Power circuit for light emitting diode (LED) illuminating lamp

Abstract

The invention relates to a power circuit for a light emitting diode (LED) illuminating lamp. The power circuit is a conversion circuit converting mains supply into direct current ripple voltage with ripple frequency between 100Hz and 200Hz. As the power circuit for the LED lamp can convert the mains supply into the direct current ripple voltage, the LED is switched on to emit light only in a pulse high level receiving time interval but stops emitting light in a pulse low level receiving time interval, and therefore, the LED is in an on / off alternate state, fatigue, caused by long-time continuous working, of the LED, can be avoided, heat productivity is reduced, service life of the LED is prolonged greatly, and consumption of nonferrous materials for a radiator is reduced.

Description

technical field [0001] The invention relates to a power supply circuit, in particular to a power supply circuit of an LED lighting lamp. Background technique [0002] With the deepening of people's understanding of the concept of energy saving and environmental protection, and the encouragement of national policies, the application of LED light sources is constantly being promoted. LED lamps are mainly divided into higher-power flat-panel street lamps (above 30W) for outdoor use, LED fluorescent lamps and low-power LED bulbs (less than 15W) for household use. The luminous efficiency and service life of LED lighting lamps have a great relationship with their power supply circuits. The existing LED lighting lamps all adopt a stable DC power supply circuit, and try to stabilize the voltage and current as much as possible. Looking at the more famous LED companies now, including Beijing Famous LED lighting companies such as Opples, Shanghai Baolip, Zhejiang Chint, Wenzhou Focus...

AI Technical Summary

Problems solved by technology

The luminous efficiency and service life of LED lighting lamps have a great relationship with their power supply circuits. The existing LED lighting lamps all adopt a stable DC power supply circuit, and try to stabilize the voltage and current as much as possible. Looking at the more famous LED companies now, including Beijing Famous LED lighting companies such as Opples, Shanghai Baolip, Zhejiang Chint, Wenzhou Focus, Shenzhen Grimmy, and the world brand Philips are all using LED lamps driven by traditional DC circuits. The outdoor high-power LED street lights represented by Philips all use switching power supply as the drive circuit, while for low-power LED lights (not exceeding 15W), they are bulb-type and fluorescent lamp-type household LED lights represented by Philips. The capacitive current-limiting full-bridge rectifier DC power supply circuit, although the luminous intensity of the LED lamp designed in this way is very high, but the most fatal shortcoming is that it will make the lamp bead hot, and as long as the LED lamp bead is hot, the light decay will be greatly reduced. Speed ​​up, so it will obviously shorten the service life of LED, which is much shorter than the nominal service life (50,000 hours)

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