According to various safety requirements,
22V AC power supply lines should not be hung outside the wall.
Even low-voltage lines,
suspended from high-rise buildings,
the cross-sectional area of wires of network cables and ordinary telephone lines is too small and the strength is poor.
Such wires themselves cannot bear such weight and tension.
hanging from a high-rise building to charge an electric bicycle on the first floor or basement,
it can only be an extended low-voltage conductor,
and the charging current is generally 2 amps,
there is a certain limit to the total resistance of the extended conductor,
especially for lead-acid batteries,
the charger corresponds to different charging currents, and the output voltage of the charger is different, < p
Because the initial charging current is too small,
the charger regards the battery as fully charged,
it starts with a green light,
charges with a low voltage and a small current,
as a result, the lead-acid battery is continuously charged for several days, and
it is not fully charged.
even if it is charged with red light, high voltage and high current at first, it will only turn to green light soon after the red light comes on.
for lithium batteries, it is still allowed to charge with slender wires, but the charging time is long.
in your environment,
you have to use a medium-grade medium voltage to supply power between your high-rise residence and the first floor,
that is, use a lead-acid battery charger with a rated voltage of 48V to transmit power between your high-rise residence and the first floor.
On the first floor,
there is a DC power supply that allows the input voltage of 2V to 6V to be converted into DC power supply.
This switching power supply has two charging states, namely red light and green light, which are usually required by lead-acid batteries,
a specified output voltage value and a specified output current range.
I have made it more perfect.
For four lead-acid battery cells,
there is a completely independent switching power supply with a rated output voltage of 12 V.
Each battery cell is charged independently.
When the red light is red, the maximum output voltage of this charger is 14.8V, and the charging current is limited to less than 2.A；;
when the light is green, the output voltage is stabilized at 13.5V, and the charging current is limited to less than 2.A ..
there are four such switching power supplies, all of which accept an input power supply voltage of 2V to 6V.
In fact, the allowable range of input power under the guaranteed output power of these switching power supplies is 22V to 15V V.
The resistance of each switching power supply and the startup chip is automatically and completely disconnected after the startup is completed.
The power consumption of this disconnection operation is less than 1mW, which is the level of micro-power consumption in the real international aerospace field.
and, more than 2 years ago,
I realized long-distance bidirectional transmission in this 2-wire system.
With the above engineering and technical support,
ordinary network cable or
ordinary telephone line can be used for long-distance charging.
At present, the diameter of copper core of telephone lines and network cables is generally .4 mm, and there are many network cables, including 4 copper cores and 4 iron cores.
especially good network cable and telephone line, the diameter of copper core is .6 mm.
Generally speaking, for the extended low-voltage output line of lead-acid battery,
the total voltage drop of the line should be within 2V (the rated battery voltage is 48V, and if the rated battery voltage is lower than 48V, the total voltage drop of the line will be reduced).
Measure and calculate the specific longest line resistance and voltage drop yourself.
How to charge the electric bicycle without pulling the charging line from the high-rise residence to the first floor, and there is no AC power supply from the grid on the first floor?
During the day, charge the intermediate transition battery in the small house,
At night, charge the battery on the electric bicycle with the intermediate transition battery in the small house.
hee hee,
a world-class idea! ! ! !
what are the rewards?
Your question is:
You can put your electric bike in the small storage room on the first floor of the house at night,
However, you can't pull wires from your high-rise residence to this small storage room to charge your electric bike.
Because there is no elevator in this house,
You don't want to remove the heavy battery from the electric bicycle,
You have to work hard to move it upstairs to charge it.
A more advanced method is to use high-power density electric energy storage devices,
transport them from high-rise residential buildings,
transport the first-floor electric bicycles,
charge the batteries of electric bicycles,
which requires a high-performance switching power supply.
To be precise,
means charging each independent battery unit with a rated power supply voltage of 12V.
In this way,
several completely independent chargers are needed,
which is absolutely balanced! ! !
The most advanced charging method,
If it is the same for lithium batteries,
3.7V or 4.2V is an independent charger.
is the educational system in our country a laggard?
each country has its own environment and cultural traditions, and it cannot be generalized. The teaching materials and courseware of Massachusetts Institute of Technology are published online for free, and Chinese all over the world are also obliged to translate. Anyone can learn, and there are many people who can pass the exam. How many countries can be like him?
I used to go deep into students' dormitories to guide students to learn analog circuits for free, and bought components, materials, liquid crystal display panels and computers at my own expense to give them experiments, to help them build mathematical models and to guide them to write invention patent documents for free.
Guide them to solve common experimental problems by themselves on the spot. Even for students with decent families, they have provided non-repayable cash support.
If students are really interested in this business, what do they want to know, what doubts they have and what problems they can't solve, just ask me. As long as I know and have personal experience, I know everything and say everything, and I will answer them immediately without reservation.
I've always wanted to open a free video website to guide students all over the country for free. The school strictly forbids me to use computers, oscilloscopes and servers, and there is no working space at all.
Therefore, Hu Jiangjunshu was offended, and
After being forced to leave the post, he persisted.
How to do the wholesale business in electric car charger
Make sure to provide the circuit diagram free of charge, make the design drawings completely public, introduce the purchase place of all spare parts thoroughly, and explain the test method of maintenance failure in detail sincerely! You will monopolize the national market!
the conductor with a copper wire diameter of 1.2 mm and a conductor section of 1 square mm has a resistance of 1.5 ohms in 1 meters, and the total resistance of 5 meters connected by two strands is 1.5 ohms.
the resistance of the conductor with a copper wire diameter of 1.6mm and a conductor cross section of 2mm is .8 ohm in 1m, and the total resistance of the conductor with 5 meters connected by two strands is .8 ohm.
for 8-core network wires, the copper cores are thick and thin, and some have 4 copper-plated iron core wires. Even if the diameter of each copper core is .3mm, the cross-sectional area of the conductor is .7548m2, and the resistance of 1m is 23 ohms, four wires are connected in parallel to form one strand, and the total resistance of 5m is 5.8 ohms. Connect 1 meters with a total resistance of 1.16 ohms.
It depends on what kind of charger, whether it has a fixed output voltage or a three-stage intelligent charger.
For a charger with a fixed output voltage, the DC resistance at the output side can be larger, that is, within 1 ohm, up to 5 ohms.
For the three-stage type, the DC resistance of the lead is smaller.
If the lead is longer, it will not be enough even if the battery is charged for more than 1 hours.
For the specially designed charger, the medium-voltage power supply can be used to charge the electric vehicle 1 meters away, and the conductor resistance can be 1 ohms. However, with the small-section conductor, each 12V battery can be charged separately, and the charging voltage can be automatically reduced after charging, so that the charging state of each battery can be telemetered.
this is kung fu.
kneel for the circuit diagram of 24V3A charger
there are many such products on sale now.
you need to customize a high-power transformer yourself. 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 drawing more heads between the secondary 24 volts and 33 volts.
The simple method is to rectify the secondary output with full wave and directly output it to the battery. The ammeter should be connected in series and the voltmeter should be connected in parallel. The output voltage and current should be manually adjusted by the switch of industrial appliances (which is abundant in Zhejiang Province), and it should be adjusted according to the charging process. As for the charger with automatic voltage stabilization and automatic current stabilization, 35 years ago, the control mode information of SCR was published and printed. The simple emergency method is to use a walking lamp transformer (36V safe voltage output), an isolation transformer and an electric welding machine transformer with sufficient power to make several turns on its secondary stage, and connect it in series in the forward direction or in the reverse direction, so as to adjust the output voltage and charging current to a suitable range.
The electric bicycle just got a new battery, but the charger light was still red after being charged all night last night. Is it the battery problem or the charger problem?
I just got a new battery yesterday, and the charger light was still red after being charged all night last night. Is it the battery or the charger?
My old battery used to be red no matter how long it was charged, and the battery was very hot, so I changed the battery, but now the charger still doesn't turn green.
The original battery was 1A, but now it's 12A. The charger is 1.8A, which can charge the 12A battery?
Supplement to the question:
My battery was changed only after it was severely deformed, and it was charged for 12 hours every day.
There are two aspects to be discussed.
First, use a voltmeter to measure the output voltage of the charger when the battery is not connected, and then
measure the charging voltage and charging current after charging for more than ten hours.
You'd better buy an ordinary pointer-type three-purpose meter yourself, and usually connect it to both sides of the charger's output terminal to measure the voltage, and always pay attention to the change of its voltage. I bought a universal, single-purpose pointer voltmeter in parallel with the charger to continuously observe the changing process of charging voltage. As for the normal range of charging voltage, there are many pages on the internet that are full of articles. Please search for them yourself.
the above work is to judge whether the output voltage of the charger is out of control.
Because Jiang Hu Shu Jun Zhuo forced me to be laid off, the following is a brief introduction;
even the chargers that meet the factory standards of domestic factories, even the three-stage smart chargers and the computer-controlled chargers are all charged by connecting several batteries in series. After several cycles of charging and discharging, the voltage and capacity of each battery will become more and more different, and the usual fault phenomenon is that some of them swell. If the old and new batteries are used together, the probability of this kind of failure is higher and more frequent.
therefore, if possible, we should take a separate charger for each battery. This is a comprehensive consideration for charging the battery of the electric bicycle downstairs from the high-rise residence!
in particular, the charging process of each battery is remotely controlled and measured separately.
I have long-term experience here. For example, there is a universal charger upstairs, and there is also an ultra-low voltage drop-off charging controller built with discrete components on the electric bicycle.
You should ask those top candidates in the college entrance examination, graduate students in integrated circuit design and doctoral tutors to solve your practical needs. Their monthly salary starts at more than RMB 1,, and I am a place to receive social relief.
The high-rise building is designed to charge the storage battery downstairs and remotely.
Medium voltage and low voltage power transmission are adopted, and the ultra-low voltage drop-off circuit, remote control and telemetry circuit are built by completely separated components.
Single chip microcomputer is not used as far as possible to reflect the high-quality design ability, and realize time sequence control, automatic adjustment of charging voltage and automatic adjustment of charging current.
the charger of 48V1.8A for electric vehicles can be used with 48V2.5A or 48V3A after extending the output end by 3 meters?
because we live on the fifth floor and the electric car is on the first floor, it is very inconvenient to charge.
if the original charger is used, the battery is often not fully charged after extending the output terminal of the charger (it is not very safe to extend the 22V terminal)!
this is a specially designed charger.
one of my ways is to increase the output voltage of the existing charger, and there is another coordination circuit on the bicycle. Because there is actually a requirement for step-down at the end of charging, the perfect circuit should be specially designed, and the specific design details and complete drawings and test data may not be announced until 5 to 1 years later.
At present, more than 1 drawings have been accumulated, all of which can be used, each with its own advantages and disadvantages. Its formal design should be very profound and accurate in understanding the circuit.
my actual test has reached a distance of 12 meters, and the medium voltage transmission within the scope of safe voltage, and the terminal will be adjusted again.
At present, lines with telemetering charging voltage and charging current are also used, which is a perfect way to charge each battery separately.
there are no related products in the market at all.
I have been charging electric bicycles downstairs from high-rise buildings for a long time, and I have rich experience.
in order to ensure the battery life and transmission safety, we need to use the ultra-low voltage drop charger. I use the ultra-low voltage drop linear stability guarantee circuit assembled by fully discrete components, the imported ultra-low voltage drop linear integrated circuit and the switch modulation integrated circuit.
The problem you have described is caused by the low design level of general electric bicycle chargers and the great pressure on cost limitation. For high-energy batteries, it is emphasized to continuously detect the battery temperature rise; For lead-acid battery, its tolerance is much stronger. If the temperature rise of lead-acid battery is too high when it is charged, it is very serious to have been overcharged.
It is very common that the charger can't jump the lamp automatically. The simplest method is * * * *, manual monitoring, and timely * * * * * floating charging voltage according to the actual situation; The obstacle is that the charger manufacturers are now keeping the lines secret, and it will take several days to read the assembly distribution of the lines slowly and carefully, and then redraw the circuit diagram by reverse engineering before making modification measures.
The greater difficulty is that the current method of charging several batteries with rated voltage of 12 volts in series has serious defects. After dozens of cycles of charging and discharging, the capacity and voltage of each battery are increasingly different. Even if manual intervention in charging is carried out, it is a drop in the bucket,
it is useless, anxious and unable to help.
The complete solution is to have a charger for each battery, and each battery has * * * * * * continuous monitoring. This charger is not the current three-stage charger or the "computer intelligence" charger advertised by enterprises.
I've always wanted to fully disclose the relevant design and a large number of test data for free. You want Ye 87 Qin, Hu 87 Jun and Jiang 87 Shu 78878 Zhuo to open a free teaching network, as well as the publishing houses they are in charge of.
What brand of electric car charger is of good quality? I want to be an agent in this respect.
Let me tell you, none of the famous brands can reach the following national highest functions, performance and indicators.
And those big brands are profiteering.