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High-output-power low-frequency-flash alternating-current direct-connection LED driving chip and device

A technology of LED driving and high output power, applied in electrical components and other directions, can solve the problem of low stroboscopic output power, and achieve the effect of reducing the stroboscopic percentage, increasing the amplitude, and increasing the output power.

Inactive Publication Date: 2021-01-12
ZHEJIANG UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] In order to solve the problems of obvious stroboscopic and low output power encountered in the application of AC direct-connected LED driver ICs in the field of street lamps, the present invention provides an AC direct-connected LED driver chip and device with high output power and low stroboscopic flicker

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  • High-output-power low-frequency-flash alternating-current direct-connection LED driving chip and device
  • High-output-power low-frequency-flash alternating-current direct-connection LED driving chip and device
  • High-output-power low-frequency-flash alternating-current direct-connection LED driving chip and device

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Embodiment Construction

[0054] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0055] figure 1 It is a schematic diagram of the input voltage and output current of the AC direct-connected LED driver IC driven by 220V AC with time. It can be seen from the figure that the frequency of the output power is 100Hz. Due to the sequential conduction characteristics of the AC direct-connected LED driver IC, the current flowing through the LED light string presents a step-like change. And, when the transient value of the input voltage does not reach the LED 1 When the conduction voltage of the light string drops, all the LED light strings are turned off at the same time, and the current flowing through the LED light string is zero, that is, the power consumed by the LED light string is zero, and the corresponding flicker percentage is as high as 100%, which is much greater than the low risk Maximum blink percentage.

[0056] For...

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Abstract

The invention discloses a high-output-power low-frequency-flash alternating-current direct-connection LED driving chip and device. In the device, 380V three-phase alternating current is adopted to supply power to the alternating current direct connection LED driving ICs, three phases in the 380V three-phase alternating current are respectively matched with the three 380V alternating current directconnection LED driving ICs to drive the three groups of same LED lamp strings, and the frequency of the output power of the alternating current direct connection LED driving ICs is increased to 300Hzthrough a superposition mode by utilizing the phase characteristics of the 380V three-phase alternating current. The frequency-flash percentage is reduced by 87% or above, harm of frequency flash tohuman health is greatly reduced, due to increase of the input voltage phase number and increase of the amplitude, compared with an alternating-current direct-connection LED driving IC driven by 220V single-phase alternating current, the output power of the driving IC can be improved by about 5 times, application of the alternating-current direct-connection LED driving IC to the field of street lamps is better facilitated, balance of a power grid load is facilitated and maintenance of the device is convenient.

Description

technical field [0001] The invention relates to the technical field of AC direct-connected LED drive technology, in particular to the field of reducing the stroboscopic effect of an AC direct-connected LED driver IC and improving the output power in the field of street lamps. Background technique [0002] As the fourth-generation green light source, light-emitting diode (LED), compared with traditional lighting fixtures, has the advantages of high brightness, high efficiency, good stability, long life, safety, and environmental protection, and is widely used in the field of lighting. [0003] To ensure the normal light of the LED, an LED driver IC must be used. In the traditional constant current LED driver IC, in order to make the ripple of the driving current smaller, it is unavoidable to use an electrolytic capacitor with a larger capacity. The average life of the electrolytic capacitor is only about 5000 hours, which is far less than the life of the LED, thus limiting t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B45/345
CPCH05B45/345
Inventor 韩雁孙龙天
Owner ZHEJIANG UNIV
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