Current control device for mutiple strings of led, and method thereof

A current control and current technology, applied in lighting devices, circuit layout, lamp circuit layout, etc., can solve the problems of high power consumption of the control chip, affect the performance of the control chip, and cannot work normally, and achieve the problem of less pins and heat problems. Solution, the effect of the overall structure is simple

Active Publication Date: 2011-04-13
CHENGDU MONOLITHIC POWER SYST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method will cause excessive power consumption of the control chip, and the resulting thermal problems will affect the performance of the control chip or fail to work normally

Method used

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  • Current control device for mutiple strings of led, and method thereof
  • Current control device for mutiple strings of led, and method thereof
  • Current control device for mutiple strings of led, and method thereof

Examples

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Embodiment Construction

[0019] The description in this part is only for a few typical embodiments, and the present invention is not limited to the scope of the description of the embodiments. The mutual replacement of the same or similar existing technical means and some technical features in the embodiments is also within the description and protection scope of the present invention.

[0020] The "based on" in the specification refers to the "based on" of individual embodiments, and in other embodiments, it may also be based on other content. "Coupling" includes direct connection and indirect connection, such as connection through some active devices, passive devices or conductive media. "Circuit" refers to a unit in which one or more elements (including active devices and passive devices) are coupled together to provide a certain function. "Signal" may refer to a current signal, a voltage signal, a charge signal, a temperature signal, data, or other signals. The signal can be generated by logic high...

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PUM

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Abstract

The present invention discloses a current control device used for multiple strings of LED, and a method thereof. The device comprises one to a plurality of first current limiting circuits. Each first current limiting circuit is connected with a load in series and is used for controlling the current of the load. The device furthermore comprises a detection and control circuit which outputs at least one driving signal for controlling one to a plurality of second current limiting circuits, wherein each second current limiting circuit is connected with one first current limiting circuit and a corresponding load in series.

Description

Technical field [0001] The present invention relates to light emitting diodes (LEDs), in particular to current control of multiple strings of LED loads. Background technique [0002] Light-emitting diodes (LEDs) are widely used in many occasions, such as to provide backlights for liquid crystal (LCD) televisions, liquid crystal displays, LED displays or other similar devices. In these occasions, a large number of LEDs are often used. In order to reduce the driving and control components, the configuration of multiple strings of LEDs is usually adopted, where each string of LEDs is a plurality of LEDs connected in series. Each string of LED light bars is controlled as a whole, so that driving and control components are reduced, and at the same time, separate control of each string of light bars can be realized. [0003] The current flowing through the LED light bar needs to be controlled to prevent excessive brightness, device damage or safety accidents. Existing current control m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02F21S2/00F21V23/00F21Y101/02
CPCH05B33/0827H05B45/46
Inventor 姚凯卫詹姆斯·莫耶
Owner CHENGDU MONOLITHIC POWER SYST
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