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Over current protection circuit

A technology for protecting circuits and overcurrent, applied to emergency protection circuit devices, emergency protection circuit devices, and circuit devices for limiting overcurrent/overvoltage, which can solve problems such as protection problems and power unit damage, and achieve cost savings Low cost, reliable circuit performance and practical effect

Active Publication Date: 2013-02-13
NANJING APAITEK TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the development of electronic technology, circuit protection is developing towards comprehensiveness and complexity. Various protection chips have come out one after another. There are many protection functions, such as over-temperature, over-current, over-voltage, under-voltage, short-circuit, etc., but for power As far as the module is concerned, if all the protections are put on one chip, once there is a problem with the chip, it will bring serious consequences, causing all the protections to go wrong, and the expensive power unit may be damaged, so it should be The protection of several important units is independent, so that once a problem occurs, the others can temporarily play a certain protective role, so as not to cause such a large risk

Method used

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  • Over current protection circuit

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Embodiment Construction

[0010] Below in conjunction with accompanying drawing, technical content of the present invention is described:

[0011] Such as figure 1 As shown, a current protection circuit of the present invention includes 3 resistors and 2 NPN transistors. The base of the transistor T1 is connected in series with a resistor R1 and connected to one end of the load and the collector of the transistor T2. The collector of the transistor T1 Connect the other end of the load and the positive pole of the power supply through a resistor R2, the collector of the transistor T1 is also connected to the base of the transistor T2 through a resistor R3, and the emitters of the transistor T1 and the transistor T2 are connected to the negative pole of the power supply; when the circuit requires When the working power supply of the protected IGBT is 3W, the limit working current is 0.2A, and the actual voltage is 16V, the value of resistor R1 is 10K, the value of R2 is 1K, the value of R3 is 4.7K, and t...

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PUM

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Abstract

The invention discloses an over current protection circuit, which has reliable, practical, simple and effective property. The over current protection circuit of the invention comprises 3 resisters and 2 PNP triodes, wherein, a base of a triode T1 is connected with a resister R1 in series and then is connected with one end of a load and a collector of a triode T2,a collector of the triode T1 is connected with the other end of the load and the positive pole of a power supply through a resister R2, the collector of the triode T1 is also connected with a base of the triode T2 through a resister R3, and the emitters of the triode T1 and the triode T2 are both connected with the negative pole of the power supply.

Description

technical field [0001] The invention relates to a circuit, more specifically to an overcurrent protection circuit, belonging to the field of power electronics. Background technique [0002] With the development of electronic technology, circuit protection is developing towards comprehensiveness and complexity. Various protection chips have come out one after another. There are many protection functions, such as over-temperature, over-current, over-voltage, under-voltage, short-circuit, etc., but for power As far as the module is concerned, if all the protections are put on one chip, once there is a problem with the chip, it will bring serious consequences, causing all the protections to go wrong, and the expensive power unit may be damaged, so it should be The protection of several important units is independent, so that once a problem occurs, the others can temporarily play a certain protective role, so as not to cause such a large risk. For example, the driving power in t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/02
Inventor 石泉
Owner NANJING APAITEK TECH
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