Overcurrent protection circuit

A technology of overcurrent protection circuit and circuit, which is applied in the direction of protection that responds to overcurrent, and can solve problems such as inappropriate

Inactive Publication Date: 2006-10-18
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The overcurrent protection circuit in the above prior art can only set different overcurrent threshold values ​​by adjusting the reference voltage value provided by the reference voltage source 103, that is, when the overcurrent threshold value needs to be adjusted, only by modifying the reference voltage The reference voltage value provided by the source 103 can only be realized, so it is not suitable for applications that require frequent modification of the over-current threshold. The application that requires frequent modification of the over-current threshold refers to the occasion where the load changes frequently. Set different over-current thresholds for different loads; for example, when the maximum current that a load can allow is 1 ampere, the over-current threshold of the over-current protection circuit can be set to 1 ampere; when replacing a larger load, When the maximum current that it can allow to pass is 2 amperes, it is necessary to modify the overcurrent threshold of the overcurrent protection circuit to 2 amperes

Method used

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Embodiment Construction

[0029] The design purpose of the present invention is to provide an over-current protection circuit that can flexibly control and adjust the corresponding reference voltage value according to the different over-current thresholds that different loads can withstand, so as to be suitable for the over-current protection circuit caused by the need to change loads frequently. Applications that need to modify the overcurrent threshold frequently.

[0030] The specific implementation process of the overcurrent protection circuit of the present invention will be described in detail below in conjunction with each accompanying drawing, please refer to image 3 , this figure is a block diagram of the main components of the overcurrent protection circuit of the present invention. Its main components include four parts: a current sampling circuit 101, a voltage comparator 102, a control unit 1031 and a voltage output circuit 1032. The specific functions of each component And the effect is ...

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Abstract

A over current protective circuit consists of current sampling circuit connected to power supply and load for outputting the sampling voltage value of sampling current, control unit for confirming reference voltage value according to over current valve value, voltage output circuit connected to control unit for outputting reference voltage value confirmed by control unit and voltage comparator for comparing the sampling voltage value with reference voltage value and for being used to output over current signal to indicate power supply switch to switch power off when sampling voltage value is greater then reference voltage value.

Description

technical field [0001] The invention relates to the technical field of circuit design, in particular to an overcurrent protection circuit. Background technique [0002] In the field of traditional circuit technology, an overcurrent protection circuit is a circuit that can protect the entire circuit when the current flowing through it is too large. [0003] Please refer to figure 1 , this figure is a block diagram of the application principle of the existing overcurrent protection circuit; the main function of the overcurrent protection circuit 10 in the figure is to detect the output current of the power supply, and when it is detected that the current flowing through exceeds the specified current threshold, it will automatically shut down or cut off Turn on the power. [0004] Please refer to figure 2 , which is a block diagram of the circuit principle of the existing over-current protection circuit; the traditional over-current protection circuit is mainly composed of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/08
Inventor 陈建海冯东
Owner HUAWEI TECH CO LTD
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