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Overvoltage protection circuit and electronic device with same

A technology for overvoltage protection circuits and electronic devices, which is applied in emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, circuit devices, etc., and can solve problems such as component damage and long time

Active Publication Date: 2013-09-11
TCL CHINA STAR OPTOELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the overvoltage protection voltage of the LED in the two-dimensional mode and the three-dimensional mode is the same, when the voltage of the LED in the two-dimensional mode reaches the overvoltage protection voltage, it has greatly exceeded the normal operating voltage, making the time from normal to trigger OVP will be longer, which may cause some components to be damaged

Method used

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  • Overvoltage protection circuit and electronic device with same
  • Overvoltage protection circuit and electronic device with same

Examples

Experimental program
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Embodiment Construction

[0017] see figure 1 , is a block diagram of the electronic device 100 (hereinafter referred to as the electronic device 100 ) with the overvoltage protection circuit of the present invention. The electronic device 100 includes a power supply 10 , an LED module 20 , an overvoltage protection circuit 30 and a 2D / 3D signal terminal 40 .

[0018] The LED module 20 includes a positive input terminal 201 and a controlled terminal 202 , and the control unit 31 includes a power supply terminal ISEN, a control terminal CP and an overvoltage protection terminal OVP.

[0019] The power supply 10 includes an output terminal Vin, the output terminal Vin of the power supply 10 is electrically connected to the positive input terminal 201 of the LED module 20 and the power supply terminal ISEN of the control unit 31, and the power supply 10 is used to provide power for the LED module 20 and the control unit 31 power supply. Wherein, the power source 10 can be a battery or a power adapter. ...

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Abstract

An overvoltage protection circuit is used for realizing overvoltage protection on an LED module of an electronic module and comprises a control unit, an overvoltage detecting circuit, a trigger module and an adjusting module. The LED module of the electronic device comprises a positive electrode input end. The overvoltage detecting circuit is used for generating detecting voltage proportional to voltage of the positive electrode input end. The control unit is used for controlling the LED module to work or idle according to a received detecting signal. The trigger module is used for receiving a two-dimensional or three-dimensional signal output by a 2D / 3D (two dimension / three dimension) signal end and generating a corresponding trigger signal. The adjusting module is used for correspondingly adjusting proportion between the detecting voltage generated by the overvoltage detecting module and the voltage of the positive electrode input end according to the trigger signal generated by the trigger module. The invention further provides the electronic device. By the electronic device and the overvoltage protection circuit, the LED module can be quickly in voltage protection when the electronic device is in two-dimensional mode.

Description

technical field [0001] The invention relates to a protection circuit, in particular to an overvoltage protection circuit and an electronic device with the overvoltage protection circuit. Background technique [0002] Currently, more and more electronic devices use LEDs (light-emitting diodes) as backlight modules. Current electronic devices such as televisions and computer monitors can often work in a two-dimensional mode (2DMode) or a three-dimensional mode (3D Mode). Currently, the overvoltage protection voltage of the LED is the same in the two-dimensional mode and the three-dimensional mode. However, when the electronic device works normally, since the current flowing through the LED in the two-dimensional mode is lower than that in the three-dimensional mode, the voltage of the LED in the two-dimensional mode is lower than that in the three-dimensional mode. Since the overvoltage protection voltage of the LED in the two-dimensional mode and the three-dimensional mode ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02H02H3/20
CPCH02H9/041H05B45/46H05B45/50H05B45/37Y02B20/30H05B47/24H02H1/0007H02H1/0061H02H9/045
Inventor 曹丹
Owner TCL CHINA STAR OPTOELECTRONICS TECH CO LTD