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Output over-voltage protection circuit and lamp with over-voltage protection function

A protection circuit and output overvoltage technology, applied in the direction of emergency protection circuit device, emergency protection circuit device, circuit device for limiting overcurrent/overvoltage, etc., can solve problems such as load damage, and achieve the effect of avoiding load damage

Inactive Publication Date: 2014-09-10
SHENZHEN OCEANS KING LIGHTING ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When the adjustable resistor has poor contact, the adjustable resistor is equivalent to an open circuit, which may cause the output voltage of the three-terminal adjustable voltage regulator device to reach the limit value, and the load will be damaged due to high voltage.

Method used

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  • Output over-voltage protection circuit and lamp with over-voltage protection function
  • Output over-voltage protection circuit and lamp with over-voltage protection function
  • Output over-voltage protection circuit and lamp with over-voltage protection function

Examples

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Embodiment Construction

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0031] Please refer to figure 1 , figure 1 Is a circuit diagram of an output overvoltage protection circuit provided by an embodiment of the present invention, such as figure 1 As shown, the output overvoltage protection circuit includes:

[0032] The voltage stabilizer 101, the switch 102 and the sampler 103, wherein the voltage stabilizer 101 includes a voltage regulation terminal ADJUST, when the absolute value of the voltage of the volt...

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Abstract

The embodiment of the invention discloses an output over-voltage protection circuit and a lamp with an over-voltage protection function. The circuit comprises a voltage regulator, a switch and a sampler. The voltage regulator has a voltage regulation end. The absolute value of voltage at the output end of the voltage regulator decreases when the absolute value of voltage at the voltage regulation end decreases. The grounding end of the voltage regulator is connected to a grounding point, the input end of the voltage regulator is used for being connected to a power supply, and the output end of the voltage regulator is used for being connected to a load of the output over-voltage protection circuit. A first end of the switch is connected to the voltage regulation end, a second end of the switch is connected to the grounding point, and a driving end of the switch is connected to the output end of the sampler. The sampler is used for sampling voltage at the output end of the voltage regulator, and outputting a driving signal to cause the switch to be switched on so as to reduce the absolute value of the voltage at the voltage regulation end when the sampled voltage at the output end of the voltage regulator exceeds a voltage limit value. According to the invention, the situation in which output over-voltage causes damage to the load can be avoided.

Description

Technical field [0001] The invention relates to the field of electronic circuits, in particular to an output overcurrent protection circuit and a lamp with overcurrent protection function. Background technique [0002] Three-terminal adjustable voltage regulator device is a kind of output programmable voltage regulator, including three-terminal adjustable output positive voltage regulator device and three-terminal adjustable output negative voltage regulator device. Its output voltage range is large and easy to use, so Three-terminal adjustable voltage stabilizing devices are widely used in electronic circuits to provide a variety of DC voltages for various DC loads. In a typical application circuit of a three-terminal adjustable voltage regulator device, the output voltage can be set by two external resistors. In order to facilitate the adjustment of the output voltage of the three-terminal adjustable voltage regulator device, there is usually one of the two external resistors i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/04
Inventor 周明杰管伟芳
Owner SHENZHEN OCEANS KING LIGHTING ENG CO LTD
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