Overvoltage and overcurrent protecting circuit

A technology of overvoltage and overcurrent protection and circuit, which is applied in the direction of emergency protection circuit device, protection against overvoltage, and protection against overcurrent. Problems such as self-recovery, terminal failure to return to normal work, etc.
CN104659732AActive Publication Date: 2015-05-27SHANGHAI XIETONG TECH
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
SHANGHAI XIETONG TECH
Publication Date
2015-05-27

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Abstract

The present invention discloses an overvoltage and overcurrent protecting circuit connected between a power source and a load, which includes: a resettable fuse, a first end of which is electrically connected to an output end of the power source; a switch circuit, a first conduction end of which is electrically connected to a second end of the resettable fuse, and a second conduction end of which is electrically connected to the load; an overvoltage circuit, for detecting whether an output voltage of the power source is overvoltage; an overcurrent detecting circuit, for detecting whether a current flowing through the resettable fuse is overcurrent; and a switch control circuit, a first input end of which is electrically connected to an output end of the overvoltage detecting circuit, and a second input end is electrically connected to an output end of the overcurrent detecting circuit, to control the electrical connection between the output end and the control end of the switch circuit, so as to control disconnection of the switch circuit when the overvoltage and / or overcurrent is detected, and automatically control the conduction of the switch circuit after a preset time period for disconnection is reached. The circuit of the present invention can protect the overvoltage and overcurrent at the same time, and can recover normal operations of the load after the fault state is vanished.
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Description

technical field

[0001] The invention relates to a protection circuit, in particular to an overvoltage and overcurrent protection circuit. Background technique

[0002] Power load management terminals have been widely used in the field of power automation. Power load management terminals are usually installed in various factories and mines. In practical applications, the main control station of the power company sends various commands to the power load management terminals located in various factories and mines through its omnidirectional antenna, and the power load management terminal Extract the data from the response code.

[0003] Power load management terminals need to withstand various electromagnetic interference from transformers and power grids, so electromagnetic compatibility measures have been taken to protect the terminals from being disturbed and still work normally. One of the serious interference situations is that the interference affects the terminal power...

Claims

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