AC LED lighting systems and control methods without flickering

A technology of light-emitting diodes and lighting systems, applied in the field of light-emitting diode lighting systems and control, can solve problems such as feeling uncomfortable

Active Publication Date: 2017-06-09
ANALOG INTEGRATIONS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even though the strobe may not be perceptible to the human eye, there have been reports of people feeling dizzy or feeling sick when viewing objects illuminated by LED lighting systems 15

Method used

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  • AC LED lighting systems and control methods without flickering
  • AC LED lighting systems and control methods without flickering
  • AC LED lighting systems and control methods without flickering

Examples

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Embodiment Construction

[0070] The embodiments of the invention disclosed below are sufficiently disclosed to enable those skilled in the art to which the invention pertains to practice the invention. Various simple combinations and changes made to the various embodiments disclosed in the present invention should still be regarded as embodiments of the present invention.

[0071] In the following specification, specific examples of various embodiments of the invention will be disclosed. However, these special examples are not the only way to implement the present invention. In order to make the description of the present invention concise and easy to understand, some embodiments that can be easily transferred by those skilled in the art of the present invention will not be repeated.

[0072] Please refer to Figure 4 , Figure 4 It is a circuit diagram of an AC LED lighting system 100 according to an embodiment of the present invention. The AC LED lighting system 100 has a full-wave rectifier 18 f...

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PUM

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Abstract

A LED lighting system performs no flicking. A rectifier receives an AC input voltage to generate a rectified input voltage at an input power line and a ground voltage at a ground line. A LED string comprises LEDs connected in series to have a main anode and a main cathode. The main anode is coupled to the input power line. A power bank is connected to the input power line and the main cathode. The circuit conducts a first driving current from the main cathode to the ground line, and a second driving current from the power bank to the ground line. The second driving current increases electric energy stored in the power bank. Both the first and second driving currents flow through the LED string. The power bank releases the electric energy to make at least one of the LEDs illuminate when the AC input voltage is about 0V.

Description

technical field [0001] The present invention relates to a light-emitting diode (Light-Emitting Diode; LED) lighting system, in particular to a light-emitting diode lighting system and a control method driven by alternating current without causing flicker. Background technique [0002] Light-emitting diodes (Light-Emitting Diodes; LEDs) are being used for general lighting purposes at a very fast speed. In one use case, an assembly consisting of multiple LEDs is powered by an AC power source, and the term "AC LED" is sometimes used to describe such a circuit. For the AC LED lighting system, the concerned parts include its manufacturing cost, power efficiency, power factor, flicker and service life...etc. [0003] Please refer to figure 1 , figure 1 It is a circuit diagram of an AC LED lighting system 10 in the prior art. The AC LED lighting system 10 simply includes a LED module 12 and a current limiting resistor 14 . The LED module 12 is composed of two anti-parallel LED...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/48H05B45/10H05B45/345
Inventor 王俊棋
Owner ANALOG INTEGRATIONS CORP
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