Electrolytic capacitor flyback ac/dc converter for led lighting

Abstract

The invention discloses an electrolytic capacitor-free flyback alternating current (AC) / direct current (DC) converter for illumination of a light emitting diode (LED). According to the converter, a segmentation harmonic compensator is connected with an anti-phase end of an operational amplifier; a voltage control oscillator of which the oscillation frequency is reduced along with the rise of input voltage is connected with an in-phase end of the operational amplifier; an output end of the operational amplifier is connected with an input end R of an RS trigger; the voltage control oscillator of which the oscillation frequency is reduced along with the rise of the input voltage is connected with an input end S of the RS trigger; and an output end of the RS trigger is connected with a drive circuit. By the converter, stable constant-current output of an output stage can be realized only by using a tantalum capacitor or a ceramic capacitor from several microfarads to dozens of microfarads under the condition that an input high-voltage electrolytic capacitor is not used, and ripple waves of an output circuit are about 10 percent, so that the service life of the whole LED illuminating lamp is prolonged.

Description

technical field [0001] The invention relates to a device for light-emitting diode LED lighting, in particular to an analog-to-digital AC / DC converter for light-emitting diode LED lighting. Background technique [0002] At present, the service life of LED light-emitting diodes can reach 100,000 hours, while the service life of most existing LED lighting products is far less than 100,000 hours and only a few thousand hours. The reason is that the electrolytic capacitors in the power drive module in the LED lighting lamp have insufficient lifespan. The service life of electrolytic capacitors is greatly affected by the ambient temperature, and the service life is approximately halved when the ambient temperature increases by 10 degrees. However, the high ambient temperature of the LED lighting lamp during operation reduces the service life of the electrolytic capacitors in the driving module thereof, thereby affecting the service life of the entire LED lighting lamp. Therefore...

AI Technical Summary

Problems solved by technology

The reason is that the life of the electrolytic capacitor in the power drive module of the LED lighting lamp is insufficient

The service life of electrolytic capacitors is greatly affected by the ambient temperature, and the service life will be reduced by about half if the ambient temperature rises by 10 degrees.

However, the high ambient temperature of the LED lighting lamp at work reduces the life of the electrolytic capacitor in its drive module, which affects the service life of the entire LED lighting lamp.

Images