and basic hard work, which has a far-reaching impact on people's lives. Manufacturing is the foundation of the country and the real kung fu. Computers are suitable for the elderly, playboys and ladies. You have to learn to change models and generations of machines, and there will be no substantial accumulation in the future.