5v lamp bead how to connect 48v 3.3v lamp bead connect 5v

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In electronic circuits, connections between elements of different voltages are often involved. For example, how the LED beads of 5V plug into the circuit of 48V, or how the LED beads of 3.3V connect into the circuit of 5V. These problems are very common for electronic engineers and electronic enthusiasts. This paper will discuss these problems in detail from both theoretical and practical aspects, to help readers to better understand and solve these problems.

Basic principle of the LED lamp beads

LED lamp bead is a semiconductor device with light emitting function. It works by releasing energy and generating light through the recombination of electrons and holes. The voltage and current of LED beads are the key parameters, and different beads have different rated voltage and current. When accessing the circuit, the rated voltage and current of the lamp bead, as well as the voltage and current of the circuit.

The voltage of the LED lamp beads is usually a range, such as 3V-3.2V,5V-5.2V and so on. In practical application, we need to choose the appropriate voltage according to the specific situation. If the voltage is too high, the bead will burn; if the voltage is too low, the bead cannot shine normally.

How the LED beads of 5V plug into the circuit of 48V

If you want to connect 5V LED beads to a 48V circuit, use a current limiting resistance. Current-limiting resistance can limit the size of the current to protect the LED lamp beads. The specific connection method is as follows:

1. Calculate the resistance value of the current-limiting resistance

According to Ohm's law, the current I=U / R, where U is the voltage and R is the resistance. Let the LED beads have a rated voltage of 5V, a rated current of 20 mA and a circuit voltage of 48V. The resistance value of the current-limiting resistance is:

R=(48V-5V)/20mA=2.15kΩ

2. Select the appropriate current-limiting resistance

According to the calculation results, choose 2.2 kΩ or 2.0 kΩ resistance. Usually, a smaller resistance can be selected to ensure a high brightness of the LED beads.

3. Connect LED beads and current limiting resistance

Connect the positive electrode of the LED bead to one end of the current limiting resistance and connect the negative electrode of the LED bead to the other end of the current limiting resistance. Connect the current-limiting resistance to the circuit.

3.3V LED beads into the 5V circuit

If you want to connect the 3.3V LED beads to the 5V circuit, you can connect directly, without using the current limiting resistance. Because the rated voltage of 3.3V LED beads is low, the circuit voltage will not exceed the voltage of 5V. 

The specific connection method is as follows:

Connect the positive electrode of the LED bead to the positive electrode of the circuit, and connect the negative electrode of the LED bead to the negative electrode of the circuit. If multiple LED lamp beads are required, they can be connected together and then connected to the circuit.

Series and parallel connection of the LED lamp beads

In practice, LED lamp beads often need to be connected in series or in parallel. Series and parallel mode can affect the voltage and current of the circuit, so it needs to be selected according to the specific situation.

When multiple LED beads are connected in series, their voltage increases and the current remains constant. Therefore, the appropriate current-limiting resistance is selected to protect the LED lamp beads. For example, if there are three 5V LED lamp beads that need to be connected in series, a 15V power supply can be selected, and three 2.2 kΩ current-limiting resistors can be used.

When multiple LED beads are connected in parallel, their current increases and the voltage remains unchanged. Therefore, it is necessary to ensure that the current of each LED bead is the same to avoid uneven brightness. For example, if there are three 5V LED beads to be connected in parallel, select 5V power supplies and use three 68 Ω current limiting resistors.

Heat dissipation of the LED lamp beads

LED lamp beads will generate heat when working, which will need to dissipate heat. Otherwise, the lamp bead will be damaged due to overheating. When designing the electric circuit, we need to consider the heat dissipation problem of the lamp beads.

Common LED lamp bead heat dissipation mode includes: metal heat sink, heat dissipation glue, fan heat dissipation and so on. Choose the appropriate heat dissipation mode, which can effectively prolong the life of the LED lamp beads.

Selection of the LED lamp beads

The selection of LED lamp beads needs to consider many factors, including: brightness, color temperature, color, voltage, current and so on. Different application scenarios need to choose different LED lamp beads.

When selecting LED lamp beads, you need to understand their parameters, such as: rated voltage, rated current, brightness, color temperature, and so on. These parameters can be understood through the data manual provided by the manufacturer, and be selected according to the specific situation。

The above is for "5v bead how to connect 48v 3.3v bead 5v" detailed introduction how do you think? For more, check out the recommendations below, which is a summary of this article

In electronic circuits, the connection of LED lamp beads is a common problem. In this paper, the basic principle of LED beads, how 5V LED beads connected to 48V circuit, how 3.3V LED beads connected to 5V circuit, series and parallel of LED beads, heat dissipation of LED beads, the selection of LED beads and the selection of LED beads are elaborated. I hope this article can be helpful to readers to better understand and solve these problems