Circuit overload protection method and overcurrent protection device

An overload current and protection device technology, which is applied in the field of circuit overload protection and over-current protection devices, can solve the problems of non-ferrous metal consumption, lack of protection, and circuit failure, and achieve the effect of reducing consumption and simplifying operation

Inactive Publication Date: 2020-04-21
HELLA SHANGHAI ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of pulsed overcurrent does not pose a threat to many electrical systems, but it may cause the action of many overcurrent protection devices such as ordinary fuses and relays. Unnecessary frequent protection will make the circuit unable to work normally; if a larger size is used If the fuse is used, then it will not be protected whe...

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  • Circuit overload protection method and overcurrent protection device
  • Circuit overload protection method and overcurrent protection device
  • Circuit overload protection method and overcurrent protection device

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Embodiment Construction

[0031] The advantages of the present invention will be further elaborated below in conjunction with the accompanying drawings and specific embodiments.

[0032] The terminology used in the present disclosure is for the purpose of describing particular embodiments only, and is not intended to limit the present disclosure. As used in this disclosure and the appended claims, the singular forms "a", "the", and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise. It should also be understood that the term "and / or" as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0033] In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be mechanical connection or electrical connection, or two The internal co...

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Abstract

The invention provides a circuit overload protection method, which is applied to an electrical system and comprises the steps of S1, detecting a current value in an electrical system circuit; S2, performing sampling on a current value detection result in a preset time interval before the current moment for a preset number of times, wherein the time interval between two adjacent times of sampling is the same, calculating an effective current value in the preset time interval according to the sampling frequency and the current value obtained by each sampling, then comparing the effective currentvalue with a preset maximum allowable overload current value, and when the effective current value is greater than the preset maximum allowable overload current value, judging that the current in thecircuit at the current moment is overload current; and S3, when the current in the circuit at the current moment is the overload current, cutting off a power supply of the electrical system. The invention further provides an overcurrent protection device. After the technical scheme is adopted, the overcurrent protection device is not influenced by the environment temperature, the overload currentcan be judged, and the fuse does not need to be replaced.

Description

technical field [0001] The invention relates to the technical field of electrical systems, in particular to a circuit overload protection method and an overcurrent protection device. Background technique [0002] Usually, thermal relays or fuses are used in electrical systems for overload and short-circuit protection. This protection method has the advantages of simple circuit structure and easy implementation. However, this type of over-current protection device based on electrical hardware also has some problems in practical applications. [0003] First of all, fuse-type overcurrent protection devices are easily affected by ambient temperature during operation, resulting in protection failure or malfunction, and affecting the accuracy of setting the protection current value. On the one hand, changes in ambient temperature will affect the heat dissipation conditions of the relevant melt in the air. Under long-term overload conditions, the temperature rise curve of the melt ...

Claims

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Application Information

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IPC IPC(8): H02H3/08
CPCH02H3/08
Inventor 杨鹏乐成彦
Owner HELLA SHANGHAI ELECTRONICS
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