The use of supercapacitors in LED power supplies

Infineon / Mitsubishi / Fuji / Semikron / Eupec / IXYS

The use of supercapacitors in LED power supplies

Posted Date: 2024-02-04

The use of supercapacitors in LED power supplies

With the increasing awareness of energy conservation and the improvement of environmental protection requirements, LED lamps are increasingly used in the lighting field. In LED lamps, the design and material selection of the power supply are very important, and supercapacitors, as an emerging energy storage component, are widely used in LED power supplies.

1. Principles and characteristics of supercapacitors

1. Principle

Supercapacitors are also called electrochemical capacitors or battery supercapacitors. It uses the principle of electrochemistry to store electrical energy in a double-layer charge band where the charge is distributed on an all-solid dielectric. Supercapacitors are more similar to batteries than traditional capacitors, capable of storing electrical energy in units of current and releasing it when needed.

2. Features

(1) High energy density: Supercapacitors have high energy density and can achieve a certain degree of energy storage effect.

(2) Long cycle life: The service life of supercapacitors is much longer than that of traditional batteries and can undergo millions of charge and discharge cycles without damage.

(3) Fast charging and discharging: Supercapacitors have very fast charging and discharging speeds, millisecond-level response times, and can release a large amount of electrical energy in a short period of time.

(4) Wide temperature range: Supercapacitors can operate normally in a wide range of temperatures and are suitable for various environmental conditions.

(5) Environmentally friendly and reliable: Supercapacitors emit no pollutants and are more environmentally friendly and reliable than traditional batteries.

2. Application of supercapacitors in LED power supplies

1. Combined battery use

The combined use of supercapacitors and batteries can effectively solve the transient power requirements of LED power supplies. Since LED lamps will generate a large current impact when they are turned on, the output current of traditional batteries is not enough to meet the demand. At this time, supercapacitors can be used as auxiliary power supplies to provide high current output in a short period of time to ensure the normal operation of LEDs.

2. Transient current balance

In the use of LED lamps, when the power supply voltage changes transiently, the transient current of the LED lamp will also change. Supercapacitors can serve as transient current balancers for power supplies, responsible for absorbing or releasing current to maintain the stable operation of LED lamps.

3. Transient power backup

Supercapacitors can be used as backup power supplies for LED power supplies. When the main power supply fails instantaneously or has a power outage, supercapacitors can quickly release stored power to provide continuous power support for LEDs and ensure uninterrupted operation of the lighting system.

4. Energy saving feedback

Supercapacitors can use the reverse current generated when LED lamps are working to provide feedback and realize energy recovery and reuse. By giving back, not only can energy waste be reduced, but the service life of supercapacitors can also be extended.

3. Advantages of supercapacitors in LED power supplies

1. Enhance power supply stability

The fast response characteristics of supercapacitors can effectively balance the difference between power input and output, ensuring the stable operation of LED lamps. When the power supply voltage is unstable or has transient fluctuations, supercapacitors can respond quickly, absorb or release current, and reduce the impact of power supply fluctuations on LEDs.

2. Improve LED startup speed

Supercapacitors have the characteristics of rapid charge and discharge, which can provide the transient power required for rapid startup of LED lamps. By using supercapacitors, the start-up time of LED lamps can be greatly shortened, improving the user experience.

3. Increase LED service life

As an auxiliary power supply, supercapacitors can reduce the frequency of battery use and extend the service life of LED power supplies. At the same time, the high cycle life of supercapacitors can ensure long-term stable power supply and reduce damage to LED lamps caused by power failure.

4. Practical application cases of supercapacitors in LED power supplies

1. Indoor lighting system

In indoor lighting systems, supercapacitors can be used as auxiliary energy storage components for batteries, reducing battery usage frequency and extending battery life. When the battery power is low, the supercapacitor can respond quickly to provide transient power to the LED lamps to ensure the stable operation of the lighting system.

2. Vehicle lighting system

In vehicle lighting systems, supercapacitors can be used as backup power sources. When a vehicle power failure occurs, the stored electrical energy can be quickly released to provide lighting support for the vehicle and ensure driving safety.

3. Solar lighting system

In solar lighting systems, supercapacitors can use the electrical energy generated by solar panels to store it and release it as needed to supply energy to LED lamps. By utilizing supercapacitors, dependence on the grid can be reduced and the self-sufficiency of solar lighting systems increased.

in conclusion:

As an emerging energy storage component, supercapacitors are of great significance in their application in LED power supplies. It can enhance power supply stability, increase LED startup speed, and extend LED service life. In fact, supercapacitors have been widely used in indoor lighting systems, vehicle lighting systems and solar lighting systems. With the continuous development and innovation of technology, it is believed that the application prospects of supercapacitors in LED power supplies will be broader.

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