First of all,
From various safety requirements,
220V AC power supply lines should not be hung outside the wall,
even if it is low voltage Lines,
hang from high-rise buildings,
the conductors of network cables and ordinary telephone lines are too small in cross-sectional area and poor in strength,
such conductors themselves cannot withstand the Such weight and pull.
Hang it from a high-rise building to charge an electric bicycle on the ground floor or basement.
You can only extend the low-voltage wire.
The charging current is generally 2 amps. Circuit strength,
There are certain limitations to the total resistance of extended wires,
especially for lead-acid battery charging,
Chargers correspond to different charging currents, and the output voltage of the charger is different.
When the total resistance of the extended wire is too high,
the charger will cause the initial charging current to be too high. Small,
Consider the battery to be fully charged,
Use the green light status at the beginning,
Charge with low voltage and small current,
The result is that the lead-acid battery cannot be fully charged even after being charged for several days.
Even if it is initially charged with a red light, high voltage, and high current, it only turns to the green light charging state shortly after the red light turns on.
For lithium batteries, charging with slender wires is still allowed, but the charging time is long.
Depending on your environment,
you must use a medium-level medium-voltage conductor to supply power between your high-rise residence and the ground floor.
That is, use a rated voltage 48V lead-acid battery charger,
transmits electrical energy through wires between your high-rise residence and the ground floor.
On the first floor,
there is a DC power supply that allows the input voltage of 20V to 60V to be converted into a DC power switching power supply.
This switching power supply also has a lead Acid batteries usually require two charging states of red light and green light,
specified output voltage value, and specified output current range.
I have made it more perfect,
For 4 lead-acid battery units,
There is a switching power supply with completely independent output and a rated output voltage of 12V,
For independent charging of each battery unit,
This charger has a maximum output voltage of 14.8V when the light is red, and limits the charging current to less than 2.0A;
When the light is green, the output voltage is stable at 13.5V and the charging current is limited to less than 2.0A.
There are 4 such switching power supplies, all accepting input supply voltages from 20V to 60V.
In fact, the input power supply range of these switching power supplies is guaranteed to be 22V to 150V under the output power.
Each switching power supply and the resistance of the startup chip will, after the startup is completed, All are automatically and completely disconnected.
This disconnection operation consumes less than 10mW, which is the true level of micro-power consumption in the international aerospace field.
And, more than 20 years ago,
I realized long-distance two-way transmission in this 2-wire system.
With the above engineering and technical support,
you can use ordinary network cables, or
use ordinary telephone lines for long-distance charging.
The diameter of copper cores in current telephone lines and network cables is generally 0.4 mm. There are also many network cables with 4 copper cores and 4 iron cores.
Exceptionally good network cables and telephone cables, the copper core diameter is 0.6 mm.
Generally speaking, for the extended low-voltage output line of a lead-acid battery, the total voltage drop of the line should be 2V (the rated battery voltage is 48V. If the rated battery voltage is lower than 48V , the total voltage drop of the line must be reduced).
Please measure and calculate the specific resistance and voltage drop of the longest line yourself.
How to charge an electric bicycle without running a charging line from a high-rise residence to the ground floor, which does not have AC power from the grid:
During the day Use the solar cells outside the small house to charge the intermediate transition battery inside the small house.
At night, use the intermediate transition battery charging inside the small house to charge the battery on the electric bicycle.
Hehe,
A world-class creativity! ! ! !
What are the rewards?
Your question is:
The small storage room on the ground floor of your house that you control personally can put your electric bicycle in at night.
But , this small storage room cannot be pulled from your high-rise residence to pull a wire to this small storage room to charge your electric bicycle.
Because there is no elevator in this house,
You don’t want to disassemble the heavy battery from the electric bicycle,
and move it to the building with great pains. Go up and charge.
A more advanced method is to use high-power density electrical energy storage devices,
transport them from high-rise residences through elevators.
The first step of transportation To charge the electric bicycle's battery,
this requires a high-performance switching power supply.
Accurately,
is to charge each independent battery unit with a rated power supply voltage of 12V,
In this way,
several completely independent chargers are needed,
absolutely balanced! ! !
The most advanced charging method,
If it is the same for lithium batteries,
3.7V or 4.2V independent charger.
Is our country’s education system rubbish?
Each country has its own environment and cultural traditions and cannot be generalized. Textbooks and courseware from the Massachusetts Institute of Technology in the United States are published online for free, and Chinese people all over the world are also volunteering to translate them. Anyone can learn it, and there are so many people who can pass the exam. How many countries can be like him?
I used to go to student dormitories and guide students to learn analog circuits for free. I also purchased components, materials, LCD panels, and computers at my own expense for them to conduct experiments. I also tutored them in building mathematical models and guided them in writing for free. Invention patent documents.
For general experimental problems, they were guided on the spot to solve them by themselves. Cash support that does not need to be repaid was once provided even to students from decent families.
If students are really interested in this industry, have anything they want to know, have any doubts, or encounter any unsolvable problems, just come and ask me, as long as they know something personally and have personal experience. I know everything from experience, and I will answer it immediately and without reservation.
I have always wanted to open a free video website and provide free guidance to students across the country. However, the school strictly prohibits me from using computers, oscilloscopes, and servers, and I have no working space at all.
As a result, Hu Jiang Junshu was offended.
He still persisted even after he was forced to lay off his post.
How to start an electric vehicle charger wholesale business
Make sure to provide free circuit diagrams, fully disclose the design drawings, fully introduce the purchase location of all spare parts, and sincerely explain in detail the repair faults Test method! You will have an exclusive monopoly on the national market!
The copper wire diameter is 1.2 mm, the conductor cross-section is 1 square millimeter, the resistance is 1.5 ohms for 100 meters, and the total resistance is 1.5 ohms for 50 meters of double strands.
The copper wire diameter is 1.6 mm, the conductor cross-section is 2 square millimeters, the resistance is 0.8 ohm for 100 meters, and the total resistance is 0.8 ohm for 50 meters of double strands.
The 8-core network cable has thick and thin copper cores, and some have 4 copper-plated iron core wires. Even if each copper core has a diameter of 0.3 mm, the cross-sectional area of ??the wire is 0.07548 square millimeters, and the resistance is 100 meters. 23 ohms, 4 wires are connected in parallel to form one wire, and the two wires are connected out to 50 meters, with a total resistance of 5.8 ohms. The total resistance of 10 meters is 1.16 ohms.
It depends on what kind of charger it is, and whether it has a fixed output voltage or a three-stage intelligent one.
For a charger with a fixed voltage output, the output side DC The resistance can be larger, within 1 ohm, up to 5 ohms.
For the three-stage type, the DC resistance of the wire is smaller.
If the wire is long, the battery will not be fully charged even if it is charged for more than 10 hours.
For specially designed chargers, medium-voltage power supply is used, which can charge electric vehicles 100 meters away. The wire resistance can be 10 ohms, and small-section wires can also be used to charge each 12V battery individually. , after charging is completed, the charging voltage is automatically reduced, and the charging status of each battery can be remotely measured.
This is Kung Fu.
Please ask for the circuit diagram of the 24V30A charger
There are many such products for sale now.
To make it yourself, you need to customize a high-power transformer. Generally speaking, the output AC voltage is 24 volts to 33 volts, and the power is 1 kilowatt (should be volt-ampere). Pay attention to the secondary voltage of 24 volts to 33 volts. Take a few more heads in between.
The simple method is to use full-wave rectification of the secondary output and output it directly to the battery. An ammeter must be connected in series, a voltmeter must be connected in parallel, and an industrial electrical switch (which is abundant in Zhejiang Province) can be used to manually adjust the output voltage. And the output current is manually adjusted according to the charging process. As for chargers with automatic voltage stabilization and automatic current stabilization, 35 years ago, information on the control methods of thyristors was publicly published and printed. A simple emergency method is to use a portable lamp transformer (36 volt safe voltage output), an isolation transformer, and a welding machine transformer with sufficient power, wind the secondary several times, connect it in forward series or reverse series, and adjust the output voltage and charging current to suitable range.
I just got a new battery for my electric bike. The charger light is still red after charging it all night. Is it a problem with the battery or the charger?
I just replaced the battery with a new one yesterday. The charger light was still red after charging it all night. Is it a problem with the battery or the charger?
It turns out that my old battery had a red light no matter how long it was charged. The battery was very hot, so I replaced the battery, but now the charger still does not turn green.
The original battery was 10A. Now it is replaced with a 12A battery. The charger is 1.8A. Can it charge a 12A battery?
Additional question:
It turns out that my battery was so badly deformed that I replaced it with a new one. I charged it for 12 hours every day.
That’s it. Two aspects need to be discussed;
The first is to use a voltmeter to measure the output voltage of the charger in the no-load state without connecting the battery.
Then measure the output voltage after charging for more than ten hours. For charging voltage and charging current,
it is safer for you to buy an ordinary analog three-meter. You can usually connect it to both sides of the output terminal of the charger to measure the voltage, and always pay attention to the changes in the voltage. I purchased a universal, single-purpose pointer voltmeter and connected it in parallel to the charger to continuously observe the changing process of the charging voltage. As for the normal range of charging voltage, there are many web pages on the Internet that introduce it in detail, so please search it yourself.
The above task is to determine whether the output voltage of the charger is out of control.
Because Jiang Hushujunzhuo forced me to lay off my job, the following content is a brief introduction;
Even chargers that meet the factory standards of various domestic factories, even those three-stage smart chargers , even a computer-controlled charger connects several batteries in series for charging. No matter how new the batteries are and how consistent their performance is, after several charge and discharge cycles, the voltage and capacity differences of each battery will become larger and larger. , the common fault phenomenon is that some of the batteries are bulging.
If new and old batteries are used together, the probability of such failures is higher and more frequent.
So, if possible, use a separate charger for each battery. This is a comprehensive consideration for charging the electric bicycle battery from a high-rise residential building downstairs!
Especially the individual remote control and telemetry of the charging process of each battery.
I have long-term experience here. For example, there is a universal charger upstairs, and there is also an ultra-low voltage drop difference charging controller built with discrete components on the electric bicycle.
You should ask those college entrance examination top scorers, integrated circuit design graduate students, and doctoral tutors to help you solve your actual needs. Their monthly salary starts at more than 10,000 yuan. I am a place where I receive social relief.
High-rise buildings are designed to charge downstairs batteries and remotely charge them.
Use medium and low voltage power transmission, and use completely discrete components to build ultra-low voltage drop circuits, remote control, and telemetry circuits. ,
Try not to use a single-chip microcomputer to reflect high-quality design capabilities, and achieve timing control, automatic adjustment of charging voltage, and automatic adjustment of charging current.
With the 48V1.8A charger for electric vehicles, after extending the output cable by 30 meters, can I use a 48V2.5A or 48V3A charger?
Because I live on the fifth floor and the electric car is on the first floor, charging is very inconvenient.
If you use the original charger, the battery is often not fully charged after extending the charger output end (extending the 220V end is not very safe)!
This is a specially designed charger.
One of my methods is to increase the output voltage of the existing charger and have another coordination circuit on the bicycle. Because there are actually requirements for voltage reduction at the end of charging, a complete circuit must be specially designed. The specific design details, complete drawings, and test data may not be released until 5 to 10 years later.
Now I have accumulated more than a hundred drawings, all of which can be used, each with its own advantages and disadvantages. The formal design requires a very deep understanding of the circuit and an extremely accurate grasp.
My actual test reached a distance of 120 meters, medium voltage transmission within a safe voltage range, and then adjusted at the end.
Nowadays, lines with telemetry of charging voltage and charging current are also used, which is a perfect way to charge each battery individually.
There are no related products on the market at all.
I have long-term experience charging electric bicycles from high-rise buildings to the places downstairs.
In order to ensure the life of the battery and ensure the safety of transmission, an ultra-low voltage drop charger must be used. I use both ultra-low voltage drop linear stability guarantee lines assembled with all discrete components and imported ultra-low voltage drop. Linear integrated circuits, also use switch modulated integrated circuits.
The problem you described is caused by the low design level of general electric bicycle chargers and the high pressure on cost constraints. For high-energy batteries, it is emphasized that the temperature rise of the battery must be continuously detected; for lead-acid batteries, their tolerance is much stronger. If the temperature rise of the lead-acid battery is too high when it is charged, it has been seriously overcharged.
It is very common that the charger cannot automatically turn on the light. The simplest method is to manually monitor and set the float charging voltage in a timely manner according to the actual situation; The obstacle is that charger manufacturers now keep the circuits secret. It takes several days to slowly and carefully interpret the assembly distribution of the circuits and redraw the circuit diagram using reverse engineering methods before formulating modification measures.
The greater difficulty is that the current charging method of connecting several rated voltage 12-volt batteries in series has serious flaws. After the battery has gone through dozens of charge and discharge cycles, the capacity and voltage of each battery will differ. It is getting bigger and bigger, even if manual intervention is needed to charge it, it will be of little help.
It is helpless, anxious, and unable to lend a helping hand.
The complete solution is to have a charger for each battery, and each battery has continuous monitoring. This kind of charger is not the current three-stage charger or the one promoted by the company. "computer intelligence" charger.
I have always wanted to fully disclose the relevant designs and a large amount of test data free of charge. You want Ye Qin, Hu Jun, and Jiang Shuzhuo to open the free teaching network, as well as the publishing houses they control.
What brand of electric vehicle charger has good quality? I want to be an agent in this area.
Let me tell you, no famous brand can achieve the following highest functions, performance and indicators in the country. ,
And those big brands are hugely profitable products! The selling price of their products, based on normal profit margins, can achieve the following effects. It has been proposed to a university technology service company that they are unable to realize its technological innovation and market potential, especially the creation of new market space.
Currently no production, no sales, frozen.
If you need it, you can contact us through the network administrator, and you may be able to authorize production. There is no direct and inevitable connection with economic interests, and there are no prerequisites. From a legal perspective, it can be considered free of charge.
The following is not a direct answer, it is a compilation of several other answers. You can slowly understand it.
If there are products with similar functions at home and abroad, you can criticize them again.
If you can’t find it, then criticize the big brand chargers,
Especially those that do not provide circuit diagrams, assembly diagrams, and are patch-mounted and cannot be repaired. Manufacturers that do not provide accessories, do not disclose test conditions and test results, do not disclose fault characteristics and repair methods, and electric bicycle chargers that cannot be adjusted or modified by users,
Electric vehicle charger power supply What's going on with the intermittent oscillation
It's usually an output short circuit! It is equivalent to the effect of burping. This is a safety protection measure designed by foreigners.
It depends on whether the voltage level is mismatched, whether the output current is small and the battery capacity is too large (this possibility is small, because the normal charger limits the maximum output current), and whether it is overloaded.
I made it for my own use and never for sale.
If you want to break the casserole and ask the question, I will give you a positive answer. The chargers you buy for 20 yuan each now are all garbage.
The chargers sold by big brands for 100 yuan each are all garbage. Huge profits, and these mass-produced SMD electronic products also work on high-voltage inverters, which are easy to be scrapped and cannot be repaired.
One with a traditional transformer sells for 100 yuan, which is very reliable, but the market does not accept it.
The one with a switching circuit inverter sells for 70 yuan to 50 yuan, which cannot be lower. Consumers can't understand it,
and the long-lasting battery saves investment. To take this path, you have to design and produce specialized integrated circuits. China does not have this ability in analog circuits and switching circuits.
In short, China is a society where a large number of manufacturing companies are already competing for price, and oligarchs sell products at high prices. These products are all electronic waste, have poor charging effects, and no one can make powerful and reliable products.