This is a battery charging project. Please give me your feedback on the project.
Thank you, Mr. Engineer, for your encouragement.
I love you so much my dear friend
Charges a 3.7 volt battery
Am i seeing what i think I’m seeing? Do not plug this into anyone’s laptop! What voltage did you set on the TL431 “Voltage Reference” to drive the Charging voltage? Where’s your USB protection, current limit, etc..
1 Like
I did this project a long time ago, dear engineer. I will review the plan and answer all your questions, dear engineer. Don’t worry, I will answer you, dear engineer.
I have done 35 projects, some of them are old and some are new. Don’t worry, dear engineer. I will provide you with the details.
I am busy now learning the 16-layer board.Or 32 layers. I am sorry now for the answer. Forgive me, Mr. Engineer.
Don’t worry, Mr. Engineer. It’s been a long time since I discussed my projects. I’m really happy to see you. No, really, Mr. Engineer.
I love you, Mr. Engineer. Thank you very much. I am putting forward my projects for discussion. I am very happy.
Hi, Mr. Engineer, discuss it among yourselves and come up with the project’s shortcomings. I am currently busy studying. Excuse me, Mr. Engineer. I promise you that I will talk about the electrical circuit in detail. My warm regards to you and your team.
The TL431 is a very popular and inexpensive three-terminal programmable voltage regulator. It is widely used in a variety of electronic applications, including regulated power supplies, comparators, and precision voltage references.
Key Features:
-
Programmable Output Voltage: The output voltage can be adjusted between 2.5V and 36V using external resistors.
-
High Accuracy: Provides high accuracy in the regulated output voltage.
-
Low Operating Current: It draws very low current, making it suitable for battery-powered applications.
-
Wide Temperature Range: It performs well over a wide range of temperatures.
-
Inexpensive and Widely Available: It is easy to obtain and inexpensive.
TL431 Terminals:
-
Cathode Terminal: The positive terminal of the output.
-
Anode Terminal: The negative terminal of the output and is connected to ground.
-
Reference Terminal: Used to set the desired output voltage. A voltage divider is connected between the cathode terminal and ground, and the midpoint is connected to the reference terminal.
How does the TL431 work?
The TL431 acts as a very precise comparator. It compares the voltage on the reference terminal to a fixed internal voltage of approximately 2.5 volts. When the voltage on the reference terminal exceeds 2.5 volts, the TL431 begins to conduct current between the cathode and anode, lowering the output voltage. Using external resistors to form a voltage divider, the desired output voltage can be adjusted.
TL431 Applications:
-
Regulated Power Supplies: Used to regulate the output voltage in linear and switching power supplies.
-
Comparators: Can be used as a precision comparator to compare two voltages.
-
Overvoltage Protection: Used to detect overvoltage conditions and protect sensitive circuits.
-
Undervoltage Protection: Used to detect undervoltage conditions and take appropriate action. - LED indicators: Used to turn LEDs on and off when a certain voltage is reached.
-
Current control circuits: Can be used to control the current flowing through a circuit.
A simple example of voltage regulation using the TL431:
Let’s assume we want to regulate the output voltage to 5 volts. We can use the following circuit:
-
A resistor (R1) is connected between the cathode terminal and the voltage source.
-
Two resistors (R2 and R3) form a voltage divider. R2 is connected between the cathode and the reference terminal, and R3 is connected between the reference terminal and ground.
-
The anode terminal is connected to ground.
To calculate the resistor values, we use the following formula:
Vout = Vref * (1 + R2/R3)
Where:
- Vout is the desired output voltage (5 volts).
- Vref is the internal reference voltage (2.5 volts).
The value of R3 can be chosen (for example, 1 kΩ) and then the value of R2 can be calculated using the formula.
Important Notes:
-
The resistor values must be chosen correctly to ensure circuit stability.
-
Ensure that the input voltage falls within the TL431’s permissible operating range.
-
The TL431 datasheet can be consulted for detailed information on electrical characteristics and applications.
In short, the TL431 is a versatile and inexpensive voltage regulator, making it a popular choice for many electronic applications.
@sikwal
For verification, Would you have a link to the specific “TL431” you are using?
1 Like
Dear Engineer, the electrical circuit you made is 100% correct. I made the project on 2012 /12/01. I applied it to the TL431 2.5 volt regulator, and it is a correct application. Dear Engineer, would you like to have coffee with me? Dear Engineer, I hope to see you face to face. I do not have I had electrical programs, but my children messed with them and the programs were lost. But I promise you, the circle is in reality, my dear.a link. I have programs that use lt431.
Dear friends, I enjoy discussing with you. It has been a long time since I discussed my projects. My warmest regards to you, my dear ones.My kids messed with my computer and lost power programs including Proteus. I have tested the electrical circuit before, but unfortunately now the electrical programs Proteus do not comply. They are all gone to waste. I will try to collect them again.
Do you want to ask me, Mr. Engineer? I am going to sleep so that I can go to school with my children.
Hi, I am sorry, sir engineer, if my answer is incomplete. I am currently studying PCB board design. My warmest regards to you, Sikwal.
Hi, Mr. Engineer, I cannot put forward a new project topic for discussion because I am busy studying. Thank you, Mr. Engineer, for putting forward two topics for discussion.
Hi do you sell digikey MPLAB PLCKit 5 please give me the link