LED constant-current control circuit and LED liquid crystal television

A constant current control circuit and constant current control technology, applied in the field of circuits, can solve problems such as difficult debugging, high price, and many components, and achieve the effects of reduced development difficulty, cheap price, and reduced use

Active Publication Date: 2012-12-19
SHENZHEN SKYWORTH RGB ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a LED constant current control circuit, which aims to solve the problems in the existing LED constant cur

Method used

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  • LED constant-current control circuit and LED liquid crystal television
  • LED constant-current control circuit and LED liquid crystal television
  • LED constant-current control circuit and LED liquid crystal television

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Embodiment 1

[0026] figure 2 The circuit structure of the LED constant current control circuit 200 provided by the first embodiment of the present invention is shown. For the convenience of description, only the parts related to the first embodiment of the present invention are shown, and the details are as follows:

[0027] As an embodiment of the present invention, the constant current control module 2001 includes: a voltage dividing resistor R1, a current limiting resistor R2, a current limiting resistor R3, a diode D11, a Zener diode ZD1 and an NPN transistor Q1.

[0028] The first terminal of the voltage dividing resistor R1 is the control terminal of the constant current control module 2001, the collector of the NPN transistor Q1 is the input terminal of the constant current control module 2001, the second terminal of the voltage dividing resistor R1 is connected to the base of the NPN transistor Q1 The base of the NPN transistor Q1 is the adjustment terminal of the constant current...

Embodiment 2

[0039] Figure 4 The circuit structure of the LED constant current control circuit 200 provided by the second embodiment of the present invention is shown. For the convenience of description, only the parts related to the second embodiment of the present invention are shown, and the details are as follows:

[0040] As an embodiment of the present invention, the constant current control module 2001 includes: a voltage dividing resistor R6, a current limiting resistor R7, a current limiting resistor R8, a diode D2, a Zener diode ZD3 and an N-type MOS transistor Q3;

[0041]The first end of the voltage dividing resistor R6 is the control end of the constant current control module 2001, the drain of the N-type MOS transistor Q3 is the input end of the constant current control module 2001, the second end of the voltage dividing resistor R6 is connected to the N-type MOS transistor Q3 The gates are connected, the gate of the N-type MOS transistor Q3 is the adjustment terminal of the...

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Abstract

The invention belongs to the field of circuits, and provides an LED constant-current control circuit and an LED liquid crystal television. The LED constant-current control circuit consists of split elements including a switching tube, a voltage regulator tube, a functional resistor and a capacitor which are combined and connected, the switching tube has different high and low level states, so that LED load has different work states, use quantity of the elements is reduced, and the circuit is simple and cheap and is easy to debug, low in development difficulty and lowered in cost.

Description

technical field [0001] The invention belongs to the field of circuits, in particular to an LED constant current control circuit and an LED liquid crystal television. Background technique [0002] The development of white light sources plays an important role in greatly reducing lighting power consumption. It will reduce the growth rate of power consumption, thereby reducing the cost of grid capacity, especially white light LEDs. [0003] The current LED constant current drive control circuit is generally composed of a chip control method and a peripheral Boost circuit. This circuit structure has many components, complex circuits, difficult debugging, high development difficulty and high price, and difficult cost control. question. Contents of the invention [0004] The purpose of the present invention is to provide an LED constant current control circuit, aiming to solve the problems in the existing LED constant current drive control circuit, such as many components, comp...

Claims

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Application Information

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IPC IPC(8): H05B37/02H02H9/04H02H3/08
Inventor 李亚伟赵非凡巢铁牛戴奇峰
Owner SHENZHEN SKYWORTH RGB ELECTRONICS CO LTD
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