2024-10-10
Why should led lights add resistance
Why should led lights add resistance?
LED lamp plus resistance is mainly to limit the current, to protect the lamp beads from being burned by too high current . LED lamp beads have a working voltage range, if beyond this range, the current will be too large, may lead to LED lamp bead damage. By connecting a resistor in series, the size of the current can be limited to ensure that the LED lamp bead works within the safe voltage and current range .
In addition, if the product of the voltage and the current at the intersection of the LED characteristic curve is greater than the power that the diode can withstand, a resistor 2 is also required. However, if the power supply is constant current, you can not use the resistor .
In short, the resistance plays a very important role in the LED lamp circuit, which can not only protect the LED lamp beads, but also ensure the stable operation of the LED lamp beads. Therefore, when designing and using LED lamp circuits, reasonable selection and configuration of resistance is crucial .
In addition, if the product of the voltage and the current at the intersection of the LED characteristic curve is greater than the power that the diode can withstand, a resistor 2 is also required. However, if the power supply is constant current, you can not use the resistor .
In short, the resistance plays a very important role in the LED lamp circuit, which can not only protect the LED lamp beads, but also ensure the stable operation of the LED lamp beads. Therefore, when designing and using LED lamp circuits, reasonable selection and configuration of resistance is crucial .
What is the role of resistance in the LED lamp circuit?
- 1. Current limiting : protect the LED lamp beads from being burned by too high current, and ensure that the LED lamp beads work within the safe voltage and current range .
- 2. Voltage divider : when multiple resistors are in series, each resistor will share a part of the voltage, so that the voltage in the whole circuit is dispersed, and the effect of voltage divider .
- 3. Increase circuit stability : the resistance has a certain heat capacity, which can absorb abnormal fluctuation energy in the circuit and make the circuit more stable .
In summary, the resistance not only plays the role of current limiting and voltage dividing in the LED lamp circuit, but also increases the stability of the circuit and protects the normal operation of the LED lamp bead and the entire circuit .
How to choose the right resistance to protect LED lamp beads?
- Determine LED parameters :
First understand the rated working voltage and current of the LED lamp bead.
- Calculate resistance :
Use Ohm's law (V=IR) to calculate the required resistance value.Resistance value = (power supply voltage - LED forward voltage)/LED rated current.
- Consider the resistance power :
The power of the resistor must be greater than the product of voltage and current to prevent overheating.Select a resistor with a power slightly greater than the calculated value.
- Select the resistor type :
Patch resistors are often used with LED beads and are easy to integrate on the circuit board.
- Ensure resistance accuracy and reliability :
Select resistance with high precision and good reliability to ensure the stability of the circuit and the safety of the LED lamp beads
What are the advantages of the patch resistor?
1. Small size, light weight : the SMT resistance is mounted on the surface, saving space, making the circuit more compact, and easy to store and transport .
2. High precision and good stability : the precision of the chip resistance can reach 0.01%, etc., to ensure the stability and reliability of the circuit, and stable performance in a variety of harsh environments .
3. Good heat dissipation : the patch resistance is small, the heat dissipation area is relatively large, the heat dissipation performance is good, suitable for high-power circuit .
4. Easy installation and maintenance : the patch resistance can be directly welded to the surface of the circuit board, convenient replacement, and suitable for reflow welding and wave soldering .
5. Superior high frequency characteristics : the structure and material of the chip resistance make it have good high frequency characteristics, which is suitable for high frequency circuit.
2. High precision and good stability : the precision of the chip resistance can reach 0.01%, etc., to ensure the stability and reliability of the circuit, and stable performance in a variety of harsh environments .
3. Good heat dissipation : the patch resistance is small, the heat dissipation area is relatively large, the heat dissipation performance is good, suitable for high-power circuit .
4. Easy installation and maintenance : the patch resistance can be directly welded to the surface of the circuit board, convenient replacement, and suitable for reflow welding and wave soldering .
5. Superior high frequency characteristics : the structure and material of the chip resistance make it have good high frequency characteristics, which is suitable for high frequency circuit.
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