Light emitting diode (LED) driving power supply having current-limiting protection

Abstract

The invention discloses a light emitting diode (LED) driving power supply having current-limiting protection. The LED driving power supply comprises an input protection circuit, a buck circuit, a rectification filter circuit and a voltage-division current-limiting resistor which are electrically connected, wherein the voltage-division current-limiting resistor is used for current-limiting protection on an LED so that the LED works under the driving of stable voltage and current, a filter capacitor in the rectification filter circuit is a tantalum electrolytic capacitor, and in the same conditions of voltage resistance and capacitance, the filter capacitor is relatively small in size and stable in performance, favorable electrical performance still can be maintained after the filter capacitor works for a long time, and the service lifetime of the LED driving power supply can be prolonged; a chip resistor is arranged in the filter capacitor and is used for discharging, and when the power supply is cut off, the chip resistor can discharge electricity stored in a capacitor core within a very short time, the voltage of the capacitor core is reduced to zero, so that a bleeder resistor is not needed to be connected in parallel to the two ends of the filter capacitor; and a shell of the filter capacitor adopts an epoxy resin shell formed by encapsulating epoxy resin outside a capacitor component, and the LED driving power supply has an effect or electric leakage prevention and is more safer.

Description

technical field [0001] The invention relates to the field of LED driving, in particular to an LED driving power supply with current limiting protection. Background technique [0002] LED lighting is a new type of light source that has developed rapidly in recent years, and its many good features make it more and more widely used. LED is a kind of electric light source with extremely long service life, and its service life can reach 100,000 hours. However, in practical applications, the actual service life of LED lights is not high, and some even break down in less than a year. This is due to the unidirectional conductivity of the LED, so that the LED must be equipped with an LED driving circuit to work, and the reliability of the LED driving circuit is not high, and the driving performance is not good. In the LED driving circuit, especially when the AC mains is driving the LED lamp, the LED driving circuit must have an input rectification filter circuit and an output rectif...

AI Technical Summary

Problems solved by technology

Compared with semiconductor devices and passive components with a lifespan of 100,000 hours and semi-permanent life, aluminum electrolytic capacitors are key components that cause the life of LED drive circuits to fail to meet the requirements

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