LED driving circuit based on bridgeless power factor correction (PFC)
A technology of LED driver and LED module, applied in electric light sources, electrical components, electroluminescent light sources, etc., can solve problems such as complex structures and achieve the effect of current balance
Inactive Publication Date: 2017-06-20
GUANGDONG UNIV OF TECH
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Problems solved by technology
Unfortunately, these drive circuits have complex structures and most of them need to use DC power as input
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[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0027] Please refer to figure 1 , figure 2 , image 3 , Figure 4 and Figure 5 , figure 1 A schematic structural diagram of a bridgeless PFC-based LED drive circuit provided by an embodiment of the present invention; figure 2 It is a schematic diagram of the working state of a bridgeless PFC-based LED drive circuit when the input vol...
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The invention discloses an LED driving circuit based on bridgeless power factor correction (PFC). The LED driving circuit comprises an AC power supply, a bidirectional full-control switch, a transformer, a current sharing capacitor, a first diode, a second diode, a third diode, a fourth diode, a first filter capacitor and a second filter capacitor. Energy provided for an LED module by the AC power supply through the driving circuit can be adjusted by adjusting a conduction duty ratio of the bidirectional full-control switch, and the function of adjusting LED brightness is achieved; a power factor of the AC power supply can also be adjusted by controlling the conduction duty ratio of the bidirectional full-control switch; the average values of currents passing through the LED module are equal within a voltage period of the AC power supply according to the fact that the current integration flowing into the current sharing capacitor and the current integration flowing out of the current sharing capacitor are balanced, and thus, the current balancing function of the LED driving circuit is achieved; and meanwhile, the LED driving circuit also has the advantages of simple structure and low cost, and market promotion is convenient.
Description
technical field [0001] The invention relates to the technical field of LED driving, in particular to a bridgeless PFC-based LED driving circuit. Background technique [0002] With the development of science and technology in modern society, LED lights have become the main lighting products in the current market due to their advantages such as high efficiency and long life. In view of the limited luminous ability of a single LED module and the limitations of thermal management and other factors, an LED system usually contains multiple LED modules. In order to ensure that each LED module emits the same brightness, the driving circuit needs to have the function of ensuring the current consistency of all LED modules. The simplest current sharing solution is to connect all LED monomers in series to share a current, but this will reduce the reliability of the system. [0003] In the prior art, scholars at home and abroad have designed various LED driving circuits through various...
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IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/10
Inventor 叶远茂章云陈思哲张桂东
Owner GUANGDONG UNIV OF TECH