Led lamp capacitor energy storage delay extinguishing

Can al-cap capacitor lifetime be predicted in LED drivers?

A quantitative comparison of the estimated lifetime of Al-Cap in the LED driver is given with and without the consideration of capacitor parameter shifts within the service life. The proposed method enables a more realistic way for electrolytic capacitor lifetime prediction in LED drivers, which would otherwise have the risk of overestimation. 1.

Why are electrolytic capacitors important?

In the lighting-emitting diode (LED) luminaire system, electrolytic capacitors are regarded as the critical components that may result in a significant lifetime mismatch between the LED driver (e.g., 10,000 h) and the LEDs being driven (25,000–100,000 h) .

Do electrolytic capacitor parameter shifts affect led driver performance?

A realistic lifetime prediction of Al-Caps would be beneficial to the sizing of capacitors to fulfill a specified design lifetime. This paper investigates the impact of electrolytic capacitor parameter shifts on the LED driver performance and the capacitor reliability.

What is a realistic lifetime prediction for electrolytic capacitors?

The electrolytic capacitor (Al-Cap) is widely considered as one of the reliability-critical components in LED driver applications. A realistic lifetime prediction of Al-Caps would be beneficial to the sizing of capacitors to fulfill a specified design lifetime.

Why do LED drivers use Al-caps?

Al-Caps are commonly used as energy storage and buffers at the output end of drivers. The parameter shifts of capacitance and ESR caused by the mentioned factors can alter the electrical and thermal performance of a LED driver. 3.1.

How long does a B1 capacitor last?

The mean value of obtained B1 lifetime is 1729 days, which is about 30% shorter than the one without considering parameter shifts. The proposed method provides an opportunity to predict the capacitor lifetime in LED driver applications in a more realistic way.