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led ac drive circuit

A technology of AC drive and AC mains, applied in the direction of lamp circuit layout, electric light source, electrical components, etc., can solve the problems of power and brightness reduction, LED product brightness power increase, damage, etc., and achieve high utilization rate effect

Active Publication Date: 2016-09-28
四川能投智慧光电有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, if a 110V AC product is used in a 220V grid, the brightness and power of the LED product will increase or even be damaged; similarly, if a 220V product is used in a 110V grid, its power and brightness will decrease, or even not light up.

Method used

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Embodiment Construction

[0043] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in combination with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are exemplary only, and are not intended to limit the scope of the present invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concept of the present invention.

[0044] figure 1 A schematic structural diagram of a first-generation LED AC drive circuit in the prior art is shown. Such as figure 1 As shown, the main feature of the circuit is that the resistance is used to limit the current in the whole circuit, and the whole circuit structure is simple. The disadvantage of this circuit structure is that due to the current limiting of the resistor, a large amount of electric energy...

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Abstract

An LED AC drive circuit, comprising: a rectifying unit, a current limiting unit, and M LED units, each LED unit comprising ni LEDs connected in series, where 1≤i≤M, and n1+n2+...+nM=N , 1≤M≤N, and N is determined by the following formula: the M LED units are sequentially connected to the positive terminal of the rectification unit and the current limiting unit connected to the negative terminal of the rectification unit, wherein the first The LED unit includes a switch connected in series to the negative end of the LED string, the i-th LED unit includes a switch connected in series to the positive end of the LED string and a switch connected in series to the negative end of the LED string, 1≤i≤M‑1, and the Mth LED unit includes a switch connected in series to the negative end of the LED string. A switch at the positive end of the LED string; and M-1 disconnection or conduction control connection lines, wherein, by changing the opening and closing states of each switch and the disconnection or conduction state of the disconnection or conduction control connection lines , changing the series-parallel connection state of each LED unit, so that all LEDs work normally within each voltage range of the pulsating direct current.

Description

technical field [0001] The invention belongs to the technical field of LED drive circuits, and in particular relates to an LED AC drive circuit. Background technique [0002] At present, the awareness of energy saving and environmental protection has attracted more and more attention from all walks of life. In the field of lighting, it is shown that a large number of LED lighting products with unique energy-saving advantages are used. [0003] In the prior art, the driving circuit of LED lighting products usually adopts the traditional switching constant current power supply technology (AC-DC). The service life of these driving circuits is far lower than the service life of the LED itself, which leads to the fact that the actual service life of LED lighting products has no advantage over traditional energy-saving lamps. Therefore, people have proposed the first-generation LED AC drive technology that directly connects LEDs to AC mains power. This technology can solve the l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02H05B44/00
CPCH05B45/44H05B45/10H05B45/46H05B45/48
Inventor 杨冕封正勇龙文涛李东明
Owner 四川能投智慧光电有限公司
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