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Multi-path-output low-voltage-difference over-current protector

An overcurrent protector and multi-output technology, which is applied to emergency protection circuit devices, emergency protection devices with automatic disconnection, circuit devices, etc., can solve the problem of one input and multiple independent outputs not affecting each other, and achieve adaptability wide effect

Pending Publication Date: 2018-08-07
扬州海通电子科技有限公司
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that one input and multiple independent outputs do not affect each other, the present invention provides a multi-output low dropout overcurrent protector to solve the above problems

Method used

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Embodiment Construction

[0029] The present invention is described in further detail now in conjunction with accompanying drawing. These drawings are all simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, so they only show the configurations related to the present invention.

[0030] Such as Figure 2-6 As shown, a multi-channel output low-dropout overcurrent protector of the present invention includes an input interface 1, a fault reset and reporting circuit 3, a fault reporting interface 4, a parallel multi-channel low-dropout overcurrent protection module and is used for each channel Auxiliary power supply 2 for supplying power to various parts of the circuit on the low dropout overcurrent protection module.

[0031] Input interface 1: From the public DC power supply to the protection device, some interference will be introduced due to the long input line, so a high-frequency ceramic capacitor and a low-frequency aluminum electr...

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PUM

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Abstract

The invention relates to a multi-path-output low-voltage-difference over-current protector comprising an input interface, an auxiliary power supply, a fault resetting and reporting circuit, a fault reporting interface, a differential current sampling circuit, an electronic switch, an error amplifier, a differential voltage comparator, and an output interface and the like. According to the invention, a P channel power MOS tube is used as an electronic switch; a low-voltage-difference shunt is used for carrying out sampling of a small current signal and then a differential amplifier is used foramplifying the small current signal; and the amplified signal and a current reference are sent to the error amplifier to carry out error amplification to control the opening degree of the power MOS tube. A constant-current state is realized under the condition of being larger than a rated current reference; and complete opening is carried out under the condition of being lower than the rated current reference. The differential voltage comparator is used for comparison between the voltage difference of the power MOS tube and the voltage reference to determine whether a fault exits.

Description

technical field [0001] The invention belongs to an overcurrent protection device, in particular to a multi-channel output low-voltage differential overcurrent protector. Background technique [0002] The existing one-input-multiple-output protection scheme is to connect multiple fuses after one common input to realize the multi-channel protection function. Such as figure 1 As shown, its disadvantages are: long time of fuse fusing, large fusing current, large difference of fusing point with the change of ambient temperature, overcurrent or short circuit of one path may cause no output of other paths (if the rated output current of this path is large and close to the rated input current , at this time a short circuit will cause no output from other channels). Contents of the invention [0003] In order to solve the problem that one input and multiple independent outputs do not affect each other, the present invention provides a multi-output low dropout overcurrent protecto...

Claims

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Application Information

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IPC IPC(8): H02H3/087
CPCH02H3/087
Inventor 谢文武
Owner 扬州海通电子科技有限公司
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