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Boost circuit and backlight light source

A technology of boost circuit and boost inductor, which is applied in the direction of electrical components, adjusting electric variables, instruments, etc., can solve problems such as the crossover loss of the main switch tube, reduce crossover loss, reduce backlight loss, and improve EMI electromagnetic interference Effect

Inactive Publication Date: 2016-12-21
SHENZHEN CHINA STAR OPTOELECTRONICS TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, in the prior art, when the main switch tube of the boost circuit is turned on, due to the high voltage at the main switch tube, there will be very serious crossover losses in the main switch tube.

Method used

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  • Boost circuit and backlight light source
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Embodiment Construction

[0021] The following descriptions of the various embodiments refer to the accompanying drawings to illustrate specific embodiments in which the present invention can be practiced. The directional terms mentioned in the present invention, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "side", etc., are for reference only The orientation of the attached schema. Therefore, the directional terms used are used to illustrate and understand the present invention, but not to limit the present invention.

[0022] In the figures, blocks with similar structures are denoted by the same reference numerals.

[0023] Please refer to figure 1 , in a preferred embodiment of the present invention, the boost circuit includes: an input module 101, a boost inductor 102, an output module 103, a first detection module 104, a control module 105, a first switch module 106 and a second Detection module 107.

[0024] Wherein, the input module 101, the boost inductor 102...

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Abstract

The invention provides a boost circuit and a backlight light source. The boost circuit comprises an input module, a boost inductor, an output module, a control module, a first switch module, a first detection module and a second detection module. The output module is connected to a light emitting module. The input end of the first switch module is connected to the common node of the boost inductor and the output module, and the output end of the first switch module is grounded. The control end of the first switch module is connected to the control module. The first detection module is connected to the control module and is used for detecting the oscillation state signal of the boost inductor. The second detection module is connected to the control module and the light emitting module and is used for detecting the information of current which flows through the light emitting module. The control module is used for switching the first switch module when a boost inductor is oscillated to a lowest point according to the oscillation state information detected by the first detection module. The boost circuit and the backlight light source have the advantages that the crossover loss is reduced, the backlight loss is reduced, and the EMI electromagnetic interference is improved.

Description

technical field [0001] The invention relates to the field of liquid crystal display, in particular to a voltage boosting circuit and a backlight light source. Background technique [0002] The current common TV backlight circuit is to boost the 24V input to the voltage required by the LED through the booster circuit. In the case of switching between heavy load and light load, the over-boost circuit will enter CCM mode (continuous mode) and DCM mode (discontinuous mode) accordingly. [0003] However, in the prior art, when the main switch tube of the boost circuit is turned on, since the voltage at the main switch tube is relatively high, there will be very serious crossover loss in the main switch tube. [0004] Therefore, there are defects in the prior art, and improvement is badly needed. Contents of the invention [0005] The purpose of the present invention is to provide an improved boost circuit and a backlight source. [0006] In order to solve the above problems,...

Claims

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Application Information

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IPC IPC(8): H02M3/156G09G3/34
CPCH02M3/156G09G3/3406
Inventor 李文东
Owner SHENZHEN CHINA STAR OPTOELECTRONICS TECH CO LTD
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