Three primary colors LED fast constant-current driving circuit
A technology of constant current drive and constant current control circuit, which is applied in the layout of electric lamp circuits, electric light sources, lighting devices, etc., can solve the problems of narrow brightness control range and slow current rising speed, and achieves wide brightness control range and current rising speed. The effect of fast, system cost reduction
Inactive Publication Date: 2008-05-21
SHENZHEN MEGMEET ELECTRICAL CO LTD
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However, the existing three-color LED light sources in TVs, as shown in Figure 1 and Figure 2, require three sets of constant current control and drive circuits, and due to the existence of capacitor C in the main circuit, the current rise speed is slow and the brightness control range is limited. narrow
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[0020] In order to facilitate a further understanding of the present invention, the present invention will now be described in detail in conjunction with the accompanying drawings and specific embodiments.
[0021] Fig. 3 is a schematic block diagram provided by the present invention, the core idea of which is: centralized power supply for three primary color LED light sources, and constant current control for R / G / B three groups of LED light sources by using a set of constant current power supplies.
[0022] Figure 4 is a schematic diagram of the circuit provided by the present invention, the circuit includes a constant current control circuit, an inductor L, a first switch S, a second switch R, a third switch G, a fourth switch B, a sampling resistor Rcs, a first group Light source LED1, second group of light source LED2, third group of light source LED3;
[0023] One end of the inductor L is connected to the power input VIN, the other end is connected to the drain of the f...
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The invention discloses a rapid and constant current drive circuit for LED in three primary colors, comprising a constant current control circuit, no less than three groups of LED light sources and corresponding switches and a group of constant current power supply. The constant current power supply comprises an inductance (L) and a first switch (S). The drain electrode of the first switch is connected with the power supply (VIN) via the inductance (L). The gate electrode is connected with the constant current control circuit and the source electrode is connected with the ground. Using a group of power supply to carry out the constant current control over three groups of LED light sources R / G / B, the invention has the advantages of greatly reducing the system cost, largely improving the efficiency and having a high current rising velocity and a wide luminance control range.
Description
technical field [0001] The invention relates to the field of electrical appliances, in particular to a fast constant-current drive circuit for three-primary-color LEDs. Background technique [0002] With the advancement of science and technology, TV has become an indispensable electrical appliance in every family, and people's demand for TV is also increasing. Various manufacturers are improving the performance of TV in various aspects and reducing the cost of TV. However, the existing three-color LED light sources in TVs, as shown in Figure 1 and Figure 2, require three sets of constant current control and drive circuits, and due to the existence of capacitor C in the main circuit, the current rises slowly and the brightness control range narrow. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a fast constant current drive circuit for three-primary-color LEDs. [0004] In order to solve the above technical pro...
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IPC IPC(8): H05B37/02
Inventor 沈楚春
Owner SHENZHEN MEGMEET ELECTRICAL CO LTD