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Over-current protection circuit

A protection circuit and overcurrent technology, which is applied to emergency protection circuit devices, emergency protection circuit devices, and circuit devices used to limit overcurrent/overvoltage, and can solve the problem of large current, large electronic equipment failure, and incapable of large current Discharge and other issues, to achieve the effect of simple circuit structure, effective protection, and low cost

Inactive Publication Date: 2017-03-08
邱晓霞
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current of interference such as surges is extremely large, which will greatly damage the electronic equipment
However, the existing overcurrent protection circuit is only a parallel connection of large and small capacitors or series inductance, but in some cases, it cannot completely discharge the large current

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] An overcurrent protection circuit, characterized in that it includes a first field effect transistor, a second field effect transistor, a third field effect transistor, a silicon controlled rectifier, a voltage divider circuit, a third resistor, a fourth resistor, and a fifth resistor , a comparator and a triode, the drain of the first field effect transistor is connected to one end of the voltage divider circuit and one end of the third resistor and connected to the drain of the second field effect transistor, the fifth resistor and the second field effect transistor respectively through the fourth resistor and the fifth resistor The drain of the third field effect transistor is connected, the gate of the third field effect transistor is connected to its source and connected to the power supply at the same time, the other end of the voltage divider circuit is grounded, and the third resistor The other end of the resistor is connected to the base and collector of the tri...

Embodiment 2

[0015] This embodiment is refined on the basis of the above embodiments, that is, the voltage dividing circuit includes a first resistor and a second resistor, and the first resistor and the second resistor are connected in series.

[0016] Both the first field effect transistor and the third field effect transistor are P-type field effect transistors, and the second field effect transistor is an N-type field effect transistor.

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Abstract

The invention discloses an over-current protection circuit. A drain of a first field effect transistor is connected with one end of a voltage division circuit and one end of a third resistor and is connected with a drain of a second field effect transistor and the drain of a third field effect transistor through a fourth resistor and a fifth resistor separately; a grid of the third field effect transistor and a source of the third field effect transistor are connected with each other and are simultaneously connected to a power supply; the other end of the voltage division circuit is grounded and the other end of the third resistor is simultaneously connected with a base and a collector of a triode; an emitter of the triode is grounded; the other end of the fourth resistor is connected to a source of the first field effect transistor; the drain of the first field effect transistor is grounded; the grid is connected to an output end of a comparator, an input end of the comparator is connected with the collector of the triode and the other end is connected to the voltage division circuit; and one end of a silicon controlled rectifier is connected to the source of the third field effect transistor and the other end is connected to the grid of the second field effect transistor and grounded. The circuit structure is simple and protection on heavy current can be achieved.

Description

technical field [0001] The invention relates to the field of integrated circuits, in particular to an overcurrent protection circuit. Background technique [0002] During the use of electronic equipment, it will be subject to many external disturbances, such as surges. The surge mainly refers to the strong pulse generated at the moment when the power supply is just turned on. It is likely to cause the circuit to burn out at the moment of the surge, such as breakdown of the PN junction capacitance, blown resistance and so on. Interference currents such as surges are extremely large, which can greatly damage electronic equipment. However, the existing overcurrent protection circuit is only a parallel connection of large and small capacitors or series inductance, but in some cases, it cannot completely discharge the large current. Contents of the invention [0003] In order to solve the above technical problems, the present invention provides an overcurrent protection circu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/02
Inventor 邱晓霞
Owner 邱晓霞
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