Intelligent digital control circuit for low ripple LED drive power without electrolytic capacitor

Abstract

The invention provides an intelligent digital control circuit of a no-electrolytic-capacitor low-ripple LED driving power supply. The intelligent digital control circuit comprises a full-wave voltage-doubling rectification input circuit, a high-frequency oscillation circuit, an MCU, an electric signal sampling circuit, a magnetic core column, a ripple suppression circuit and a full-wave voltage-doubling rectification output circuit. The full-wave voltage-doubling rectification input circuit is electrically connected with the high-frequency oscillation circuit. The signal output end of the MCU is electrically connected with the control end of the switching circuit of the high-frequency oscillation circuit. The electric signal sampling circuit is electrically connected with the MCU. The electric signal sampling circuit provides electric energy and sampling signals to the MCU. The MCU controls switching frequency of the switching circuit according to the sampling circuit. The ripple suppression circuit and the full-wave voltage-doubling rectification output circuit transmit electric signals after rectification and filtering to a load LED lamp. No electrolytic capacitor is adopted so that the service life of the intelligent digital control circuit is increased and the service life of the intelligent digital control circuit is enabled to be matched with the service life of the load LED lamp. The intelligent digital control circuit has advantages of being high in electrical efficiency, low in current ripple and long in the service life, and reliability is enhanced due to no use of the electrolytic capacitor.

Description

technical field [0001] The invention relates to the technical field of LED driving power, in particular to an intelligent digital control circuit of an electrolytic capacitor and low-ripple LED driving power. Background technique [0002] On April 3, 2014, CREE announced a new record of 303 lumens per watt for LED high light efficiency. China's "Gaogong LED" reported on page 32 in October 2014 that China Wanbang Optoelectronics' independent intellectual property rights closed mode innovation of LED light sources with more than 280 lumens per watt. In the struggle of many companies around the world, the light efficiency of LED is increasing by about 10% year by year, surpassing the existing known light sources. However, since LEDs have a lifespan of tens of thousands of hours, the market urgently needs a long-life, high-reliability LED driver power supply that is compatible with LEDs. [0003] In the prior art, the reason why the existing LED drive power supply cannot work ...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, some of the reasons why the existing LED drive power supply cannot work normally are caused by the damage of the power electronic switch, such as over-current damage and over-voltage damage.

Another part is that the existing LED drive power uses a large-capacity electrolytic capacitor. Although the large-capacity electrolytic capacitor can stabilize the LED current ripple, the electrolytic capacitor is prone to explosion or failure.

Moreover, the larger the electrolytic capacitor used, the more dangerous the LED drive power supply, the shorter the service life of the LED drive power supply, and the existing LED drive power supply also has problems such as low electrical efficiency and unsatisfactory reliability.

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