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Input current limit circuit and its light source drive device

A technology of input current and limiting circuit, applied in the direction of electric light source, light source, lighting device, etc., can solve the problem that it is difficult to generate 5.0A large and small current

Inactive Publication Date: 2008-01-09
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the front-stage circuit of the converter is usually an AC / DC conversion circuit, and it is difficult to generate a current of 5.0A

Method used

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  • Input current limit circuit and its light source drive device
  • Input current limit circuit and its light source drive device
  • Input current limit circuit and its light source drive device

Examples

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Embodiment Construction

[0014] FIG. 1A is an application environment diagram of an input current limiting circuit in an embodiment of the present invention. In this embodiment, the application environment diagram shown in FIG. 1A is a block diagram of a light source driving device. The light source driving device includes an input current limiting circuit 10 , an electronic device 11 and a light source module 12 . Wherein, the input terminal Vin of the light source driving device has a positive terminal and a negative terminal.

[0015] The input current limiting circuit 10 is connected to the input terminal Vin for adjusting the input current within a specified range, and includes an input current detection circuit 100 , an input voltage detection circuit 102 and a feedback compensation circuit 103 . In this embodiment, the electronic device 11 is an inverter, which is connected between the input current limiting circuit 10 and the light source module 12, and is used to drive the light source module...

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Abstract

The input current limiting circuit is connected to the feedback circuit in the electronic device and is used for limiting the current in the electronic device in a rated range. It comprises an input current detection circuit and a feedback compensation circuit; wherein, the input current detection circuit is used for the size of the input current; the feedback compensation circuit is connected to the portion between the current detection circuit and the feedback circuit and is used for outputting a compensation signal to the feedback circuit according to the detected current signals.

Description

technical field [0001] The invention relates to a current protection device, in particular to an input current limiting circuit. Background technique [0002] A liquid crystal display (Liquid Crystal Display, LCD) panel uses a discharge lamp (Discharge Lamp) as a light source for a backlight (Backlight) module. Typically, the discharge lamp is driven by an inverter. Generally, a discharge lamp requires a relatively high voltage to be ignited, which is much higher than the voltage required in a steady state of the discharge lamp. Therefore, when the discharge lamp is lit and the steady state is not reached, the input current of the converter is relatively large and exceeds the specified range. For example: The specified range of the input current of the converter is generally 4.0A to 4.6A. However, at the initial lighting moment of the discharge lamp, the input current reaches 5.0A. Therefore, in the production test of the converter, the production yield of the converter ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B41/285
Inventor 王家鹏刘益成葛炽昌
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD